Method for recovery of high grade gold alloy from karat gold-clad base metal substrates
US4606797A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1985 |
| Grant date | Aug 19, 1986 |
| Priority date | — |
| Expiry date | Sep 12, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25C5/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.