Device and method for recycling heavy metals in electroplating sludge by using bioleaching coupling electrode electrodialysis technology

Abstract

The invention discloses a device and method for recycling heavy metals in electroplating sludge by using a bioleaching coupling electrode electrodialysis technology. The device comprises a cathode chamber and an anode chamber, and further comprises a bioleaching chamber, a first reference electrode, a cathode electrode, a second reference electrode and an anode electrode, wherein the bioleaching chamber is arranged between the cathode chamber and the anode chamber; a stirring paddle and a pH measurement sensing probe are arranged in the bioleaching chamber; the first reference electrode and the cathode electrode are arranged in the cathode chamber; the second reference electrode and the anode electrode are arranged in the anode chamber; the first reference electrode and the second reference electrode are connected with an external power supply through wires; and the cathode electrode and the anode electrode are connected with an electrochemical workstation through wires. According to the device, the heavy metals in the electroplating sludge in the bioleaching chamber can be dissolved out in an ionic state by using bioleaching, separation of anions and cations is realized, and recycling of metals such as Cu, Zn, Cr and Ni in the cathode chamber is realized.

Description

technical field [0001] The invention relates to the technical field of heavy metal recovery, in particular to a device and method for recovering heavy metals in electroplating sludge by using bioleaching coupled electrode electrodialysis technology. Background technique [0002] Bioleaching is a technology that uses microorganisms to produce acid to dissolve metals in solids. This technology was first applied to the treatment of low-grade, dispersed, and refractory ores by using bacteria, which is called bioleaching or biohydrometallurgy. The research on bioleaching mainly focuses on the use of the mixed bacteria of Thiobacillus thiooxidans and Thiobacillus ferrooxidans. Bioleaching has low acid consumption, low operating cost and strong practicability, and is an economical, effective and potential heavy metal removal method. [0003] Electrodialysis (ED), discovered by German scientists Morse and Pierce in 1903, is a kind of membrane separation technology. Under the acti...

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Problems solved by technology

[0006] Bioleaching technology and related electrodialysis technology alone have disadvantages such as low efficiency, high cost, and long running time when they are used alone in the recovery of heavy metals from electroplating sludge. There are few reports abroad, and the optimization of reaction parameters is not in place

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