XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3555
1200°C, so that the physical phase in the sintered brick
undergoes transformation and reconstruction. The per-
meable bricks were prepared according to the molding
pressure of 3MPa. The sintering temperatures were set at
1100°C, 1110°C, 1120°C, 1125°C, 1135°C, 1145°C and
1150°C, respectively. To investigate the effects of different
sintering temperatures on the splitting tensile strength and
permeability coefficient of tailings-based sintered perme-
able bricks, and the results were shown in Figure 4.
As can be seen from Figure 4, with the increase of
temperature, the splitting flexural strength of permeable
bricks continues to rise, when the sintering temperature
reached 1135 °C, the flexural strength of permeable bricks
is 3.65 MPa, meeting the requirements of the Chinese
standard flexural strength Rf3.0 indicators, the temperature
continues to rise the strength of permeable bricks continue
to increase. Correspondingly, with the increase of sinter-
ing temperature, the permeability coefficient of permeable
bricks gradually decreases, when the sintering temperature
is 1135°C the permeability coefficient is 1.89×10–2cms–1,
which meets the requirements of the Chinese standard
permeability grade B[Chinese standard GB/T 25993-
2010]. When the temperature exceeds 1145°C, the per-
meability coefficient of permeable bricks no longer meets
the requirements. According to the influence law of sin-
tering temperature on permeable bricks and the relevant
standards of permeable brick performance, the range of
sintering temperature of permeable bricks was selected as
1130~1145°C.
According to the sintering temperature of 1135°C, the
sintering time was set to 20 min, 30 min, 40 min, 50 min,
and 60 min to investigate the effect of different sintering
times on the flexural strength and permeability coefficients
of sintered permeable bricks and the results are shown in
Figure 5.
As shown in Figure 5, with the increase in sintering
time, the flexural strength and permeability coefficient
of permeable bricks present the same trends as those pre-
sented when the molding pressure and sintering tempera-
ture increase. When the sintering time exceeds 30 min,
the flexural strength of permeable bricks reaches 3.04MPa,
and the permeability coefficient reaches 1.77×10–2cms–1
to meet the index requirements of Chinese standard flex-
ural strength Rf3.0 and permeability class B. With the
increase of sintering time, the flexural strength of perme-
able bricks increases, and the water permeability coefficient
gradually decreases. When the sintering time is 60 min, the
water permeability coefficient of water permeable brick is
0.76×10–2cms–1, which does not meet the standard require-
ments. This is caused by the fact that with the increase of
sintering time, the internal energy of tailings regeneration
aggregate in permeable bricks continues to increase, and
the excessively high internal energy can not only change
the physical composition of tailings, but also convert the
1 1.5 2 2.5 3 3.5 4
0
1
2
3
4
5
6
7
Forming pressure/MPa
0
1
2
3
4
5
6
7
Figure 3. Results of the effect of molding pressure on the properties of permeable bricks
Flexural
strength/MPa
Permeability
coefficient/×10
-2
cms
1200°C, so that the physical phase in the sintered brick
undergoes transformation and reconstruction. The per-
meable bricks were prepared according to the molding
pressure of 3MPa. The sintering temperatures were set at
1100°C, 1110°C, 1120°C, 1125°C, 1135°C, 1145°C and
1150°C, respectively. To investigate the effects of different
sintering temperatures on the splitting tensile strength and
permeability coefficient of tailings-based sintered perme-
able bricks, and the results were shown in Figure 4.
As can be seen from Figure 4, with the increase of
temperature, the splitting flexural strength of permeable
bricks continues to rise, when the sintering temperature
reached 1135 °C, the flexural strength of permeable bricks
is 3.65 MPa, meeting the requirements of the Chinese
standard flexural strength Rf3.0 indicators, the temperature
continues to rise the strength of permeable bricks continue
to increase. Correspondingly, with the increase of sinter-
ing temperature, the permeability coefficient of permeable
bricks gradually decreases, when the sintering temperature
is 1135°C the permeability coefficient is 1.89×10–2cms–1,
which meets the requirements of the Chinese standard
permeability grade B[Chinese standard GB/T 25993-
2010]. When the temperature exceeds 1145°C, the per-
meability coefficient of permeable bricks no longer meets
the requirements. According to the influence law of sin-
tering temperature on permeable bricks and the relevant
standards of permeable brick performance, the range of
sintering temperature of permeable bricks was selected as
1130~1145°C.
According to the sintering temperature of 1135°C, the
sintering time was set to 20 min, 30 min, 40 min, 50 min,
and 60 min to investigate the effect of different sintering
times on the flexural strength and permeability coefficients
of sintered permeable bricks and the results are shown in
Figure 5.
As shown in Figure 5, with the increase in sintering
time, the flexural strength and permeability coefficient
of permeable bricks present the same trends as those pre-
sented when the molding pressure and sintering tempera-
ture increase. When the sintering time exceeds 30 min,
the flexural strength of permeable bricks reaches 3.04MPa,
and the permeability coefficient reaches 1.77×10–2cms–1
to meet the index requirements of Chinese standard flex-
ural strength Rf3.0 and permeability class B. With the
increase of sintering time, the flexural strength of perme-
able bricks increases, and the water permeability coefficient
gradually decreases. When the sintering time is 60 min, the
water permeability coefficient of water permeable brick is
0.76×10–2cms–1, which does not meet the standard require-
ments. This is caused by the fact that with the increase of
sintering time, the internal energy of tailings regeneration
aggregate in permeable bricks continues to increase, and
the excessively high internal energy can not only change
the physical composition of tailings, but also convert the
1 1.5 2 2.5 3 3.5 4
0
1
2
3
4
5
6
7
Forming pressure/MPa
0
1
2
3
4
5
6
7
Figure 3. Results of the effect of molding pressure on the properties of permeable bricks
Flexural
strength/MPa
Permeability
coefficient/×10
-2
cms