JP2003306723A - Method for producing sintered ore for blast furnace - Google Patents

Abstract

(57) [Summary] [Problem] A sintered ore for a blast furnace that maintains the quality level of the sintered ore and does not reduce the yield and productivity of the sintered ore even when a large amount of high crystalline water ore is used. Development of manufacturing method. SOLUTION: A high crystal water ore 4 is classified by a sieving device 5, and a coarse portion 6 causing a disadvantageous behavior phenomenon in a sintering operation in a sintering process is separately dehydrated by a heating device 8 in advance. A method of removing the disadvantages and then providing the mixed raw material 13 or using it as a floor of a sintering machine 19 pallet, in which the water of crystallization is dehydrated, and the mine is discharged from the pallet in a normal sintering machine operation. Either the method of treating according to the method or the method of charging the blast furnace raw material ore 24 as a part of the lump ore into the blast furnace 23 is adopted, while the fine-grained portion 7 obtained by the classification is dehydrated ore. 9 or a mixed raw material mixed with the ordinary ore 1 or a mixed raw material mixed with the ordinary ore 1 to prevent the occurrence of adverse behavioral phenomena in the firing process of the coarse-grained high-crystal water ore.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention uses a high crystal water ore as a raw material for sinter ore used in a blast furnace ironmaking method,
The present invention also relates to a method for producing a sintered ore that realizes stable sintering operation.

[0002]

2. Description of the Related Art Sintered ore used as a raw material for a blast furnace is
Generally, it is manufactured by the following method.

First, iron ore powder of about 10 mm or less unloaded from the ship is piled up in a powder ore yard for each brand. A pile of various powdered ores, CaO-containing auxiliary raw material, SiO ₂ -containing auxiliary raw material, dust and the like are mixed by a bedding method at a preset ratio to obtain a blending powder. The blending powder (B powder), limestone and / or quick lime, flux such as silica stone and / or serpentine, solid fuel such as powder coke and / or anthracite as carbonaceous material, and return ore, and further, if necessary, blending Put each raw material such as plain powdered ore into a different raw material mixing tank, cut out a predetermined amount of each raw material continuously from each raw material mixing tank, mix, and add an appropriate amount of water to the mixed raw material Then, they are mixed and granulated into pseudo particles.

The sintered ore raw material granulated in this way is
A hopper is continuously fed through a charging system onto a pallet of a mobile sinter (Dwightroid sinter) having a grate to form a packed bed of sinter raw material. The raw material layer has a thickness of, for example, about 500 to 700 mm.
Next, the carbonaceous material of the raw material layer is ignited in an ignition furnace, the gas passing through the raw material layer is directed downward through the wind box at the bottom of the pallet, and the carbonaceous material is combusted while forcibly sucking air,
The combustion heat generated at this time melts and sinters the sintered ore raw material to agglomerate. The "sintered cake" thus fired is crushed, cooled, and then sized, and among the particles having a size of 3 to 5 mm or more, those satisfying the quality standard are charged into the blast furnace as "product sinter". The powder sinter having a diameter of 3 to 5 mm or less generated in the crushing and sizing process is used again as a raw material for sintering as return ore.

The quality of the sinter produced as a raw material for the blast furnace thus manufactured has a great influence on the stability of the unloading state during the operation of the blast furnace, the ventilation / liquid permeability, the reduction efficiency and the high temperature property. Exert. Therefore, high quality is required for the sinter, strict quality control is performed, and improvement of the product yield of the sinter is required in order to reduce the manufacturing cost. Here, the product yield of the sinter is represented by the ratio of the “product sinter” weight to the weight of the sinter cake, ie, product sinter / sinter cake. Further, in order to increase or secure the production amount of hot metal in the blast furnace, it is required to stably secure the productivity of the sintered ore as the main raw material of the blast furnace.

On the other hand, recently, in terms of the supply of iron ore, particularly high-quality iron ores such as hematite (Fe ₂ O ₃ , hematite) and magnetite (Fe ₃ O ₄ , magnetite) are decreasing. Accompanied by goethite, limonite (Fe ₂ O ₃ · n
There is an increase in so-called high crystal water ores, which are ores having a relatively high crystal water content such as pisolite ores containing a large amount of H ₂ O) and relatively coarse grains. The highest content of crystal water in the ore is 8
It reaches about 10 mass%. In the future, it is expected that a large amount of raw materials having a relatively small grain size and a crystal water content of 4 to 6 mass% will be received from Australia. There has been a strong demand for a technique for stably using a large amount of such highly crystallized water ore as a raw material for producing a sintered ore for a blast furnace.

However, the above-mentioned highly crystallized water ore has the following problems when it is used as a raw material for producing a sintered ore.
That is, if a high crystal water ore is blended in the production of sinter, coarse air hole cracks will occur during the dehydration of water in the process of water decomposition / separation from the iron ore in the sintering process, and a porous property will be added. To be done. Next, in a high temperature region of about 1200 ° C., CaO and hematite Fe ₂ in the sintering raw material are
When O ₃ Calcium ferrite produced by the reaction of (CaO-2Fe ₂ O ₃₎ KeiTorueki enters the said pores and cracks, the iron oxide particles of the iron ore is quickly separated,
Part of it melts into this melt to cause assimilation, and since the melt penetrates quickly, the melt remains in the pores and cracks. Thus, the sinter after cooling has a structure in which hematite particles that form a solid solution of alumina, a binder phase in which amorphous silicate or calcium / ferrite is mixed, a large amount of coarse air holes and cracks are mixed.

The presence of such secondary hematite particles that form a solid solution of alumina and a large amount of coarse air holes deteriorates the reduction powdering resistance of the sinter, and the presence of a large amount of coarse air holes causes the sinter to become cold. Strength and yield are reduced. Furthermore,
Due to the rapid assimilation, an over-melted portion is formed, and the air permeability in the vicinity thereof deteriorates during the sintering process. Further, as the air permeability deteriorates, the unsintered portion remains, forming a brittle portion. This has led to a decrease in yield, an increase in the amount of returned ore, and a decrease in the production rate.

When a large amount of high crystal water ore is used,
The above-mentioned problem becomes remarkable. On the other hand, even if a large amount of high crystal water ore is used, the quality of the sintered ore is not deteriorated, and the method for producing the sintered ore while maintaining the yield and productivity of the sintered ore is described below. Is proposed.

