CN115536410A - Low-carbon magnesia carbon brick and preparation method thereof - Google Patents
Low-carbon magnesia carbon brick and preparation method thereof Download PDFInfo
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Abstract
The invention provides a low-carbon alumina-magnesia carbon brick and a preparation method thereof, wherein the low-carbon alumina-magnesia carbon brick is prepared from the following raw materials in parts by weight: 50-70 parts of high bauxite, 10-20 parts of fused magnesia, 15-25 parts of aluminum-magnesium spinel powder, 4-6 parts of aluminum-calcium slag powder, 0.5-1 part of graphite, 2-4 parts of activated alumina micropowder, 0.2-0.4 part of silicon nitride, 8-10 parts of phenolic resin and 0.2-0.4 part of sodium dodecyl benzene sulfonate; the purposes of improving the erosion resistance, the thermal shock resistance and the slag resistance of the low-carbon alumina-magnesia carbon brick are realized by optimizing the raw material components of the low-carbon alumina-magnesia carbon brick and selecting a novel additive.
Description
Technical Field
The invention relates to a shaped refractory material in the technical field of refractory material preparation, in particular to a low-carbon alumina-magnesia-carbon brick and a preparation method thereof.
Background
The alumina-magnesia-carbon brick is a fire-lined product which is made by turning special-grade high-alumina bauxite or corundum sand, magnesia and flaky graphite serving as main raw materials. It is characterized by that it not only possesses the advantages of high erosion resistance and non-peeling property due to carbon-contained material, but also possesses the advantage of high residual linear expansion rate due to the fact that it can be heated to produce spinel when it is used, so that it can be made into the invented high-quality lining brick. It has better slag corrosion resistance and thermal shock resistance, and has micro-scale re-burning expansion. The alumina-magnesia-carbon brick has the advantages of corrosion resistance, stripping resistance, balanced corrosion, safe use, less steel and slag adhesion, easy unpacking and the like. The method is mainly used for the lining of the molten steel tank with harsh use conditions. The inner linings of alumina-magnesia carbon bricks are increasingly used at the molten pool part and the ladle bottom part of a continuous casting large-scale tundish and an external refining ladle.
In the prior art, the ladle low-carbon composite refractory material has some defects in the refining production of the ladle, such as: the slag resistance, the thermal shock resistance and the service life of the alloy are still to be improved. The raw material composition needs to be further optimized in the refining process of the molten steel.
Disclosure of Invention
The invention aims to provide a low-carbon alumina-magnesia carbon brick and a preparation method thereof, which aim to improve the corrosion resistance, the thermal shock resistance and the slag resistance of the low-carbon alumina-magnesia carbon brick by optimizing the raw material components of the low-carbon alumina-magnesia carbon brick and selecting a novel additive.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-carbon alumina-magnesia carbon brick is prepared from the following raw materials in parts by weight: 50-70 parts of high bauxite, 10-20 parts of fused magnesia, 15-25 parts of aluminum-magnesium spinel powder, 4-6 parts of aluminum-calcium slag powder, 0.5-1 part of graphite, 2-4 parts of activated alumina micropowder, 0.2-0.4 part of silicon nitride, 8-10 parts of phenolic resin and 0.2-0.4 part of sodium dodecyl benzene sulfonate;
the high bauxite has the grain size distribution as follows: 10-15 parts of high bauxite with the granularity of more than or equal to 3mm and less than 5mm; 15-20 parts of high bauxite with the granularity of less than or equal to 1mm and less than 3 mm; 22-25 parts of bauxite with the granularity smaller than 1 mm;
the grain size distribution of the fused magnesia is as follows: 5-10 parts of fused magnesia with the granularity of not more than 3mm and less than 5mm; 10-15 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm; 15-20 parts of fused magnesia with the granularity less than 1 mm.
The granularity of the aluminum-magnesium spinel powder is less than or equal to 0.15mm; the granularity of the aluminum-calcium slag powder is less than or equal to 0.15mm; the granularity of the activated alumina micro powder is less than or equal to 0.008mm.
2-4 parts of rare earth oxide is also added into the raw material components.
