ABSTRACT Demineralization of coal carried out using EDTA for different time and HF of varying
concentration. The residual coal from each treatment was characterized together with virgin
coal using Scanning Electron Microscopy and energy dispersive X-ray analysis (EDAX).
Micrograph and EDAX analysis of Virgin coal reveal the features lithophiles like aluminium,
silicates and calcium. The absence of the features corresponding inorganic elements in
residual samples is an indication of demineralization. An elemental analyzer was adopted to
analyze CHNS on virgin and residual coal sample. The current research compares the
leaching efficiency of a mild leachant and a strong leachant. The final analysis showed that
the coal under study was sub bituminous coal and leaching could improve the amount of
Cite this paper
B. Manoj, A. Kunjomana and K. Chandrasekharan, "Chemical Leaching of Low Rank Coal and its Characterization using SEM/EDAX and FTIR," Journal of Minerals and Materials Characterization and Engineering, Vol. 8 No. 10, 2009, pp. 821-832. doi: 10.4236/jmmce.2009.810071.
 Mohammad,Shakirullah., Imtia Ahmad., Mohammad Arsala Khan., Mohammad Ishaq.,
Habib ur Rehman, and Uzma Khan., 2006. “Leaching of Minerals in Degari Coal.”
Journal of Minerals & Material Characterization and Engineering, Vol.5, No. 2, pp.131-
Oztas,N. A., and Yurum, Y., 2000. “Pyrolysis of Turkish Zonguldak bituminous coal.
Part 1 Effect of mineral matter.” Fuel, Vol.79, pp.1221- 1227.
Qing-feng, XUE., and Sheng- gao, LU., 2008. “Microstructure of ferrospheres in fly
ashes: SEM, EDX and ESEM analysis”. J Zhejiang Univ Sci A, Vol.9 No. 11, pp. 1595-
Shakirullah, M., Ahmad, I., Ishaq, M., Rehman, H., Khan, U., and Ullah, H., 2006.
“Effective Chemical Leaching and Ash Depletion of low rank coal with EDTA and Citric
acid”. Jour.Chem.Soc.Pak, Vol. 28, No. 1, pp. 56-61.
Chin-min Cheng., 2005. “Leaching of Coal combustion products Field and Laboratory
studies.” PhD thesis, Ohio state University, pp. 110-181.
Wenfeng Wang., Yong Qin., Shuxun Sang., Bo Jiang., Yingming Zhu and Yinghai Guo.,
2007. “Sulphur variability and element geochemistry of the No.11 coal seam from the
Antaibao mining district, China.” Fuel, Vol.86, pp. 777-784.
Rubiera, F., Arenillas, A., Arias, B., Pis, J.J., Suarez-Ruiz, I., Steel, K.M., and Patrick,
J.W., 2003. “Combustion behavoiur of Ultra clean coal obtained by chemical
demineralization.” Fuel, Vol.82, pp. 2145-2151.
Tao Wu., Mei Gong., Ed Lester., Fuchen Wang., Zhijie Zhou and Zunbong Y., 2007.
“Characterization of residual carbon from entrained-bed coal water slurry gasifier” Fuel,
Vol.86, pp. 972-982.
Supaluknari S., Larkins F.P, Redlich P., Jackson W.R., 1998. “An FTIR Study of
Australian Coals: Characterization of Oxygen Functional Groups.” Fuel Proc. Technol.
Vol.19, pp. 123-140.
Rubiera, F., Arenillas, A., and Pevida, C.,2000. “Coal structure and reactivity changes
induced by chemical demineralization.” Fuel processing Technology, Vol.79, pp.273-
Venkatachalapathy, R., and Ramaswamy, K.,1991. “Infrared spectroscopic study of
Neyveli Lignite Samples from Mine Cut-1 and II.” Spectroscopy Letters, Vol. 24(6),
Starsinic M., Otake Yoshinobu., WalkerJr P L. and, Paul C painter., 1984.”Application
of FT-ir spectroscopy to the determination of COOH groups in coal.” Fuel, Vol. 63(7),
pp. 1002 -1007.