CN111995419A - Environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment and preparation method thereof - Google Patents
Environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment and preparation method thereof Download PDFInfo
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- CN111995419A CN111995419A CN202010911145.2A CN202010911145A CN111995419A CN 111995419 A CN111995419 A CN 111995419A CN 202010911145 A CN202010911145 A CN 202010911145A CN 111995419 A CN111995419 A CN 111995419A
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- 239000011449 brick Substances 0.000 title claims abstract description 81
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 238000002203 pretreatment Methods 0.000 title description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 24
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 23
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 20
- 239000010431 corundum Substances 0.000 claims abstract description 20
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 15
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 15
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 13
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 13
- 239000010439 graphite Substances 0.000 claims abstract description 13
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 13
- 239000011029 spinel Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 21
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 17
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 17
- 239000004917 carbon fiber Substances 0.000 claims description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 14
- 229910052580 B4C Inorganic materials 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 239000000025 natural resin Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000011863 silicon-based powder Substances 0.000 claims description 9
- 239000007767 bonding agent Substances 0.000 claims description 8
- 239000007800 oxidant agent Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000003628 erosive effect Effects 0.000 abstract description 7
- 239000002893 slag Substances 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 235000006708 antioxidants Nutrition 0.000 description 12
- 238000005245 sintering Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 239000013049 sediment Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- FGUJWQZQKHUJMW-UHFFFAOYSA-N [AlH3].[B] Chemical compound [AlH3].[B] FGUJWQZQKHUJMW-UHFFFAOYSA-N 0.000 description 3
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- 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
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- 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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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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- C04B2235/3817—Carbides
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- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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Abstract
The invention discloses an environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment and a preparation method thereof, and relates to the technical field of preparation of energy-saving and environment-friendly materials. The invention comprises an environment-friendly reinforced composite dephosphorization coating brick for molten iron pretreatment, which is prepared from the following raw materials in parts by weight: 8-12 parts of silicon carbide, 35-45 parts of compact corundum, 8-12 parts of natural crystalline flake graphite, 5-10 parts of zirconium corundum, 5-8 parts of high-purity carbon powder, 5-10 parts of fused magnesia-alumina spinel, 0.8-1 part of polycrystalline alumina fiber, 0.58-1.1 part of reinforcing agent, 3-3.5 parts of binding agent and 2.3-5.5 parts of antioxidant; the brick body for the dephosphorization bag can be rapidly and conveniently transported and has good erosion resistance and slag falling resistance.
Description
Technical Field
The invention relates to the technical field of preparation of energy-saving and environment-friendly materials, in particular to an environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment and a preparation method thereof.
Background
With the development of science and technology and the higher and higher requirements of users on the quality of steel, the lower and lower requirements on the phosphorus content in finished steel are met, and if the molten iron pretreatment dephosphorization process is not adopted, the iron ore with higher phosphorus content cannot be used as an iron smelting raw material or a high-specification steel grade with lower phosphorus content cannot be smelted.
Phosphorus is one of harmful impurities in steel, steel containing more phosphorus is easy to crack when used at room temperature or lower temperature, the [ P ] of a common stainless steel product is less than or equal to 0.035%, and the [ P ] of stainless steel resisting concentrated nitric acid is less than or equal to 0.005%. The dephosphorization pretreatment is carried out on the molten iron, so that the initial P content of the molten iron entering the converter (electric) furnace is reduced, and conditions are created for obtaining low P for the final steel billet.
The dephosphorization bag is used as a container for containing molten iron in the dephosphorization process, and the brick body used by the bag body can be contacted with the phosphorus-containing molten iron for a long time. In the process of using the dephosphorization package, the inner wall of the dephosphorization package can be severely corroded, so that the package body of the dephosphorization package is damaged on one hand, and a large amount of residues are generated at the same time. Meanwhile, in the process of preparing the brick body for the dephosphorization bag, after the brick body is formed by mechanical pressing, low-temperature heat treatment is required, so that the brick body can have certain initial strength and can meet the transportation requirement, and the efficiency of preparing and using the brick body is reduced.
