Vanadium extraction method of ultralow-silicon vanadium-titanium molten iron converter

Abstract

The invention relates to a vanadium extraction method of an ultralow-silicon vanadium-titanium molten iron converter and belongs to the technical field of vanadium-titanium ore smelting. According tothe crystallization characteristic and principle of vanadium slag, a silicon-containing slag adjusting material potassium feldspar is used for carrying out slag adjusting on ultralow-silicon molten iron, the vanadium extraction cold material type of the converter is adjusted, the bottom blowing gas supply strength is adjusted, the vanadium slag discharging manner is perfected, vanadium extractionfinal point control is adjusted, and the effects of improving the vanadium slag grade obtained after vanadium in the ultralow-silicon molten iron is extracted, reducing the iron taking amount of the vanadium slag and improving the quality of the vanadium slag are achieved. The method is simple and reliable, the problems that the vanadium slag grade is low, crystallization is difficult, and iron taking is severe are solved, existing equipment does not need to be modified, when the molten iron V is larger than or equal to 0.200%, after the vanadium is extracted from the ultralow-silicon molten iron, the vanadium slag grade rises up to 12.03% from 8.57%, the iron taking amount in the slag is reduced to 19% from 25%, and the method is easy to apply and popularize.

Description

technical field [0001] The invention belongs to the technical field of vanadium-titanium ore smelting, and in particular relates to a method for extracting vanadium in an ultra-low silicon vanadium-titanium molten iron converter. Background technique [0002] When the blast furnace smelts vanadium-titanium ore, low-Si operation is usually adopted in order to suppress the reduction of Ti, ensure the smooth operation of the blast furnace, reduce the fuel ratio, and increase the output. In vanadium-titanium ore vanadium extraction and steelmaking enterprises, most of them control the Si content of vanadium-titanium hot metal in the range of 0.1%-0.3%, and the proportion of Si content <0.10% is basically zero. During the smelting process of vanadium-titanium ore in Yugang, due to the large fluctuation of ore and fuel, the proportion of molten iron Si<0.10% increased to 30%. When the converter organizes molten iron with Si<0.10% to extract vanadium, problems such as low...

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Problems solved by technology

When the converter organizes the molten iron with Si<0.10% to extract vanadium, the problems of low vanadium slag grade, difficult crystallization and serious strip iron frequently occur, which have a great impact on the vanadium extraction and steelmaking operation of the converter

[0003] When vanadium is extracted by converter, the influence of Si content in molten iron on the quality of vanadium slag has been studied to some extent. However, due to the large-scale blast furnace and better stability of raw materials and fuels in most enterprises, the proportion of ultra-low silicon (Si<0.10%) molten iron is small. not studied in depth

The ultra-low silicon molten iron converter vanadium extraction has not yet formed a mature and stable technical solution, which has been used in the production process of converter vanadium extraction for a long time. The ultra-low silicon molten iron converter vanadium extraction needs further research on the converter vanadium extraction process

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