Regularities of Lead Migration During Low-Rank Coal Pyrolysis

DOI

10.2991/978-94-6463-902-5_45How to use a DOI?

Keywords

low-rank coal; pyrolysis; lead; migration and release; occurrence forms

Abstract

Understanding the migration of lead during coal utilization is crucial for mitigating heavy metal pollution and safeguarding ecological security. In this study, thermogravimetric analysis, sequential chemical extraction, and fixed-bed pyrolysis experiments were employed to systematically investigate the occurrence characteristics and pyrolysis-induced migration of lead in Naomao Lake coal (NMH). Through comparative experiments on raw and demineralized samples, this study elucidated the dynamic release behavior of lead bound to aluminosilicates, organic matter, and sulfides within the 400–800℃ pyrolysis range, and further revealed their synergistic mechanism. The results demonstrate that the lead release ratio increases markedly with rising temperature, reaching 13.75% at 500℃ and up to 43.21% at 800℃. The release behavior is primarily governed by occurrence modes: at low temperatures, organic-bound lead volatilizes with devolatilization, whereas at high temperatures, silicoaluminate- and sulfide-bound lead are liberated through synergistic effects of mineral phase transformation and organic matter cracking, exhibiting distinct release kinetics. These findings provide essential theoretical insights for optimizing coal pyrolysis processes, developing predictive models of heavy metal release, and advancing the clean and efficient utilization of coal.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Shuqiang Jin
PY  - 2025
DA  - 2025/12/16
TI  - Regularities of Lead Migration During Low-Rank Coal Pyrolysis
BT  - Proceedings of the 2025 7th International Conference on Civil Engineering, Environment Resources and Energy Materials (CCESEM 2025)
PB  - Atlantis Press
SP  - 463
EP  - 472
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-902-5_45
DO  - 10.2991/978-94-6463-902-5_45
ID  - Jin2025
ER  -