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US 6,267,789 B1Granted
Method for enriching raw salt
AssigneeSolvay (Societe Anonyme)
InventorLéon Ninane
Life of this patent
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Abstract
Process for enriching crude salt, in which the crude salt is ground and then cooled in a saturated aqueous sodium chloride solution, to a temperature below the anhydrous sodium chloride to sodium chloride dihydrate transition temperature, a stock of a powder comprising sodium chloride crystals is collected from the cooling step and the powder is subjected to particle-size fractionation from which a fine particle-size fraction and a coarse particle-size fraction comprising the enriched salt are collected.
Claims9
Process for enriching crude salt, in which
- the crude salt is ground,
- the ground crude salt is cooled in a saturated aqueous sodium chloride solution to a temperature, below the anhydrous sodium chloride to sodium chloride dihydrate transition temperature,
- a stock of a powder comprising sodium chloride crystals is collected from the solution,
- the powder is subjected to particle size fractionation from which a fine particle-size fraction and a coarse particle-size fraction comprising the enriched salt are collected, and
- the sodium chloride crystals in the powder have a higher mean diameter than the mean diameter of the ground crude-salt particles.
2 more elements
Dependencies are inferred from the claim text.