Gold recovery method

Details Gold recovery method Gold recovery method

1982-09-29

1984-01-17

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 83, C22B 1104

Patent

active

044262256

ABSTRACT:
A method is disclosed for recovering visible gold plate from scrap material generated in the production of printed circuit boards and the like without dissolving the gold. The visible gold which is generally adhered to a substrate by a base metal underplating is undermined by etching of the base metal with an aqueous nitric acid etching solution preferably including froth producing compounds. The visible gold plate is recovered as gold flake of substantially the analysis of the gold plate of the scrap.

REFERENCES:
patent: 3052582 (1962-09-01), Snyder
patent: 4261738 (1981-04-01), Valentine

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