Production of alumina from gibbsite-bearing bauxite of low reactive silica content
US4650653A · kind A · utility
5Cited by
2References
8Claims
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Key dates
| Filing date | Apr 30, 1986 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | Apr 30, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/47
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for the low-temperature treatment according to the Bayer cycle of gibbsite-bearing bauxite of low reative silica content, involving desilication of the said bauxite before leaching, by a liquor of low caustic soda concentration and characterized in that this sodium liquor consists of one or more washing waters originating from the Bayer cycle, mixed or otherwise with leaching liquor, wherein the weighted reactive silica content is preferably lower than 5% of the alumina content of the bauxite and the concentration of the sodium liquor used for desilication ranges from 50 to 120 g/liter of Na.sub.2 O caustic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.