Research Institute of Comprehensive Exploitation of Mineral Resources – IPKON, Moscow, Russia

I. O. Krylov*, Candidate of Technical Sciences, Senior Research Scientist, krylov_i@ipkonran.ru
A. A. Lavrinenko, Doctor of Technical Sciences, Chief Researcher, Head of the Laboratory, lavrin_a@mail.ru
I. V. Kunilova, Candidate of Technical Sciences, Senior Research Scientist, kunilova_i@ipkonran.ru

* Corresponding author

The article highlights the effects of concentration of components of micro-admixtures of ash and slag from Kashirskaya GRES during electrical separation into a conductive, carbon-containing and (or) nonconductive, iron-aluminosilicate phase. It is shown that changing the electric field strength makes it possible to adjust the distribution of some components from the conductive to the non-conductive phase and vice versa, while increasing the concentration of others in the bound phase. The extraction of individual trace elements in the corresponding phase ranges from 60 % to 95 %, and the degree of concentration reaches 1.93. At a voltage of 20 kV, carbon concentrate is released into the conductors and Ca, S, Cu, Zn, Th will be concentrated into it, and K, Ti, Mn, Co, V, As, Sr, Y, Rb, Pb will go into nonconductors with an aluminum-iron-silicate product. The degree of concentration is almost It is observed twice for Sn (95 % extraction), As (91 % extraction), and Zn (92 % extraction). Pb (79 % extraction) and Cu (78 % extraction) are more than one and a half times concentrated, and S, V, Mn, Co, Rb, Y, and Zr (60–70 % extraction) are more than 30 % concentrated. The remaining impurities show an insignificant ability to concentrate in an electric field. In total, the content of impurities in conductors, without calcium, will be 1.61 %, and in nonconductors 2.28 %, which can be considered as a man-made material with a high content of non-ferrous, rare earth and ferrous metals.

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