XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3557
regeneration aggregate prepared from tailings into semi-
molten and molten states, leading to the deformation and
collapse of tailings regeneration aggregate particles, filling
the inter-aggregate pore space, increasing the densification,
enhancing the splitting flexural strength, and decreasing
the permeability performance.
In summary, the firing temperature was selected to be
1135°C, the holding time was 40 min, the split flexural
strength of the prepared permeable bricks was 3.65MPa,
and the permeability coefficient was 1.89×10–2cms–1 to
meet the index requirements of the Chinese standard. The
microstructural analysis of the permeable bricks was car-
ried out to clarify further the strength-forming and pore-
constructing mechanisms of the permeable bricks.
Analysis of the Physical Phase Composition of Sintered
Permeable Brick
The XRD analysis results of the samples with different
sintering temperatures are shown in Figure 6. The main
phases in the permeable brick material include SiO2,
Albite, Augite, Diopside, and Anorthite. Compared with
GT, DT, and Kaolin, the permeable bricks underwent a
phase transformation during sintering to generate new
phases, such as Augite, Diopside, and Anorthite, and these
newly generated phases tightly encapsulated the unreacted
SiO2 and adhered with each other to form a skeleton struc-
ture [Wei et al., 2021]. When the sintering temperature
increased from 1110°C to 1145°C, the intensity of the
diffraction peaks corresponding to SiO2 in the permeable
bricks decreased, and the intensity of the diffraction peaks
corresponding to the newly generated Augite, Diopside and
Anorthite increased, which indicated thatthe internal phase
transformation of the permeable bricks continued to occur,
and there were continuous production of sintered products.
those can wrap around the surface of unreacted raw mate-
rials, filling the pore space, increasing the densification,
and further increasing the fracture strength of permeable
bricks[Ye et al., 2015]. It is worth noting that the increase
in the densification also led to the decrease in the water
permeability of the permeable bricks.
Micro-Morphological Analysis of Permeable Bricks
In order to investigate the changes in the surface morphol-
ogy of aggregate particles in permeable bricks at different
sintering temperatures, the microscopic morphology of per-
meable bricks at different sintering temperatures was ana-
lyzed using SEM. The results are shown in Figure 7. Where
A, B, C, and D correspond to the microphotographs at dif-
ferent magnifications for sintering temperatures of 1110°C,
1125°C, 1135°C and 1145°C, respectively.
10 20 30 40 50 60 70 80 90
5 Anorthite
5 55 5
4 Diopside
3 Augite
2 Albite
4
4
4
2 2 3 3
3
1 SiO2
2
2
2
1 1 1
1
1
1
11 1 1
Figure 6. XRD patterns of permeable bricks with different sintering temperatures
Intensity
regeneration aggregate prepared from tailings into semi-
molten and molten states, leading to the deformation and
collapse of tailings regeneration aggregate particles, filling
the inter-aggregate pore space, increasing the densification,
enhancing the splitting flexural strength, and decreasing
the permeability performance.
In summary, the firing temperature was selected to be
1135°C, the holding time was 40 min, the split flexural
strength of the prepared permeable bricks was 3.65MPa,
and the permeability coefficient was 1.89×10–2cms–1 to
meet the index requirements of the Chinese standard. The
microstructural analysis of the permeable bricks was car-
ried out to clarify further the strength-forming and pore-
constructing mechanisms of the permeable bricks.
Analysis of the Physical Phase Composition of Sintered
Permeable Brick
The XRD analysis results of the samples with different
sintering temperatures are shown in Figure 6. The main
phases in the permeable brick material include SiO2,
Albite, Augite, Diopside, and Anorthite. Compared with
GT, DT, and Kaolin, the permeable bricks underwent a
phase transformation during sintering to generate new
phases, such as Augite, Diopside, and Anorthite, and these
newly generated phases tightly encapsulated the unreacted
SiO2 and adhered with each other to form a skeleton struc-
ture [Wei et al., 2021]. When the sintering temperature
increased from 1110°C to 1145°C, the intensity of the
diffraction peaks corresponding to SiO2 in the permeable
bricks decreased, and the intensity of the diffraction peaks
corresponding to the newly generated Augite, Diopside and
Anorthite increased, which indicated thatthe internal phase
transformation of the permeable bricks continued to occur,
and there were continuous production of sintered products.
those can wrap around the surface of unreacted raw mate-
rials, filling the pore space, increasing the densification,
and further increasing the fracture strength of permeable
bricks[Ye et al., 2015]. It is worth noting that the increase
in the densification also led to the decrease in the water
permeability of the permeable bricks.
Micro-Morphological Analysis of Permeable Bricks
In order to investigate the changes in the surface morphol-
ogy of aggregate particles in permeable bricks at different
sintering temperatures, the microscopic morphology of per-
meable bricks at different sintering temperatures was ana-
lyzed using SEM. The results are shown in Figure 7. Where
A, B, C, and D correspond to the microphotographs at dif-
ferent magnifications for sintering temperatures of 1110°C,
1125°C, 1135°C and 1145°C, respectively.
10 20 30 40 50 60 70 80 90
5 Anorthite
5 55 5
4 Diopside
3 Augite
2 Albite
4
4
4
2 2 3 3
3
1 SiO2
2
2
2
1 1 1
1
1
1
11 1 1
Figure 6. XRD patterns of permeable bricks with different sintering temperatures
Intensity