METHOD FOR ENRICHING RAW SALT

摘要

The invention concerns a method for enriching raw salt, whereby the salt is ground (2), then cooled (7-18) in an aqueous solution saturated with sodium chloride to a temperature lower than the transition temperature of anhydrous sodium chloride and dehydrate sodium chloride; then collecting a powder gruel (9) containing sodium chloride crystals and subjecting the powder to size grading fractionating (10) from which a fine grading fraction (12) and a coarse grading fraction (11) comprising enriched salt are collected.