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本文介绍了用离子交换法与液—液萃取法相结合来浓缩和分离铂族金属(PGM)的方法。首先用HCl/Cl溶解PGM金属,然后将溶液通过异硫脲阴离子交换树脂,在树脂上发生了特效的吸附作用。从树脂上淋洗下来的硫脲淋洗液转化成氯络合物。进一步水解(调节)后所产生的溶液送往用阿拉明—336作萃取剂的液—液萃取工序。铂和钯很好地被萃取,而水相中大部分其它PGM不被萃取。如果溶液中贱金属含量不超过PGM离子浓度时,则可直接用液—液萃取。 用硫脲选择性反萃取钯使铂和钯彼此分离,而用硫氰酸盐反萃取铂。本文论述了所有工序的提取化学,也提供了实验中间工厂结果。
This article describes a method for the concentration and separation of PGMs by a combination of ion-exchange and liquid-liquid extraction. First, the PGM metal is dissolved in HCl / Cl, and then the solution is passed through the isothiourea anion exchange resin to effect the specific adsorption on the resin. The thiourea rinse eluted from the resin is converted to a chloro complex. The resulting solution after further hydrolysis (conditioning) is sent to a liquid-liquid extraction process using the Alamin-336 as an extractant. Platinum and palladium are well extracted, while most of the other PGMs in the aqueous phase are not extracted. If the solution base metal content does not exceed PGM ion concentration, you can directly use liquid - liquid extraction. Selective stripping of palladium with thiourea allowed platinum and palladium to be separated from each other, while platinum was back-extracted with thiocyanate. This article discusses the extraction chemistry for all processes and also provides experimental intermediate plant results.