Production of pure magnesium chloride solution from siliceous magnesium minerals
US5091161A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1990 |
| Grant date | Feb 25, 1992 |
| Priority date | — |
| Expiry date | Aug 20, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the production of pure magnesium chloride liquor from siliceous magnesium minerals comprises the steps of continuously leaching the siliceous magnesium mineral with a hydrochloric acid solution at a temperature higher than 50.degree. C. but below the boiling point and in such a manner as to maintain the pH of the slurry below 1.5 to prevent the formation of silica gel, continuously reacting such slurry with a reactive magnesia in order to raise the pH to 4.0-7.0 to precipitate substantially all the impurities from solution while preventing silica gel formation, and performing a solid/liquid separation of the slurry on suitable filtration equipment to obtain pure magnesium chloride liquor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.