Recovering of fine coal particles from tailing ponds of TKI Alpagut-Dodurga coal washing plant

Abstract

In this work, samples from tailing ponds of TKI Alpagut-Dodurga Lignites Company Coal Washery were subjected to extensive research to recover clean fine coal particles, by means of gravity methods. The optimum conditions of separation were determined under the laboratory conditions by using shaking tables and Multi-Gravity Separator. Several parameters, thought to be effective on the separation were tested. After the shaking table experiments clean coal products, containing 13.52 % ash with 50.16 % combustible recovery and 16.78 % ash with 53.12 % combustible recovery were obtained at -3.0+0.6 and -0.6+0.3 mm fractions, respectively. After the investigations carried out by Multi-Gravity Separator, clean coal fractions, containing 20.53 % ash with 83.94 % combustible recovery and 25.58 % ash with 88.39 % combustible recovery were obtained at -0.3+0.15 and -0.15+0.05 mm fractions, respectively. Cleaning stage experiments were conducted on the -0.15+0.05 mm fraction and ash percentage of the clean coal was reduced down to 17.39 % with 63.08 % combustible recovery according to head sample.