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A method for electrowinning and regenerating copper-containing etching waste liquid in acidic chlorination system

A technology for etching waste liquid and copper etching, which is used in the improvement of process efficiency, photography process, instruments, etc., to avoid running costs, strong metal luster and brightness, and good flatness and compactness.

Inactive Publication Date: 2017-10-17
WUXI RUISIKE ENVIRONMENTAL PROTECTION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the invention simplifies and makes the process flow feasible, solves various disadvantages existing in the existing process, and reduces equipment and operating costs

Method used

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  • A method for electrowinning and regenerating copper-containing etching waste liquid in acidic chlorination system

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Embodiment 1

[0028] A method for electrodeposition and regeneration of copper-containing etching waste liquid in an acidic chlorination system, comprising the following steps:

[0029] (1) Filter the copper-containing etching liquid waste liquid overflowing from the circuit board etching process, and pump the clarified copper-containing etching waste liquid without solid particles into the electrolyte circulation tank for subsequent use; the etching waste liquid copper The content is 80g / l, the concentration of hydrochloric acid is 1.5N;

[0030] (2) Pump the filtrate obtained in step (1) into the electrowinning tank for electrowinning and decoppering; the voltage of the electrowinning tank is 1.9V, and the current density is 500A / m 2 ; The temperature of the electrowinning waste liquid is 50°C;

[0031] (3) The cathode copper obtained in step (2) (when the weight of copper reaches 20kg) is dried with compressed air after scalding, and packed into the warehouse; the scalding condition is ...

Embodiment 2

[0037] A method for electrodeposition and regeneration of copper-containing etching waste liquid in an acidic chlorination system, comprising the following steps:

[0038] (1) Filter the copper-containing etching liquid waste liquid overflowing from the circuit board etching process, and pump the clarified copper-containing etching waste liquid without solid particles into the electrolyte circulation tank for subsequent use; the etching waste liquid copper The content is 130g / l, the concentration of hydrochloric acid is 2.2N;

[0039] (2) Pump the filtrate obtained in step (1) into the electrowinning tank for electrowinning and copper removal; the voltage of the electrowinning tank is 1.5V, and the current density is 100A / m 2 ; The temperature of the electrowinning waste liquid is 30°C;

[0040] (3) The cathode copper obtained in step (2) (when the weight of copper reaches 20kg) is dried with compressed air after scalding, and packed into the warehouse; the scalding condition...

Embodiment 3

[0046] A method for electrowinning and regenerating copper-containing etching waste liquid in an acidic chlorination system, comprising the following steps:

[0047](1) Filter the copper-containing etching liquid waste liquid overflowing from the circuit board etching process, and pump the clarified copper-containing etching waste liquid without solid particles into the electrolyte circulation tank for subsequent use; the etching waste liquid copper The content is 160g / l, the concentration of hydrochloric acid is 2.5N;

[0048] (2) Pump the filtrate obtained in step (1) into the electrowinning tank for electrowinning and decoppering; the voltage of the electrowinning tank is 2.0V, and the current density is 500A / m 2 ; The temperature of the electrowinning waste liquid is 20°C;

[0049] (3) The cathode copper obtained in step (2) (when the weight of copper reaches 20kg) is dried with compressed air after scalding, and packed into the warehouse; the scalding condition is that t...

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Abstract

Disclosed is an electrodeposition decoppering and regenerating method of waste copper-bearing etching liquor of an acidic chlorination system. The method comprises the steps that waste etching liquor generated in the etching process of a circuit board is filtered and then transferred into an electrodeposition tank for electrodeposition; a redox reaction happens in the electrodeposition process of the electrodeposition tank; and a first standard cathode copper board is separated out through a cathode, chlorine is separated out through an anode, and used for oxidizing the waste etching liquor to generate etching regenerated liquor, and electrodeposition decoppering and regenerating of the waste etching liquor are achieved. According to the method, the technological process is simple, and operation is easy; decoppered products can directly meet the requirements of standard products; and no chemical reagent is added in the regenerating process, the waste etching liquor is cyclically utilized online, and zero emission is achieved.

Description

technical field [0001] The present invention relates to the technical field of hydrometallurgy regeneration of non-ferrous metals and environmental protection regeneration, in particular to a method for extracting valuable metal copper and regenerating etching waste liquid from copper-containing etching waste liquid in acidic chlorination system of circuit board factory by using electrowinning technology method. Background technique [0002] Acidic chloride system copper-containing etching solution is an etching solution suitable for fine circuit processing and fine manufacturing of the inner layer of multi-layer boards. The solution has the characteristics of small side etching, stable etching rate, easy control and easy regeneration. Copper-containing etching waste liquid is the etching liquid after etching, which is characterized by high specific gravity, high turbidity, strong acidity and low redox potential. If these copper-containing etching waste liquids are not treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/46C25C1/12
CPCY02P10/20
Inventor 郭志敏郭峰林元吉
Owner WUXI RUISIKE ENVIRONMENTAL PROTECTION SCI & TECH CO LTD