Wang Lipeng, Qiu Tian, Guo Zhimin, Shen Xiaofeng, Yang Jianguo, Wang Yuling
National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China.
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
ACS Omega. 2020 Dec 24;6(1):180-187. doi: 10.1021/acsomega.0c04120. eCollection 2021 Jan 12.
It is unclear that the changes and migration of coal-derived minerals on the graphitization process of coal. The Taixi anthracite is the study sample of the changes and migration mechanisms of coal-derived minerals during graphitization. Raw coal and different temperature-treated products were collected and analyzed by X-ray diffraction (XRD) to reflect the variation trends of the crystal structure and functional groups with temperature. To analyze the microstructure and mineral composition of the samples in experimental and industrial ultrahigh-temperature graphitization furnaces, a series of experiments were performed using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS). The results showed that temperature played a crucial role in the changes and migration of minerals during the graphitization of anthracite. As the temperature rose, cracks appeared from the surface to the inside of anthracite and minerals gradually changed and migrated from the inside of the anthracite to the cracks in the form of gas or liquid. At ultrahigh temperatures, only a small amount of silicon remains in the system as a catalyst, and most of the elements escaped in the form of oxides.
目前尚不清楚煤中矿物质的变化和迁移对煤石墨化过程的影响。太西无烟煤是研究煤中矿物质在石墨化过程中变化和迁移机制的样本。采集原煤和不同温度处理后的产物，通过X射线衍射（XRD）进行分析，以反映晶体结构和官能团随温度的变化趋势。为了分析实验和工业超高温石墨化炉中样品的微观结构和矿物组成，使用X射线光电子能谱（XPS）和扫描电子显微镜-能量色散X射线光谱（SEM-EDS）进行了一系列实验。结果表明，温度在无烟煤石墨化过程中矿物质的变化和迁移中起着关键作用。随着温度升高，无烟煤从表面到内部出现裂纹，矿物质逐渐以气体或液体的形式从无烟煤内部向裂纹处变化和迁移。在超高温下，系统中仅残留少量硅作为催化剂，大多数元素以氧化物的形式逸出。
