XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1849
reduction, hematite underwent rapid reduction to mag-
netite when exposed to hydrogen, a process that occurred
swiftly and thoroughly. Following this, the reduction of
magnetite proceeded from the outer layers towards the
interior of the mineral. Particle surface was first reduced to
either metallic iron or wüstite, while the iron phase deeper
within the mineral remains primarily as magnetite or a mix-
ture of magnetite and wüstite. This createed a triple coex-
istence of magnetite, wüstite, and metallic iron within the
mineral structure, with low-valent iron oxides wrapped by
Figure 9. Cross-section SEM images of roasted samples at different reduction temperatures: (a) 600 °C (b) 700 °C (c), (d)
800 °C (e), (f) 900 °C, (g), (h), (i) EDS results (continued)
reduction, hematite underwent rapid reduction to mag-
netite when exposed to hydrogen, a process that occurred
swiftly and thoroughly. Following this, the reduction of
magnetite proceeded from the outer layers towards the
interior of the mineral. Particle surface was first reduced to
either metallic iron or wüstite, while the iron phase deeper
within the mineral remains primarily as magnetite or a mix-
ture of magnetite and wüstite. This createed a triple coex-
istence of magnetite, wüstite, and metallic iron within the
mineral structure, with low-valent iron oxides wrapped by
Figure 9. Cross-section SEM images of roasted samples at different reduction temperatures: (a) 600 °C (b) 700 °C (c), (d)
800 °C (e), (f) 900 °C, (g), (h), (i) EDS results (continued)