Research on Preparation of Vanadium Pentoxide for Vanadium-aluminum Alloy

Vanadium-aluminum alloy is primarily used as additive in production of titanium alloy,super-alloy and some special alloys,and vanadium pentoxide is an important raw material for the preparation of vanadium-aluminum alloy.Under laboratory conditions,vanadium pentoxide meeting the requirements for vanadium-aluminum alloy preparation was obtained by re-dissolution for silicon removal and alkaline pre-cipitation of vanadium,with the purity of V₂O₅ reaching 99.5% and the content of Si,Cr and Fe less than 0.05%.After the industrial test,the purity of vanadium pentoxide reached 99.5% and the content of impurities was less than 0.05% with stable process.The optimum parameters are as follows:the molar ra-tio of desilication agent to silicon is 1.05,the pH for desilication is 10.0,the temperature and time for desilication are respectively 70℃ and 60 min;The molar ratio of precipitating agent to vanadium is 3.1,the temperature and time for precipitating reaction are 60℃ and 60 min,respectively.