Effects of Impurities on Ammonium Polyvanadate Precipitating

Effects of impurities such as Cr,P,Si,Cl^-and SO₄^2-on ammonium polyvanadate are investigated as ammonium polyvanadate is precipitated with acidic ammonium salt.The results show that the increase of Cr concentration significantly reduces the vanadium precipitation rate,especially for the vanadium liquid with low concentration;Si and SO₄^2-exert little influence on the precipitation,while P has a noticeable effect as its concentration is above 0.1g/L,the precipitation rate of vanadium is below 75%;the effect of low-concentration Cl^-is not notable,however,when the concentration of NaCl is above 100 g/L,the precipitation rate of vanadium is below 20%.