Removal of arsenic from aqueous solutions
AssigneeSherritt Gordon Mines Limited
InventorsDonald R. Weir, Ian M. Masters
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Abstract
A process for removing arsenic from an aqueous solution containing arsenic in the form of a soluble arsenate includes adjusting the pH of the solution if necessary to at least about 10, adding a soluble barium salt to precipitate arsenic as barium arsenate, and removing the precipitated barium arsenate from the solution.
Claims14
A process for removing arsenic from an aqueous solution containing arsenic in the form of a soluble arsenate selected from the group consisting of calcium arsenate and ferric arsenate, comprising ensuring that the pH of the solution is at least about 10, adding a soluble barium salt to precipitate arsenic as barium arsenate, and removing the precipitated barium arsenate from the solution.
A process for removing dissolved arsenic from an acidic aqueous solution comprising raising the pH of the solution to at least about 3 and adding ions selected from the group consisting of calcium ions and ferric ions to precipitate some of the arsenic as at least one of the compounds selected from the group consisting of calcium arsenate and ferric arsenate, separating the precipitate from the remaining solution to provide an aqueous solution containing at least one dissolved arsenate selected from the group consisting of calcium arsenate and ferric arsenate, ensuring that the pH of the solution is at least about 10, adding barium chloride to precipitate arsenic as barium arsenate, and separating the precipitated barium arsenate from the solution.
Dependencies are inferred from the claim text.