3558 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
As shown in Figure 7, the apparent morphology of per-
meable bricks with different sintering temperatures varies
greatly. When the sintering temperature is 1110 °C, most
of the aggregate particles do not undergo fusion changes
still exist in the original form, the surface of the physical
phase did not show apparent phase transformation, the
bonding effect between the aggregate particles is not signifi-
cant, the densification is poor, resulting in permeable bricks
at 1110 °C when the flexural strength of the low perme-
ability coefficient of water permeability is high. When the
sintering temperature reaches 1125 °C, the mineral compo-
nents in the tailings at high temperatures under the action
of the surface of the phase transformation occurs, the newly
generated material phase will be for the occurrence of the
reaction of the material phase bonded together to reduce
the porosity and improve the strength of permeable bricks.
When the temperature increased to 1135 °C, the surface
of the sample began to appear bonding phenomenon.
At the same time, the unreacted particles began to bond
tightly, with the sintering temperature continuing to rise,
the bonding phenomenon began to be significant, the bond
between the particles increased, and the densification and
strength of the samples significantly increased. When the
sintering temperature was increased to 1145°C, the bond-
ing effect of the samples was more significant[Hui et al.,
2022]. With less and less unmelted tailings, the supporting
particles in the aggregate will gradually decrease, which in
turn will cause the permeable bricks to deform, resulting in
a decrease in water permeability, which corresponds to the
results of the performance test of sintered permeable bricks
at different temperatures.
Industrial CT Analysis of the Pore Structure of
Permeable Bricks
A 10 mm × 10 mm × 10 mm square-shaped sample was
intercepted from the finished tailings-based sintered perme-
able bricks prepared under optimum material conditions,
sintering regime, and process parameters, and the perme-
able brick sample is shown in Figure 8. The samples were
imaged by high-resolution scanning using GE’s Vtomex-
type industrial CT, and the profiles and 3D imaging scans
of the permeable brick samples are shown in Figure 9. As
can be seen in Figure 9, the structural state of the profile
and 3D view of the permeable brick sample is good, the
grey part of the figure is the tailings regenerated aggregate
and the dark area is the pores, the pores in the dark color
Figure 7. Microscopic morphology of permeable bricks with different sintering temperatures
As shown in Figure 7, the apparent morphology of per-
meable bricks with different sintering temperatures varies
greatly. When the sintering temperature is 1110 °C, most
of the aggregate particles do not undergo fusion changes
still exist in the original form, the surface of the physical
phase did not show apparent phase transformation, the
bonding effect between the aggregate particles is not signifi-
cant, the densification is poor, resulting in permeable bricks
at 1110 °C when the flexural strength of the low perme-
ability coefficient of water permeability is high. When the
sintering temperature reaches 1125 °C, the mineral compo-
nents in the tailings at high temperatures under the action
of the surface of the phase transformation occurs, the newly
generated material phase will be for the occurrence of the
reaction of the material phase bonded together to reduce
the porosity and improve the strength of permeable bricks.
When the temperature increased to 1135 °C, the surface
of the sample began to appear bonding phenomenon.
At the same time, the unreacted particles began to bond
tightly, with the sintering temperature continuing to rise,
the bonding phenomenon began to be significant, the bond
between the particles increased, and the densification and
strength of the samples significantly increased. When the
sintering temperature was increased to 1145°C, the bond-
ing effect of the samples was more significant[Hui et al.,
2022]. With less and less unmelted tailings, the supporting
particles in the aggregate will gradually decrease, which in
turn will cause the permeable bricks to deform, resulting in
a decrease in water permeability, which corresponds to the
results of the performance test of sintered permeable bricks
at different temperatures.
Industrial CT Analysis of the Pore Structure of
Permeable Bricks
A 10 mm × 10 mm × 10 mm square-shaped sample was
intercepted from the finished tailings-based sintered perme-
able bricks prepared under optimum material conditions,
sintering regime, and process parameters, and the perme-
able brick sample is shown in Figure 8. The samples were
imaged by high-resolution scanning using GE’s Vtomex-
type industrial CT, and the profiles and 3D imaging scans
of the permeable brick samples are shown in Figure 9. As
can be seen in Figure 9, the structural state of the profile
and 3D view of the permeable brick sample is good, the
grey part of the figure is the tailings regenerated aggregate
and the dark area is the pores, the pores in the dark color
Figure 7. Microscopic morphology of permeable bricks with different sintering temperatures