Method for preparing electro-fused magnesia alumina spinel

Abstract

This invention relates to a method for producing electro-melting magnesium aluminate spinel by applying used Mg-Al carbon bricks. The procedures comprise: mix 45-100wt% used Mg-Al carbon bricks with 0-55wt% bauxite powder and put the mixture in the electric arc furnace for electric melting at 1800-3000Deg C, after cooling pull it out for disintegrating and separating. The main chemical composition of the used Mg-Al carbon bricks at weight ratio is: Al2O3 50-75%, MgO 5-30%, and C 2-20%.This invention applies the C in the used Mg-Al carbon bricks as reducing agent and steel in the used Mg-Al carbon bricks as clarifying agent to remove the impurity oxidate substances like SiO2, Fe2O3 and TiO2 during the melting process, so as to obtain the electro-melting magnesium aluminate spinel. This invention can turn waste to be useful and decrease environmental pollution.

Description

1. Technical field [0001] The invention belongs to the technical field of preparing fused magnesia-aluminum spinel refractory materials. In particular, it relates to a method for preparing fused magnesia-aluminum spinel by utilizing the used alumina-magnesia-carbon brick. 2. Background technology [0002] The iron and steel industry is the industry that consumes the most refractory materials. It accounts for more than 70% of refractory materials. Recently, my country's iron and steel industry has developed rapidly, and it is estimated that it will reach 400 million tons in 2006. Calculated on the basis of 40 kilograms of refractory materials per ton of steel, the annual consumption of refractory materials is about 16 million tons, and the refractory materials that are actually eroded by slag only account for about 35% of the total. That is, about 10 million tons of refractory materials are discarded every year, which not only causes waste of resources, but also pollutes t...

AI Technical Summary

Problems solved by technology

Except for a small amount of used alumina-magnesia-carbon bricks that are broken and mixed into alumina-magnesia-carbon bricks, a large number of used alumina-magnesia-carbon bricks are piled up like mountains, which wastes resources and pollutes the environment.