Abstract:
The research results of the process of lisakovsky gravitational magnetic concentrate (LGMC) solid-phase
metallization using the highly reactive solid carbon reducing agent «direksil» are given in the article. There
were set rational parameters of solid-phase reduction process of LGMC in the mine furnace providing the extent
of its metallization of 20.4–88.6 %. It was determined the temperature range of solid-phase direct reduction
of iron of 1150–1200 ºC providing the maximum rate and extent of iron oxides metallization, at the same
time passing over emergence of the liquid phase — fusion. Use of «direksil» as a reducing agent allows raising
metallization extent of LGMC in more than 3 times in comparison with furnace coke. In the article there
are given diffraction patterns (X-ray patterns) of the metallized samples of LGMC characterizing phase structure
and crystal structure of the obtained restoration products depending on the type of reducing agent. The
physical condition of the metallization products obtained in the mode of solid-phase restoration allows using
all known methods of separation of the metallized concentrate from the dead rock. The most preferable option
of such separation includes methods of magnetic separation in view of contrast formed after the system metallization.
Separation of magnetic and non-magnetic products after metallization is an obligatory element of
the technological scheme of LGMC metallization since the total content of iron in initial concentrate does not
exceed 49 %. At that depending on metallization extent the magnetic fraction can be used as a furnace charge
component when smelting the conversion iron in the blast furnace (metallization extent is less than 40 %) or
steelmaking in the electric furnace (metallization extent is more than 80 %).
