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锅炉协同处置危险废物过程中Pb和Cd的挥发特性

肖海平 陈宇 闫大海 李丽 王宁 彭政 王琪

肖海平, 陈宇, 闫大海, 李丽, 王宁, 彭政, 王琪. 锅炉协同处置危险废物过程中Pb和Cd的挥发特性[J]. 环境科学研究, 2016, 29(2): 254-261.
引用本文: 肖海平, 陈宇, 闫大海, 李丽, 王宁, 彭政, 王琪. 锅炉协同处置危险废物过程中Pb和Cd的挥发特性[J]. 环境科学研究, 2016, 29(2): 254-261.
XIAO Haiping, CHEN Yu, YAN Dahai, LI Li, WANG Ning, PENG Zheng, WANG Qi. Volatilization Characteristics of Lead and Cadmium During Co-Processing of Hazardous Waste in Boilers[J]. Research of Environmental Sciences, 2016, 29(2): 254-261.
Citation: XIAO Haiping, CHEN Yu, YAN Dahai, LI Li, WANG Ning, PENG Zheng, WANG Qi. Volatilization Characteristics of Lead and Cadmium During Co-Processing of Hazardous Waste in Boilers[J]. Research of Environmental Sciences, 2016, 29(2): 254-261.

锅炉协同处置危险废物过程中Pb和Cd的挥发特性

基金项目: 国家环境保护公益性行业科研专项(201209023);中央高校基本科研业务费专项资金项目(2014MS19) ;中挪合作项目(CHN 2150 09/059)

Volatilization Characteristics of Lead and Cadmium During Co-Processing of Hazardous Waste in Boilers

  • 摘要: 为研究危险废物在锅炉协同处置过程中Pb和Cd的挥发特性,通过共燃烧和消解试验,研究了不同化合物形态下Pb、Cd的挥发率(α)、残留率(r)和表观活化能(E). 结果表明:以硫化物、氯化物、硫酸盐和氧化物存在的Pb、Cd的挥发率与温度(T)和停留时间(t)均呈正相关. 当温度低于950 ℃、停留时间为52 min时,不同化合物形态的Pb、Cd挥发率相差较大,PbCl2在800 ℃下挥发率接近64%,而PbO仅为17%;温度高于1 250 ℃、停留时间为52 min时,不同化合物形态下的Pb、Cd挥发率均大于95%,接近于完全挥发;1 400 ℃时,不同化合物形态的Pb、Cd在燃烧残渣中的残留率均低于0.3%. 结合化学反应动力学理论,对Pb、Cd在锅炉协同处置过程中的挥发特性进行动力学模拟,得到PbS、PbCl2、PbSO4、PbO 中Pb的表观活化能分别为23.64、18.44、65.79、61.35 kJ/mol,CdS、CdCl2、CdSO4、CdO中Cd的表观活化能分别为53.22、20.87、42.42、28.75 kJ/mol. 由表观活化能数据可以得出不同形态化合物的Pb、Cd挥发率随温度和停留时间变化的动力学方程α=f(T,t),并可预测锅炉协同处置危险废物过程中Pb和Cd的挥发率,确定适合锅炉协同处置的危险废物类别.

     

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出版历程
  • 收稿日期:  2015-07-07
  • 修回日期:  2015-10-28
  • 刊出日期:  2016-02-25

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