Method for the removal of chloride from zinc sulphate solution
AssigneeOutotec Oyj
InventorsMikko Ruonala, Kurt Svens, Antti Arpalahti, Karoliina Lepistö
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Abstract
The invention relates to a method for removing chloride from zinc sulphate solution in conjunction with zinc production. According to the method, the chloride is removed from solution by means of monovalent copper, which is produced in a separate copper(I) oxide formation stage, in which the pH is regulated to the region of 4.5-5.
Claims6
A method for removing chloride from concentrated zinc sulphate solution with copper(I) oxide, whereby a sidestream is taken from the zinc sulphate solution, which is cooled and routed to a chloride removal stage, wherein chloride removal is performed with copper(I) oxide, which is produced in a separate copper(I) oxide formation stage by reducing the copper sulphate contained in the zinc sulphate solution fed into the copper(I) oxide formation stage and the copper sulphate additionally fed into the copper(I) oxide formation stage into copper(I) oxide with zinc powder, said reducing the copper sulphate being conducted at a pH in the range of 4.5-5.
Dependencies are inferred from the claim text.