[0010] For example, Japanese Patent Publication No. 5-83620
Has proposed the following technology. Coarse grained high crystal water ore
Highly crystalline water ore powder and MgO-SiO containing, such as serpentine
₂Auxiliary raw material powder and an appropriate amount of solid carbon powder such as fine coke
A pre-granulated product having a coating layer made of is prepared. In the nucleus
This pre-granulated product mainly consisting of a high crystal water ore
The rest of the raw materials (This is a high CaO
/ SiO₂It becomes a raw material) and mixed with
Prepare pseudo particles by attaching to the surface. Like this
The outer layer portion of the above-mentioned pseudo particle is configured by
High CaO / SiO ₂Smell around 1200 ℃ from raw materials
CaO-Fe₂O₃A system melt is produced. This CaO-F
e₂O₃The system melt constitutes the coating layer of the surface layer of the preliminary granulated product.
MgO / SiO containing₂When it reacts with the system auxiliary material, this melt
Since the melting point of the melt increases and the fluidity decreases, the melt
It is difficult for the granulated material to enter inside. Thus, the sintering process
Coarse Grained Highly Crystalline Water Ore and CaO-Fe Above₂O₃System fusion
Suppresses contact with liquid and forms nuclei at high temperatures in between
The densification of the texture of the coarse-grained high-crystal water ore causes the burning of powder coke
Promoted by calcination, the assimilation reaction of high crystal water ore by the melt
Block the response. In this way, the large amount of rough air described above
Prevents deterioration of reduction powder resistance due to generation of pores, and
Improves the yield of the product sintered ore by ensuring air permeability in the bed
And to maintain the productivity of sinter (see below)
Below, it is referred to as Prior Art 1). However, in this method, assimilation M
Since gO-containing flux is used, carbonaceous material is used during sintering operation.
The problem is that the unit increases and the iron content in the sintered ore decreases.

Further, Japanese Patent Publication No. 6-29469 discloses that
There is disclosed a method of using a highly crystalline water ore in a manner similar to that of a normal ore by using lump pisolite as a bedding when charging a raw material to a sinter machine pallet (hereinafter referred to as Prior Art 2).
That). However, this method does not allow the use treatment of powdered pisolite.

On the other hand, in contrast to the prior arts 1 and 2, in JP-A-5-339654, high crystal water ore is preheated in a preheating furnace at 300 to 1000 ° C. to reduce the crystal water content. By mixing this with an iron ore other than a highly crystallized water ore, a mixed raw material composed of an auxiliary raw material, a solid fuel, etc., as a sintering raw material, the amount of heat consumed for decomposition / desorption of crystal water is reduced, A method has been proposed in which a maximum ultimate temperature during sintering is prevented from decreasing, and thereby a high-strength product sintered ore is produced while maintaining its productivity (hereinafter referred to as Prior Art 3).

[0013]

Recently, attention has been paid to the tendency that the mining amount of high crystal water ores such as pisolite ore is remarkably increasing with respect to the conventional mining amount of ordinary ores. To develop a method for producing sintered ore for blast furnace that ensures the quality level of the sintered ore and does not reduce the yield and productivity of the sintered ore even if a large amount of high crystal water ore is used. It was an issue.

Although the above-mentioned prior arts 1 and 2 exhibit their desired effects, both have the above-mentioned problems. On the other hand, the prior art 3 is newer than the prior arts 1 and 2 in that the high crystal water ore is heat-treated in advance to reduce the crystal water content and then charged into the sintering machine. This is a method not found in the conventional method of using highly crystalline water ore in the production of sinter.
However, in the prior art 3, the method of treating the highly crystallized water ore in the preheating line different from the sintering machine is still in the proposal stage. That is, in Prior Art 3, for preheating high crystal water ore, heating at 300 to 1000 ° C.,
Also, as an example, it is disclosed that preheating is performed at 800 ° C. for 10 minutes by a preheating furnace to reduce the water of crystallization content from 9.4% to 5.4%, and an industrially suitable heating device and I can't find any suggestions for heating conditions.

Therefore, an object of the present invention is to use a high crystal water ore containing 3 mass% or more of crystal water in the production of sinter for a blast furnace, and to mix the high crystal water ore in the sintering raw material. Of the sinter for a blast furnace that secures the quality level of the sinter and does not reduce the yield and productivity of the sinter, even when the sinter becomes high, for example, when it becomes about 15 mass%. It is to provide a manufacturing method.

[0016]

Means for Solving the Problems The inventors of the present invention have made extensive studies from the above viewpoint. First, paying attention to the sintering behavior and the properties of the sintered cake in the firing process based on the properties peculiar to the high crystal water ore described above, the high crystal water ore and the normal ore were unconditionally placed on the same pallet of the sintering machine. Therefore, we decided not to adopt the process of melting and sintering under the same thermal conditions. That is, high crystal water ore is classified by sieving treatment, and coarse grain parts that cause a disadvantageous behavior phenomenon in the sintering process in the firing process are subjected to dehydration treatment of crystal water in a separate line in advance, and The method of supplying the mixed raw material after removing the disadvantage of the crystal water ore or using it as the floor covering of the sinter machine pallet, where the crystallization water is dehydrated, and used for the treatment of mine discharge from the pallet in the normal operation of the sinter machine. Either the method according to the above method or the method of charging the blast furnace as a blast furnace raw material as a part of the lump ore is adopted, while the fine grain portion obtained by the classification is Firing process of coarse-grained high-crystal water ore by using it as a raw material for mixing with iron ore and non-high-crystal water ore with a low content of crystal water, or as a raw material for mixing with non-high-crystal water ore Unfavorable behavior phenomenon in Ensure that it is possible to prevent the occurrence, to obtain a knowledge that can solve the problems of the present invention by such method.

In the above, the dehydration treatment is to modify the ore (non-highly crystalline water ore) to a property as similar as possible to the property of the ore, and the method of use as a bedding is a raw material whose high temperature property is improved by the dehydration reaction. As a raw material that has been modified as similar to the properties of ore as a raw material for sintering, and the method of charging as lump ore into the blast furnace is inferior to the high temperature properties in the blast furnace. It is beneficial from the perspective of increasing production.

As described above, as a coarse-grained ore that can be the core particles of the pseudo-particulate sintering raw material to be charged into the sintering machine pallet, which is a common point of the methods adopted by the present inventors, a high crystal water ore as high as possible. The reason for considering not to use is based on the following findings. The present inventors have found that in the case of a sinter that uses a large amount of a high crystal water ore, coarse nuclei particles that become sinter nucleus particles in a sinter cake that are considered to be generated when the crystallization water decomposes and separates in the firing process. A detailed test and investigation was conducted on the occurrence of cracks formed inside the highly crystallized water ore, and when the highly crystallized water ore was the core particles, the larger the particle size of the core particles, the more the crack generation. It was found that the smaller the grain size, the less the number of cracks inside the coarse-grained high crystal water ore, and the smaller the amount of cracks in the entire sintered ore grain. It was Therefore, if the coarse-grained high crystal water ore is properly heated and the crystal water is sufficiently decomposed and removed, the intragranular cracks in the sintered ore will disappear, and the crushing and fine grinding will occur to some extent during the heating process. Granulated ore is hard to become a nuclear particle,
The particles become intermediate particles or adhered particles, and their adverse effects disappear.

