Table 2 The particle size range and numbers for the coal samples.

From: The variations in the spontaneous combustion characteristics of coal during primary and secondary oxidation under varying particle sizes

Coal samples

Particle sizes

Primary oxidation

Secondary oxidation

1#

0.5 mm

P-1#

S-1#

2#

1 mm

P-2#

S-2#

3#

2.36 mm

P-3#

S-3#

4#

5–10 mm

P-4#

S-4#

5#

Mixed

P-5#

S-5#

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