Table 1 Properties of coal sample in the opencast coal mine

Proximate analyses (air dried) %

Moisture

7.5

Volatile matter

32.05

Fixed carbon

53.68

Ultimate analysis vol. (dry ash free) %

Carbon

73.98

Hydrogen

4.09

Nitrogen

0.93

Sulfur

0.32

Oxygen

20.70

Petrographic analysis vol. %

Vitrinite

24.6

Liptinite

3.5

Inertinite

71.6

Mineral matter

0.8

Reflectance (Ro, max) %

0.31

Classification

Lignite