Experimental Study on Preparation of Potassium Metavanadate by Ammonium Polyvanadate

Potassium metavanadate was prepared by ammonium polyvanadate(APV).The effects of crystallization method and vanadium concentration on the compositions of potassium metavanadate were investigated.The results show that the incubation time is 15~20 h,the filtrate residue vanadium than 25 g/L under natural crystallization conditions,and the crystallization time is 5~10 min and the content of residual vanadium in filtrate is less than 2.5 g/L,and the crystallization ratio is more than 97% with crystallization promoter agent.Potassium metavanadate of 1.5 tons,with the compositions of TV ≥ 36%,K ≥ 28%,Na < 0.05% and Fe < 0.02%,were synthesized with crystallization promoter agent by industrial test which achieves the expected goals.