EFFECTS OF A ZEOLITE ON PYROLYSIS CHARACTERISTICS OF WASTE PRINTED CIRCUIT BOARDS

YANG Fan; YE Zi-wei; CHEN Nan-wei; REN Jie; LIN Wei-xiong; ZHANG Wen-zhi; ZHAO Ke-ming; SUN Shui-yu

doi:10.13205/j.hjgc.202108022

Volume 39 Issue 8

Jan. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(8): 156-164

YANG Fan, YE Zi-wei, CHEN Nan-wei, REN Jie, LIN Wei-xiong, ZHANG Wen-zhi, ZHAO Ke-ming, SUN Shui-yu. EFFECTS OF A ZEOLITE ON PYROLYSIS CHARACTERISTICS OF WASTE PRINTED CIRCUIT BOARDS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(8): 156-164. doi: 10.13205/j.hjgc.202108022

Citation:

YANG Fan, YE Zi-wei, CHEN Nan-wei, REN Jie, LIN Wei-xiong, ZHANG Wen-zhi, ZHAO Ke-ming, SUN Shui-yu. EFFECTS OF A ZEOLITE ON PYROLYSIS CHARACTERISTICS OF WASTE PRINTED CIRCUIT BOARDS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(8): 156-164. doi: 10.13205/j.hjgc.202108022

Citation:

YANG Fan, YE Zi-wei, CHEN Nan-wei, REN Jie, LIN Wei-xiong, ZHANG Wen-zhi, ZHAO Ke-ming, SUN Shui-yu. EFFECTS OF A ZEOLITE ON PYROLYSIS CHARACTERISTICS OF WASTE PRINTED CIRCUIT BOARDS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(8): 156-164. doi: 10.13205/j.hjgc.202108022

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EFFECTS OF A ZEOLITE ON PYROLYSIS CHARACTERISTICS OF WASTE PRINTED CIRCUIT BOARDS

doi: 10.13205/j.hjgc.202108022

YANG Fan^1,4,5,6,
YE Zi-wei^1,4,5,6,
CHEN Nan-wei^1,4,5,6,
REN Jie^1,4,5,6,
LIN Wei-xiong^3,4,5,6,
ZHANG Wen-zhi^1,4,5,6,
ZHAO Ke-ming^1,4,5,6,
SUN Shui-yu^{1,2,4,5,6
,
,}

1. Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, China;
2. School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China;
3. Zhaoqing University, Zhaoqing 526061, China;
4. Guangdong Engineering and Technology Research Center of Solid Waste Resource Recovery and Heavy Metal Pollution Control, Foshan 528216, China;
5. Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Prevention and Vocational Education of Environmental Protection of Guangdong Province, Foshan 528216, China;
6. Foshan Engineering and Technology Research Center of Heavy Metal Pollution Prevention and Resources Comprehensive Utilization, Foshan 528216, China

Received Date: 2020-09-16
Available Online: 2022-01-18

Abstract

Abstract

In this article, thermogrmetric analysis was used to study the pyrolysis characteristics of waste printed circuit boards (WPCBs) under different atmospheres (air and nitrogen) and with different catalysts (4A and 5A). Various comprehensive pyrolysis characteristic curves were calculated, and the pyrolysis kinetic equations were established. The experimental results indicated that there are three obvious weight loss peaks in the pyrolysis curve of WPCBs under air atmosphere, corresponding to the volatile emission and pyrolysis, the decomposition of refractory organic matter and the fixed carbon pyrolysis respectively. Then, the two obvious weight loss peaks appeared in the WPCBs combustion curve under air atmosphere, corresponding to the volatile emission and pyrolysis and the decomposition of refractory organic matters. In the atmosphere of air and nitrogen, with the addition of catalyst (4A and 5A), the weight loss peak of water precipitation in WPCBs pyrolysis characteristic curve was significantly enhanced, and the strength of volatilization analysis and weight loss peak of pyrolysis and decomposition of refractory organic matter was significantly reduced. Under nitrogen atmosphere, WPCBs pyrolysis had higher volatile characteristic index D, flammability index C and comprehensive combustion index S, while the burnout index Cb was smaller. Nevertheless, the apparent activation energy (E_av) of WPCBs pyrolysis under different atmosphere and catalyst conditions was calculated by using Coats-Redfern integral method. The E_av was 227.29 kJ/mol (air or nitrogen) and 72.35~115.99 kJ/mol (air/nitrogen+4A/5A). After correction, the average mass apparent activation energy E_m was 76.38 kJ/mol (air), 115.09 kJ/mol (nitrogen), ≤47.26 kJ/mol (air/nitrogen+4A/5A). Consequently, the reaction mechanisms of the pre-peak of the first volatile stage could be described as f(α)=(1-α)^0.5, while the post-peak of the first volatile, the pre-peak and post-peak of the second volatile stage and the fixed carbon combustion stage could be described as f(α)=(1-α)².
- waste printed circuit board (WPCBs),
- A zeolite,
- combustion characteristic,
- kinetics model,
- Coats-Redfern

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References(22)

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