Heating slag melting agent for smelting low-silicon liquid iron and preparation method of the heating slag melting agent

Abstract

The invention relates to a heating slag melting agent for smelting low-silicon liquid iron and simultaneously relates to a preparation method of the heating slag melting agent, belonging to the technical field of metallurgy. The heating slag melting agent consists of the chemical ingredients in mass percent as follows: 41-46% of SiC, 5-10% of FeSi, 35-40% of FeO plus Fe2O3, 0-6% of CaO, 0-3% of MgO and 5-10% of CaC2. The preparation method includes the steps of smelting quartz sand and coke into silicon carbide, grinding and mixing materials, and stirring to uniform for formation. In the invention, the characteristic of low melting point of calcium carbide is utilized for assisting silicon carbide and iron silicide in reacting with oxidized iron sheets to emit a large quantity of heat, and simultaneously with good heat conducting property, the silicon carbide rapidly transmit the generated heat during the smelting process, therefore, the slag melting speed is accelerated and the flowability of the liquid iron is improved, and then the smelting yield of steel is enhanced and simultaneously the stable content of silicon in the liquid steel is ensured.

Description

technical field [0001] The invention relates to a heat-generating slag-reducing agent, in particular to a heat-generating slag-reducing agent for smelting low-silicon molten iron, and also relates to a preparation method thereof, belonging to the technical field of metallurgy. Background technique [0002] In the process of steelmaking, it is necessary to remove harmful impurities through slagging. In order to make the impurities continuously react with the slag surface and hope to keep the slag surface in a molten state, it is necessary to take slagging measures. As far as the applicant knows, for a long time, when the silicon content of molten iron in the steelmaking process is low (mass percentage less than 0.1%), if the conventional process of increasing the amount of molten iron and reducing the amount of scrap steel is used, it often results in smelting It's slow and doesn't work well. Because molten iron contains high carbon and silicon content, the silicon content c...

AI Technical Summary

Problems solved by technology

This technical solution has the beneficial effect of reducing the refining cost, but it is difficult to heat the low-silicon hot metal smelting, so it cannot improve the slagging effect of the low-silicon hot metal

In addition, the slagging agent disclosed in the Chinese patent application number 200810110672.2 can achieve the purpose of protecting the furnace lining by adjusting slag, but the test proves that it does not help to speed up the slagging speed of low-silicon molten iron, and cannot improve the melting rate of molten steel

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