Direct recovery of precious metals by solvent extraction and sel

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

1985-06-05

1987-03-31

Castel, Benoit

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210727, 423 22, 423 24, 75101BE, 75118R, B01D 1104

Patent

active

046541454

ABSTRACT:
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 or is stripped with acid. Platinum (and other precious metals) is stripped into water (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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patent: 4500494 (1985-02-01), Scher
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Demopoulos, George P. et al.; "A Study of the Hydrogenation of Kelex 100 Loaded with Copper"; J. Chem. Tech. Biotechnol., 33A, 249-260 (1983).

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