超细全尾砂料浆大流量输送特性基础理论研究

This project mainly discuss the core technology ensuring the balance between mining and filling that fluorescence transport of filling slurry , which aims at studying the basic theory of ultrafine unclassified tailings for bulk transfer. The action mechanism of ultrafine tailings was uncovered in the in pipe flow, based on the research of Influence law in the filling slurry rheological properties on ultrafine tailings, with rheology theory and rheological experiment. The interaction and movement mechanism between particles and carrier was revealed, according to the motion in the pipeline on the particles, based on the element tracking principle and Industrial computed tomography (CT) scanning technology, and the classification basis of slurry flow pattern was proposed. The models of resistance loss and critical flow velocity were set up with the considering on the effect of pipe diameter and 3T effect, simplifying and amending the models with loop test and numerical simulation, examining the reliability of the models on the basis of statistical theory and big data principle. The equilibrium value between pipe diameter and velocity was confirmed to implement fluorescence transport with ultrafine unclassified tailings and ensure the balance between Large-scale mining cooperating with filling

本项目紧密围绕充填料浆大流量输送是保证大规模采矿与充填有效协同的核心技术展开，旨在探讨超细全尾砂料浆大流量输送特性基础理论研究。项目以流变学理论为基础结合相关实验手段，通过研究超细尾砂对充填料浆流变特性的影响规律，揭示超细尾砂在管流中的作用机理；应用元素追踪原理和工业CT扫描技术找出料浆管道输送中颗粒的运动规律，揭示料浆中颗粒与载体之间的相互作用及运动机理，提出超细全尾砂料浆大流量输送流动形态的分类依据；基于料浆颗粒作用机理与运动规律，结合流变学理论建立考虑管径效应和3T效应的阻力损失和临界流速计算模型，采用室内环管试验与数值模拟技术修正与简化模型，应用统计学理论与大数据原理检验模型可靠性；应用线性规划原理结合阻力损失与临界流速计算模型，分析管径与流速的平衡关系，找到二者平衡值，实现超细全尾砂料浆大流量输送，保证大规模采矿与充填有效协同。

项目围绕尾砂变细与流量增大这两个充填现场实际问题，针对超细全尾砂充填料浆大流量管道输送工艺环节开展了相关研究。首先，借助温控式流变仪与环境扫描电镜（ESEM），开展了超细全尾砂充填料浆的流变特性研究，进而分析了超细全尾砂浆的流变模型、流变参数、以及流变微观机理；第二，借助数值模拟与电阻层析成像（ERT）物理实验，探明了超细全尾砂浆在大流量管输条件下的流动形态、浓度分布、流速分布等特征；第三，研究了料浆管输过程中的3T效应，并针对超细全尾砂浆的触变性开展了相关探究，构建了超细全尾砂浆触变性预测模型，提出了整个管输过程中料浆触变总量的测试方法；第四，针对超细全尾砂浆的流变特性与3T效应，构建了考虑料浆触变与壁面滑移的超细全尾砂浆管输阻力模型，并探讨了模型的适用性；最后，以大流量管道输送为背景，开展了管径与流速的平衡关系研究，运用COMSOL软件进行数值模拟，分别探讨了温度/管径/初始流速对管流速度场的影响规律。项目取得了丰富的理论成果，能够对矿山充填现场提供一定的理论指导。