Profiled si3 N4 combined SiC brick for aluminium electrolysis bath side wall

Abstract

A shaped Si3N4-SiC brick used for side wall of aluminium electrolyzer features that on its non-working surface with larger area there is a right-angle trapezoidal boss for isolating the refractory carbon brick from high-temp air, so elongating its service life.

Description

Technical field: [0001] The invention relates to a special-shaped Si for the side wall of a high-temperature furnace body aluminum electrolytic cell 3 N 4 Combining SiC brick refractory bricks belongs to the technical field of refractory material preparation. Background technique [0002] The refractory materials currently used in the side walls of the aluminum reduction cell are carbonaceous refractory bricks, silicon nitride combined silicon carbide refractory bricks, silicon nitride combined silicon carbide refractory bricks and carbonaceous refractory bricks. Carbon refractory bricks are easily damaged by high temperature oxidation, resulting in short life of aluminum electrolytic cell side walls and large power loss due to leakage; the oxidation resistance of silicon nitride combined with silicon carbide refractory bricks is better than that of carbon refractory bricks and cryolite The electrolyte melt has the advantages of better corrosion ability, better electrical insulat...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of abnormal oxidation and damage of the carbonaceous refractory brick existing on the top of the brick structure of the existing plane-pasted composite silicon nitride bonded silicon carbide refractory brick and carbonaceous refractory brick, and propose a method that can Effectively insulate the top of carbon refractory bricks from high-temperature air and avoid the oxidation of carbon refractory bricks. Special-shaped Si for aluminum electrolytic cell side walls 3 N 4 Combined with SiC bricks,

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