Method of decreasing the organic substance content of alum earth production cycle performed according to the Bayer technology
US4335082A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1980 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Oct 29, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F7/473
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a new method of reducing the organic substance content of alum earth production cycle performed according to the Bayer technology. By the method of the invention the majority of the organic substances present in the circulating lye can be removed easily and with only slight losses in sodium content. According to the invention one proceeds so that soda present in the hydrate wash and/or in the soda salt solution is caustified with lime, the solution is evaporated to reach a total sodium oxide concentration of 200 to 400 g/l, the precipitated solid is separated and removed from the system, and the liquid is recycled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.