Potential-control selective separation method of copper smelting acidic wastewater

Abstract

The invention relates to a potential-control selective separation method of copper smelting acidic wastewater. The method comprises the following steps: adding a potential-control oxidizer into copper smelting acidic wastewater to completely oxidize As (III) into As (V), and adding potential-control sodium sulfide to precipitate copper in the solution in the form of cupric sulfide so as to generate a copper concentrate; adding a potential-control reducer into the decoppered solution to completely reduce the As (V) in the solution into As (III), adding potential-control sodium sulfide to precipitate arsenic in the solution in the form of arsenic sulfide, and neutralizing the dearsenified solution with lime to generate gypsum slag; and sending the neutralization solution to wastewater treatment, and discharging after reaching the standard. The method avoids the idea of traditional neutralizing treatment on copper smelting acidic wastewater by using gypsum, selectively implements fractional precipitation of valuable metals, implements fractional precipitation of copper and arsenic in the acidic wastewater, and has the advantages of favorable copper and arsenic separating effects and low reagent consumption.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of nonferrous metallurgy, in particular to a hydrometallurgical method for separating and recovering valuable metals in copper smelting waste acid by combining potential-controlled oxidation-reduction and potential-controlled sulfidation precipitation. Background technique [0002] Copper is a rose-red heavy non-ferrous metal. Its excellent physical and chemical properties are widely used in various fields such as electrical, national defense, light industry, machinery manufacturing and construction. It is second only to aluminum in the consumption of non-ferrous metal materials in my country. . At present, the general use ratio of copper is as follows: 48-49% in the electrical industry, 19-20% in the communication industry, 14-16% in construction, 7-10% in transportation, and 7-9% in home appliances and others. In 2014, the output of ten non-ferrous metals in my country was 44.17 milli...

AI Technical Summary

Problems solved by technology

There are two common problems in these sewage acid treatment processes: one is that the sewage acid treatment causes a large amount of heavy metals to precipitate into the gypsum slag, which increases the difficulty of waste slag stacking and treatment

The second is to make the valuable metals in the dirty acid enter the waste residue, resulting in a waste of valuable metals, and at the same time, the removal of valuable metals is not complete

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