JPH09278568A - Manufacturing method of Ku soluble potassium fertilizer - Google Patents

Abstract

(57) [Abstract] [Problem] An extremely large amount of heat is required when reacting a prepared raw material. In addition, the manufacturing process is very complicated. SOLUTION: In the fusion processing step A, CaO, Mg
1 selected from the group consisting of O, Al ₂ O ₃ and Fe ₂ O ₃
A raw material melt obtained by adding a potassium raw material to a raw material melt containing one or more components and SiO ₂ and further adding a component adjusting agent as necessary to melt the potassium raw material and the component adjusting agent. Then, in the cooling and solidifying step C, the fusion melt processed in the fusion processing step A is cooled and solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention contains a potassium-soluble potassium fertilizer having a slow-release effect, which contains a potassium component which is insoluble in water but is soluble in citric acid (hereinafter, this potassium component is referred to as "ku-soluble potassium"). Manufacturing method.

[0002]

2. Description of the Related Art As a soluble potassium compound, [K ₂ O
.Al ₂ O ₃ .2SiO ₂ ], [K ₂ O. (Al, F
e) ₂ O ₃ .2SiO ₂ ], [K ₂ O.MgO.SiO
₂ ], [K ₂ O · CaO · SiO ₂ ] and the like are known. And many proposals have been made about the method of producing these potassium compounds and producing a sparingly soluble potassium fertilizer.

For example, in JP-A-60-127286, powders of quartz rock, blast furnace slag, nickel ore slag, phosphorous slag, andesite and the like are mixed with a potassium raw material such as potassium carbonate, and then this mixture is mixed. A method of heating and melting to obtain a soluble potassium fertilizer is shown.

Further, in Japanese Patent Laid-Open No. 55-51785, fly ash collected by a dust collector of a coal-fired power plant is added with a potassium raw material such as potassium carbonate or caustic potash, and then pulverized coal is added. It is disclosed that a potassium-soluble potassium fertilizer is produced by reacting a potassium raw material with a composition of fly ash by granulating the granules and firing the granulated material.

[0005]

In each of the above-mentioned prior arts, a step of melting or firing is necessary when reacting the prepared raw material, and because of the heating, an extremely large amount is required. There is a problem that it requires heat.

Further, in particular, in the method of making the potash raw material soluble by firing the mixture of fly ash and potash raw material, the step of pulverizing the raw material, the step of granulating the raw material, and the granulation There is also a problem that the manufacturing process is very complicated because a process for drying the object has to be provided.

An object of the present invention is to solve the above-mentioned problems, and to provide a method for producing a fusible potash fertilizer in which the amount of heat required for heating a raw material is small and the production process is simplified.

[0008]

[Means for Solving the Problems]
Therefore, in the present invention, CaO, MgO, Al
_TwoO _Three, Fe_TwoO_ThreeOne selected from the group consisting of or
Two or more kinds of components and SiO_TwoThe raw material melt containing
Raw material is added, and this potassium raw material is melted to melt the raw material.
And then cool this fused melt.
And solidify.

Further, in the present invention, in the presence of molten metal, one or more components selected from the group consisting of CaO, MgO, Al ₂ O ₃ and Fe ₂ O ₃ and SiO _{2 are used.}
The potassium raw material is added to the raw material melt containing the, and the potassium raw material is melted and fused with the raw material melt. Then, the fusion-treated melt is taken out, cooled and solidified.

Hot metal can be used as the molten metal to be present when the raw material melt and the potassium raw material are fused as described above.

In each of the above inventions, a potassium raw material is added to a raw material melt, and when the potassium raw material is melted and fused with the raw material melt, a component modifier is added together with the potassium raw material, if necessary.

When a potassium raw material is added to the raw material melt and the potassium raw material is melted and fused with the raw material melt,
If necessary, a carbon material is added together with the potassium raw material, oxygen gas or an oxygen-containing gas is further supplied, and the carbon material is burned to heat the raw material melt and the potassium raw material.

When a potassium raw material is added to the raw material melt and the potassium raw material is melted and fused with the raw material melt,
If necessary, a component modifier and a carbon material are added together with the potassium raw material, and further oxygen gas or an oxygen-containing gas is supplied to burn the carbon material to heat the raw material melt, the component modifier and the potassium raw material.

In each of the above inventions, slag (desiliconized slag) generated when the molten pig iron discharged from the blast furnace is subjected to desiliconization treatment can be used as the raw material melt.

