研究β-二酮(HA)与CYANEX923或LIX84I的混合萃取剂在氨性溶液中的萃锌行为;系统讨论有机相萃取剂浓度、水相pH、总氨浓度、温度和阴离子等对萃取性能的影响,从锌萃合物及β-二酮萃取剂结构方面讨论2个混合萃取体系的协同萃取机理.结果表明,HA与CYANEX923混合比与LIX84I混合具有更加明显的协同效应；水相pH和总氨浓度的升高均使萃取性能降低,因为升高pH或氨浓度会促使锌氨配合物的生成,降低水相自由锌离子的浓度,但HA与CYANEX923混合体系在较高pH或总氨浓度下仍具有明显的萃取性能；不同阴离子对HA与CYANEX923混合萃取体系的性能没有明显影响,但在HA与LIX84I混合萃取体系和单独使用HA萃取过程中以(NH-4)2 SO4＞NH4NO3＞NH4Cl顺序降低.
Abstracts:The extraction behaviors of zinc from ammoniacal solutions were investigated usingβ-diketone (HA) and their mixtures with CYANEX923 or LIX84I.The effects of pH,total ammonia concentration,extractant concentration,anion species and temperature on zinc extraction were examined.The synergistic mechanism was discussed with regard to the structure of extractant and the extracted zinc complexes.It is found that the increase of total ammonia concentration and pH inhibits zinc extraction for all extraction systems due to the formation of zinc ammine complexes in aqueous phase.This effect of HA with CYANEX923 is evidently smaller than that of HA with LIX84I or HA alone system.Effect of anion species on the zinc extraction by HA with CYANEX923 can be neglected,but this effect of HA alone and the mixture of HA with LIX84I decreases in the order of (NH4)2SO4＞ NH4NO3 ＞ NH4Cl.
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