Rafractory for molten iron discharge channel of blast furnace

Abstract

The composition of refractory material for tapping spout includes (by weight portion) brown corundum aggregate formed from 12-14 portions of 8-5 mm aggregate, 16-18 portions of 5-3 mm aggregate, 23-25 portions of 3-1 mm aggregate and 13-15 portions of 1-0 mm aggregate, 14-16 portions of SiC (No.90), 3-5 portions of micropowder, 0.15 portion of metal aluminium powder, 1 portion of white mud, 6 portions of cement, 0.2 portion of sodium tripolyphosphate and 5-5.5 portions of water. Said invention fealures good erosion resistance, thermal shock-resisting stability and long service life, etc.

Description

(1).Technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a refractory material used for tapping troughs and flow nozzles of blast furnaces. (2). Background technology [0002] The refractory materials used in the tap trough and flow nozzle of the blast furnace casthouse need to have erosion resistance, thermal shock resistance stability, and corrosion resistance in order to ensure their long service life. Because increasing the strength of the refractory material can improve the erosion resistance and corrosion resistance of the material, but after increasing to a certain extent, the thermal shock resistance stability will decrease; increasing the amount of graphite added can improve the thermal shock resistance of the refractory material Stability and corrosion resistance, but if the content of graphite is more than 5%, its strength will drop sharply. Therefore, it is very difficult for the refractory materials use...

AI Technical Summary

Problems solved by technology

Because increasing the strength of the refractory material can improve the erosion resistance and corrosion resistance of the material, but after increasing to a certain extent, the thermal shock resistance stability will decrease; increasing the amount of graphite added can improve the thermal shock resistance of the refractory material Stability and corrosion resistance, but if the content of graphite is more than 5%, its strength will drop sharply

Therefore, it is very difficult for the refractory materials used in the casting trough and flow nozzle of the blast furnace casthouse to satisfy their excellent erosion resistance, thermal shock resistance stability, and corrosion resistance at the same time.