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Method for online recovery of copper and chlorine from acidic waste etching liquid and regeneration of etching liquid

A technology of acidic etching waste liquid and etching waste liquid, which is applied in the field of regeneration of chlorine gas and etching liquid, and online recovery of copper from acidic etching waste liquid, so as to achieve the effect of improving recovery rate and avoiding increment

Active Publication Date: 2020-08-21
KANFORT JIANGMEN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the shortcomings of the existing diaphragm electrodeposition method and improve the recovery rate of copper, the present invention provides a method for on-line recovery of copper, chlorine gas and etching solution regeneration from acidic etching waste liquid

Method used

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  • Method for online recovery of copper and chlorine from acidic waste etching liquid and regeneration of etching liquid

Examples

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Effect test

Embodiment 1

[0041] The acidic etching waste liquid is taken from the etching production line of a circuit board factory in Hubei. The factory produces 200-300 tons of acidic etching waste liquid every month, containing 126.29 grams / liter of copper and 91.35 grams / liter of hydrochloric acid. 70% of the electrowinning liquid is transported to the diaphragm electrolyzer, and at 40°C, direct current is applied to produce copper plates, chlorine gas, and electrowinning waste liquid. After the electrowinning waste liquid absorbs chlorine gas in the dissolving and absorbing tank, hydrochloric acid is added to make the hydrochloric acid content of the solution 2.6mol / L, add sodium chlorate to make the ORP value of the solution 500mv, and then return the new etching solution to the etching process, and the cathode copper plate in the electrolytic cell can be stripped and recovered after 6 days of electrolysis; meanwhile, 30% of the total amount of acidic etching waste liquid % into the reaction ke...

Embodiment 2

[0044] The acidic etching waste liquid is taken from the etching production line of a circuit board factory in Guangdong. The factory produces 300-350 tons of acidic etching waste liquid every month, containing 115.39 g / L of copper and 105.40 g / L of hydrochloric acid. 60% of the electrowinning liquid is transported to the diaphragm electrolyzer, and at 45°C, direct current is applied to generate copper plates, chlorine gas, and electrowinning waste liquid. After the electrowinning waste liquid absorbs chlorine gas in the dissolving and absorbing tank, hydrochloric acid is added to make the hydrochloric acid content of the solution 2.9mol / L, add sodium chlorate to make the ORP value of the solution 460mv, and then return the new etching solution to the etching process, and the cathode copper plate in the electrolytic cell can be stripped and recovered after 7 days of electrolysis; at the same time, 40% of the total amount of acidic etching waste solution % into the reaction ket...

Embodiment 3

[0047] The acidic etching waste liquid is taken from the etching production line of a circuit board factory in Jiangsu. The factory produces 200-250 tons of acidic etching waste liquid every month, containing 109.39 grams / liter of copper and 121.75 grams / liter of hydrochloric acid. 75% of the electrowinning liquid is transported to the diaphragm electrolyzer, and at 48°C, direct current is applied to generate copper plates, chlorine gas, and electrowinning waste liquid. After the electrowinning waste liquid absorbs chlorine gas in the dissolving and absorbing tank, hydrochloric acid is added to make the hydrochloric acid content of the solution 3.2mol / L, add sodium chlorate to make the ORP value of the solution 480mv, and then return the new etching solution to the etching process, and the cathode copper plate in the electrolytic cell can be stripped and recovered after 6 days of electrolysis; at the same time, 25% of the total amount of acidic etching waste liquid % into the ...

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Abstract

The invention provides a method for online recovery of copper and chlorine from acidic waste etching liquid and regeneration of the etching liquid. The method comprises the following steps of electrolysis of the waste etching liquid, regeneration of the etching liquid, recovery of cathode copper, copper reduction, solid-liquid separation, chlorine absorption and tail gas treatment. A part of the acidic etching waste liquid is conveyed into a reaction kettle for copper reduction, that is, an iron powder reduction method is added on the basis of a diaphragm electrodeposition method, copper ionsin the acidic etching waste liquid are reduced into copper powder by adding iron powder, the solution is converted into a ferrous chloride solution, the ferrous chloride solution is used for absorbingresidual chlorine or serving as a product, an open circuit is provided for a closed circulation system of an electrolysis module and an etching process solution, the problems that the system salt istoo high, impurities are accumulated and the etching rate is reduced are solved, the increment of the etching process solution is avoided, and the recovery rate of copper is increased.

Description

technical field [0001] The invention relates to the technical field of recovery of etching waste liquid, in particular to a method for online recovery of copper and chlorine from acidic etching waste liquid and regeneration of etching liquid. Background technique [0002] In industrial production, especially PCB production, acid etching is a common etching method. Acid etching mainly uses the acid chloride etching solution system to etch the copper on the copper clad laminate, and at the same time uses the cyclic electrolysis technology to electrodeposit the copper in the etching solution after copper etching, so as to ensure the equilibrium concentration of the copper content in the etching solution and restore Various technical parameters of its copper etching, such as the concentration of divalent copper ions, acidity, redox potential, etc., enable the electrochemically regenerated etching solution to return to the PCB production line for copper etching operations to achi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/46C25C1/12C01G49/10C22B15/00C22B7/00
CPCC23F1/46C25C1/12C22B15/0091C01G49/10C22B7/006Y02P10/20
Inventor 陆柏灿沈天晓朱振华何天阳
Owner KANFORT JIANGMEN ENVIRONMENTAL TECH CO LTD
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