Abstract
Fine grinding of lignite in a ball mill was shown to be non-linear in rate because of the presence of both weaker and stronger organic phases. Weaker phases were ground rapidly, whereas stronger phases were ground more slowly. Lignite grinding was modeled by evaluating two sets of time-independent linear breakage rate constants, one for the weaker phases and one for the stronger phases. The time of transition when the comminution rate became controlled by the stronger phases rather than the weaker phases was determined by observing changes in gas release rate and particle properties such as composition, shape, and porosity.
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