47. Decreasing the caking property of coal by wet-milling

Abstract

We noticed that the CSN of coal decreased by wet milling. It was found that most effective factor of decreasing the CSN is oxidation of coal by oxygen disolved in water during wet milling. The CSN doesn't decrease in water without oxygen. A part of CSN decreasing is attributed the colloidal inorganic matter that separate from corse particle at milling. The CSN decreasing ratio is higher in low rank coal than in high rank coal, because the lower rank coal is more reactive.