Effect of particle size on re-crushing characteristics of crushed coal ...
1. Introduction. An increasing number of mining gobs are formed as underground coal resources continue to be mined [].Caved, fractured, continuous bending, and soil zones may be identified in response to longwall mining [2,3].Caved zones have been identified as porous media comprising crushed rock and coal of different particle sizes [].As the working face …
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Fig. 3. Microscopic observation images of fine coal particles below 0.075 mm diameter produced by crushing specimens through sudden release of high pressure gas. The shape of these coal particles in Fig. 3 is almost the same as that of coal particles shown in Fig. 2, i.e., mostly spherical or ellipsoidal. 3.3.
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