全尾砂-人工砂结构流体胶结充填配比优化

Mixture Optimization of Cemented Backfill with Unclassified Tailings-Artificial Sand Structure Fluid

针对贵州某金矿矿体及围岩在断层和裂隙带中产出、易垮塌且遇水泥化等问题,分别设计了单轴压力机试验与环管试验,对全尾砂-人工砂结构流体胶结充填的充填体强度和充填料浆流动性能进行检验与分析。单轴压力机试验结果表明：在打底充填中,料浆质量浓度为75%~76%、水泥掺量为20%、人工砂与尾砂质量比为2.9时为最优配比;在非打底充填中,质量浓度为75%~76%、水泥掺量为12%、人工砂与尾砂质量比为2.9时为最优配比。该金矿在370 m水平充填倍线最大,为5.7。经过环管试验测定并分析,在2种最优配比情况下,充填料浆均可以实现自流输送。

In view of such problems as the ore and surrounding rock existing in faults and fissures,easy collapse and sliming in a gold mine of Guizhou,the uniaxial compressive strength（ UCS） tests and pumping loop-pipe-tests were designed to analyze the strength and fluidity of unclassified tailings-artificial sand cemented backfill slurry. The test results of uniaxial compressive strength（ UCS） shows that slurry concentration being 75 % ~ 76 %,cement dosage being 20 % and mass ratio of artificial sand to tailing being 2. 9 is the optimal in the bottom of filling,while slurry concentration being 75 % ~ 76 %,cement dosage 12 % and mass ratio of artificial sand to tailing 2. 9 is the optimal in the other part. The maximum stowing gradient in this gold mine is 5. 7 in 370 m level. Through the pumping loop-pipe-tests,self-flowing transportation for the filling slurry can be achieved at two kinds of optimal ratios.