Method for recycling and regenerating PCB (Printed Circuit Board) acidic and alkaline etching waste liquid

Abstract

The invention provides a method for recycling and regenerating PCB (Printed Circuit Board) acidic and alkaline etching waste liquid. The method comprises the following steps: feeding acidic and alkaline etching waste liquid and an alkaline extracting agent into a centrifugal extraction system under the driving of power in a ratio of 1:4, and mixing, agitating and separating, wherein copper ions of the separated etching liquid are reduced to be lower than 50g / L and thus the acidic and alkaline etching waste liquid is regenerated; blending the regenerated acidic and alkaline etching waste liquid and returning back to a production line for cyclic utilization; after separating, feeding the extracting agent into a centrifuging water washing groove; after washing with water, feeding the extracting agent into a centrifugal backwashing groove, mixing with 190g / L dilute sulfuric acid and stirring so that the extracted copper ions are converted into copper sulfate; conveying the copper sulfate into a centrifugal electrolysis system, and producing a pipe type electrolysis copper pipe under the effect of direct current, wherein the copper content of the copper pipe is 99.95%; and after backwashing, conveying the extracting agent into an extracting agent chamber for cyclic utilization. With the adoption of the method, the problems in the prior art that the extracting agent is easy to lose, sulfate ions easily enter regenerated liquid, an electrolytic bath is likely to generate short circuit in the operation process, the occupied area of equipment is large can be solved.

Description

Technical field: [0001] The invention relates to a recovery and treatment technology of acid-base etching waste liquid in a printed circuit board production enterprise, in particular to a method for recycling and regenerating PCB acid-base etching waste liquid resources. Background technique [0002] Printed circuit boards are the foundation of the electronic information industry. Semiconductors and modern high-tech products are inseparable from printed circuit boards. With the increasing awareness of global environmental protection, countries have put the prevention of adverse impacts on the human body and ecological balance caused by the electronic manufacturing industry in the production process on the important agenda. In our country, only by protecting the environment can we achieve sustainable economic development, and the economic and environmental benefits of enterprises can also develop simultaneously. Printed circuit boards will produce a large amount of copper-co...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned shortcomings existing in the prior art, the present invention provides a method for recovering and regenerating PCB acid-base etching waste liquid resources. This system can solve the problem of easy loss of extractant and a large amount of sulfate ions entering regeneration in the traditional technology during operation. The quality is abnormal in the liquid, and the electrolyzer is easy to short circuit during operation, the equipment occupies a large area, and the electrolyzer has high investment.

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