Effect of the quality indices of coal on its grindability

Purpose is to determine the effect of quality indices coal characterized by different degrees metamorphism as well petrographic and ultimate composition on values its grindability defined Protodyakonov Hardgrove methods. Methods. 14 samples being a part raw material base coking chemical enterprises Ukraine were studied. In terms samples, parameters technical, petrographic, analysis identified. GOST 21153.1-75 Rocks. Method determining strength coefficient ISO 5074:2015 Bituminous coal. Determination index used identify grindability. Graphical mathematical dependencies between (R0, Vdaf, Cdaf, Oddaf) (f HGI) developed. Findings. The obtained graphic obtained. It shown that dependence with (f) much lower (R2 = 0.550-0.716) than (HGI): R2 0.807-0.937. Originality. For first time, comparative measurements according methods have been performed. has identified value these are inversely proportional described second-order polynom. Practical implications. graphical mathematic can be predict operation crushing equipment for both individual one grade at coking-chemical heat-producing enterprises.