Abstract:Coal fly ash contains several trace elements some of which are toxic such as As, Cr, Pb, etc. Coal ash also contains relatively high amounts of rare earth elements whose recovery from coal ash could be an alternate source for their supply. Although uranium and thorium are less chemically toxic than other constituent elements such as arsenic, questions have been raised concerning the possible risk from radiation. Hence, the concentration levels of all of these trace toxic elements in fly ash samples have to be … Show more
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