Method for recovering 99.98% copper powder from etching liquid and preparing 99.999% cathode copper

Abstract

The invention discloses a method for recovering 99.98% copper powder from etching liquid and further processing the copper power to prepare 99.999% cathode copper. According to the method, firstly, the etching liquid is subjected to dialysis in an electrodialysis cell containing a copper sulphate solution, and copper ions in the etching liquid enter the copper sulphate solution, so that a high-concentration copper sulphate solution is obtained; then the high-concentration copper sulphate solution is introduced into an electrolytic cell for electrolysis, so that the high-purity copper powder isobtained; then the high-purity copper powder is pressed into a brick, the copper brick is placed in a conductive frame made from a titanium material, and is used as an anode, a pure titanium board isadopted as a cathode, and refining is conducted in the electrolytic cell so that the cathode copper with purity of 99.999% can be obtained at the cathode of the electrolytic cell. The method belongsto the field of ageing etching liquid for copper extraction, regeneration and reuse, and compared with a traditional technology, the method has the characters that added values of products are high, both the copper powder and the cathode copper can be used as products, moreover, a process is short, equipment is little, and energy consumption is low; moreover, in the whole process, no other agentsare introduced, no intermittent products are polluting, and the requirements of environmental-protection can be met.

Description

technical field [0001] The present invention relates to the field of recovery and treatment of etching solution, in particular to a method for recovering and preparing refined copper from etching solution. technical background [0002] At present, after the PCB board is etched for a period of time, the etching solution will gradually age and the etching ability will decrease. These etching solutions include alkaline etching solution, acidic etching solution and micro-etching waste solution. In order to recover a large amount of copper elements contained in these waste etching solutions and restore the etching performance, the existing technology adopts the following method: the alkaline etching solution is sequentially extracted, washed with water, and then electro-deposited copper after stripping. The copper content is between 98% and 99%. %; For acidic etching solution and micro-etching waste solution, directly electrolyze it into copper powder or copper plate, and the cop...

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Problems solved by technology

[0005] However, the process of pyrometallurgy is long, with many equipment, large investment and high energy consumption, resulting in small processing profits

After acid leaching and electrolysis, the electrolyte needs to be opened after a period of use, which will bring new water pollution. In addition, new pollutants will be generated in the purification process, such as slag from impurity removal and organic waste, which are difficult to deal with.

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