摘要:
针对酸性铵盐沉钒生产过程,优化了工艺参数和控制手段,为生产高品位的V2O3提供优质的原料。主要讨论了含钒浸出液浓度、铵盐加入量、沉钒温度、反应时间、pH值、搅拌条件及板框压滤过程中洗涤条件等因素对酸性铵盐沉钒法制备的多聚钒酸铵(APV)质量的影响。结果表明:含钒浸出液钒浓度为25~35 g/L,采用两次加酸工艺,沉淀终点温度95℃,沉淀反应时间约35 min,APV滤饼洗涤时间20 min,洗涤水温度在75℃左右,压榨吹风时间80 min,风压≥0.5 MPa,滤饼厚度≤25 mm等工艺条件下,可降低沉淀产物多聚钒酸铵的杂质含量,从而提高产品质量。
Abstract:
The optimization of process parameters and control measures during the process of vanadium precipitation with acidic ammonium is studied to improve the quality of feedstocks for the production of high grade V2O3.Major factors contributing to the quality of APV prepared by vanadium precipitation with acidic ammonium are investigated,such as concentration of vanadate leaching solution,adding amount of ammonium salt,temperature of vanadium precipitation,reaction time,pH value,stirring conditions and washing condition of the plate and frame filter press.The results indicate that impurities in the precipitated APV can be reduced with the concentration of vanadate leaching solution at 25 to 35 g/L,two-step acid adding process,final precipitating temperature of 95 ℃,reaction time of about 35 min,washing time of filter cake for 20 min,temperature of washing water at about 75 ℃,the blowing time during pressing for 80 min,wind pressure of no less than 0.5 MPa,and cake thickness of no more than 25 mm etc.
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