Methylated starch compositions and their use as flocculating agents for mineral wastes, such as bauxite residues
US4839060A · kind A · utility
4Cited by
6References
16Claims
0Family size
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Key dates
| Filing date | Oct 21, 1987 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Oct 21, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/54
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Modified starch compositions and their use for flocculating mineral waste residues, particularly the red mud containing alumina liquors from bauxite residues, comprising the addition to an alumina liquor of a flocculating amount of a methylated starch which, optionally, may be hydrolyzed, or a methylated starch which is also sulfonated and, optionally, may be hydrolyzed. Preferably, the methylated starch compositions are potato and dasheen starch derivatives prepared at temperatures of about 50.degree. to about 85.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.