Recovery of platinum group metals (PGM) from acidic solutions by

Details Recovery of platinum group metals (PGM) from acidic solutions by Recovery of platinum group metals (PGM) from acidic solutions by

1991-01-30

1994-04-19

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 322

Patent

active

053042336

ABSTRACT:
A method is disclosed for the direct recovery of platinum group metals (PGM) from thiourea solutions or highly acidic aqueous solutions in general, such as leach solutions resulting from the acid leaching of precious metal bearing material. The method comprises reduction precipitation of the PGM from solution by alkali metal borohydride (preferably sodium or potassium borohydride) addition thereto at ambient temperature and pressure. The resulting precipitate is readily filtrable to give a product comprising high purity platinum group metal powder. The barren solution can be recycled to the upstream process.

REFERENCES:
patent: 4092154 (1978-05-01), Dietz, Jr. et al.
patent: 4096316 (1978-06-01), Tamai et al.
patent: 4319923 (1982-03-01), Falanga et al.

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