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Method for removing arsenic from printed-circuit board alkaline waste etching liquid

A technology for printing circuit boards and etching waste liquid, which is applied in chemical instruments and methods, multi-stage treatment of water/sewage, water pollutants, etc., can solve the problems of poor arsenic removal effect, high cost, secondary pollution, etc. To achieve the effect of easy control, low cost and small equipment investment

Active Publication Date: 2012-12-26
深圳市东江饲料添加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Prior art methods for removing arsenic from printed circuit board alkaline etching waste liquid include neutralization precipitation method, sulfide precipitation method, ferrite precipitation method and flocculation precipitation method. Some of these methods have poor arsenic removal effect and some Some will cause secondary pollution, and some have higher costs; therefore, it is more urgent for those skilled in the art to find a set of methods with good arsenic removal effect from the alkaline etching waste liquid of printed circuit boards under the premise of cost control the puzzle

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] A method for removing arsenic from printed circuit board alkaline etching waste liquid, comprising the steps of:

[0042] A 00 , sampling analysis and detection: get 500 milliliters of alkaline etching waste liquid of printed circuit board to be processed, to this waste liquid of alkaline etching of printed circuit board to be processed, sampling is analyzed and detected, and its arsenic content is 10ppm, namely 10 mg / L;

[0043] A 0 Pre-treatment: Pour 500 ml of the printed circuit board alkaline etching waste liquid into the reaction kettle, heat it to 80-90°C, then add 0.35 g of nano-scale activated carbon, and let it stand for 3 hours to absorb the alkaline Organic foam and impurities in the etching solution;

[0044] A. Magnesium chloride precipitation:

[0045] 1. weigh, take by weighing the magnesium chloride of 0.6 gram;

[0046] ② configure magnesium chloride solution, dilute the weighed magnesium chloride with water, such as adding 0.6 g of magnesium chlo...

Embodiment 2

[0055] A method for removing arsenic from printed circuit board alkaline etching waste liquid, comprising the steps of:

[0056] A 00 , sampling analysis and detection: the printed circuit board alkaline etching waste liquid to be treated is sampled for analysis and detection, and its arsenic content is 8ppm, i.e. 8 mg / liter;

[0057] A 0Pre-treatment: pump 60 cubic meters of alkaline etching waste liquid of printed circuit board into the treatment pool, heat it to 80-90°C, then add 30 kg of activated carbon to the nano-scale activated carbon, and let it stand for 5 hours to absorb organic foam and impurities in the alkaline etching solution;

[0058] A. Magnesium chloride precipitation:

[0059] 1. weigh, take by weighing 60 kilograms of magnesium chloride;

[0060] 2. configure magnesium chloride solution, dilute the weighed magnesium chloride with water, such as adding 60 kg of magnesium chloride to 1000 liters of water, stir to make it completely dissolved;

[0061] ③...

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PUM

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Abstract

The invention discloses a method for removing arsenic from printed-circuit board (PCB) alkaline waste etching liquid. The method comprises the following steps: weighing magnesium chloride according to a certain ratio of 0.8-1.5 kilograms of the magnesium chloride to 1 stere of the PCB, and adding the magnesium chloride to the PCB alkaline waste etching liquid; carrying out a flocculation and precipitation, wherein a flocculant is weighed according to a certain ratio of 0.8-1.5 kilograms of the flocculant to 1 stere of the PCB, then diluting the flocculant through water to prepare a viscous solution, followed by adding the flocculant solution to the alkaline waste etching liquid subjected to the precipitation through the magnesium chloride, and stirring and standing; filtering the precipitate to obtain the PCB alkaline waste etching liquid removed of the arsenic. According to the method provided by the present invention, the magnesium chloride precipitation method and the flocculation and precipitation method are combined, and the treatment for removing the arsenic from the PCB alkaline waste etching liquid in the case of low cost is realized, such that the method has advantages of low treatment cost and high removal rate of the arsenic, and is applicable for the treatments for removing the arsenic from a plurality of the PCB alkaline waste etching liquid.

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, especially to a method for removing arsenic from printed circuit board alkaline etching waste 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, printed circuit board alkaline etching waste liquid contains high copper and ammonia content, which is alkaline and contains Impurities such as arsenic; the basic copper chloride produced from the alkaline etching waste liquid of printed circuit boards has strict requirements on the content of arsenic. The lower the arsenic content, the better. Before basic copper chloride, it is necessary to carry out pre-treatment of arsenic removal on the alkaline etchi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/10C02F1/56
Inventor 兰永辉彭韬许世爱高仁富孙荣斌肖华邝国生
Owner 深圳市东江饲料添加剂有限公司