Resource utilization system and method of circuit board etching acidic waste liquid

Abstract

The invention relates to a resource utilization system and a method of circuit board etching acidic waste liquid. The system comprises a pre-treatment unit, a membrane distillation condensation unit,a crystallization unit, and an oxidation unit; the membrane distillation condensation unit is arranged at the downstream of the pre-treatment unit; the low temperature crystallization unit is arrangedat the downstream of the membrane distillation condensation unit; and the oxidation unit is arranged at the downstream of the low temperature crystallization unit. According to the system and the method, multiple-effect membrane distillation is adopted as the condensation unit, membrane distillation and low temperature crystallization, and oxidation reaction are combined, so that crystallizationefficiency is increased effectively, crystal purity is increased, the amount of discharged mother liquor is reduced obviously, full utilization of waste heat and reaction heat is realized, system maintenance cost and operation cost are reduced effectively.

Description

technical field [0001] The invention relates to the field of waste water treatment and recycling, in particular to a recycling system and method for circuit board etching acid waste liquid. Background technique [0002] With the rapid development of the electronics industry, the traditional circuit board etching process will produce a large amount of ferric chloride acidic waste liquid, which contains a large amount of copper and manganese, nickel, zirconium and other impurity metal ions. At present, the general method for recovering ferric chloride etching solution is: adding iron powder, displacing copper for recovery, and then using chlorine gas to oxidize ferrous chloride into ferric chloride for reuse in the etching solution. However, with the repeated use of the above etching solution, the content of impurity metals gradually accumulates, and the purity of ferric chloride also decreases, which cannot meet the requirements of etching. The above-mentioned etching waste ...

AI Technical Summary

Problems solved by technology

However, with the repeated use of the above etching solution, the content of impurity metals gradually accumulates, and the purity of ferric chloride also decreases, which cannot meet the requirements of etching.

The above-mentioned etching waste liquid is treated with zero discharge of hazardous waste, and the equipment investment cost and operating cost are high, and there are corrosion problems, and the benefit is low

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