Microwave circulating disposal process for printed plate board etching waste liquor

Abstract

This invention discloses a process for treating the etching waste solution of printed circuit board by microwave circulation. Wherein: neutralize the etching waste solution in the microwave waste water catalyzing treatment system, charge air to aeration, and then filtrate with pressure to separate other heavy metals and oil impurities; conduct the pressure filtration, stirring and cleaning for four times, add acid and alkaline to react until reaching the saturation extent which would generate precipitation; extract and clean the mother liquid which has deposited settling crystal for continuing circulation reaction; separate the cupric sulfate crystals from the waste liquid using centrifuge; and the remained waste liquid can be used to produce other chemical products after microwave circulation regeneration process. When applying the process of this invention to treat the etching waste solution of printed circuit board, the microwave catalyzing technology can accelerate the substitution rate and improve the copper ion extraction rate. Besides, it comprehensively utilizes the waste water to produce other chemical products without waste water discharge, which thoroughly solves the serious environmental pollution problem caused by waste water discharge.

Description

technical field [0001] The invention relates to a process for treating waste etching liquid of printed circuit boards, in particular to a process for treating waste liquid of printed circuit boards with microwave circulation. Background technique [0002] In the waste liquid produced in the etching production of printed circuit boards, the entrained sulfate radical SO 4 2+ , chloride ion CL - , a small amount of copper ions Cu 2+ and ammonium salt NH 4 + , the general copper content is between 100-150g / L, and the ammonia nitrogen content is above 40g / L. At present, the traditional method of dealing with this type of etching waste liquid is generally to use it to produce copper sulfate or copper chloride, but the final waste liquid still has a considerable amount of heavy metals and high ammonia nitrogen elements. The direct discharge of these waste liquids makes The deterioration of soil and water quality has caused serious pollution of the ecological environment. Co...

AI Technical Summary

Problems solved by technology

At present, the traditional method of dealing with this type of etching waste liquid is generally to use it to produce copper sulfate or copper chloride, but the final waste liquid still has a considerable amount of heavy metals and high ammonia nitrogen elements. The direct discharge of these waste liquids makes Deterioration of soil and water quality, resulting in serious pollution of the ecological environment

Images