Flyash is an extremly heterogeneous particulate material. The morphology and composition of the particles depend on the burning technology and the coal type. Fractionated bulk analysis and individual particle analysis have to be applied to obtain relevant data on the particle formation procedure.Flyash was sampled in Hungary from 230 MW power station burning third class brown coal mixed with slag. Burning temperature was 1100-1200 C°. A JSM-840 SEM equipped with ORTEC energy dispersive spectrometer was used for morphological studies. Emitted x ray spectra of the particle were measured by adjusting beam settings manually. For automatic particle analysis a JSM-733 superprobe was used with TRACOR particle recognition and characterization (PRC) system. Accelerating voltage was set to 25 and 35 kV and current to 0,3-1.0 nA. In order to detect heavier element traces like As, Rb, Sr and Pb a 100 μm Mo foil was placed into the electron beam. As a result the irradiated area was 2mm in diameter.
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