Method for recovering copper in high chlorine copper smoke by wet method

Abstract

The invention relates to a method for recovering copper in high chlorine copper smoke by a wet method; and the method comprises the following steps of: (1) carrying out water leaching and chlorine eliminating to chlorine-containing copper oxide smoke; (2) extracting copper ions in a water leaching solution by N902 solvent - reverse extraction electro-deposit copper; (3) acid leaching of water leaching slag; (4) eliminating chlorine of copper powder in an acid leaching solution; The dechlorination slag obtained by the method treating the high chlorine copper smoke can be used as a raw materialfor pyrometallurgical copper; the harm of chlorine to electrolytic copper is eliminated; and the use value is improved; The process has short flow and strong operability. The neutralized liquid can return to a washing process to wash chlorine; after chlorine ions are concentrated to a higher concentration, a multi-effect evaporator can be adopted; and the chloride can be recovered by concentrationand crystallization, so that the non-industrial waste water discharge and the non-hazardous waste slag production can be realized; and the method is a green and environment-friendly process technology.

Description

Technical field [0001] The invention relates to the field of non-ferrous metal metallurgy, in particular to a method for wet recovery of copper in high-chlorine copper dust. Background technique [0002] Industrial copper dust is a kind of dust containing valuable metals such as copper, zinc, nickel, lead, tin, etc. produced by the process of pyrometallurgical copper smelting. It is a secondary renewable resource of multiple valuable metals. At present, chlorine-rich copper fume occupies an important position in the secondary resource recovery of copper. [0003] The treatment process of copper fume varies according to whether it contains chlorine. Copper fume with low or no chlorine content can be directly leached with sulfuric acid, and the leaching solution can be directly electroplated with copper. Liu Zhiming·Analysis and Suggestions on Comprehensive Recovery Process of Copper Smelting Fume·(China Nonferrous Metallurgy, October 5, 2015, 44-48), elaborated on sulfuric acid lea...

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Problems solved by technology

There are already some domestic invention patents for the treatment of copper fumes with high fluorine and chlorine content. The invention patent of Chenzhou Fengyue Environmental Protection Technology Co., Ltd. "A Method for Wet Treatment of High Fluorine and Chlorine-Containing Zinc-Containing Copper Dust" CN201710854634.7 uses secondary Alkali washing of high fluorine and chlorine-containing zinc-copper fume, alkali washing slag undergoes neutralization process, leaching zinc and copper and other valuable metals in copper fume, after neutralization, the liquid is subjected to copper precipitation to remove chlorine, and after chlorine removal, the liquid is subjected to two goethite The alum sinking method removes impurity ions such as iron, arsenic, antimony, fluorine and chlorine in the solution and reduces the COD of the solution. After sinking the alum, the liquid enters the dense tank for subsequent purification treatment, and finally enters the zinc electrodeposition system, and the neutralization slag passes through once The acid leaching slag enters the pyrometallurgy lead smelting system after medium acid and high acid leaching, and the valuable metals such as zinc and copper are effectively recovered in the whole process. to green

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