Joint Institute for High Temperatures of the Russian Academy of Sciences (Russia):

Ryabov Yu. V., Senior Researcher, Ph. D. in Technical Sciences, Ryabov1938@yandex.ru

Delitsyn L. M., Head of Laboratory, Doctor of Geology and Mineralogy, delitzin@ihead.ras.ru

Vlasov A. S., Senior Researcher, Ph. D. in Technical Sciences

Borodina T. I., Senior Researcher, Ph. D. in Physics and Mathematics, borodina@ihead.ras.ru

The paper is concerned with the problem of recovering unburned carbon from Kashira Thermal Power Plant (TPP) fly ash. The challenge to deal with was to get aluminoslilicate complying with specifications for its thermal and chemical treatment along with carbon product that may be used as a heating plant fuel. The study of phase and mineral composition of Kashir TPP fly ash as well as screen analysis of the same showed that flotation is to be adopted as the principal means of carbon recovery. The results of kinetic flotation tests are given. It is demonstrated that almost complete recovery of carbon into carbon concentrate is possible. It is to be noted that flotation tailings represent a valuable product, the recovery percentage of aluminosilicate into it varying from 75 to 97.5 %. Mass content of carbon (which is detrimental for subsequent thermal and chemical treatment) in aluminosilicate can be reduced to 0.6%. When using a closed circuit flotation with rough flotation concentrate cleaning the mass content of carbon can be increased from 61,4 to 81,4 %. Flotation machines of «reactor—separator» type are recommended because of their retention time which is many times shorter as compared to conventional designs.

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