CN111187088A - Technology for preparing high thermal shock magnesia raw material by compounding medium-grade magnesia and fused magnesia - Google Patents
Technology for preparing high thermal shock magnesia raw material by compounding medium-grade magnesia and fused magnesia Download PDFInfo
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- CN111187088A CN111187088A CN202010092370.8A CN202010092370A CN111187088A CN 111187088 A CN111187088 A CN 111187088A CN 202010092370 A CN202010092370 A CN 202010092370A CN 111187088 A CN111187088 A CN 111187088A
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 87
- 230000035939 shock Effects 0.000 title claims abstract description 36
- 239000002994 raw material Substances 0.000 title claims abstract description 32
- 238000005516 engineering process Methods 0.000 title claims abstract description 12
- 238000013329 compounding Methods 0.000 title claims abstract description 11
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 78
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 78
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 78
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 78
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 238000001354 calcination Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract 7
- 150000001875 compounds Chemical class 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 abstract description 6
- 238000003825 pressing Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000003628 erosive effect Effects 0.000 description 6
- 239000011819 refractory material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004321 preservation Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to a technology for preparing a high thermal shock magnesite raw material by compounding medium-grade magnesite and fused magnesite, which comprises the steps of crushing, fine grinding, mixing, ball pressing, drying and calcining. First, finely grinding medium magnesite powder with the MgO content of 95% to below 200 meshes, and crushing electric smelting magnesite with the MgO content of 97% to the granularity of 0.5-1 mm; placing the ground material into a mixer, adding Mg (OH) with a concentration of 0.75-1.25 mol/L2Mixing the sol for 10 min; pressing the mixed materials into balls, wherein the diameter of the magnesia balls is 40-80 mm; drying the magnesia balls until the moisture content is less than 1%; and placing the dried magnesite balls in a kiln for calcining to obtain the medium-grade magnesite fused magnesite compounded high-thermal shock magnesite raw material.
Description
Technical Field
The invention relates to the technical field of inorganic chemical industry, in particular to a technology for preparing a high thermal shock magnesite raw material by compounding medium-grade magnesite and fused magnesite.
Background
The refractory material is directly applied to the high-temperature industrial production process in various fields of steel, nonferrous metals, cement, glass, ceramics, chemical industry, machinery, electric power and the like, and is an essential basic material for ensuring the operation and the technical development of the industries. The magnesia has the advantages of high melting point, high temperature resistance, good alkali-resistant high-temperature slag corrosion resistance and the like, is one of the most important raw materials in refractory materials, is widely applied to various refractory materials for high-temperature industry, and has direct relation between the service performance and the service life of the refractory materials and the normal operation of the high-temperature industry and the final quality of products.
Fused magnesia and medium-grade magnesia are common magnesia refractory raw materials for preparing refractory products. The fused magnesia crystal grains have larger sizes and are more compact, so the fused magnesia crystal grains have larger volume density and strong resistance to the penetration of high-temperature slag. But the service life of the fused magnesia is limited due to poor thermal shock resistance of the fused magnesia. The medium-grade magnesite is special-grade magnesite and first-grade magnesite with 94-95% of MgO content, and is prepared by light burning, fine grinding, ball pressing and high-temperature vertical kiln sintering. However, the medium magnesia has low MgO content and low sintering temperature, so that the compactness of the medium magnesia is difficult to meet the requirement of high-performance products. During the use process, high-temperature molten slag easily directly permeates into the material through pores and crystal boundaries of the medium-grade magnesia to corrode the material, so that the service life of the refractory material is shortened.