Characterisation of Fly Ash from Coal-Fired Thermal Power Plants using Energy Dispersive X-Ray Fluorescence Spectrometry

Author(s): M. Malik, N. K. Soni, K. V. Kanagasabapathy, M. V. R. Prasad and K. K. Satpathy

Fly ash composition is useful in predicting slagging and fouling characteristics of combusted materials as well as the potential utilization of ash by-products. The ash composition analysis can also be helpful in developing a pollution abatement approach for various applications of fly ash such as cement and ceramics manufacturing. The current study deals with the characterisation of fly ash samples collected from different NTPC units in India for eleven major oxides (Na2O, MnO, SO3, P2O5, MgO, K2O, TiO2, CaO, Fe2O3, Al2O3 and SiO2) and eleven trace elements (As, Co, Pb, Ni, La, Cu, Zn, Cr, V, Sr and Ba) by non-destructive technique, ED-XRF. Procedure developed was validated using NIST certified coal ash reference materials. Among the major elements, the concentration of SiO2 is found to be the highest in the range of 51.36- 58.5% and that of Na2O is found to be the lowest in the range of 0.02-0.17%. Among the trace analytes, Ba content is found to be the highest in the range of 126.6-1393.5 ppm and As is found to be the lowest concentration in the range of 24.8-37.4 ppm, respectively. The study reveals that all the fly ash samples were of siliceous type as per IS: 3812.

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