Flotation of coal slurry is carried out on a mass scale in flotation machines. In the industrial practice the concentrate output and separation selectivity, which is expressed in ash content in a concentrate and in tailings (Sablik, 1980, 1998) decide about technical efficiency of the flotation process. Also the yield of fl ammable substance in the concentrate is the measure of efficiency of washing process (Sablik, 1980, 1998).It is possible to assess the flotation process and efficiency of the flotation machines by use of film flotation method (Lenartowicz, 2007a, 2007b; Lenartowicz & Sablik, 2006; Sablik & Lenartowicz, 2007). Use of the above mentioned method enables determining surface characteristics (surface tension of wetting, energetic nonhomogeneity of surface) of floating particles along entire flotation machine, a content of hydrophilic particles in products and a content of hydrophobic particles in tailings. The method enables to analyze flotation process in a selected impeller compartment of pneumo-mechanical flotation machine. Assessment of applied flotation technology and efficiency of given machine is also possible. Besides, it is possible to identify the factors, which cause that the machines operate properly or they operate without satisfactory results (Lenartowicz, 2007a; Sablik & Lenartowicz, 2007).The procedure in assessment of operation of pneumo-mechanical flotation machines with use of film flotation method as well as operation of IZ – 12 flotation machine that beneficiates flame-and-gaseous coal of 32.1 type was presented in the paper.
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