Investigation on Effect of Raw Coal's Granularity on Pore Structure and Adsorption Properties of Carbonized Material
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摘要: 以低灰分宁夏无烟煤为原料,采用箱式电阻炉制备炭化料,通过扫描电子显微镜(SEM)和X射线衍射仪(XRD)对炭化料的微观结构和物相组成进行表征;并通过炭化料的亚甲基蓝吸附值来评价原煤粒径对炭化料吸附性能的影响;采用N2吸附法对炭化料的孔结构进行表征.结果表明,粒径在0.2~0.3 mm范围内的宁夏无烟煤经5%/min升温至550℃并保温2h制备得到的炭化料含有许多石墨微晶,这些微晶作为碳骨架构成炭化料的孔结构,且中孔和微孔分布均匀.随着原料煤粒径的减小,炭化料的比表面积和微孔比例增大,总孔容减小.Abstract: The low ash anthracite from Ningxia was heated by box-type resistance furnace to prepare carbonized material.Microstructure and phase of carbonized material were characterized by scanning electron microscope (SEM) and X-ray diffractometer(XRD).The effects of raw coal's granularity on adsorption properties and pore distribution of carbonized material were studied by testing its methylene blue adsorption value and N2 adsorption.The results show that the carbonized materials,which were prepared with 0.2 ~0.3 mm raw coal at 5 ℃/min heating to 550 ℃ for 2 h,have many graphite crystallites which form pore structure as carbon-skeleton.The pores and holes distributed equably in carbonized material.As the granularity of raw coal decreased,the surface area and micropore of carbonized material increased,but total pore volume decreased.
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