Method for recycling circuit board etching waste liquid

Abstract

The invention relates to a recycling method of circuit board etching waste liquid. The method comprises the following steps that S1, an extraction agent is added into the etching waste liquid, and after layering, a water phase and a loaded-copper oil phase are obtained; secondly, electroplating waste liquid is added into the loaded-copper oil phase for reverse extraction, and after layering, a solution containing copper and an oil phase are obtained; thirdly, the copper-contained solution is pretreated, and copper plating liquid is obtained; and fourthly, the copper plating liquid is used forelectroplating a circuit board to be plated. Through the method, the etching waste liquid is not treated in a low-value manner, the copper in the etching waste liquid is sufficiently used, through a series of treatment, the plating copper liquid is obtained, when the copper plating liquid carries out electroplating on the circuit board to be plated, an infusibility anode is adopted for completelyor partly replacing a phosphor copper anode, the use amount of phosphor copper can be greatly reduced, the electroplating-level copper sulfate does not need to be added, energy is saved, pollutions are reduced, and benefits are brought to an enterprise.

Description

Technical field [0001] The invention relates to the preparation field of circuit boards, in particular to a method for recycling and reusing circuit board etching waste liquid. Background technique [0002] The PCB printed circuit board is an important electronic component, a support for electronic components, and a carrier for electrical connection of electronic components. Its production process includes: cutting, drilling, pattern transfer, electroplating, film removal, etching and other processes. Among them, etching is a process that consumes a lot of chemical water in PCB production, and it is also the process that produces the largest amount of waste liquid and wastewater. The State Environmental Protection Administration has positioned the etching waste in the PCB printed circuit board manufacturing process as hazardous waste (hazardous waste number: HW22), which must not be discharged at will and must be treated. [0003] The existing etching waste liquid treatment metho...

AI Technical Summary

Problems solved by technology

However, the outsourced disposal of etching waste liquid has the risk of secondary pollution in transportation and disposal, and the income is poor; the electrolytic copper recovery project consumes high processing power and high equipment costs, and the metal copper obtained can only be disposed of as scrap copper based on the content. , the income is not ideal, and the process of processing waste copper into phosphor copper and then returning to the electroplating line for copper plating needs to consume a lot of social resources

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