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Acid etchant online electrolytic recycling device and etchant regenerating method

An acid etching solution and electrolytic recovery technology, which is applied in the field of raw material recovery and recycling, can solve the problems of lack of measures and methods to prevent chlorine evolution from anodes, increased difficulty in recovering copper, and increased difficulty in operation, and achieves an area of Small, easy to popularize and apply, low production cost

Inactive Publication Date: 2011-10-05
GUANGZHOU HONWAY TECH CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN 101532136A discloses an electrolytic regeneration method based on the absence of chlorine gas, using acidic etching waste liquid with 0.05-0.5 mol / L inhibitor as anolyte, and etching with diluted copper mass concentration of 15-40 g / L The waste liquid is the catholyte, and copper powder is precipitated at the cathode through electrolysis. After the electrolysis, the anode and cathode liquids are mixed in a certain proportion to become a regeneration etching solution. However, this invention patent does not set a diaphragm between the cathode and the anode, and the cathode Copper powder is precipitated, and copper needs to be recovered by filtering the catholyte, which makes the operation more difficult
However, this method uses a cationic membrane to make it difficult to separate copper from the cathode, and copper powder is deposited from the cathode during the electrolysis process, requiring a special solid-liquid separation device, which increases the difficulty of copper recovery, and the etching waste before entering the electrolytic cell must be filtered out. Miscellaneous process
In addition, this invention patent does not have measures and methods to prevent anodic chlorine evolution

Method used

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  • Acid etchant online electrolytic recycling device and etchant regenerating method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Preparation containing total copper is 175g / L (Cu + 2g / L), chlorine 270g / L, hydrogen 2.0g / L acid etching solution, used for etching machine work, such as figure 1 as shown,

[0039] (1) Before the etching begins, the acidic etching solution is imported into the electrolytic cell 6 and the adjustment tank 5, and the acidic etching solution is imported into the etching machine through the adjustment tank 5;

[0040] (2) When etching is carried out, the acid etching solution passes through the etching machine to produce etching waste liquid, and the etching waste liquid is introduced into the anolyte storage tank 4 and the catholyte storage tank 3, and the catholyte is electrolyzed in the cathode chamber 1 of the electrolytic cell to obtain the catholyte and adhere to the cathode tube The metal copper in the anode chamber 2 is electrolyzed to obtain the anolyte, and the electrolyte in the cathode chamber 1 and the anode chamber 2 of the electrolytic cell is supplemented b...

Embodiment 2

[0045] Preparation containing total copper 155g / L (Cu + 2g / L), chlorine 260g / L, hydrogen 1.9g / L acid etchant for etching machine work, such as figure 1 as shown,

[0046] (1) Before the etching begins, the acidic etching solution is imported into the electrolytic cell 6 and the adjustment tank 5, and the acidic etching solution is imported into the etching machine through the adjustment tank 5;

[0047] (2) When etching is carried out, the acid etching solution passes through the etching machine to produce etching waste liquid, and the etching waste liquid is introduced into the anolyte storage tank 4 and the catholyte storage tank 3, and the catholyte is electrolyzed in the cathode chamber 1 of the electrolytic cell to obtain the catholyte and adhere to the cathode tube The metal copper in the anode chamber 2 is electrolyzed to obtain the anolyte, and the electrolyte in the cathode chamber 1 and the anode chamber 2 of the electrolytic cell is supplemented by the catholyte st...

Embodiment 3

[0052] Preparation containing total copper 130g / L (Cu + 2g / L), chlorine 250g / L, hydrogen 1.8g / L acid etchant for etching machine work, such as figure 1 as shown,

[0053] (1) Before the etching begins, the acidic etching solution is imported into the electrolytic cell 6 and the adjustment tank 5, and the acidic etching solution is imported into the etching machine through the adjustment tank 5;

[0054] (2) When etching is carried out, the acid etching solution passes through the etching machine to produce etching waste liquid, and the etching waste liquid is introduced into the anolyte storage tank 4 and the catholyte storage tank 3, and the catholyte is electrolyzed in the cathode chamber 1 of the electrolytic cell to obtain the catholyte and adhere to the cathode tube The metal copper in the anode chamber 2 is electrolyzed to obtain the anolyte, and the electrolyte in the cathode chamber 1 and the anode chamber 2 of the electrolytic cell is supplemented by the catholyte st...

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Abstract

The invention discloses an acid etchant online electrolytic recycling device and an acid etchant online electrolytic regenerating method. The method comprises the following steps of: introducing acid etchant into an electrolytic tank and an adjusting tank; introducing the acid etchant into an etching machine through the adjusting tank; introducing waste etchant into catholyte and anolyte storage tanks; electrolyzing in a cathode chamber of the electrolytic tank to obtain catholyte and metal copper which is attached to a cathode pipe; electrolyzing in an anode chamber to obtain anolyte; supplementing electrolyte in the cathode and the anode chambers of the electrolytic tank respectively through catholyte and anolyte storage tanks; and after exhausting the acid etchant in the adjusting tank, mixing catholyte and anolyte obtained through the electrolysis in the electrolytic tank, leading the mixed catholyte and anolyte to enter the adjusting tank for being continuously used for the work of an etching machine, taking out the cathode pipe and stripping electrolytic copper. According to the invention, acid etchant online electrolytic recycling device can achieve a butt-joint online working state with the etching machine to form closed loop circulation, so that the etchant cost is greatly reduced and the metal copper can be recycled, wherein the regenerated electrical efficiency of copper ions is larger than or equal to 98 percent, the efficiency in recycling copper through cathodic deposition is larger than or equal to 95 percent and the copper purity is higher than 99 percent.

Description

technical field [0001] The invention relates to the field of recovery and recycling of raw materials, in particular to an on-line electrolytic recovery copper device of an acid etching solution for a printed circuit board and a method for regenerating the etching solution. Background technique [0002] Since 2009, China has become the world's largest PCB production country. At present, the etching solutions widely used in the etching process for producing PCBs are mainly alkaline etching solutions and acidic etching solutions. With the increase of multi-layer plate production and the number of multi-layer plates, the consumption of acidic etching solution has increased year by year, and the consumption of acidic etching solution has exceeded that of alkaline etching solution. There are many kinds of acidic copper chloride etching solution, mainly HCl / CuCl 2 、HCl / NaCl / CuCl 2 , HCl / NH 4 Cl / CuCl 2 Wait. In the production process of printed circuit boards, circuit boards m...

Claims

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Application Information

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IPC IPC(8): C25C1/12C25C7/00C23F1/46
CPCY02P10/20
Inventor 赵国鹏钟洪胜徐海清陈力格袁国伟曾振欧胡耀红
Owner GUANGZHOU HONWAY TECH CORP
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