Refractory brick of ladle slag line

Abstract

The invention discloses a refractory brick of a ladle slag line. The refractory brick is prepared from the following raw materials in parts by weight: 24-26 parts of waste magnesia brick, 46-48 parts of fused magnesite, 1-2 parts of -20mesh graphite powder, 3-5 parts of -100mesh silicon carbide, 15-17 parts of -100mesh zirconium oxide, 6-8 parts of -150mesh fused millite, 8-10 parts of magnesite powder, 2-3 parts of asbestos fibers, 4-6 parts of Suzhou bentonite, 10-12 parts of zirconium boride, 1.5-2.5 parts of -200mesh boron nitride, 2.5-3.5 parts of -200mesh cerium oxide, 2-3 parts of asphalt powder, 1-2 parts of phenolic resin, 3-5 parts of sodium hexametaphosphate and 16-18 parts of water, wherein the waste magnesia brick of which the granularity is -20 mesh to +40 meshes accounts for 50%; the waste magnesia brick of which the granularity is -40 mesh to +100 meshes accounts for 25%; the waste magnesia brick of which the granularity is -100 mesh to +200 meshes accounts for 25%; the fused magnesite of which the granularity is -5 mesh to +18 meshes accounts for 35%; the fused magnesite of which the granularity is -18 mesh to +80 meshes accounts for 35%; and the fused magnesite of which the granularity is -80 mesh to +150 meshes accounts for 30%.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a ladle slag wire refractory brick. Background technique [0002] At present, the total carbon content of ordinary magnesia-carbon bricks for ladle slag line is generally 10-18wt%, and one of the main reasons for the damage of magnesia-carbon bricks is due to the oxidation of carbon in the bricks, so that steel slag is easy to penetrate, which makes the erosion intensified, but it has been The research carried out on low-carbon magnesia-carbon bricks mainly focuses on the research of binders and carbon raw materials, such as: "Magnesia-carbon bricks containing antioxidant C-TiN composite powder and its production method" disclosed in the Chinese patent application number 200610046434.0 "C-TiN composite powder is used as antioxidant and graphite, fused magnesia, and binder respectively after mixing, molding, and heat treatment to improve the slag resistance and p...

AI Technical Summary

Problems solved by technology

[0002] At present, the total carbon content of ordinary magnesia-carbon bricks for ladle slag line is generally 10-18wt%, and one of the main reasons for the damage of magnesia-carbon bricks is due to the oxidation of carbon in the bricks, so that steel slag is easy to penetrate, which makes the erosion intensified, but it has been The research carried out on low-carbon magnesia-carbon bricks mainly focuses on the research of binders and carbon raw materials, such as: "Magnesia-carbon bricks containing antioxidant C-TiN composite powder and its production method" disclosed in the Chinese patent application number 200610046434.0 "C-TiN composite powder is used as antioxidant and graphite, fused magnesia, and binder respectively after mixing, molding, and heat treatment to improve the slag resistance and prolong the service life. However, due to the high cost of titanium raw materials High, it is difficult to popularize and use, and the carbon content of the magnesia-carbon brick is high, it will add carbon to the molten steel; the application number is 200710019767.9 Chinese patent "a non-oxide composite low-carbon magnesia-carbon brick" introduces the magnesia-carbon Introducing non-oxides (nitrides or borides) into the bricks to prepare low-carbon magnesia-carbon bricks with a carbon content of less than 6%, which maintains the performance of high-carbon magnesia-carbon bricks, because it adds pre-synthesized non-oxidized The cost is high, and the hydration reaction may occur, and the performance improvement is not obvious; the application number is 99107800.4 Chinese patent "antioxidant for carbon-containing refractory materials" introduces an antioxidant, which consists of 0.15 to 10% (weight) Zinc powder or zinc powder and at least one of aluminum, magnesium, silicon, silicon calcium powder, silicon carbide, boron carbide, magnesium aluminum alloy powder, silicon nitride powder, wherein the zinc powder is ≥0.15%, and the particle size is less than 0.5mm , the addition of metal powder is only used to prevent the oxidation of carbon in carbon-containing refractory materials, and has no effect on the high-temperature mechanical properties of refractory materials