不同物料配比充填料浆流变性的体积浓度效应  

Volume Concentration Effect on Rheology of Filling Slurry with Different Material Ratios

作　　者：黄振华 李翠平[1] 李雪 阮竹恩 王少勇[1,3] HUANG Zhenhua;LI Cuiping;LI Xue;RUAN Zhuen;WANG Shaoyong(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Shunde Innovation School of University of Science and Technology Beijing,Foshan 528399,Guangdong,China;Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]北京科技大学顺德创新学院,广东佛山528399 [3]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《材料导报》2023年第22期98-106,共9页Materials Reports

基　　金：国家自然科学基金(52130404);中国博士后科学基金(2021M690011);广东省基础与应用基础研究基金(2021A1515110161);北京科技大学顺德研究生院博士后科研经费(2021BH011)。

摘　　要：充填料浆中固体体积浓度与其临界体积浓度的比值(简称体积浓度比)是决定料浆流变性的重要指标,充填料浆的物料尺度、浓度、配比是影响料浆流变特性的重要因素。通过全面实验法,研究了不同的尾砂配比、砂灰比与质量分数对充填料浆流变性的影响,获取了不同物料情况下的临界体积浓度,分析了充填料浆流变性与体积浓度比的定量关系。研究表明,稳态流动下充填料浆的动态屈服应力与塑性黏度随质量分数的增大而增大,随砂灰比的增大而减小,同时在高质量分数下,尾砂配比和砂灰比的交互作用较强,充填料浆动态屈服应力与塑性黏度的波动性较大,且波动性随着砂灰比的增大而增强;进而通过将充填料浆固体体积浓度归一化为体积浓度比,充填料浆的动态屈服应力与体积浓度比呈幂函数的量化关系,而塑性黏度由于固结剂水化引起的应力传导减弱导致其与体积浓度比没有良好的量化关系,刚性尾砂颗粒的应力传导是造成料浆流变特性体积浓度效应的重要原因。The ratio of solid volume concentration to critical volume concentration in the filling slurry(referred to as volume concentration ratio)is an important factor to determine the flowability of the slurry,and the material scale,concentration,and ratio of the filling slurry are important factors affecting the rheological properties of the slurry.The effects of different tailing sand ratios,sand-cement ratios,and mass concentrations on the rheological properties of the filling slurry were investigated by a comprehensive experimental method,and the critical volume concentrations were obtained for different material cases.The quantitative relationship between the flowability of the filling slurry and the volume concentration ratio was analyzed.The results showed that the rheological parameters of the filling slurry under steady-state flow increased with increasing mass concentration and decreased with increasing sand-cement ratio.The interaction between tailing sand ratio and sand-cement ratio was stronger at high mass concentration,and the volatility of the rheological parameters of the filling slurry was larger.The volatility increased with an increasing sand-cement ratio.Further,by normalizing the filling slurry solid volume concentration to its critical volume concentration as the volume concentration ratio,it was found that the dynamic yield stress of the filling slurry was quantified as a power function of the volume concentration ratio.At the same time,the plastic viscosity did not have a good quantified relationship with the volume concentration ratio due to the weakened stress conduction caused by the hydration of the cementing agent,indicating that the stress transfer of the rigid tailing sand particles was an important cause of the volume concentration effect of the rheological properties of the slurry.

关 键 词：尾砂配比 砂灰比 体积浓度比 流变特性 级配参数 

分 类 号：TD853[矿业工程—金属矿开采]