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《Geochimica》 2007-01
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Microstructure and composition of inhalable particulate matter (PM_(10)) from coal-fired power plants in Southwest China

SUN Jun-min1*, WEN Mao2, LIU Hui-yong1, YAO Qiang1 and XU Xu-chang1 1.National Research Center of Clean Coal Combustion, Tsinghua University, Beijing 100084, China; 2. Inner Mongolia Station of Quality Inspection of Building Materials, Hohhot 010010, China  
The microstructure, mineral phase and chemical composition of inhalable particulate matter (PM_(10)) from three coal-fired power plants in Southwest China were studied by two types of scanning electron microscope (SEM), electron probe, X-ray diffraction (XRD) and inductively coupled plasma mass spectrometer (ICP-MS). The results indicate that the number of non-spherical particle increases with decreasing grain size of PM_(10). There are more solid spheres and less porous and hollow spheres in PM_(10) compared with original fly ash particles. The surface of PM_(10) is normally coated with a layer of ultra-fine particles. The main minerals of PM_(10) from Xiaolongtan power plant include quartz, lime, gypsum and hematite, but mullite and quartz are the main crystalline phases of PM_(10) from Guiyang power plant. Six types of single particle, namely, silicon, ferruginous, Ca-aluminosilicate, Fe-aluminosilicate, Ca-Fe-aluminosilicate and calcium sulfate were identified according to their chemical composition. From electrostatic precipitator (ESP) inlet to ESP, the main element contents of PM_(10) have little variety, however, the contents of Fe, Ca, Mg and Al decrease significantly and the content of Na increases markedly on ESP outlet.
【Fund】: 国家自然科学基金(40102013);; 国家重点基础研究发展计划项目(2002CB211600)
【CateGory Index】: X513
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