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Table 2

Comparison of process responses in both microwave and muffle furnace reduction.

Response Type of ore Microwave reduction Muffle furnace reduction
Energy (kWh/tonne) Hematite 405 168.1
BHQ 223.7
BHJ 218.8
Synthetic mixture 220.5
Sat. magnetization (emu/g) Hematite 0.9–18 3.3–46.7
BHQ 7.5–42.3 7–26.8
BHJ 9.1–38 7.6–35.3
Synthetic mixture 0.7–12 5.5–36.1
Yield (%) Hematite 48.1–94.6 19.6–97.2
BHQ 27.1–72. 1 30.1–84.4
BHJ 54.7–70.3 41.1–91.7
Synthetic mixture 19.1–60.1 5.4–85.7
Metallic iron (%) Hematite 1.2–7.5 0.8–1.2
BHQ 1.5–17.6 0.7–1.3
BHJ 1.7–19.1 0.9–1
Synthetic mixture 0.9–5.3 0.9–1.1

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