Effect of leachant concentration on mineral depletion in some Pakistani coals was studied varying the concentration of leachants i.e. Ammonium acetate, HCI, HNO) and HCI folIowed by HF folIowed by HC\. The extracts as welI as the residual coal samples were analyzed for inorganic elements i.e. Fe, K, Na and Ca+Mg (combined). Amongst the metals studied, Fe and Ca+Mg have been extracted significantly compared with the extraction of Na and K. Complete mineral depletion in any case was not achieved even when extraction was performed with high concentration of either of the leachants. Leachability of some metals has been found concentration dependent while other exhibited deviation.
I AHMAD ,M A KHAN ,M SHAKIR ULLAH ,M ISHAQ ,
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