Next, as an effective means for decomposing / removing water of crystallization from the highly crystallized water ore in the coarse-grained portion obtained at a predetermined classification point particle size, appropriate conditions are applied to the bedding layer of the sinter machine pallet. Focused on using below. Further, as another means for decomposing / removing water of crystallization, it was noticed that it can be effectively used / treated as a part of lump ore by setting appropriate conditions as a blast furnace raw material.

[0020] The above knowledge and focus are as follows in the sintering operation.
The crystal water content of the high crystal water ore is 3 mass% or more, and the mixing ratio of the high crystal water ore in the new raw material is 25 m among the sintering raw materials.
The above-mentioned problems become remarkable when the content is ass% or more, and the problems were obtained in order to solve the problems.

The present invention was made based on the above-mentioned various findings, and the gist thereof is as follows. That is, in the method for producing a sinter for blast furnace according to the invention of claim 1, when using a high crystal water ore as a sinter ore raw material in the step of producing sinter ore as a raw material to be charged into the blast furnace,
The highly crystallized water ore is subjected to sieving treatment into a coarse grain portion and a fine grain portion. Next, the high crystal water ore in the coarse grain portion is subjected to a heat treatment to decompose and separate the crystal water from the high crystal water ore, and the iron ore in which the crystal water is decomposed and separate and the fine grain portion Crystallized water ore and non-highly crystallized water ore are mixed and subjected to granulation treatment to form a granulated product, and the resulting granulated product is coated with powder coke to prepare pseudo particles, thus obtained. It is characterized by firing the pseudo particles.

In the method for producing sinter ore for blast furnace according to the second aspect of the present invention, when the high crystal water ore is used as a sinter ore raw material in the step of producing sinter ore as a raw material for charging into the blast furnace. The high crystal water ore is subjected to a sieving process into a coarse grain portion and a fine grain portion. Then, the high crystal water ore of the coarse grain portion was used as a bed ore in a sinter machine pallet, while the high crystal water ore of the fine grain portion was mixed with a non-high crystal water ore, and the resulting mixture was obtained. This is characterized in that a granulation treatment is performed to form a granulation product, the obtained granulation product is coated with powder coke to prepare pseudo particles, and the pseudo particles thus obtained are calcined.

In the method for producing a sinter for blast furnace according to the third aspect of the present invention, the high crystal water ore is used as a sinter ore raw material in the step of producing the sinter ore as a raw material for charging the blast furnace. The high crystal water ore is subjected to a sieving process into a coarse grain portion and a fine grain portion. Then, a part of the high crystal water ore of the coarse grain portion is used as a bed ore in a sinter machine pallet, while,
Heat treatment is applied to the rest of the high crystal water ore in the coarse grain portion to decompose and separate crystal water from the high crystal water ore,
Iron ore from which water of crystallization is decomposed and separated, high crystalline water ore of the fine-grained portion subjected to the above-mentioned sieving treatment, and non-highly crystalline water ore are mixed, and the resulting mixture is subjected to a granulation treatment for granulation. This is characterized in that a pseudo particle is formed by coating a powder coke on the obtained granulated product to form a pseudo particle, and firing the pseudo particle thus obtained.

A method for producing a sinter for a blast furnace according to a fourth aspect of the present invention is the method according to the first or third aspect of the present invention, wherein the high crystal water ore in a coarse grain portion is applied after the sieving treatment. The heat treatment is characterized by using a rotary kiln.

The method for producing a sinter for blast furnace according to the fifth aspect of the present invention uses the highly crystallized water ore as a sinter ore raw material in the step of producing sinter ore as a raw material to be charged into the blast furnace. The high crystal water ore is subjected to a sieving process into a coarse grain portion and a fine grain portion. Then, the high crystal water ore of the coarse grain portion is injected into the pulverized coal and charged into the blast furnace to lower the blast furnace top temperature by the decomposition heat thereof, while the high crystal water ore of the fine grain portion is changed to the non-high crystal water ore. And the resulting mixture is subjected to a granulation process to form a granulated product, the obtained granulated product is coated with powder coke to prepare pseudo particles, and the pseudo particles thus obtained are fired. It has a special feature.

A method for producing a sinter for a blast furnace according to a sixth aspect of the present invention is the method for producing a sinter for blast furnace according to any one of the first to fifth aspects, wherein the coarse crystal water ore obtained by sieving treatment is used. The feature is that the grain size of the grain portion is 3 mm or more.

According to the seventh aspect of the present invention, there is provided a method for producing a sinter for a blast furnace, wherein a high crystal water ore is used as a sinter ore raw material in a step of producing a sinter ore as a raw material for charging a blast furnace. The high crystal water ore is subjected to a sieving process into a coarse grain portion, an intermediate grain portion and a fine grain portion. Then, the high crystal water ore of the coarse grain portion is charged into a blast furnace to obtain the effect of claim 5, and the high crystal water ore of the intermediate grain portion is used in a sinter machine pallet as a part of a bed ore, Then, the high crystal water ore of the fine grain portion is mixed with a non-high crystal water ore, and the obtained mixture is subjected to a granulation treatment to form a granulated product, and the obtained granulated product is covered with powder coke. This is characterized in that the pseudo particles are prepared in this manner and the pseudo particles thus obtained are fired.

According to an eighth aspect of the present invention, there is provided a method for producing a sinter for blast furnace according to any one of the first to seventh aspects, wherein crystal water is 3 ma as the high crystal water ore.
It is characterized by using iron ore containing ss% or more and setting the compounding ratio of the high crystal water ore in the new raw material to 25 mass% or more.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred embodiments of the present invention will be described.

FIG. 1 shows a schematic flow of a sinter production process in the first embodiment of the present invention. This is after classifying high-crystal water ore into coarse-grained parts and fine-grained parts, heating coarse-grained high-crystal water ore to dehydrate crystal water, and then with fine-grained high-crystal water ore, non-high-crystal water ore This is the case where a sinter is produced by mixing with ore and using it as a mixed raw material. Table 1 shows the component composition and particle size distribution of a high-grade water ore of a typical brand used when producing a sinter according to the present invention.

