Separation of PGM

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Category: Refining and Recovery

Subject: Separation of PGM

Question

What is the best conventional way of separating the PGM in concentrate. The concentrate matrix consists of Cu and Fe and we do expect to have the PGM as high as 20 wt%.

Answer

The methods of treatment depend to a large extent on the economies of scale and the quantities of 'concentrate' envisaged. For larger scale operations, it frequently involves smelting; but for smaller scale quantities, it is not economic to treat these other than by integration into the circuits of existing refineries; such as Johnson Matthey’s in the U.S.A. and Europe.

The platinum group metal separation can then be achieved by a combination of distillation, precipitation and solvent extraction technologies.

For a simplified summary of the refinery options see:

F. L. Bernardis et al., 'A review of separation methods of the platinum-group metals through their chloro-complexes', Reactive & Functional Polymers, 65 (2005) 205-217.

Answer posted 18 December 2006

Submitted by: Mr David Abner

Answered by: David Boyd

Affiliation: Technology Manager, Refining and Analytical Services, Johnson Matthey Technology Centre