When the potassium raw material is added to the raw material melt having the above composition, the potassium raw material is decomposed and then melted to fuse with the raw material melt. At this time, the component in the raw material melt and the potassium component react with each other to form a fusible potassium compound.

Raw material melts capable of producing a fusible potassium compound by reaction with a potassium raw material include slags such as blast furnace slag, converter slag and electric furnace slag discharged during metal smelting. These slags are Si
O ₂ , and CaO, MgO, Al ₂ O ₃ , Fe ₂ O ₃
In addition to containing such components, it is in a molten state at the time of discharge, so if a potassium raw material is added to this molten slag, the potassium raw material immediately melts and decomposes to form a soluble fusible potassium compound. Is started.

In the case of producing a fusible potassium compound from the above-mentioned slags as raw materials, the SiO ₂ content is usually insufficient, so that silica sand, fly ash during coal combustion, refuse incineration ash, etc. A substance containing a large amount of SiO ₂ is added to adjust the composition.

Potassium salts such as potassium carbonate, potassium bicarbonate and potassium sulfate, and potassium-containing minerals such as potassium feldspar are used as potassium raw materials.

If the potassium raw material to be added is, for example, potassium carbonate, it is melted and decomposed when added to the high temperature raw material melt, and the reaction with the raw material melt is started. However, when the potassium raw material is potassium sulfate that is difficult to thermally decompose, it is preferable to charge a carbon material together with the potassium raw material and reduce the potassium sulfate in the melt to change it into a form that is easily thermally decomposed.

In the present invention, since one of the main raw materials is in a molten state, it is not necessary to heat the raw material so that it is melted. As it is supplied from a commercial source, the fusion of the two raw materials takes place very thermoeconomically. Moreover, since one of the main raw materials is already melted, the processing operation is completed in a short time.

By the way, when the raw material melt and the potassium raw material are subjected to the fusion reaction, if the amount of the potassium raw material or the component adjusting agent is large, the temperature of the raw material melt is lowered and the temperature is kept within a predetermined range. You will not be able to do it, and you will need to replenish heat. Therefore, in the present invention, in order to supply heat to the raw material melt, molten metal can be present when the raw material melt and the additive such as the potassium raw material are fused.

For example, when hot metal, which is one of the molten metals, is present, the physical properties of the hot metal and the slag, which is one of the raw material melts, are compared.
Since the specific heat is almost the same as that of the slags, the heat capacity of the hot metal is about twice that of the slags with the same capacity. When the raw material melt and the potassium raw material are subjected to the fusion reaction, if the hot metal having a large heat capacity is present, the hot metal serves as a heat storage body and serves as a heat supply source. For this reason, the temperature drop of the reactant such as the raw material melt remains small, and the temperature in the reaction system is maintained within a predetermined range. At this time, when a large amount of hot metal is present, the amount of heat stored in the reaction system increases, and it becomes easier to maintain the temperature.

However, in the case of charging the potassium raw material or the component adjusting agent in an amount exceeding the limit, it is insufficient to replenish the heat from the hot metal alone. Therefore, the carbon material is added and the oxygen gas or the oxygen-containing gas is supplied. Then, the carbon material is burned and heated by the heat of combustion. At this time, since the hot metal having a large heat capacity is present, most of the heat supplied by the combustion is stored in the hot metal. Therefore, the temperature fluctuation of the reactant such as the raw material melt can be reduced, and the temperature of the fusion reaction can be easily maintained within a predetermined range.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a manufacturing process according to the invention of claim 1. The production of the Ku-soluble potassium fertilizer according to the present invention is performed by a fusion treatment step A in which a potassium raw material is added to a raw material melt such as molten slag and melted and reacted with the components of the raw material melt, and a fusion treatment in this fusion processing step. The cooling and solidifying step C of cooling and solidifying the melted material is performed.

In the fusion processing step A, if necessary, a component adjusting agent is added to adjust the components of the melt. In addition, heat is supplied to melt the potassium raw material, if necessary.

As the method for cooling and solidifying the fused melt in the cooling and solidifying step C, a method in which high-pressure air is blown to the fused melt to scatter it, and the melt is cooled and granulated, or high pressure is used. There are a method of spraying water to scatter, cooling and granulating (water granulation), a method of leaving the molten slag in the air to cool and solidify, and either method may be adopted.

