Hydrogen Reduction of Hematite Ore Fines to Magnetite Ore Fines at Low Temperatures

Figure 11

SEM images of samples reduced for (a) 1 h at 400°C, (b) 2.5 h at 400°C, (c) 0.5 h at 500°C, and (d) 2 h at 500°C.

(a)

(b)

(c)

(d)