Alumina recovery using aluminum containing layered double hydroxide
US7666373B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 2007 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Aug 8, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2002/22
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for recovering alumina values from a first liquor having an initial concentration of aluminate ions and hydroxyl ions in solution is described. The first liquor is treated with a hydroxide of a metal other than aluminium to form an aluminium-bearing layered double hydroxide and produce a treated stream of first liquor, the treated stream of first liquor having a final concentration of aluminate ions less than the initial concentration of aluminate ions. The aluminium-bearing layered double hydroxide is separated from the treated stream of first liquor. Thereafter the clarified treated stream of first liquor is returned to a first location within an alumina refinery. The separated aluminium-bearing layered double hydroxide is contacted with a solution containing carbonate ions to form a slurry comprising an insoluble salt of the metal other than aluminium and a second liquor comprising aluminate ions released from the aluminium-bearing layered double hydroxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.