Coal recovery from coal washing plant tailings with Knelson concentrator

Abstract

ABSTRACT Due to the increasing technology, the energy requirement is also increasing, this situation causes rapid depletion of our underground resources. In such a case, the efficiency of coal washing plants should be increased. In addition, coal waste should be enriched and brought to the economy. In this study, the enrichment of slime coal waste at the Koyunağılı coal washing plant had been examined. These wastes had 61.7% ash and 1740 kcal/kg LHV (Lower Heating Value) on dry basis. Experimental design methods were used in the study. The aim of the first phase of the study was to obtain coarse-size coal with 0.5 mm sieving. Coal was obtained with an ash content of 31.20% and ash of 3,980 kcal/kg LHV. The second aim was to enrich of −0,5 mm particle size with the Knelson Concentrator and a fine coal containing 2210 kcal/kg LHV with 55.89% ash content was obtained with 67.81% combustion recovery. In addition, 81.61% combustible recovery was obtained when two products were evaluated together. Thus, as a result of two-step enrichment, 45.61% ash and 2947 kcal/kg of calorific value of fine powder coal were obtained.