Enrichment to Improve Poor-Quality Coal

Abstract

Methods and conditions are outlined for improving Kemerovo coal from the Kuznetsk Basin, which is of little value for coking. The basic methods employed are gravitational fractional separation of dust samples (0.2–3.0 mm) in liquids of different density; and flotational enrichment of coal fines (<0.2 mm). Such operations permit considerable improvement of regular coal, with increase in the content of clinkering vitrinite components and considerable decrease in calcium-oxide content in the ash. The required values are obtained for the basicity index of the ash, the reactivity (CRI) of the coke, and its strength after reaction with CO₂ (CSR). The coal’s rank is increased, reflecting its greater suitability for coking.