煤显微组分对煤石墨化作用的影响

Influence of Coal Macerals on Graphitization

煤系石墨是在岩浆接触热变质及构造变质作用下形成的煤系非金属矿产。煤系石墨与晶质石墨相比,具有品位高、易开发的特点,将成为高技术产业和新能源领域的重要原材料。综合概述了煤石墨化作用模式、影响因素以及煤显微组分对煤石墨化的影响,分析了煤石墨化研究的主要问题和发展趋势。目前,煤的物理化学结构和煤系石墨的相关研究已取得了较为显著的进展,但煤石墨化作用机制仍存在许多问题亟待解决。大量的研究集中在煤石墨化的外部地质因素,如温度、压力和介质条件对煤石墨化的控制作用,而对煤显微组分在煤石墨化过程中的作用研究相对较少。由于镜质组、惰质组和壳质组的芳环缩合程度不同,各种显微组分具有不同的芳氢和侧链取代基,从而对煤中芳香结构的演化和纳米结构的形成产生差异影响,造成煤石墨化作用效果和作用机制的复杂性。因此,充分认识显微组分对煤石墨化作用的影响可能是揭示煤石墨化机制的重要途径之一。

Coaly graphite is a nonmetallic mineral in coal measures formed by magmatic thermal contact metamorphism and tectonic metamorphism.Compared with crystalline graphite,coal graphite has the characteristics of high grade and easy development.It will become an important raw material in high-tech industries and new energy fields in the future.By summarizing and analyzing the mode of coal graphitization,the influencing factors and the influence of coal macerals on coal graphitization were identified.The main problems and development trends in coal graphitization research were analyzed.At present,research on the physical and chemical structures of coal and coal graphite has made remarkable progress,although there are still many problems that need to be addressed in coal graphitization.Many studies have focused on the external geological factors of coal graphitization,such as temperature,pressure,and medium conditions,in the control of coal graphitization.The role of coal macerals in coal graphitization has been relatively less studied.There are different condensation degrees of aromatic rings or different aromatic hydrogen and side-chain substituent contents among vitrinite,inertinite,and exinite,which affect the evolution of aromatic structures and the formation of nanostructures in coal,thus causing complexity in the coal graphitization effect and mechanism.Therefore,a full understanding of the influence of macerals on coal graphitization may be an important way to reveal the mechanism of coal graphitization.