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Method for recycling acidic copper-containing ammonium-containing etching waste liquid

A technology of etching waste liquid and acidity, which is applied in the field of recycling and utilization of acidic copper-containing ammonium-containing etching waste liquid, which can solve the problems of strong corrosiveness and toxicity, undefined etching, and inapplicable etching waste liquid treatment, so as to achieve no secondary pollution , low cost and high value in use

Active Publication Date: 2022-05-31
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main operation in this process is two electrolysis, but the anions in the etching waste liquid are not specified. If it is a common chloride ion, the electrolysis product includes chlorine gas, which is highly corrosive and toxic, and it is also not suitable for complex component etching waste. liquid handling

Method used

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  • Method for recycling acidic copper-containing ammonium-containing etching waste liquid

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Embodiment 1

[0057] This embodiment provides a method for recycling acidic copper-containing ammonium-containing etching waste liquid, the process flow diagram of the method is as follows figure 1 shown, including the following steps:

[0058] (1) The acidic copper-containing ammonium-containing etching waste liquid to be treated is subjected to nanofiltration treatment, and the source of the acidic copper-containing ammonium-containing etching waste liquid is the circuit board etching industry, and its composition includes copper chloride, ammonium chloride and hydrogen chloride, Wherein the concentration of copper is 5wt%, and the pH value is 3, and the pressure of described nanofiltration treatment is 1.5MPa, and the aperture of nanofiltration membrane used is 2nm, obtains permeate and retentate, and the main composition of described retentate comprises chlorine Copper chloride, the main composition of the permeated liquid includes ammonium chloride;

[0059] (2) the retentate obtained...

Embodiment 2

[0063] This embodiment provides a method for recycling acidic copper-containing ammonium-containing etching waste liquid, the method comprising the following steps:

[0064] (1) The acidic copper-containing ammonium-containing etching waste liquid to be treated is subjected to nanofiltration treatment, and the source of the acidic copper-containing ammonium-containing etching waste liquid is the circuit board etching industry, and its composition includes copper chloride, ammonium chloride and hydrogen chloride, Wherein the concentration of copper is 1wt%, and the pH value is 6, and the pressure of described nanofiltration treatment is 2.5MPa, and the pore diameter of nanofiltration membrane used is 1nm, obtains permeate and retentate, and the main composition of described retentate comprises chlorine Copper chloride, the main composition of the permeated liquid includes ammonium chloride;

[0065] (2) the retentate obtained in step (1) is mixed with sulfuric acid, the volume ...

Embodiment 3

[0069] This embodiment provides a method for recycling acidic copper-containing ammonium-containing etching waste liquid, the method comprising the following steps:

[0070] (1) The acidic copper-containing ammonium-containing etching waste liquid to be treated is subjected to nanofiltration treatment, and the source of the acidic copper-containing ammonium-containing etching waste liquid is the circuit board etching industry, and its composition includes copper chloride, ammonium chloride and hydrogen chloride, Wherein the concentration of copper is 8wt%, and the pH value is 1, and the pressure of described nanofiltration treatment is 0.5MPa, and the aperture of nanofiltration membrane used is 3nm, obtains permeate and retentate, and the main composition of described retentate comprises chlorine Copper chloride, the main composition of the permeated liquid includes ammonium chloride;

[0071] (2) the retentate obtained in step (1) is mixed with sulfuric acid, the volume ratio...

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Abstract

The invention provides a method for recycling an acidic copper-containing ammonium-containing etching waste liquid, which comprises the following steps: carrying out nanofiltration treatment on the acidic copper-containing ammonium-containing etching waste liquid to be treated to obtain a permeate liquid and a trapped liquid; mixing the trapped fluid with sulfuric acid, and performing evaporation treatment to obtain evaporation mother liquor; and the evaporation mother liquor is electrolyzed, and the copper elementary substance is obtained. According to the method, the valuable components in the etching waste liquid are separated and recycled sequentially through nanofiltration, evaporation and electrolysis according to the composition characteristics of the etching waste liquid, all the components are separated thoroughly and can be reused, and the obtained copper product is high in purity and utilization value; the method is easy to operate, low in cost, capable of being suitable for recycling treatment of waste liquid with complex components and free of secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of waste liquid recycling and relates to a method for recycling acid copper-containing ammonium-containing etching waste liquid. Background technique [0002] Printed circuit board is an important part of electronic products, and its production process has formed a large-scale industry. It is one of the important branches of the electronics industry. According to the raw materials used in the production of printed circuit boards and the production process, a large amount of etching waste liquid will be generated. Due to the It has the characteristics of various types, high toxicity, strong corrosion, etc., and needs to be treated and recycled to avoid environmental pollution and waste of resources. [0003] According to the composition of commonly used etching solutions, it can be divided into acid etching solution and alkaline etching solution. Copper-containing etching solution is the most commonly used ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C23F1/46C23F1/18
CPCC25C1/12C23F1/46C23F1/18Y02P10/20
Inventor 陈琪
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD