REC «Mekhanobr-tekhnika» (Russia):

Arsentyev V. A., Doctor of Engineering Sciences, Research and Development Directo
Dmitriev S. V., Chief Specialist
Mezenin A. O., Ph. D. in Engineering Sciences, Leading Specialist

E-mail (common): gornyi@mtspb.com

National Mineral Resources University (University of Mines) (Russia):
Kotova E. L., Ph. D. in Geology and Mineralogy, Leading Specialist, satellite24@ya.ru

A principally new combination technology for processing fly ash from combined heat and power plants, that includes dry size classification, combination of dry magnetic and electrical separation in pseudofluidized layer, permitting to obtain final product as mineral fraction with coal particles content below 3 % that may be used as a general-purpose binding material in construction industry, is described. In order to develop this technology, material composition of ashes from different coal-fired heat and power plants: the Southern Kuzbass, Tom-Usinsk and Apatity, was studied. By means of microscopic studies, through quantitative and qualitative assessment, products obtained in processing of these ashes, were studied in details. The following types of crystalline and amorphous ash particles were revealed: unburnt coal particles, white spheroidized, red spheroidized, spheroidized magnetite-hematite, agglomerated fine particles of glassed silica, agglomerated particles of complex composition. 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. It was revealed, that in addition to the above mentioned special features, fly ash is characterized by an extremely low bulk density and a unique conditional coefficient of internal friction, which is close to unity.

The work was performed with the financial aid from the Ministry of Education and Science of the Russian Federation, the Government Agreement No. 14.579.21.0023. UIPNI RFMEFI57914X0023.

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