Results of a study to minimize the ash content in some Pakistani coals have been presented. Leaching of some coal samples with distilled water, hydrochloric acid, nibic acid and acid mixture has been performed for time duration of 0.5 hour and 2.0 hours. Effect of contact time was evaluated and extended time has been found to be effective for maximum leaching of Fe, Ca, Mg, Na, and K. Amongst the leachants employed, acid mixture proved more effective in removing significant amount of ash forming inorganic elements. Amongst the coals studied, inorganic elements were effectively leached from Shahrigh and Makarwal samples.


I AHMAD ,M ISHAQ ,M A KHAN ,M SHAKIRULLAH ,