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Resource recovery method of sodium persulfate-sulfuric acid serial copper-containing microetch waste liquor for PCB (Printed Circuit Board)

A technology of sodium persulfate, sulfuric acid system, applied in copper sulfate, chemical instruments and methods, multi-stage treatment of water/sewage, etc., can solve the problems of low treatment cost, low resource utilization, high treatment cost, and achieve low production cost. , Wastewater treatment is simple, the effect of less corrosive

Active Publication Date: 2015-06-24
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the existing treatment methods for copper-containing micro-etch waste liquid of PCB sodium persulfate-sulfuric acid system, such as high treatment cost and low resource utilization, the purpose of the present invention is to provide a low treatment cost and high resource utilization. Treatment method of PCB sodium persulfate-sulfuric acid system containing copper micro-etching waste liquid

Method used

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  • Resource recovery method of sodium persulfate-sulfuric acid serial copper-containing microetch waste liquor for PCB (Printed Circuit Board)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) To the collected PCB sodium persulfate-sulfuric acid system copper-containing micro-etching waste liquid (containing copper 20.36g / L, sodium persulfate 26.69g / L, acidity (in H + Add chlorine-free copper oxide mud to about 1.05g / L), adjust the pH value to 0.5, remove insoluble matter, and obtain clear liquid;

[0027] (2) Prepare a 2 mol / L solution with industrial grade sodium carbonate;

[0028] (3) Add a small amount of distilled water to the reaction kettle, turn on the stirring device, and raise the temperature to 40°C at the same time, then add the clear liquid obtained in step (1) and the sodium carbonate solution obtained in step (2) to the In the reaction kettle, the pH value is controlled at 5.0, and the stirring speed is 200r / min;

[0029] (4) Keep the pH value, reaction temperature and stirring speed constant after the addition of the material and liquid, and continue the reaction for 10 minutes to obtain the reaction product; ...

Embodiment 2

[0033] (1) To the collected PCB sodium persulfate-sulfuric acid system copper-containing micro-etching waste liquid (containing copper 20.36g / L, sodium persulfate 26.69g / L, acidity (in H + Add sodium carbonate to about 1.05g / L), adjust the pH value to 1.0, remove insoluble matter, and obtain clear liquid;

[0034] (2) Prepare a 1.0mol / L solution with reagent grade sodium bicarbonate;

[0035] (3) Add a small amount of the clear liquid obtained in step (1) to the reactor, turn on the stirring device, and raise the temperature to 90°C at the same time, then mix the clear liquid obtained in step (1) and the clear liquid obtained in step (2) The sodium bicarbonate solution is added to the reaction kettle at the same time, the pH is controlled at 3.5, and the stirring speed is 150r / min;

[0036] (4) Keep the pH value, reaction temperature and stirring speed unchanged after the addition of the material and liquid, and continue the reaction for 30 minutes ...

Embodiment 3

[0040] (1) To the collected PCB sodium persulfate-sulfuric acid system copper-containing micro-etching waste liquid (containing copper 20.36g / L, sodium persulfate 26.69g / L, acidity (in H + Add chlorine-free copper oxide mud to about 1.05g / L), adjust the pH value to 0.5, remove insoluble matter, and obtain clear liquid;

[0041] (2) Prepare a 0.5 mol / L solution with industrial grade sodium carbonate;

[0042] (3) Add a small amount of distilled water to the reaction kettle, turn on the stirring device, and raise the temperature to 35°C at the same time, then add the clear liquid obtained in step (1) and the sodium carbonate solution obtained in step (2) to the In the reaction kettle, the pH value is controlled at 6.0, and the stirring speed is 200r / min;

[0043] (4) Keep the pH value, reaction temperature and stirring speed constant after the addition of the material and liquid, and continue the reaction for 50 minutes to obtain the reaction product...

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Abstract

The invention discloses a resource recovery method for copper-containing micro-etching waste liquid of PCB sodium persulfate-sulfuric acid system, and relates to the field of treatment methods for PCB production wastewater. The object of the present invention is to provide a kind of treatment method of PCB sodium persulfate-sulfuric acid system copper-containing micro-etching waste liquid with low processing cost and high resource utilization, the main steps are: add a small amount of distilled water as bottom liquid in the reaction kettle, wait When the reaction temperature rises to 35-90°C, turn on the stirring device, and add the pretreated micro-etching waste liquid and lye to the reaction kettle for reaction. During the process of adding the material and liquid, the pH value is controlled to be 3-6. The lye is one or a mixture of sodium carbonate solution and sodium bicarbonate solution. All waste treatment stations and PCB production enterprises can use the method of the present invention to carry out resource recovery treatment on copper-containing micro-etch waste liquid of sodium persulfate-sulfuric acid system.

Description

technical field [0001] The invention relates to the field of treatment methods for PCB production wastewater, in particular to a resource recovery method for copper-containing micro-etching waste liquid obtained after treating PCBs with a sodium persulfate-sulfuric acid system micro-etching liquid. Background technique [0002] PCB (Printed Circuit Board), the Chinese name is printed circuit board, also known as printed circuit board, printed circuit board, is an important electronic component, a support for electronic components, and a provider of electrical connections for electronic components. There are more than 20 production processes of PCB, among which the pre-treatment of many processes must be micro-etched, such as copper sinking (PTH) process, inner layer pre-treatment, thickened copper (PATT) production line, pattern plating (PLAT) process, green Oil pretreatment, OSP treatment, etc., must use micro-etching solution to remove the oxide layer on the copper surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G3/10C02F9/04
Inventor 毛谙章周兆安张银亮郑帅飞朱茜刘小文廖春华易海洋
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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