For magnetized fluidized beds with Geldart-B magnetizable and nonmagnetizable particles operated under the magnetization-LAST mode, segregation occurs and deepens as the magnetic field intensity increases. This work aimed to explore the effects of particle size and density difference on such segregation. The field intensities (H_is and H_cs) for the segregation to initiate and complete increased as the gas velocity (U_g) increased. Moreover, their increases were steeper at higher gas velocities. The increase of U_g raised not only the collision to the magnetic chains but also their mixing tendency with the nonmagnetizable particles. For the given nonmagnetizable particles and U_g, H_is and H_cs increased as the size or density of the magnetizable particles decreased, indicating that it was more difficult for the segregation to occur and complete. Additionally, the smaller/lighter the magnetizable particles, the steeper the variations of H_is and H_cs with U_g. A much stronger magnetic field was required for more of such magnetizable particles to form the desired magnetic chains and keep the desired size. Segregation could only be postponed but completely prevented under the magnetization-LAST operation mode however the two types of particles were matched.

对于具有在磁化-LAST模式下运行的Geldart-B可磁化和不可磁化颗粒的磁化流化床，随着磁场强度的增加，会发生偏析并加深。这项工作旨在探讨粒度和密度差异对这种偏析的影响。随着气体速度（U _g）的增加，分离开始和完成的场强（H _is和H _cs）增大。此外，在较高的气体速度下，它们的增加更为陡峭。U _g的增加不仅增加了与磁链的碰撞，而且增加了它们与不可磁化颗粒的混合趋势。对于给定的不可磁化粒子，U _g，H _is和H _cs随着可磁化颗粒的尺寸或密度减小而增加，这表明偏析难以发生和完成。另外，可磁化颗粒越小/越轻，H _is和H _cs随U _g的变化就越大。为了使更多的这种可磁化颗粒形成所需的磁链并保持所需的尺寸，需要更强的磁场。在磁化-LAST操作模式下，只能延迟分离，但可以完全阻止分离，但是两种类型的粒子是匹配的。