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Method for recovering metal ions in electroplating wastewater

A technology for electroplating wastewater and metal ions, which is applied in metallurgical wastewater treatment, chemical instruments and methods, ion exchange water/sewage treatment, etc., and can solve problems such as troublesome treatment, large consumption of chemical reagents, and improvement in electroplating wastewater methods

Active Publication Date: 2021-06-01
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are all based on the destruction of heavy metal organic complexes by AOPs, but a large amount of chemical reagents (hydrogen peroxide and ferrous ions) are consumed during the Fenton reaction process, and a large amount of electroplating sludge is also generated during the chemical precipitation process, which brings troubles to subsequent treatment.
[0005] In summary, the existing electroplating wastewater treatment methods for metal-organic complexes still need to be improved.

Method used

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  • Method for recovering metal ions in electroplating wastewater
  • Method for recovering metal ions in electroplating wastewater
  • Method for recovering metal ions in electroplating wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Utilize ultrapure water to prepare a sample with a nickel citrate concentration of 300mg / L, divide the sample into 5 groups, and add 20mg / L free nickel ions, 10mmol / L persulfate, and 20mg / L free nickel to each group respectively. Ion+10mmol / L persulfate, 20mg / L free nickel ion+10mmol / L peroxodisulfate (PDS), 20mg / L free nickel ion+10mmol / L hydrogen peroxide (H 2 o 2 ), forming different Ni 2+ / Oxidant system, the pH is not conditional during the whole reaction process. Nickel removal kinetics figure 1 As shown, it can be seen that after 30min of reaction, Ni 2+ The removal rate of complexed nickel in / PMS system can reach about 95%, while Ni 2+ / PDS system, Ni 2+ / H 2 o 2 system and only Ni 2+ Or in the system with only PMS, the content of complexed nickel is almost unchanged.

Embodiment 2

[0039] Utilize ultra-pure water to prepare a sample with a nickel citrate concentration of 300mg / L, divide the sample into 5 groups, add 20mmol / L phosphite ion, 10mmol / L persulfate, 20mmol / L Phosphate ion + 10mmol / L persulfate, 20mmol / L phosphite ion + 10mmol / L peroxodisulfate, 20mmol / L phosphite ion + 10mmol / L hydrogen peroxide, constitute different HPO 3 2- / Oxidant system, the pH is not conditional during the whole reaction process. Nickel removal kinetics figure 2 As shown, it can be seen that after 30min of reaction, HPO 3 2- The removal rate of complexed nickel in the / PMS system can reach about 95%, while HPO 3 2- / PDS system, HPO 3 2- / H 2 o 2 systems and HPO-only 3 2- Or in the system with only PMS, the content of complexed nickel is almost unchanged.

Embodiment 3

[0041] A sample with a nickel citrate concentration of 300 mg / L was prepared with ultrapure water, and superphosphate and phosphite were added. Wherein, the concentration of superphosphate is controlled at 10mmol / L, the concentration of phosphite is gradually increased from 5mmol / L to 20mmol / L, and the pH value of the control system is 7.02 during the whole reaction process. Nickel removal kinetics image 3 As shown, it can be seen that with the increase of phosphite concentration, HPO 3 2- The removal rate of complex nickel in / PMS system is between 86% and 99.5%. At the same time, because the pH of the control system is neutral during the reaction, the possibility that the activation of PMS is caused by the addition of phosphite to make the system more alkaline is excluded. Moreover, as the reaction progressed, the concentration of free nickel ions in the system increased, and the removal rate of complexed nickel accelerated, which confirmed the conclusion that free nicke...

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Abstract

The invention discloses a method for recovering metal ions in electroplating wastewater. The method comprises the following steps: (1) adding persulfate into the electroplating wastewater, and activating the persulfate by using free nickel ions and phosphite ions in the electroplating wastewater so as to perform complex breaking treatment on complex metal ions in the electroplating wastewater by using the activated persulfate, thereby obtaining free-state metal ions; and (2) carrying out ion exchange treatment on the electroplating wastewater obtained in the step (1), and recovering the free-state metal ions. According to the method, the free nickel ions and phosphite ions in the electroplating wastewater are used as homogeneous catalysts to activate persulfate, complex-state metal ions in the electroplating wastewater are subjected to complex breaking through the activated persulfate, and then the free-state metal ions obtained through complex breaking are recycled through ion exchange treatment. The method has a good removal effect on metal ions in the electroplating wastewater, does not generate electroplating sludge, and has remarkable economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to the field of industrial waste treatment, in particular, the invention relates to a method for recovering metal ions in electroplating wastewater. Background technique [0002] In recent years, with the continuous development of the electroplating industry, especially the rapid development of township electroplating enterprises with multiple locations, the pollution diffusion area of ​​the electroplating industry has continued to expand, and electroplating wastewater has become one of the representative industrial wastewater that is difficult to treat. The most difficult components in electroplating wastewater are heavy metals, especially heavy metal ions in a complex state, which are difficult to degrade. Although there are many types of heavy metal treatment technologies in wastewater, such as chemical precipitation, chemical redox, membrane separation, ion exchange, etc., due to considerations of economy, operability, and mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C22B7/00C22B23/00C02F1/42C02F1/62C02F101/20C02F103/16
CPCC02F1/42C02F1/62C22B7/00C22B23/00C02F2101/20C02F2103/16Y02P10/20
Inventor 彭贵龙
Owner SOUTHWEST UNIV