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Treatment method of copper-containing etching liquid

A treatment method, copper etching technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as unsatisfactory treatment effect, cumbersome process, and secondary pollutants , to avoid waste of resources, low impurity content, and save raw material costs

Active Publication Date: 2014-05-21
CHONGQING LONGJIAN METAL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current treatment methods for copper-containing etching solutions have unsatisfactory treatment effects.
The current processes mainly include the following: add quicklime to the acidic etching solution to form basic copper chloride mud, and then roast at high temperature, which will produce a large amount of greenhouse gases; use acidic and alkaline etching solution to mix and neutralize to form Precipitate copper hydroxide to remove chloride ions and ammonium ions. This method will produce a large amount of wastewater containing chloride ions and ammonium ions; direct precipitation with sodium hydroxide to obtain copper hydroxide will produce wastewater, and the wastewater will be treated later. Cationic resin initial treatment, adding sodium hypochlorite to remove ammonia nitrogen, adding polyaluminum chloride to remove heavy metal ions, adding polyacrylamide to settle, etc. This method is not only cumbersome, but also produces secondary pollutants and waste water containing heavy metal ions after sewage treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A processing method for copper-containing etching solution, the operation method is as follows:

[0027] 1. Add sodium hydroxide dropwise to the etching solution with a copper content of 130 g / L, and adjust the pH value to 2.0;

[0028] 2. Add 60g / L of aluminum (model: 1080) for the first reaction at a temperature of 75°C. During the reaction, use a Roots blower to blow air from the bottom, and react until the copper content in the solution is 8g / L;

[0029] 3. Let stand for 25 minutes and filter;

[0030] 4. Add 5g / L H to the filtrate 2 o 2 and aluminum 8g / L, the temperature is 60°C, during the reaction process, the copper content in the solution is 0.02g / L by feeding air from the bottom;

[0031] 5. After standing for 25 minutes, filter, the precipitate is electronic grade copper powder, and the filtrate is polyaluminum chloride flocculant;

[0032] 6. Wash the copper powder with deionized water and distilled water for 3 times, each time for 0.5h, and centrifuge ...

Embodiment 2

[0036] A processing method for copper-containing etching solution, the operation method is as follows:

[0037] 1. Add a certain amount of copper powder rinsing water to the etching solution with a copper content of 150 g / L, and then add sodium hydroxide dropwise to adjust the pH value to 3.0;

[0038] 2. Add 80g / L of aluminum (model: 1080A) for the first reaction at a temperature of 85°C. During the reaction, a Roots blower is used to feed air from the bottom until the copper content in the solution is 7g / L;

[0039] 3. Let stand for 35 minutes and filter

[0040] 4. Add 6g / L H to the filtrate 2 o 2 and an appropriate amount of aluminum 7g / L, the temperature is 65°C, during the reaction process, air is passed through the bottom, and the copper content in the solution is reacted to 0.03g / L;

[0041] 5. After standing for 28 minutes, filter, the precipitate is electronic grade copper powder, and the filtrate is polyaluminum chloride flocculant;

[0042] 6. Wash the copper ...

Embodiment 3

[0046] A processing method for copper-containing etching solution, the operation method is as follows:

[0047] 1. Add a certain amount of copper powder rinsing water to the etching solution with a copper content of 145 g / L, and then add sodium hydroxide dropwise to adjust the pH value to 2.2;

[0048] 2. Add 65g / L of aluminum (model: 107000A) for the first reaction at a temperature of 80°C. During the reaction, a Roots blower is used to feed air from the bottom until the copper content in the solution is 6g / L;

[0049] 3. Let stand for 30 minutes and filter;

[0050] 4. Add 5.3g / L H to the filtrate 2 o 2 and an appropriate amount of aluminum 6g / L, the temperature is 70°C, and the copper content in the solution is 0.03g / L by passing air from the bottom during the reaction;

[0051] 5. After standing for 32 minutes, filter, the precipitate is electronic grade copper powder, and the filtrate is polyaluminum chloride flocculant;

[0052] 6. Wash the copper powder with deionize...

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Abstract

The invention provides a treatment method of a copper-containing etching liquid. The treatment method is characterized by comprising the following steps: the copper content of the etching solution is 130 g / L-150 g / L, the pH is adjusted to 2.0-3.0, a reaction is carried out by adding 60-80 g / L of aluminum, the temperature is 75-85 DEG C, air is introduced during the reaction process, after the reaction, a precipitate is an electronic-grade copper powder, and a solution is a polymeric aluminum chloride flocculant. Substances contained in the etching liquid and characteristics thereof are fully utilized, the effects of the substances are all fully utilized, finally the wastewater treatment is achieved, the high-quality products extremely having application value are obtained, the waste of resources is avoided, and the raw material cost and the reagent cost are saved.

Description

technical field [0001] The invention belongs to the field of recovery and utilization of industrial waste liquid, and in particular relates to a method for recovery and treatment of copper-containing etching liquid. Background technique [0002] In the electronics industry, the manufacture of printed circuit boards not only consumes a lot of water and energy, but also produces chemicals that are harmful to the environment and human health. Larger industrial wastewater. Copper-containing etching waste liquid seriously pollutes the environment, affects the survival of microorganisms in water, destroys the structure of soil aggregates, and affects the growth of crops. At present, there are more than 3,000 printed circuit board manufacturing enterprises in my country, and the discharge of etching solution is about 8 kt / d, and it is still increasing gradually. [0003] However, the current treatment methods for copper-containing etching solutions have unsatisfactory treatment e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C22B7/00C01G3/02
CPCY02P10/20
Inventor 秦威
Owner CHONGQING LONGJIAN METAL MFG
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