The analysis of the force of particles in magnetic separation equipment is one of the important contents in the study of magnetic separation theory. Zhang Yingqiang et al. started from the magnetic fluid Ber-nonuli equation, stress tensor equation and Newton's law, and applied the wedge magnetic pole to establish vertical upwards. The magnetic buoyancy builds a kinetic model of non-magnetic ore particles in a hydrodynamic static sorting. Wei Honggang et al. analyzed the magnetic field strength H and the magnetic field gradient grad H function curve from the analysis of the gap magnetic field characteristics of the induction roller, and solved the exit angle and the roll speed ω and the ore by analyzing the force of the ore. Based on the relationship of the magnetic susceptibility χo, a mathematical model of the single-particle weak magnetic mineral trajectory is established. Ku Jianang et al. used the rough selection operation of the Φ1050mm×3000mm weak magnetic separator as the example in the Panzhihua dense concentrator. The traditional magnetic separation theory was used to predict the recovery rate of different granular magnetic particles. Peng et al fluidization gas-solid interaction model in order to establish during magnetic particles for high gradient magnetic separator apparatus to optimize the operating parameters, under certain conditions than the single-particle coal powder magnetic susceptibility, by high gradient magnetic The dynamics analysis of the single-particle spherical pulverized coal was carried out, and the dynamic mathematical model of the single-particle pulverized coal movement in the gas-solid fluidized sorting process was established.
With the improvement of computer performance and the development of simulation technology, the use of large-scale finite element analysis software for simulation calculation and visual analysis of specific magnetic fields provides a reference for structural optimization and design and manufacture of magnetic separators, and has become a magnetic separation research. The main content. Zhang Yishun et al. based on Magnet software to simulate the magnetic field lines and magnetic induction distribution of single-ring magnetic system, four-stage splicing magnetic system (with yoke iron) and eight-stage splicing magnetic system (with/without yoke). The relationship between the magnetic field of each magnetic field along the surface of the magnetic roller and the relationship between the magnetic induction intensity and the separation stroke function. The relationship between the ratio of the magnetic properties of the magnetic particles under the force balance condition and the magnetic induction of each magnetic system is investigated. Comprehensive analysis shows the sorting criteria for minerals under different magnetic system types. Zheng Xiayu et al. used ANSYS software to simulate the magnetic field characteristics around magnetic media under different magnetic media arrangement. In addition, the influence of the saturation magnetization of the magnetic medium of the high gradient magnetic separator on the magnetic properties of the magnetic medium is also studied. Cao Xiaochang et al. used computational fluid dynamics (CFD) numerical simulation method to analyze the flow field inside the high gradient magnetic separator, observed the flow field of the slurry inside different structures, and improved the structure of the tail box and the concentrate tube. The design provides a theoretical basis for the optimization of the internal structure of the vertical ring magnetic separator.
Magnetic media is a major component of high-gradient magnetic separators. The study of magnetic media with high magnetic field gradients is one of the main research contents in the field of magnetic separation. In order to explore the effect of a newly designed heterogeneous magnetic medium in the high-gradient magnetic separator sorting practice, Li Wenbo et al. carried out the equal-diameter and other wire-diameter round bar media and shaped media, and other gaps with different wire diameter round bar media. The comparison and sorting test of different wire diameter shaped media with equal clearance, and the particle size analysis of the wire-cut round bar medium and the shaped medium with different gaps, the results show that the high-gradient magnetic separator of the shaped medium is fine. The recovery of granular iron minerals is stronger and has the effect of reducing the lower limit of particle size recovery of the target mineral. Liu Lei et al. conducted a high-gradient magnetic separation test on the Anshan-type lean red iron ore. The effect of the diameter of the dielectric rod on the sorting index was studied under the combination of the dielectric rod gap and the diameter. The results showed that the diameter of the dielectric rod increased. The dielectric rod reduces the magnetic force of the fine particles, the mechanical inclusion of the non-magnetic particles is weakened, and the sorting index is improved. Ding Li et al. used the "unit medium" analysis method to carry out the high-gradient magnetic separation fine-grain hematite test of rod medium pulsation, and studied the influence of the number of dielectric filament layers of 2mm and 3mm rod media on the high gradient magnetic separation index. : With the increase of the number of layers of the medium, the high gradient magnetic separation index is significantly improved.
S. Mohanty et al. used CFD technology to simulate the sorting process of wet high gradient magnetic separator, and predicted the probability of magnetic particles capturing in magnetic medium. The prediction results were basically consistent with the laboratory test results. Iuzheng Cheng studied the influence of the magnetic field direction of the high gradient magnetic separator on the sorting performance, and compared the sorting performance of the horizontal magnetic system and the vertical magnetic system high gradient magnetic separator. The results show that the vertical magnetic system high gradient magnetic separator The magnetic leakage is small, and a stronger magnetic field strength can be generated under the same energy consumption, and therefore, the recovery efficiency of the magnetic particles can be improved. Jan F. Stener et al. studied the application of ultrasonic technology in wet weak magnetic separators. The results show that ultrasonic waves can effectively penetrate deep into the material layer, but it does not significantly affect the particle motion speed. Ascending, the depth of action of the ultrasonic waves in the material layer is reduced. SKBaik et al. used finite element analysis method to simulate the magnetic field of superconducting magnetic separator used in water treatment, and compared the magnetic force of magnetic particles when the magnetic medium was placed or not placed under high background field strength (greater than 6T). Differences, and 2-D and 3-D simulation calculations and studies on magnetic field distribution. Veerendra Singh et al. studied the sorting behavior and trajectory of magnetic particles in a dry magnetic roller sorter. The results show that the shape of the particles is in addition to the particle size, the specific magnetic susceptibility of the particles, the rotational speed of the magnetic roller and the field strength. The main factors that affect its capture.
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