Method for treating cyanogen-containing copper-containing electroplating wastewater by electrolysis and recycling copper

A technology of electrolytic treatment and copper electroplating, which is applied in the direction of water/sewage treatment, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve the problems of difficult reuse of effluent, excessive discharge, complicated process, etc., and achieve easy precipitation separation, electrolysis The effect of improving efficiency and increasing the reaction speed of cyanide breaking

Inactive Publication Date: 2014-07-30
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The purpose of the present invention is to provide a method with simple process and easy process for the disadvantages of the existing cyanide-containing and copper-containing electroplating wastewater treatment technology, such as complex process, difficult

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  • Method for treating cyanogen-containing copper-containing electroplating wastewater by electrolysis and recycling copper

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Effect test

Embodiment 1

[0042] The method for electrolytic treatment of electroplating wastewater containing cyanide and copper is as follows: before electrolytic treatment, electroplating wastewater with concentrations of cyanide and copper of 2600 mg / L and 2200 mg / L respectively is put into reaction tank 1; Sodium; measured OH in wastewater - The concentration is 3.5 times of the CN concentration, and the copper hydroxide precipitate and filtrate are filtered; the above-mentioned filtrate flows into the electrolytic cell 5 through the pipeline 4 as the electrolyte, and the pipeline is provided with a shut-off valve 12; simultaneously, the hydrogen in the reaction tank 1 is oxidized Copper recovery; start electrolysis, add mesoporous granular activated carbon and NaCl through the second hopper 7 at the upper end of the electrolytic cell 6 according to the ratio of 0.06% and 0.4% of the electrolyte, conduct direct current electrolysis, and strengthen between the positive and negative poles 8 and 9 Th...

Embodiment 2

[0044] Before the electrolytic treatment, the concentration of cyanide and copper is respectively 5800mg / L and 3100mg / L electroplating waste water is put into reaction tank 1 in cyanide and copper concentration respectively; Add sodium hydroxide through the hopper 2 of reaction tank 1 top; Measure the wastewater Medium OH - Concentration is CN - 3 times of the concentration, filter to get copper hydroxide precipitate and filtrate; the above-mentioned filtrate flows into the electrolytic cell 5 through the pipeline 4 as electrolyte, and the pipeline is provided with a shut-off valve 12; simultaneously, the copper hydroxide in the reaction tank 1 is reclaimed; Start electrolysis, add mesoporous granular activated carbon and NaCl through the second hopper 7 at the upper end of the electrolytic cell 6 at a ratio of 0.1% and 0.5% of the electrolytic solution, conduct direct current electrolysis, and strengthen the electrostatic field 200V between the positive and negative poles 8 a...

Embodiment 3

[0046] Before the electrolytic treatment, put the electroplating wastewater with cyanide and copper concentrations of 930mg / L and 817mg / L respectively into the reaction tank 1; add sodium hydroxide through the hopper 2 at the upper end of the reaction tank 1; measure the OH in the wastewater - Concentration is CN - 3.7 times of the concentration, filter to obtain copper hydroxide precipitate and filtrate; the above-mentioned filtrate flows into the electrolytic cell 5 as electrolyte through the pipeline 4, and the pipeline is provided with a shut-off valve 12; simultaneously the copper hydroxide in the reaction tank 1 is reclaimed; Start electrolysis, add mesoporous granular activated carbon and NaCl by the ratio of 0.04% and 0.4% of the electrolytic solution through the second hopper 7 at the upper end of the electrolytic cell 6, conduct direct current electrolysis, and strengthen the electrostatic field 150V between the positive and negative poles 8 and 9 / cm, the direction ...

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Abstract

The invention relates to a method for treating cyanogen-containing copper-containing electroplating wastewater by electrolysis and recycling copper. Compared with the existing method for treating cyanogen-containing copper-containing electroplating wastewater, the method disclosed by the invention has the advantages of being simple in process, free of secondary pollution, high in removal rate, capable of recycling deposited metal copper and recycling effluent. The method for treating cyanogen-containing copper-containing electroplating wastewater by electrolysis comprises the following steps: adding sodium hydroxide in the cyanogen-containing copper-containing electroplating wastewater to regulate concentration of OH<-> in wastewater, filtering to obtain copper hydroxide copper precipitate and filtrate; adding a certain amount of mesoporous granulate active carbon and NaCl by taking the filtrate as electrolyte; applying direct-current power for electrolysis, externally applying electrostatic fields between positive and negative electrodes, wherein electric field direction is from the positive electrode to the negative electrode; recycling the separated-out copper after separating out copper from the negative electrode; ending electrolysis when residual quantity of Cu<2+> and CN<-> in electrolyte is respectively less than 0.5mg/L and 0.1mg/L, and treating the granulate active carbon by hydrochloric acid and then recycling after separating the precipitate.

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 cyanide and copper and recovering copper. 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. , fer...

Claims

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Application Information

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IPC IPC(8): C02F1/461C25C1/12C02F103/16
CPCY02P10/20
Inventor 李小忠徐强强王芳刘俊华
Owner ZHEJIANG NORMAL UNIVERSITY
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