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Cyclic regeneration and copper extraction process for printed circuit board etching waste solution

A printed circuit board, copper extraction process technology, applied in the direction of process efficiency improvement, etc., can solve the problem of increasing device operating costs and maintenance costs, high requirements for extraction agent phase separation time, low operating reliability and stability, etc. problems, to achieve good economic and social benefits, low maintenance costs, and low investment costs

Active Publication Date: 2011-11-23
CHONGQING KOOPPER CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the traditional extraction → stripping process has disadvantages such as high cost, high requirements on operating conditions, complex process control, low operational reliability and stability, etc.
In addition, traditional extraction equipment, whether it is a mixing-settling tank or a centrifugal extractor, has very high requirements on the phase separation time of the extractant
It also requires a special design to discharge the emulsion layer and interface dirt generated during the extraction process, which further increases the operating and maintenance costs of the device

Method used

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  • Cyclic regeneration and copper extraction process for printed circuit board etching waste solution
  • Cyclic regeneration and copper extraction process for printed circuit board etching waste solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, 100L of the alkaline waste etching solution in the first storage tank H1 is filtered through the first filter g1 to remove impurities, and the obtained waste etching solution is stored in the second storage tank H2. Put the impurity-removing waste etching solution in the second storage tank H2 and 100L of Mextral PCB-2011b extractant into the extraction kettle A and stir for 0.5 hours for extraction. Stop stirring and let the layers stand for 20 minutes. Liquid separation, the upper copper-containing organic phase in the extraction kettle A is left in the extraction kettle, and the extracted waste etching solution of the lower layer is put into the third storage tank H3. After the sampling analysis is qualified, the second filter g2 is filtered, and the filtrate is stored in the fourth storage tank H4, and the formula components of the etching solution are added for preparation to obtain a regenerated etching solution, which is stored in the ...

Embodiment 2

[0038] Such as figure 1 As shown, 5000L alkaline waste etching solution in the first storage tank H1 is filtered through the first filter g1 to remove impurities, and the obtained waste etching solution is stored in the second storage tank H2. Put the impurity-removing waste etching solution in the second storage tank H2 and 6000L of Mextral PCB-2011b extractant into the extraction kettle A and stir for 0.5 hours for extraction. Stop stirring and let the layers stand for 20 minutes. Liquid separation, the upper copper-containing organic phase in the extraction kettle A is left in the extraction kettle, and the extracted waste etching solution of the lower layer is put into the third storage tank H3. After the sampling analysis is qualified, the second filter g2 is filtered, and the filtrate is stored in the fourth storage tank H4, and the formula components of the etching solution are added for preparation to obtain a regenerated etching solution, which is stored in the fifth...

Embodiment 3

[0042] Filter 200L of the acid waste etching solution through a filter to obtain the waste etching solution for removal of impurities. Put the waste etching solution and 400L of Mextral PCB-2011a extractant into the extraction kettle A and stir for 0.5 hours for extraction. Stop stirring and let the layers stand for 20 minutes. Liquid separation, the upper copper-loaded organic phase is kept in the extraction kettle A, and the extracted waste etching solution of the lower layer is put into the third storage tank H3. After the sampling analysis is qualified, it is filtered, and the filtrate is stored in the fourth storage tank H4, and the ingredients of the etching solution formula are added to prepare the regenerated etching solution.

[0043] Add 200 L of 0.1% sodium bicarbonate solution to the copper-loaded organic phase left in extraction kettle A, stir and wash for 40 minutes. Stop stirring and let the layers stand for 20 minutes. The lower layer of sodium bicarbonate w...

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Abstract

The invention relates to a cyclic regeneration and copper extraction process for printed circuit board etching waste solution. By the process, the etching waste solution can be recycled, and copper can be extracted from the etching waste solution and electrolyzed to form high-purity copper. In the process, a reaction kettle is used as the main treatment device, and intermittent operation is used as a main treatment mode; and the process is simple and convenient to operate, and can avoid many operating fault problems in the traditional process. Full phase separation is realized by full standing after extraction or back extraction, so that emulsification is reduced, and drift loss is reduced. Because closed treatment is adopted in the production process, irritant gas is not leaked, toxic orharmful liquid is not discharged, and the process is environment-friendly. The process is suitable for various production scales, is low in investment and wide in application range, and has good economic benefit and social benefit.

Description

technical field [0001] The invention relates to a process for recycling chemical solutions produced by printed circuit boards, in particular to [0002] The invention relates to a method for extracting copper from printed circuit board etching waste liquid and recycling the etching waste liquid. Background technique [0003] Extraction → stripping → electrowinning process is often used in the treatment of printed circuit board etching waste. This is because it can regenerate the etching solution while recovering metallic copper. Ideally, the entire process will not produce any waste. Among them, the extraction → stripping unit is the key to the success of the process. The traditional extraction → stripping unit includes unit operations such as extraction, washing, and stripping, which are carried out in different extraction equipment. This requires these devices to work together, and any abnormality of any device will cause the failure of the entire process. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/46C22B7/00C22B3/26C22B15/00
CPCY02P10/20
Inventor 徐志刚汤启明邹潜
Owner CHONGQING KOOPPER CHEM IND
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