Direct recovery of precious metals by solvent extraction and...

Details Direct recovery of precious metals by solvent extraction and... Direct recovery of precious metals by solvent extraction and...

C - Chemistry, Metallurgy

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B

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C22B 11/06 (2006.01) C01G 55/00 (2006.01) C22B 3/34 (2006.01) C22B 3/36 (2006.01)

Patent

CA 1223125

T I T L E DIRECT RECOVERY OF PRECIOUS METALS BY SOLVENT EXTRACTION AND SELECTIVE REMOVAL I N V E N T O R S George P. Demopoulos George Pouskouleli Pierre J.A. Prud'homme ABSTRACT OF DISCLOSURE The direct recovery of precious metals, particularly gold and the platinum group metals, from chloride solutions, is achieved by solvent extraction and selective stripping/precipitation. Substituted quinolines are used as active extractant, in particular alkyl substituted 8-hydroxyquinoline. Gold is precipitated either by hot water,or by hydrogen after a cold water wash. Palladium remains in the organic phase and is precipitated by more severe hydrogen reduction. Platinum (and other precious metals) is stripped into the aqueous precipitant or wash, and can be recovered by hydrogen reduction (in stages). The organic phase is not degraded providing acid is washed out before any hydrogen reduction, and can be recycled.

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