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Purification process for waste etching liquid from circuit boards

A technology for etching waste liquid and purification treatment, which is applied in filtration treatment, heating water/sewage treatment, degassed water/sewage treatment, etc. It can solve the problems of natural environmental hazards, damage to biological tissues, carcinogenicity, etc., and achieve broad market prospects , good economic and environmental benefits

Inactive Publication Date: 2018-11-16
赣州中盛隆电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Etching waste liquid belongs to hazardous liquid waste, which contains a large amount of polluting components such as copper, ammonia nitrogen, chlorine, etc. If it is directly discharged into the environment without strict treatment, it will not only cause waste and loss of resources, but also cause harm to human beings and the natural environment. Very harmful, trace amounts of copper can damage biological tissues, excessive copper can cause cancer

Method used

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  • Purification process for waste etching liquid from circuit boards

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Effect test

Embodiment 1

[0029] A purification treatment process for circuit board etching waste liquid, comprising the steps of:

[0030] (1) Neutralization reaction

[0031] First, the acidic etching waste liquid is added to the alkaline etching waste liquid, and the pH value of the mixed solution is adjusted, and a neutralization reaction occurs between the two to generate basic copper chloride precipitation, and the pH of the mixed solution is 5;

[0032] (2) Pressure filtration separation and pulping

[0033] The mixed liquid after the neutralization reaction is subjected to solid-liquid separation to obtain a liquid phase 1, and then adding water to the basic copper chloride obtained after the reaction to make a slurry to obtain a basic copper chloride slurry, and simultaneously adding water to quicklime to prepare a lime slurry, spare;

[0034] (3) Alkali conversion process

[0035] Then lime slurry is added in the basic copper chloride slurry, stirred to obtain the mixture, the time of the ...

Embodiment 2

[0047] A purification treatment process for circuit board etching waste liquid, comprising the steps of:

[0048] (1) Neutralization reaction

[0049] First, the acidic etching waste liquid is added to the alkaline etching waste liquid, and the pH value of the mixed solution is adjusted, and a neutralization reaction occurs between the two to generate basic copper chloride precipitation, and the pH of the mixed solution is 6;

[0050] (2) Pressure filtration separation and pulping

[0051] The mixed liquid after the neutralization reaction is subjected to solid-liquid separation to obtain a liquid phase 1, and then adding water to the basic copper chloride obtained after the reaction to make a slurry to obtain a basic copper chloride slurry, and simultaneously adding water to quicklime to prepare a lime slurry, spare;

[0052] (3) Alkali conversion process

[0053] Then lime slurry is added in the basic copper chloride slurry, stirred to obtain the mixture, the time of the ...

Embodiment 3

[0065] A purification treatment process for circuit board etching waste liquid, comprising the steps of:

[0066] (1) Neutralization reaction

[0067] First, the acidic etching waste liquid is added to the alkaline etching waste liquid, and the pH value of the mixed solution is adjusted, and a neutralization reaction occurs between the two to generate basic copper chloride precipitation, and the pH of the mixed solution is 7;

[0068] (2) Pressure filtration separation and pulping

[0069] The mixed liquid after the neutralization reaction is subjected to solid-liquid separation to obtain a liquid phase 1, and then adding water to the basic copper chloride obtained after the reaction to make a slurry to obtain a basic copper chloride slurry, and simultaneously adding water to quicklime to prepare a lime slurry, spare;

[0070] (3) Alkali conversion process

[0071] Then lime slurry is added in the basic copper chloride slurry, stirred to obtain the mixture, the time of the ...

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Abstract

The invention discloses a purification process for waste etching liquid from circuit boards. The purification process adopts a solid-phase flow sedimentation separation technology and an ammonia-nitrogen vapor absorption technology, and the two technologies allow the ammonia-nitrogen content in condensate water to be less than 10 ppm after evaporating ammonia-nitrogen waste liquid and allow ammonium chloride in the waste liquid to be converted into ammonia water and calcium chloride products meeting standards. The purification process achieves good economic and environmental benefits and has broad market prospects.

Description

technical field [0001] The invention relates to the field of sewage treatment technology, in particular to a purification treatment process for circuit board etching waste liquid. Background technique [0002] With the continuous development of the PCB industry, the environmental protection issues of this industry are becoming more and more important. One of the main pollution is the large amount of copper-containing etching waste produced in the etching process. This waste liquid mainly comes from the PCB etching process. The etching liquid can corrode the excess copper foil on the circuit board, so that the concentration of copper ions in the etching liquid increases continuously. When the content of copper ions in the etching liquid reaches a certain concentration, the etching liquid corrodes The efficiency of copper will gradually decrease until it fails, and it will be discharged as etching waste. Etching waste liquid belongs to hazardous liquid waste, which contains a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01G3/02C01C1/02C01F11/28
CPCC01C1/026C01F11/28C01G3/02C02F1/001C02F1/04C02F1/20C02F1/66C02F9/00
Inventor 揭添增古云生高永忠石磊宋自成
Owner 赣州中盛隆电子有限公司
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