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. 2021 Jan 12;11:547. doi: 10.1038/s41598-020-79510-9

Table 2.

Ash composition of the raw coal and bio-coal briquettes.

Samples	Ash compositions
Samples	SiO₂ (%)	Al₂O₃ (%)	Fe₂O₃ (%)	K₂O (%)	MgO (%)	CaO (%)	Na₂O (%)	TiO₂ (%)	ZnO (ppm)	CuO (ppm)
Rawcoal	58.00	19.97	8.26	2.04	2.07	2.56	0.21	1.26	0.02	0.01
Bio-coal briquette (97:3)
Binder ratios
5P-5 M	58.30	19.72	8.41	2.19	2.08	2.4	0.23	1.59	0.02	0.01
8P-7 M	58.50	20.53	8.61	2.21	1.83	2.74	0.21	1.62	0.02	0.01
10P-5 M	57.60	19.08	8.67	2.43	1.92	2.95	0.22	1.61	0.02	0.01
5P-10 M	58.00	19.83	8.29	2.24	2.00	2.64	0.21	1.59	0.02	0.01
Bio-coal briquette (95:5)
Binder ratios
5P-5 M	57.50	19.82	8.35	2.14	2.06	2.6	0.21	1.62	0.02	0.01
8P-7 M	57.36	19.86	8.32	2.14	2.01	2.81	0.22	1.61	0.02	0.01
10P-5 M	58.21	19.90	8.35	2.07	2.09	2.81	0.22	1.59	0.02	0.01
5P-10 M	58.24	20.50	8.42	2.07	2.03	2.82	0.22	1.56	0.02	0.01
Bio-coal briquette (90:10)
Binder ratios
5P-5 M	58.32	19.63	8.25	2.01	2.06	2.78	0.21	1.63	0.02	0.01
8P-7 M	58.86	19.76	8.22	2.14	2.01	2.67	0.20	1.61	0.02	0.01
10P-5 M	58.21	19.90	8.30	2.16	2.1	2.61	0.20	1.60	0.02	0.01
5P-10 M	58.24	19.80	8.32	2.09	2.03	2.66	0.21	1.54	0.02	0.01