An Experimental Study on the Particle Size and Shape Distribution of Coal Drill Cuttings by Dynamic Image Analysis

Table 2

Statistical parameters of the PSD characteristics of 8 times repeated experiments with different masses (coal sample C1,  g~25 g).

Statistical parameters	Sample mass (g)	Mean diameter (μm)	Median diameter D50 (μm)	Sorting coefficient
Mean	5	1831.67	1778.78	1.63
	10	1833.66	1778.66	1.64
	15	1818.41	1749.28	1.67
	20	1822.96	1764.33	1.67
	25	1826.90	1754.92	1.65
Standard deviation	5	45.45	60.86	0.07
	10	42.14	59.41	0.03
	15	41.94	59.40	0.02
	20	41.54	56.30	0.02
	25	40.24	55.03	0.01
Relative standard deviation	5	0.02	0.03	0.04
	10	0.02	0.03	0.02
	15	0.02	0.03	0.01
	20	0.01	0.02	0.01
	25	0.01	0.02	0.01
Half-width of the confidence interval (95% confidence)	5	38.00	50.88	0.05
	10	33.56	52.17	0.02
	15	35.90	59.69	0.02
	20	33.83	54.49	0.02
	25	32.00	54.20	0.01