摘要
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℃–800℃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 different 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.
对在氮气气氛下加热的天然黄铁矿样品的矿物的相变过程进行了系统的太赫兹光谱研究,并对在400℃-800℃温度范围内的黄铁矿热解过程进行了分析和讨论。本文基于X射线衍射(XRD)和热重分析(TG-DTG)对黄铁矿、磁黄铁矿和硫铁矿相应的热转化序列进行了分析。采用太赫兹时域光谱法表征了热解产物的光学特征。结果表明,黄铁矿、磁黄铁矿和硫铁矿在太赫兹带内表现出不同的吸收系数和折射率。这些热解产物的不同光学性质为探索黄铁矿的热解过程和了解环境中沉积物的磁性特性提供了一种新的途径。
基金
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).
