Recovery of alumina from siliceous minerals
US4158042A · kind A · utility
37Cited by
6References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1978 |
| Grant date | Jun 12, 1979 |
| Priority date | — |
| Expiry date | Sep 27, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/22
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the production of alumina from siliceous minerals containing substantial quantities of combined aluminium and calcium comprises the steps of treating the finely divided mineral with a hot acid liquor containing chloride, fluoride and calcium ions to extract alumina values from the mineral; recovering aluminium chloride from the liquid extract; recycling one fraction of the spent extract to the mineral extraction stage; and treating another fraction of the spent extract to regenerate hydrogen chloride gas for re-use in the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.