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a technology for preparing a high thermal shock magnesite raw material by compounding medium magnesite fused magnesite, which utilizes the complementary advantages of the fused magnesite and the medium magnesite to prepare a composite magnesite raw material with high thermal shock resistance and erosion resistance by compounding, and the medium magnesite powder, the fused magnesite, Mg (OH)2The sol is used as a raw material, and the high thermal shock magnesite raw material prepared by compounding medium-grade magnesite and fused magnesite is obtained by crushing, fine grinding, mixing, ball pressing, drying and calcining, so that the service life of the refractory material is prolonged.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a technology for preparing a high thermal shock magnesite raw material by compounding medium-grade magnesite and fused magnesite is characterized by comprising the following specific operation steps:
1) finely grinding 28-45 parts by weight of medium magnesia powder to below 200 meshes, and crushing 50-70 parts by weight of fused magnesia to the granularity of 0.5-1 mm;
2) putting the material obtained in the step 1) into a mixer2 to 5 weight portions of Mg (OH) with the concentration of 0.75 to 1.25mol/L22-5 parts of sol are uniformly mixed and are sequentially added into a mixer to be mixed for 8-10 min;
3) putting the mixed material into a ball press machine to press balls with the diameter of 40-80mm at 20-25MPa to obtain a magnesia ball green body;
4) drying the magnesia ball green body in a dryer at the temperature of 100-110 ℃ for 10-12h to obtain a dried magnesia ball green body;
5) and (3) calcining the dried magnesite ball green body in a kiln at 1450 and 1750 ℃ for 3-6 hours to obtain the compound high-thermal-shock magnesite raw material.
Carrying out high-grade magnesite powder high-grade high-.
The kiln in the step 5) is any one of a shaft kiln, a rotary kiln, an electric kiln or a tunnel kiln.
The raw material of the compound high thermal shock magnesite prepared by the technology of the invention is fused magnesite grains with medium magnesite fine powder and Mg (OH)2Combining sol; the fused magnesia particles can improve the erosion resistance of the magnesia raw material; the micropores in the medium-grade magnesite fine powder can improve the thermal shock resistance of the magnesite raw material; thereby the compound magnesite has good thermal shock resistance stability and erosion resistance.
Compared with the prior art, the invention has the beneficial effects that: 1) the invention takes middle-grade magnesite powder and fused magnesite as main raw materials, and directly prepares a compound high-thermal-shock magnesite raw material by crushing, fine grinding, mixing, ball pressing, drying and calcining; 2) the compound high-thermal-shock magnesite raw material prepared by the technology has the advantages of low production cost, good thermal shock resistance, easy popularization and implementation, energy conservation and environmental protection; 3) the thermal shock resistance of the compound magnesite is improved by the medium magnesite with a micropore structure, and the erosion resistance of the compound magnesite is enhanced by the high-density fused magnesite.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The preparation process of the present invention is further illustrated by the following examples:
example 1:
taking 45 parts of medium magnesia powder with the MgO content of 95.4 percent, 50 parts of electric melting magnesia with the MgO content of 97.2 percent and Mg (OH) with the concentration of 1.0mol/L25 parts of sol, and the specific operation steps are as follows:
finely grinding the medium-grade magnesia powder to below 200 meshes, and crushing the fused magnesia until the granularity is 0.5-1 mm; placing the above two materials into a mixer, adding Mg (OH)25 parts of sol are evenly divided, and the sol is sequentially added into a mixer and mixed for 10 min; putting the mixed material into a ball press machine to press balls under 20MPa, wherein the diameter of each ball is 40mm, and obtaining a magnesia ball green body; drying the magnesia ball green body in a dryer at 110 ℃ for 10h until the moisture content is less than 1 percent to obtain a dried magnesia ball green body; and (3) calcining the dried magnesite ball green body in a shaft kiln at 1450 ℃ for 3 hours to obtain the compound high-thermal-shock magnesite raw material.
Measuring the volume density of the sample according to GB/T2997-2000; the thermal shock resistance test is that a sample is directly placed into a furnace chamber at 1100 ℃ for heat preservation for 20 min, taken out and placed in normal-temperature circulating water for 3min, then taken out and placed naturally for 5min, and the process is repeated until the sample is broken or large blocks fall. The high thermal shock magnesite prepared in the embodiment has the bulk density of 3.17g/cm3And the thermal shock resistance times are 25 times.