FIG. 2 is a diagram showing an example of an apparatus for carrying out the invention of claim 1. In FIG. In this figure, 10 is a reaction tank, and 50 is a raw material melt such as slag generated during metal smelting. The reaction tank 10 has a lid 11 and is of a hermetically-sealed type, and a pressure state in the tank can be adjusted by a damper 13 provided in an exhaust gas duct connected to a gas outlet 12. Further, the reaction tank 10 is provided with various lances penetrating the lid 11. Reference numeral 14 is a lance for stirring the raw material melt 50, to which a nitrogen gas pipe is connected. Reference numeral 15 is a lance for blowing a potash raw material, 16 is a lance for blowing a component adjusting agent, and 17 is a lance for blowing a powder coke. Nitrogen gas pipes are connected to these lances 15, 16 and 17, respectively. Reference numeral 18 is a lance (oxygen lance) for supplying oxygen gas or oxygen-containing gas. 20 is a potassium raw material hopper, 2
Reference numeral 1 is a component adjusting agent hopper, 22 is a powder coke hopper, and these hoppers 20, 21, 22 are provided with feeders 23, 24, 25, respectively.

The component adjusting agent supply system including the hopper 21, the feeder 24, and the lance 16, the powder coke supply system including the hopper 22, the feeder 25, and the lance 17, and the oxygen gas supply system are used as necessary. .

Using the above-mentioned apparatus, for example, the process of mixing and melting the raw material melt, the potassium raw material, and the component adjusting agent to be used, if necessary, is performed as follows.

First, the raw material melt 50 is received in the reaction tank 10, and the amount of the received melt 50 is measured. Next, a predetermined amount of potassium raw material with respect to the received amount of the raw material melt is weighed and stored in the hopper 20. Further, a predetermined amount of the component adjusting agent for the composition of the raw material melt and the received amount thereof is measured and stored in the hopper 21. Then, while blowing the nitrogen gas from the lance 14 to stir the raw material melt 50, the feeder 23 and the feeder 24 are activated to start the hopper 2.
The potassium raw material in 0 and the component adjusting agent in the hopper 21 are extracted, and each is flown by nitrogen gas to carry out lance 15,
The raw material melt 50 is blown from the lance 16. The injected potassium raw material is melted, decomposed and melted into the raw material melt 50. In addition, the blown component modifier is also melted and melted into the raw material melt 50. At this time, since the viscosity of the melt is greatly lowered by the melting of the potassium raw material, the stirring of the melt becomes easier as the blowing amount of the potassium raw material increases.

Further, since the temperature of the raw material melt 50 is lowered by charging the potassium raw material and the component adjusting agent,
The feeder 25 is activated to load the coke powder in the hopper 22. The coke powder is pneumatically transported by nitrogen gas and blown into the raw material melt 50 from the lance 17. Simultaneously with the blowing of the powder coke, the blowing of the oxygen gas or the oxygen-containing gas from the lance 18 is started, and the raw material melt 5
Burn coke powder in zero. The heat of combustion heats the melt and maintains its temperature. The coke powder and the oxygen gas or the oxygen-containing gas are supplied while the flow rate is adjusted so that the temperature of the melt is kept within a predetermined range.

Even after the charging of the predetermined amount of potassium raw material and the component adjusting agent is completed, the stirring of the melt by the blowing of the nitrogen gas from the lance 14 is continued for a while, and the unmelted substance exists in the reaction tank 10. After making the state not to perform, the melted material subjected to the fusion treatment is discharged and sent to the cooling and solidifying step.

In the cooling and solidifying step, the fusion-processed melt is poured into the gutter, and high-pressure air is blown to the melt dropped from the gutter. Then, the melt is scattered while falling, is cooled and granulated, and becomes a product of a fusible potassium fertilizer.

On the other hand, the exhaust gas is sent to the exhaust gas treatment device for purification and then discharged. If the raw material melt to be fused with the potassium raw material does not require component adjustment, the component adjusting agent is not charged.

When the potassium raw material and the component adjusting agent are charged, the temperature of the raw material melt 50 is lowered, but the melting point of the melt is lowered due to the change in the composition due to the melting of the potassium raw material. If the amount is small, the melt remains in a stirrable molten state. Therefore, when the amount of the potassium raw material charged is relatively small, the coke dust and the oxygen gas or the oxygen-containing gas may not be blown.

