Treatment and disposal of red mud generated in the Bayer Process
US5607598A · kind A · utility
7Cited by
12References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1995 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Jul 14, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/066
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Red mud bauxite residue produced in the Bayer Process is treated in a plurality of centrifuges and repulp tanks to successively wash and dewater the red mud. A final centrate liquor is obtained in a first upstream centrifuge stage which is rich in alumina and caustic values for respective recovery and reuse. The concentrated red mud cake produced in the final downstream washing/centrifuge step is low in caustic and alumina concentration permitting environmentally friendly disposal. The concentrated red mud cake is reslurried and mixed with bauxite sand for disposal in a dry stacking impoundment area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.