Method and a system for gold extraction with halogens
US9051626B2 · kind B2 · utility
4Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2012 |
| Grant date | Jun 9, 2015 |
| Priority date | — |
| Expiry date | Oct 12, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B11/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a method for the extraction of precious metals, using halogens. It has been found that introducing halogens in the reactor in the form of hypohalites rather than free halogens simplified greatly the recycling of halogens by electrolysis. It increases the rate of addition of the halogens and significantly reduces secondary reactions with base metals such as iron. Operating under acidic conditions, the gold recovery has been found as high with hypochlorite as with elemental chlorine, with an active chlorine to ore ratio reduced by a factor of two to five.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.