Background of ferro vanadium technology
Ferrovanadium alloy has a dual strengthening mechanism of fine-grain strengthening and precipitation strengthening, which can reduce the overheating sensitivity of steel, and improve the strength and wear resistance of steel, and is widely used in vanadium-containing microalloy steel, which is mostly used in construction, aerospace, road and bridge industries. At present, the production of vanadium ferroalloy at home and abroad mainly includes thermal reduction methods such as silicon thermal reduction, thermite reduction and carbon thermal reduction. Among them, thermite reduction is the most widely used. The main vanadium-containing raw materials for ferrovanadium smelting are V2O3 and V2O5, and the smelting methods include one-step method, two-step method and multi-stage method.
3. The existing ferrovanadium production method has a long technological flow and low vanadium yield.
uses of ferrovanadium
The purpose of ferrovanadium is to smelt alloy steel. About 90% of the vanadium consumed in the world is used in the steel industry. In ordinary low alloy steel, vanadium mainly refines grains, increases the strength of steel and inhibits its aging effect; Refine grains in alloy structural steel to increase the strength and toughness of steel; In spring steel, it is combined with chromium or manganese. Used together, it can improve the elastic limit of steel and improve the quality of steel; In tool steel, it is mainly to refine the structure and grain of steel, increase the tempering stability of steel, enhance its secondary hardening effect, improve its wear resistance and prolong the service life of tools; Vanadium also plays a beneficial role in heat-resistant steel and hydrogen-resistant steel; Adding vanadium to cast iron promotes the formation of pearlite due to the formation of carbide, which makes cementite stable, and the shape of graphite particles is fine and uniform, which refines the grain of matrix, thus improving the hardness, tensile strength and wear resistance of cast iron.
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