本文介绍了异羟肟酸型螯合萃取剂 H106的稳定性及其在金属萃取中的行为,研究了用 H106进行金属萃取的机理和萃合物的稳定常数.实验结果表明,H106的稳定性很高,对金属的萃取性能很好.H106是一种一元弱酸,在试验条件下,它通过氧-氧配位,与金属离子形成内络盐 MeL_n.其对各金属离子的萃取能力强弱与金属络合物积累稳定常数的大小顺序相一致.在一定条件下,在萃取中表现出极佳的选择性.用 H106由湿法炼锌厂置换渣的硫酸浸出液中回收 Ga 和 Ge 已获得十分满意的结果.也可以用于微量钛测定和其他许多方面.
The stability of a new hydroxamic acid type chelating extractant H106 and its extraction chemistry have been investigated.After 50 extraction-stripping cycles its loss is very little,and after long time aeration test in HNO_3 medium its stabil- ity is satisfactory.In H_2SO_4 solution,Ga and Ge may be perfectly separated and recovered by co-extraction and respective stripping.The extraction of group Ⅳ or Ⅴ elements in HCl with H106 was available at their own appropriate acidity. The mechanism of metal extraction by H106 and the stability constants of extracted species have also been studied.H 106 is a weak monobasic acid with superior stability and extractability.It forms internal complexing salts with metal ions under testing conditions through oxygen-oxygen coordination.The order of extractability of metal ions is in agreement with order of cumulative stability constants of metal complexes.It shows excellent selectivity in extraction under certain conditions.H106 gives very satisfactory results in recovery of Ga and Ge from H_2SO_4 leach liquor of residue of hydrometallurgical Zn refinery,and may also be used in the determination of micro-quantities of Ti as well as in many other fields.
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