Reduction Process of Pellet Containing High Chromic Vanadium-Titanium Magnetite in Cohesive Zone

摘要

In the present study, the reduction process of pellet containing high chromic vanadium-titanium magnetite in cohesive zone has been investigated. To elucidate the reduction process including the softening and melting properties, structure changes and migration processes of valuable components (Fe, V, Ti, and Cr) in pellet containing high chromic vanadium-titanium magnetite in cohesive zone, the experiment was carried out at different temperatures and the pellet samples were analyzed by the methods of XRD, SEM, and chemical analysis. The results of reduction process show that the temperature range of cohesive zone of pellet is from 1087.9 to 1338.3 degrees C and the maximum differential pressure of the burden is 15859Pa at the temperature of 1291 degrees C. The reduction process of pellet was gradually conducted from outside to inside, which could form a layer of iron shell on the outer surface of the pellet. A lot of wustite could be generated in the core of pellet when the reduction temperature exceeded 1100 degrees C. The migration process of iron is Fe2O3Fe3O4FeOFe, while the generated FeO could react with SiO2 forming 2FeOSiO(2). The reduction process of titanium is Fe(2)O(3)3TiO(2)Fe(5)TiO(8)Fe(2)TiO(4)FeTiO(3)Ti(O0.19C0.53N0.32)Ti(C,N)[Ti] and MgOTiO2Ti(C,N)[Ti]. The migration process of vanadium is V2O3VN, VC[V] and the chromium oxide was reduced as follows: (Fe0.6Cr0.4)(2)O-3 FeCr2O4[Cr].