Disclosure of Invention
The invention aims to provide an environment-friendly reinforced composite dephosphorization packet brick for molten iron pretreatment and a preparation method thereof, so as to realize the purposes that a brick body for a dephosphorization packet can be rapidly and conveniently transported and has good erosion resistance and slag falling resistance.
In order to achieve the purpose, the invention adopts the following technical means:
an environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment is prepared from the following raw materials in parts by weight: 8-12 parts of silicon carbide, 35-45 parts of compact corundum, 8-12 parts of natural crystalline flake graphite, 5-10 parts of zirconium corundum, 5-8 parts of high-purity carbon powder, 5-10 parts of fused magnesia-alumina spinel, 0.8-1 part of polycrystalline alumina fiber, 0.58-1.1 part of reinforcing agent, 3-3.5 parts of binding agent and 2.3-5.5 parts of antioxidant.
Preferably, the binder is a natural resin.
Further, the reinforcing agent is basf Auffict TEGO 80 and carbon fiber.
Furthermore, the weight portion of the Baschiff Auffict TEGO 800.08 is 0.1 portion, and the weight portion of the carbon fiber is 0.5 portion to 1 portion.
Furthermore, the antioxidant comprises 1-3 parts by weight of metal silicon powder, 1-2 parts by weight of metal aluminum powder and 0.3-0.5 part by weight of boron carbide.
Furthermore, the granularity of the silicon carbide is less than or equal to 200 meshes, and the content of SiC is more than or equal to 98 parts.
Meanwhile, the invention also discloses a preparation method of the environment-friendly reinforced composite dephosphorization coating brick for molten iron pretreatment, which comprises the following steps:
the method comprises the following steps:
(1) crushing silicon carbide, compact corundum, natural crystalline flake graphite, zirconia corundum and fused magnesia-alumina spinel, and mixing and stirring;
(2) adding natural resin as a bonding agent, and uniformly stirring the materials;
(3) adding metal silicon powder, metal aluminum powder and boron carbide as oxidants into the mixed material, and stirring and mixing uniformly;
(4) finally, adding high-purity carbon powder, polycrystalline alumina fiber, and basf Auffict TEGO 80 serving as a reinforcing agent and carbon fiber, and uniformly mixing;
(5) after the materials are mixed completely, the mixed materials are added into a press for machine pressing and forming.
Preferably, the mixing time in the step (5) is not less than 30 min.
The invention has the following beneficial effects:
1. the dephosphorizing coated brick material has excellent performances of high temperature resistance, erosion resistance and scouring resistance under the condition of considering low cost.
2. According to the principle that the raw materials of the refractory material are compact in bulk density, the dephosphorizing coated brick material is added with various proper additives to improve the service performance of the refractory material, and the aggregate gradation and the matrix gradation supplement each other and are synergistic.
3. The dephosphorizing coated brick material can meet the initial strength of transportation conditions only by mixing and then performing mechanical press molding, so that the time from preparation to transportation to a construction site of the brick material is greatly reduced.
4. The dephosphorizing coated brick material disclosed by the invention does not need heat treatment in the preparation process, the electricity cost or (gas) cost is reduced by 30-35%, the energy is saved, the consumption is reduced, and the production cost is further reduced.
5. The dephosphorizing coated brick material provided by the invention has the advantages of long service life and strong durability, and is not required to be repaired in the field use process, and can be used for off-line once, so that the labor intensity and the production cost of field workers are reduced, the working efficiency is improved, and the purchasing cost of a steel mill is reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
An environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment is prepared from the following raw materials in parts by weight: 8 parts of silicon carbide, 35 parts of compact corundum, 8 parts of natural crystalline flake graphite, 5 parts of zirconia corundum, 5 parts of high-purity carbon powder, 5 parts of fused magnesia-alumina spinel, 0.8 part of polycrystalline alumina fiber, 0.58 part of reinforcing agent, 3 parts of bonding agent and 2.3 parts of antioxidant.
