Optimized development of steel slag tailings-GGBS based low-cost backfill material
DAI Meng-bo1, LUO Bang-cao1, SUN Cai-hong1, TIAN Hao1, SUN Ye-chang2, CHUN Tie-jun1
1. School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243002, Anhui, China; 2. Magang Group Design and Research Institute, Masteel Group Holding Co., Ltd., Ma′anshan 243000, Anhui, China
Abstract：In order to realize the synergistic utilization of wastes and reduce the backfill cost, this paper took the GGBS-based fine unclassified tailings cemented backfill material as the benchmark, and the flow of backfill slurry and backfill strength as the characteristics to carry on research. For developing of steel slag tailings-GGBS based soft mine backfill material, solid materials ratios were optimized. Hot stuffy steel slag magnetic selection tailings (steel tailings) were used to replace part of the GGBS as cemented material, while desulfurization ash and cement clinker replaced part of the special additive as admixtures. The orthogonal experiments were used to explore the mixing rules, and the influences of cement-sand ratio and the ratio of admixtures to binder were also researched. The micromorphology and XRD maps for backfills of GGBS-based, steel tailings-GGBS based (B1) and steel tailings-slag group with optimum strength admixture(B7) based were analyzed to explore their hydration mechanisms. The results show that with the increase of slag replaced by steel tailings and the decrease of admixture to binder ratio, the backfill strength decreases and the flow of backfill slurry improves. Strength orthogonal experimental results show that the strength is determined by content of steel tailings, and mixing content of desulfurization ash should be more than cement clinker. Under the condition of 1:6 cement-sand ratio and 20% replacement ratio of steel tailings to GGBS, the proportion of admixtures was further adjusted. The optimized admixtures of B7 were that desulfurization ash and cement clinker replaced special additive by 30% and 20%, respectively, the flow was 143 mm, and micromorphology was iron-rich chlorite cemented false cube crystalline wollastonite. The backfill strength was 2.13 MPa in 28 days, which was 0.19 MPa lower than that of GGBS-based group and 0.26 MPa higher than that of B1. The replaced alternative scheme meets the application requirement of C2 strength, which increases flow and reduces backfill costs significantly. The optimal admixture also has strength optimization effect at 1:4 cement-sand ratio but it is worse than 1:6 cement-sand ratio.
代梦博, 罗邦曹, 孙彩虹, 田浩, 孙业长, 春铁军. 低成本钢尾渣-矿渣基矿山充填料的优化开发[J]. 钢铁, 2022, 57(2): 175-184.
DAI Meng-bo, LUO Bang-cao, SUN Cai-hong, TIAN Hao, SUN Ye-chang, CHUN Tie-jun. Optimized development of steel slag tailings-GGBS based low-cost backfill material[J]. Iron and Steel, 2022, 57(2): 175-184.
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