Polymers containing phosphonic acid groups for the treatment of red mud in the Bayer process
US5534235A · kind A · utility
18Cited by
11References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1995 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Sep 5, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/16
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The invention comprises a process for improved flocculation of Bayer process red mud-containing slurry. The improvement comprises adding to the red mud-containing liquor a phosphonic acid polymer optionally in addition to the conventional flocculant. The polymer is added to the red mud-containing liquor in an amount sufficient to reduce the concentration of suspended solids in the supernatant phase and/or increase the rate of sedimentation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.