Influence of MgO on the oxidation and induration of Hongge vanadium titanomagnetite pellets

Abstract

As part of the development of a novel and clean smelting process for the comprehensive utilization of Hongge vanadium titanomagnetite (HVTM), the objective of this study was to investigate the influence of MgO on the oxidation and induration of HVTM pellets (HVTMP). The results showed that the oxidation degree and compressive strength decreased significantly with the increase in added MgO, which corresponded to the increase in porosity. MgO reacted with Fe 2 O 3 to form Mg-Fe solid solution. The evolution in microstructure was explained by the interactions between MgO and Fe 2 O 3 at the grain boundaries. Mg 2+ diffusion affected the oxidation and induration, and cracks were formed, resulting in the uneven distribution of grains and the inhibition of hematite recrystallization. Furthermore, the grain size decreased significantly. Based on the results, we proposed a diagram to describe the mechanism, which showed that MgO had a negative effect on the oxidation and induration of HVTMP.

Review of pellets and blast furnace slag research progress: the effects of MgO on metallurgical properties

“…In the oxidation induration of vanadium titanomagnetite pellets, MgO reduces the compressive strength and increases the porosity of pellets, and adversely affects the oxidation induration [81]. MgO results in the formation of MgFeO 4 , which reduces the oxidation degree of pellet.…”

Effect of Cr2O3 on the Kinetics Mechanism and Microstructure of Pellet During Oxidation Roasting Process

“…In recent years, numerous studies have been conducted on the impact of constituents on the production of HCVTM pellets. [17][18][19][20][21][22][23][24] Zeng et al [17] studied the effect of B 2 O 3 on the degree of oxidation and compressive strength of HCVTM pellets. Li et al [18] evaluated the relationship between the HCVTM porosity and various MgO additions.…”

“…[17][18][19][20][21][22][23][24] Zeng et al [17] studied the effect of B 2 O 3 on the degree of oxidation and compressive strength of HCVTM pellets. Li et al [18] evaluated the relationship between the HCVTM porosity and various MgO additions. According to Lu et al, [19] the addition of SiO 2 significantly alters the compressive strength and reducibility of the oxidized pellets.…”

Investigate the oxidation induration mechanism of manganese-bearing magnetite concentrate pellets

“…The current research was mainly focused on the oxidation induration mechanism of aluminium-containing, silicon-containing, and titanium-containing pellets [13][14][15][16][17][18][19][20]. Wang et al [5] studied the roasting characteristics of fluorinebearing magnetite.…”