Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

PH value method for removing arsenicum from acidic etching liquid of printed circuit board

A technology for printed circuit boards and acid etching solutions, which is applied in chemical instruments and methods, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. secondary pollution and other problems, to achieve the effect of easy control, low cost and small investment in equipment

Active Publication Date: 2013-07-24
深圳市东江饲料添加剂有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Prior art methods for removing arsenic from printed circuit board acidic etching waste liquid include neutralization precipitation, sulfide precipitation, ferrite precipitation and flocculation precipitation. Some of these methods have poor arsenic removal effect, and some It will cause secondary pollution, and some have higher costs; for example, in the prior art, there is a method for removing arsenic in acidic etching solution for printed circuit boards, which is to reduce the arsenic content by precipitation after adding titanium dioxide. This method has a good effect in removing arsenic, but The treatment cost of using titanium dioxide is high; therefore, it is an urgent problem for those skilled in the art to find a set of effective methods for removing arsenic from the acidic etching waste liquid of printed circuit boards under the premise of cost control

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of pH value method that removes arsenic from printed circuit board acid etching solution, comprises the steps:

[0038] A 0 , Sampling analysis and detection: get 500 milliliters of acidic etching waste liquid of printed circuit board to be processed, and sample is analyzed and detected to the acidic etching waste liquid of printed circuit board to be processed, and its arsenic content is 3.0ppm, namely 3.0 mg / L;

[0039] A, pH adjustment: Pour 500 milliliters of the printed circuit board acidic etching waste liquid into the reaction kettle, then slowly drip the cupro ammonia solution into the reaction kettle, about 120 grams of cupro ammonia solution is needed, adjust The pH value of the acidic etching waste liquid in the reactor is about 2.5;

[0040] B. Flocculation and precipitation:

[0041] ① Weighing, take 0.6 grams of polyacrylamide PAM as flocculant;

[0042] ② Configure the PAM solution, dilute the weighed flocculant with water, for example, add 0.6...

Embodiment 2

[0047] A kind of pH value method that removes arsenic from printed circuit board acid etching solution, comprises the steps:

[0048] A 0 , Sampling analysis and detection: get 500 milliliters of acidic etching waste liquid of printed circuit board to be processed, and sample analysis and detection of waste acidic etching liquid of printed circuit board to be processed, its arsenic content is 1.5ppm, namely 1.5 mg / L;

[0049] A. pH value adjustment: Pour 500 ml of the acidic etching waste liquid of the printed circuit board into the reactor, then slowly drip ammonia water into the reactor, and adjust the acidic etching waste liquid in the reactor The pH value is about 2.2;

[0050] B. Flocculation and precipitation:

[0051] ① Weighing, take 0.6 grams of polyacrylamide PAM as flocculant;

[0052] ② Configure the PAM solution, dilute the weighed flocculant with water, for example, add 0.6 g of PAM to 4 ml of water, stir to form a viscous solution;

[0053] ③ Add the config...

Embodiment 3

[0057] A kind of pH value method that removes arsenic from printed circuit board acid etching solution, comprises the steps:

[0058] A 0 , Sampling analysis and detection: 60 cubic meters of acidic etching waste liquid of printed circuit boards to be treated were sampled for analysis and detection, and the arsenic content was 2.5ppm, that is, 2.5 mg / L;

[0059] A. pH value adjustment: pump 60 cubic meters of acidic etching waste liquid of printed circuit boards to be treated into the treatment pool, and then add the cupro ammonia solution into the treatment pool by means of the pump, about 14,400 kg of cupro ammonia solution is needed , adjusting the pH value of the acidic etching waste liquid in the treatment tank to about 2.5; between the pump and the treatment tank, a regulating valve is arranged, and the flow rate when the copper ammonia solution is added is controlled by the regulating valve;

[0060] B. Flocculation and precipitation:

[0061] ① Weighing, take 60 kg o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a pH value method for removing arsenicum from the acidic etching liquid of a printed circuit board. The pH value method comprises the steps of: adjusting the pH value of the waste acidic etching liquid to be treated of the printed circuit board to 2.0-3.0; settling flocculent: (1) taking 0.8-1.5kg of flocculating agent in terms of the waste acidic etching liquid to be treated per cubic meter of the printed circuit board, (2) diluting the flocculating agent with water, and stirring to prepare into a viscous solution, and (3) adding the flocculating agent solution into the waste acidic etching liquid subjected to pH value regulation, stirring for 3-20 min, and then standing for 3-6 h; filtering to remove precipitates to obtain the waste arsenicum-removed acidic etching liquid of the printed circuit board. According to the pH value method for removing the arsenicum in the invention, a pH value regulation method and a flocculent settling method are jointly used, the arsenicum removal treatment of the waste acidic etching liquid of the printed circuit board is realized under the condition of low cost, and the pH value method has the advantages of low treatment cost, simplicity in operation, small equipment investment and the like, and is suitable for the arsenicum removal treatment of a large amount of waste acidic etching liquid of the printed circuit board.

Description

【Technical field】 [0001] The invention relates to multi-stage treatment for removing specific dissolved substances in waste water, in particular to a method for removing arsenic from printed circuit board etching waste liquid, and in particular to a pH value method for removing arsenic from printed circuit board acidic etching liquid. 【Background technique】 [0002] Printed circuit board etching waste liquid (also known as PCB etching waste liquid) includes alkaline etching waste liquid and acidic etching waste liquid. Among them, the acidic etching waste liquid of printed circuit board has high content of copper and chloride ions, which is acidic and contains arsenic. and other impurities; the basic copper chloride produced from the acidic etching waste liquid of printed circuit boards has strict requirements on the content of arsenic, the lower the arsenic content, the better. Before the copper is melted, the acidic etching waste liquid of the printed circuit board needs t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F101/20
Inventor 高仁富邝国生兰永辉孙荣斌许世爱彭韬肖华
Owner 深圳市东江饲料添加剂有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com