The possibility of obtaining termografenit with magnetic properties from dispersed Fe-C metallurgical wastes

It is known that it is possible to obtain compounds of graphite intercalation by oxidative treatment of graphite, getting termografenit from them. All known methods are associated with the graphite extraction from Fe-C containing wastes and its further oxidation. Intercalation compounds of graphite are formed as a result of the introduction of atomic and molecular layers of different chemical particles between the layers of graphite plates. Termografenit is very light dispersed graphite, having a unique complex of thermal and electrical properties. This is of interest to further study the technology of making this material. In previous studies, graphite was obtained from dispersed Fe-C containing wastes of metallurgy, and then was subjected to processing. However, considering the special microstructure and the morphology of the dispersed Fe-C containing wastes, they can become a raw material for production the intercalation compounds of graphite first, and then magnetic termografenit. In the present work dispersed Fe-C containing wastes of desulphurization at PJSC «Azovstal» with up to C 60% were used. The result of this investigation is receiving a new product – graphite intercalation compounds with magnetic properties – as well as the technology of getting the compounds. The technological peculiarities, providing for remaining significant amount of the iron oxides of Fe-C wastes in the material that in the process of oxidative intercalation give the intercalation compounds of graphite with magnetic properties, were found. Subsequent thermal expansion of the intercalation compounds of graphite at 1000°C makes it possible to obtain termografenit with a bulk density of 6-10 kg/m3, the specific magnetization saturation being 12-24 A•m2/kg and the specific electrical resistance being (1,9-9,0)•10-4 Ohms•m