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value (CV) dropped from 31.5 to 29.5 MJ/kg, and the N content increased from 2.0 to 2.8 wt%, due to attack on the carbonaceous matrix during the HNO3 leach. Interestingly, this attack only occurs when HNO3 reacts with and dissolves pyrite, suggesting that it is the products of reaction between HNO3 and pyrite which react with the coal. It is proposed here that localized concentrations of sulphuric and nitric acids at the pyrite site may react to form the powerful nitrating agent NO3 + which then reacts with the carbonaceous coal matrix. The fluoride content of the coal increases from 80 to 3240 ppm after the HF leach, yet drops to 130 ppm following the HNO3 leach. The mineral matter remaining in the coal after the leaching sequence consists largely of Fe, which is most likely present as finely disseminated unreacted pyrite. Economics, business, marketing, policy 04101198 Peat/coal type and depositional environmentare they related? 04/01206 Curing temperature effect on smokeless fuel briquettes prepared with molasses and H3PO4

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Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0140-6701)

Published

2004

Language

EN

Field

Engineering (Physical Sciences)