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

Abstract

In this study, to promote the application of manganese-containing magnetite, the oxidation induration mechanism for manganese-bearing magnetite concentrate pellets (MBMCP) was investigated. X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, and thermogravimetric analyses were carried out to systematically study the phase composition, microstructure, elemental distribution, and oxidation behaviour of the MBMCP. The results indicated that Mn 3 O 4 exerted had a negative effect on the oxidation induration of the pellet. With an increase in the amount of added Mn 3 O 4 , the compressive strength and oxidation degree significantly decreased and the porosity increased. The content of the formed Mn-Fe solid solution (MnFe 2 O 4 ) increased with the increase of Mn 3 O 4 , which made the matrix of the MBMCP change from dense to porous, suggesting that the growth of haematite grains was inhibited and the bridging between haematite grains was broken. These results provide the theoretical and technical foundations for the industrial production of MBMCP.

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

“…Slag phase consolidation and calcium ferrite-based bonding also play an important role in the flux pellets with higher basicity [29]. Scholars agree that the addition of different kinds of MgO additives adversely affects the compressive strength of pellets [30][31][32][33][34]. The mainstream viewpoints explain the effect of MgO on oxidation induration and compressive strength from two aspects: pellet porosity and magnesium-magnetite solid solution.…”

The Effects of MgO and Al2O3 Content in Sinter on the Softening–Melting Properties of Mixed Ferrous Burden

“…However, it has inferior reduction and SM properties due to low-melting fayalitic slag [5]. The pelletizing process is much cleaner than the sintering process, while the former has low yields [6]. Sinter and pellets have become the popular ferrous materials for BF ironmaking [7].…”