Wherein the bonding agent is natural resin.
Meanwhile, the reinforcing agent is basf Auffict TEGO 80 and carbon fiber.
And, by weight parts, the basf affict TEGO 800.08 parts, the carbon fiber 0.5 part.
Furthermore, the antioxidant comprises 1 part of metal silicon powder, 1 part of metal aluminum powder and 0.3 part of boron carbide in parts by weight.
More specifically, the granularity of the silicon carbide is less than or equal to 200 meshes, and the content of SiC is more than or equal to 98 parts.
The environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment is prepared by the following steps:
(1) crushing silicon carbide, compact corundum, natural crystalline flake graphite, zirconia corundum and fused magnesia-alumina spinel, and mixing and stirring;
(2) adding natural resin as a bonding agent, and uniformly stirring the materials;
(3) adding metal silicon powder, metal aluminum powder and boron carbide as oxidants into the mixed material, and stirring and mixing uniformly;
(4) finally, adding high-purity carbon powder, polycrystalline alumina fiber, and basf Auffict TEGO 80 serving as a reinforcing agent and carbon fiber, and uniformly mixing;
(5) after the materials are mixed completely, the mixed materials are added into a press for machine pressing and forming.
Specifically, the mixing time in the step (5) is not less than 30 min.
In this embodiment, graphite carbon powder resists high temperature and resists the sediment and erode, and the anti erosion performance of the brick body is improved in the addition of the corundum-zirconia, and the ability that the brick body can the effectual anti sediment of improvement erodees is resisted to spinel, and metallic silicon and metallic aluminium boron carbide are as anti-oxidant, avoid appearing the condition of sintering damage in the brick body from the preparation completion back, the in-process of transporting to the scene and carrying out the sintering. And the carbon fiber and Auffict80 are added as auxiliary agents for increasing the strength and are matched with natural resin for use, so that the brick body can have certain initial strength after being subjected to mechanical pressing in the production process, and the brick can directly meet the transportation condition after being subjected to mechanical pressing. Moreover, the aluminum fiber increases the later sintering strength of the brick body on the construction site, so that the brick body can have higher strength after being sintered on the site. Meanwhile, the silicon carbide improves the thermal stability and the thermal conductivity of the brick body; the brick body can not be wetted by nonferrous metals; the anti-erosion performance of the brick body is improved; the thermal conductivity increases.
Therefore, compared with common aluminum carbon bricks and common magnesia carbon bricks, the brick body disclosed by the application does not need to be baked, can be used on site after being directly formed, is convenient to transport, can be transported after being formed by mechanical pressing, can have certain strength without being baked at low temperature, and avoids damage in the transportation process.
Example 2
An environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment is prepared from the following raw materials in parts by weight: 12 parts of silicon carbide, 45 parts of compact corundum, 12 parts of natural crystalline flake graphite, 10 parts of zirconia corundum, 8 parts of high-purity carbon powder, 10 parts of fused magnesia-alumina spinel, 1 part of polycrystalline alumina fiber, 1.1 parts of reinforcing agent, 3.5 parts of binding agent and 5.5 parts of antioxidant.
Wherein the bonding agent is natural resin.
Meanwhile, the reinforcing agent is basf Auffict TEGO 80 and carbon fiber.
And, by weight parts, the basf affict TEGO is 800.1 parts, and the carbon fiber is 1 part.
Furthermore, the antioxidant comprises 3 parts of metal silicon powder, 2 parts of metal aluminum powder and 0.5 part of boron carbide in parts by weight.
More specifically, the granularity of the silicon carbide is less than or equal to 200 meshes, and the content of SiC is more than or equal to 98 parts.
The environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment is prepared by the following steps:
(1) crushing silicon carbide, compact corundum, natural crystalline flake graphite, zirconia corundum and fused magnesia-alumina spinel, and mixing and stirring;
(2) adding natural resin as a bonding agent, and uniformly stirring the materials;
(3) adding metal silicon powder, metal aluminum powder and boron carbide as oxidants into the mixed material, and stirring and mixing uniformly;
(4) finally, adding high-purity carbon powder, polycrystalline alumina fiber, and basf Auffict TEGO 80 serving as a reinforcing agent and carbon fiber, and uniformly mixing;
(5) after the materials are mixed completely, the mixed materials are added into a press for machine pressing and forming.
Specifically, the mixing time in the step (5) is not less than 30 min.
In this embodiment, graphite carbon powder resists high temperature and resists the sediment and erode, and the anti erosion performance of the brick body is improved in the addition of the corundum-zirconia, and the ability that the brick body can the effectual anti sediment of improvement erodees is resisted to spinel, and metallic silicon and metallic aluminium boron carbide are as anti-oxidant, avoid appearing the condition of sintering damage in the brick body from the preparation completion back, the in-process of transporting to the scene and carrying out the sintering. And the carbon fiber and Auffict80 are added as auxiliary agents for increasing the strength and are matched with natural resin for use, so that the brick body can have certain initial strength after being subjected to mechanical pressing in the production process, and the brick can directly meet the transportation condition after being subjected to mechanical pressing. Moreover, the aluminum fiber increases the later sintering strength of the brick body on the construction site, so that the brick body can have higher strength after being sintered on the site. Meanwhile, the silicon carbide improves the thermal stability and the thermal conductivity of the brick body; the brick body can not be wetted by nonferrous metals; the anti-erosion performance of the brick body is improved; the thermal conductivity increases.
Therefore, compared with common aluminum carbon bricks and common magnesia carbon bricks, the brick body disclosed by the application does not need to be baked, can be used on site after being directly formed, is convenient to transport, can be transported after being formed by mechanical pressing, can have certain strength without being baked at low temperature, and avoids damage in the transportation process.
Example 3
An environment-friendly reinforced composite dephosphorization coated brick for molten iron pretreatment is prepared from the following raw materials in parts by weight: 10 parts of silicon carbide, 40 parts of compact corundum, 10 parts of natural crystalline flake graphite, 8 parts of zirconia corundum, 7 parts of high-purity carbon powder, 8 parts of fused magnesia-alumina spinel, 0.9 part of polycrystalline alumina fiber, 1 part of reinforcing agent and 3 parts of binding agent
2 parts of antioxidant and 5 parts of antioxidant.
Wherein the bonding agent is natural resin.
Meanwhile, the reinforcing agent is basf Auffict TEGO 80 and carbon fiber.
And, by weight parts, the basf affict TEGO 800.09 parts, the carbon fiber 0.91 part.
Furthermore, the antioxidant comprises 2.8 parts of metal silicon powder, 1.8 parts of metal aluminum powder and 0.4 part of boron carbide in parts by weight.
More specifically, the granularity of the silicon carbide is less than or equal to 200 meshes, and the content of SiC is more than or equal to 98 parts.
In this example, the preparation method was the same as that of example 1.
In this embodiment, graphite carbon powder resists high temperature and resists the sediment and erode, and the anti erosion performance of the brick body is improved in the addition of the corundum-zirconia, and the ability that the brick body can the effectual anti sediment of improvement erodees is resisted to spinel, and metallic silicon and metallic aluminium boron carbide are as anti-oxidant, avoid appearing the condition of sintering damage in the brick body from the preparation completion back, the in-process of transporting to the scene and carrying out the sintering. And the carbon fiber and Auffict80 are added as auxiliary agents for increasing the strength and are matched with natural resin for use, so that the brick body can have certain initial strength after being subjected to mechanical pressing in the production process, and the brick can directly meet the transportation condition after being subjected to mechanical pressing. Moreover, the aluminum fiber increases the later sintering strength of the brick body on the construction site, so that the brick body can have higher strength after being sintered on the site. Meanwhile, the silicon carbide improves the thermal stability and the thermal conductivity of the brick body; the brick body can not be wetted by nonferrous metals; the anti-erosion performance of the brick body is improved; the thermal conductivity increases.
