Separation of metals
US4002469A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1975 |
| Grant date | Jan 11, 1977 |
| Priority date | — |
| Expiry date | Mar 18, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention relates to refining platinum group metal concentrate and the separation therefrom of silver and the majority of base metals which are present in them. In more detail, the process comprises the steps of: PA1 A. contacting a solid particulate mixture of base, silver and precious metal components, any of which may be in metallic or in chemically combined form, with substantially anhydrous sulphuric acid at a temperature which is sufficiently high for most of the base metal and silver components to form water soluble sulphates and PA1 B. separating the said water soluble sulphates from the solid precious metal-containing components by contacting the product from step (a) with a dilute aqueous solution or water and dissolving therein the said water soluble sulphates formed in step (a).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.