Microwave　radiation　can　produce　various　thermal　and　non-thermal　effects　on　coal　particles.　Microwave-induced　plasma　is　one　of　the　phenomena　of　microwave　non-thermal　effects.　However,　the　microwave-induced　plasma　mechanism　of　coal　particles　is　still　unclear　in　previous　studies.　Moreover,　the　effect　of　mineral　composition　in　coal　and　the　irregularity　of　mineral　shape　on　microwave-induced　plasma　has　been　ignored.　The　effect　of　mineral　components,　particle　size,　spacing,　particle　angle,　particle　shape　and　graphitization　degree　on　microwave　induced　plasma　was　studied.　It　was　found　that　different　components　of　coal　particles　have　significant　variations　in　the　intensity　of　microwave　discharge　due　to　their　own　dielectric　properties.　The　electron　density　of　the　coal　matrix　combination　weaker　than　that　of　the　pyrite　combination　by　1　∼　2　orders　of　magnitude.　When　other　particles　are　combined　with　pyrite　particles,　the　plasma　distribution　is　lopsided　and　biased　to　pyrite　particles.　As　the　particle　size　increases,　the　time　required　to　reach　the　maximum　electron　density　decreases,　making　the　discharge　process　easier.　When　the　particle　spacing　is　smaller　than　20　μm,　plasma　is　generated　at　both　ends　of　the　particles.　However,　as　the　spacing　increases,　plasma　is　generated　between　the　particles,　resulting　in　a　decrease　in　electron　density.　Moreover,　the　electric　field　between　the　particles　gradually　weakens　with　the　angle　increasing.　The　microwave　discharge　is　weakest　when　the　angle　increases　to　90°.　The　electric　field　strengthening　effect　of　irregular　coal　particles　is　directly　related　to　the　value　of　particle　curvature.　In　addition,　the　carbonaceous　materials　with　high　graphitization　degree　can　promote　more　significant　discharge　effect.　©　2024