摘要:
研究了由多钒酸铵制取偏钒酸钾的工艺技术,考察了结晶方式、钒浓度对偏钒酸钾成分的影响。试验结果表明:自然结晶条件下,结晶孕育时间为15~20 h,滤液中残钒高于25 g/L;加入结晶剂条件下,可以大大缩短偏钒酸钾的结晶时间,结晶时间为5~10 min,滤液中残钒含量低于2.5 g/L,结晶率超过了97%。采用加入结晶剂的方法进行了工业试验,制取了1.5 t偏钒酸钾产品,其成分TV ≥ 36%,K ≥ 28%,Na<0.05%,Fe<0.02%,达到预期目标。
Abstract:
Potassium metavanadate was prepared by ammonium polyvanadate(APV).The effects of crystallization method and vanadium concentration on the compositions of potassium metavanadate were investigated.The results show that the incubation time is 15~20 h,the filtrate residue vanadium than 25 g/L under natural crystallization conditions,and the crystallization time is 5~10 min and the content of residual vanadium in filtrate is less than 2.5 g/L,and the crystallization ratio is more than 97% with crystallization promoter agent.Potassium metavanadate of 1.5 tons,with the compositions of TV ≥ 36%,K ≥ 28%,Na < 0.05% and Fe < 0.02%,were synthesized with crystallization promoter agent by industrial test which achieves the expected goals.
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