Measurement of the adhesion force between particles for high gradient magnetic separation of pneumatic conveyed powder products

作者：Senkawa K^*; Nakai Y; Mishima F; Akiyama Y; Nishijima S

来源：Physica C-Superconductivity and Its Applications, 2011, 471(21-22): 1525-1529.

DOI：10.1016/j.physc.2011.05.230

• Magnetic separation
• Powder
• Superconducting magnet
• Adhesion force

In the industrial plants such as foods, medicines or industrial materials, there are big amount of issues on contamination by metallic wear debris originated from pipes of manufacturing lines. In this study, we developed a high gradient magnetic separation system (HGMS) under the dry process by using superconducting magnet to remove the ferromagnetic particles. One of the major problems of dry HGMS systems is, however, the blockage of magnetic filter caused by particle coagulation or deposition. In order to actualize the magnetic separation without blockage, we introduced pneumatic conveyance system as a new method to feed the powder. It is important to increase the drag force acting on the sufficiently dispersed particles, which require strong magnetic fields. To generate the strong magnetic fields. HGMS technique was examined which consists of a magnetic filter and a superconducting solenoid magnet.
As a result of the magnetic separation experiment, it was shown that the separation efficiency changes due to the difference of the cohesive property of the particles. On the basis of the result, the adhesion force which acts between the ferromagnetic particles and the medium particles used for the magnetic separation was measured by Atomic Force Microscope (AFM), and cohesion of particles was studied from the aspect of interparticle interaction. We assessed a suitable flow velocity for magnetic separation according to the cohesive property of each particle based on the result.

• 出版日期2011-11