Sampling device of gaseous contaminant in material crushing process

A sampling device and pollutant technology, which is applied in the field of sampling devices for gaseous pollutants in the material crushing process, can solve the problems of lack of actual data, pollutant release and sample sampling technology and devices without research precedent, and pollution prevention and control work cannot be effectively obtained development and other issues to achieve the effect of simple structure

Inactive Publication Date: 2011-06-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing studies on the release characteristics and monitoring of pollutants in the crushing process of electronic waste materials are limited to simulations such as thermogravimetry and pyrolysis, lacking the support of actual data, so that pollution prevention and control wo

Method used

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  • Sampling device of gaseous contaminant in material crushing process
  • Sampling device of gaseous contaminant in material crushing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1, this device is used to test the gaseous pollutants in the crushing process of FR-4 copper clad laminates. Targets to be measured: phenolic compounds, hydrogen bromide, benzene, toluene, xylene, ethylbenzene, styrene. The sampling rate of phenolic absorption solution, hydrogen bromide absorption solution and activated carbon adsorption tube is 0.5L / min, the sampling rate of Tenax-GC tube is 0.3L / min, and the sampling time is 40min. At this time, the mass of crushed material is 1.8kg. After the sampling is completed, further analysis and testing are carried out. The detection limit requirements: toluene, ethylbenzene, xylene, styrene 0.004mg / m 3 , phenols 0.03mg / m 3 , hydrogen bromide 0.10mg / m 3 . The analysis result is: Benzene 0.140mg / m 3 , toluene 0.014mg / m 3 , ethylbenzene 0.011mg / m 3 , Xylene 0.033mg / m 3 , Styrene was not detected (3 ), hydrogen bromide was not detected (3 ), phenols were not detected (3 )

Embodiment 2

[0018] Example 2, the device is used to test the gaseous pollutants in the crushing process of the FR-4 circuit board. Targets to be measured: phenolic compounds, hydrogen bromide, benzene, toluene, xylene, ethylbenzene, styrene. Adoption process and analysis test method are identical with embodiment 1. The analysis result is: Benzene 0.081mg / m 3 , toluene 0.008mg / m 3 , ethylbenzene was not detected (3 ), xylene was not detected (3 ), styrene was not detected (3 ), hydrogen bromide was not detected (3 ), phenols were not detected (3 )

Embodiment 3

[0019] Embodiment 3, using the device to test the gaseous pollutants in the crushing process of FR-4 circuit boards with components. Targets to be measured: phenolic compounds, hydrogen bromide, benzene, toluene, xylene, ethylbenzene, styrene. Adoption process and analysis test method are identical with embodiment 1. The analysis result is: Benzene 0.248mg / m 3 , toluene 0.007mg / m 3 , ethylbenzene 0.013mg / m 3 , Xylene 3.13mg / m 3 , Styrene 0.023mg / m 3 , hydrogen bromide was not detected (3 ), phenols were not detected (3 ).

[0020] In the attached drawings: 1 is the feed port; 2 is the pulverizer drum; 3 is the undersize storage box; 4 is the dust collection cylinder; 5 is the dust bag; 6 is the induced draft fan; 7 is the pulverizer shell; Buffer tube; 9 is the gas splitter; 10 is the phenolic absorption liquid; 11 is the hydrogen bromide absorption liquid; 12 is the activated carbon adsorption tube; 13 is the Tenax-GC tube; 14 is the first sampler; 15 is the second samp...

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Abstract

The invention discloses a sampling device of gaseous contaminant in the material crushing process, which comprises a crusher. The feeding hole of the crusher extends into a rotary barrel, and the discharge hole of the rotary barrel extends into a storing box. The storing box is communicated with a dust collecting cylinder, and the dust collecting cylinder is communicated with a draught fan through a dust removing bag. A draught fan is connected with a gas buffer pipe, and four sampling rubber pipes are fixed in the gas buffer pipe. The first sampling rubber pipe is connected with a first sampler through phenolic absorbing liquid, the second sampling rubber pipe is connected with the first sampler through brominated hydrogen absorbing liquid, the third sampling rubber pipe is connected with a second sampler through an activated charcoal absorbing pipe, and the fourth sampling rubber pipe is connected with the second sampler through a Tenax-GC pipe. Excess gas is exhausted from a gas diversion port. Aiming at gaseous contaminant possibly produced during crushing, the gas samplers are used for respectively sampling different materials at an exhaust port. The sampling device can ensure that the contaminant is effectively monitored and data information is obtained and has the advantage of simple structure.

Description

technical field [0001] The invention relates to the technical field of electronic waste resource treatment, in particular to a sampling device for gaseous pollutants in the material crushing operation process. Background technique [0002] Circuit boards are an important part of electronic products and exist in all electronic and electrical products. With the popularization of electronic products and the acceleration of replacement, the generation of discarded circuit boards is increasing day by day. If improper disposal methods are adopted, the toxic and harmful substances in it will cause harm to the environment and human health. On the other hand, circuit boards contain more recyclable substances such as metal copper, glass fibers and a small amount of precious metals. At present, the most commonly used recycling technology at home and abroad is the mechanical physical method, that is, the circuit boards are crushed and sorted, and metal and non-metal materials are reco...

Claims

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Application Information

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IPC IPC(8): G01N1/24
Inventor 李金惠丁淑芳段华波黄伟朱孝东
Owner TSINGHUA UNIV
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