Research Article
Effect of Desliming of Tailings on the Fresh and Hardened Properties of Paste Backfill Made from Alkali-Activated Slag
Table 1
Physical, chemical, and mineralogical properties of tailings.
| | Chemical composition | Full tailings (wt.%) | Deslimed tailings (wt.%) | Physical properties | Full tailings | Deslimed tailings |
| | SiO2 | 13.16 | 10.43 | Specific gravity (Gs) | 4.09 | 4.32 | | Al2O3 | 4.81 | 2.46 | Specific surface area (cm2/g) | 3662 | 1956 | | Fe2O3 | 48.41 | 53.93 | D10 (μm) | 2.14 | 14.98 | | MgO | 1.13 | 0.91 | D30 (μm) | 7.65 | 29.62 | | CaO | 1.83 | 1.28 | D50 (μm) | 19.21 | 45.24 | | Na2O | 0.19 | 0.18 | D60 (μm) | 28.52 | 54.23 | | K2O | 0.64 | 0.23 | D90 (μm) | 77.43 | 117.39 | | TiO2 | 0.08 | 0.07 | Coefficient of curvature (Cc) | 0.96 | 1.08 | | P2O5 | 0.02 | 0.02 | Coefficient of uniformity (Cu) | 13.33 | 3.62 | | MnO | 0.06 | 0.05 | | | | | Cr2O3 | 0.01 | <0.01 | | | | | BaSO4 | 2.54 | 2.02 | | | | | Loss on ignition | 26.9 | 28.2 | | | | | Sulphide (S−2) | 37.4 | 42.23 | | | | | Total S | 38.52 | 42.76 | | | | | Pyrite content (FeS2) | 70.13 | 79.19 | | | |
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