Abstract
The induration process of oxidized pellet, containing the oxidation of magnetite phase (Fe3O4) and the sintering of oxidized magnetite phase (hematite–Fe2O3), is significant to obtain sufficient pellet strength. The current study focuses on the induration mechanisms of MgO flux pellet in terms of the oxidation process of Fe3O4 and densification process of the pellet. It is found that MgO dosage negatively affects the oxidation of Fe3O4 into Fe2O3. The number of recrystallized grain of Fe2O3 in the MgO flux pellet is less than that in the Non-MgO flux pellet. Additionally, an unreacted core model was applied to consider and clarify the oxidation of Fe3O4. According to the verification experiments, the experimental data and calculated results fit well. Therefore, the unreacted core model can describe the oxidation of Fe3O4 in the pellet induration process. Moreover, based on the development of pore parameters during the pellet induration process, a new index, the so-called oxide densification index (ODI) was defined to profoundly specify the densification degree of the pellet. The results show that the ODI of the MgO flux pellet maintains at a lower level compared with that of the Non-MgO flux pellet. It illustrates that MgO can substantially restrain the pellet densification process.
Highlights
Agglomeration of iron ore pellet begins with the grinding and cleaning of the iron ore to meet the desired chemical quality
The mechanical strength of acid pellet is better, which is favorable for a pellet to withstand double forces in BF process including the extrusion force from the top layer burden and the friction force from the high-speed gas flow beneath the furnace; the iron-grade of pellet is higher, which is favorable for effective iron content input in burden column and enhancing production efficiency; the particle size of pellet is relatively uniform, favorable for burden permeability of BFs
It4.is acknowledged that both the oxidation of magnetite (Fe O4 ) into hematite (Fe2 O3 ) and the sintering of hematite are important for pellet induration process. 3The lattice will transit from sintering hematite are important for pellet induration process
Summary
Agglomeration of iron ore pellet begins with the grinding and cleaning of the iron ore to meet the desired chemical quality. As a traditional iron bearing burden for blast furnace (BF), has many merits in terms of metallurgical properties and intrinsic properties [2]. The mechanical strength of acid pellet is better, which is favorable for a pellet to withstand double forces in BF process including the extrusion force from the top layer burden and the friction force from the high-speed gas flow beneath the furnace; the iron-grade of pellet is higher, which is favorable for effective iron content input in burden column and enhancing production efficiency; the particle size of pellet is relatively uniform, favorable for burden permeability of BFs. the pellet portion in burden materials is increasing
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