Method for recycling rhenium, arsenic and copper from sulfuric acid wastewater of copper smelting flue gas purification system

Abstract

The invention belongs to the technical field of metal extraction, and particularly relates to a method for recycling rhenium, arsenic and copper from sulfuric acid wastewater of a copper smelting flue gas purification system. The method comprises steps of a. putting highly acid sulfuric acid wastewater generated in flue gas purification into an electrolytic cell, and respectively separating an anode region and a cathode region by a sulfo group anion selective membrane and a polysulfone cation selective membrane; b. preparing peroxymonosulfuric acid in the anode region to be used as a strong oxidant, wherein the concentration of peroxymonosulfuric acid is 30-60g / L, and rhenium and arsenic ions in the highly acid sulfuric acid wastewater are oxidized into high valence rhenium acid radical and arsenic acid radical by peroxymonosulfuric acid; c. enriching and separating arsenic, rhenium and copper under the condition of reaction temperature of 10-40 DEG C, reaction time of 2-5 hours, and conversion between anode and cathode through frequent changeover. The method uses an electroosmosis technology for enriching and separating substances such as arsenic, rhenium and copper in highly acid sulfuric acid wastewater efficiently, and has the characteristics of simple equipment, easy operation, short processes, low energy consumption and comprehensive utilization of all resources.

Description

technical field [0001] The invention belongs to the technical field of metal refining, and in particular relates to a method for recovering rhenium, arsenic and copper from sulfuric acid wastewater in a copper smelting flue gas purification system. Background technique [0002] Copper is a widely used non-ferrous metal; rhenium is a precious rare metal, and there is a trace amount of rhenium in copper sulfide ore. During the high-temperature acid roasting process in copper smelting, a large amount of medium-high concentration SO containing arsenic, rhenium, copper, etc. will be produced. 2 Flue gas, in the existing widely used flue gas acid production process, the flue gas is pre-purified by power wave washing and other methods, resulting in a large amount of highly acidic sulfuric acid wastewater containing heavy metals such as rhenium, arsenic, and copper, which is difficult to effectively treat. [0003] The existing methods for treating high-acid sulfuric acid wastewate...

AI Technical Summary

Problems solved by technology

During the high-temperature acid roasting process in copper smelting, a large amount of medium-to-high concentration SO2 flue gas containing arsenic, rhenium, copper, etc. will be produced. In the existing widely used flue gas acid production process, dynamic wave is often used. Flue gas pre-purification is carried out by means of water washing, resulting in a large amount of highly acidic sulfuric acid wastewater containing heavy metals such as rhenium, arsenic, and copper, which is difficult to effectively treat

[0003] Existing methods for treating highly acidic sulfuric acid wastewater containing rhenium, arsenic, and copper mainly use lime neutralization for treatment. A lot of high value-added metals such as copper and rhenium are wasted; although traditional sulfide precipitation, extraction and separation methods can realize the separation of copper and rhenium, but there are defects such as poor technical and economical efficiency, so most smelters simply treat highly acidic sulfuric acid wastewater Exhaust, both a waste of resources and pollution of the environment

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