Preparation of NH4VO3 by Carbonation Leaching of Calcium Vanadate
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摘要: 针对钒酸钙碳酸化浸出液Na/V高、钒浓度低等问题,提出碳酸氢钠、碳酸氢铵混合浸出制备偏钒酸铵的新方法,主要研究了浸出剂组成、浸出CO32-/Ca2+、浸出温度、液固比等因素对浸出效果的影响规律。结果表明,钒酸钙在浸出剂组成Na HCO3∶NH4HCO3=1∶1、浸出CO32-/Ca2+=1.1、浸出温度90℃、液固比(4~5)∶1等条件下浸出,得到的浸出液钒浓度为43.87~54.57 g/L,钒浸出率为97.80%~98.01%。浸出液利用碳酸氢铵沉淀偏钒酸铵,钒沉淀率为91.31%,钒产品满足质量指标控制要求。Abstract: In view of the problems of high Na/V ratio and low vanadium concentration of carbonation leaching solution of calcium vanadate,a new method of preparing ammonium metavanadate by mixed leaching of sodium bicarbonate and ammonium bicarbonate was proposed.The effects of the leaching agent compositions,CO32-/Ca2+,leaching temperature and liquid-solid ratio on the leaching effect were studied.The results show that under the conditions of Na HCO3∶NH4HCO3=1∶1,CO32-/Ca2+=1.1,leaching temperature of 90℃and liquid-solid ratio of (4~5):1,the leaching solution with 43.87~54.57 g/L of vanadium concentration and the vanadium leaching rate of 97.80%~98.01% can be obtained.Ammonium metavanadate is precipitated by ammonium bicarbonate in the leaching solution,and the vanadium precipitation rate is 91.31%.The vanadium product meets the quality control index requirements.
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Key words:
- NH4VO3 /
- calcium vanadate /
- carbonation leaching /
- vanadium leaching rate
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