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| Characteristics of Microcrystalline Structure Evolution and Inorganic Mineral Components of Coals With Different Metamorphic Degrees |
| JIA Jin-zhang1, 2, XING Ying-huan1, 2* |
1. College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China
2. Key Laboratory of Mine Power Disaster and Prevention of Ministry of Education, Liaoning Technical University, Huludao 125105, China
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Abstract To investigate the microcrystalline structural evolution characteristics and relative inorganic mineral content of coal at different metamorphic stages, this study characterized four coal samples with varying degrees of metamorphism using X-ray diffraction (XRD) experiments. Phase analysis and microcrystalline structural parameter calculations were performed. Building upon previous research, the evolution patterns of microcrystalline structural parameters in whole coal ranks were examined, and the evolutionary mechanisms of coal microcrystalline structures were explored. Research indicates that the microcrystalline structure parameters of coal exhibit nonlinear step changes with the reflectance of vitrinite. The fundamental structural units of coal gradually transform from “vortex-layered” to flat graphitic structures, undergoing a transition from gradual to abrupt changes. Ro, max ranges from 0% to 0.6%, during which the microcrystalline structure parameters of coal remain nearly constant, and coal rank evolution proceeds relatively slowly. Ro, max ranges from 0.6% to 1.3%. A rapid evolution phase commences, characterized by the swift detachment of aliphatic and oxygen-containing functional groups, which form numerous active sites and increase the probability of aromatization. Ro, maxranges from 1.3% to 2.4%; the development of coal ductility and stacking height lags behind the interplanar spacing. Ro, max that ranges from 2.4% to 3.3%, longitudinal development and growth essentially cease, and the graphite-like microcrystals in coal transform from “tall and slender” to “flat”. When Ro, max exceeds 3.3%, graphite content gradually increases, and the coal exhibits an aggregate of disordered aromatic carbon coexisting with ordered graphite microcrystals.
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Received: 2025-04-16
Accepted: 2025-09-09
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Corresponding Authors:
XING Ying-huan
E-mail: 1436529185@qq.com
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