The method of adding the potassium raw material, the component modifier, and the coke powder is not limited to the method of air-flowing and blowing into the raw material melt 50. The method of adding above may be sufficient.

FIG. 3 is a diagram showing another example of an apparatus for carrying out the invention of claim 1. In FIG. In this figure, the same components as in FIG. 2 are assigned the same reference numerals and explanations thereof are omitted. In FIG. 3, the oxygen lance 18 for supplying the oxygen gas or the oxygen-containing gas is not inserted to the level of being immersed in the raw material melt 50. The supply of the oxygen gas or the oxygen-containing gas in the present invention is performed to burn the powder coke to heat the potassium raw material or the raw material melt, and the supply method is to burn the added powder coke. Any method can be used. Then, the powder coke can be burned by merely blowing the oxygen gas or the oxygen-containing gas onto the raw material melt in the vigorous stirring state.

FIG. 4 is a diagram showing basic processing steps according to the invention of claim 2. In FIG. The invention of claim 2 is to fuse a potassium raw material and a raw material melt such as molten slag in the presence of a molten metal, and the basic treatment for obtaining a fusible potassium fertilizer is the molten metal and the raw material melt. And the potassium raw material are mixed,
A fusion treatment step A in which the potassium raw material is melted and reacted with the components of the raw material melt, and then a fusion material separation step B in which a fusion molten material produced by fusing the potassium raw material and the raw material melt and a molten metal are separated, and It is carried out by a three-stage operation including a cooling and solidifying step C for cooling and solidifying the separated fused melt.

In the fusion processing step A, if necessary, a component adjusting agent is added to adjust the components of the raw material melt. Further, when mixing the above raw materials, a carbon material such as powder coke is added and an oxygen gas or an oxygen-containing gas is supplied to burn the carbon material, and heat for heating and melting the potassium raw material and the component modifier. To replenish.

As the method of cooling and solidifying the fused melt in the cooling and solidifying step C, the same method as in the case of the invention of claim 1 is adopted.

FIG. 5 is a diagram showing a treatment method in the case of repeatedly using the molten metal present when the potassium raw material and the raw material melt were fused. In FIG. 5, description of the items described in FIG. 4 will be omitted.

In this embodiment, the fusion melt and molten metal produced in the first fusion treatment step A ₁ are separated in the fusion separation step B ₁ . The separated fusion melt is sent to the cooling and solidifying step C to be solidified and becomes a soluble potassium fertilizer.
Then, the molten metal is used in the next fusion treatment. In the fusion processing step A ₂ in which the second processing is performed,
To the molten metal separated in the fusion product separation step B ₁ , a potassium source as a raw material, a raw material melt, and a carbon material are added, and oxygen gas or an oxygen-containing gas is supplied. The potassium source and the raw material melt are fused to form a fused melt. The fusion melt and the molten metal are separated in the fusion separation step B ₂ , and the fusion melt is sent to the cooling and solidification step C. Then, the molten metal is used when performing the third fusion treatment. In the fusion treatment step A ₃ in which the _third treatment is performed, the same operation as in the case of the fusion treatment is performed, and the produced fusion melt and molten metal are separated in the fusion separation step B ₃ . The fusion melt is sent to the cooling and solidifying step C to be solidified, and the molten metal is sent to the next step.

Although FIG. 5 shows an example in which the molten metal is repeatedly used three times, the number of times the molten metal is repeatedly used is not particularly limited, and its characteristics are fusion treatment or fusion. The repeated use can be continued until the operation of the separation process is disturbed.

FIG. 6 is a diagram showing an example of an apparatus for carrying out the invention of claim 2. 6, the same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. In this example, the molten metal 51 is received together with the raw material melt 50 such as molten slag. And
The lance provided in the reaction tank 10, that is, the lance 14 for stirring the contents, the lance 15 for blowing the potassium raw material, the lance 16 for blowing the component adjusting agent, the lance 17 for blowing the coke powder, and the lance 18 for the oxygen are It is designed to be inserted into the molten metal 51.

The component adjusting agent supply system including the hopper 21, the feeder 24, and the lance 16, the powder coke supply system including the hopper 22, the feeder 25, and the lance 17, and the oxygen gas supply system are used as necessary. .

The process of fusing the raw material melt and the potassium raw material using the above apparatus is carried out as follows.

