METHOD FOR EXTRACTION RECOVERY OF PALLADIUM FROM ACID SOLUTIONS Russian patent published in 2007 - IPC C22B11/00 C22B3/30 

FIELD: hydrometallurgy of non-ferrous and precious metals, in particular, extraction recovery of palladium from acid solutions.

SUBSTANCE: method involves using extractant such as mixture of following components, % by volume: 10-15% of 5-(1,1,3,3-tetramethyl butyl)-2-oxybenzophenonoxime; 4-7% of trialkyl amine (C₇H₁₅-C₉H₁₉)₃N; 8-10% of isooctyl alcohol in organic solvent. Utilization of the given extractant provides for an increase in extraction recovery of palladium from concentrated acid solutions (up to 8 mol/l of HCl and 6 mol/l of NNO₃) of up to 97.0-99.9% and increase in metal capacity of organic phase (up to 10 h/l). Extractant is preferably used for extraction recovery of palladium from solutions having increased acidity and high initial metal content.

EFFECT: increased efficiency in extraction recovery of palladium from acid solutions within wide range of acidity values and increased metal capacity of extractant.

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