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Technique for producing soluble copper oxide from acidic etching waste liquor

A technology of acidic etching waste liquid and copper oxide, which is applied in the direction of copper oxide/copper hydroxide, photographic process, photographic auxiliary process, etc., can solve the problems of copper oxide activity verification, increase production cost, and a large amount of washing wastewater, so as to eliminate risks , little pollution and low impurity content

Active Publication Date: 2012-10-17
昆山市千灯三废净化有限公司
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AI Technical Summary

Problems solved by technology

Method (1) In the process of making copper oxide, the solution will appear viscous and needs to go through multiple washing processes, so a large amount of washing wastewater will be generated; method (2) needs to use ethanol as a solvent, which increases the production cost and prepares oxidation Nitrogen dioxide or nitric oxide waste gas will be produced in the process of copper, which will cause certain pollution to the environment; although zero discharge of waste water has been achieved in method (3), the acidic copper chloride etching waste liquid has not undergone any impurity removal process , under the condition of pH 8.0, various metal impurities are easily precipitated and enriched; methods (4), (5), (7)-(9) have the same disadvantages as method (3), and none of them involve How to remove metal impurities; method (10) prepared monoclinic copper oxide, but its activity was not verified; method (11) although the washing process was used to reduce the sodium, iron, nickel in copper oxide to a certain extent The content of metal impurities and Cl ions, but still contains a lot of sodium ions (hundreds to thousands of ppm) and chloride ions (content greater than 45ppm), and the activity of copper oxide has not been verified
Method (12) is obtained by distilling ammonia for a long time under high temperature and strong alkali state with alkaline etching waste liquid, so the activity of copper oxide is also low

Method used

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  • Technique for producing soluble copper oxide from acidic etching waste liquor
  • Technique for producing soluble copper oxide from acidic etching waste liquor
  • Technique for producing soluble copper oxide from acidic etching waste liquor

Examples

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example 1

[0050] The process for producing soluble copper oxide from acidic etching waste liquid comprises the following steps: (1) collecting the acidic etching waste liquid online, and using the collected acidic etching waste liquid to remove the Fine insoluble particles, etc.;

[0051] (2) Pass the filtered acidic etching waste liquid into the membrane electrolyzer for ionic membrane electrolysis, and place a copper cation exchange membrane in the middle of the membrane electrolyzer;

[0052] The oxidation reaction of cuprous chloride complex ions in the anode area of ​​the membrane electrolyzer generates copper chloride complex ions to realize the regeneration of acidic etching waste liquid:

[0053] 2(CuCl 3 ) 2- +Cl - →2(CuCl 4 ) 2- +2e

[0054] The reduction reaction of copper chloride ions in the cathode area produces copper;

[0055] 2(CuCl 4 ) 2- +Cu+2Cl - →2(CuCl 3 ) 2-

[0056] 2(CuCl 3 ) 2- →2(CuCl 2 ) - +2Cl -

[0057] 2(CuCl 2 ) 2- +2e→2Cu↓+4Cl

[00...

example 2- Embodiment 9

[0068] The same process as in Example 1 was used to prepare soluble copper oxide, and a test experiment was carried out. The difference is that different micron filter pore sizes listed in Table 1, NH 3 Ratio to the amount of Cu substance, soaking temperature of ammonia water, vacuum degree of ammonia distillation, temperature of ammonia distillation, time of ammonia distillation, drying temperature, calcining temperature, mesh number of sieve. The test results of the prepared copper oxide are also shown in Table 1.

[0069] Table 1

[0070]

[0071]

[0072] As can be seen from the test results shown in Table 1, the copper oxide produced by the process of the present invention has low impurity content and high activity, and can be completely dissolved in the electroplating solution within 20 seconds.

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Abstract

The invention discloses a technique for producing soluble copper oxide from acidic etching waste liquor, which comprises the following steps: electrolyzing acidic etching waste liquor to generate copper; dissolving electrolyzed cathode copper in an ammonia water-CO2 system to form a copper-ammonia solution; carrying out negative pressure ammonia evaporation on the copper-ammonia solution to form basic copper carbonate; and calcining the generated basic copper carbonate to generate copper oxide. The technique disclosed by the invention has the advantages of low production cost, simple technique and low environmental pollution in the production process; and the produced copper oxide has the advantages of low impurity content and high activity and is soluble in a plating solution.

Description

technical field [0001] The invention relates to a production process of electroplating-grade active copper oxide, in particular to a production process of directly preparing electroplating-grade active copper oxide by utilizing circuit board acidic etching waste liquid. Background technique [0002] Copper oxide powder is an important multifunctional inorganic fine material, mainly used as raw material for colorants and magnetic materials of glass, enamel, ceramics, etc., for the manufacture of pyrotechnics, dyes, catalysts and other copper salts, etc., and also for artificial It can also be used in the silk industry, as an anti-wrinkle agent in paint and in the electronics industry, etc. Plating grade activated copper oxide is mainly used in the printed circuit board electroplating industry. In recent years, with the rapid development of the electronics industry, the production of circuit boards has continued to increase. In particular, my country has surpassed Japan in 20...

Claims

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Application Information

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IPC IPC(8): C01G3/02C23F1/46C25C1/12
CPCY02P10/20
Inventor 庄永薛克艳邹鸿图金梁云姚明辉
Owner 昆山市千灯三废净化有限公司
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