STOPPER FOR PIG IRON TAP HOLE

摘要

PROBLEM TO BE SOLVED: To provide a stopper for a pig iron tap hole having good corrosion resistance to both molten pig iron and slag, and suitably usable to a medium to large size blast furnace.

SOLUTION: This stopper for a pig iron tap hole is formed by kneading a powder comprising refractory aggregate and refractory particulate with tar and/or a resin, where the composition of a powder portion with ≤45 μm particle size is made in a range of 3-50 mass% silicon carbide, 10-60 mass% silicon nitride and 0.2-10 mass% metallic aluminum, and the ratio of the powder portion with ≤45 μm particle size to the whole amount of the powder is made in a range of 25-70 mass%. Also aluminum oxide is blended in an amount of 2-20 mass%, in terms of Al2O3, to the whole amount of the powder.

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