A method for removing chloride ions in copper sulfate solution

Abstract

The invention relates to an economic method for removing chloride ions in a copper sulphate solution. The method comprises the following steps: adjusting a pH value and oxido reduction potential and adjusting copper sulphate with sodium carbonate and sodium sulfite to a reaction interval where Na2[CuCl3] can stable exist; carrying out heating, adding elemental copper powder, allowing Na2[CuCl3] in the solution and the elemental copper powder to undergo comproportionation so as to produce a white CuCl cuprous salt precipitate insoluble in water; and carrying out full cooling to separate cuprous salt sediment and the copper sulphate solution so as to obtain a dechlorinated copper sulphate solution. The method utilizes the characteristic that wet cuprous salt sediment is not stable under the condition of a high pH value to convert the wet cuprous salt sediment into dechlorinated copper residues consisting of CuO, CuCO3 and Cu(OH)2 and to return the dechlorinated copper residues into a system for reuse, and a produced sodium chloride solution has high concentration and can be directly used for evaporative preparation of industrial NaCl. The method is widely applicable to removal of chloride ions of various concentrations from high-concentration copper sulphate solutions; reagents added for reaction do not influence quality; except cost for heating, operation cost is negligible; and the method is economic and easily practicable.

Description

technical field

[0001] The invention relates to the field of chemical industry, in particular to a method for removing chloride ions in a copper sulfate solution. Background technique

[0002] The invention belongs to the field of purification of electrowinning circulating liquid for copper-containing waste wet recovery of metal copper, and specifically relates to a method for removing chloride ions from a medium-high concentration copper sulfate solution, which is especially suitable for hydrometallurgical enterprises to process high-chloride ion copper-containing materials When leaching copper-containing minerals with chlorides, the product is a solution purification process for high-purity cathode copper or crystalline copper sulfate products.

[0003] In the wet-process copper regeneration resource industry, the raw materials usually contain a certain concentration of chloride ions. In order to obtain a better product market positioning, cathode copper is usually the bes...

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