Therefore, compared with common aluminum carbon bricks and common magnesia carbon bricks, the brick body disclosed by the application does not need to be baked, can be used on site after being directly formed, is convenient to transport, can be transported after being formed by mechanical pressing, can have certain strength without being baked at low temperature, and avoids damage in the transportation process.
Comparative example
A brick A sold in Shanxi brick factory was purchased as a comparative example.
By using the brick body and the brick body A disclosed by the invention at the same time on site, the brick body A needs to be replaced by the slag line brick twice in the process of completing dephosphorization operation for 160 times, and the brick body disclosed by the invention can directly complete dephosphorization operation for 160 times without replacing the slag line.
Therefore, the brick body has long service life, high strength, good slag resistance and strong erosion resistance.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (8)
1. The utility model provides a compound dephosphorization package brick is reinforceed to environmental protection type for molten iron preliminary treatment which characterized in that: the composition is prepared from the following raw materials in parts by weight: 8-12 parts of silicon carbide, 35-45 parts of compact corundum, 8-12 parts of natural crystalline flake graphite, 5-10 parts of zirconium corundum, 5-8 parts of high-purity carbon powder, 5-10 parts of fused magnesia-alumina spinel, 0.8-1 part of polycrystalline alumina fiber, 0.58-1.1 part of reinforcing agent, 3-3.5 parts of binding agent and 2.3-5.5 parts of antioxidant.
2. The environment-friendly reinforced composite dephosphorization ladle brick for molten iron pretreatment according to claim 1, wherein: the binding agent is natural resin.
3. The environment-friendly reinforced composite dephosphorization ladle brick for molten iron pretreatment according to claim 1, wherein: the reinforcing agent is basf affict TEGO 80 and carbon fiber.
4. The environment-friendly reinforced composite dephosphorization ladle brick for molten iron pretreatment according to claim 3, wherein: according to parts by weight, the basf Auffict TEGO 800.08-0.1 parts, and the carbon fiber 0.5-1 parts.
5. The environment-friendly reinforced composite dephosphorization ladle brick for molten iron pretreatment according to claim 1, wherein: the antioxidant comprises 1-3 parts by weight of metal silicon powder, 1-2 parts by weight of metal aluminum powder and 0.3-0.5 part by weight of boron carbide.
6. The environment-friendly reinforced composite dephosphorization ladle brick for molten iron pretreatment according to claim 1, wherein: the granularity of the silicon carbide is less than or equal to 200 meshes, and the SiC content is more than or equal to 98 parts.
7. The method for preparing the environmentally friendly reinforced composite dephosphorizing coated brick for molten iron pretreatment according to claim 1, which is characterized by comprising the following steps: the method comprises the following steps:
(1) crushing silicon carbide, compact corundum, natural crystalline flake graphite, zirconia corundum and fused magnesia-alumina spinel, and mixing and stirring;
(2) adding natural resin as a bonding agent, and uniformly stirring the materials;
(3) adding metal silicon powder, metal aluminum powder and boron carbide as oxidants into the mixed material, and stirring and mixing uniformly;
(4) finally, adding high-purity carbon powder, polycrystalline alumina fiber, and basf Auffict TEGO 80 serving as a reinforcing agent and carbon fiber, and uniformly mixing;
(5) after the materials are mixed completely, the mixed materials are added into a press for machine pressing and forming.
8. The method for preparing the environmentally friendly reinforced composite dephosphorizing coated brick for molten iron pretreatment according to claim 7, wherein the method comprises the following steps: the mixing time in the step (5) is not less than 30 min.
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Application publication date: 20201127 |