Volatility of cadmium during pyrolysis of typical low rank coals

ZHOU Ling-mei; WANG Xiao-bing; MA Chen; LIU Shuang; MA Mao-lin; LIU Jiao-jiao

doi:10.1016/S1872-5813(21)60066-X

Volume 49 Issue 5

May 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(5): 648-655

ZHOU Ling-mei, WANG Xiao-bing, MA Chen, LIU Shuang, MA Mao-lin, LIU Jiao-jiao. Volatility of cadmium during pyrolysis of typical low rank coals[J]. Journal of Fuel Chemistry and Technology, 2021, 49(5): 648-655. doi: 10.1016/S1872-5813(21)60066-X

Citation:

ZHOU Ling-mei, WANG Xiao-bing, MA Chen, LIU Shuang, MA Mao-lin, LIU Jiao-jiao. Volatility of cadmium during pyrolysis of typical low rank coals[J]. Journal of Fuel Chemistry and Technology, 2021, 49(5): 648-655. doi: 10.1016/S1872-5813(21)60066-X

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Volatility of cadmium during pyrolysis of typical low rank coals

doi: 10.1016/S1872-5813(21)60066-X

School of Chemical & Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Funds: The project was supported by the National Key Research and Development Program of China (2016YFB0600304), the National Natural Science Foundation of China (51804313), the Fundamental Research Funds for the Central Universities (2020YQHH08) and Yue Qi Young Scholar Project, China University of Mining & Technology, Beijing (2020QN10).

Received Date: 2020-01-06
Rev Recd Date: 2021-02-03

Available Online: 2021-03-11

Publish Date: 2021-05-15

Abstract

Abstract

The distribution of cadmium (Cd) occurrence modes in a Naomaohu coal (NMH) and an Inner Mongolia high sulfur coal (GL) was investigated using the sequential chemical extraction method. The influence of the occurrence modes, final pyrolysis temperature, heating rate and residence time on the release behavior of Cd during the pyrolysis of two raw coals at 400-800 ℃ in a horizontal / vertical tubular furnace was examined respectively. The simulation of the migration and transformation of Cd under ideal conditions by FactSage software was carried out. The results show that Cd in NMH and GL is present in an organic matter state by 46% and 37%, a carbonate state by 32% and 24%, a disulfide state by 12% and 1%, and an aluminosilicate state by 10% and 38%, respectively. The distribution of occurrence modes seriously affects the volatilization behavior of Cd, in which the Cd in the organic matter state is easy to volatilize at low temperature, while those in the carbonate, aluminosilicate and sulfide state can volatilize at medium and high temperature; and reducing pyrolysis rate and extending residence time are conducive to the release of Cd. The FactSage simulation shows that Cd, CdO, Cd(OH)_x and CdS are the major gaseous products of Cd during the pyrolysis of NMH and GL coal, and the difference of volatilization behavior of Cd in two kinds of coal is mainly determined by pyrolysis temperature, distribution of occurrence modes and coal rank, which are in good agreement with the experimental results.
- pyrolysis,
- distribution of occurrence modes,
- release law,
- heavy metal Cd,
- FactSage simulation

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References(29)

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