Treatment method for high-precision rolled copper foil oxide treatment on produced wastewater

Abstract

The invention provides a treatment method for high-precision rolled copper foil oxide treatment on produced wastewater. The treatment method comprises the following steps: firstly, putting sodium hydroxide into wastewater to be treated so as to adjust a pH value, adding ferrous sulfate, sufficiently stirring, adding a coagulant and a flocculant, precipitating for another time, filtering so as to obtain filtrate residues and filtrate, putting hydrochloric acid into the filtrate, adjusting the pH value, and discharging the filtrate after contents of copper ions and nickel ions in the filtrate meet standards; dissolving the ferrous sulfate, and respectively reducing bivalent copper ions and bivalent nickel ions in amino copper and amino nickel into cuprous ions and univalent nickel ions by using generated Fe<2+>. As the cuprous ions and the univalent nickel ions can be easily reacted with hydroxide ions in water to generate cuprous hydroxide and nickel hydroxide precipitate, then heavy metals of metallic copper and nickel in wastewater are economically and efficiently removed in an up to standard manner, and good popularization and application values can be made.

Description

technical field [0001] The invention relates to the technical field of rolling copper foil processing, in particular to a method for treating waste water produced by high-precision rolling copper foil blackening treatment. Background technique [0002] High-precision rolled copper foil has excellent thermal conductivity, mechanical properties and electrical properties. It is the core basic material for the development of the electronic information industry and the key material for the production of new energy and new energy vehicles. It is used in flexible printed circuit boards (FPC), new Energy batteries, flexible busbars, radio wave shielding plates, high-frequency busbars, heat collectors, packaging and engineering decoration, etc. are increasingly widely used. [0003] The surface blackening treatment of copper foil is a key technology to improve the bonding strength between copper foil and substrate and prevent copper powder from falling off on the surface of copper fo...

AI Technical Summary

Problems solved by technology

The addition of ammonia salt directly leads to a substantial increase in the concentration of copper, nickel, ammonia nitrogen and other pollutants in wastewater treatment

[0005] The presence of ammonium ions in process wastewater seriously affects the treatment of copper ions and nickel ions in sewage. The reason is that ammonia ions can form stable tetraammine copper and tetraammine nickel complexes with copper ions and nickel ions. The solubility product constant Ksp of the compound is much higher than the solubility product constant of copper hydroxide, and the use of conventional chemical precipitation methods cannot achieve wastewater treatment and discharge standards

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