Abstract
The purpose of this paper is to present a study of the mechanical entrapment of non-magnetic material in a magnetically captured product and the effects on entrapment produced by vibrating the matrix in high gradient magnetic separation. The study revealed that the magnetic capture on the upstream side of the wires used in HGMS would inevitably lead to mechanical entrapment. A number of ways used to improve the selectivity of HGMS were evaluated and the results show that the vibration HGMS has advantages over the other methods. A new method, the so called cryogenic cell method, has been developed in our laboratory, which, when used together with the microscopic system, can provide an insight in the capture of the magnetic material on a single wire. It was confirmed that the cryogenic cell method is an efficient diagnostic tool for the investigation on magnetic separation.
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