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Effect of Desliming of Tailings on the Fresh and Hardened Properties of Paste Backfill Made from Alkali-Activated Slag
Advances in Materials Science and Engineering ( IF 2.098 ) Pub Date : 2020-06-08 , DOI: 10.1155/2020/4536257
Ferdi Cihangir 1 , Yunus Akyol 1
Affiliation  

Cemented paste backfill (CPB) allows environmental friendly management of potentially hazardous tailings generated from milling of nonferrous metal sulphide ores by placing such tailings into the underground mined-out openings. The components of CPB are tailings, water, and binders. These components significantly affect the physicomechanical, workability, and geotechnical properties of CPB. Ordinary Portland cement (OPC) is the commonly used binder for CPB operations. The effects of the tailings characteristics and OPC are extensively studied in the study area. The beneficial effect of the use of alkali-activated slags (AASs) on the mechanical and durability properties of CPB of sulphide-rich tailings has been recently reported. Therefore, this study especially focused on the effect of desliming of the tailings on the workability properties of sulphide-rich tailings CPB containing AAS besides hardened properties. In this scope, the water-retention capacities of full (FT) and deslimed tailings (DT) and the workability characteristics of CPB mixtures were studied. DT was found to decrease the water-retention capacity, leading to denser CPB mixtures. In addition, DT-AASs usage produced no adverse effect on the workability of fresh CPB materials. LSS-S (slag activated with liquid sodium silicate) improved the flowability of CPB mixtures owing to its dispersant effect. Desliming also modified the tailing properties by removing fine particles and improved the main geotechnical parameters of CPB.

中文翻译:

尾矿去泥对碱活化矿渣糊回填的新鲜和硬化性能的影响

水泥浆回填(CPB)可通过将有色尾矿放入地下采空区,从而对由有色金属硫化矿石的研磨产生的潜在危险尾矿进行环境友好的管理。CPB的成分是尾矿,水和粘合剂。这些组件会严重影响CPB的物理力学,可加工性和岩土性能。普通波特兰水泥(OPC)是CPB操作中常用的粘结剂。尾矿特性和OPC的影响已在研究区域中广泛研究。最近已经报道了使用碱活化炉渣(AAS)对富含硫化物的尾矿的CPB的机械和耐久性能的有益影响。因此,这项研究尤其侧重于尾矿脱泥对含有AAS的富含硫化物的尾矿CPB的加工性能以及硬化性能的影响。在此范围内,研究了全(FT)和脱泥尾矿(DT)的保水能力以及CPB混合物的可加工性特征。发现DT降低了保水能力,导致CPB混合物更稠密。此外,DT-AAS的使用对新鲜CPB材料的可加工性没有不利影响。LSS-S(用液态硅酸钠活化的炉渣)由于其分散作用而提高了CPB混合物的流动性。除泥还通过去除细颗粒来改善尾矿性质,并改善了CPB的主要岩土参数。研究了全(FT)和除泥尾矿(DT)的保水能力以及CPB混合物的可加工性。发现DT降低了保水能力,导致CPB混合物更稠密。此外,DT-AAS的使用对新鲜CPB材料的可加工性没有不利影响。LSS-S(用液态硅酸钠活化的炉渣)由于其分散作用而提高了CPB混合物的流动性。除泥还通过去除细颗粒来改善尾矿性质,并改善了CPB的主要岩土参数。研究了全(FT)和除泥尾矿(DT)的保水能力以及CPB混合物的可加工性。发现DT降低了保水能力,导致CPB混合物更稠密。此外,DT-AAS的使用对新鲜CPB材料的可加工性没有不利影响。LSS-S(用液态硅酸钠活化的炉渣)由于其分散作用而提高了CPB混合物的流动性。除泥还通过去除细颗粒来改善尾矿性质,并改善了CPB的主要岩土参数。DT-AAS的使用对新鲜CPB材料的可加工性没有不利影响。LSS-S(用液态硅酸钠活化的炉渣)由于其分散作用而提高了CPB混合物的流动性。除泥还通过去除细颗粒来改善尾矿性质,并改善了CPB的主要岩土参数。DT-AAS的使用对新鲜CPB材料的可加工性没有不利影响。LSS-S(用液态硅酸钠活化的炉渣)由于其分散作用而提高了CPB混合物的流动性。除泥还通过去除细颗粒来改善尾矿性质,并改善了CPB的主要岩土参数。
更新日期:2020-06-08
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