Abstract
Pyrolysis technology is crucial for realizing waste bischofite resource utilization. However, previous studies overlooked the complexity of multistep pyrolysis, resulting in a lack of thorough knowledge of the pyrolysis behavior and kinetics. The pyrolysis products were characterized using XRD and FTIR to indicate the bischofite pyrolysis behavior. Additionally, the multistep kinetics was studied using the segmented single-step reaction (SSSR) and Fraser-Suzuki combined kinetic (FSCK) methods. The results show that the bischofite pyrolysis is divided into dehydration and hydrolysis. The former refers to removing crystalline water from MgCl2·nH2O (n = 4,6). At the same time, the latter is related to the removal of HCl, characterized by the strengthening of the Mg-O bond in the FTIR analysis and the emergence of MgOHCl·1.5H2O in the XRD examination. The two main stages are divided into three dehydration reactions (D-1, D-2, D-3) and three hydrolysis reactions (H-1, H-2, H-3) by DTG-DDTG or Fraser-Suzuki deconvolution. Compared with the SSSR method, the FSCK method has improved model repeatability for multistep kinetic parameters. Following Fraser-Suzuki deconvolution, the FSCK method creates almost the same activation energy results when using the Friedman (FR), Kissinger–Akahira–Sunose (KAS), and Vyazovkin (VZK). This work provides fundamental data to promote the maximizing waste bischofite resource utilization.
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This study was financially supported by the National Key R&D Program of China “Technologies and Integrated Application of Magnesite Waste Utilization for High-Valued Chemicals and Materials” (2020YFC1909303).
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Hanlu Xu: conceptualization, software, formal analysis, writing—original draft. Hui Dong: supervision, review, funding acquisitions. Liang Zhao: methodology, validation, review. DaoKuan Cheng: visualization, writing—reviewing and editing.
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Xu, H., Cheng, D., Zhao, L. et al. Exploring multistep bischofite waste pyrolysis: insights from advanced kinetic analysis and thermogravimetric techniques. Environ Sci Pollut Res 31, 13867–13882 (2024). https://doi.org/10.1007/s11356-024-32087-6
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DOI: https://doi.org/10.1007/s11356-024-32087-6