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金矿尾矿胶结充填用胶凝材料的制备及其性能表征

Preparation and Performance Characterization of the Cemented Filling Materials of Gold Mine Tailings

  • 摘要: 以矿渣微粉、水泥(P.O 42.5)、粉煤灰、氧化钙和硫酸钙为原料制备早强型尾矿胶结胶凝材料(尾矿胶结料),将尾矿胶结料用于胶结充填中位直径D50为11.3 µm的金矿细粒尾矿,表征分析充填试样的力学性能与流动性能。结果表明:相同胶砂质量比和尾矿浆固含量下,用尾矿胶结料胶结固化尾矿的效果优于P.O 42.5水泥;胶砂质量比1:12时,充填试样28 d抗压强度为P.O 42.5水泥的4.9倍,尾矿胶结料的水化产物量高于P.O 42.5水泥;尾矿胶结料的胶砂质量比为1:6、尾矿浆固质量分数为70%时,加入0.15%(质量分数)聚羧酸减水剂的充填料浆坍落度为278 mm,其力学性能和充填流动性能均可满足矿山充填要求。

     

    Abstract: The early strengthened type binding materials (ESBM) were prepared by using the blast furnace slag powder, P.O 42.5 cement, fly ash, calcium oxide and calcium sulfate as raw materials. The ESBM as binders were used to cement the fine gold mine tailings (FGMT) with median diameter D50 of 11.3 µm. The mechanical behavior and fluidity of the filling specimen were characterized and analyzed. The results show that the binding effect of ESBM on the FGMT is better than that of P.O 42.5 cement under the same mass ratio of binder to FGMT and content of solid FGMT slurry. At mass ratio of binder to FGMT being 1:12, the 28 d compressive strength of the filling specimen is 4.9 times of that for P.O 42.5 cement the amount of the hydration products of ESBM is more than that of P.O 42.5, cement. When the mass ratio of binder to FGMT is 1:6 and the mass fraction of solid FGMT slurry is with 70%, the slump of filling FGMT slurry is 278 mm for the specimen of the adding water reducer of polycarboxylic acid with 0.15% (mass fraction), and the compressive strength and fluidity can satisfy the requirement of filling.

     

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