Removal and recovery of magnesium, strontium and barium from brines
US4495160A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1983 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Mar 28, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01F11/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Magnesium is removed from brine by contacting the brine with calcium hydroxide at temperatures above about 80.degree. C. but below the boiling point of the brine. The contacting results in the formation of magnesium hydroxide precipitate which is substantially insoluble in the mother liquor at those temperatures and strontium hydroxide which is dissolved in the mother liquor. When the contacting is carried out at a temperature above about 90.degree. C., magnesium hydroxide precipitate is fast settling and filterable; accordingly, it is removed from the mother liquor by a conventional process, such as filtering. The mother liquor is then cooled to cause the precipitation of at least a substantial part of strontium hydroxide present in the mother liquor. The precipitate of strontium hydroxide is recovered by a conventional process such as filtering. If precipitation upon cooling is insufficient, carbon dioxide gas is introduced into the mother liquor to effect the precipitation of strontium hydroxide. Barium can be removed and recovered in the form of barium sulfate by reacting the remaining mother liquor with sodium sulfate. In order to produce a faster-settling precipitate of magne…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.