Recovering by-products from sea water brines and the like
US4306880A · kind A · utility
Inventor
Key dates
| Filing date | Sep 22, 1978 |
| Grant date | Dec 22, 1981 |
| Priority date | — |
| Expiry date | Sep 22, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D5/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The improved production of sodium sulfate, potassium sulfate and other valuable salts from salt plant bitterns or the like wherein initial reduction in sulfate ion concentration yields salt cake and greatly facilitates the selective recovery of potassium and other valuable by-product salts. The process includes cooling the bitterns while below a certain concentration to produce glauber salt, followed by successive solar evaporation steps to yield harvestable potash salts. The salts are selectively treated and then refined by flotation. The flotation overflow is converted to potassium sulfate product by decomposition and crystallization steps and the underflow provides a recycle salt mixture for converting the glauber salt to salt cake.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.