Clarification of bayer process liquors
US4789485A · kind A · utility
12Cited by
8References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1987 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Mar 25, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/47
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The clarification of a sodium aluminate liquor in the Bayer Process, especially the liquor obtained by Kelly filter filtration of the supernatant from the primary settling stage, is improved by flocculation with a polymer of the formula CH.sub.2 .dbd.C(R.sup.1)CONHR.sup.2 NR.sup.3 R.sup.4 wherein R.sup.1 is hydrogen or methyl, R.sup.2 is straight or branched chain C.sub.2-8 alkylene having at least 2 carbon atoms in the backbone and R.sup.3 and R.sup.4 are independently selected from C.sub.1-4 alkyl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.