Experimental Study On Effect Of Pyrite On Low Temperature Oxidation Stage Of Coal

The phenomenon of spontaneous combustion of coal is prevalent in major coal-producing(?)ieS in the world.One of the important factors affecting coal spontaneous combustion is(?)in coal.Therefore,it is of great significance to study the influence of pyrite on coal(?)neous combustion.In this study,different pyrite content(the raw coal,2%,4%and 6%)ot coal were taken as study,object.Experimental analysis was adopted to studying the influence ot pyrite content on(?)fic surface area,micro structure,oxidation characteristics and thermal effect of coal.(?)gh the proximate analysis instrument and elemental analyzer,to determine the ingredient of coal and porosity were studied through the proximate analysis instrumen,t and elemental analyzer.The influence of pyrite content on the BET specific surface were studied through the(?)sica-chemical adsorption experiment.The influence of pyrite content on the index gas,(?)teristics temperature were studied through the programmed temperature experiment.The influence of pyrite content on the total heat release and activation energy heat release rate were studied through the C80 thermal analysis experiment,the conclusions show that the coal mined with 2%pyrite content has the strongest exothennicity.The influence of pyrite content on the functional groups were studied through the FTIR experiment,the conclusions sh,ow that thecoal mixed with 2%pyrite content has the strongest variable quantityof aliphatic(?)carbon and oxygen-containing functional groups.Comparing the experimental results,the relationship among oxidation characteristics,(?)enmic characteristics and major functional groups of coal can be obtained,and the enfluence of pyrite on the above three was analyzed.Finally,the influence of pyrite on the(?)eous combustion characteristics of coal was analyzed through two aspects:pyrite self-beat characteristics and the reaction products of pyrite.