Abstract
A technology for dry beneficiation of fly ash generated at coal-fired electric heat and power plants has been developed. Several samples of fly ash from different coal-fired heat and power plants were studied. The studies of ash samples material composition showed, that unburned carbon content in the samples varied from 5 to 20 %. The main processing technique, used for ash beneficiation in the performed studies, combined magnetic and electrical separation of ash in vibrofluidized state, permitting to significantly increase the separation process throughput rate and selectivity. The studies of dry ash material composition and physical properties showed, that coal particles most commonly form aggregations with spheroidized magnetite-hematite, and are characterized by larger size in comparison with other particles of main mineral mass. In addition to that, fly ash is characterized by an extremely low bulk density and a unique conditional coefficient of internal friction, which is close to unity. On the basis of the above, a combination technology for processing heat and power plants fly ash has been developed, that includes magnetic and electrical separation in vibrofluidized state, providing for a stable production of marketable product with carbonaceous particles content within 3 %, that may be used as general-purpose binding material in construction industry.
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