[0031]

[Table 1]

As shown in FIG. 1, a normal ore 1 which is a non-highly crystalline water ore as a main raw material is used as an iron source base and a coarse raw material 27 such as dust and mill scale containing iron, a CaO auxiliary raw material and a SiO ₂ sub auxiliary. A blending powder 2 whose component composition and particle size distribution are adjusted by a bedding method together with an auxiliary raw material 10 'such as a raw material is conveyed to a sintering plant and stored in a predetermined raw material mixing tank 3. On the other hand, coarse grains such as lobe river and highly crystallized water ore 4 are subjected to sieving treatment by a sieving device 5 such as a vibrating sieve to be classified into coarse grain portions 6 and fine grain portions 7. The particle size of the classification point may be about 5 mm, which is a normal size that allows ordinary powdered ores to be easily classified by a conventional method. If possible, it is more desirable to reduce the size to about 3 mm by a special method such as an air classification / sorting method, because cracks formed in the coarse-grained high crystal water ore particles in the sintered cake 21 are less likely to occur. .

The coarse-grained portion 6 of the highly crystallized water ore 4 after classification is subjected to a predetermined heat treatment using the heating device 8 to sufficiently decompose and separate the crystal water in the highly crystallized water ore 4, and the dehydrated ore 9 To prepare. As a dehydration treatment method for crystal water, it is necessary to perform an efficient preliminary dehydration treatment. For example, as represented by a rotary kiln, a rotating cylindrical heating device whose axis is inclined with respect to the horizontal may be used, and treatment may be performed under appropriate conditions.

In this way, the dehydrated ore 9 obtained by sufficiently dehydrating the predetermined coarse-grained high-crystal water ore 6 was blended powder 2 prepared based on the non-high-crystallized water ore 1 and the predetermined fine-grain high-crystal. A mixed raw material 13 is prepared by mixing with the water ore 7. Further, a part or all of the dehydrated ore 9 may be conveyed to 2 and newly used as the blending powder 2. However, in the present invention, the "mixed raw material 13" is a so-called mixture of the ore raw material composed of the dehydrated ore 9 and the blending powder 2 and the predetermined auxiliary raw material 10 cut out from the raw material mixing layer 3 by a conventional method. The term "new raw material" refers to a mixed raw material in which powdered coke 11 as solid fuel and return ore 12 are mixed. Moisture is added to the mixed raw material 13, the humidity is controlled, mixed, and granulated. As a mixing / granulation processing device, a primary mixer 14,
The granulator 15 and then the secondary mixer 16 are used. A raw material is mixed using a drum mixer as the primary mixer 14, a drum mixer is preferably used as a granulating machine to granulate to a predetermined particle size using a disc pelletizer, and then a secondary mixer 16 is used as a granulating machine. A fixed amount of coke 17 is coated on the outer layer to prepare a pseudo particle 18, and the pseudo particle 18 is charged into a sintering machine 19. The pseudo particles 18 may be prepared by treating with the primary mixer 14 and the granulator 15 without passing through the secondary mixer 16. However, in this case, an equivalent amount of the external coating powder coke 18 is added to the mixed raw material 13.

As the sintering machine 19, an endless moving type lower suction type sintering machine having a grate (pallet) is used, and before the pseudo particles 18 as a sintering raw material are charged into the sintering machine 19, the sintering is performed. A bedding ore 20 is laid on the bottom of the pallet of the binding machine 19, pseudo particles 18 are charged and charged on the bottom, and the upper surface is ignited. Sinter machine 1
The sinter cake 21 discharged from No. 8 is crushed and sized, and a sinter having a predetermined grain size (3 to 5 mm) or more is made into a product sinter 22 and charged into the blast furnace 23 as a raw material for the blast furnace. On the other hand, sinter having a grain size of less than a predetermined value is used as a return ore 12 and a predetermined raw material mixing phase 3
Return to.

In the above, in the heat treatment of the coarse grain portion 6 of the high crystal water ore 4 by the rotary kiln, the untreated high crystal water ore (coarse grain portion 6) is moved by rolling in the direction of the downward tilt axis of the rotary kiln. A countercurrent high-temperature gas is passed from the discharge port of the untreated high-crystal water ore toward the charging port, in the direction of the moving direction of the untreated high-crystal water ore. The untreated highly crystalline water ore is heated by updating and expanding the contact area while updating the contact surface and exchanging heat with the atmosphere gas well. Untreated Highly crystalline water Ore is heated to above the decomposition / desorption temperature of crystalline water (generally bound water) and is not treated to efficiently reduce the content of crystalline water in the ore to below the target value. Controls the thermal history of highly crystalline water ores. As such a heating condition, it is extremely important to optimize the heat flow ratio U between the untreated highly crystallized water ore and the high-temperature gas for heating, and the heat flow ratio U is 1.0 to 0.
It has been revealed that it is desirable to be in the range of 75. Here, the heat flow ratio U between the untreated highly crystallized water ore and the hot gas for heating in the rotary kiln is defined by the following equation (1). That is, U = {ρ _s C _s Us _s (1-ε)} / (ρ _g C _g U _g ε) ... (1) where U: Heat flow ratio (-) ρ _s : High crystal water Density of ore in rotary kiln outlet (kg / m ³ ) ρ _g : Density of high temperature gas in rotary kiln outlet (kg / m ³ ) C _s : Specific heat at rotary kiln outlet of high crystal water ore (kcal / kg · ° C) C _g : Specific heat (kcal / kg · ° C.) at high temperature gas rotary kiln outlet U _s : Moving speed (m / h) at high crystal water ore rotary kiln outlet U _g : Flow velocity (m) at high temperature gas rotary kiln outlet / H) ε: Inner layer void ratio (-) of the rotary kiln. Then, in FIG. 2, the heat flow ratio U is 0.80.
At the time of (-), the simulation result of the dehydration behavior of the high crystal water ore by the rotary kiln under the predetermined dehydration treatment condition is shown.

