Recovery of platinum group metals (PGM) from acidic solutions by reduction precipitation with sodium borohydride
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United States of America Patent
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Apr 19, 1994
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N/A
app pub date -
Jan 30, 1991
filing date -
May 10, 1990
priority date (Note) -
Expired
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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.
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