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Solvent extraction platinum-group metals, gold

Solvent extraction of platinum-group metals and gold 806... [Pg.779]

The first step in the refining of the platinum group metals (PGMs) is the dissolution of the sulfide matte residue from the base metals refinery. This is done by reaction at high temperature with concentrated HCl and CI2 gas under pressure. Under these conditions the PGMs are oxidized and form stable chloro species. Iridium achieves the oxidation state Ir(IV), while rhodium attains only the 3+ state. The chloro species in solution are thus [AuCy, [PdCy, [PtCy -, [RhCy, and [IrCy -. Gold, palladium, and platinum are easily removed. The separation of rhodium from iridium can be achieved by solvent extraction with tributylphosphate from the acidic HCl... [Pg.389]

See other pages where Solvent extraction platinum-group metals, gold is mentioned: [Pg.379]    [Pg.381]    [Pg.511]    [Pg.379]    [Pg.381]    [Pg.260]    [Pg.132]   
See also in sourсe #XX -- [ Pg.6 , Pg.806 ]



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