First, the raw material melt 50 such as molten slag and the molten metal 51 are received in the reaction vessel 10, and the received amount of the raw material melt is measured. Next, a predetermined amount of potassium raw material with respect to the received amount of the raw material melt is weighed and stored in the hopper 20. If necessary, the composition of the raw material melt and a predetermined amount of the component modifier with respect to the amount received are weighed and stored in the hopper 21. Then, nitrogen gas is blown into the molten metal 51 from the lance 14 to stir the raw material melt 50 and the molten metal 51 together, and the feeder 23 and the feeder 24 are activated to activate the potassium raw material in the hopper 20 and the hopper 21. The component adjusting agent is extracted, and nitrogen gas is pneumatically transported and blown into the molten metal 51 from the lance 15 and the lance 16. The potassium raw material and the component modifier that have been blown are heated and melted by the molten metal 51 present in a large amount, and melt into the raw material melt 50.

As described above, the potassium raw material and the component modifier which have been blown are heated by the heat transfer from the molten metal 51, but the temperature of the molten material in the reaction tank is lowered by charging the raw material. Therefore, the feeder 25 is activated to load the powder coke in the hopper 22. The powder coke is transported by air stream with nitrogen gas, and the molten metal 5 is discharged from the lance 17.
It is blown into 1. Simultaneously with the blowing of the powder coke, the blowing of the oxygen gas or the oxygen-containing gas from the lance 18 is started, and the molten metal 51 or the raw material melt 50 is started.
Burn coke powder inside. The molten metal 51 and the raw material melt 50 are heated by this combustion heat, and the temperature thereof is maintained. The coke powder and the oxygen gas are supplied while the flow rate is adjusted so that the temperature of the melt in the tank is kept within a predetermined range.

Even after the charging of the predetermined amount of potassium raw material and the component adjusting agent is completed, the stirring of the melt by the blowing of the nitrogen gas from the lance 14 is continued for a while, and the unmelted substance is present in the reaction tank 10. After the state where the fusion is not performed, the fusion melt and the molten metal are separated, and the fusion melt is discharged.
The discharged fusion melt is sent to a cooling and solidifying device.

On the other hand, the molten metal from which the fused melt has been separated is sent to the next step, or is left in the reaction tank 10 and is used for the next fusion treatment. In the second and subsequent fusion processes, the same processing operation as above is performed after the raw material melt is received.

Further, the lances 14, 15, 16 of FIG.
17 and 18 were inserted above the molten metal 51 and into the raw material melt, a bottom blowing nozzle was provided at the bottom of the reaction tank 10 to send nitrogen gas, and the raw material melt and the molten metal were separately stirred. You may implement.

Further, the method of adding the potassium raw material, the component modifier, and the powder coke is not limited to the method of air-flowing and blowing into the raw material melt 50, and the raw material is fed from the upper part of the reaction tank 10. A method of adding it onto the melt 50 may be used.

Further, in FIG. 6, the oxygen lance 18 is used.
Is inserted to the level of being immersed in the molten metal 51, and the oxygen gas or the oxygen-containing gas is blown into the molten metal 51. However, as in the case of FIG. Since the coke powder can be burned by itself, the oxygen gas or the oxygen-containing gas is used as the raw material melt 5 without immersing the oxygen lance 18 in the melt.
You may spray on 0.

It is preferable to use the most practical hot metal as the molten metal to be present when the raw material melt and the potassium raw material are fused.

7 and 8 are views showing an example of an apparatus for carrying out the invention of claim 3. In FIG. FIG. 7 is a diagram showing a plane, and FIG. 8 is a diagram showing a cross section, both of which are schematically shown. In FIG. 7 and FIG. 8, 30 is a main gutter for flowing down the molten pig iron discharged from the blast furnace, 31 is provided in the skinmer part thereof, a weir for separating the molten pig iron and the blast furnace slag, and 32 is the separated blast furnace slag. It is a slag gutter that makes it flow down. A potting material lance 15 and a component adjusting agent lance 16 are provided at a location upstream of the weir 31 of the main gutter 30. The tips of these lances 15 and 16 are inserted to the depth at which the hot metal 51a flows, and nitrogen gas pipes are connected to the upper portions thereof. Then, one of the nitrogen pipes is connected to a potassium raw material supplying device including a potassium raw material hopper 20 and a feeder 23, and the other is connected to a component adjusting agent hopper 21 and a component adjusting agent supplying device including a feeder 24. There is. Therefore, the potassium raw material and the component adjusting agent can be blown into the flowing molten pig iron slag.

