Process for the extraction of precious metals from solutions the

Details Process for the extraction of precious metals from solutions the Process for the extraction of precious metals from solutions the

1981-09-01

1983-06-28

Carter, Herbert T.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75108, 423 22, 423 24, C01G 700, C01G 5500

Patent

active

043903665

ABSTRACT:
A process for sequentially and selectively separating gold and platinum group metals from aqueous solutions containing them is disclosed.
First, ruthenium and osmium are oxidized to their tetroxides and then removed from the solution. Then, gold is removed by solvent extraction preferably with dibutyl carbitol. Next, palladium and platinum are removed by solvent extraction with an alkyl sulphide and tributyl phosphate respectively, care being taken to reduce iridium in solution before platinum extraction to prevent it extracting with the platinum. Then the iridium is reoxidized and removed from solution. Finally, rhodium is removed from the solution.
Using this process gold, platinum and palladium of saleable purity can be extracted directly without the need for further refining steps.

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