Metallurgy heat preservation covering agent

Abstract

The invention relates to a metallurgy heat preservation covering agent. The metallurgy heat preservation covering agent is divided into alkaline and acidic types. The alkaline covering liquid comprises the following components of, in percentage by weight, 30%-40% of CaO, 15%-20% of SiO<2>, 10%-20% of Al<2>O<3>, 7%-10% of Na<2>O, 10%-15% of C, 5%-7% of MgO, 0.5%-1% of Fe<2>O<3>, 3%-4% of an expanding agent, 4%-5% of an exothermic agent, and the balance impurities; and the acidic covering agent comprises the following components of, in percentage by weight, 20%-30% of CaO, 30%-50% of Al<2>O<3>,5%-10% of MgO, less than 5% of CaF<2>, 40%-50% of C, 4%-5% of the expanding agent, 2%-4% of exothermic agent and the balance impurities. The metallurgy heat preservation covering agent can prevent secondary oxidation of molten steel, adsorb inclusion floating on the molten steel, does not react with the molten steel, avoid pollution of the molten steel, does not erode the alkaline ladle lining, does not generate slag bonding or form nodules in use, improves the cleanliness of a steel ladle, is favorable for ladle slag turning, simultaneously solves the problems of difficulty in slag turning, is easy to disassembly, reduces labor intensity of workers, and is also favorable for improving ladle life.

Description

technical field [0001] The invention relates to a thermal insulation covering agent, in particular to a metallurgical thermal insulation covering agent, which belongs to the field of steelmaking, ironmaking and casting. Background technique [0002] In steelmaking and casting production, in order to prolong the heat preservation time of molten steel in the ladle and ensure that the molten steel can be successfully cast into qualified steel ingots or billets, the molten steel must have a qualified temperature, because the molten steel in the ladle is directly exposed to the air, which will cause the casting process The temperature of the molten steel in the furnace drops too fast, and the molten steel exposed in the air is easily oxidized again. In order to solve this problem, a certain amount of molten steel covering agent should be added to the surface of the molten steel after the converter is tapped. On the one hand, the molten steel is insulated. , reduce the temperature...

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Problems solved by technology

[0003] At present, carbonized rice husk is mainly used as a covering agent for molten steel. The preparation of carbonized rice husk is simple, but there are some problems as follows: 1. Environmental pollution problems; As a result, the surface of the molten steel is partially exposed in the air, causing rapid heat dissipation of the molten steel; 3. The heat insulation effect is poor, and the heat preservation time is short; 4. The tundish wall is sticky with slag and nodules are serious; bad equipment

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