Process for removing aluminum species from alkali metal halide brine solutions
US6746592B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1999 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Jul 27, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B15/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for the reduction of soluble aluminum species in an evaporated salt alkali metal halide brine containing up to 500 ppb aluminum species to provide a brine feedstock suitable for use in a chlor-alkali membrane cell process, said method comprising treating said brine with a magnesium salt in an amount to provide a Mg to Al molar ratio selected from 5-20 to 1 at a Mg concentration selected from 0.5-10 ppm, and sufficient alkali metal hydroxide to provide an excess alkalinity concentration of between 0.1-0.5 g/L alkali metal hydroxide to effect precipitation of a magnesium aluminum hydroxide complex; and removing said complex to provide said brine feedstock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.