Process and device for recovering electrolytic copper from copper-containing wastewater

Abstract

The invention relates to a process and device for recovering electrolytic copper from copper-containing wastewater. The electrolytic copper is produced by adopting the technological processes of removing suspended matters and part of organic matters through pretreatment, carrying out ultrafiltration treatment, retaining concentrated copper sulfate with a nanofiltration membrane, recovering wastewater and acids with a reverse osmosis membrane and carrying out cyclone electrolysis. The process and the device have the beneficial effects that the recovery rate of the electrolytic copper is 90% and the copper purity is more than 99.95%; meanwhile, the wastewater recovery rate is more than 90%; the recovery rate of free sulfuric acid in the wastewater is more than 90%; the resource recovery rate is high and the economic benefits are good; adopting the technological processes of combined adsorption resin, ultrafiltration membrane, acid stabilizing nanofiltration membrane and high desalting rate reverse osmosis membrane, compared with other membrane recovery systems, the process has the advantage that the properties and service lives of the membranes can be maintained for a long term; the process has the effects of achieving automatic control and ensuring stable operation of a wastewater treatment system and the quality of recovered matters; the process is suitable for recovering copper in the copper-containing wastewater in the electroplating industry, the electronic industry and the metallurgical industry and other copper-containing industrial wastewater and for wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a process and a device for recovering electrolytic copper from copper-containing wastewater. Background technique [0002] At present, the technical methods used to treat nickel plating wastewater at home and abroad mainly include chemical method, membrane method and ion exchange method. According to the requirements of the cleaner production law, electroplating enterprises have strict requirements on metal resource utilization rate and water saving rate. It is the basic requirement of electroplating wastewater treatment to realize the effective recovery of heavy metals and waste water recycling while electroplating wastewater treatment. [0003] (1) Chemical method: At present, some electroplating enterprises still use chemical method to treat copper plating wastewater. The chemical treatment method is to add sodium hydroxide or milk of lime (calcium hyd...

AI Technical Summary

Problems solved by technology

However, it is rare to use membrane technology to recover copper in copper plating wastewater. One of the reasons is that the concentrated solution recovered by membrane method is difficult to remove the impurity components, resulting in the accumulation of harmful impurities in the bath, so it cannot be used directly in the plating tank. Second, for the recovery of acidic copper plating wastewater by membrane method, the obtained concentrated copper sulfate solution is the same as the above-mentioned ion exchange method, and still cannot be directly returned to the copper plating bath for use

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