Brine purification process
AssigneeAllied Chemical Corporation
InventorsAlan B. Gancy, Chester J. Kaminski
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Abstract
In a process for purifying raw brine containing dissolved strontium, calcium and magnesium impurities wherein the raw brine is treated by contacting the brine with sodium carbonate for precipitation of strontium and calcium carbonate, contacting the brine containing the strontium and calcium carbonate solids with sodium hydroxide for precipitation of magnesium hydroxide, and removing strontium carbonate, calcium carbonate and magnesium hydroxide solids from the sodium chloride brine, the improvement which comprises passing at least a portion of said removed solids to the zone wherein the raw brine is contacted with sodium carbonate.
Claims11
In a brine treatment process for removing dissolved strontium, calcium and magnesium impurities from a raw sodium chloride brine containing the same wherein the raw brine is contacted with sodium carbonate for formation of strontium carbonate and calcium carbonate solids, the brine containing the carbonate solids is contacted with sodium hydroxide for formation of magnesium hydroxide solids, and at least a major portion of said strontium carbonate, calcium carbonate and magnesium hydroxide solids is removed from the brine to produce a purified brine, and the brine is thereafter subjected to electrolysis in an electrolytic mercury cell, the improvement which comprises recycling said removed solids, in an amount of from about 25 to 1000% of the solids produced, for admixture with said raw brine and sodium carbonate.
Dependencies are inferred from the claim text.