Gold recovery method
US4426225A · kind A · utility
16Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1982 |
| Grant date | Jan 17, 1984 |
| Priority date | — |
| Expiry date | Sep 29, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S75/954
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.