10-15 parts of corundum fine powder is also added into the raw material components, and the granularity of the corundum fine powder is less than or equal to 0.15mm.
The preparation method of the low-carbon alumina-magnesia-carbon brick comprises the following steps:
1) Firstly, premixing high bauxite, fused magnesia, aluminum-magnesium spinel powder, graphite and activated alumina micro powder in raw materials, and uniformly mixing; then adding high-alumina bauxite, fused magnesia and granular raw materials, and uniformly mixing;
2) Adding phenolic resin and sodium dodecyl benzene sulfonate, mixing, and molding in a brick press to obtain green bricks;
3) And melting the mixture of the aluminum calcium slag powder and the silicon nitride into liquid, and pouring the liquid on the outer surface of the green brick to obtain a finished product.
Compared with the prior art, the invention has the beneficial effects that:
by optimizing the components of the raw materials and adding the composite additive, the product has excellent slag resistance and thermal shock stability, and the method comprises the following steps:
1) The low-carbon phosphorus-free magnesia-alumina unburned brick is adopted, so that the problem of recarburization of molten steel is avoided, and the phosphorus pollution of the molten steel is eliminated.
2) The density and the thermal shock stability of the material are improved by adding the composite additive.
3) The use of the ultrafine raw materials promotes the sintering of the product in the production process, reduces the heat loss and avoids the recarburization of molten steel.
4) And melting the mixture of the aluminum calcium slag powder and the silicon nitride into liquid, and pouring the liquid on the outer surface of the green brick to obtain a finished product. The manufacturing method enables the covering layer to be formed outside the green brick, enables the combination of all components to be tougher, improves the strength and the thermal shock resistance of the product, and enables the product to have very good slag resistance and scouring resistance. Greatly improving the service life of the product.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
Example 1:
a low-carbon alumina-magnesia carbon brick is prepared from the following raw materials in parts by weight: 51 parts of high bauxite, 12 parts of fused magnesia, 16 parts of aluminum-magnesium spinel powder, 5 parts of aluminum-calcium slag powder, 0.5 part of graphite, 2.1 parts of active alumina micro powder, 0.25 part of silicon nitride, 8 parts of phenolic resin and 0.23 part of sodium dodecyl benzene sulfonate;
the high bauxite has the following grain size composition: 11 parts of high bauxite with the granularity of more than or equal to 3mm and less than 5mm; 16 parts of high bauxite with the granularity of more than or equal to 1mm and less than 3 mm; 23 parts of high bauxite with the granularity less than 1 mm;
the grain size distribution of the fused magnesia is as follows: 6 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5mm; 12 parts of fused magnesia with the granularity of less than or equal to 1mm and less than 3 mm; 16 portions of fused magnesia with the granularity less than 1 mm.
The granularity of the aluminum-magnesium spinel powder is less than or equal to 0.15mm; the granularity of the aluminum-calcium slag powder is less than or equal to 0.15mm; the granularity of the active alumina micro powder is less than or equal to 0.008mm.
The preparation method of the low-carbon alumina-magnesia-carbon brick comprises the following steps:
1) Firstly, premixing high bauxite, fused magnesia, aluminum-magnesium spinel powder, graphite and active alumina micro powder in raw materials, and uniformly mixing; then adding high-alumina bauxite, fused magnesia and granular raw materials, and uniformly mixing;
2) Adding phenolic resin and sodium dodecyl benzene sulfonate, mixing, and molding in a brick press to obtain green bricks;
3) And melting the mixture of the aluminum calcium slag powder and the silicon nitride into liquid, and pouring the liquid on the outer surface of the green brick to obtain a finished product.
Example 2:
a low-carbon alumina-magnesia carbon brick is prepared from the following raw materials in parts by weight: 60 parts of high-alumina bauxite, 15 parts of fused magnesia, 18 parts of aluminum-magnesium spinel powder, 5 parts of aluminum-calcium slag powder, 0.6 part of graphite, 3 parts of activated alumina micro powder, 0.27 part of silicon nitride, 9 parts of phenolic resin and 0.3 part of sodium dodecyl benzene sulfonate; 3 parts of rare earth oxide lanthanum oxide powder.
