Abstract
Minerals in coal have been studied in some detail, but very little work has been done on the behavior of minerals in the course of heat treatment in air, that is, when coal is burned at high temperatures.In this study, the samples of mineral matter of f our Japanese coals were prepared by a low-temperature ashing technique by which the mineral matter from coal can be obtained in a relatively unaltered state.The low-temperature ash samples were then heated progressively from 400-130°C at 100°C intervals. Min-eral phases at each temperature interval were determined by X-ray dif fraction analysis.
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