Water continuous emulsion polymers for improving scale control in the bayer process
US6086771A · kind A · utility
18Cited by
24References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1998 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Nov 30, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/0653
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is directed to improvements in the Bayer mining process, used for the recovery of alumina from bauxite ore. Water-continuous emulsion polymers are advantageously used to improve the clarification, filtration and scale control of red-mud containing liquors generated during the Bayer process. Preferred polymers are high molecular weight poly(methyl acrylate/acrylic acid), poly(methyl acrylate), poly(vinyl acetate/acrylic acid/methyl acrylate) and a combination of a high molecular weight poly(methyl acrylate/acrylic acid) with a lower molecular weight poly(methyl acrylate/acrylic acid).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.