XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1327
C Q Q Q
Q Q
100%
R
CO H N2
CO H
2
2 #=++
+
^h (1)
%100 ##h a
b
b i
a i =-
-(2)
where QCO, QH
2
,and QN2 are the flow rates of CO, H2,
and N2, respectively, and CR represents the concentration
of the reduction gas. The iron grades of the feed, magnetic,
and non-magnetic samples are represented by α, β, and θ,
respectively, and the iron recovery is represented by η.
RESULTS AND DISCUSSION
Pilot-Scale Tests
Influence of Reducing Temperature on Separation
Performances
The reaction temperature of the HMPT reactor is con-
trolled by the amount of natural gas burned in the sus-
pension furnace. The reduction temperature during the
phase transformation process in the HMPT reactor has
a significant effect on the quality of the reduced product
(Yuan et al., 2020a). Under controlled conditions with a
feed rate of 120 kg/h, a reducing gas flow rate of 3.5 m3/h
and a reducing gas concentration of 22.5%, the influence
of the reducing temperature on the separation efficiency of
the transformed products was investigated. The results, as
shown in Figure 3, indicate that as the reducing tempera-
ture increases, the TFe content of the magnetic product
remains relatively stable in the range of 64.21% to 66.02%.
However, the yield and TFe recovery increase rapidly.
When the reduction temperature is increased from 330°C
to 480°C, the iron recovery of the concentrate increases
from 62.05% to 92.90%. Further increases in the reduc-
tion temperature result in only a small increase in the mag-
netic product recovery rate. To ensure optimum reduction
effects, the appropriate HMPT temperature is found to be
500°C.
Influence of Gas Flow Rate on Separation Performances
Throughout the HMPT process, the flow rate of the reduc-
ing gas also significantly affects the magnetic product
recovery efficiency (Tang et al., 2022a). In this study, H2
and CO were selected as the main reducing gases for the
HMPT process, with the total inlet ratio of H2 to CO set
at 3:1. By controlling the HMPT temperature at 500°C,
with a feed rate of 120 kg/h and a reducing gas concen-
tration of 22.5%, the effect of the reducing gas flow rate
on the separation performance of the transformed products
Figure 2. Pilot-scale HMPT system
C Q Q Q
Q Q
100%
R
CO H N2
CO H
2
2 #=++
+
^h (1)
%100 ##h a
b
b i
a i =-
-(2)
where QCO, QH
2
,and QN2 are the flow rates of CO, H2,
and N2, respectively, and CR represents the concentration
of the reduction gas. The iron grades of the feed, magnetic,
and non-magnetic samples are represented by α, β, and θ,
respectively, and the iron recovery is represented by η.
RESULTS AND DISCUSSION
Pilot-Scale Tests
Influence of Reducing Temperature on Separation
Performances
The reaction temperature of the HMPT reactor is con-
trolled by the amount of natural gas burned in the sus-
pension furnace. The reduction temperature during the
phase transformation process in the HMPT reactor has
a significant effect on the quality of the reduced product
(Yuan et al., 2020a). Under controlled conditions with a
feed rate of 120 kg/h, a reducing gas flow rate of 3.5 m3/h
and a reducing gas concentration of 22.5%, the influence
of the reducing temperature on the separation efficiency of
the transformed products was investigated. The results, as
shown in Figure 3, indicate that as the reducing tempera-
ture increases, the TFe content of the magnetic product
remains relatively stable in the range of 64.21% to 66.02%.
However, the yield and TFe recovery increase rapidly.
When the reduction temperature is increased from 330°C
to 480°C, the iron recovery of the concentrate increases
from 62.05% to 92.90%. Further increases in the reduc-
tion temperature result in only a small increase in the mag-
netic product recovery rate. To ensure optimum reduction
effects, the appropriate HMPT temperature is found to be
500°C.
Influence of Gas Flow Rate on Separation Performances
Throughout the HMPT process, the flow rate of the reduc-
ing gas also significantly affects the magnetic product
recovery efficiency (Tang et al., 2022a). In this study, H2
and CO were selected as the main reducing gases for the
HMPT process, with the total inlet ratio of H2 to CO set
at 3:1. By controlling the HMPT temperature at 500°C,
with a feed rate of 120 kg/h and a reducing gas concen-
tration of 22.5%, the effect of the reducing gas flow rate
on the separation performance of the transformed products
Figure 2. Pilot-scale HMPT system