Alumina-magnesite carbon brick for 300t steel ladle impact region and preparation method thereof

Abstract

The invention relates to an alumina-magnesite carbon brick for a 300t steel ladle impact region. The brick is obtained by using brown aluminum oxide, fused magnesite, dicalcium high-purity magnesia, crystalline flake graphite, carbon black and metal aluminum powder as raw materials, adding resin powder and phenolic resin into the raw materials, performing uniform mixing and performing baking afterpressing shaping, wherein the brown aluminum oxide and dicalcium high-purity magnesia have the independent particle diameter grading respectively; the brown aluminum oxide has the four stages of grading which are respectively 5 to 3 mm, 3 to 1 mm, 1 to 0 mm and at most 0.074 mm; the dicalcium high-purity magnesia has two stages of grading which are respectively 1 to 0 mm and at most 0.074 mm. Thebrown aluminum oxide and the dicalcium high-purity magnesia at different particle diameter grading are used as main bodies; the fused magnesite, the medical aluminum powder, the crystalline flake graphite and the carbon black are used as auxiliary materials and are mixed; then, the resin powder and the phenolic resin are added for pressing; drying is performed at a certain process curve, so thatthe pore rate is effectively reduced; the volume density and the pressure-resistant intensity of the alumina-magnesite carbon brick are improved; the service life is further prolonged.

Description

technical field [0001] The invention relates to a ladle lining brick in the field of refractory materials, in particular to an aluminum-magnesium-carbon brick for a 300-ton ladle impact zone and a preparation method thereof. Background technique [0002] Alumina-magnesia-carbon bricks refer to refractory products made of super-grade high-alumina bauxite or corundum sand, magnesia and flake graphite as the main raw materials. In addition to the advantages of high corrosion resistance and not easy to peel off due to carbon content at high temperatures, alumina-magnesia-carbon bricks also have the advantages of high residual linear expansion due to the formation of spinel when heated during use, and excellent thermal shock Stability and good impact resistance, so it becomes a newly developed high-quality lining brick. [0003] Alumina-magnesia-carbon bricks are mainly used for the inner lining of ladles with harsh service conditions. The purpose is to avoid the situation that ...

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Problems solved by technology

[0005] In order to solve the problem that the existing aluminum-magnesia-carbon bricks are washed too fast and have short service life when used in the impact area of ​​a 300-ton ladle, the present invention provides an aluminum-magnesia-carbon brick for a 300-ton ladle impact area and a preparation method thereof. Brown corundum and dicalcium high-purity magnesia with different particle size distribution as the main body, supplemented with fused magnesia, metal aluminum powder, flake graphite and carbon black, then mixed with resin powder and phenolic resin for pressing and baked with a certain process curve It is made dry, which effectively reduces the porosity, improves the bulk density and compressive strength of alumina-magnesia-carbon bricks, and thus improves its service life

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