有色金属科学与工程2024，Vol.15Issue(1)：43-50,8.DOI:10.13264/j.cnki.ysjskx.2024.01.006
热重分析法对废旧电路板热解过程动力学和热力学分析
Kinetics and thermodynamics during pyrolysis of scrap printed circuit board by TGA
摘要
Abstract
Scrap printed circuit board(SPCB)is a typical organic waste,which could be utilized as a resource by pyrolysis technology.The pyrolysis characteristics of SPCB were studied by thermogravimetric analysis(TGA)to reveal the reaction kinetics and thermodynamics during the pyrolysis process.Under N2 atmosphere,the effects of different heating rates,e.g.5℃ /min,10℃ /min and 15℃ /min,on the thermal decomposition behavior of SPCB were investigated in detail.The results observed showed that the pyrolysis process was mainly occurred in the temperature range of about 250℃ to 400℃ .With the increase of heating rates,the thermogravimetry(TG)curves of SPCB was gradually deviated to the high temperature direction.For the derivative thermogravimetry(DTG)curves,there was an obvious mass loss peak,and the corresponding peak temperature kept increasing,indicating that there was a significant thermal hysteresis phenomenon.The Flynn-Wall-Ozawa(FWO)model,Kissinger-Akahira-Sunose(KAS)model and Friedman(FM)model were used to analyze the thermogravimetric data.The average apparent activation energies(Ea)were 168.46 kJ/mol,167.31 kJ/mol and 234.84 kJ/mol,respectively,which increased with the increase of conversion rate.The thermodynamic parameters were calculated using FWO model.Under the same heating rate,the Gibbs free energy change(ΔG)was gradually decreased with the increase of conversion rate,while the corresponding enthalpy change(ΔH)and entropy change(ΔS)were all increased.Meanwhile,at the same conversion,both of ΔH and ΔS decreased slightly with the increase of heating rate,while ΔG was increased gradually.关键词
废旧电路板/热解特性/动力学/热力学Key words
scrap printed circuit board/pyrolysis characteristics/kinetics/thermodynamics分类
化学化工引用本文复制引用
阳宇,夏勇,王君,欧阳少波,熊道陵,李立清..热重分析法对废旧电路板热解过程动力学和热力学分析[J].有色金属科学与工程,2024,15(1):43-50,8.基金项目
江西省自然科学基金资助项目(2020BAB214021) （2020BAB214021）
江西省教育厅科学技术研究资助项目(GJJ200809) （GJJ200809）
陕西省自然科学基金资助项目(2021JQ-840) （2021JQ-840）
江西理工大学大学生创新创业训练资助项目(DC2022-004) （DC2022-004）