The high bauxite has the following grain size composition: 14 parts of high bauxite with the granularity of more than or equal to 3mm and less than 5mm; 17 parts of high bauxite with the granularity of less than or equal to 1mm and less than 3 mm; 23 parts of high bauxite with the granularity of less than 1 mm;
the grain size distribution of the fused magnesia is as follows: 8 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5mm; 12 parts of fused magnesia with the granularity of less than or equal to 1mm and less than 3 mm; 18 portions of fused magnesia with granularity less than 1 mm.
The granularity of the aluminum-magnesium spinel powder is less than or equal to 0.15mm; the granularity of the aluminum-calcium slag powder is less than or equal to 0.15mm; the granularity of the activated alumina micro powder is less than or equal to 0.008mm; the particle size of the rare earth oxide lanthanum oxide powder is less than or equal to 0.008mm;
the preparation method of the low-carbon alumina-magnesia-carbon brick comprises the following steps:
1) Firstly, premixing high bauxite, fused magnesia, aluminum-magnesium spinel powder, graphite, active alumina micro powder and lanthanum oxide powder in raw materials, and uniformly mixing; then adding high-alumina bauxite, fused magnesia and granular raw materials, and uniformly mixing;
2) Adding phenolic resin and sodium dodecyl benzene sulfonate, mixing, and molding in a brick press to obtain green bricks;
3) And melting the mixture of the aluminum calcium slag powder and the silicon nitride into liquid, and pouring the liquid on the outer surface of the green brick to obtain a finished product.
Example 3:
a low-carbon alumina-magnesia carbon brick is prepared from the following raw materials in parts by weight: 55 parts of high-alumina bauxite, 12 parts of fused magnesia, 20 parts of aluminum-magnesium spinel powder, 5 parts of aluminum-calcium slag powder, 0.8 part of graphite, 3 parts of activated alumina micro powder, 0.3 part of silicon nitride, 9 parts of phenolic resin and 0.2 part of sodium dodecyl benzene sulfonate; 2 parts of rare earth oxide lanthanum oxide powder and 12 parts of corundum fine powder.
The high bauxite has the following grain size composition: 12 parts of high bauxite with the granularity of more than or equal to 3mm and less than 5mm; 16 parts of high bauxite with the granularity of more than or equal to 1mm and less than 3 mm; 23 parts of high bauxite with the granularity less than 1 mm;
the grain size distribution of the fused magnesia is as follows: 6 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5mm; 12 parts of fused magnesia with the granularity of less than or equal to 1mm and less than 3 mm; 16 portions of fused magnesia with granularity less than 1 mm.
The granularity of the aluminum-magnesium spinel powder is less than or equal to 0.15mm; the granularity of the aluminum-calcium slag powder is less than or equal to 0.15mm; the granularity of the corundum fine powder is less than or equal to 0.15mm; the granularity of the active alumina micro powder is less than or equal to 0.008mm; the granularity of the rare earth oxide lanthanum oxide powder is less than or equal to 0.008mm.
The preparation method of the low-carbon alumina-magnesia-carbon brick comprises the following steps:
1) Firstly, premixing high bauxite, fused magnesia, aluminum-magnesium spinel powder, corundum fine powder, graphite, rare earth oxide lanthanum oxide powder and active alumina micro powder in raw materials, and uniformly mixing; then adding high-alumina bauxite, fused magnesia and granular raw materials, and uniformly mixing;
2) Adding phenolic resin and sodium dodecyl benzene sulfonate, mixing, and molding in a brick press to obtain green bricks;
3) And melting the mixture of the aluminum calcium slag powder and the silicon nitride into liquid, and pouring the liquid on the outer surface of the green brick to obtain a finished product.
