Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1985-09-12
1986-08-19
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
C25F 500
Patent
active
046067973
ABSTRACT:
A method for recovering high grade gold alloy in an unoxidized condition from karat gold clad to a base metal substrate without significant oxidation of the substrate, wherein the substrate is employed as an anode in an aqueous solution of from about 0.02 to about 2% by weight nitric acid and is subjected to electrolysis at a temperature of from about 48.degree. C. to about 94.degree. C. for sufficient time to delaminate karat gold from the substrate in particulate form and deposit same in the solution, from which the delaminated karat gold may be separated. Also disclosed is an apparatus suitable for carrying out such process, comprising an electrolysis tank wherein the karat gold-clad base metal substrate is mounted in spaced relationship to a cathode, with filtration means disposed in the tank for collection of delaminated karat gold formed during the electrolysis, and means for draining or otherwise withdrawing electrolyte solution from the tank after termination of the electrolysis conditions, whereby the delaminated karat gold may be recovered from the electrolyte solution.
REFERENCES:
patent: 1996985 (1935-04-01), Truthe
patent: 2185858 (1940-01-01), Mason
patent: 2735810 (1956-02-01), Gagliano
patent: 3663388 (1972-05-01), Hedman, Jr.
patent: 4426225 (1984-11-01), Ida
patent: 4462879 (1984-07-01), Castellanos
Ramsey Roger W.
Taylor Arthur D.
Engelhard Corporation
Tufariello T. M.
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