International Scholarly Research Notices / 2012 / Article / Tab 3 / Research Article
Characterisation of the Physical and Metallurgical Properties of Natural Iron Ore for Iron Production Table 3 Preferred characteristics for iron ore lumps used for blast furnace (BF) and direct reduction (DR) processes and the characteristics of Muko iron ores.
Reduction processes, iron ores Chemical composition (%) Physical properties Reducibility (%/min) References Fe SiO2 Al2 O3 S P Tumble Index (% + 6.75 mm) Abrasion Index (% −5 mm) BF Process ≥58 (L) ≥65 (P) <6 (L) 3-4 (L) 0.1 (L) 0.05 (P) <0.07 (L) >70 (L) >93–95 (P) <5–10 (L) <7 (P) 0.5–1.0 (L) [2 , 6 , 9 , 10 ]; <4 (P) <0.02 (P) 0.8–1.4 (P) <6 (S) <0.05 (S) 1.1–1.4 (S) DR Process: Midrex 66–68 (L) (≤3-4)* L ≤0.025 (L) 0.03–0.06 (L) ≥85 (L) ≤5 (L) 67–69 (P) (≤4)* P ≤0.008 (P) ≤0.03 (P) ≥90–95 (P) ≤3-4 (P)
0.92 (L)
[8 , 11 –13 ] HYL III ≥64 (L)
(≤4)* L, P 0.005 (L) ≤0.05 (L, P) ≥90 (L) ≤10 (L) ≥0.4 (L, P) ≥66 (P) 0.011 (P) ≥95 (P) ≤5 (P)
[8 , 14 ] SL/RN ≥65–67 (L) (≤2-3)* L ≤0.02 (L) ≤0.04 (L) ≥88 (L) ≤5 (L) ≥0.5-0.6 (L) [11 , 14 ] Ug1 68.4 0.96 0.58 <0.001 <0.02 89.72 0.83 — [6 ], ps** Ug2 67.9 0.80 0.65 0.002 0.02 88.45 1.50 — Ug3 68.7 0.41 0.35 0.006 0.02 91.68 0.54 — Ug4 69.0 0.62 0.43 0.001 <0.02 90.30 0.88 — Ug5 67.5 1.20 1.00 <0.001 0.05 92.96 3.41 — Ug6 60.6 5.10 6.00 0.003 0.2 89.28 0.67 0.868
* (SiO2 + Al2 O3 ), ** ps: present study, L: Lump iron ore, P: Pellet, and S: Sinter.