Treatment method for acidic waste etching solution

A technology of acid etching waste liquid and its treatment method, which is applied in the field of electrolysis, can solve the problems of long process flow, excessive use of auxiliary materials, unfavorable safety and environmental protection, etc., and achieve the effects of short process flow, reduced increment, and environmental protection

Inactive Publication Date: 2020-04-17
HUIZHOU ZHENDING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above process has the following disadvantages at present: (1) the process is too long, uses more auxiliary materials, the operation is more complicated, and the cost is higher; (2) the generated solid slag is more, it is difficult to handle, and it is not good for safety and environmental protection; 3) HCl in waste acid is not recycled, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In the acidic etching waste solution of manufacturer A, the concentration of copper ions is 123g / l, and the acidity is 1.8N.

[0049] Acidic etching waste solution from electrolysis manufacturer A: During the electrolysis process, the anode reacts: 2Cl - -2e-=Cl 2 ; Reaction occurs at the cathode: Cu 2+ +e-=Cu + , Cu + +e-=Cu, after the electrolytic extraction of copper, the electrocleaning liquid is obtained, the copper content in the electrolytic liquid is 15g / L, and the acidity is 1.8N.

[0050] Take 2L of the electro-clear liquid and concentrate it under reduced pressure at a vacuum degree of 0.06mPa and a temperature of 70-90°C. First distill the electro-clear liquid to 1L to obtain 1L of the first distilled water. The acidity of the first distilled water is 0.08N Continue to distill the electroclean liquid to 500mL to obtain the second distilled water of 500mL and the concentrated solution of 500mL, the acidity of the second distilled water is 2.2N.

[0051] ...

Embodiment 2

[0055] In the acidic etching waste solution of manufacturer B, the concentration of copper ions is 130g / l, and the acidity is 1.8N.

[0056] Acidic etching waste solution from electrolysis manufacturer B: During the electrolysis process, the anode reacts: 2Cl --2e-=Cl 2 ; Reaction occurs at the cathode: Cu 2+ +e-=Cu + , Cu + +e-=Cu, after the electrolytic extraction of copper, the electrolytic solution is obtained, the copper content in the electrolytic solution is 10g / L, and the acidity is 1.8N.

[0057] Take 2L of the electro-clear liquid and concentrate it under reduced pressure at a vacuum degree of 0.075mPa and a temperature of 60-80°C. Distill the electro-clear liquid to 1L first to obtain 1L of the first distilled water. The acidity of the first distilled water is 0.08N Continue to distill the electroclean liquid to 500mL to obtain the second distilled water of 500mL and the concentrated solution of 500mL, the acidity of the second distilled water is 2.2N.

[0058]...

Embodiment 3

[0062] In the acidic etching waste solution of manufacturer C, the concentration of copper ions is 121g / l, and the acidity is 1.8N.

[0063] Acidic etching waste solution of electrolysis factory C: During the electrolysis process, the anode reacts: 2Cl - -2e-=Cl 2 ; Reaction occurs at the cathode: Cu 2+ +e-=Cu + , Cu + +e-=Cu, after the electrolytic extraction of copper, the electrocleaning liquid is obtained, the copper content in the electrolytic liquid is 5g / L, and the acidity is 1.8N.

[0064] Take 2L of the electro-clear liquid and concentrate it under reduced pressure at a vacuum degree of 0.085mPa and a temperature of 50-70°C. First distill the electro-clear liquid to 1L to obtain 1L of the first distilled water. The acidity of the first distilled water is 0.08N Continue to distill the electroclean liquid to 500mL to obtain the second distilled water of 500mL and the concentrated solution of 500mL, the acidity of the second distilled water is 2.2N.

[0065] Cool 50...

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Abstract

The invention discloses a treatment method for an acidic waste etching solution. The treatment method comprises the following steps of electrolyzing the acidic waste etching solution, so that copper ions in the acidic waste etching solution are deposited to obtain electrolyzed clear solutions; performing vacuum concentration for the electrolyzed clear solutions to obtain distilled water containinghydrochloric acid, and concentrated solutions; and cooling and crystallizing the concentrated solutions, and separating solids and liquid to obtain chloride solids and acidic solutions. Compared withthe prior art, the treatment method for the acidic waste etching solution has the advantages that copper can be recycled and the electrolyzed clear solutions are obtained after the acidic waste etching solution is electrolyzed; the hydrochloric acid can be recycled; concentrated solutions are cooled and crystallized to obtain the chloride solids and the acidic solutions, and the chloride solids can be used for preparing the acidic solutions; the acidic solutions can be used for replacing industrial hydrochloric acid, and reused in H2O/HCl series and NaClO3/HCl series acidic etching solutions;the technological process is shorter, and the increasing amount of the waste etching solution can be reduced greatly; and the treatment method benefits environmental protection.

Description

technical field [0001] The invention relates to the technical field of electrolysis, in particular to a treatment method for acidic etching waste liquid. Background technique [0002] Acid etching refers to the use of etching solution to dissolve and remove the exposed copper other than the line protection layer on the workpiece. During the etching process, when the concentration of monovalent copper ions in the etching solution reaches saturation, the etching solution loses its etching ability and forms an etching waste solution. Except that the waste liquid contains a large amount of copper ions, the rest of the composition is similar to that of the etching solution; therefore, the usual method of treating the etching waste liquid is electrolytic deposition of copper; the electrolytic solution after electrolytic deposition of copper contains hydrochloric acid, and the treatment of waste hydrochloric acid is generally adopted The process is: (1) quicklime neutralization tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C23F1/46
CPCC23F1/46C25C1/12Y02P10/20
Inventor 夏敏黄坚渤
Owner HUIZHOU ZHENDING ENVIRONMENTAL PROTECTION TECH CO LTD
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