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US 6,645,458 B1Granted
Method for making an aqueous sodium chloride solution
AssigneeSolvay (Societe Anonyme)
InventorCédric Humblot
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Abstract
Process for the manufacture of an aqueous sodium chloride solution, according to which a solid material comprising sodium chloride and heavy metals is dispersed in water, the aqueous medium thus obtained is alkalinized so as to precipitate the heavy metals in the form of metal hydroxides, calcium carbonate is coprecipitated with the metal hydroxides in the aqueous medium and the aqueous medium is then subjected to mechanical clarification.
Claims8
A process for manufacturing an aqueous sodium chloride solution, comprising:
- dispersing a solid material comprising sodium chloride and heavy metals in water to produce an aqueous medium;
- introducing calcium chloride into the aqueous medium;
- alkalizing the aqueous medium to precipitate the heavy metals in the form of metal hydroxides, calcium carbonate being coprecipitated with the metal hydroxides in the aqueous medium by reaction between the calcium chloride and sodium carbonate contained in the solid material;
- and
- subjecting the aqueous medium to mechanical clarification.
2 more elements
Dependencies are inferred from the claim text.