C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/168
C22B 61/00 (2006.01) C01G 55/00 (2006.01) C22B 3/26 (2006.01)
Patent
CA 1164218
ABSTRACT OF THE DISCLOSURE This invention relates to the separation and purification of the platinum group metals; more particularly it relates to the separation of mixtures of Pt and/or Pd from Rh and/or Ru. In more detail, the present invention relates to a process for the separation or purification of platinum group metals in which either platinum, iridium (IV) and/or palladium (II) are present in aqueous solution together with at least one of rhodium and ruthenium and one or more base metals comprising the steps of: (a) contacting the said aqueous solution at a pH of less than 1 with an organic hydrocarbon extraction solvent containing at least one nitrogen containing organic compound selected from the group consisting of primary, secondary and tertiary amines and quarternary ammonium compounds and at least one oxygen containing organic compound selected from the group consisting of alcohols, phenols and carboxylic acids; (b) removing from contact with the said aqueous solution the said organic phase now containing the platinum, iridium (IV) and/or palladium (II) extracted from the aqueous solution together with the nitrogen- and oxygen-containing organic compounds while leaving other platinum group metals and base metals in the aqueous solution; and (c) contacting the organic phase obtained at stage (b) above with an aqueous solution of a strong acid and thus stripping the platinum, iridium and/or palladium from the said organic phase and obtaining an aqueous solution of the said metals.
367011
Matthey Rustenburg Refiners (pty) Ltd.
Ridout & Maybee Llp
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