Recovery of nickel and cobalt by controlled sulfuric acid leaching
US4541868A · kind A · utility
26Cited by
25References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1983 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Jul 22, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B23/043
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
According to the present invention, improved dissolution of nickel and cobalt and thus improved recovery of those desired metal values is achieved by modifying the ore recovery processes wherein sulfuric acid leaching at elevated temperatures is used to dissolve the nickel and cobalt. In particular, according to the present invention, processes are provided wherein the sulfuric acid and ore are contacted at substantially ambient temperature prior to subsequent heating to attain the elevated temperatures of the sulfuric acid leach. Practice of the present invention has been found to result in improved metal value recovery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.