Self-flow castable for filling back seam of side wall of aluminium electrolytic bath

Abstract

The invention discloses a self-flow castable capable of filling a seam between a shell and a side wall brick of an electrolytic bath, is designed special for an aluminium electrolytic bath and mainly comprises the following components: a carborundum material, a high alumina material, silica micropowderl, aluminium oxide powder and a calcium aluminate cement. The carborundum raw material used by the self-flow castable has high purity, high SiC content, relatively good bath electrolyte erosion resistance and compression strength; high heat conduction coefficients can eliminate a thermal barrierbetween the bath shell and the side wall brick and are favourable for promoting the forming of a side wall brick furnace upper; and good fluidity can guarantee that the castable uniformly fill the seam. Through the features, the self-flow castable can effectively prolong the service lives of the aluminium electrolytic bath and the side wall brick, is not limited by a construction space in castingconstruction, can quickly cast and is not fired at a high temperature in a production process. Therefore, the self-flow castable is a high-efficiency, energy-saving and environment-friendly refractory material.

Description

technical field [0001] The invention relates to a high-grade inorganic non-metallic material for filling the back seam of the side wall of an aluminum electrolytic cell, in particular to an amorphous refractory material mainly composed of silicon carbide material, high aluminum material, silicon micropowder, aluminum micropowder and calcium aluminate cement - Self-flowing castables. technical background [0002] As the main equipment of aluminum electrolysis, the service life of aluminum electrolytic cell is directly related to the development of the whole electrolytic aluminum industry. In China, silicon nitride combined with silicon carbide bricks are generally used as the side wall material of the aluminum electrolytic cell, and alumina powder is used as the back seam filling material of the side wall. In the side silicon carbide brick masonry, the traditional method is: (1) The vertical seam of the side block of the new tank is made of special SiC slurry for the aluminu...

AI Technical Summary

Problems solved by technology

[0003] Due to the small thermal conductivity of alumina powder, there will be a heat barrier during side heat dissipation, which will affect heat dissipation and the formation of the furnace side. The formation period of the furnace side is about 90 days, so that the side wall material is eroded by aluminum liquid and electrolyte for a long time, and Alumina powder cannot combine the side wall material with the tank shell, and cannot guarantee that the side wall material will leak aluminum due to the buoyancy of the aluminum liquid and electrolyte, which will affect the service life of the aluminum electrolytic cell