The process of fusing the blast furnace slag and the potassium raw material using the above apparatus is performed as follows. First, the flow rate value of the potassium raw material and the flow rate value of the component adjusting agent calculated based on the expected flow rate of the blast furnace slag flowing down together with the hot metal and the expected composition thereof are set in the feeder 23 and the feeder 24, respectively. Then, while the nitrogen gas is flowing through the nitrogen pipes while the molten pig iron is flowing down, the feeder 23 and the feeder 24 are activated, and the potassium raw material and the component adjusting agent are blown into the molten pig iron 51a from the lances 15 and 16. The potassium raw material and the component adjusting agent that have been blown are heated and melted while flowing down together with the hot metal 51a, and are floated to the blast furnace slag 50a.
Blend in. Potassium raw material, ingredient adjuster, blast furnace slag 3
The fused melt 52 obtained by fusing the raw materials is separated from the hot metal 51a in the skinmer portion, then is branched to the slag gutter 32 and sent to the cooling and solidifying device.

In the above method, since the raw material composition is calculated based on the expected value of the blast furnace slag flow rate, the components of the fusion-processed product will vary to some extent. Therefore, when it is necessary to strictly control the ingredients of the product,
It is preferable to adjust the components by charging the fusion melt 52 shunted to the slag gutter 32 into the apparatus shown in FIG. 2 or 3 described above, and adding the insufficient component raw materials and performing the fusion treatment.

[0058]

【Example】

(Example 1) Molten blast furnace slag (composition is shown in Table 1) discharged from the ironmaking process of an iron mill, silica sand and potassium carbonate were used as raw materials, and the solubility was improved by the method described with reference to FIGS. 1 and 2. Produced potash fertilizer.

First, 100 parts by weight of blast furnace slag was received in a reaction tank, and while nitrogen gas was blown from a stirring lance to agitate the slag, silica sand and potassium carbonate were continuously charged little by little to 39.3 parts by weight. Of silica sand and 57.6 parts by weight of potassium carbonate were mixed. At this time, oxygen gas was blown in while continuously adding powdered coke little by little to keep the temperature of the contents in the tank at about 1400 ° C. The addition of coke and the blowing of oxygen gas prevented the temperature of the contents in the tank from lowering, and fused silica sand and potassium carbonate.

When all the silica sand and potassium carbonate had fused with the blast furnace slag, the fused melt was discharged from the reactor and cooled to solidify. In the cooling and solidifying treatment of the fused melt, high pressure air was blown, scattered to cool and granulated, and the melt was granulated using an apparatus (granulator).

The results of analysis of potassium and silicic acid in this granular material are shown in Table 2. In Table 2, T-K ₂ O
All Cali, C-K ₂ O is click-soluble potassium (K ₂ O fraction was dissolved in 2% citric acid), W-K ₂ O represents an aqueous potassium. Further, T-SiO ₂ represents all silicic acid, and S-SiO ₂ represents soluble silicic acid. As is clear from this table, among the potassium components contained in the granular material, very few are soluble in water, and most of them are soluble in potassium. Therefore, the above-mentioned granular material has a property that it can be supplied as a slow-release potassium fertilizer. Further, the above-mentioned granular material contained a large amount of soluble silicic acid, and had a property that it could be a supply source of silicic acid.

(Example 2) Using the molten blast furnace slag (composition shown in Table 1), silica sand and potassium carbonate discharged from the ironmaking process of a steel mill as raw materials, the same operation as in Example 1 was performed. , Ku-soluble potassium fertilizer was manufactured. However, in this case, as shown in FIG. 3, the oxygen lance was not inserted into the blast furnace slag, and the oxygen gas was supplied by a method of spraying the oxygen gas onto the blast furnace slag.

100 parts by weight of blast furnace slag was received in a reaction tank, and 41.7 parts by weight of silica sand and 57.6 parts by weight of potassium carbonate were continuously added little by little while stirring the slag by blowing nitrogen gas from a stirring lance. Charged into. At this time, oxygen gas was blown in while continuously adding powdered coke little by little, and the temperature of the contents in the tank was about 140.
It was kept at 0 ° C., and potassium carbonate was melted and fused with the blast furnace slag. Then, the melted material subjected to the fusion treatment was discharged from the reaction tank, and the same operation as in Example 1 was performed to cool and solidify the melted material to form granules.

