Method for recovering magnesium sulfate products from mixtures of epsomite and halite
US5281242A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1992 |
| Grant date | Jan 25, 1994 |
| Priority date | — |
| Expiry date | Mar 24, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D3/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A simple, efficient and inexpensive method of purifying magnesium sulfate from mixtures of epsomite and halite. The method allows for the preparation of substantially pure magnesium sulfate products. The method generally involves heating a mixture of epsomite and halite to form clusters of lower hydrated magnesium sulfate crystals and subsequently applying slight pressure to the clusters so that they collapse to yield fine, less hydrated magnesium sulfate crystals which can then be easily separated from the comparatively coarse halite crystals. The less hydrated magnesium sulfate crystals can be recrystallized to provide highly purified epsomite which can then be dehydrated to provide kieserite or anhydrous magnesium sulfate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.