Experimental study on the ratio between ti-bearing blast furnace slag-iron-based full tailing sand and cement in cementitious filling
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摘要: 为研究提钛炉渣替换水泥全尾砂胶结充填体的最佳配比及力学性能，以提钛炉渣(TBS)、铁基全尾砂(IFT)和水泥(P.O 42.5R)为实验材料，在分析该提钛炉渣的粒径级配组成、成分等物理化学特性的基础上，制备灰砂比1∶4、1∶6、1∶8和提钛炉渣掺入替换比为40%、50%、60%、70%、80% 的充填体试样，测定了养护龄期分别为7 d、14 d和28 d时的充填体单轴抗压强度。实验结果表明：充填体的抗压强度与养护期龄正相关；相同养护时间下，充填体的单轴抗压强度随着灰砂比的增大而增大；随提钛炉渣替换比增大，充填体28 d强度先增大后减小；当提钛炉渣替换比为50% 时，灰砂比1∶8、1∶6、1∶4的充填体28 d抗压强度分别为1.8 MPa、2.5 MPa、4.0 MPa，均超过未添加提钛炉渣的试块强度，表明掺入提钛炉渣对充填体的28 d强度具有明显的提升作用。研究结果表明，提钛炉渣可开发为矿山充填胶凝材料，从而降低矿山充填成本。Abstract: This study investigated the optimal ratio and mechanical properties of iron-based full tailing sand(IFT)and cement(P.O42.5R)as experimental materials, with the addition of the Ti-bearing Blast Furnace Slag(TBS), in full tailing sand cemented filling material. The physical and chemical properties of TBS, including particle size gradation composition and chemical composition, were analyzed. Filling specimens were prepared with sand-cement ratios of 1∶4, 1∶6, and 1∶8, and TBS replacement ratios of 40%, 50%, 60%, 70%, and 80%. The uniaxial compressive strength of the filling specimens was measured after curing for 7, 14, and 28 days. The experimental results demonstrated a positive correlation between the compressive strength of the filling and the curing time. Additionally, under the same curing time, the uniaxial compressive strength of the filling increased with the increase of the sand-cement ratio. With an increase in the replacement percentage of TBS, the strength of the filling initially increased and then decreased at 28 days. Notably, when the TBS replacement ratio was 50%, the compressive strength of the filling with ratios of 1∶8, 1∶6, and 1∶4 after 28 days of curing was 1.8 MPa, 2.5 MPa, and 4.0 MPa, respectively. All of these values exceeded the strength of the specimens without TBS, indicating that the addition of TBS significantly improved the compressive strength of the filling at 28 days. The research results demonstrate that TBS can be developed as a cementitious material for mine backfill, thereby reducing the cost of mine filling.
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图 4 提钛炉渣替换比对充填体强度的影响
Figure 4. Effect of TBS replacement ratio on the strength of filling body
图 5 不同灰砂比各期龄抗压强度
Figure 5. Compressive strength of different lime and sand ratios at different age
图 7 两因素交互作用下对单轴抗压强度的影响
Figure 7. Influence of two factors on uniaxial compressive strength
表 1 化学成分分析结果
Table 1. Results of chemical composition analysis
CaO MgO MnO SiO2 TiO2 Al2O3 SO3 Fe2O3 TiC Na2O TiN Cl ω(IFT)/% 12.7 9.20 0.181 37.49 4.355 13.2 1.01 13.24 — 0.98 — 0.026 ω(TBS)/% 26.52 8.78 0.71 25.3 5.98 13.15 0.98 — 2.75 — 0.98 3.28 
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表 2 抗压强度实验结果
Table 2. Compressive strength test results
编号 提钛炉渣掺入比例/% 水泥掺入比例/% 灰砂比 7 d抗压强度/MPa 14 d抗压强度/MPa 28 d抗压强度/MPa 1 0 100 1∶4 1.43 2.90 3.33 2 40 60 1.23 2.23 3.67 3 50 50 1.30 2.67 4.00 4 60 40 1.53 2.73 3.60 5 70 30 1.23 2.10 2.63 6 80 20 0.60 0.90 1.67 7 0 100 1∶6 1.07 1.53 1.67 8 40 60 0.87 1.17 1.80 9 50 50 0.93 1.27 2.50 10 60 40 0.80 1.07 1.97 11 70 30 0.77 0.93 1.90 12 80 20 0.60 0.60 1.40 13 0 100 1∶8 1.03 0.90 0.97 14 40 60 0.89 1.10 1.63 15 50 50 0.80 1.03 1.77 16 60 40 0.83 1.03 1.73 17 70 30 0.60 0.70 1.23 18 80 20 0.00 0.00 0.73
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表 3 方差分析结果
Table 3. ANOVA results
误差来源 平方和 自由度 均方 F值 P值 评价 模型 8.900 6 1.480 7.390 0.003 显著 A 4.160 1 4.160 20.710 0.001 — B 3.860 1 3.860 19.230 0.001 — C 0.035 1 0.035 0.175 0.685 — AB 0.748 1 0.748 3.720 0.083 — AC 0.014 1 0.014 0.072 0.794 — BC 0.081 1 0.081 0.404 0.539 — 残差 2.010 10 0.201 — — — 失拟值 1.300 6 0.217 1.230 0.440 不显著 自然误差 0.706 4 0.177 — — — 相关系数和 10.910 16 — — — —
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