Technology for regenerating and cycling circuit board microetching waste liquid

Abstract

The invention relates to a technology for regenerating and cycling circuit board microetching waste liquid, which comprises procedures as follows: peroxide microetching waste liquid generated in the microetching chemical reaction process of processing an online produced workpiece to be processed of a circuit board into a processed workpiece in a microetching bath is taken as the raw material, peroxide, chloridion and silver ions are removed from the raw material, the raw materials recovers pure copper and complements lost components to become a regenerated microetching liquid, and the qualified microetching liquid automatically returns to the circuit board online producing microetching bath for regeneration and cycling. The invention adopts the technical scheme that peroxide microetching waste liquid discharged from online production is used as the raw material, peroxide, chloridion and silver ions are removed from the raw material, the raw material recovers pure copper and complements lost components to become a regenerated qualified microetching liquid, and the qualified microetching liquid automatically returns to the microetching bath and overcomes the defects that the microetching liquid in the circuit board microetching technology adopted by the prior PCB enterprises is discharged just after being treated simply, a great amount of waste is caused during the processing, and resources are lost severely, thereby being suitable for regenerating and cycling of various circuit board microetching waste liquid of circuit board online production enterprises.

Description

technical field [0001] The invention relates to a circuit board micro-etching waste liquid recycling process. Background technique [0002] Existing PCB companies, that is, micro-etching waste liquid in the circuit board micro-etching process of circuit board companies, the concentration of copper ions is low, and the waste liquid is not recycled, but the common treatment is after the concentration of copper ions reaches 40g / l , discharged into the wastewater treatment system, and the copper compound is recovered by the neutralization precipitation method, and the wastewater is discharged or reused after sedimentation and filtration. This treatment process is very wasteful and does not conform to the resource-saving circular economy industrial policy. There is an urgent need to have a technical solution for the recovery and recycling of micro-etching waste liquid, so that the copper in micro-etch waste liquid can be recovered, and the waste liquid can be converted into quali...

AI Technical Summary

Problems solved by technology

[0002] Existing PCB companies, that is, micro-etching waste liquid in the circuit board micro-etching process of circuit board companies, the concentration of copper ions is low, and the waste liquid is not recycled, but the common treatment is after the concentration of copper ions reaches 40g / l , discharged into the wastewater treatment system, and the copper compound is recovered by the neutralization precipitation method, and the wastewater is discharged or reused after sedimentation and filtration. This treatment process is very wasteful and does not conform to the resource-saving circular economy industrial policy. There is an urgent need to have a technical solution for the recovery and recycling of micro-etching waste liquid, so that the copper in micro-etch waste liquid can be recovered, and the waste liquid can be converted into qualified micro-etching liquid for regeneration and recycling

[0003] If we want to solve the technical measures for the recovery and recycling of micro-etching waste liquid, the concentration of copper ions in the solution must be controlled between 2 and 10g / l, and the concentration of hydrogen peroxide must be controlled between 12 and 18g / l. , the concentration of sulfuric acid is between 120-160g / l, and the concentration of chloride ions must be controlled at 6ppm, that is, less than six parts per million; if the concentration of each ion is too high or too low, the microetching effect of the microetching solution cannot be achieved Process requirements, so that the quality of the workpiece is unqualified or the production capacity is low. The highly toxic and hazardous micro-etching waste liquid discharged by it will pollute the environment and increase operating costs.

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