Journal article

Production of Ultra Clean Coal Part I - Dissolution behaviour of mineral matter in black coal toward hydrochloric and hydrofluoric acids

KM Steel, J Besida, TA O'Donnell, DG Wood

FUEL PROCESSING TECHNOLOGY | ELSEVIER SCIENCE BV | Published : 2001

Abstract

The mineral matter in an Australian black coal has been isolated using a low-temperature ashing (LTA) procedure. This LTA procedure is a modification of the Australian Standard for LTA at 370°C, and alleviates adverse effects to the minerals caused by the heat of combustion. The leaching behaviour of the mineral matter towards aqueous HCl and hydrofluoric acid (HF) is presented. HCl can dissolve simple compounds such as phosphates and carbonates, yet it cannot completely dissolve the clays. HF reacts with almost every mineral in the mineral matter, except pyrite, and most of the reaction products are water soluble. However, at HF concentrations greater than that required to dissolve the alum..

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University of Melbourne Researchers