Process for the production of potassium chloride and magnesium chloride from carnallite
US4140747A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1977 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Oct 20, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/141
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the production of potassium chloride and of magnesium chloride hexahydrate (bischoffite) from carnallite or from carnallite containing sodium chloride. The process comprises heating carnallite at a temperature of between above 70.degree. C. and above 167.5.degree. C. in the presence of added water at the above former temperature or without added water (but preventing evaporation of water) at the above latter temperature. Solid potassium chloride is then separated. In the residual brine, carnallite is precipitated by evaporation or by lowering the temperature, and it is recycled to the starting stage. The residual solution consists essentially of magnesium chloride which is recovered as bischoffite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.