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Electro-catalysis method for disposing waste brown liquid

A browning liquid, electrocatalysis technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of low copper recovery rate, wasteful production cost, cationic polymer and surface activity In order to improve the recovery rate, reduce the cost, and improve the oxidative degradation ability

Active Publication Date: 2014-07-23
VICTORY GIANT TECH HUIZHOU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two methods realize the recovery of copper in the waste browning solution by treating the organic matter in the waste browning solution first, in the actual treatment process, the copper recovery rate is low, and the copper added to the waste browning solution Cationic polymers and surfactants cannot be recycled, wasting a lot of production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare the electrolytic cell: the anode of the electrolytic cell is a titanium base covered with ruthenium oxide, the cathode of the electrolytic cell is a copper sheet, and the distance between the two electrodes is set to be 10 cm.

[0043] At room temperature, add 0.02g of cerium sulfate to 500mL of waste browning solution (the copper ion concentration is 29.3g / L), stir for 5 minutes to make it uniform, and then pass it into the upper electrolytic cell. Under a constant voltage of 8V, the current density 453A / m 2 , continuous electrolysis for 5 hours, when the solution turns light red, the concentration of copper ions in the measured waste liquid is less than 1g / L at this time, and the electrolysis is stopped. Add 10mL of P204 extractant to the electrolytic residual solution for extraction, then back-extract with 10mL of sulfuric acid solution with a concentration of 2mol / L, and the water phase after back-extraction is for use.

[0044] In this embodiment, a total ...

Embodiment 2

[0046] Prepare the electrolytic cell: the anode of the electrolytic cell is a titanium base covered with ruthenium oxide, the cathode of the electrolytic cell is a copper sheet, and the distance between the two electrodes is set to be 10 cm.

[0047] At room temperature, add 0.02g of cerium sulfate to 500mL of waste browning solution (the copper ion concentration is 41.7g / L), stir for 5 minutes to make it uniform, and then pass it into the upper electrolytic cell. Under a constant voltage of 8V, the current density 453A / m 2 , continue electrolysis for 5 hours, when the solution turns light red, the copper ion concentration in the waste liquid is measured to be less than 1g / L at this time, and the electrolysis is stopped. Obtain 14.35g copper, and the recovery rate of copper ion is 97.8%.

[0048] Add 10mL of P204 extractant to the electrolytic residual solution for extraction, then back-extract with 10mL of sulfuric acid solution with a concentration of 2mol / L, and the water ...

Embodiment 3

[0050] Prepare the electrolytic cell: the anode of the electrolytic cell is a titanium base covered with ruthenium oxide, the cathode of the electrolytic cell is a copper sheet, and the distance between the two electrodes is set to be 10 cm.

[0051] At room temperature, add 0.05gMn 2 (SO 4 ) 3 , after stirring for 5 minutes to make it even, pass it into the upper electrolytic cell, under the constant voltage of 9V, the current density is 480A / m 2 , continue electrolysis for 5.5 hours, when the solution turns light red, stop electrolysis.

[0052] Add 10mL of P204 extractant to the electrolytic residual solution for extraction, then back-extract with 10mL of sulfuric acid solution with a concentration of 2mol / L, and the water phase after back-extraction is for use.

[0053] In this embodiment, a total of 20.53 g of copper was recovered at the electrolytic cathode, and the recovery rate of copper was 98.5%.

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Abstract

The invention discloses a method for electrocatalytically treating waste browning liquid. The method comprises the following steps: adding a metal ion catalyst with a variable valence state to the waste browning liquid and stirring evenly; Electrolysis is carried out under the overpotential cathode, and the copper ions in the electrolyte are monitored in real time. When the concentration of copper ions in the electrolyte is less than 1g / L, the electrolysis is stopped; the variable valence metal ion catalyst refers to high price and strong Oxidative power of variable valence metal ion catalysts. After the electrolysis, the recovery and reuse of the cationic catalyst is realized through extraction and stripping operations. The present invention uses variable valence state metal ion catalysts to electrolyze the waste browning liquid, which can effectively degrade the copper-containing organic complexes in the waste browning liquid, so that the copper-containing complexes in the waste liquid release free copper ions and deposit on the cathode, improving the efficiency of the browning process. The recovery rate of copper in the waste browning liquid can be improved, and the catalyst can be recovered and reused through extraction, which effectively reduces the cost.

Description

technical field [0001] The invention relates to the technical field of browning treatment of printed circuit boards, in particular to the treatment of waste browning liquid, and in particular to an electrocatalytic method for treating waste browning liquid. Background technique [0002] Waste browning solution comes from the browning treatment process of printed circuit boards and is a product of browning solution failure. In order to meet the increasingly lightweight and portable needs of electrical equipment, printed circuit boards are developing towards refined and integrated multilayer circuit boards. In the lamination process of multilayer circuit boards, it is necessary to perform browning processing on the inner core boards in the multilayer circuit board in advance to improve the bonding force between the inner core boards. [0003] At present, during the browning treatment in this industry, the surface of the copper foil of the inner core board is micro-etched with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C25C1/12
CPCY02P10/20
Inventor 潘湛昌范红罗俊明胡光辉肖楚民魏志钢张晃初曾祥福
Owner VICTORY GIANT TECH HUIZHOU CO LTD
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