磁化对矿浆物理化学性能的影响及应用基础研究

Water is the main carrier and participant in the process of mineral flotation. It has been determined that the physical and chemical properties of water could be effectively changed by magnetization. The slurry water, containing a large number of charged particles and groups which could be easily influenced by Lorenz effect, would be magnetized to change the hydrogen bonds between water molecules. As a result, the physical and chemical properties of slurry water could be effected greatly. Unfortunately the understanding of the properties is insufficient. In this project the adjustment rules of magnetic parameters on physical and chemical properties of slurry with magnetite or prite system will be revealed through a systematic study. Then by use of magnetic field detection technology and magnetic field simulation method, we will try to set up the mathematical models of surface tension, viscosity, conductivity, dissolved oxygen concentration, mineral contact angle influencing by magnetic field strength and magnetic field gradient, magnetization time, and form the control technology of magnetic composite field for controlling the physical and chemical properties of slurry by extra magnetic field. Subsequent design standards for separation equipment with compound roles of magnetic separation and floatation will be proposed, and the green and energy-saving separation theory for the compound roles will be constructed, The project will help us to enhance the understanding of magnetization theory for slurry, and to promote the research and development of new type mineral flotation devices.

水是浮选过程中主要的载体和反应参与者，研究表明通过磁化可以有效改变水的物理化学性质；尤其在矿浆体系中存在大量易受洛伦兹力影响的带电粒子和基团的情况下，水分子之间的氢键作用受磁场发生改变，从而显著影响矿浆中水的物理化学性质，但目前对于这种性质的认识很不足。项目拟通过系统研究分别以磁铁矿和黄铁矿为表征的矿浆体系物理化学性质影响，揭示磁场参数对其变化的调控规律，利用磁场检测技术与磁场仿真手段，建立起磁场强度、磁场梯度、磁化时间对矿浆表面张力、运动粘度、电导率、溶氧度、矿物接触角、动电位等影响规律的数学模型，形成利用外加磁场实现对矿浆物理化学性质调控的磁场控制技术，继而提出磁-浮复合力场分离设备的设计标准，构建磁-浮复合力场绿色节能分离理论。项目的实施将有利于增强对于矿浆磁化的理论认识，并对新型矿物浮选设备的研发起到积极的作用。

研究了外加磁场存在对静态水的电导率影响，磁化水对矿物的表面接触角存在增大效应，随着四种水介质（超纯水、自来水、软水、硬水）中的离子强度增加，测试表明不同水介质类型都随磁化时间的增加其电导率增大，但电导率增大到一定值后不再增加；石英、赤铁矿、磁铁矿和黄铁矿的矿物表面接触角在磁化水的作用下，接触角存在相应的增大趋势，因此磁化水可以部分改变矿物的表面性质。同时测试表明，因为水分子运动的瞬时性，导致了磁场对于运动形式的水介质其理化性质影响缺乏明显的规律性，又加之矿浆体系中水、矿物颗粒、分选区域三相的多因素影响交织共存，磁化对矿浆体系的表面张力、运动粘度、溶氧度、动电位影响的系统规律探索未明确。但由于磁化水对矿物表面接触角的影响及外加磁场对于静态水的电导率影响规律揭示，阐明了磁-浮复合力场设备提高微细粒矿物浮选回收的技术可行性，因此项目团队研制了实验室规格的磁浮复合力场实验设备试验研究表明，同比传统实验室逆流矿化CPT浮选柱，微细粒铁矿物回收率提高了10个百分点。