Method of preparing high pure cathode copper by using PCB acid chlorine copper etching solution sewage

Abstract

The present invention disclose a method of preparing high pure cathode copper by using PCB acid chlorine copper etching solution sewage, the main technical characteristics include applying sewage preprocess procedure to satisfy extraction need better, programming multi-extraction to improve extraction recovery rate of cooper, applying extractant with high selectivity avoid extraction entrainment design, washing procedure etc. to reduce carried impurity and dispel affect of chloride ion to electrodeposition. The electrodeposition applies additive to improve copper crystallinity, simultaneity, utilize residual useful ingredient in raffinate to prepare copper etching solution, arriving the objective of both prepare high pure cathode copper effectively and regenerative cycle use of the etching solution. The purity of the prepared cathode copper reaches 99.99%.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to a method for recovering copper from PCB acidic chlorine-type copper etching solution wastewater and preparing high-purity cathode copper. The method can be applied to printed circuit boards (PCBs) using acidic chlorine-type copper etching solution ) enterprises or related professional wastewater treatment enterprises. Background technique [0002] The etching process of etching away the copper in the non-graphic part with copper etching solution is one of the basic processes of printed circuit board (PCB) enterprises. Common types of copper etching solutions are ammoniacal (alkaline) chlorine-type etching solutions and acidic chlorine-type copper etching solutions. If the waste etching solution cannot be recycled well, it will lead to a large loss of copper resources and serious pollution of the environment. Traditional methods include using waste liquid to dire...

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Problems solved by technology

This leads to the storage and operation of highly toxic and dangerous chlorine gas, causing great trouble to the factory;

[0008] (3) There is inevitably a certain amount of ferric ions in the acidic etching solution, which leads to a decrease in the electrical efficiency during electrowinning;

[0009] (4) Although insoluble anodes are used, the chloride ion corrosion is serious and the plates are easy to burn; the electrode plates have a large investment and high cost;

[0010] (5) The composition of the etching solution is complex, the cathode copper quality is poor, and the operation stability is poor

[0014] (2) Wastewater from various processes in PCB manufacturing is inevitably mixed with each other. The actual source of etching waste liquid is complicated, and contains a small amount of organic components such as ink, which affects extraction and impurity entrainment;

[0015] (3) Due to the high concentration of copper ions in the etching waste liquid, the recovery rate of copper extraction is only about 80%;

[0016] (4) The quality of the prepared cathode copper is generally between 97% and 99%, which does not meet the national standard for cathode copper

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