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Method for extracting copper by utilizing waste browning liquid

A technology of browning liquid and solution, which is used in the improvement of process efficiency, photography technology, instruments, etc.

Active Publication Date: 2013-08-07
深圳市祺鑫环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrocatalytic process involves the relationship between electric drive and concentration difference, which affects the entire reaction efficiency

Method used

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  • Method for extracting copper by utilizing waste browning liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] At room temperature, add 50mL of prepared 2wt% polyacrylamide solution to 500mL of waste browning solution (the copper ion concentration is 28.9g / L), stir for 10min and filter, add 1g of sodium chloride to the filtrate, After stirring evenly, perform electrolysis in an insoluble titanium-based electrolytic cell covered with an indium oxide anode and a copper cathode, control a constant voltage of 10V, and a current density of 497A / m 2, After electrolysis for 1.5h, 14.35g copper was recovered, the copper recovery rate was 97.8%, mainly powdered copper.

Embodiment 2

[0040] Add 50mL of prepared 2 wt % polyacrylamide solution to 500mL of waste browning solution (the copper ion concentration is 28.9g / L), stir for 10min and then filter, add 1g of sodium chloride to the filtrate, add 10mL Add 0.01g of gelatin, thiourea, and casein with a mass ratio of 5:1:2 to the boiling water of 5:1:2 and mix the solids until they are completely dissolved. Then add them to 500mL of waste water. After stirring evenly, the insoluble titanium base is covered with indium oxide. Electrolysis is carried out in the electrolytic cell of the anode and the copper cathode, the constant voltage of 10V is controlled, and the current density is 489A / m 2 After 1.5 hours of electrolysis, 13.87g of bulk copper was recovered, the copper recovery rate was 96%, and the copper was mainly attached to the red copper.

Embodiment 3

[0042] Add 50mL of prepared 1 wt% polyacrylamide solution to 500mL of waste browning solution (the copper ion concentration is 41.3g / L), stir for 10min and then filter, add 5g of potassium chloride to the filtrate, add 10mL Add 0.03g of gelatin, thiourea, and casein with a mass ratio of 5:1:2 to the boiling water of 5:1:2 and mix the solids until they are completely dissolved. Then they are all added to 500mL of waste water. After stirring evenly, the insoluble titanium base is covered with indium oxide. Electrolysis is carried out in the electrolytic cell of the anode and the copper cathode, the constant voltage of 6V is controlled, and the current density is 425A / m 2 After 2.5 hours of electrolysis, 19.36g of bulk copper was recovered, the recovery rate of copper was 93.8%, and the copper was mainly attached to the red copper.

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Abstract

The invention discloses a method for extracting copper by utilizing waste browning liquid. The method comprises the following steps of: adding flocculating agent to the waste browning liquid, so that large particles and organic substances with multiple potential adsorption points in the waste liquid are preliminarily settled; filtering the treated waste browning liquid to remove filter residues; adding chlorine salt to the filtrate; placing the solution to an electrolytic cell, coating indium oxide on the surface of a titanium mesh as an anode, carrying out electrolysis by using red copper as a cathode to recycle copper; or adding gelatin, thiourea and casein to the solution for electrolysis to recycle block copper. The method for extracting copper by utilizing waste browning liquid can be used for carrying out electrolysis by carrying out simple flocculating settling filter treatment or adding additive, is simple to operate, low in treatment cost and capable of recycling high-quality copper.

Description

technical field [0001] The invention relates to a method for extracting copper by utilizing waste browning solution. Background technique [0002] Browning technology is an indispensable process of PCB inner layer board. With the need for high-precision and high-density integrated circuits, the manufacturing technology of printed circuit boards tends to develop more sophisticated multi-layer circuit boards. Thereby increasing the consumption of browning liquid and the generation of browning waste liquid. [0003] The browning solution itself uses sulfuric acid and hydrogen peroxide to micro-etch the surface of the copper foil, and forms a film layer that increases the interlayer lamination performance and protects the copper surface with the participation of organic additives. During the process, copper ions dissolve Into the browning liquid system, when the copper ion is too large, the disproportionation reaction will occur when the monovalent copper ion is not protected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12
CPCY02P10/20
Inventor 林奕聪潘湛昌范红田新龙胡光辉肖楚民
Owner 深圳市祺鑫环保科技有限公司
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