Effect of Desliming of Tailings on the Fresh and Hardened Properties of Paste Backfill Made from Alkali-Activated Slag
Table 2
Chemical, physical, and mineralogical properties of binders.
Chemical composition
OPC (wt.%)
Slag (wt.%)
Physical properties
OPC
Slag
SiO2
21.88
39.75
Specific gravity
3.07
2.89
Al2O3
4.74
10.91
Specific surface area (cm2/g)
4120
4600
Fe2O3
2.90
0.80
Retained on 45 μm sieve (%)
2.17
4.15
CaO
65.0
38.02
Retained on 32 μm sieve (%)
7.48
9.60
MgO
1.40
5.92
Mineralogical composition (%)
TiO2
0.19
0.51
C3S
50.42
–
Cr2O3
0.01
0.01
C2S
27.76
–
Na2O
0.39
0.32
C3A
7.66
–
K2O
0.75
1.19
C4AF
8.83
–
MnO
0.12
1.54
Basicity index
P2O5
0.06
<0.01
–
1.03
Free lime
1.04
–
Loss on ignition
2.5
0.20
SO3
2.67
1.62
Reactive SiO2
–
39.10
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