Solvent extraction of precious metals with hydroxyquinoline and

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Platinum group metal

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423 24, C01G 5500, C22B 1100, B01D 1100

Patent

active

052846334

ABSTRACT:
The invention relates to the use of a single solvent extraction reagent which greatly simplifies the recovery of platinum, palladium and gold from base metal-containing solutions. The recovery of platinum, palladium and gold from acidic feed solutions which contain chloride ion is accomplished by first using a substituted 8-hydroxyquinoline reagent or a derivative thereof for extraction wherein a chelate is formed between the reagent and the precious metals. The chelated product is sufficiently stable to allow any base metals or complexes thereof to be scrubbed from the organic phase. The precious metal values are then recovered from the reagent by stripping with acidified thiourea solution.

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