Production of useful materials including synthetic nepheline from Bayer red mud
US4810682A · kind A · utility
7Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Jun 10, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D5/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for production of useful materials including a product of similar composition to nepheline involves contacting a slurry of red mud with sulphur dioxide to dissolve components of the red mud that are soluble in sulphurous acid, removing residual undissolved solids by filtration, and recovering a filtrate containing soda, alumina and silica values, removing free water from the filtrate to produce a crystallized residue, and calcining the crystallized residue.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.