Characterization of the burden behaviour of iron ore pellets mixed with nut coke under simulated blast furnace conditions

Figures & data

Table 1. Chemical analysis of the iron ore pellets (wt-%).

Fe (Total)	SiO2	CaO	Al2O3	MgO	MnO	TiO2	ZnO
64.40	4.50	0.22	1.20	1.20	0.37	0.20	0.23

Table 2. Thermal and gas profile followed during the experiments [8].

Segment	Temperature (^oC)	Rate (^oC/min)	CO (%)	H2 (%)	CO2 (%)	N2 (%)	Gas rate (litre/min)
1	20–250	7	0	0	0	100	5
2	250–400	7	25	4.5	20.5	50	15
3	400–600	5	25	4.5	20.5	50
4	600–800	5	30	4.5	15.5	50
5	800–900	5	33	5	12	50
6	900–950	5	33	5	12	50
7	950–1050	1.2	33	5	12	50
8	1050–1100	5	42	8	0	50
9	1100–1300	5	42	8	0	50
10	1300–1400	5	42	8	0	50

Figure 1. Photographs of the sample bed quenched from high temperatures [8]. Encircled pellets are selected for detail analysis.

Figure 2. Phase identification and quantification from the micrograph using image processing application (GIMP).

Figure 3. XRD patterns of the quenched pellets.

Figure 4. SEM–EDS micrographs of the quenched pellet sections.

Figure 5. Sample quenched from 1300^oC.

Figure 6. Phases and pores distribution in the pellet quenched at 1300^oC.

Figure 7. Phases and pores distribution in pellets quenched from 1400^oC without nut coke.

Figure 8. Phases and pores distribution in pellets quenched from 1400^oC with nut coke (20 wt-%).

Figure 9. Reflected light microscopy of the pellet quenched from 1400^oC with 20 wt-% mixed nut coke.

Figure 10. Hollow icicles formation in the cohesive zone, adapted from Gudenau et al. [13].

Figure 11. Micrograph of the pellet quenched from 1400^oC without nut coke.

Song Q. Effect of nut coke on the performance of the ironmaking blast furnace [dissertation]. Delft: Delft University of Technology; 2013.

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Gudenau HW, Senk D, Wang S, et al. Research in the reduction of iron ore agglomerates including coal and C-containing dust. ISIJ Int. 2005;45:603–608. doi: 10.2355/isijinternational.45.603

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