Determination of Heating Value of Estonian Oil Shale by Laser-Induced Breakdown Spectroscopy

Table 1

Composition of dry samples.

Sample number	1	2	3	4	5	6	7	8	9	10
Heating value by bomb, Q^b (MJ/kg)	6.36	6.60	7.28	7.98	9.10	9.08	9.86	10.36	10.78	11.62
Analytical moisture (%)	0.6	0.6	0.7	0.7	0.8	0.8	0.8	0.8	0.8	0.8
C (%)	22.4	22.3	23.4	24.3	26.4	26.4	27.2	27.8	29.5	30.9
C inorganic (%)	7.2	7.2	6.9	6.6	6.1	6.3	5.6	5.1	5.8	5.6
C organic (%)	15.2	15.1	16.5	17.7	20.3	20.1	21.6	22.7	23.7	25.3
S (%)	1.0	1.2	1.2	1.3	1.4	1.4	1.3	1.5	1.2	1.3
N (%)	0.07	0.07	0.07	0.08	0.08	0.08	0.09	0.1	0.09	0.09
H (%)	1.9	1.9	2.1	2.2	2.6	2.6	2.7	3.0	2.9	3.0
Fe2O3 (%)	2.0	1.9	2.1	2.2	2.3	2.5	2.2	2.5	2.1	1.9
SiO2 (%)	11.2	10.1	10.8	11.1	13.0	13.3	15.9	16.6	12.7	12.2
MgO (%)	3.2	3.1	2.1	3.0	3.2	3.5	2.8	2.7	2.8	2.7
CaO (%)	32.9	32.1	31.2	26.4	27.7	32.1	26.6	22.7	31.6	30.4
K2O (%)	1.5	2.2	2.2	3.8	3.6	1.7	1.7	1.4	2.9	1.4
Al2O3 (%)	1.9	2.4	3.6	3.7	3.5	3.0	2.6	2.9	3.4	2.4
Na2O (%)	4.4	5.4	8.6	8.2	4.3	5.6	1.7	2.5	7.9	5.7