Production of alumina
US4038039A · kind A · utility
10Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1976 |
| Grant date | Jul 26, 1977 |
| Priority date | — |
| Expiry date | Jul 6, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/473
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In order to control the sodium oxalate level in the liquor employed in the Bayer process for the production of alumina, a part of the spent liquor recovered from alumina trihydrate precipitation stage is concentrated by evaporation to render it supersaturated with respect to sodium oxalate. The thus concentrated liquor is then sprayed onto a packing in an enclosed space under conditions such that the supersaturation of the droplets at impact on the packing exceeds a critical supersaturation. The sprayed liquor deposits sodium oxalate on the packing and is recovered for recirculation to the process circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.