Process for removing sulfate from an aqueous salt solution
AssigneeCargill, Incorporated
InventorsRobert Scott Koefod, Richard Hunt Rose, III
Life of this patent
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Abstract
A simple, effective, cost-efficient method of precipitating sulfate in an aqueous salt solution and removing the precipitate from the solution. The steps of the method include diluting the solution and slowly adding a precipitant to the solution. By following this method, a sulfate precipitate settles out of the solution quantitatively and can be easily separated from the sulfate-free supernatant.
Claims31
A method of removing sulfate from an aqueous salt solution, comprising the steps of:
- diluting the solution to a specific gravity of less than about 1.35;
- adding a precipitant to the solution at a rate not to exceed 30 pounds per hour per cubic foot, wherein the precipitant comprises a soluble salt selected from the group consisting of calcium, barium, strontium, and lead;
- and
- separating a sulfate precipitate from a supernatant.
A method of removing sulfate from an aqueous salt solution, comprising the steps of:
- diluting the solution to a specific gravity of less than about 1.35;
- adding a precipitant to the solution at a rate not to exceed 30 pounds per hour per cubic foot, wherein the precipitant comprises a soluble salt selected from the group consisting of calcium, barium, strontium, and lead;
- adding a flocculating agent to the solution;
- allowing the reaction mixture to stand undisturbed for at least about 8 hours;
- and
- separating a sulfate precipitate from a supernatant.
A method of removing sulfate from liquid bittern, comprising the steps of:
- diluting the bittern to a specific gravity of less than about 1.35;
- adding a precipitant to the bittern at a rate not to exceed 30 pounds per hour per cubic foot, wherein the precipitant comprises a soluble salt selected from the group consisting of calcium, barium, strontium, and lead;
- adding a flocculating agent to the bittern;
- allowing the reaction mixture to stand undisturbed for at least about 8 hours;
- and
- separating a sulfate precipitate from a supernatant.
Dependencies are inferred from the claim text.