FIG. 2 shows the particle temperature (T _s ) and gas temperature (T _g ) of the high crystal water ore moving from the raw material charging port to the discharge port of the rotary kiln, and the decomposition / desorption rate of crystal water contained therein. The transition of (F) shows that the water content of crystallization is 0 mas
It is shown with respect to the moving distance from the raw material charging port at each level of s%, 3 mass%, 6 mass% and 9 mass% ((a) and (b) of the same figure, respectively).
(C) and (d)). The simulation conditions are as shown in Table 2, and the porosity from the raw material inlet to the rotary kiln having a kiln diameter of 4.0 m and a length of 10.2 m was 0.80.
(-), Iron ore having a particle diameter of 3.0 mm and a temperature of 25 ° C was continuously charged at a moving speed of 9.0 m / hr, and a high temperature gas having a gas temperature of 500 ° C was flown from an outlet to a flow rate of 4.4 m / hr. se
Blow in with c. 8 units of gas amount in the rotary kiln
The production rate was set to 00 m ³ / t and the production rate was set to 50 t / hr. Further, when the crystal water content was 6 mass%, the ore particle diameter was compared with 3.0 mm and 7.0 mm (d = 3.0 mm and d = in the same figure (c), respectively).
7.0 mm).

[0038]

[Table 2]

From the figure, it is possible to quantitatively understand the situation in which the temperature of the ore particles is increased with the increase of the crystal water content and the decomposition / desorption speed of the crystal water is delayed in the high crystal water ore in the rotary kiln. can do. Further, it can be seen that the tendency of the delay becomes stronger as the ore particle size increases. Considering these simulation results,
Appropriate operating conditions for the rotary kiln can be determined.

FIG. 3 shows a schematic flow of a sinter production process in the second embodiment of the present invention. This is after classifying a high crystal water ore into a coarse grain part and a fine grain part, and then using the coarse grain high crystal water ore as a bedding ore of a sinter machine pallet, while,
Fine grain high crystal water ore is mixed with non-high crystal water ore and used as a mixed raw material to produce a sintered ore. As a typical high-crystal water ore used for producing a sinter according to the present invention, for example, those having the composition and particle size distribution shown in Table 1 are used.

Also in the second embodiment, as shown in FIG. 3, the ordinary ore 1 which is a non-highly crystalline water ore as the main raw material is used as the iron source base, and the auxiliary raw material 10 'is used together with the composition and particle size distribution by the bedding method. The blending powder 2 is adjusted, and the blending powder 2 is transported to a sintering plant and stored in a predetermined raw material mixing tank 3. On the other hand, high crystal water ore 4 such as Lobe River
A sieving device 5 such as a vibrating screen is used for sieving to classify the coarse particle portion 6 and the fine particle portion 7. The particle size of the classification point is 5 mm or preferably about 3 mm.

The coarse-grained portion 6 of the highly crystallized water ore 4 after classification is
It is used as a bed ore on the pallet of the sintering machine 19 (that is, at least a part of the bed ore is replaced), while the fine grain portion 7 of the highly crystallized water ore 4 is usually ore-based blending. A mixed material 13 is prepared by mixing the powder 2, the auxiliary material 10, the powder coke 11 and the return ore 12. Water is added to the mixed raw material 13, the humidity is controlled and mixed, and the mixture is granulated to a predetermined particle size, and then a predetermined amount of coke 17 is coated on the outer layer to prepare a pseudo particle 18, which is charged into a sintering machine 19. To do. As the apparatus from the mixed raw material 13 to the preparation of the pseudo particles 18 and the sintering machine 19, the apparatus according to the first embodiment is used. A bed ore 20 is laid on the bottom of the pallet of the sintering machine 19, pseudo particles 18 are charged and charged on the pallet, and then the upper surface is ignited.

As described above, the coarse-grained portion 6 of the high crystal water ore 4
Is used as the bed ore 20 of the sinter machine pallet. The bedding ore is formed into a layer of a predetermined thickness on the grate (grate) at the bottom of the pallet without adding powdered coke, and the heating, melting and sintering process of the sintering raw material charged on this It has a function of preventing fusion to the grate, preventing spillage from the gap of the grate bar, and preventing thermal deformation of the grate. The grain size is usually about 8 mm to 30 mm (or 5 mm).
mm to 20 mm) of sintered ore (a part of the product sintered ore is used) is used, and the layer thickness is formed to about 30 to 50 mm. In the present invention, the coarse-grained portion 6 of the high crystal water ore 4 is used.
The preferred method of using as a bedding is as follows.

It is clear that the particle size of the bed ore should not fall through the eyes of the great and should not impair the breathability of the bed with the bed ore. on the other hand,
The grain size of the coarse-grained portion 4 of the highly crystallized water ore 4 in the present invention is about 5 mm to 3 mm or more, so that the grain size portion in the vicinity of the lower limit is too small for bedding. Furthermore, consider the supply-demand balance between the supply amount of the coarse-grained portion 6 of the high crystal water ore 4 (varies depending on the amount of the high crystal water ore used and the composition ratio of +5 mm to +3 mm grain size) and the required amount of bedding. Therefore, if it is attempted to cover the entire amount of bedding with only the coarse grain portion 6, there may be a shortage in quantity. Therefore, conventional bedding ore (main: 8-30 mm, or 5
~ 20 mm, maximum grain size of about 50 mm)
It is desirable to use the coarse grain portion 6 in the upper layer portion. In addition, when both the bedding ore 20 and the coarse-grained portion 6 of the high crystal water ore are charged from the bedding hopper 26 to the bottom of the pallet, the equipment commonly used at the time of the segregation charging of the sintered ore raw material is used. The coarse-grained portion 6 can be distributed in the upper layer portion of the bedding layer using a similar device.

FIG. 4 shows the temperature (t _s ) at each part of the upper, middle and lower layers of the high crystal water ore when the entire bedding layer is formed of the high crystal water ore, and The behavior of the decomposition / desorption rate (F) of water of crystallization with respect to the time of heat treatment was as follows: the water content of water was 0 mass%, 5 mass% and 1%.
It is a graph which shows the simulation result about each level of 0 mass% (the same figure (a), (b), respectively).
And (c)). The simulation conditions are as shown in Table 3, and a coarse-grained high-crystal water ore with an ore grain size of 50 mm was used to form a bedding layer with a layer thickness of 100 mm and a porosity of 0.38 (-). This is the case where the gas having a temperature of 1000 ° C. in 1 above is sucked downward at a gas velocity of 0.5 m / sec.

[0046]

[Table 3]

From the figure, the high crystal water ore as the bedding is
The rate of temperature rise of ore particles as well as the rate of decomposition / desorption of crystal water is delayed as the content of water of crystallization increases. be able to. For example, under normal sintering operation conditions, even if the crystal water content is as high as about 10 mass%, and even if it is a high crystal water ore with a large particle size of 50 mm, it is large over the entire lower layer. Part of water of crystallization decomposes and separates. In consideration of such a simulation result, according to the property characteristics of the coarse grain portion 6 of the high crystal water ore 4 obtained after classification, the amount of the coarse grain portion occupied in the bedding, the moving speed of the pallet, etc. It can be reflected in operating conditions.

