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Method for extracting copper from printed circuit board acidic spent etching solution and preparing poly ferric chloride

A technology of acidic etching waste liquid and polyferric chloride, which is applied in the field of resource utilization of industrial waste and water environment treatment, can solve problems such as inapplicability, and achieve the effects of reducing recycling costs, low corrosion, and high recycling purity

Inactive Publication Date: 2009-01-28
HUNAN VARY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in the composition of PCB acidic etching waste liquid, the above method is not applicable to the use of electrolyzed acidic etching waste liquid for the preparation of polyferric chloride

Method used

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  • Method for extracting copper from printed circuit board acidic spent etching solution and preparing poly ferric chloride
  • Method for extracting copper from printed circuit board acidic spent etching solution and preparing poly ferric chloride

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0063] ② Preparation of iron-containing liquid

[0064] Add iron oxide to the solution replaced by reduced iron, and prepare iron-containing liquids with different concentrations by adding exogenous iron-containing substances according to the concentration requirements of the prepared iron-containing liquid. The reaction formula of this step is:

[0065] Fe 2 o 3 +6H + →2Fe 3+ +3H 2 o

[0066] ③ Preparation of Polyferric Chloride

[0067] The prepared iron-containing liquid undergoes a series of oxidation, hydrolysis and polymerization reactions to obtain polyferric chlorides with different iron contents.

[0068] Fe 3+ Hydrolyzed to varying degrees, Fe 3+ and OH - The indicators of products with different proportions are different, and the following reactions mainly occurred:

[0069] wxya 3+ +yH 2 O → Fe x [(OH) y ] (3x-y)+ +yH +

[0070] Different hydrolysates recombined with Cl - , mainly the following reactions occurred:

[0071] Fe x [(OH) y ] (3x-...

Embodiment 1

[0076] Such as figure 2 shown. Use an acid-resistant corrosion pump 1 to reduce the copper content to 2.0-100.0g / L and the density to 1.05-1.35kg / m 3 PCB etching waste liquid 2.0m 3 Import the electrolytic cell 2, and add the electrolytic promoting liquid through the electrolytic promoting liquid device 3, turn on the power and directly electrolyze copper, when the concentration of copper ions in the acidic etching waste liquid is lower than 0.50g / L, cut off the power and end the electrolysis (the electrolysis time is 5.0~10.0h), after the electrolysis is finished, the electrolyzed copper powder is collected through the copper powder filter 4.

[0077] Lead the electrolytic copper filtrate into the copper replacement device 7, add reduced iron through the reduced iron device 6, turn on the impeller stirring device 5 for uniform mixing, and continuously monitor the copper content in the electrolytic filtrate until it drops to the lowest concentration or is completely replace...

Embodiment 2

[0082] Such as figure 2 shown. Use an acid-resistant corrosion pump 1 to reduce the copper content to 2.0-100.0g / L and the density to 1.05-1.35kg / m 3 PCB etching waste liquid 2.0m 3 Import the electrolytic cell 2, and add the electrolytic promoting liquid through the electrolytic promoting liquid device 3, turn on the power and directly electrolyze copper, when the concentration of copper ions in the acidic etching waste liquid is lower than 0.50g / L, cut off the power and end the electrolysis (the electrolysis time is 5.0~10.0h), after the electrolysis is finished, the electrolyzed copper powder is collected through the copper powder filter 4.

[0083] Lead the electrolytic copper filtrate into the copper replacement device 7, and add reduced iron through the reduced iron device 6, turn on the impeller stirring device 5 for uniform mixing, and continuously monitor the copper content in the electrolytic filtrate, when it drops to the lowest concentration or is completely rep...

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Abstract

The invention relates to a method for extracting copper of a PCB acid etching waste liquid and preparing polyferric chloride, which comprises the following steps: the PCB acid etching waste liquid is electrolyzed directly and copper powder precipitated by electrolysis is reclaimed; reduced iron is added into a mixed solution after the electrolysis and copper sponge precipitated by replacement reaction is reclaimed; claimed crude copper is purified and prepared into copper powder products; the mixed solution after replacement reaction is added with ferric oxide or a substance containing Fe irons; the mixed solution mingled with the Fe irons is added respectively with a polymeric antioxidant and a stabilizer and simultaneously, the pH value of which is regulated with acid or alkali; and finally, the PFC is prepared. The method of the invention completely realizes reclamation and recycling of wastes and water environment treatment and finally 'zero' emission and has good environmental protection, simple preparation process, high economic benefit and wide application scope.

Description

technical field [0001] The invention relates to a method for firstly extracting copper by using acidic etching waste liquid of printed circuit boards, and then preparing the remaining waste liquid into polyferric chloride, which belongs to resource utilization of industrial waste and water environment treatment. Background technique [0002] In recent years, with the steady growth of the world's electronics industry, my country's printed circuit board (PCB) manufacturing industry has also developed rapidly, and its output and output value have ranked among the top in the world. However, during the rapid development of the PCB manufacturing industry, a large amount of toxic and harmful industrial waste is produced, and the waste is directly discharged, causing serious harm to the ecological environment. Among the large amount of waste discharged by PCB enterprises, the acidic etching waste liquid contains a large amount of highly corrosive free acid and ion copper. If it is d...

Claims

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Application Information

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IPC IPC(8): C23F1/46C25C1/12C22B3/46C01G49/10C22B15/00
CPCY02P10/20
Inventor 廖兴盛周军朱波
Owner HUNAN VARY TECH
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