Mechanical Model And Simulation Of Centrifugal Separation Of Non-Magnetic Particles In Magnetic Fluid

The magnetic fluid centrifugal separation technology is an effective method to intensify the dressing effect of fine non-magnetic particles, using the magnetic fluid as the separation medium, based on the magneto hydrostatic separation in combination with the centrifugal force. This separation is potential for separating teeny and high-density minerals, meanwhile most domestic research is still at the initial stage and the sorting mechanism have not yet been analyzed systematically. So the study of the mechanism of compounding force field is great theoretical significant in guiding the subsequent research on the magnetic fluid centrifugal separation technology.This thesis starts from the magneto hydrostatic separation mechanism and centrifugal separation theory to analysis the feasibility of the new method. Based on analysis of the particle movement in the separation, viewing the magnetic fluid as continuous medium and the non-magnetic particle as dispersing systems, the dynamical model of sorting the non-magnetic particles in the centrifugal separation in magnetic fluid is established with the consideration of the magnetic buoyancy, centrifugal force and fluid drag force by the particles, which analyses the effect of the related parameters such as the particle size, fluid rotation speed and external magnetic field on separation. And this model is the theoretical basis for further calculations and experiments. Then, with the help of the FLUENT software, the numerical simulation of the liquid-solid two-phase flow in the the magnetic fluid hydrocyclone is set up regarding the particle diameter, centrifugal strength and other factors on the efficiency of separating. Finally, Based on the preparation principle of magnetic fluid, the water-based magnetic fluid used in the ore separation experiments has been prepared successfully by using two-layer surfactants to coat the magnetic Fe3O4nanoparticles. This magnetic fluid whose apparent density varies widely under the control of the external magnetic field has good magnetic properties. The paper also designs a simple magnetic field generator to test the mineral separation of cassiterite-quartz, chalcopyrite-quartz and cassiterite-chalcopyrite mixture. This test can lay a foundation for the preliminary research of the new method in the mineral separation field.