FIG. 5 shows that the water content of crystallization is 5.0 mass%.
If a high crystal water ore used in bedding, the behavior to the heat treatment time of the temperature of the ore (t _s) and degradation and extraction of the crystalline water (F), the particle diameter of the high crystal water ore 50mm of
It is a graph which compared the case of and the case of 5.0 mm. That is, the graph in FIG. 4B (ore grain size: 50 mm
2) and the case (b) in which the particle size is reduced to 5.0 mm and all other processing conditions are set to be the same (shown in FIG. ) And (b)). As is clear from the figure, due to the fine graining of the high crystal water ore, the rate of temperature rise of the high crystal water ore used for bedding was accelerated, and the rate of decomposition / desorption of the crystal water increased, resulting in dehydration. Be promoted. By such an examination, it is possible to estimate the dehydration state according to the grain size composition of the coarse grain portion 6 of the highly crystallized water ore 4 after classification, and reflect it in the sintering operation conditions.

FIG. 6 shows a schematic flow of a sinter production process in the third embodiment of the present invention. This is because after classifying high crystal water ore into coarse grain part and fine grain part, a part of high crystal water ore of coarse grain part is used as a bed ore on the sinter machine pallet, and further The rest of the crystal water ore is subjected to heat treatment and then mixed with fine-grained high crystal water ore and non-high crystal water ore and used as a mixed raw material to produce a sintered ore. As the typical high-crystal water ore used here, for example, those having the composition and particle size distribution shown in Table 1 are used.

Also in this third embodiment, as shown in FIG. 6, the ordinary ore 1 which is a non-highly crystalline water ore as the main raw material is used as the iron source base together with the auxiliary raw material 10 'by the bedding method to determine the composition and grain size. The blending powder 2 whose distribution has been adjusted is transferred to a sintering plant and stored in a predetermined raw material mixing tank 3. On the other hand, high crystal water ores such as Lobe River 4
Is subjected to a sieving process with a sieving device 5 such as a vibrating screen to obtain a coarse-grained portion 6
And the fine-grained portion 7 are classified. The particle size of the classification point is 5 mm or preferably about 3 mm.

The coarse-grained portion of the highly crystallized water ore 4 after classification is divided into two, and a part 6'is used as a bed ore in the pallet of the sintering machine 19 (that is, at least a part of the bed ore is replaced). In addition, the remaining portion 6 of the coarse grain portion is sufficiently decomposed and desorbed by the heating device 8 to prepare dehydrated ore 9. The dehydrated ore 9 is mixed with the blending powder 2 prepared based on the non-highly crystalline water ore 1, the above-mentioned predetermined fine-grained highly crystalline water ore 7, and the auxiliary raw material 10, the powder coke 11 and the returned ore 12, and the mixed raw material 13. To prepare. Water is added to the mixed raw material 13, the humidity is controlled and mixed, and the mixture is granulated to a predetermined particle size, and then a predetermined amount of coke 17 is coated on the outer layer to prepare a pseudo particle 18, which is charged into a sintering machine 19. To do. The apparatus from the mixed raw material 13 to the preparation of the pseudo particles 18 and the sintering machine 19 are
And an apparatus according to the second embodiment is used. Sintering machine 19
At the bottom of the pallet, a bedding ore 20 and a part 6 ′ of the above-mentioned coarse grain portion are laid, and the pseudo particles 18 are charged and charged on the floor ore, then the upper surface is ignited, and powder coke is burned by downward suction. And bake.

In this way, the coarse grain portion of the high crystal water ore 4 is divided into 6'and 6, each of which is used as a bed ore and subjected to heat dehydration treatment to form a part of the mixed raw material 13 by heating. This is effective when the low production rate operation of the device 8 is performed.

FIG. 7 shows a schematic flow of a sinter production process in the fourth embodiment of the present invention. This is after classifying high-crystal water ore into coarse-grained parts and fine-grained parts and then charging coarse-grained high-crystal water ore into the blast furnace, while fine-grained high-crystal water ores Mixed with ore and used as a mixed raw material,
This is the case when producing sinter. As the typical high-crystal water ore used here, for example, those having the composition and particle size distribution shown in Table 4 are used.

[0054]

[Table 4]

Also in this embodiment, as shown in the figure, the ordinary ore 1 which is a non-highly crystalline water ore as the main raw material is used as the iron source base, and the component composition and particle size distribution are adjusted by the bedding method together with the auxiliary raw material 10 '. The blended powder 2 thus obtained is transferred to a sintering plant and stored in a predetermined raw material mixing tank 3. On the other hand, the highly crystallized water ore 4 such as gore is subjected to a sieving process by a sieving device 5 such as a vibrating screen to classify it into a coarse grain portion 6 and a fine grain portion 7. The coarse-grained portion 6 is conveyed to the blast furnace 23 and charged as a blast furnace raw material. 8-50m in normal blast furnace operation
About 1 m of bulk ore is usually used as a part of the blast furnace main raw material.
About 0 to 25 mass% is charged, but the amount may be added thereto, or a part thereof may be replaced. Judge according to the production process plan, etc. However, in the embodiment of the present invention, since the high crystal water ore 4 is charged into the blast furnace, the crystal water is decomposed and released in the furnace. During this dehydration process, it is particularly important not to impair the in-furnace air permeability of the blast furnace, since some of it will be pulverized.
Therefore, the water content of crystallization as shown in Table 4 is 5 mass.
% Or less high crystal water content as low as possible (however, in the present invention, the crystal water content ≧ 3mas
s%) or a high crystal water ore with as low heat cracking property as possible. Further, it is preferable to set the classification point particle size to about 5 mm without reducing it to 3 mm.

On the other hand, the fine-grained portion 7 obtained by classification is the blending powder 2, the auxiliary raw material 10, and the powder coke 1.
The mixed raw material 13 is prepared by mixing 1 and the returned ore 12. Water is added to the mixed raw material 13, the humidity is controlled and mixed, and the mixture is granulated to a predetermined particle size, and then a predetermined amount of coke 17 is coated on the outer layer to prepare a pseudo particle 18, which is charged into a sintering machine 19. To do.
As the apparatus from the mixed raw material 13 to the preparation of the pseudo particles 18 and the sintering machine 19, the apparatuses according to the first, second and third embodiments are used. At the bottom of the pallet of the sintering machine 19, a bed ore 20
, And the pseudo particles 18 are charged and charged on it, then the upper layer surface is ignited, and the powder coke is burned by the downward suction to burn.

