Slag melting agent and preparation method thereof and semi-steel steelmaking method adopting slag melting agent

Abstract

The invention provides a slag melting agent and a preparation method thereof and a semi-steel steelmaking method adopting the slag melting agent. The slag melting agent mainly contains, by weight, 30%-35% of SiO2, 9%-13% of MnO, 5%-10% of CaO, 6%-8% of Al2O3, 12%-18% of TFe and the balance P2O5, MgO and H2O. The slag melting agent is prepared mainly by manganese ore powder, vanadium tailings, oxide scales, lime powder, bentonite and binding agents. By means of the slag melting agent, semi-steel smelting primary slag formation time can be helped to be kept within 4min; the problems of lance-sticking and difficult dephosphorization caused by difficult slag melting can be solved; content of remaining manganese in semi-steel smelting end-point liquid steel can be increased; content of remaining manganese in converter end-point liquid steel is increased by 0.02%-0.05%; the alloying function is achieved; the application amount of alloyed manganese is reduced.

Description

technical field [0001] The invention belongs to the technical field of converter semi-steel making, and in particular relates to a slagging agent, a preparation method thereof and a semi-steel making method using the same. Background technique [0002] In order to recover the vanadium resources in the vanadium-titanium iron concentrate, the blast furnace is equipped with vanadium-titanium iron concentrate, and the vanadium-titanium molten iron produced is generally firstly extracted from vanadium during the steelmaking process, and then steelmaking. After vanadium extraction, the molten iron (hereinafter referred to as semi-steel) basically contains traces of silicon and manganese, the carbon content is 3.3-3.7wt%, and the temperature is about 1380-1420°C. In the process of smelting semi-steel, due to the single composition of slag elements and insufficient chemical heat, it is difficult to melt the slag during the blowing process of the steelmaking converter, which seriousl...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of slagging agent and its preparation method and semi-steel steelmaking method using it, said slagging agent can promote the formation time of semi-steel smelting primary slag within 4 minutes, and improve the stickiness caused by the difficulty of slagging. Solve the problem of gun and dephosphorization difficulties, and increase the residual manganese content in the molten steel at the end of semi-steel smelting, so that the residual manganese content in the molten steel at the end of the converter is 0.02-0.05%, which plays the role of alloying and reduces the amount of alloyed manganese.

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