Method for extracting vanadium from vanadium slag through sodium salt roasting

Abstract

The invention discloses a method for extracting vanadium from vanadium slag through sodium salt roasting, and belongs to the technical field of non-ferrous metal metallurgy. The method comprises the following steps of: finely grinding the vanadium slag in a multi-stage vertical fine grinding machine; feeding the vanadium slag meeting the granularity requirement into a multi-stage magnetic separation system to separate metallic iron in the vanadium slag; mixing the vanadium slag from which the metallic iron is separated with sodium carbonate, roasting a mixture in a rotary kiln; mixing roasted clinker with water, and performing slurrying; performing leaching in high-efficiency self-suction stirring equipment; and after the leaching reaction, performing liquid-solid separation to obtain a sodium vanadate leaching solution and vanadium extraction tailings. According to the method, material returning is not needed, only one-time roasting is needed, the single-time treatment amount is increased by 80% or above, energy consumption is low, the process is simple, the vanadium leaching rate reaches 95% or above, and the vanadium yield is high.

Description

technical field [0001] The invention relates to the technical field of vanadium extraction by sodium roasting of vanadium slag, in particular to a method for extracting vanadium by sodium roasting of vanadium slag. Background technique [0002] Vanadium slag is obtained by oxidative blowing of vanadium-containing pig iron. It is the main raw material for vanadium extraction at home and abroad, accounting for about 90% of the total amount of vanadium extraction raw materials. The sodium roasting vanadium extraction process is widely used in vanadium slag extraction due to its mature technology, accounting for about 80% of the current vanadium slag extraction industry, so sodium roasting vanadium extraction is the mainstream vanadium extraction technology in the current vanadium industry. [0003] Sodium roasting of vanadium slag is to mix vanadium slag and sodium carbonate, and oxidize and roast at about 800°C. A variety of reactions occur during the oxidation roasting proce...

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Problems solved by technology

[0004] Patent CN102477491A discloses a method for sodium roasting of vanadium slag. This method is to pre-react vanadium slag with an oxidant to oxidize low-valent vanadium in vanadium slag to pentavalent vanadium, and then cool down the oxidized vanadium slag and mix it with Sodium carbonate is mixed and roasted at elevated temperature. This method effectively solves the problem of sintering during the roasting process of vanadium slag. However, since two roastings are required, and after the first roasting, it is necessary to lower the temperature and then heat up the mixture for the second roasting, and the heat energy is ineffectively consumed. , high energy consumption

[0005] Patent CN102851507B discloses a method to solve the problem of vanadium slag roasting and sintering. This method is first to roast the mixed material of vanadium slag and soda ash in a weak oxidizing atmosphere, and then roast the roasted clinker in a strong oxidizing atmosphere for a second time. Roasting, this method can effectively control the liquid phase content in the material, thereby avoiding the phenomenon of vanadium slag sintering, but this method still adopts the method of two-stage roasting, the process is long and the energy consumption is high

[0006] To sum up, the current vanadium extraction technology of vanadium slag sodium roasting solves the problem of material sintering in the process of vanadium slag sodium roasting by returning tailings or multi-stage roasting, which generally has long process, high energy consumption and low vanadium yield. Therefore, it is urgent to develop a new vanadium slag sodium roasting method to solve the problems existing in the current vanadium slag sodium roasting process

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