Method for preparing cast material of AL2O3-SiC-Ciron runner

Abstract

A process for preparing Al2O3-SiC-C refractory used for the tapping runner of blast furnace includes proportionally mixing electro-corundum, SiC, corundum powder, superfine powder, high-Al cement, silicon nitride, metallic silicon, disperser and water, casting, curing and drying.

Description

1. Technical field [0001] The invention belongs to the field of refractory materials. In particular, it relates to a method for preparing a refractory material for a blast furnace tapping trough. 2. Background technology [0002] The iron trough is a channel used to transport molten iron from the blast furnace to the ladle. During use, the inner lining of the iron ditch is subjected to the severe erosion of the ditch lining by the flowing high-temperature molten iron and slag, as well as the chemical erosion of the inner lining by the high-temperature slag, the penetration of molten iron, and the temperature suddenness of intermittent tapping and slag tapping. The cold and heat impact on the inner lining will cause cracks in the ditch lining. Therefore, it is generally required that the iron ditch lining refractory material has high high-temperature mechanical strength, good chemical corrosion resistance of slag and molten iron, strong oxidation resistance, and good therma...

AI Technical Summary

Problems solved by technology

However, since Al 2 o 3 - SiC introduced into SiC-C materials is a covalent compound with strong bonds prepared by electrofusion method. It is difficult to sinter and recrystallize under the conditions of use, and it still exists in an isolated state in the material; the commonly used CaO in cement binder and CaO in slag, and Al at high temperature 2 o 3 , SiO 2 Etc. will generate low-melting materials. As the temperature rises and the amount of CaO increases, the amount of liquid phase increases, which is not conducive to improving the high-temperature mechanical strength and slag erosion resistance of the material.