Method for extracting copper from scrap copper through wet process

Abstract

The invention relates to a method for extracting copper from scrap copper through a wet process. The method comprises the steps of: A) ammonia dissolving leaching: putting scrap copper in a multicomponent solution of ammonia, an ammonia salt, a monovalent chloride, and a divalent copper chloride to form an appropriate electric potential, and reacting the scrap copper with ammonia complex ions so as to be dissolved in the multicomponent solution and generate stable monovalent copper complex ions, filtering out most of metal element impurities Fe, Ni, Al, Sn and Pb from the scrap copper, leaving a small amount of impurities to undergo an oxidation reaction and react with ammonia molecules to generate complex ions of different coordination numbers and exist in the solution; B) extraction for impurity removing: extracting impurities Ag, Fe, Ni, Zn, Bi, Cr, Mn, Sb, Pb, and Sn into an organic phase, and keeping the monovalent copper complex ions in the solution; C) diaphragm electrolytic deposition for preparing high-purity cathode copper: carrying out electrolytic deposition of copper in the cathode chamber of a negative ion membrane electrolyzer, thus obtaining a well crystallized negative copper plate. The method of the invention is characterized by environmental protection and low energy consumption, and can generate high-purity copper directly.

Description

technical field [0001] The invention relates to a casting metallurgical process, in particular to a method for extracting copper from waste miscellaneous copper by a wet method. Background technique [0002] At present, the methods of recycling scrap copper at home and abroad are mainly divided into direct utilization and indirect utilization according to the type and composition of scrap copper. Direct utilization is to directly smelt it into refined copper or copper alloy for users to use, but this method has higher requirements on raw materials. The indirect utilization is mainly to remove the base metal in scrap copper through pyrometallurgy, and cast it into anode plate, and then obtain cathode copper through electrolytic refining for users. [0003] There are currently three different processes for the production of recycled copper by pyromelting, namely one-stage method, two-stage method and three-stage method. The one-stage method is used to treat red miscellaneous...

AI Technical Summary

Problems solved by technology

[0012] Aiming at the disadvantages of the existing scrap copper pyrometallurgy and electrolytic refining to produce cathode copper, which have the disadvantages of high environmental protection pressure, high energy consumption, and difficulty in directly obtaining high-purity copper from cathode copper products, the present invention provides an environmentally friendly, low-energy consumption, capable Method for directly obtaining high-purity copper waste miscellaneous copper wet extraction copper

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