1. School of Science, China University of Geosciences (Beijing), Beijing 100083, China
2. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
Abstract A systematic terahertz spectroscopy study of the mineral phase transformation process of natural pyrite samples heated in a nitrogen atmosphere is conducted. In addition, the pyrolysis process of pyrite in the 400 °C–800 °C temperature range is analyzed and discussed. This study is based on X-ray diffraction (XRD) and thermogravimetric–derivative thermogravimetric (TG-DTG) analysis of the corresponding thermal transformation sequences of pyrite, magnetopyrite, and sulfurous pyrite as the desulfurization process proceeds. Terahertz time-domain spectroscopy is employed to characterize the optical properties of the pyrolysis products. The results show that pyrite, magnetopyrite and sulfurous pyrite exhibit diff erent absorption coefficients and refractive indices in the terahertz frequency band. The different optical properties of these products provide useful information for the investigation of the pyrolysis process of pyrite and the magnetic properties of environmental sediments.
Fund: This research is sponsored jointly by the National Natural Science Foundation of China (61805214), Open Fund of State Key Laboratory of Infrared Physics (SITP-NLIST-YB-2022-12), Piesat Information Technology remote sensing interdisciplinary research project (HTHT202202), the Fundamental Research Funds for the Central Universities (2-9-2022-203). Young Elite Scientists Sponsorship Program by Bast (BYESS2020037).
About author: Zhang Tong is a PhD student at China University of Geosciences (Beijing). She graduated from Tianjin University of Technology and received a Bachelor’s degree in 2019 and received her Master’s degree from China University of Geosciences (Beijing) in 2022. Her primary research focus is on solving geologic phenomena using terahertz spectroscopy.
Cite this article:
. Characterization of pyrolytic properties of pyrite in the terahertz frequency band[J]. APPLIED GEOPHYSICS, 2025, 22(4): 1351-1358.
2025, Vol. 22 
