Foundry ladle covering agent

Abstract

The invention provides a foundry ladle covering agent. 100 parts of the foundry ladle covering agent comprise 45-70 parts of power plant gas ash, 10-35 parts of limestone, 10-30 parts of vermiculite and 0-10 parts of fluorite. The main raw materials adopted by the foundry ladle covering agent have the advantages of low cost, low sulfur content and less secondary pollution; the foundry ladle covering agent has a suitable melting point, a short melting time and a good spreadability; and limestone decomposes at 800-1200DEG C, foams and expands, vermiculite expands at a high temperature, and simultaneously the friction force among solid particles is less than the internal friction force among powders, so the spreadability and the heat insulating property are good. The foundry ladle covering agent can prevent the secondary oxidation and the too large temperature decrease of molten iron.

Description

Technical field [0001] The invention belongs to the field of ironmaking, and particularly relates to a ladle covering agent. Background technique [0002] The molten iron smelted from the blast furnace is transported to the steel plant by using a molten iron ladle. Due to the low temperature of the molten iron, the temperature drop occurs during the transportation of the molten iron ladle, and the molten iron is secondarily oxidized in the exposed air. At present, the covering agent used by some enterprises appears The spreadability is not good, and the problems of heat preservation and reduction of secondary oxidation are not raised. At present, carbonized rice husks are mainly used as heat preservation agents for ladle irons, but carbonized rice husks produce a large amount of flue gas to pollute the air; carbonized rice husks have a high melting point and are not easy to melt on the surface of molten iron and cannot form a liquid slag layer; poor spreadability , The spreading...

AI Technical Summary

Problems solved by technology

[0002] The molten iron smelted in the blast furnace is transported to the steelmaking plant by ladle. Due to the low temperature of the molten iron, the temperature drops during the transportation by the ladle. The spreadability is not good, and the problem of heat preservation and reduction of secondary oxidation cannot be achieved

At present, carbonized rice husks are mainly used as thermal insulation agents for ladles, but the production process of carbonized rice husks produces a large amount of smoke and pollutes the air; carbonized rice husks have a high melting point, are not easy to melt on the surface of molten iron, and cannot form a liquid slag layer; poor spreadability , the spreading surface only reaches 60% to 70%, and 30% to 40% of the molten iron surface is exposed in the air, and the heat preservation effect is poor; it does not have the metallurgical function of absorbing floating inclusions in the molten iron; when using carbonized rice husk, it is easy to produce flying dust