Recovery of cobalt
US4608235A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1985 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Mar 21, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process is disclosed for recovering cobalt from an alloy containing other metals as chromium, tungsten, etc. The process involves first adding the alloy to fused sodium hydroxide at a temperature of from about 750.degree. C. to about 1000.degree. C. to form a reaction mixture, the amount of sodium hydroxide being sufficient to subsequently form sodium salts which are essentially those of chromium and tungsten and hydroxides which are essentially those of cobalt and nickel. The reaction mixture is then heated at a sufficient temperature for a sufficient time while introducing an oxidizing gas into the reaction mixture to form a melt which consists essentially of the sodium salts and the hydroxides, followed by cooling the melt. The cooled melt is then contacted with sufficient water to form a solution containing the major portion of the sodium salts and a solid containing the major portion of the hydroxides, followed by separating the solid from the solution. The solid is then washed with sufficient water to remove the remaining portion of the sodium salts and other water soluble impurities and then separated from the resulting wash water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.