CLEANING OF BEYŞEHİR (BAYAVŞAR) COAL IN TURKEY WITH HYDROPHOBIC FLOCCULATION USING WASTE MOTOR OIL

Abstract

In this study, the hydrophobic flocculation behavior of lignite coal obtained from Beyşehir region in Turkey and the effect of some parameters were investigated. These parameters were selected as pH, amount of dispersant, amount of binding liquid, flock growth time, stirring speed, flocculation time and solid ratio. The ash content (ash, %) and combustible recovery (CR, %) of the flocks obtained as a result of the experiments were determined. As a result of the studies, the optimum pH value (3), amount of sodium silicate (1 mL), amount of waste motor oil (3 mL), flock growth time (1 min), stirring speed (1250 rpm), flocculation time (2 min) and solid ratio (5 g) were determined. The hydrophobicity of fine coal grains was increased by using waste motor oil. According to the hydrophobic flocculation results of coal grains, flocks with 17.03% ash content and 99.06% combustion recovery were obtained. While the contact angle of the original coal was 44°, it was observed that the contact angle of the obtained flocks reached 117°. It was determined from experiments that the surfaces of the coal grains have a very high hydrophobicity. As a result, clean coal with a reduced ash content of 53.22% was obtained.