Method for improving performance of high titanium slag

Abstract

The invention discloses a method for improving the performance of high titanium slag. According to the titanium slag thickening mechanism, the blast furnace air volume and the oxygen content are greatly increased in a targeted mode, the oxygen potential of a blast furnace hearth is increased, and generation of high-melting-point TiC and TiN by reduction is restrained and reduced; on the basis thatMgO and MnO have good fluidity and high oxidability, the content of MgO and MnO in the slag is increased, the content of R2 and R4 in the slag is increased, and the purpose of improving the mobilityand the desulfuration capacity of the slag while promoting the oxidization of the high-melting-point TiC and TiN generated by reduction is achieved; and a narrow smelting temperature interval is controlled, the tapping frequency is increased, slag iron is discharged fully in time, the staying time of the high titanium slag in a furnace is shortened so as to restrain formation of foaming slag, andtherefore the performance of the high titanium slag is successfully improved.

Description

technical field [0001] The invention relates to the technical field of titanium slag control in the smelting process, in particular to a method for improving the performance of high titanium slag. Background technique [0002] Since the fourth quarter of 2018, affected by many unfavorable factors such as the dam failure of Vale in Brazil, the hurricane in Australia, the tense international trade situation, and the increase in production capacity of domestic steel companies, the international iron ore price has risen sharply, and the imported ore 62 general index has increased from 70 US dollars / ton It has risen to US$120 / t and continues to rise, which has caused a great impact on iron and steel enterprises, especially inland iron and steel enterprises. The development and utilization of vanadium-titanium magnetite to replace imported ore has become an effective way for inland steel enterprises to reduce the cost of ore. However, since vanadium-titanium magnetite is a refra...

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Problems solved by technology

[0003] In the prior art, three related patents, "a smelting device for smelting titanium using blast furnace titanium slag", "method for improving metallurgical properties of vanadium-titanium blast furnace slag", and "production method of vanadium slag", all involve titanium slag, " A smelting device that uses blast furnace titanium slag to smelt titanium" uses blast furnace titanium slag as raw material, and uses electric arc furnace to forcibly reduce titanium in the slag to become metal titanium. The focus is on the smelting device, and does not involve blast furnace smelting high-titanium slag and the performance of high-titanium slag Improvement; "method for improving the metallurgical properties of vanadium-titanium blast furnace slag" by adding fluorite to the charge to control the weight percentage of CaF2 in the blast furnace slag at 0.5% to 5% to improve the performance of the slag, and at the same time CaF2 will be used in the blast furnace smelting process Severe corrosion of blast furnace equipment, difficult to apply in the actual production process; the "production method of vanadium slag" is to smelt vanadium slag in a converter, and does not involve the improvement of high-titanium slag smelted by blast furnace and the performance of high-titanium slag

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