Carbon-free ladle brick and preparation method thereof

Abstract

The invention discloses a carbon-free ladle brick and a preparation method thereof. The carbon-free ladle brick is prepared by using bauxite chamotte, a corundum raw material, magnesium oxide and alumina micro powder as main raw materials, adding iron oxide, a magnesium chloride solution, sodium hexametaphosphate and canary dextrin, mixing the above-mentioned materials by using special procedures, storing an obtained mixed for 30 min, carrying out compression molding and drying the mixture at a temperature of 200 DEG C for 24 h. According to the invention, iron oxide and alumina micro powder are enabled to exist in gaps between aggregate and powder and form hercynite with a low thermal expansion coefficient at a medium-high temperature, and no excess iron oxide enters into a matrix, which enables the ladle brick to have good high temperature stability and anti-stripping performance; therefore, the problem that molten steel carburetting caused by high temperature melting loss of a refractory brick influences smelting quality is overcome, and the prepared carbon-free ladle brick has excellent performances of high strength, washing resistance, a long service life, etc.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a carbon-free lining brick for a ladle and a preparation method thereof. Background technique [0002] As an important consumable material in the metallurgical industry, the ladle working layer material has always been highly valued by the refractory industry, and the refractory bricks used as the working layer are constantly being introduced. At present, carbon-containing bricks such as magnesia-carbon bricks, aluminum-magnesia-carbon bricks, etc. are used for ladle lining, which are unburned bricks made by adding graphite as one of the basic materials, adding some antioxidants, and combining with resin. Graphite and resin are expensive and need to be used at a constant temperature. In addition, the carbon content of molten steel caused by melting loss during the use of carbon-containing refractory materials is also a fundamental problem that cannot be solved by c...

AI Technical Summary

Problems solved by technology

However, at present, there are few public reports on the research and development and application technology of carbon-free ladle bricks. There are mainly problems such as simple combination form, poor combination of aggregate and powder, and easy separation under the impact of molten steel, resulting in a short service life of the ladle, thus limiting Popularization and application of carbon-free ladle brick