FIG. 8 shows a schematic flow of a sinter production process in the fifth embodiment of the present invention. This is to classify the high crystal water ore 4 into a coarse grain part 6, an intermediate grain part 25, and a fine grain part 7 into 3 and to charge the high crystal water ore of the coarse grain part 6 into the blast furnace 23 to obtain the intermediate grain part 25. High crystal water ore of the above is used as a part of the bedding ore in the pallet of the sintering machine 19,
And the high crystal water ore of the fine grain portion 7 is the non-high crystal water ore 1
The blending powder 2 prepared on the basis of the above, the auxiliary raw material 10, the powder coke 11 and the return ore 12 are mixed to prepare a mixed raw material 13. Next, the mixed raw material 13 is fired by the sintering machine 19 according to the fourth embodiment. In this embodiment, only the coarse grain portion 6 is charged into the blast furnace 23 and the intermediate grain portion 2
The reason why No. 5 is not charged into the blast furnace 23 is to alleviate the obstruction of the air permeability of the blast furnace in the same manner as the points to be noted regarding the charging of the coarse grain portion 6 into the blast furnace 23 in the fourth embodiment. Therefore, regarding the high crystal water ore 4 to be used as well, a high crystal water ore having a crystal water content of 5 mass% or less (however, 3 mass% or more) as low as possible or a high crystal water ore having low heat cracking property is desirable, The particle size of the classification point between the particles and the intermediate particles is also preferably about 5 mm.

[0058]

EXAMPLES The present invention will be described in more detail by way of examples.

Based on the sinter production flow shown in FIG.
As the high crystal water ore 4, the ores shown in Table 1 and several kinds of iron ores having a crystal water content of 3 mass% or more were used and classified into a coarse grain part 6 and a fine grain part 7 with a classification point grain size of 5 mm,
The coarse grain portion 6 was treated with a rotary kiln to prepare a dehydrated ore 9. On the other hand, the fine grain portion 7 remains as it is, the dehydrated ore 9,
A mixed raw material 13 was prepared by mixing the auxiliary raw material 10 such as a slag forming agent, the coke 11 and the return ore 12. In the above classification step, the classification point particle size is set to 3 mm, and the degree of classification is divided into three levels of weak, medium and thorough, and each of Example 1 (weak classification), Example 2 (medium classification) and Example 3 ( As a thorough classification), a sinter production test was conducted. The dehydration conditions in the rotary kiln of the high crystal water ore of the coarse grain portion 6 thus obtained were the same in Examples 1, 2 and 3.

On the other hand, as a comparative example, a blending powder containing highly crystallized water ore was prepared according to an ordinary sinter production flow and mixed with auxiliary raw materials such as a slag forming agent, powder coke and return ore to prepare a mixed raw material. Was prepared, water was added thereto, the humidity was adjusted and mixed, and pseudo particles were granulated to prepare a sintering raw material. Humidity control
Sintered ore was manufactured according to the mixing and granulating steps and the firing step in accordance with Examples 1 to 3. In each of Examples 1 to 3 and Comparative Example, a disk pelletizer was used as the granulator 15.

Table 5 shows the main operating conditions of the disc pelletizer and the sintering machine.

[0062]

[Table 5]

The blending ratio of the high crystal water ore in the new raw material is
27.5 in each of Examples 1 to 3 and Comparative Example
mass%. Here, the new raw material complies with the following definition by a conventional method. New raw material = main raw material (iron ore) + auxiliary raw material (slagging agent) + miscellaneous raw material (dust containing iron, mill scale, etc. that newly enters from outside the sintering plant).

Table 6 shows the main ingredients of the raw materials excluding the powder coke (the reference numeral 11 in FIG. 1 in Examples 1 to 3) in the mixed raw materials used in the tests of Examples 1 to 3 and Comparative Example. Representative examples of component composition and main particle size composition are shown below. In the comparative example, the high crystal water ore was not classified, whereas in the example 1, the example 2 and the example 3, the degree of classification was set to weak, medium and thorough, respectively. The properties of the entire raw material are also changing. For example, the composition ratio of the coarse-grained ore of +3 mm is the maximum in the comparative example, and
It decreases as it goes to a few points. In addition, the crystal water content of the ore contained in the entire raw material mainly accounts for ig.
The composition of the loss is also the maximum in the comparative example and the minimum in the example 3 as in the tendency of the composition ratio of the coarse-grained ore of +3 mm.

[0065]

[Table 6]

The sintering results and quality results obtained in Examples 1 to 3 and Comparative Example by performing the sintering operation under the above-mentioned test conditions are as follows. Table 7 shows the average particle size of the pseudo particles (reference numeral 18 in FIG. 1).
The production rate of sinter (t / m ² hr), yield (%), rotational strength (TI,%), JIS-RI (%) and RDI
(%) ((A), (b),
(C), (d) -1 and (d) -2). Here, sinter ore production rate = product sinter production amount / (actual work time × effective firing area), yield = {product sinter production amount / (new raw material + return ore)} × 100 Is.

[0067]

[Table 7]

According to the above-mentioned test results, in Examples 1 to 3, the production rate of sintered ore and the product yield, as well as the strength, the reducing property and the resistance to reduction pulverization, were compared with the conventional comparative example. Is excellent. And, each such characteristic value is improved as the classification degree of the high crystal water ore is strengthened.

As described above, even if a large amount of highly crystallized water ore is blended, the highly crystallized water ore is appropriately classified into a coarse grain portion and a fine grain portion, and the coarse grain portion is heated by a rotary kiln or the like to crystallize. If water is sufficiently dehydrated, the ore after dehydration is mixed with the fine-grained portion of the highly crystalline water ore and other raw materials, granulated, and appropriately prepared into pseudo-particles to be used as a sintering raw material, and then sintered. It was confirmed that the productivity, yield and quality of the ore could be improved. The reason why such results are obtained is that coarse-grained high-crystal water ore forms core particles of pseudo particles in the granulation process, but is fragile due to cracks generated in the core particles during the firing process. It is considered that as a result of the reduction and elimination of the parts, the strength of the sintered cake is improved and the yield of the product sintered ore is improved.

[0070]

EFFECTS OF THE INVENTION According to the present invention, the productivity and yield of the sintered ore, and the strength, the reducing property and the resistance to reduction pulverization are maintained even in the sintering operation under the condition that the highly crystalline water ore is mixed in a large amount. And stable operation is possible. Further, the high crystal water ore can be effectively used according to the supply and demand state of the high crystal water ore and the production process plan in the sintering operation and the blast furnace operation. It becomes possible to provide such a method for producing a sinter for a blast furnace, which brings industrially beneficial effects.

