Investigating the optimum fineness of the coal grain in the Brown Coal Mine Kakanj in order to fully exploit its calorific value

Abstract

Coal processing at the Vrtlište open-cut mining operation aims to separate combustible from non-combustible components, achieving higher calorific value and reduced ash content. Research determined optimal coal grain size for the Brown Coal Mine Kakanj. The top-quality granulation is -40+35 mm with a calorific value of 16918 kJ/kg followed by -35+20 and -20+10 with a calorific value of 13035 kJ/kg and 13819 kJ/kg respectively. These granulations generated smallest ash amounts post-combustion and lowest moisture values.