P350选择萃取草酸钴沉淀母液中的草酸

来源期刊：中南大学学报(自然科学版)2009年第4期

论文作者：田庆华 李治海 郭学益

文章页码：884 - 890

关键词：P350；逆流萃取；草酸；反萃

Key words：P350; counter-current extraction; oxalic acid; stripping

摘    要：针对P350逆流萃取分离草酸钴沉淀母液中草酸和盐酸的可行性，探讨其萃取机理，考察P350浓度、盐酸浓度、草酸浓度对萃取分配比的影响，设计采用多级逆流萃取草酸并用纯水反萃再生萃取剂。在有机相体积V_O与水相体积V_A之比(流比)为2.0，6级逆流萃取条件下，草酸萃取率大于95%，萃余母液中的草酸含量可减至0.004 mol/L；在流比V_O/V_A为1.0，10级逆流反萃取条件下，草酸回收率为95%。

Abstract: The solvent of P350 was applied to extract and separate the oxalic acid from the mother-liquor originated from the precipitation of cobalt by oxalic acid, and its extraction mechanism was deduced. The effects of the concentration of P350, the concentration of hydrochloric acid and the concentration of oxalic acid on extraction distribution coefficient were investigated to determine the best distribution coefficient of the oxalic acid. In the case of phase ratio (V_O/V_A) at 2.0, the extraction of the oxalic acid is more than 95%, and its concentration in the extraction raffinate lower than 0.004 0 mol/L after six-stage counter-current extraction; while the phase ratio (V_O/V_A) of the stripping at 1.0, the recovery of oxalic acid attains more than 95% after ten-stage counter-current stripping.

基金信息：湖南省科技计划项目
长沙市科技计划重点项目