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A method for treating copper-containing electroplating wastewater and recovering copper by using sulfide precipitation method

A technology of sulfide precipitation and copper electroplating, applied in the field of environmental engineering, can solve the problems of easy formation of colloids, secondary pollution, and high processing costs, and achieve the effect of avoiding loss and simplifying the operation process.

Active Publication Date: 2020-05-12
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particles of sulfide precipitates are small and easy to form colloids. It is necessary to add flocculants to assist precipitation, and the treatment cost is relatively high.
At the same time, the sulfide precipitation agent remains in the water, and when it encounters acid, it will generate hydrogen sulfide gas and cause secondary pollution. Therefore, this method is not widely used in practical applications.

Method used

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  • A method for treating copper-containing electroplating wastewater and recovering copper by using sulfide precipitation method
  • A method for treating copper-containing electroplating wastewater and recovering copper by using sulfide precipitation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The electroplating wastewater is taken from an electroplating factory in Shandong, which mainly produces copper-zinc-nickel plating parts. The specific processing steps are as follows:

[0049] (1) The storage tank collects waste water

[0050] The storage tank collects the copper-containing electroplating wastewater discharged from the electroplating workshop, and the initial pH of the wastewater is 1.5; after measurement, the main metal content of the wastewater is: Cu 121mg / L, Zn 64mg / L, Ni 76mg / L, Fe 73mg / L, and other heavy metals All lower than 5mg / L.

[0051] (2) Sulfide Precipitated Copper

[0052] The electroplating wastewater in the water storage tank enters the sulfide reaction tank I, and adding an initial concentration to the reaction tank is a sodium sulfide solution of 0.5mol / L, and the sodium sulfide addition is 95% of the amount of copper in the wastewater; then control the pH value of the system lower than 2.0 and stirred for 10 minutes; after the re...

Embodiment 2

[0057] The electroplating wastewater is taken from an electroplating factory in Jiangsu, which mainly produces copper-plated parts. The specific processing steps are as follows:

[0058] (1) The storage tank collects waste water

[0059] The storage tank collects the copper-containing electroplating wastewater discharged from the electroplating workshop. The initial pH of the wastewater is 3.4, and the pH is adjusted to 3.0. After determination, the main metal content of the wastewater is: Cu 130mg / L, Zn 34mg / L, Ni 9mg / L, Fe 57mg / L, and other heavy metal contents are all lower than 5mg / L.

[0060] (2) Sulfide Precipitated Copper

[0061] The electroplating wastewater in the water storage tank enters the sulfide reaction tank I, and adding an initial concentration in the reaction tank is a sodium sulfide solution of 1.5mol / L, and the sodium sulfide addition is 90% of the amount of copper in the wastewater; then control the pH value of the system lower than 3.5, stirring and ...

Embodiment 3

[0066] The electroplating wastewater is taken from an electroplating factory in Jiangsu, which mainly produces copper-plated parts. The specific processing steps are as follows:

[0067] (1) The storage tank collects waste water

[0068] The storage tank collects the copper-containing electroplating wastewater discharged from the electroplating workshop. The initial pH of the wastewater is 3.4, and the pH is adjusted to 2.0. After determination, the main metal content of the wastewater is: Cu 130mg / L, Zn 34mg / L, Ni 9mg / L, Fe 57mg / L, and other heavy metal contents are all lower than 5mg / L.

[0069] (2) Sulfide Precipitated Copper

[0070] The electroplating wastewater in the storage tank enters the sulfide reaction tank I, and the sodium sulfide solution with an initial concentration of 1.0mol / L is added to the reaction tank, and the sodium sulfide addition is 80% of the amount of copper in the wastewater. Then control the pH value of the system to be lower than 3.0, stir an...

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Abstract

The invention belongs to the technical field of environmental engineering and particularly relates to a method for copper-containing electroplating wastewater treatment and copper recovery by a sulfide precipitation method. The method includes: adjusting a pH value of copper-containing electroplating wastewater to 1.5-3.0, then adding sulfide solution, stirring for reaction, and performing solid-liquid separation after reaction is finished to obtain pretreated wastewater and copper sulfide precipitate; adding part of solid sulfides into the pretreated wastewater, and performing primary stirring reaction; adding residual solid sulfides, and performing secondary stirring reaction; adding a flocculating agent after secondary stirring reaction is finished, and stirring for reaction; adjustingsystem pH to 7.0-8.0 after reaction, and performing solid-liquid separation to obtain mixed heavy metal sulfides and supernatant reaching the emission standard. By the sulfides, efficient separation and recovery of copper from the copper-containing electroplating wastewater is realized while harmlessness of the electroplating wastewater is realized as well, and simplicity in operation, stability in operation, low cost, high recycling level and freeness of secondary pollution are achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for treating copper-containing electroplating wastewater and recovering copper by using a sulfide precipitation method. Background technique [0002] In the electroplating process, the copper plating layer is usually used as the bottom layer of nickel plating, tin plating, chrome plating, silver plating, and gold plating to improve the bonding force between the base metal and the surface coating and the corrosion resistance of the coating. Therefore, copper-containing electroplating wastewater is used in the electroplating industry. It is very common, and this kind of industrial wastewater usually contains a variety of heavy metals. The discharge of such wastewater without proper treatment not only causes environmental pollution, but also causes waste of resources, which is not conducive to the green and sustainable development of the indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C22B7/00C22B15/00C02F101/20C02F103/16
CPCC02F1/38C02F1/5236C02F1/56C02F1/62C02F1/66C02F9/00C02F2001/007C02F2101/20C02F2103/16C22B7/006C22B15/0089Y02P10/20
Inventor 张瑞昌魏学锋王辉朱书法周鸣
Owner HENAN UNIV OF SCI & TECH
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