Coal – any coal, including sized grades, small coal, coal duff, coal slurry or anthracite.
Coal duff – coal with an upper size of 7 mm.
Coal slurry – coal with particles generally under 1 mm in size.
Coke – solid residue from the distillation of coal or petroleum.
Small coal – sufficient particle material below 7 mm to exhibit a flow state when saturated with water.
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