Method for treating nickel-containing electroplating wastewater and recovering nickel 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 difficult control, secondary pollution, low removal rate, etc., and reduce the electrolysis of hydrogen on the cathode plate The effect of side effects

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

[0015] The purpose of the present invention is to provide a simple process, easy to control, no secondary pollution, aiming at the disadvantages of complex process, difficult control, secondary pollution and low removal rate in the existing te

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

Examples

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[0034] Example 1:

[0035] Refer to attached figure 1, a method for electrolytically treating nickel-containing electroplating wastewater and recovering nickel. The electrolytic treatment of nickel-containing electroplating wastewater is carried out through an electrolytic treatment device for nickel-containing electroplating wastewater. The electrolytic treatment device for nickel-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 nickel 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 ...

Example Embodiment

[0037] Example 2:

[0038] Refer to attached figure 1 , The electrolytic treatment device for electrolytic treatment of nickel-containing electroplating wastewater is the same as in Example 1.

[0039] The method for electrolytic treatment of nickel-containing electroplating wastewater is: the electroplating wastewater with a nickel concentration of 100.0 mg / L enters the electrolytic cell 1 through the feed port 7 as the electrolyte 2, and an appropriate amount of Ca(OH) is added to the electrolyte 2 2 The solution adjusts the pH value of the electroplating wastewater to 6.5, and the distance between the anode 3 and the cathode 4 is 20mm; during electrolysis, 10V direct current is passed, and Ca(OH) 2 Add the solution into the pH adjustment tank 9 of the electrolyte stirring device, and slowly add 0.1mol / L Ca(OH) under the anode 3 through the outlet hole 12 on the infusion tube 11 of the electrolyte stirring device 2 The solution makes the pH value of the electroplating wast...

Example Embodiment

[0040] Example 3:

[0041] Refer to attached figure 1 , The electrolytic treatment device for electrolytic treatment of nickel-containing electroplating wastewater is basically the same as Example 1, wherein the cathode 4 uses a graphite electrode. The method for electrolytic treatment of nickel-containing electroplating wastewater is: the electroplating wastewater with a nickel concentration of 100.0 mg / L enters the electrolytic cell 1 through the feed port 7 as the electrolyte 2, and an appropriate amount of NaOH solution is added to the electrolyte 2 to reduce the electroplating wastewater. The pH value is adjusted to 6.9, and the distance between the anode 3 and the cathode 4 is 15mm; during electrolysis, 8V direct current is applied, and the NaOH solution is added to the pH adjustment tank 9 of the electrolyte stirring device, and the infusion tube 11 of the electrolyte stirring device is passed The liquid outlet hole 12, slowly add 1mol / L NaOH solution under the anode 3...

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Abstract

The invention discloses a method for treating nickel-containing electroplating wastewater and recovering nickel by electrolysis. The method has the characteristics of simple process, no secondary pollution, high removal rate and recyclable deposited metallic nickel. The nickel-containing electroplating wastewater is subjected to electrolysis treatment by an electrolysis treatment nickel-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 nickel electrode or a graphite electrode; and a pH meter is arranged in the electrolytic bath. The method for treating the nickel-containing electroplating wastewater by electrolysis comprises the following steps: before the electrolysis treatment, putting the nickel-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 the aqueous alkali into the electrolyte during the electroplating to adjust the pH value of the electrolyte to between 6.0 to 9.0, and recycling the nickel 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 electroplating wastewater containing nickel and recovering nickel. Background technique [0002] Most of the heavy metal pollution comes from the discharge of industrial wastewater. Heavy metal ions in wastewater are not easy to degrade in the environment, and can accumulate and enrich in aquatic organisms and crop tissues, and cause harm to human health through bioaccumulation, bioconcentration, and biomagnification in drinking water and food chains. To control the pollution caused by industrial wastewater containing heavy metals is not only to remove heavy metals, but also to develop recycling technology to make waste resources. Treatment methods can be divided into three types: the first one is chemical method, including neutralization precipitation method, sulfide precipitation method, ch...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/62C02F103/16C02F101/20
Inventor 李小忠苏晓梅张洁琼叶少君蔡霞林晓琴
Owner ZHEJIANG NORMAL UNIVERSITY
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