chemical properties of coal
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Other properties, such as hardness, grindability, ash-fusion temperature, and free-swelling index (a visual measurement of the amount of swelling that occurs when a coal sample is heated in a covered crucible), may affect coal mining and preparation, as well as the way in which a coal is used.
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Sinjai coal: moisture content: 10.09%, ash: 52.41%, volatile matter: 23.54%, fixed carbon: 13.96%, carbon content: 24.37%, sulfur content: 0.272% and calorific value: 3941.21 cal/gram
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