Table 7. Calculation Table of Distribution Rates for −6 + 3 mm Lignite.

		sink–float product					distribution rate
density (g/cm3)	mean density (g/cm3)	gangue (%)	middling (%)	fine coal (%)	raw coal (%)	fine coal and middling (%)	high-density separation (%)	low-density separation (%)
–1.30	1.25	0.36	7.02	32.12	39.50	39.14	0.91	17.94
1.30–1.40	1.35	0.32	8.05	8.16	16.53	16.21	1.94	49.66
1.40–1.50	1.45	0.12	2.05	1.21	3.38	3.26	3.55	62.88
1.50–1.60	1.55	1.27	1.06	0.30	2.63	1.36	48.29	77.94
1.60–1.80	1.65	0.55	0.20	0.05	0.80	0.25	68.75	80.00
1.80–2.00	1.90	6.25	1.56	0.10	7.91	1.66	79.01	93.98
+2.00	2.10	25.69	3.45	0.11	29.25	3.56	87.83	96.91
total		34.56	23.39	42.05	100.00	65.44