Relation between Fieness and combustibility of coal

Abstract

(1) Combustibility of coal increases parallel to fineness until 95% minus 4900 mesh or 60-72% minus 16900 mesh.
(2) Ignition point is independent to the fineness.
(3) Weight of coal increases near 2000.
(4) Mixed coal does not ignites at the same time but each coal in the mixed ignites independent to another.
The coals used in this test are as follows.
Miike (bituminous coal)
Okinoyama Itsudan (brown coal)
Sanchoku (anthracite)
Kogen (anthracite)
Ryuto (anthracite)