The results of analysis of this granular material are shown in Table 2. According to this analysis result, as in the case of Example 1, most of the potassium content was soluble in Ku, and the granular material could be supplied as a slow-release potassium fertilizer.

[0065]

[Table 1]

[0066]

[Table 2]

(Example 3) Using the molten desiliconized slag (composition shown in Table 1) and potassium carbonate, which were discharged from the hot metal pretreatment process in an iron mill, as raw materials, the method described with reference to FIG. Soluble potassium fertilizer was produced.

100 parts by weight of desiliconized slag was received in the reaction tank, and 41.3 parts by weight of potassium carbonate was continuously charged little by little while stirring the slag by blowing nitrogen gas from the stirring lance. During the charging of the potassium carbonate, oxygen gas was blown in while continuously adding powdered coke little by little so that the temperature of the contents in the tank was maintained at about 1400 ° C. to melt the potassium carbonate. And fused with desiliconized slag. Then, the melted material subjected to the fusion treatment was discharged from the reaction tank, and the same operation as in Example 1 was performed to cool and solidify the melted material to form granules.

The results of analysis of this granular material are shown in Table 2. According to this analysis result, as in the case of Example 1, most of the potassium content was soluble in Ku, and the granular material could be supplied as a slow-release potassium fertilizer.

(Example 4) In the presence of molten pig iron discharged from a blast furnace of an iron mill, fused blast furnace slag (composition is shown in Table 3) was fused with silica sand and potassium carbonate to produce a soluble potassium fertilizer. . In the implementation, a device having the same structure as that shown in FIG. 6 was used.

First, 100 parts by weight of blast furnace slag and 40 parts of hot metal
0 parts by weight was received in the reaction tank, nitrogen gas was blown from the stirring lance and the slag was stirred, and silica sand and potassium carbonate were continuously charged little by little, and 39.3 parts by weight of silica sand and 57.6 parts by weight were added. Parts of potassium carbonate were mixed. At this time, oxygen gas was blown in while continuously adding powdered coke little by little, and the temperature of the contents in the tank was about 140.
It was kept at 0 ° C. By adding the coke and blowing oxygen gas, the temperature of the contents in the tank was prevented from lowering, and the silica sand and potassium carbonate were melted.

When all the silica sand and potassium carbonate had fused with the blast furnace slag, only the fused melt that had been subjected to the fusion treatment was discharged from the reaction vessel and cooled to solidify. In this cooling and solidification treatment of the melt, an apparatus (a granulating apparatus) for blowing and cooling high-pressure air and granulating the melt was used to granulate the melt.

The results of analyzing potassium and silicic acid in this granular material are shown in Table 4. According to this analysis result, as in the case of Example 1, most of the potassium content was soluble in Ku, and the granular material could be supplied as a slow-release potassium fertilizer.

[0074]

[Table 3]

[0075]

[Table 4]

(Example 5) Ku-soluble potassium fertilizer was produced by the method described in FIGS. 7 and 8. The composition of the blast furnace slag was as shown in Table 3. Blowing silica sand at a rate of 2.0 t / hour while flowing molten pig iron (slag ratio = 0.32 (slag t / molten iron t)) discharged from the blast furnace into the gutter at a planned flow rate of 20 t / hour , Potassium carbonate 2.9t /
Blown at the rate of time. The blown silica sand and potassium carbonate melted. After receiving the molten pig iron with the additive blown into a ladle, the fused melt was separated and sent to a cooling and solidifying device to be solidified into particles.

The results of analyzing potassium and silicic acid in this granular material are shown in Table 4. According to this analysis result, as in the case of Example 1, most of the potassium content was soluble in Ku, and the granular material could be supplied as a slow-release potassium fertilizer.

[0078]

INDUSTRIAL APPLICABILITY The present invention is a method for producing a potash fertilizer which makes potash soluble by adding a potash raw material to a raw material melt containing predetermined components and fusing the potash raw material and the raw material melt.

The present invention also provides a method for producing a potassium fertilizer which makes potassium soluble in a soluble state by adding a potassium raw material to the above raw material melt in the presence of molten metal and fusing the potassium raw material and the raw material melt. is there.

