Method for preparing ferrovanadium alloy based on vanadium slag

Abstract

The invention discloses a method for preparing ferrovanadium alloy based on vanadium slag. The method comprises the following steps: using vanadium slag, including 14-30% of vanadium pentoxide and iron oxide by mass, as a raw material, and adding reducing carbon and a slagging auxiliary material for smelting and reacting to finally obtain ferrovanadium alloy. The slagging auxiliary material comprises any one or a mixture of silicon slag, silica and industrial silicon. According to the method, the silicon slag and the reducing carbon are combined, the qualified ferrovanadium alloy is prepared from the vanadium slag, the silicon simple substance and the semi-coke in the silicon slag are combined, vanadium pentoxide and low-price intermediate oxide of vanadium can be effectively and fully reduced, and it is guaranteed that the vanadium has a high recovery rate; and silicon dioxide hydrate in the silicon slag and silicon dioxide obtained through later decomposition can effectively reduce the basicity of the slag, and ferrovanadium alloy is prepared under the condition of low basicity.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing vanadium-iron alloy based on vanadium slag. Background technique [0002] Ferrovanadium is a kind of iron alloy, which can be obtained by reducing vanadium pentoxide with carbon in an electric furnace, and can also be obtained by reducing vanadium pentoxide by electric furnace silicon thermal method. It is widely used as an element additive for smelting vanadium-containing alloy steel and alloy cast iron, and in recent years, it is also used to manufacture permanent magnets. The ferrovanadium produced in my country has varieties such as V401 and V402, which contain about 40% vanadium. [0003] For the commonly used electric silicothermal method, flake vanadium pentoxide, 75% ferrosilicon and a small amount of aluminum are used as reducing agents, and qualified products are obtained through two stages of reduction and refining in an alkaline electric arc...

AI Technical Summary

Problems solved by technology

This method of operation requires strict control of the slag alkalinity around 1.5 to 3.0. If the alkalinity is too high, vanadium pentoxide is not easily reduced; if the alkalinity is too low, the reduction rate of vanadium pentoxide is low, and the molten iron is relatively thin Big loss

In particular, this method is used to prepare vanadium-iron alloys with vanadium slag as raw material. Since the vanadium pentoxide content in the vanadium slag is about 20%, or even far lower than 20%, the grade is low and cannot be directly used to produce vanadium-iron alloys. It needs to go through a multi-stage process In order to obtain ferro-vanadium alloys that meet the demand