Claims (4)
1. The low-carbon alumina-magnesia carbon brick is characterized by being prepared from the following raw materials in parts by weight: 50-70 parts of high bauxite, 10-20 parts of fused magnesia, 15-25 parts of aluminum-magnesium spinel powder, 4-6 parts of aluminum-calcium slag powder, 0.5-1 part of graphite, 2-4 parts of activated alumina micropowder, 0.2-0.4 part of silicon nitride, 8-10 parts of phenolic resin and 0.2-0.4 part of sodium dodecyl benzene sulfonate;
the high bauxite has the following grain size composition: 10-15 parts of high bauxite with the granularity of more than or equal to 3mm and less than 5mm; 15-20 parts of high bauxite with the granularity of more than or equal to 1mm and less than 3 mm; 22-25 parts of high bauxite with the granularity less than 1 mm;
the grain size distribution of the fused magnesia is as follows: 5-10 parts of fused magnesia with the granularity of not more than 3mm and less than 5mm; 10-15 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm; 15-20 parts of fused magnesia with the granularity less than 1 mm.
The granularity of the aluminum-magnesium spinel powder is less than or equal to 0.15mm; the granularity of the aluminum-calcium slag powder is less than or equal to 0.15mm; the granularity of the active alumina micro powder is less than or equal to 0.008mm.
2. The brick of claim 1, wherein 2-4 parts of rare earth oxide is further added to the raw material components.
3. The low carbon alumina magnesia carbon brick according to claim 1 or 2, characterized in that 10-15 parts of corundum fine powder is added into the raw material components, and the granularity of the corundum fine powder is less than or equal to 0.15mm.
4. The method of any one of claims 1 to 3, comprising the steps of:
1) Firstly, premixing high bauxite, fused magnesia, aluminum-magnesium spinel powder, graphite and active alumina micro powder in raw materials, and uniformly mixing; then adding high-alumina bauxite, fused magnesia and granular raw materials, and uniformly mixing;
2) Adding phenolic resin and sodium dodecyl benzene sulfonate, mixing, and molding in a brick press to obtain green bricks;
3) And melting the mixture of the aluminum calcium slag powder and the silicon nitride into liquid, and pouring the liquid on the outer surface of the green brick to obtain a finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211310028.6A CN115536410A (en) | 2022-10-25 | 2022-10-25 | Low-carbon magnesia carbon brick and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211310028.6A CN115536410A (en) | 2022-10-25 | 2022-10-25 | Low-carbon magnesia carbon brick and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116813317A (en) * | 2023-07-26 | 2023-09-29 | 海城利尔麦格西塔材料有限公司 | Low-carbon aluminum-magnesia carbon brick and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103467120A (en) * | 2013-08-29 | 2013-12-25 | 浙江长兴强立耐火材料有限公司 | Non-phosphorus and low-carbon alumina-magnesia unburned brick for stainless steel ladle and manufacturing method of brick |
| CN113213897A (en) * | 2021-06-23 | 2021-08-06 | 郑州振东科技有限公司 | Steel ladle low-carbon aluminum-magnesium-carbon brick |
| CN113292321A (en) * | 2021-06-23 | 2021-08-24 | 郑州振东科技有限公司 | Steel ladle low-carbon working lining brick |
| CN114368959A (en) * | 2022-02-08 | 2022-04-19 | 邓晶晶 | Anti-impact corrosion-resistant ceramic tile and preparation method thereof |
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2022
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103467120A (en) * | 2013-08-29 | 2013-12-25 | 浙江长兴强立耐火材料有限公司 | Non-phosphorus and low-carbon alumina-magnesia unburned brick for stainless steel ladle and manufacturing method of brick |
| CN113213897A (en) * | 2021-06-23 | 2021-08-06 | 郑州振东科技有限公司 | Steel ladle low-carbon aluminum-magnesium-carbon brick |
| CN113292321A (en) * | 2021-06-23 | 2021-08-24 | 郑州振东科技有限公司 | Steel ladle low-carbon working lining brick |
| CN114368959A (en) * | 2022-02-08 | 2022-04-19 | 邓晶晶 | Anti-impact corrosion-resistant ceramic tile and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116813317A (en) * | 2023-07-26 | 2023-09-29 | 海城利尔麦格西塔材料有限公司 | Low-carbon aluminum-magnesia carbon brick and preparation method thereof |
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