Abstract
Thermal analysis-mass spectrometry (TA-m.s.) has been used to study the reactions of coals and coal minerals under combustion-related conditions. The TA-m.s. profiles of the coals give information on combustion performance (ignition, peak combustion and burnout temperatures), and on chemical changes to the volatile matter, char and minerals. The TA-m.s. profiles of low temperature ashes (LTA) are extremely complex, and show significant differences between coals. They may be interpreted in terms of mineral decomposition reactions (carbonates, sulphates, pyrite and clays). Comparison with the corresponding density-separated mineral matter has provided evidence for the fixation of sulphur during the plasma ashing of certain alkali-rich coals. Fourier transform infrared (FT-i.r.) and 27Al magic angle spinning-nuclear magnetic resonance (MAS n.m.r.) spectroscopy have also identified differences in clay mineral distribution, and the LTA cannot therefore be regarded as unaltered mineral matter.
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