Collected raw coal was crushed and grilled into samples with particle sizes of 0.25–0.38 mm, 0.15–0.18 mm, 0.109–0.12 mm, 0.08–0.096 mm, and < 0.075 mm. Some of the samples with particle sizes of 0.15–0.18 mm was heated in a muffle furnace at the temperatures of 50 °C, 100 °C, 150 °C, 200 °C, 250 °C, 300 °C, 350 °C, 400 °C, 450 °C, 500 °C, 550 °C, 600 °C, 650 °C, 700 °C, 750 °C, and 800 °C. Table Table11 shows the proximate and ultimate values of the coal. The ash was also analysed, as showed in Table Table22.

Proximate and ultimate values for the A5 coal seam.

Oxides in the ash residue of the coal sample.

The ash residue contained SiO2, Fe2O3, CaO, Al2O3, MgO, SO3, TiO2, Na2O and so on. The oxides in the ash residue of coal sample were divided into acidic and basic oxides. The acidic oxides included SiO2, Al2O3, TiO2, and the basic oxides included Fe2O3, Na2O, CaO, MgO and K2O. The amount of SiO2 (46.57%) was in the range of 45–60%, and SiO2 has a high ash fusibility, which will reduce the coal combustibility.

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