西藏昌都早石炭世10~#煤的煤质、煤岩和地球化学特征

Coal Quality,Petrology and Geochemical Features of Early Carboniferous Coal No.10 in Qamdo,Tibet

运用光学显微镜及显微光度计、X射线荧光光谱、冷原子吸收光谱、电感耦合等离子体质谱和煤质分析等技术方法,对西藏自治区昌都市马查拉煤矿早石炭世10#煤层进行了研究。结果显示,昌都早石炭世10#煤挥发份低(V_(daf)=8.64%),碳含量高(C_(daf)=90.2%),镜质组反射率高(R_(ran)=2.17%),灰分低(A_d=4.79%),硫分低(S_(t,d)=0.74%),发热量高(Q_(gr,d)=33.26 MJ/kg),镜质组含量高(镜质组总和为69.2%),镜质组分具有强烈的各向异性,常量元素氧化物含量中SiO_2和Al_2O_3占绝对优势(90.85%),微量元素除Pb富集、Be轻微富集外都接近或低于世界煤的平均值,潜在有害元素(As、Hg、F、Be、U等)含量低,是优质贫煤或无烟煤。

To use technical approaches of optical microscope,microphotometer,X-ray fluorescence spectrometry,cold atomic absorption spectrometry,inductively coupled plasma source mass spectrometry and coal quality analysis have carried out studies on the early Carboniferous coal No.10 in the Machala coalmine,Qamdo City,Tibet.The results have shown that the coal No.10 in the Qamdo area has low volatile matter（V_（daf）=8.64%）,high carbon content（C_（daf）=90.2%）,high vitrinite reflectance（R_（o,ran）=2.17%）,low ash（Ad=4.79%）,low sulfur（S_（t,d）=0.74%）,high calorific value（Q_（gr,d）=33.26 MJ/kg）,high vitrinite content（total vitrinite 69.2%） with strong anisotropy.In macroelement oxides,SiO_2 and Al_2O_3 are dominated（90.85%）;except Pb enriched and Be slightly enriched,all other microelements are near or lower than world coal average;content of potential harmful elements（As,Hg,F,Be and U etc.） is low.In summary,the coal is high quality meager coal or anthracite.