Three grade cyclic absorption treatment method and equipment in acid etching production lines

Abstract

The invention discloses a three grade cyclic absorption treatment method and equipment in acid etching production lines. The three grade cyclic absorption treatment method comprises following steps: 1, electrolysis and regenerated liquid circulation; 2, chlorine gas absorption circulation; 3, etching solution circulation; 4, tail gas absorption circulation; and 5, tail gas treatment. According tothe three grade cyclic absorption treatment method, three grade cyclic absorption is adopted in acid etching production lines, so that absorption validity, rationality, and controllability are ensured, processing and recycling effect of Cl2 is ideal, absorption operation can be controlled based on ORP value, operation is convenient and stable, etching temperature is ensured to be stable, energy consumption is reduced, etching effect is improved, tail gas treatment load of the whole system is reduced, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to the field of PCBs, in particular to a treatment method and equipment using three-stage cyclic absorption in an acid etching production line. Background technique [0002] In the construction of the national economy, PCB is the basic industry for the development of industrialization and informationization. With the continuous development of economic construction, the PCB industry has developed rapidly. Due to the by-products of various wastes in the PCB production process, they need to be treated, and the most difficult to handle and dispose of is the copper etching waste solution. [0003] At present, in technical research, the traditional electrolysis method is mostly used. Because this method has high copper recovery rate and high copper purity, but chlorine gas will be generated in the electrolysis, which needs to be treated before discharge to avoid environmental pollution. Additional oxidant is added to maintain the etch...

AI Technical Summary

Problems solved by technology

So far, some manufacturers have adopted the method of chlorine gas treatment and reuse outside the acid etching production line. However, their method not only needs to add some special processing equipment, which increases the construction cost, but also needs to take certain measures to maintain the temperature of the etching solution. , and the actual absorption efficiency cannot be adjusted according to the ORP value, and the best treatment effect and cost have not yet been achieved. It is still necessary to develop an efficient, suitable and controllable treatment method and technology to make it better to recycle chlorine and reduce costs

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