Alumina-silicon carbide-carbon refractory material preparation method

Abstract

The refractory Al-SiC-C material includes alumina, SiC and graphite on the carrier of bauxite, brown corundum or white corundum, and features that recovered, crushed and depurated waste furnace lining or inner container is used to replace partial bauxite, brown corundum or white corundum. The reused material results in alumina content accounting for not more than 30 %, and has grain size below 8 mm and water content not more than 0.5 %. The present invention solves the technological problem of utilizing waste Al-SiC-C brick to replace new material without affecting the furnace life.

Description

Technical field: [0001] The invention relates to a refractory material for a molten iron pretreatment smelting vessel, in particular to a method for producing an alumina-silicon carbide-carbon refractory material by using discarded alumina-silicon carbide-carbon bricks. Background technique: [0002] In order to achieve the purification, upgrading and cost reduction of steelmaking, steel mills adopt the hot metal pretreatment method, that is, the hot metal is sent from the blast furnace to the steelmaking furnace for pretreatment such as desiliconization, dephosphorization and desulfurization. The lining refractory material of the container used for pretreatment (such as mixed iron car, ladle, torpedo tank) must consider the erosion caused by the above pretreatment. The unburned brick made of aluminum-silicon carbide-carbon refractory is an excellent refractory material because of its good chemical corrosion resistance, thermal shock resistance, mechanical erosion resistance...

AI Technical Summary

Problems solved by technology

After reaching the age of the furnace, the treatment container needs to be repaired, and the old inner lining that has been dismantled is discarded. In the long run, these discarded refractory materials are piled up like a mountain, which not only occupies land, but also causes environmental pollution, becoming a big burden for steel enterprises

On the other hand, the refractory material factory is disturbed by the rise in raw material prices and production costs, and on the contrary, the sales price of products has been suppressed and dropped.