Process for the decomposition of sodium aluminate liquor for the production of alumina
US4865825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1987 |
| Grant date | Sep 12, 1989 |
| Priority date | — |
| Expiry date | Aug 28, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/662
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A process and an apparatus for the continuous decoposition of a supersaturated sodium aluminate liquor forming a suspension in the presence of aluminium trihydroxide seed characterised by: PA0 (a) bringing into contact in a non-agitated grading decomposer a feed flow formed by the suspension and a recycling flow which is taken off in the underflow zone of the decomposer, PA0 (b) simultaneously drawing off a production flow in the same underflow zone, PA0 (c) extraction of an overflow flow at the overflow of the grading decomposer, and PA0 (d) suitable regulation in dependence on the flow rate of the feed flow, the flow rate of the recycling flow, the speed of discharge flow of the suspension in the underflow zone and the speed of rise of the suspension in the overflow zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.