Alkaline stemming

Abstract

The invention relates to alkaline stemming which is prepared from the following raw materials: 25%-50% of sintered magnesia, 5%-20% of dust coke, 10%-25% of magnesium-carbon reclaimed material, 1%-10% of carbon-containing resin powder, 5%-10% of silicon carbide, 5%-10% of Jiaozuo clay, 1%-5% of alpha aluminum oxide, 5%-20% of light burning magnesium powder, 5%-10% of andalusite, and stemming-dedicated resin accounting for 10%-20% of the total weight of the raw materials. The alkaline stemming provided by the invention has the advantages of good plasticity and adhesion, appropriate porosity, slight volume expansion at high temperature, good sintering property, high strength, scouring resistance, erosion resistance, easiness in tapping and environmental friendliness, and does not discharge pollutant gas in the sintering process; the molten iron scouring resistance of the alkaline material is fully played, and the alkaline stemming does not bring pollution or harmful impurities to molten iron; the harmful impurities in the molten iron can be reduced to purify the molten iron; the harmful components such as phosphorus, sulfur and silicon in the molten iron are reduced; the alkaline stemming provided by the invention has the advantages of long service life, short sintering time, high strength and easiness in tapping, reduces the maintenance cost of an iron notch and is conducive to the stable operation and stable and high yield of a blast furnace.

Description

technical field

[0001] The invention relates to the field of metallurgical refractory materials, in particular to an alkaline gun mud for a blast furnace taphole. Background technique

[0002] In recent years, blast furnaces with different volumes have sprung up like mushrooms after rain, competing to adopt new technologies such as high wind pressure, high top pressure, high smelting strength, large air volume, and oxygen-enriched large injection. With the improvement of blast furnace equipment and smelting process, the utilization factor of blast furnace has been improved, the number of tapping times has increased, the tapping time has increased, and the amount of tapping has increased, which puts forward higher requirements for the quality of blast furnace taphole clay. The function of taphole mud is to fill up the taphole channel and form a mud bag in the hearth to maintain a sufficient depth of the taphole; at the same time, it should be easy to open and muddy, so as t...

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