新型胶凝材料对全尾砂固结堆体稳定性的影响

Effect of New Type Cementitious Materials on Stability of Unclassified Tailings-cemented Heap

通过实验室正交试验、数值模拟等方法,对全尾砂固结排放过程中掺入的新型胶凝材料T.C的合理配比及其对堆体稳定性影响进行研究。以矿渣、石灰、石膏、硫铝水泥、孰料作为胶凝材料的原材料,通过正交试验得到各因素对固结体强度的影响大小依次为矿渣、石灰、硫铝水泥、石膏,并得到全尾砂新型胶凝材料T.C的最佳配比:矿渣∶石灰∶石膏∶硫铝水泥∶孰料=70∶6∶10∶4∶10。借助全面试验,对比普通硅酸盐水泥(P.O.42.5)、矿渣水泥(P.S.32.5)以及新型全尾砂胶凝材料T.C作用下固结体强度变化趋势,发现无论是早期强度还是后期强度,新型全尾砂胶凝材料T.C的固结效果要明显优于普通硅酸盐水泥与矿渣水泥。基于强度折减法并借助FLAC3D对堆体的稳定性进行分析,从而建议堆体的高度应小于50 m、堆排角小于60°、料浆浓度取76%~78%、灰砂比为1∶12~1∶9。

The reasonable ratio of T.C,a new type cementitious material,incorporated into the unclassified tailings-cemented process,and its effect on the stability of the heap are investigated by laboratory orthogonal test,numerical simulations and other methods.The slag,lime,gypsum,sulfoaluminate cements and clinker are used as raw materials for cementitious materials.The influencing level of various factors on the strength of the cemented body are listed as slag,lime,sulphur-aluminum cement,gypsum by the orthogonal test,and the best ratio of the new type eementitious material T.C shows like slag:lime:gypsum:sulfoaluminate cement:clinker of 70:6:10:4:10.A comprehensive comparison on the strength of consolidated cement bodies is carried out under the action of ordinary portland cement (P.O.42.5),slag cement(P.S.32.5),and new type cementitious material T.C.It was found that the effect of the new type cementitious material T.C is obviously better than that of ordinary portland cement and slag cement in early strength and late strength.Based on the strength reduction method and FLAC3D,the stability of the heap is analyzed.And it is suggested that the height of the heap should be less than 50m,the stacking angle be less than 60°,the slurry concentration be between 76%and 78%,and the ratio of cement to sand be between 1:12and 1:9.