[Brief description of drawings]

FIG. 1 is a schematic flow chart of a sinter production process for explaining a first embodiment of the present invention.

FIG. 2 is an example of a simulation graph regarding a particle temperature, a gas temperature, and a dehydration behavior of crystal water of a high crystal water ore in the rotary kiln according to the first embodiment of the present invention.

FIG. 3 is a schematic flow chart of a sinter production process for explaining a second embodiment of the present invention.

FIG. 4 is a view showing the temperature of each of the upper layer portion, the intermediate layer portion and the lower layer portion of the high crystal water ore when the entire bedding layer is formed of the high crystal water ore in the second embodiment of the present invention; It is also an example of a simulation graph regarding the dehydration behavior of crystal water.

FIG. 5 shows the temperature of ore and the dehydration behavior of crystal water when a high crystal water ore is used for bedding in the second embodiment of the present invention, when the particle size is 50 mm and 5.0 mm. It is an example of a simulation graph comparing.

FIG. 6 is a schematic flow chart of a sinter production process for explaining a third embodiment of the present invention.

FIG. 7 is a schematic flow chart of a sinter production process for explaining a fourth embodiment of the present invention.

FIG. 8 is a schematic flow chart of a sinter production process for explaining a fifth embodiment of the present invention.

FIG. 9 is a graph comparing the sintering operation result and the quality result of the sintered ore between the example and the comparative example.

[Explanation of symbols]

1 Normal Ore (Non-High Crystal Water Ore) 2 Blending Powder 3 Raw Material Mixing Layer 4 High Crystal Water Ore 5 Sieve Device 6, 6'Coarse Grain Part (High Crystal Water Ore) 7 Fine Part (High Crystal Water Ore) 8 Heating Equipment (rotary kiln) 9 Dehydrated ore 10, 10 'Sub-raw material 11 Solid fuel (powder coke) 12 Return ore 13 Mixed raw material 14 Secondary mixer (drum mixer) 15 Granulator (disk pelletizer or drum mixer) 16 Secondary mixer ( Coating mixer) 17 Powder coke 18 Pseudo particle 19 Grate transfer type sintering machine 20 Floor ore 21 Sintered cake 22 Sintered cake 23 Blast furnace 24 Blast furnace raw material sintered ore 25 Intermediate grain part (high crystal water ore) 26 Bed Floor hopper 27 Miscellaneous ingredients

Claims (8)

[Claims] 1. When using a highly crystallized water ore as a raw material for a sintered ore in a step of producing a sintered ore as a raw material for charging a blast furnace, the highly crystallized water ore is divided into a coarse grain portion and a fine grain portion. After sieving treatment, the coarse grain portion of the high crystal water ore is subjected to a heat treatment to decompose and separate the crystal water from the high crystal water ore, and the iron ore in which the crystal water is decomposed and separate, Fine grained high crystal water ore and non-high crystal water ore are mixed, granulated to form granules, and the obtained granules are covered with powder coke to prepare pseudo particles. Then, the method for producing a sinter for a blast furnace, which comprises firing the thus obtained pseudo particles. 2. When using a high crystal water ore as a raw material for a sinter in a process of producing a sinter, which is a raw material for charging a blast furnace, the high crystal water ore is divided into a coarse grain portion and a fine grain portion. Sieving, then using the coarse-grained high-crystal water ore as a bed ore on a sinter pallet, while mixing the fine-grained high-crystal water ore with a non-high-crystal water ore, The obtained mixture is subjected to a granulation treatment to form a granulated product, the obtained granulated product is coated with powder coke to prepare pseudo particles, and the pseudo particles thus obtained are characterized by baking. To do
Manufacturing method of sinter for blast furnace. 3. When using a high crystal water ore as a raw material for a sinter in a process of producing a sinter, which is a raw material to be charged into a blast furnace, the high crystal water ore is divided into a coarse grain portion and a fine grain portion. Sieving, then using a portion of the coarse-grained high crystal water ore as a bed ore on a sinter machine pallet, while:
Heat treatment is applied to the rest of the high crystal water ore in the coarse grain portion to decompose and separate crystal water from the high crystal water ore,
Iron ore from which water of crystallization is decomposed and separated, high crystalline water ore of the fine-grained portion subjected to the sieving treatment, and non-highly crystalline water ore are mixed, and the obtained mixture is subjected to granulation treatment for granulation. A method for producing a sinter for a blast furnace, which comprises: forming a product, coating the obtained granulated product with powdered coke to prepare pseudo particles, and calcining the pseudo particles thus obtained. 4. The blast furnace sintering according to claim 1, wherein the heat treatment applied to the high crystal water ore in the coarse grain portion after the sieving treatment is performed using a rotary kiln. Method of producing ore. 5. When using a high crystal water ore as a raw material for a sinter in a process of producing a sinter, which is a raw material to be charged into a blast furnace, the high crystal water ore is divided into a coarse grain portion and a fine grain portion. After sieving, the coarse grained high crystal water ore is charged into a blast furnace, while the fine grained high crystal water ore is mixed with a non-high crystal water ore to form a mixture. Sintering for a blast furnace, characterized by forming a granulated product by subjecting it to a granulation process, coating the obtained granulated product with powder coke to prepare a pseudo particle, and firing the pseudo particle thus obtained. Method of producing ore. 6. The blast furnace calcination according to claim 1, wherein the grain size of the coarse grain portion obtained by the sieving treatment of the high crystal water ore is 3 mm or more. Manufacturing method of calculus. 7. When using a high crystal water ore as a raw material for a sinter in a step of producing a sintered ore as a raw material for charging a blast furnace, the high crystal water ore is used as a coarse grain part, an intermediate grain part and a fine grain part. After sieving into grain portions, the coarse grain portion of high crystal water ore is charged into a blast furnace, and the intermediate grain portion of high crystal water ore is used on a sinter machine pallet as part of a bed ore. And, the high crystal water ore of the fine grain portion is mixed with a non-high crystal water ore, and the obtained mixture is subjected to a granulation treatment to form a granulated product, and the obtained granulated product is powdered coke. A method for producing a sinter for a blast furnace, characterized in that a pseudo particle is prepared by packaging, and the pseudo particle thus obtained is fired. 8. Crystal water of 3 ma is used as the high crystal water ore.
The iron ore containing ss% or more is used, and the compounding ratio in the new raw material of the high crystal water ore is set to 25 mass% or more, for a blast furnace according to any one of claims 1 to 7. Manufacturing method of sinter.