Method for reclaiming gold

Details Method for reclaiming gold Method for reclaiming gold

1985-11-22

1987-05-26

Doll, John

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75101R, 75111, 423 27, 423 34, 423 38, 423 42, 423 46, 204109, C22B 1104

Patent

active

046682899

ABSTRACT:
A method for reclaiming gold in metallic form from gold-containing scrap, including gold-containing base metal alloys and articles in which base metals are at least partially covered with a layer of gold. The method includes the steps of exposing the gold-containing scrap under an inert atmosphere to a leaching solution. The leaching solution has dissolved therein an oxidizing agent including metal ions capable of assuming at least two oxidation states, a portion of the metal ions being in the higher of the two oxidation states. The leaching solution also contains a complexing agent including halide ions in aqueous solution. By so exposing the gold-containing scrap to the leaching solution, base metal contained therein is dissolved to leave a solid metallic residue enriched in gold. The solid metallic residue then is collected mechanically.

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patent: 3880653 (1975-04-01), Hougen
patent: 4244735 (1981-01-01), Reynolds et al.
patent: 4261738 (1981-04-01), Valentine et al.
patent: 4266972 (1981-05-01), Redond-Abad et al.
patent: 4423011 (1983-12-01), Baglin et al.
patent: 4426225 (1984-01-01), Ida et al.

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