Abstract
Recently, high gradient magnetic separation has been received much attention as one of the most effective method for separating weakly magnetic minerals. In the past many researches on the behaviour of single magnetic particle in a magnetic field had been conducted in order to study the separation mechanism.The separability in case of coexistence of nonmagnetic particle has not been investigated yet. In this study the attractability and separability of mixed samples of hematite and quartz in high gradient magnetic separation were studied experimentally by using experimental apparatus.With respect to the attractability, the critical capture time was expressed as the time at which 90% of saturated capture amount was attracted to the fine magnetic wire. The relation between this definition and the operational parameters have been introduced.From the separability stand point of view, the authors expressed it according to the relation between the feed grade and the ratio of enrichment. The separability cuves have been investigated and it was found that the separability curves were, more or less, constant for all tested powders as well as for all operational parameters. These results were found to be coincidence with that of conventional magnetic separators which treat ferromagnetic minerals in low magnetic field.From obtained results, the authors have concluded that the separability of high gradient magnetic separators is exactly same as that of conventional separators, and the results were confirmed by using SALA practical high gradient magnetic separator.
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