Feasibility Study on Vanadium Precipitation with(NH₄)₂SO₄-Na₂SO₄ Mixed Salt

In this paper,the feasibility of vanadium precipitation with(NH₄)₂SO₄-Na₂SO₄ mixed salt is studied.The results indicate that vanadium precipitation ratio is at 98.9%~99.3% as the mass ratio of(NH₄)₂SO₄to Na₂SO₄ ≤ 0.3.With TV percentage of 49.85%~50.43%,Na₂O of 0.11%~0.51%,S of 0.100%~0.448%,and K₂O of 0.11%~0.12% after washing of precipitate(APV),it can be found out that Na₂SO₄ content in the mixed salt has little influence on the precipitating process and precipitate compositions.Through precipitate analyzing by SEM and EDS,it can be assumed that Na⁺ and SO₄^2- may exist on the surface of precipitates in a way of surface adsorption,and K+may exist in the precipitate as crystal nucleus or crystal structural ion.The result of the experiment for vanadium precipitation with(NH₄)₂SO₄-Na₂SO₄ mixed salt prepared by concentration of residual liquid of crystallization show that after washing,the precipitate can meet the production requirements.