Recovery of gold in gold plating processes

Details Recovery of gold in gold plating processes Recovery of gold in gold plating processes

Filed on

1982-03-18

Date issued

1983-02-08

Examiner

Andrews, R. L.

Patent Class

Chemistry: electrical and wave energy

SubClass

Processes and products

SubSubClass

Electrostatic field or electrical discharge

Other Related Categories

204109, 210674, 210684, 423 24, 423364, 75107, 75109, 75101BE, C25R 120

Type

Patent

Status

active

Patent number

043728308

Description

ABSTRACT:
A process is described involving gold in which gold cyanide ion (e.g., potassium gold cyanide) is removed from an aqueous solution (typically a water rinse solution) by absorption on an anion-exchange resin and the gold cyanide ion is then removed from the resin using an eluent solution comprising organic solvent, water and thiocyanate ion. This procedure is convenient and leads to virtually complete removal of gold from the resin. Because of the low volume of eluent solution required to remove the gold cyanide ion, the procedure can be used to efficiently produce crystalline potassium gold cyanide from highly dilute aqueous solutions.

REFERENCES:
patent: 2648601 (1953-08-01), Byler et al.
patent: 2753258 (1956-07-01), Burstall et al.
patent: 3582269 (1971-06-01), Keith et al.
patent: 3656893 (1972-04-01), Sloan

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