Fully closed system for regenerating alkaline etching liquid and recovering copper in PCB

A recovery system and alkali etching technology, applied in the field of regeneration system, can solve the problems of reducing the etching line speed and quality, the etching solution must be completely replaced, and the impact of etching solution regeneration and reuse, so as to save costs, speed and operating costs saving effect

Inactive Publication Date: 2010-03-24
涂方祥
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  • Application Information

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Problems solved by technology

However, this technology will seriously reduce the speed and quality of the etching line, which is difficult for most manufacturers to accept; 3. Extraction and electrolysis to obtain copper
This method still has the following defects (1) the concentration of copper in the etching solution after extraction is difficult to be accurately controlled at 80-90g/l, which has an impact on the regeneration and reuse of the etching solution; (2) it is difficult to avoid a part of the extraction agent from entering the etching solution , affecting the ef

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  • Fully closed system for regenerating alkaline etching liquid and recovering copper in PCB
  • Fully closed system for regenerating alkaline etching liquid and recovering copper in PCB

Examples

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[0022] In one case, the amount of etching waste liquid from the alkaline etching production line was 3M 3 / Day, which is 90M 3 / Month, Cu 2+ The concentration is 140-150g / L, stored in a waste liquid tank, the waste liquid is pumped into the extraction tank through a pump, the pumping volume is 125L / h, the pumping volume of the extractant is 125L / h, the extraction tank is effective The volume is 125L. It adopts mechanical stirring and continuous operation, and the extraction time is 1h. The overflowing mixture is separated in a gravity tank. The volume of the gravity separation tank is 250L. It is made of plexiglass, and a microporous aeration head is installed in the separation tank. The extractant with a smaller specific gravity enters the back extraction mixing tank from above. The larger etching solution enters the fiber degreaser, and the copper ion concentration in the separated etching solution is 70 g / L.

[0023] The separated etching solution is introduced into the origin...

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Abstract

The invention relates to a technology for regenerating alkaline etching waste liquid and recovering copper in a PCB. Along with the etching process, the concentration of copper ions in the etching liquid is increased until the etching liquid can not be used and becomes waste liquid. The technology adopts the following four fully closed cycles which are mutually nested: an etching liquid cycle, anextracting agent cycle, a stripping agent cycle and an ammonia gas cycle; and four main materials interact but are recycled continuously. The technical method comprises the following steps: using an extracting agent to extract partial copper from the etching waste liquid; after gravity separation, air flotation separation and fiber degreasing, controlling and adjusting the concentration of copperions to achieve the level of fresh etching liquid through the specific gravity; using a water injector to add liquid ammonia, and using pH to automatically control and adjust the ammonia concentration; and after adjusting other components, recycling for production. The extracting agent containing copper is processed by back extraction by using sulfuric acid, the extracting agent returns to the extracting section for being reused after separation, and the copper sulfate is electrolyzed into copper to be sold. The whole line recycles various resources to achieve the purposes of waste utilizationand resource recovery, and no wastes are discharged.

Description

Technical field [0001] The invention relates to a regeneration system applied to alkaline etching waste liquid in printed circuit boards, which can safely regenerate the etching waste liquid and apply it to a production line and recycle excess metal copper to achieve maximum utilization of resources and zero discharge. It is an environmentally friendly technology. Background technique [0002] Alkaline etching is an important step in the production of printed circuit boards. As the etching progresses, the concentration of copper ions in the etching solution becomes higher and higher, and the etching speed becomes slower and slower. If it is not replaced, the etching progress and quality will be seriously affected. Alkaline etching waste liquid not only contains a large amount of copper ions, but also contains other valuable chemical substances. Therefore, manufacturers will basically dispose of it by themselves or entrust qualified merchants to recycle it. [0003] At pre...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/24C02F1/461
Inventor 涂方祥
Owner 涂方祥
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