Method of preparing highly purified kiln dried solar salt
US4488958A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1982 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Dec 20, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB03B9/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Partially purified salt containing less than about 00.4 weight percent insolubles is further purified to reduce the insolubles until the milk pad rating is 3 or better for certain industrial uses and 1 for human consumption. The entry salt is washed in clarified brine to dislodge insoluble impurities adhered to the salt surfaces. The washed salt is then scrubbed with fresh water sprays to displace the wash brine from salt surfaces. The washed salt is drained and then dried in a kiln where flowing air blows away some impurities. The dried salt is passed through a magnetic separator, doubly sifted to remove both large and small impurities, and, where food grade salt is required, passed through a color sorter that removes relatively dark impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.