Metamorphism and deformation significantly affect the macromolecular structure of coal. In
this study, experiments were conducted using coal samples with different metamorphic …

The impacts of stress on the physical and optical properties of coals are well recognized,
while the influence on the chemical structure is seldom considered. In the light of …

Oil and gas products can be successfully obtained from low-rank coal using superheated
water vapor in situ pyrolysis technology, and investigating the pyrolysis properties of coal …

A systematic analysis on gas occurrence in geological structure zone is crucial to coalbed
gas exploitation, gas disaster prevention and outburst risk prediction. To study the …

In this study, we focus on a quantitative characterization of aromatic cluster evolution in
vitrinite-rich coal during coalification processes. By employing high-resolution transmission …

Along the western edge of the Bohemian Massif, SE Germany, graphitic carbon occurs in
metabasic rocks plus calcsilicates, metabiolites, and paragneisses (graphite I), in pegmatites …

Abstract Changes of coals properties due to weathering and its impact on the properties of
derived cokes were investigated. Four coking coals collected from Polish coal mines were …

Pyrite, a mineral that can cause potential environmental issues in coal mining, is commonly
found in coal seams around intrusions. In this paper, pyrites from the Yuandian Coal Mine …

煤在较长一段时间内仍会占据我国能源消费结构的主体地位. 随着煤炭的深部开发和开采,
势必会遇到更多的侵入体及受其影响的热变煤, 但相比于经历深成变质作用形成的煤 …

岩浆侵入煤系地层导致煤发生接触变质作用, 形成天然焦, 降低煤经济价值, 增加自燃和瓦斯突出
风险, 改变煤层气赋存条件, 还被认为是地史时期全球气候变化和生物绝灭的重要触发因素 …