Recycling method and system of PCB (printed circuit board) etching waste liquid

A technology of PCB circuit board and treatment method, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, multi-stage water treatment, etc. The effect of low cost, low power consumption and simple process

Active Publication Date: 2016-05-04
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Other alkaline substances need to be added when adjusting the pH value. Since the wastewater is strongly acidic, the amount of alkaline substances consumed will be relatively large, and the pH needs to be readjusted after each stage of extraction, and the volume of waste liquid will continue to increase

Method used

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  • Recycling method and system of PCB (printed circuit board) etching waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The water quality of a circuit board wastewater is: copper 100g / L, hydrochloric acid concentration 3mol / L. During treatment, the raw waste water is transported to the diffusion dialyzer, and the recovered hydrochloric acid is 2.5mol / L, and the effluent of the diffusion dialysis device is pumped into the catalytic oxidation tower, and the effluent ensures that Cu 2+ Accounting for 95% of the total amount of Cu, the oxidized etching waste liquid is pumped to the bipolar membrane system, sulfuric acid is added to the bipolar membrane module through the dosing metering pump and pH interlock automatic control, and the output water of the bipolar membrane module is 260g / L of copper sulfate, two streams of 0.5mol / L hydrochloric acid, three streams of desalinated etching waste liquid, wherein the copper sulfate solution is sent to the evaporation crystallizer to recover industrial-grade copper sulfate, and the 0.5mol / L hydrochloric acid is passed through the evaporator or The ...

Embodiment 2

[0046] The water quality of a circuit board wastewater is: copper 150g / L, hydrochloric acid concentration 3.5mol / L. During treatment, the raw waste water is transported to the diffusion dialyzer, and the recovered hydrochloric acid is 3.3mol / L, and the effluent of the diffusion dialysis device is pumped into the catalytic oxidation tower, and the effluent ensures that Cu 2+ Accounting for 96% of the total amount of Cu, the oxidized etching waste liquid is pumped to the bipolar membrane system, sulfuric acid is added to the bipolar membrane module through the dosing metering pump and pH interlock automatic control, and the water output of the bipolar membrane module is 300g / L of copper sulfate, two streams of 0.8mol / L hydrochloric acid, three streams of desalinated etching waste liquid, wherein the copper sulfate solution is sent to the evaporation crystallizer to recover industrial-grade copper sulfate, and the 0.8mol / L hydrochloric acid is passed through the evaporator or Th...

Embodiment 3

[0048] The water quality of a circuit board wastewater is: the copper content is 180g / L, and the concentration of hydrochloric acid is 4mol / L. During treatment, the raw wastewater is sent to the diffusion dialyzer, and the recovered hydrochloric acid is 3.8mol / L, and the effluent of the diffusion dialysis device is pumped into the catalytic oxidation tower, and the effluent ensures that Cu 2+ Accounting for 94% of the total amount of Cu, the oxidized etching waste liquid is pumped to the bipolar membrane system, sulfuric acid is added to the bipolar membrane module through the dosing metering pump and pH interlock automatic control, and the output water of the bipolar membrane module is 330g / L of copper sulfate, two streams of 0.9mol / L hydrochloric acid, three streams of desalinated etching waste liquid, wherein the copper sulfate solution is sent to the evaporation crystallizer to recover industrial-grade copper sulfate, and the 0.9mol / L hydrochloric acid is passed through th...

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Abstract

The invention discloses a recycling method and system of a PCB (printed circuit board) etching waste liquid. The method adopts a technical process of diffusion dialysis, catalytic oxidation, bipolar membrane, evaporative crystallization and recrystallization, and comprises the following steps: sequentially passing the acidic chlorine-type copper etching waste liquid through a treatment system composed of a diffusion dialyzer, a catalytic oxidation device, a bipolar membrane dialyzer and an evaporative crystallizer to finally obtain crude copper sulfate crystals, and recrystallizing the crude copper sulfate crystals to obtain the commercially available high-purity copper sulfate. In the meanwhile, the hydrochloric acid separated from the diffusion dialyzer and bipolar membrane dialyzer can be concentrated through a rectification tower or graphite evaporator to obtain the industrial-grade concentrated hydrochloric acid. The technical process can ensure that the acidic etching waste liquid can be converted into the industrial-grade high-purity concentrated hydrochloric acid and high-purity copper sulfate after adding acid once, thereby implementing complete recycling of valuable resources in the waste liquid, achieving the environmental-economical dual benefits, and having favorable application prospects.

Description

technical field [0001] The invention relates to the field of advanced treatment of etching waste liquid, in particular to a method and system for recycling waste etching liquid of PCB circuit boards. Background technique [0002] With the rapid development of electronics, computer, communication, industrial control, automobile and other industries, the scale of printed circuit board industry is getting bigger and bigger. Especially in China, the production capacity has ranked first in the world. The etching process is to use chemical reaction to corrode the copper layer of non-circuit parts. This process will produce acidic etching waste liquid containing about 150g / L copper in the production of printed circuit boards. Environmental pollution is serious, and copper resources will also be lost. Due to the uneven regional distribution of the domestic PCB industry, most of them are distributed in South China and East China, which poses a huge challenge to the environmental capa...

Claims

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Application Information

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IPC IPC(8): C02F9/10C23F1/46C02F103/16
CPCC02F1/04C02F1/42C02F1/44C02F1/725C02F9/00C02F2103/16C02F2301/08C23F1/46
Inventor 林晓刘晨明向波
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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