Production process for smelting vanadium ferro-alloy by electro-aluminothermic process

Abstract

The invention belongs to the technical field of iron alloy smelting, and in particular relates to a production process for smelting vanadium ferro-alloy by an electro-aluminothermic process. The important improvement is to provide a low-cost and easily controlled slag modification step in which a furnace liner is not corroded. The production process comprises the following steps of: A, mixing materials; B, performing reductive smelting; C, modifying slag; and D, casting and crushing for forming according to a conventional method. The improvement is that: iron oxide is added into the step C for modifying the slag, and the adding amount of the iron oxide is 15 to 20 percent of the weight of aluminum; and after the iron oxide is smelted, when the vanadium ferro-alloy is smelted to the furnace temperature of between 1,600 and 1,900DEG C and the aluminum in the vanadium ferro-alloy melt is less than 0.5 percent, the vanadium ferro-alloy melt and the slag are discharged together from the furnace. The added iron oxide facilitates removal of residual aluminum, and the aluminum in the alloy is reduced to be 0.2-0.5 percent; meanwhile, the slag property can be adjusted, the smelting point of the furnace slag is reduced, the smelting is smoothly performed and the metals in the slag are settled to the alloy melt; moreover, the yield of vanadium is 97 to 99 percent, so that the vanadium ferro-alloy smelting cost is reduced, the product quality is improved, and the enterprise benefit and resource utilization rate are improved.

Description

A production process for smelting vanadium-iron alloy by electric thermite method technical field The invention belongs to the technical field of ferroalloy smelting, and in particular relates to a production process for smelting vanadium-ferroalloy by electric thermite method, and the key improvement is in the slag adjusting step. Background technique Ferro-vanadium alloy (hereinafter referred to as ferro-vanadium) is an important alloy additive for steelmaking, and the common methods are electrosilicothermic method and electroluminothermic method. It adopts V2O5 electrosilicon thermal smelting process, which has mature production technology, advanced equipment level and stable product quality. The recovery rate of vanadium by electrosilicothermal method abroad is more than 95%, but the quality and vanadium recovery rate of ferrovanadium produced by V2O5 electrosilicothermal process in China still have a certain gap with the advanced level abroad. Domestic companies usu...

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Problems solved by technology

In actual production, in order to fully reduce vanadium oxides, excessive aluminum powder is generally added, which will result in high aluminum content in the alloy, high melting point of slag, high smelting temperature, which is not conducive to smooth smelting, and iron inclusion in slag And other issues

Usually, in order to remove the aluminum in the vanadium-iron alloy liquid, V2O5 is generally used as the oxidant to oxidize the aluminum; at the same time, in order to reduce the melting point and fluidity of the slag, CaF2 is often used as the slag adjusting agent; this method not only increases the cost, but also causes slag The content of vanadium in the medium is high, and the vanadium-rich slag needs to be returned to the furnace for use, which increases the difficulty of smelting operations, and the slag will corrode the furnace lining after adding CaF2

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