ОСОБЕННОСТИ ПОВЕДЕНИЯ МАГНЕТИТОВЫХ РУД КОВДОРСКОГО МЕСТОРОЖДЕНИЯ В АГЛОПРОЦЕССЕ

The peculiarity of Kovdor deposit ores is the presence of magnetite of heterogeneous structure when the isomorphic impurities present in celonite matrix as separate spinel phases: FeAl 2 O 4 , MgFe 2 O 4 , TiFe 2 O 4 . The authors have investigated the process of phase transformations of magnetite crystals of heterogeneous structure in conditions close to sinter. In the range of 1100 – 1300 °C in reducing environment occurs the dissolution of magnetite crystals in two oxide phases: magnetite and wustite with redistribution of isomorphic impurities between them. At the same time the silicates with high melting points are formed in the joints of crystals of oxide phases with the host rocks. Therefore, the composition of oxide and silicate phases is the cause of the previously established retardation of the process of melt formation during iron ore sintering with the participation of magnetite concentrate of Kovdor deposit.