Use of surfactants in alumina precipitation in the bayer process
US4737352A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1987 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | Apr 9, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/61
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method and composition for producing a more coarse alumina trihydrate crystal in a Bayer process pregnant liquor, involving the addition of approximately 5-400 mg/l of surfactant-oil, the oil dissolving the surfactant which can be selected from a host of surfactants which are stable in (hot) caustic solutions and capable of dispersing hydrophobic liquids in the Bayer liquor. The preferred embodiment involves the use of tall-oil fatty acids; a number of equivalent surfactants are established. The oil or hydrocarbon (hydrophobic) liquid can be selected from paraffinic oils, naphthenic oils, mineral seal oils, fuel oils, and bottoms or residue from a C.sub.10 alcohol distillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.