Recovery method for mother liquor after copper chloride hydroxide production by etching waste liquor

Abstract

The invention discloses a recovery method for mother liquor after copper chloride hydroxide production by etching waste liquor, which is characterized in that the mother liquor of the etching waste liquor after the copper chloride hydroxide production is firstly neutralized, precipitated and filtered, the rest liquor sequentially passes through an ion exchanger filled with ion exchange resin and ion exchange resin fibers, then, the exchange liquor is evaporated, evaporation mother liquor and condensed water are obtained, ammonium chloride is obtained after evaporation mother liquor cooling, and ammonia nitrogen contained in the condensed water is removed through an efficient ammonia nitrogen regeneration reactor. In the second exchange liquor treated by the recovery method, the copper content is less than 5mug / L, and the content of the ammonia nitrogen passing through the efficient ammonia nitrogen regeneration reactor is less than 10mg / L. The etching waste liquor treated by the method has the advantages that copper ions are recovered in the form of copper chloride hydroxide, the ammonia is recovered in the forms of ammonia chloride and ammonia water, the waste water can also reach the industrial application standard to be cyclically utilized, and the goal of zero waste emission is realized.

Description

technical field [0001] The invention relates to a method for treating and recovering waste liquid, in particular to a method for recovering mother liquid after the production of basic copper chloride from etching waste liquid. Background technique [0002] Etching waste liquid is produced during the process of dissolving copper by chemical corrosion in the etching process of printed circuit boards. According to its acidity and alkalinity, it can be further divided into two types: acidic and alkaline. If this kind of waste liquid is not properly treated and utilized, it will cause serious environmental pollution and great economic waste. The usual treatment method in China is to extract the copper in the acid-base etching waste liquid to produce products such as basic copper chloride, copper sulfate, copper oxide or organic copper. In order to produce high-purity copper products, the acid-base etching waste liquid is generally refined first to remove impurities such as arsen...

AI Technical Summary

Problems solved by technology

In addition, the biochemical treatment cost of the condensed water produced by the mechanical compression reevaporation system is 6~8 yuan / ton, and the treated wastewater is directly discharged into the sewage treatment plant, which makes the water resources not fully utilized and is directly discharged. The sludge produced by the biochemical method Also need to deal with

[0004] The existing etching waste recovery and treatment technology still fails to achieve zero discharge. Therefore, it is necessary to further improve the etching waste recovery and treatment technology