1842 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
where:
QH2 and QN2 =the flow rates of H2 and N2, respectively.
MFe =the metal iron content.
TFe =the total iron content of the reduction product.
The mineral composition of samples under different reduc-
tion conditions was analyzed using the X-ray diffraction
(XRD) analyzer (PW3040, PANalytical B.V. Ltd.). The
operating parameters were set as follows: Cu Kα target
radiation, nickel filter, solid detector, scanning rate of 12
°/min, scanning range of 5 ° ~90 °, tube voltage of 40 kV,
and tube current of 40 mA. XRD data were further ana-
lyzed using Jade- 6.
Field emission scanning electron microscopy (SEM)
and energy dispersion spectroscopy (EDS) (ZEISS ULTRA
PLUS) were utilized to examine the microstructure and
composition of the micro-region of the convective reduc-
tion products. The main working parameters for SEM-EDS
were as follows: (1) resolution: 0.8 nm/15kv, 1.6 nm/1kv
(2) Acceleration voltage: 20 V ~30 kV (3) magnification:
12 times ~1 million times.
RESULTS
Effect of reduction conditions on metallization degree
Effect of Reduction Temperature
Figure 4(a) illustrated the investigation into the effect of
reduction temperature on the degree of metallization of
the reduction products under the conditions of a reduc-
tion temperature ranging from 600 °C to 900 °C, H2
600 700 800 900
30
40
50
60
70
80
Metallization ratio/%
(a)
12
16
20
24
FeO/%
10 20 30 40 50 60 70 80 90
0
10
20
30
40
50
60
70
80
Concentration/%
Mr/%
(b)
8
16
24
32
40
48
FeO/%
0 5 10 15 20 25 30
0
10
20
30
40
50
60
70
80
Time/min
Mr/%
10
20
30
40
FeO/%
(c)
600 700 800 900
30
40
50
60
70
80
-200+400Mr/%
-100+150Mr/%
8
12
16
20
24
-200+400 FeO/%
-100+150 FeO/%
(d)
Figure 4. Effect of roasting parameters on the metallization ratio of reduced product: (a)- Reduction temperature (b)- H2
concentration (c)- Reduction time (d)- Two particle sizes
Metallization
ratio/%
FeO/%
Meta
zation
ratio/%
FeO/%
Metallization
ratio/%
FeO/%
Metall
r FeO/%
where:
QH2 and QN2 =the flow rates of H2 and N2, respectively.
MFe =the metal iron content.
TFe =the total iron content of the reduction product.
The mineral composition of samples under different reduc-
tion conditions was analyzed using the X-ray diffraction
(XRD) analyzer (PW3040, PANalytical B.V. Ltd.). The
operating parameters were set as follows: Cu Kα target
radiation, nickel filter, solid detector, scanning rate of 12
°/min, scanning range of 5 ° ~90 °, tube voltage of 40 kV,
and tube current of 40 mA. XRD data were further ana-
lyzed using Jade- 6.
Field emission scanning electron microscopy (SEM)
and energy dispersion spectroscopy (EDS) (ZEISS ULTRA
PLUS) were utilized to examine the microstructure and
composition of the micro-region of the convective reduc-
tion products. The main working parameters for SEM-EDS
were as follows: (1) resolution: 0.8 nm/15kv, 1.6 nm/1kv
(2) Acceleration voltage: 20 V ~30 kV (3) magnification:
12 times ~1 million times.
RESULTS
Effect of reduction conditions on metallization degree
Effect of Reduction Temperature
Figure 4(a) illustrated the investigation into the effect of
reduction temperature on the degree of metallization of
the reduction products under the conditions of a reduc-
tion temperature ranging from 600 °C to 900 °C, H2
600 700 800 900
30
40
50
60
70
80
Metallization ratio/%
(a)
12
16
20
24
FeO/%
10 20 30 40 50 60 70 80 90
0
10
20
30
40
50
60
70
80
Concentration/%
Mr/%
(b)
8
16
24
32
40
48
FeO/%
0 5 10 15 20 25 30
0
10
20
30
40
50
60
70
80
Time/min
Mr/%
10
20
30
40
FeO/%
(c)
600 700 800 900
30
40
50
60
70
80
-200+400Mr/%
-100+150Mr/%
8
12
16
20
24
-200+400 FeO/%
-100+150 FeO/%
(d)
Figure 4. Effect of roasting parameters on the metallization ratio of reduced product: (a)- Reduction temperature (b)- H2
concentration (c)- Reduction time (d)- Two particle sizes
Metallization
ratio/%
FeO/%
Meta
zation
ratio/%
FeO/%
Metallization
ratio/%
FeO/%
Metall
r FeO/%