Table 2 Particle size analysis of lignite crushing dust cut by drum under different rotational speeds.

From: Research on the mechanism of coal wall fragmentation and dust production characteristics in the perspective of differentiated discrete elements

Dust particle size d (μm)

35 r/min cumulative mass ratio R (%)

50 r/min cumulative mass ratio R (%)

65 r/min cumulative mass ratio R (%)

80 r/min cumulative mass ratio R (%)

Below 1 μm

100

100

100

100

1–15 μm

99.78

99.72

99.51

99.43

15–30 μm

91.31

91.5

90.63

90.31

30 − 45 μm

75.17

75.67

74.85

74.42

45–60 μm

48.63

49.33

48.54

48.86

60–75 μm

31.11

32.08

31.66

31.93

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