铁磁介质捕捉顺磁颗粒的动力学模型

 通过对磁场状态、流体速度分布等因素的综合考虑，提出了在磁分离技术中捕捉顺磁颗粒机理的动力学模型，得到了捕捉机理的物理解释；通过考察用高梯度磁选对精煤进行的脱硫降灰试验结果,发现由于介质被磁化, 磁化场与背景磁场相叠加, 磁场分布不具有轴对称性, 对顺磁颗粒的捕捉半径的概念很大程度上是不准确的. 根据J.E.Nesset 和J.A. Finch静态聚集模型,提出了捕捉范围的概念,其捕捉区和排斥区的分界线为一简单双曲线, 并因此得到捕捉横断面积的新计算公式.

THE DYNAMIC MODEL OF PARAMAGNETIC PARTICLES TO BE CAPTURED BY FERROMAGNETIC MATRIX

Based on the magnetic field state and fluid velocitydistribution, a dynamic model of paramagnetic particles to be captured byferromagnetic matrix is proposed. The phenomenologicalinterpretation of paramagnetic particle's trajectorydifferent from diamagnetic particle's is valuable on calculating the capture zone.From the observation on coal concentration and de-sulphurization by the High GradientMagnetic Separation (i.e. HGMS), the magnetic field is notaxisymmetrical so that the concept ofcapture radius is not very accurate. According to the Static EquilibriumBuildup Model (i.e. SEBM) proposed by J.E. Nesset and J.A. Finch, the notionof capture zone is proposed, the boundary curve separating thecapture zone and expel zone is found to be a single hyperbolic curve, and thus the newformula for calculating the area of capture zone is obtained.