Morphology Control for Ammonium Polyvanadate during Vanadium Precipitation Process by Ammonium Salt
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摘要: 采用酸性铵盐沉钒工艺沉淀多钒酸铵，研究了钒液浓度、沉淀pH值、铵盐加入量、沉淀时间、沉淀温度对沉淀产物多钒酸铵（APV）形貌的影响。结果表明：在沉钒pH=2.2，加铵系数K=2.3，70℃以上反应30 min即可获得球形的APV产品，且沉钒率>99%。稳定试验结果验证了沉钒条件的可靠性，通过APV产品形貌的控制，可获得高品质APV产品，且保持较高的钒收率。Abstract: 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.
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