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THE POSSIBILITY OF SEPARATING AND UTILISING CHAR OBTAINED FROM FLY ASHES
Abstract
The publication presents an assessment of the possibility of obtaining char from fly and fluidised ashes from coal combustion. It also presents the methodology of measuring the concentration of char in fly ashes as well as the method developed for separating char grains from fly ash samples. The research conducted has shown that both fly and fluidised ashes contain large quantities of unburnt coal grains, which can be used as a substitute in obtaining artificial graphite through the processes of graphitisation. The char content in the tested samples of fly ashes was between 5 and 8%. Grain size distribution tests of the ashes have shown a clear size difference between the fly ash and the char. A significant increase in the concentration of char grains occurred in fractions above 0.2 mm. Sieving the grain classes makes it possible to separate char from the fly ash. The use of densitometric analysis did not allow for obtaining concentrates of char from fly ashes. The grains of the char present in ashes were irregular and porous in shape and composed mostly of pure carbon.
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