3562 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
illustrate that the permeable bricks of the tailings regen-
erated aggregate has an excellent pore structure, which
ensures a good permeability performance, further indicat-
ing that the use of the tailings pelletized to prepare perme-
able bricks is strongly feasible.
CONCLUSION
For this study, GT and DT were used as the primary raw
materials for the preparation of permeable bricks, and their
mechanical properties, water permeability microstructure,
and pore structure were investigated, and the following
conclusions were drawn:
1. The flexural strength of permeable bricks prepared
by GT and DT increased gradually with the form-
ing pressure, firing temperature, and firing time,
and the water permeability coefficient decreased
gradually. With the forming pressure of 3Mpa, fir-
ing temperature of 1135°C and holding time of
40 min, the split flexural strength of the prepared
permeable bricks was 3.65MPa, and the water per-
meability coefficient was 1.89×10–2cms–1 to meet
the index requirements of Chinese standard GB/T
25993-2010.
2. During the sintering process, the permeable bricks
underwent a phase transformation, generating new
phases such as Augite, Diopside, and Anorthite.
The microstructural analysis shows that with the
increase in sintering temperature, the bond of the
permeable brick surface becomes more and more
significant, increasing the densification of the per-
meable brick.
3. The pore structure and permeability of the perme-
able bricks were analyzed using industrial CT. The
total pore volume of the permeable brick samples
as a percentage of the sample volume was 11.07%,
of which the connected and closed pores accounted
for 10.62% and 0.45%, respectively, of the vol-
ume of the total sample. GT-DT permeable brick
preparation not only consumes a large amount of
industrial solid waste but also reduces traditional
sand and gravel resources, which is essential for
ecological and environmental protection and con-
structing a “sponge city.”
REFERENCE
Barcelos D A, Pontes F V M, da Silva F A N G, et al. Gold
mining tailing: Environmental availability of met-
als and human health risk assessment[J]. Journal of
Hazardous Materials, 2020, 397: 122721.
Figure 13. Results of quantitative analysis of pore structure parameters(Pore radius (a) Throat radius (b))
Table 3. Quantitative evaluation of pore and throat
structures
Number Content Result
1 Maximum pore radius 856.89μm
2 Average pore radius 273.47μm
3 Maximum throat radius 438.98μm
4 Average throat radius 83.39μm
5 Maximum throat length 9500.91μm
6 Average throat length 3270.64μm
7 Maximum coordination number 16
8 Average coordination number 0.77
illustrate that the permeable bricks of the tailings regen-
erated aggregate has an excellent pore structure, which
ensures a good permeability performance, further indicat-
ing that the use of the tailings pelletized to prepare perme-
able bricks is strongly feasible.
CONCLUSION
For this study, GT and DT were used as the primary raw
materials for the preparation of permeable bricks, and their
mechanical properties, water permeability microstructure,
and pore structure were investigated, and the following
conclusions were drawn:
1. The flexural strength of permeable bricks prepared
by GT and DT increased gradually with the form-
ing pressure, firing temperature, and firing time,
and the water permeability coefficient decreased
gradually. With the forming pressure of 3Mpa, fir-
ing temperature of 1135°C and holding time of
40 min, the split flexural strength of the prepared
permeable bricks was 3.65MPa, and the water per-
meability coefficient was 1.89×10–2cms–1 to meet
the index requirements of Chinese standard GB/T
25993-2010.
2. During the sintering process, the permeable bricks
underwent a phase transformation, generating new
phases such as Augite, Diopside, and Anorthite.
The microstructural analysis shows that with the
increase in sintering temperature, the bond of the
permeable brick surface becomes more and more
significant, increasing the densification of the per-
meable brick.
3. The pore structure and permeability of the perme-
able bricks were analyzed using industrial CT. The
total pore volume of the permeable brick samples
as a percentage of the sample volume was 11.07%,
of which the connected and closed pores accounted
for 10.62% and 0.45%, respectively, of the vol-
ume of the total sample. GT-DT permeable brick
preparation not only consumes a large amount of
industrial solid waste but also reduces traditional
sand and gravel resources, which is essential for
ecological and environmental protection and con-
structing a “sponge city.”
REFERENCE
Barcelos D A, Pontes F V M, da Silva F A N G, et al. Gold
mining tailing: Environmental availability of met-
als and human health risk assessment[J]. Journal of
Hazardous Materials, 2020, 397: 122721.
Figure 13. Results of quantitative analysis of pore structure parameters(Pore radius (a) Throat radius (b))
Table 3. Quantitative evaluation of pore and throat
structures
Number Content Result
1 Maximum pore radius 856.89μm
2 Average pore radius 273.47μm
3 Maximum throat radius 438.98μm
4 Average throat radius 83.39μm
5 Maximum throat length 9500.91μm
6 Average throat length 3270.64μm
7 Maximum coordination number 16
8 Average coordination number 0.77