Solid-liquid magnetic separation using bulk superconducting magnets

Abstract

Our research is to magnetize the high-bulk superconductors and to supply magnetic field environment realized by superconducting bulk magnets to various applications. In this paper, we aim to apply the superconducting bulk magnets to the high gradient magnetic separation (HGMS). Using a face-to-face type superconducting bulk magnet system in which a pair of bulk superconductors are oppositely arranged, Y123 bulk superconductors are magnetized by the "IMRA" method (pulsed field magnetization), and consequently, a magnetic field of 1.6 T is achieved between the magnetic poles. Next, HGMS using superconducting bulk magnets is demonstrated. A separation pipe into which filter matrices composed by ferromagnetic wires are stuffed is set between the magnetic poles and the slurry mixed with fine powder of -hematite (Fe 2 O 3 ) particles is flown. As the results of HGMS, over 90% of the Fe 2 O 3 was separated. Moreover, separation filters have to be washed so that they are not clogged with captured particles. We confirmed that the filter was briefly washed by flowing water after moving the separation pipe from magnetic poles.

Highly efficient magnetic separation using five-aligned superconducting bulk magnet

“…1) The magnetic separation of magnetite with d=0.5 µm was the most effective and the separation efficiency decreases with increasing V f and with decreasing the number of the magnetic pole n. 2) The experimental results roughly follow the equation (2). The magnetic separation efficiency k per one magnetic pole can be estimated for each experimental condition using the relation.…”

“…In this subsection, we estimate the magnetic separation efficiency k per one magnetic pole for the typical experimental results using equation (2). Figures 5(a) and 5(b) show the normalized concentration C/C 0 as a function of the number of the magnetic pole, n, for the results of d=0.5 µm and d=0.1 µm, respectively.…”

“…The maximum trapped field B T FC of 17 T at 29 K has been achieved on the bulk by the field-cooled magnetization (FCM) using a superconducting magnet (SM) [1]. The investigations of the magnetic separation using the superconducting bulk magnet as high as a few Tesla have been reported [2][3][4]. Under the magnetic field B=µ 0 H, the magnetic force F M for the spherical particles of b in radius with susceptibility χ p in the solvent with susceptibility χ f can be represented in the following [4],…”

Horizontal deflection of single particle in a paramagnetic fluid

“…Many kinds of magnetic separation techniques, such as beneficiation of iron ore, recovery of metal from waste material, attraction of very small ferro-magnetic particles onto steel filter wires (high gradient magnetic separation, HGMS), biomagnetic extraction of heavy metals and so on, have been developed and applied in industry. However, these techniques are restricted to treating ferromagnetic substances as the separation criteria are based on the repulsion/attraction towards the magnetic field [2][3][4][5][6][7][8].…”

Evaluation of magnetic force distribution on a pair of superconducting bulk magnets

“…Since the bulk magnet can generate strong magnetic field exceeding 2 T that is the limit of ordinary iron-cored electromagnets by compact device in a low running cost, various industrial applications such as motor/generator [2], magnetron spattering [3], drug delivery system (DDS) [4] and magnetic separation [5,6] are considered. To propagate an industrial application of bulk magnet in the feature, it is necessary to enhance a magnetic force, as well as amplitude of magnetic field.…”