Example 2:
taking 35 parts of medium magnesia powder with the MgO content of 95.7 percent, 60 parts of electric melting magnesia with the MgO content of 97.9 percent and Mg (OH) with the concentration of 0.75mol/L25 parts of sol, and the specific operation steps are as follows:
finely grinding the medium-grade magnesia powder to below 200 meshes, and crushing the fused magnesia until the granularity is 0.5-1 mm; placing the above two materials into a mixer, adding Mg (OH)25 parts of sol are evenly divided, and the sol is sequentially added into a mixer and mixed for 10 min; putting the mixed material into a ball press machine to press balls with the diameter of 40mm at 22.5MPa to obtain magnesia ball green bodies; drying the magnesia ball green body in a dryer at 110 ℃ for 10h until the moisture content is less than 1 percent to obtain a dried magnesia ball green body; and (3) calcining the dried magnesite ball green bodies in a vertical kiln at 1550 ℃ for 3 hours to obtain the compound high-thermal-shock magnesite raw material.
Measuring the volume density of the sample according to GB/T2997-2000; the thermal shock resistance test is that a sample is directly placed into a furnace chamber at 1100 ℃ for heat preservation for 20 min, taken out and placed in normal-temperature circulating water for 3min, then taken out and placed naturally for 5min, and the process is repeated until the sample is broken or large blocks fall. The high thermal shock magnesite prepared in the embodiment has the bulk density of 3.38g/cm3And the thermal shock resistance times are 23 times.
Example 3:
28 parts of medium magnesia powder with 96.1 percent of MgO content, 70 parts of electric melting magnesia with 98.5 percent of MgO content and 1.25mol/L Mg (OH)22 parts of sol, and the specific operation steps are as follows:
finely grinding the medium-grade magnesia powder to below 200 meshes, and crushing the fused magnesia until the granularity is 0.5-1 mm; placing the above two materials into a mixer, adding Mg (OH)2The sol is divided into 2 parts and then added into a mixer in sequence to be mixed for 10 min; putting the mixed material into a ball press machine to press balls under 25MPa, wherein the diameter of each ball is 40mm, and obtaining a magnesia ball green body; drying the magnesia ball green body in a dryer at 110 ℃ for 12h until the moisture content is less than 1 percent to obtain a dried magnesia ball green body; and placing the dried magnesite ball green bodies in a vertical kiln at 1650 ℃ for calcining for 3 hours to obtain the compound high-thermal-shock magnesite raw material.
Measuring the volume density of the sample according to GB/T2997-2000; the thermal shock resistance test is that a sample is directly placed into a furnace chamber at 1100 ℃ for heat preservation for 20 min, taken out and placed in normal-temperature circulating water for 3min, then taken out and placed naturally for 5min, and the process is repeated until the sample is broken or large blocks fall. The high thermal shock magnesite prepared in the embodiment has the bulk density of 3.41g/cm3And the thermal shock resistance times are 16 times.
The magnesia raw materials are prepared from the medium-grade magnesia and the fused magnesia respectively, so as to facilitate comparative analysis.
Comparative example 1:
finely grinding 28 parts of medium magnesia powder with the MgO content of 96.1 percent to below 200 meshes, and crushing 70 parts of medium magnesia with the MgO content of 96.1 percent to the granularity of 0.5-1 mm; putting the two materials into a mixer, dividing 2 parts of water into 2 times, adding into the mixer, and mixing for 10 min; putting the mixed material into a ball press machine to press balls under 25MPa, wherein the diameter of each ball is 40mm, and obtaining a magnesia ball green body; drying the magnesia ball green body in a dryer at 110 ℃ for 12h until the moisture content is less than 1 percent to obtain a dried magnesia ball green body; and (3) calcining the dried magnesia ball green body in a 1650 ℃ shaft kiln for 3 hours to obtain the magnesia raw material.
