Release characteristics of arsenic, selenium, lead and transformation of minerals during ashing process of coal

LI Yang; LU Zi-long; YANG He; JIN Li-jun; HU Hao-quan

doi:10.1016/S1872-5813(21)60115-9

Volume 50 Issue 1

Jan. 2022

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LI Yang, LU Zi-long, YANG He, JIN Li-jun, HU Hao-quan. Release characteristics of arsenic, selenium, lead and transformation of minerals during ashing process of coal[J]. Journal of Fuel Chemistry and Technology, 2022, 50(1): 11-18. doi: 10.1016/S1872-5813(21)60115-9

Citation:

LI Yang, LU Zi-long, YANG He, JIN Li-jun, HU Hao-quan. Release characteristics of arsenic, selenium, lead and transformation of minerals during ashing process of coal[J]. Journal of Fuel Chemistry and Technology, 2022, 50(1): 11-18. doi: 10.1016/S1872-5813(21)60115-9

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Release characteristics of arsenic, selenium, lead and transformation of minerals during ashing process of coal

doi: 10.1016/S1872-5813(21)60115-9

State Key Laboratory of Fine Chemicals, Institute of Coal Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

Funds: The project was supported by National Key R&D Program of China (2018YFB0605104), National Natural Science Foundation of China (21776039) and the Fundamental Research Funds for the Central Universities (DUT2018TB0)

Received Date: 2021-04-08
Rev Recd Date: 2021-05-10

Available Online: 2021-06-16

Publish Date: 2022-01-25

Abstract

Abstract

In this paper, two kinds of coal (Baiyinhua lignite and coal using in Ezhou Power Plant) were selected to study the occurrence of heavy metals including arsenic (As), selenium (Se) and lead (Pb) in coal and their release behaviors during the ashing process. The influence of ashing conditions on the mineral conversion was also examined by the combination with the changes of minerals in coal. The burn-out temperature of the coal was determined from the thermal weight loss curve by extrapolation method, and then the coal sample was ashed according to the National Standard Method of China. The obtained ash samples were characterized by XRD, XRF, and TG-DTG to analyze the change characteristics of coal minerals at different ashing temperatures. The content and occurrence of As, Se and Pb in coal samples were extracted by sequential chemical extraction method. The heavy metals in the ash sample were extracted by HNO₃ + HF, and the heavy metal content in the extract was detected by Inductively Coupled Plasma Mass Spectrometer (ICP-MS). The results show that the heavy metal in BYH coal is mainly As in the form of sulfide bound state, which leads to the increasing volatility of As with temperature easily. However, the heavy metal in EZ is mainly sulfide-bound Pb, which makes it easy to release with temperature. Se in coal mainly exists in the form of organic bound state and sulfide bound state. During coal ashing, kaolin is gradually dehydroxylated into metakaolin and finally converted into mullite; pyrite is oxidized to form hematite; gypsum is dehydrated to form anhydrite. The release rate of heavy metals is greatly affected by the combustion temperature during the ashing process. High content of heavy metals in the sulfide bound state results in high release rate with increasing the temperature.
- coal,
- heavy metal,
- sequential chemical extraction,
- ashing method,
- mineral

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References(26)

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