Process for the selective separation of the bound sodium content of red mud
US4133866A · kind A · utility
2Cited by
3References
7Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 28, 1977 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Oct 28, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a novel process for the selective recovery of the sodium content of red mud originating from alumina plants. According to the process of the invention red mud or a slurry thereof is admixed with a ferric sulfate solution, the resulting suspension is stirred intensively for 0.5 to 1 hour at 15 to 85.degree. C, thereafter, if necessary, the pH of the suspension is adjusted to 4.4 to 4.6 and the solid substance is removed from the suspension. Using the process of the invention the sodium oxide content of red mud can be reduced to below 1.5%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.