Measuring the volume density of the sample according to GB/T2997-2000; the thermal shock resistance test is that a sample is directly placed into a furnace chamber at 1100 ℃ for heat preservation for 20 min, taken out and placed in normal-temperature circulating water for 3min, then taken out and placed naturally for 5min, and the process is repeated until the sample is broken or large blocks fall. The volume density of the high thermal shock magnesite prepared by the comparative example is 3.08g/cm3And the thermal shock resistance times are 28 times.
Comparative example 2:
finely grinding 28 parts of fused magnesia with the MgO content of 98.5 percent to below 200 meshes, and crushing 70 parts of fused magnesia with the MgO content of 98.5 percent to the granularity of 0.5-1 mm; putting the two materials into a mixer, dividing 2 parts of water into 2 times, adding into the mixer, and mixing for 10 min; putting the mixed material into a ball press machine to press balls under 25MPa, wherein the diameter of each ball is 40mm, and obtaining a magnesia ball green body; drying the magnesia ball green body in a dryer at 110 ℃ for 12h until the moisture content is less than 1 percent to obtain a dried magnesia ball green body; and (3) calcining the dried magnesia ball green body in a 1650 ℃ shaft kiln for 3 hours to obtain the magnesia raw material.
Measuring the volume density of the sample according to GB/T2997-2000; the thermal shock resistance test is that a sample is directly placed into a furnace chamber at 1100 ℃ for heat preservation for 20 min, taken out and placed in normal-temperature circulating water for 3min, then taken out and placed naturally for 5min, and the process is repeated until the sample is broken or large blocks fall. The high thermal shock magnesite prepared by the comparative example has the bulk density of 3.44g/cm3And the thermal shock resistance times are 11 times.
Through the above examples 1-3 and comparative examples 1-2, it can be seen that the compound high thermal shock magnesite raw material prepared by the technology of the invention is prepared by adding medium-grade magnesite fine powder and Mg (OH) between fused magnesite particles2Combining sol; the fused magnesia particles can improve the erosion resistance of the magnesia raw material; the micropores in the medium-grade magnesite fine powder can improve the thermal shock resistance of the magnesite raw material; the compounded magnesite has good heat resistanceShock stability and erosion resistance, and can be suitable for various thermal shock resistant occasions.
Claims (3)
1. A technology for preparing a high thermal shock magnesite raw material by compounding medium-grade magnesite and fused magnesite is characterized by comprising the following specific operation steps:
1) finely grinding 28-45 parts by weight of medium magnesia powder to below 200 meshes, and crushing 50-70 parts by weight of fused magnesia to the granularity of 0.5-1 mm;
2) putting the material obtained in the step 1) into a mixer, and adding 2-5 parts by weight of Mg (OH) with the concentration of 0.75-1.25 mol/L22-5 parts of sol are uniformly mixed and are sequentially added into a mixer to be mixed for 8-10 min;
3) putting the mixed material into a ball press machine to press balls with the diameter of 40-80mm at 20-25MPa to obtain a magnesia ball green body;
4) drying the magnesia ball green body in a dryer at the temperature of 100-110 ℃ for 10-12h to obtain a dried magnesia ball green body;
5) and (3) calcining the dried magnesite ball green body in a kiln at 1450 and 1750 ℃ for 3-6 hours to obtain the compound high-thermal-shock magnesite raw material.
2. The technology for preparing the high thermal shock magnesite raw material by compounding the medium magnesite electric smelting magnesite according to claim 1, wherein the MgO content of the medium magnesite powder in step 1) is planted at 95%, the electric smelting magnesite is large crystal electric smelting magnesite produced by a large crystal electric smelting furnace, and the MgO content of the electric smelting magnesite is planted at 97%.
3. The technology for preparing the high thermal shock magnesite clinker raw material by compounding the medium-grade magnesite clinker and the electric smelting magnesite clinker as claimed in claim 1, wherein the kiln in the step 5) is any one of a shaft kiln, a rotary kiln, an electric kiln or a tunnel kiln.
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