Investigation on Mechanical Characteristics and Microstructure of Cemented Whole Tailings Backfill
Investigation on Mechanical Characteristics and Microstructure of Cemented Whole Tailings Backfill
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DOI：
10.3390/min11060592
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发表时间：
2021-06-01
期刊：
影响因子：
2.5
通讯作者：
Wang, Leiming
中科院分区：
文献类型：
--
作者：
Belibi Tana, Armelle Estelle;Yin, Shenghua;Wang, Leiming
膏体回填的性能主要可以通过所涉及组件的机械和物理特性来评估。研究了固体组分尾砂、胶结剂和含水率对无胶结全尾砂充填体(CWTB)混合料微观结构演变和力学性能的影响。选择1、3和5wt.%的普通硅酸盐水泥和72wt.%、74wt.%和75wt.%的固体浓度的不同混合料，进行流变性试验，确定坍落度和屈服应力。分别用扫描电子显微镜和X射线衍射仪分析了制备前后固相组分的微观结构和化学成分。结果表明，CWTB浆体的屈服应力与坍落度呈正相关，流动稠度的降低导致CWTB混合料的含水率降低，浆体的流动阻力降低。在固含量最高的情况下，CWTB的无侧限抗压强度在0.1-0.9 Mpa之间变化。增加固含量会影响CWTB混合料的孔隙率，提高其强度抗力。因此，这项研究的结果可以让我们得出这样的结论，即CWTB的化学成分似乎是胶结膏体充填(CPB)设计和采矿作业中的一个重要因素。
A paste backfill performance can be primarily evaluated through the mechanical and physical characteristics of the components involved. In this study, the effects of solid components' tailings, binders and waters contents on microstructural evolution and mechanical properties of uncemented whole tailings backfill (CWTB) mixtures were investigated. Different mixtures of ordinary Portland cement of 1, 3 and 5 wt. % and solid concentrations at 72 wt. %, 74 wt. % and 75 wt. % were selected and rheological test was conducted to define the slump fluidity and yield stress. The microstructure of the solid component before and after the preparation and chemical composition were analyzed by the Scanning electron microscope and XRD analysis, respectively. The results show that a positive correlation between yield stress and slump values of CWTB paste slurries, the decrease of flow consistence leads to the reduction of the water content on the CWTB mixtures and the flow resistance of the paste. With the highest solids content, unconfined compressive strength (UCS) of CWTB varies between 0.1-0.9 MPa. Increasing the solid content affects the porosity and improves the strength resistance of CWTB mixtures. The findings in this study can therefore lead us to a statement that CWTB chemical components seem to be an important factor in cemented paste backfill (CPB) design and mine operations.