Coupling effect between magnetic wires and its influence on high gradient magnetic separation performance

Yaxiong Jiang, Jianwu Zeng, Mengbing Cao, Weijun Yu, Enlong Xie, Luzheng Chen
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Abstract

High gradient magnetic separation (HGMS) is effective for the separation of weakly magnetic minerals, and this method is achieved through the use of matrix, which is made of huge numbers of rod wires. So that the coupling effect of magnetic field and flow field between wires has a marked effect on the HGMS performance. In the investigation, the coupling effect between magnetic wires and its influence on high gradient magnetic separation performance were theoretically described and simulated using COMSOL Multiphysics. It is found that the magnetic field round a wire would be affected by the neighboring wires, and then a coupling effect of magnetic field between wires was produced, increasing the magnetic induction intensity on the upstream and downstream of wire surface. And the coupling effect of flow field could increase the slurry velocity at the regions of the wire surface with azimuth angles of 0° and 90°, which is beneficial for the selective capture of wire. These simulated results were basically validated with the experimental separation, using an innovative Magnetic Capture Analysis Method. It is found that the wire spacing has significant effect on the coupling effect of magnetic wires, and a critical spacing for wires could achieve an excellent coupling effect, which is beneficial for the improvement of HGMS performance. This investigation contributes to improve HGMS performance in concentrating fine weakly magnetic ores.
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磁力线之间的耦合效应及其对高梯度磁分离性能的影响
高梯度磁选(HGMS)对弱磁性矿物的分离非常有效,这种方法是通过使用由大量棒线组成的基体来实现的。因此,磁场和导线间流场的耦合效应对 HGMS 的性能有显著影响。在研究中,使用 COMSOL Multiphysics 对磁力线之间的耦合效应及其对高梯度磁分离性能的影响进行了理论描述和模拟。研究发现,磁力线周围的磁场会受到相邻磁力线的影响,进而产生磁力线之间的磁场耦合效应,增加磁力线表面上下游的磁感应强度。流场的耦合效应可以提高金属丝表面方位角为 0° 和 90° 区域的浆料速度,有利于金属丝的选择性捕获。利用创新的磁捕获分析方法,这些模拟结果与实验分离结果进行了基本验证。研究发现,磁导线间距对磁导线耦合效果有显著影响,临界磁导线间距可实现极佳的耦合效果,有利于提高 HGMS 性能。这项研究有助于提高 HGMS 在精选细粒弱磁性矿石时的性能。
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