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Method for treating zinc-containing electroplating wastewater and recovering zinc by electrolysis

A technology for electrolytic treatment and electroplating wastewater, applied in metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of low removal rate, secondary pollution, complex process, etc., and reduce the side reaction of electrolysis hydrogen Effect

Inactive Publication Date: 2010-06-02
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a simple, easy-to-control, non-secondary process for the shortcomings of the existing technology for treating zinc-containing ion electroplating wastewater, which are complex in process, difficult to control, secondary pollution, and low in removal rate. Method for electrolytically treating zinc-containing electroplating wastewater and recovering zinc with pollution, high removal rate, and recyclable metal zinc deposited

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  • Method for treating zinc-containing electroplating wastewater and recovering zinc by electrolysis

Examples

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Embodiment 1

[0028] Refer to attached figure 1 , a method for electrolytically treating zinc-containing electroplating wastewater and recovering zinc. The electrolytic treatment of zinc-containing electroplating wastewater is carried out through an electrolytic treatment of zinc-containing electroplating wastewater. The electrolytic treatment of zinc-containing electroplating wastewater includes an electrolytic cell 1 and an electrolyte stirring device. The electrolytic cell 1 adopts a glass electrolytic cell, the anode 3 adopts a titanium-based platinum electrode, and the cathode 4 adopts a zinc electrode. The anode 3 and the cathode 4 are arranged alternately in a unipolar parallel manner, and the top of the electrolytic cell 1 is provided with an exhaust port 5 and a feed port 7. A valve is provided on the feed port 7, a pH meter 6 is provided in the electrolytic cell 1, a discharge port 8 is provided at the bottom of the electrolytic cell 1, and a valve is provided on the discharge port...

Embodiment 2

[0031] Refer to attached figure 1 , The electrolytic treatment of zinc-containing electroplating wastewater device for electrolytic purification of zinc-containing ion electroplating wastewater is the same as in Example 1. The method for electrolytic treatment of zinc-containing electroplating wastewater is: the electroplating wastewater with a zinc concentration of 150.0 mg / L enters the electrolytic cell 1 through the feed port 7 as the electrolyte 2, and an appropriate amount of Na is added to the electrolyte 2 2 C O 3 solution to adjust the pH value of the electroplating wastewater to 6.0, and the distance between the anode 3 and the cathode 4 is 20 mm. During electrolysis, through 15V DC, Na 2 CO 3 Add the solution into the pH adjustment tank 9 of the electrolyte stirring device, and slowly add 5 mol / L Na 2 CO 3 The solution makes the pH value of the electroplating wastewater reach 6.8, and the electrolysis time is 4 hours; in the electrolysis process, the interval ti...

Embodiment 3

[0033] Refer to attached figure 1 , The electrolytic treatment device for electrolytic treatment of zinc-containing electroplating wastewater is basically the same as that of Example 1, wherein the cathode 4 uses a graphite electrode. The method for electrolytic treatment of zinc-containing electroplating wastewater is: the electroplating wastewater with a zinc concentration of 150.0 mg / L enters the electrolytic cell 1 through the feed port 7 as the electrolyte 2, and an appropriate amount of Na is added to the electrolyte 2 2 CO 3 The solution adjusts the pH value of the electroplating wastewater to 6.1, and the distance between the anode 3 and the cathode 4 is 22mm; during electrolysis, 10V direct current is passed, and Na 2 CO 3 Add the solution into the pH adjustment tank 9 of the electrolyte stirring device, and slowly add 5 mol / L Na 2 CO 3 The solution makes the pH value of the electroplating wastewater reach 7.0, and the electrolysis time is 2 hours; in the electrol...

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Abstract

The invention discloses a method for treating zinc-containing electroplating wastewater and recovering zinc by electrolysis. The method has the characteristics of simple process, no secondary pollution, high removal rate and recyclable deposited metallic zinc. The zinc-containing electroplating wastewater is subjected to electrolysis treatment by an electrolysis treatment zinc-containing electroplating wastewater device, which comprises an electrolytic bath and an electrolyte stirring apparatus, wherein the anode adopts a titanium-based platinum electrode; the cathode adopts a zinc electrode or a graphite electrode; and a pH meter is arranged in the electrolytic bath. The method for treating the zinc-containing electroplating wastewater by electrolysis comprises the following steps: before the electrolysis treatment, putting the zinc-containing electroplating wastewater serving as an electrolyte into the electrolytic bath, and adding alkali solution into the electrolyte to adjust the pH value of the electroplating wastewater; and adding weak base solution into the electrolyte during the electroplating to adjust the pH value of the electrolyte to between 6.0 to 7.9, and recycling the zinc precipitated from a negative plate by measuring the charge accumulation amount of the electrolyte.

Description

technical field [0001] The invention relates to the field of treatment of electroplating wastewater containing heavy metal ions, in particular to a method for electrolytically treating zinc-containing electroplating wastewater and recovering zinc. Background technique [0002] Industrial wastewater containing heavy metal ions discharged into the environment cannot be degraded and easily accumulates, which is very harmful. Heavy metal pollution is basically caused by wastewater discharge, so wastewater treatment technology should be developed in the direction of water recycling and metal recovery. The methods of treating wastewater containing heavy metal ions are divided into three categories: the first category is the method of removing heavy metal ions in wastewater through chemical reactions. The specific methods include neutralization precipitation method, sulfide precipitation method, chemical reduction method, and electrochemical reduction method. , ferrite co-precipit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F103/16C02F101/20
Inventor 李小忠苏晓梅包建松张素娟王琼岑艳
Owner ZHEJIANG NORMAL UNIVERSITY
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