剪切强化煤泥浮选调浆的作用机理及调控研究

项目名称： 剪切强化煤泥浮选调浆的作用机理及调控研究

项目编号： No.51504262

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 矿业工程

项目作者： 黄根

作者单位： 中国矿业大学（北京）

项目金额： 21万元

中文摘要： 调浆过程中流体的剪切是影响调浆效果重要的因素之一，剪切可以促进药剂的分散和药剂在颗粒表面的吸附以及颗粒之间的选择性疏水絮凝，但过度的剪切会造成泥化，降低浮选效果。因此，深入研究剪切对煤泥浮选调浆的强化机理及其调控机制对于实现煤泥高效调浆具有重要的意义。本项目从流体动力学的角度出发，首先通过PIV技术和数值模拟方法研究不同结构和操作参数时宏观和微观流场特征参数的变化，分析影响流体剪切率场和速度场分布的主要结构操作参数并建立相应的调控模型；然后研究不同剪切流场时调浆的界面行为及其浮选过程动力学，分析流体剪切率和速度对调浆界面行为的影响及其作用机理，建立基于颗粒性质、流体剪切率和流体速度的界面行为调控模型。最后通过对界面行为和流场动力学参数的调控，实现对调浆过程强化机理的调控。本研究从流场特性和界面行为揭示了浮选调浆强化机理并建立调控模型，为煤泥浮选调浆过程设计和优化建立了理论和流态化基础。

中文关键词： 剪切；浮选调浆；界面行为；流场特性；煤泥

英文摘要： As an important factor, fluid shear force can improve the hydrophobic flocculation of coal particles, the dispersion of collector agents and its adsorption on coal particles during flotation conditioning. But excessive shear may result in sliming and reduce the flotation effect. Therefore, further study the impact of fluid shear rate on the mechanism of conditioning and its regulation has very important significance for flotation conditioning. This project researches form fluid dynamic parameters. Characteristic parameters in macro and micro flow field will be studied by the PIV technology and numerical simulation under different structure and operation parameters and the control model of the fluid shear and velocity with the main structure and operation parameters will be established. Then the effect of the fluid shear rate and velocity of flow field on interfacial behavior and flotation process will be explored. The relationship model of agent dispersion, adsorption and particle selective agglomeration with the characteristic parameters will be established by the analysis of conditioning mechanism. Based on the particle characterization, fluid shear force and velocity, the control equation of interfacial behavior will be built to control the conditioning process. This study reveals the agitation mechanism form flow field characteristics and interfacial behavior, constructing the theoretical and fluid dynamic basis for design and optimization on conditioning process.

英文关键词： shear force;flotation conditioning;interfacial behavior;flow field characteristics;coal slime