ABSTRACT

Unreasonable choice of solid content (SC) and cement-to-tailings ratio (c/t), including pipeline networking system, will lead to some pipeline problems, such as blockage, wear, and rupture. Hence, this study deals with the rheology and sedimentation characteristics of fresh CTB slurry. Samples having a SC value of 65, 67 and 69wt.%, as well as a c/t ratio of 1:2, 1:1 and 1:4, were prepared and exposed to their rheological tests. Likewise, the sedimentation properties of CTB slurry was studied by picking polyacrylamide (PAM) as flocculant. Results showed that: (1) CTB’s slump reduced with growing SC and c/t values when SC was kept constant. (2) The viscosity and shear stress increased with increasing SC values, signifying a linear link between shear stress and stress rate. (3) There was also an exponential link between sedimentation rate and PAM flocculant content in CTB. When PAM value increased from 75 to 80 g/t, a clear difference was observed in the clarification layer height (CLH). The CLH increments were also 7.5 and 7.14% for a ST of 20 and 30 min, respectively. Finally, this work will greatly contribute to the mining industry in assessing the transport aspect of CTB slurry to underground mined-out stopes.

摘要

固含量（SC）和水泥与尾料比（c / t）的不合理选择（包括管道网络系统）将导致某些管道问题，例如阻塞，磨损和破裂。因此，本研究涉及新鲜CTB浆液的流变和沉降特性。制备具有65、67和69wt。％的SC值以及ac / t比为1：2、1：1和1：4的样品，并进行流变测试。同样，通过选择聚丙烯酰胺（PAM）作为絮凝剂，研究了CTB浆液的沉降特性。结果表明：（1）当SC保持恒定时，CTB的坍落度随SC和c / t值的增加而降低。（2）粘度和剪切应力随SC值的增加而增加，表明剪切应力与应力率之间存在线性关系。（3）沉积速率与CTB中PAM絮凝剂含量之间也存在指数关系。当PAM值从75g / t增加到80g / t时，在澄清层高度（CLH）上观察到明显的差异。对于20分钟和30分钟的ST，CLH增量分别为7.5％和7.14％。最后，这项工作将对评估CTB泥浆到地下采空场的运输方面做出很大的贡献。