Hardgrove Grindability of Coal. Part 1. Correlations with Composition, Structure, and Properties

The correlations of the composition, structure, and properties of coal from Ukraine, Russia, Canada, Australia, the Czech Republic, Poland, and Indonesia with its Hardgrove grindability index are investigated. It is found that the Hardgrove grindability increases with increase in total carbon content C daf and aromatic carbon content C ar , as well as the unsaturation δ of the structure. Correspondingly, the Hardgrove grindability decreases with increase in the volatile matter and decrease in the vitrinite reflection coefficient due to increase in the aliphatic carbon content and also with decrease in unsaturation of the coal’s organic mass. The Hardgrove grindability is calculated for unoxidized (reduced) coking coal of different types (corresponding to Ukrainian State Standard DSTU 3472:2015).