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本文为A.B.Bierre等于1989年在Mineral Processing and Extractive Metallurgy(Transactions of the Institution of Mining and Metallurgy Section C)第98卷1—4月号上发表的学术报告。该文研究了用强酸性阳离子交换剂从硫脲浸出液中回收金。金-硫脲络合物Au(SC(NH_3)_2~+易于被阳离子交换剂吸附,问题在于为使该离子交换剂完全再生所进行的金的纯化和洗脱,即得到纯的高浓度含金溶液和使再生后的交换剂能重复用于新的金-硫脲溶液。研究发现,从离子交换剂上解吸金是一配位体-交换过程,而不是普通的离子交换过程。因此,不能把阳离子AuSC(NH_2)(?)充分洗脱下来。金的解吸是由硫脲配位体被硫代硫酸盐置换所造成的,而硫代硫酸盐在置换过程中按下式生成络合阴离子AuS_2O_3~-:
This article is an academic report by A.B.Bierre et al., 1989, Volume 98, January- April, Transactions of the Mining Processing and Metallurgy Section C, Mineral Processing and Extractive Metallurgy. This paper studies the recovery of gold from thiourea leachate using a strongly acidic cation exchanger. The gold-thiourea complex Au (SC (NH 3) 2 ~ + is easily adsorbed by the cation exchanger with the problem of purifying and eluting the gold for complete regeneration of the ion exchanger, ie obtaining a pure, high concentration The gold solution and the regenerated exchanger can be reused for the new gold-thiourea solution. It was found that desorption of gold from the ion exchanger is a ligand-exchange process rather than a common ion exchange process, The cation AuSC (NH2) (?) Can not be fully eluted.The desorption of gold is caused by the replacement of thiourea by thiosulfate, while the thiosulfate is substituted by the following formula Anions AuS_2O_3 ~: