Complex copper waste liquid and micro-etching waste liquid composite treatment method

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a complex copper waste liquid and micro-etching waste liquid composite treatment method. The complex copper wasteliquid and micro-etching waste liquid composite treatment method comprises the following steps: firstly, carrying out oxidation complex breaking to remove organic matters, then carrying out solid-phase extraction to recover copper ions for preparing basic copper chloride, finally, adding a powdery active substance into extracted effluent, carrying out electrolytic reaction under an aeration condition, and then adding a precipitator to generate a wrappage. By means of the mode, combined treatment of the complexing copper waste liquid and the micro-etching waste liquid is achieved, copper ionsin the waste liquid are recycled, COD, P, NH3N, Cu, Ni and other indexes in reaction effluent obtained after wrappage is filtered meet the IV-class standard of surface water to be discharged. The treatment method is easy to control in reaction condition and good in treatment effect.

Description

【Technical field】 [0001] The invention relates to the technical field of waste water treatment, in particular to a composite treatment method of complexed copper waste liquid and micro-etching waste liquid. 【Background technique】 [0002] Expansion, degreasing, micro-etching, electroless copper plating, electroless copper deposition, etc. are all indispensable processes in the circuit board manufacturing process of the electronic information industry. The process produces a large amount of complexed copper waste liquid and non-complexed copper sulfate waste such as micro-etching. The liquid belongs to the HW17 and HW22 categories in the "National Hazardous Waste List". [0003] The complex copper waste liquid represented by electroless copper plating has the characteristics of alkalinity (pH>11), low copper concentration (20-4000mg / L), high concentration of organic matter (15000-50000mg / L), etc., which contains EDTA, Various organic additives such as potassium tartrate a...

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Problems solved by technology

[0008] CN 107892322 A proposes the method of "ion exchange adsorption - pickling resin to obtain copper regeneration solution - evaporation and concentration of copper regeneration solution - cooling and crystallization to recover copper sulfate" to treat copper-containing wastewater , due to the high acidity and oxidant content of the micro-etch waste liquid, it cannot be directly subjected to ion exchange resin adsorption treatment, and the patent does not disclose how to ensure the purity of the copper regeneration liquid

CN109112312 A proposes to adopt the method of "sodium sulfite reducing oxidant-organic extraction-electrolytic back-extraction solution" to reclaim cathode metal copper from copper micro-etching solution. As mentioned above, the electrolytic method can not discharge the effluent copper up to standard, and the method lacks the removal of organic matter step, the organic matter will affect the extraction effect and the extracted water still cannot meet the discharge standard

CN 103803744 B uses "iron powder reduction to obtain elemental copper-heavy metal scavenger to precipitate residual copper ions-adding oxidation to prepare polyferric sulfate" to treat copper-containing micro-etching waste liquid. This method needs to consume a large amount of acid and oxidant, and the cost is high. Recycling The sponge quality is poor due to excessive iron powder

[0009]In summary, the existing research on complexed copper waste liquid and micro-etching waste liquid has a single direction of copper recycling, and the added value of recycled copper products is not high or the conditions It is difficult to control, the effluent cannot reach the standard, lack of advanced treatment technology, etc., the technical system is not perfect, and it still cannot meet the needs of actual projects

In order to reduce production costs, improve processing efficiency, and improve copper recovery rate and product purity, the present invention has developed a new method for composite treatment of complexed copper waste liquid and micro-etching waste liquid to recover basic copper chloride and realize the discharge of waste water up to standard At present, there are no reports and cases of any combined treatment process of the two waste liquids, and there is no report on the recovery of basic copper chloride from the two waste liquids.

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