XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1847
of unreduced magnetite. At 800°C, the interior no lon-
ger showed magnetite or wüstite, because there was very
little oxygen, indicating that metallic iron was the domi-
nant component (Point 6). Continuing the temperature
increase to 900°C, for particles with a distinct acicular
structure, the oolite layer and the outside of the particles
still produce a large amount of metallic iron (Figure 9e),
similar to the distribution of iron at 800°C (Figure 9c).
However, for some of the particles (Figure 9f), iron melt-
ing and aggregation occurs, and iron completely filled the
mineral, making it difficult to see the oolitic structure on
the cut surface, which was even more obvious than that at
800°C (Figure 9d). We could speculate that the aggregation
Figure 8. SEM and EDS rusults of roasted samples surface at different reduction temperatures (a)
600°C, (b) 700°C, (c) 800°C, (d) 900°C, (h) EDS results
of unreduced magnetite. At 800°C, the interior no lon-
ger showed magnetite or wüstite, because there was very
little oxygen, indicating that metallic iron was the domi-
nant component (Point 6). Continuing the temperature
increase to 900°C, for particles with a distinct acicular
structure, the oolite layer and the outside of the particles
still produce a large amount of metallic iron (Figure 9e),
similar to the distribution of iron at 800°C (Figure 9c).
However, for some of the particles (Figure 9f), iron melt-
ing and aggregation occurs, and iron completely filled the
mineral, making it difficult to see the oolitic structure on
the cut surface, which was even more obvious than that at
800°C (Figure 9d). We could speculate that the aggregation
Figure 8. SEM and EDS rusults of roasted samples surface at different reduction temperatures (a)
600°C, (b) 700°C, (c) 800°C, (d) 900°C, (h) EDS results