Bauxite base slight expansion high-alumina brick for ladle and method for producing the same

Abstract

The invention relates to a bauxite-based slight expansive high-alumina brick for ladles and a preparation method thereof and the material components and weight percentage are as follows: bauxite clinker between 5mm to 3mm accounting for 10 percent to 15 percent, bauxite clinker between 3mm to 1mm accounting for 20 percent to 30 percent, bauxite clinker between 1mm to 0mm accounting for10 percent to 20 percent, andanlusite less than 0.5mm accounting for 0 to 20 percent, sillimanite less than 0.088mm accounting for 0 to 15 percent, kyanite less than 0.2mm accounting for 0 to 10 percent, bauxite clinker less than 0.088mm accounting for 20 percent to 40 percent, Alpha-Al2O3 less than 320 mesh accounting for 0 to 5 percent and applied sulfurous acid paper pulp waste liquid accounting for 3 percent to 5 percent. The preparation method comprises the following steps: a. the bauxite clinker is crushed; b. the powders are magnetically selected; c. calendering is carried out on the bauxite clinker, the andanlusite, the sillimanite, the kyanite, the Alpha-Al2O3 and the applied sulfurous acid paper pulp waste liquid after mixing according to a ratio; d. the pug after calendering is shaped; e. the shaped pug is dried for 48hours; and f. the pug is sintered at the temperature of 1500 DEG C and the temperature is preserved for 6 to 8 hours. The preparation method can leads to the slight expansion of high-alumina bricks in use to avoid the flaking of bricks and the service life of bricks can be improved by 30 percent to 50 percent.

Description

technical field [0001] The invention belongs to a refractory material, in particular to an alumina-based micro-expansion high-alumina brick for a ladle and a manufacturing method thereof. Background technique [0002] Ladle is a kind of thermal equipment that receives molten steel from upstream steelmaking furnaces and transports molten steel to the refining equipment outside the furnace or the steel pouring site. With the development of refining outside the furnace, many molten steel refining processes are carried out in ladles. It makes the conditions of ladle use worse. The requirements for furnace lining refractory materials are even higher. Therefore, in order to adapt to the use conditions of the ladle and the requirements of users, after analyzing the original ladle brick system, it is found that the main problem causing the decline in the life of the ladle is that the original high alumina brick products are in use. The volume shrinkage will cause the brick joint to...

AI Technical Summary

Problems solved by technology

The requirements for furnace lining refractory materials are even higher. Therefore, in order to adapt to the use conditions of the ladle and the requirements of users, after analyzing the original ladle brick system, it is found that the main problem causing the decline in the life of the ladle is that the original high alumina brick products are in use. Volume shrinkage will cause the brick joints to expand, and the molten steel will corrode the product on both sides along the brick joints, resulting in uneven damage to the refractory bricks, increasing the area of ​​erosion and causing deterioration and peeling of the product