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The paper deals with a potential utilization of a laboratory device of a column flotation machine for the flotation of coal. The flotation tests, which were carried out in the laboratory of the Institute of Environmental Engineering at the Faculty of Mining and Geology of V\vSB-TU Ostrava, made use of samples of black coal slurries from Darkov Mine in the Ostrava-Karvin\'a District. The research was aimed to identify optimal condensation of the flotation pulp as well as the most efficient flotation time. The follo...