Gamma Irradiation of FeS2 in Coal as Studied by Mossbauer Spectroscopy
S.M.AMAMi1, M.A.Ahmed1, M.S.Eilld2 , and Y.S.Murayed 2 Phys. Dept. ,Faculty of Science, Al Fateh Univ., TRIPOLI- LIBYA 2 Phys. Dept., Material Science, Tajura Nuclear research center, Tripoli-Libya
Well characterized coal sample mined from North Sinai Egypt was identified by Mossbauer Spectroscopy. The chemical analysis of the as-received sample is given. The aromatically as deduced from its FTIR spectrum was found to be (Fa=0.51) dealing with rang reported in the literature for sub-bituminous coal. The analysis of its Mossbauer spectrum showed the presence of pyrite (FeS2) and Ferrous sulphate (FeSO4,nH2O) which is the weathered product of pyrite. Coal fraction (20g) has been subjected to sets of irradiation experiments using
Co source for different dwell time
(10 hrs – 130hrs) with constant dose rate 9.12 Gray/min. Whereas, the pyrite was found to be oxidized to Fe3+ in sulphate at 70 hrs – 90 hrs runs while it was reduced to Fe2+ in sulphate at 100 hrs – 130 hrs runs. The gamma irradiation as new method for coal desulphurization is discussed.