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Strain-Induced Graphitization Mechanism of Coal-Based Graphite from Lutang, Hunan Province, China

College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
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Minerals 2019, 9(10), 617; https://doi.org/10.3390/min9100617
Received: 3 September 2019 / Revised: 30 September 2019 / Accepted: 6 October 2019 / Published: 8 October 2019
(This article belongs to the Section Mineral Deposits)
Anthracite and coal-based graphite (CBG) samples were collected at varying distances from a granite intrusion. Optical microscopy, X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM) were used to characterize the structural evolution of CBG at different scales. The results indicated differences in the graphitization rates of coal macerals and crystallization degree of different graphite-like particles. Differentiated graphitization of coal was caused by deformation, which led to the discontinuous distribution of CBG. This indicates that samples located at the same distance from the intrusion were graphitized to different degrees or that CBG with a similar graphitization degree occurred at varying distances from the intrusion. A possible mechanism for graphitization is strain-induced graphitization, where the local stress concentration leads to preferred orientations of the basic structure units (BSUs), as well as the motion and rearrangement of structural defects, resulting in the formation of a locally ordered structure. The graphitization degree is enhanced as the local graphite structure spreads. View Full-Text
Keywords: coal-based graphite; strain-induced graphitization; Lutang mining area coal-based graphite; strain-induced graphitization; Lutang mining area
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Wang, L.; Cao, D.; Peng, Y.; Ding, Z.; Li, Y. Strain-Induced Graphitization Mechanism of Coal-Based Graphite from Lutang, Hunan Province, China. Minerals 2019, 9, 617.

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