XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1841
Al and Ca were present at around 3%, while the harmful
element P was elevated at 1.31%.
Figure 2 presented the analysis results of point scanning
analysis conducted on oolitic iron ore. The results confirmed
that the samples primarily consist of iron oxide, quartz
(point 4 and point 3), and apatite (point 2 and point 1),
wherein iron and gangue minerals were intricately inter-
grown, forming a distinctive concentric oolitic structure.
The fluidization reduction experiment was conducted
using a laboratory-scale fluidized bed (OTF-1200X-S-VT,
HFKJ, China), and the schematic diagram of the experi-
mental equipment was illustrated in Figure 3. The reactor
is constructed from high-purity quartz glass with an inner
diameter of 25mm. The gas distributor employs a porous
quartz plate with a hole diameter of 0.1 mm per hole.
Experimental Method
The experimental procedure involved heating the furnace
to the target reaction temperature at a rate of 15 °C/min.
Subsequently, a 10.0g sample was placed in the furnace
tube. After securing the sealer to the top of the furnace
tube, N2 was introduced into the tube through the mixer
at a gas flow rate of 800 mL/min Upon reaching the set
temperature, hydrogen was injected, and the hydrogen
concentration was adjusted as per the experimental require-
ments. At the experiment’s conclusion, hydrogen injection
was halted, nitrogen was purged, and the reduction prod-
uct was discharged after cooling.
The hydrogen concentration (HC) represents the ratio
of hydrogen to nitrogen content, as shown in Eq. (1). The
metallization degree (MD) characterized the reduction
degree of the products in each experiment, and its calcula-
tion is presented in Eq. (2).
HC Q Q
Q
100%
H2 N2
H2 =+(1)
MD TFe
MFe 100% =(2)
Figure 2. SEM and EDS images of oolitic hematite
Figure 3. Schematic diagram of suspension roasting system
Al and Ca were present at around 3%, while the harmful
element P was elevated at 1.31%.
Figure 2 presented the analysis results of point scanning
analysis conducted on oolitic iron ore. The results confirmed
that the samples primarily consist of iron oxide, quartz
(point 4 and point 3), and apatite (point 2 and point 1),
wherein iron and gangue minerals were intricately inter-
grown, forming a distinctive concentric oolitic structure.
The fluidization reduction experiment was conducted
using a laboratory-scale fluidized bed (OTF-1200X-S-VT,
HFKJ, China), and the schematic diagram of the experi-
mental equipment was illustrated in Figure 3. The reactor
is constructed from high-purity quartz glass with an inner
diameter of 25mm. The gas distributor employs a porous
quartz plate with a hole diameter of 0.1 mm per hole.
Experimental Method
The experimental procedure involved heating the furnace
to the target reaction temperature at a rate of 15 °C/min.
Subsequently, a 10.0g sample was placed in the furnace
tube. After securing the sealer to the top of the furnace
tube, N2 was introduced into the tube through the mixer
at a gas flow rate of 800 mL/min Upon reaching the set
temperature, hydrogen was injected, and the hydrogen
concentration was adjusted as per the experimental require-
ments. At the experiment’s conclusion, hydrogen injection
was halted, nitrogen was purged, and the reduction prod-
uct was discharged after cooling.
The hydrogen concentration (HC) represents the ratio
of hydrogen to nitrogen content, as shown in Eq. (1). The
metallization degree (MD) characterized the reduction
degree of the products in each experiment, and its calcula-
tion is presented in Eq. (2).
HC Q Q
Q
100%
H2 N2
H2 =+(1)
MD TFe
MFe 100% =(2)
Figure 2. SEM and EDS images of oolitic hematite
Figure 3. Schematic diagram of suspension roasting system