According to the present invention, since one of the raw materials to be fused with the potassium raw material is a melt, the production of the fusible potassium fertilizer by fusion of the raw materials can be carried out extremely thermo-economically. Therefore, the amount of heat required to heat the raw material is greatly reduced, and the manufacturing cost can be significantly reduced.

Further, the Ku-soluble potassium compound can be produced only by adding the potassium raw material to the above raw material melt and fusing them, and the manufacturing process thereof becomes extremely simple. Can be drastically reduced.

Further, according to the present invention, since the fusion reaction of the potassium raw material and the raw material melt is performed in the presence of the molten metal having a large heat capacity, the heat is supplied through the molten metal. Therefore, the temperature fluctuation of the reaction product can be suppressed to be small, and it becomes easy to maintain the temperature of the fusion reaction within a predetermined range.

[Brief description of drawings]

FIG. 1 is a diagram showing a manufacturing process according to the invention of claim 1;

FIG. 2 is a diagram showing an example of an apparatus for carrying out the invention of claim 1;

FIG. 3 is a diagram showing another example of an apparatus for carrying out the invention of claim 1.

FIG. 4 is a diagram showing basic processing steps according to the invention of claim 2;

FIG. 5 is a diagram showing a treatment method in the case of repeatedly using the molten metal that was present when the potassium raw material and the raw material melt were fused.

FIG. 6 is a diagram showing an example of an apparatus for carrying out the invention of claim 2;

FIG. 7 is a plan view showing an example of an apparatus for carrying out the invention of claim 3;

FIG. 8 is a sectional view showing an example of an apparatus for carrying out the invention of claim 3.

[Explanation of symbols]

A, A ₁ , A ₂ , A ₃ fusion treatment process B, B ₁ , B ₂ , B ₃ fusion separation process C cooling and solidification process 10 reaction tank 14 agitation lance 15 potassium raw material injection lance 16 component adjustment agent injection Lance 17 Lance for blowing coke 18 Lance for oxygen 20 Potassium raw material hopper 21 Component adjuster hopper 22 Powder coke hopper 23, 24.25 Feeder 30 Main gutter 31 Weir 32 Slag gutter 50 Raw material melt 50a Blast furnace slag 51 Molten metal 51a Molten metal 52 fusion melt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Hosoda 1-1 Minamiwata-cho, Kawasaki-ku, Kawasaki City Nippon Kokan Techno Service Co., Ltd.

Claims (7)

[Claims] 1. CaO, MgO, Al ₂ O ₃ , Fe ₂ O
_A potassium raw material is added to a raw material melt containing one or more components selected from the group consisting of ₃ and SiO ₂ .
A method for producing a fusible potash fertilizer, comprising melting the potassium raw material to fuse it with the raw material melt, and then cooling and solidifying the fused melt. 2. CaO, MgO, in the presence of molten metal,
Melt raw material by adding a potassium raw material to a raw material melt containing one or more components selected from the group consisting of Al ₂ O ₃ and Fe ₂ O ₃ and SiO ₂ and melting the potassium raw material A method for producing a fusible potassium fertilizer, which is characterized in that the melted material is fused and then the melted material is taken out, cooled and solidified. 3. The method for producing a fusible potassium fertilizer according to claim 2, wherein the molten metal is hot metal. 4. A potassium raw material is added to a raw material melt, and when the potassium raw material is melted and fused with the raw material melt, a component modifier is added together with the potassium raw material. Item 4. A method for producing a black soluble potassium fertilizer according to any one of Items 3. 5. A potassium raw material is added to a raw material melt, and when the potassium raw material is melted and fused with the raw material melt, a carbon material is added together with the potassium raw material, and further oxygen gas or oxygen-containing gas is supplied. The method for producing a fusible potassium fertilizer according to any one of claims 1 to 3, wherein the raw material melt and the potassium raw material are heated by burning the carbonaceous material. 6. A potassium raw material is added to a raw material melt, and when the potassium raw material is melted and fused with the raw material melt, a component modifier and a carbon material are added together with the potassium raw material, and further oxygen gas or oxygen-containing material is added. The method for producing a fusible potash fertilizer according to any one of claims 1 to 3, wherein a raw material melt, a component modifier, and a potash raw material are heated by supplying gas to burn the carbon material. 7. The method for producing a fusible potassium fertilizer according to claim 1, wherein the raw material melt is a slag produced when the hot metal discharged from the blast furnace is subjected to a desiliconization process. .