Alkali metal gold cyanide method

Details Alkali metal gold cyanide method Alkali metal gold cyanide method

1975-02-18

1976-11-02

Thomas, Earl C.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Carbon containing

204 43G, 204 46G, 423371, C01C 311

Patent

active

039898008

ABSTRACT:
This disclosure relates to a method for preparing alkali metal gold cyanide which has been found to be particularly useful in gold electroplating operations in the semiconductor industry in order to provide electrical contacts to semiconductor devices. In the process, finely divided gold metal particles are reacted with hydrogen peroxide and alkali metal cyanide to produce univalent alkali metal gold cyanide. The alkali metal gold cyanide is then acidified with a mineral acid in order to precipitate out gold cyanide. The gold cyanide is subsequently removed by filtration, washed and redissolved in a solution of alkali metal cyanide thereby yielding the final alkali metal gold cyanide end product in its pure state.

REFERENCES:
patent: 3112174 (1963-11-01), Freedman
Sneed et al., "Comprehensive Inorganic Chemistry", vol. 2, Copper, Silver & Gold, D. Van Nostrand Co., Inc. New York, 1954, pp. 195-197, 230, 232.

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