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Treatment method of high-copper circuit board wastewater based on gradient functional anode electrolysis

A gradient function, anode electrolysis technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of difficulty in obtaining reclaimed water that meets the reuse standard, poor water treatment; patent literature , large consumption of pharmaceutical agents, etc., to achieve the effect of meeting the requirements of reuse, simple equipment and high added value

Active Publication Date: 2018-01-16
BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Patent document 201010169363.X discloses an environmentally friendly method of recycling circuit board etching solution to prepare ultra-fine copper powder. This method does not use electrolysis, but uses chemical reduction, which consumes a lot of chemicals and has poor batch reproducibility; Patent document 201310306377.5 discloses a method of preparing ultra-fine copper powder by using a combined method of dissolving copper on waste circuit boards and electrodeposition. Although this document uses the method of electrolysis, the raw material used is to dissolve the waste copper on the circuit board. The method of re-electrolysis, and adopts the diaphragm electrolysis method of cathode and anode division; Industrial wastewater is used as the source of raw water, and the anode is a soluble copper anode
Due to the high impurity content in the circuit board wastewater targeted by this application, the anode is an insoluble anode, the technical difficulty is even greater, and it is difficult to obtain reclaimed water that meets the reuse standard with the existing treatment process

Method used

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  • Treatment method of high-copper circuit board wastewater based on gradient functional anode electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of Ti / Sn-Sb-Ce gradient functional anode:

[0034] (1) Coarsening of the titanium plate: the Ti substrate is immersed in an oxalic acid solution with a mass percentage of 10%, boiled for 1 hour, and rinsed with deionized water. At this time, the surface of the Ti substrate becomes a rough pitted surface;

[0035] (2) Coating solution configuration: first, three different molar ratios (100:10:1, 60:10:1, 40:10:1) of SnCl 4 , SbCl 3 and CeCl 3 Dissolve in 6M hydrochloric acid to obtain a 2g / L solution, then add 2 times the volume of absolute ethanol to obtain a coating solution;

[0036] (3) Electrode preparation: the three kinds of coating liquids are painted on the surface of the titanium substrate in the order of brushing and drying, and the drying temperature after brushing is 120°C for 30 minutes; The Ti / Sn-Sb-Ce gradient functional anode was prepared by firing in a muffle furnace for 2 hours at a time.

[0037] Take the treatment of high copper-conta...

Embodiment 2

[0047] Take the treatment of high copper-containing wastewater from a circuit board factory in Wuxi as an example. The parameters of each unit are as follows:

[0048] (1) Gradient function anode electrolysis process: anode current density 150mA / cm 2 , Ti / Sn-Sb-Ce gradient functional anode was prepared as in Example 1. The cathode is a copper plate, and the electrolytic residence time is 2h;

[0049] (2) Induced crystallization sedimentation tank: the influent pH is 9, the precipitating agent is sodium sulfide, the concentration of sodium sulfide is 20%, and the molar ratio of dosing is 2:1; the filter material is activated carbon, the particle size is 0.25mm, and the hydraulic retention time is 2h.

[0050] (3) The reverse osmosis membrane model is PROC10 of Hyde Energy Company, and the nominal water production capacity is 1.65m 3 / h.

[0051] Raw water concentration: copper ion 18g / L, COD 3000mg / L, pH 3;

[0052] After gradient function anode electrolysis: copper ion 1...

Embodiment 3

[0057] Take the treatment of high copper-containing wastewater from a circuit board factory in Wuxi as an example. The parameters of each unit are as follows:

[0058] (1) Gradient function anode electrolysis process: anode current density 150mA / cm 2 , Ti / Sn-Sb-Ce gradient functional anode was prepared as in Example 1. The cathode is a titanium plate, and the electrolytic residence time is 1.5h;

[0059] (2) Induced crystallization sedimentation tank: the influent pH is 9, the precipitating agent is sodium sulfide solution, the mass concentration of sodium sulfide is 20%, the molar ratio of dosing is 2:1; the filter material is volcanic rock, the particle size is 0.25mm, and the hydraulic retention The time is 1.5h.

[0060] (3) The reverse osmosis membrane model is PROC10 of Hyde Energy Company, and the nominal water production capacity is 1.65m 3 / h.

[0061] Raw water concentration: copper ion 20g / L, COD 4000mg / L, pH 3;

[0062] After gradient function anode electroly...

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Abstract

The invention provides a gradient functional anodic electrolysis based treatment method for high-copper circuit board wastewater. The method comprises the steps: (1) electrolyzing the high-copper wastewater in a gradient functional anodic electrolytic bath; (2) enabling electrolyzed wastewater to enter an induced-crystallization precipitation tank, wherein a filter material is placed in the precipitation tank, and the high-copper wastewater is subjected to induced crystallization in the presence of a precipitant; and (3) enabling effluent, obtained after the induced crystallization, to enter a reverse osmosis procedure. According to the method provided by the invention, gradient functional anodic electrolysis and induced-crystallization precipitation procedures play a role in recovering copper ions; a product of electrolysis, i.e., ultrafine copper powder can be used for preparing base-metal slurry, and the added value is high; and the electrolytic process has a remarkable removing effect on organic substances, and the concentration of the organic substances entering reverse osmosis can be relatively low in light of the induced crystallization in the step (2), so that the requirements of reverse osmosis on long run are met. Copper is recovered, and the wastewater is purified, so that recycling requirements are met.

Description

technical field [0001] The invention belongs to the field of wastewater treatment by electrochemical methods, and in particular relates to a treatment method for wastewater from circuit board manufacturing. Background technique [0002] In the PCB (printed circuit board) industry, there are many processes that produce waste water with high concentrations of copper ions, such as single-layer board micro-etching, multi-layer board etching, electroplating and other processes. The liquid (copper ion concentration greater than 20g / L) is sold to professional manufacturers for treatment, and the low-concentration copper-containing wastewater is discharged into the enterprise wastewater treatment station, and treated by coagulation and sedimentation after pH adjustment (adding alkali). After initially meeting the standard, it will be discharged into the comprehensive sewage treatment plant in the park for further treatment, and the coagulated and sedimented sludge will be treated by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/461
CPCC02F1/001C02F1/441C02F1/46109C02F1/5236C02F1/5245C02F1/5281C02F9/00C02F2001/46133C02F2001/5218C02F2303/16
Inventor 汪诚文薛方勤赵雪峰付宏祥李艳孙利利王欣郝爽谭薇
Owner BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA
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