从氯化浸出液中分离锌与镉的萃取剂选择和评价

Evaluation and Selection of Extractants for Separation of Zinc and Cadmium from Chloride Leaching Liquor

本文选择最有工业应用价值的萃取剂,研究了它们从氧化钠溶液中萃取大量的锌与镉的萃取平衡。结果认为中性络合萃取剂对锌具有选择性;而在锌和铁不存在的条件下,阴离子交换萃取剂可选择性地萃取镉。还讨论了络合物的稳定常数在萃取剂选择与评价中的指导作用。

The distributions of macro quantities of zinc (Ⅱ) and cadmium (Ⅱ) in the aqueous solution of sodium chloride have been measured and the selection of the most important commercial extractants is proposed. It is concluded that the neutral solvating extractants will extract zinc (Ⅱ) selectively. However, cadmium (Ⅱ) , relatively free of iron and zinc, may be extracted selectively by the extractants with liquid anion exchanger. During the evaluation and selection of extractants, the guiding function of the stability constants of the aqueous chloride chlorocomplexes of these two metals have also been discussed.