Morphology Control for Ammonium Polyvanadate during Vanadium Precipitation Process by Ammonium Salt

Ammonium polyvanadate was prepared via vanadium precipitation under acid condition using ammonium salt,and the effects of pH value,addition amount of ammonium salt,reaction temperature and time for precipitation on the morphology of the obtained ammonium polyvanadate（APV） were investigated.The results show that the spherical APV products with vanadium precipitation rate more than 99% can be obtained by reaction at temperatures above 70 ℃ for 30 min,pH=2.2 and ammonium addition coefficient K=2.3.Stability test results verify the reliability of the vanadium precipitation conditions.By controlling the morphology,high quality of APV products coupled with high vanadium recovery rate can be gained.