Process for the separation of arsenic acid from a sulfuric acid-containing solution

Abstract From the Canadian patent

The present invention provides a process for the separation of arsenic acid from a solution which comprises sulfuric acid, water, and arsenic acid. In step (a), the solution is reacted with copper or a copper-containing compound in an amount sufficient and at a temperature sufficient to produce copper arsenate. In step (b), an alkali solution is added to the solution resulting from step (a) in an amount sufficient to precipitate the produced copper arsenate and solubilize the sulfate salt of the alkali. In step (c), the precipitated copper arsenate is separated from the solution resulting from step (b). The separated copper arsenate can then be used in the preparation of intermediates which …