Influence of matrix type on WHIMS performance in the magnetic processing of iron ores
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Date
2020
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Quast, K.
Skinner, W.
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Journal article
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Minerals Engineering, 2020; 152(article no. 106346):1-14
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Although the commercial beneficiation of iron ores by magnetic separation uses well established technology and equipment, there are still some fundamental and applied questions that have not been addressed in current published documentation. The main aspects investigated in this paper included the magnitude of the applied magnetic field, the effects of various matrices and the effects of the particle sizes of the materials. The wide range of recoveries of hematite particles to the magnetic fraction was attributed to their mineralogical characteristics and particle sizes. The use of various expanded metal matrices had significant effects on the recoveries of the hematite to the magnetic fraction, which is one of the innovative aspects of this study. The use of a fine expanded metal matrix with its many sharp edges and corners enhanced the localised magnetic field intensity, giving much higher recoveries of hematite to the magnetic products. The use of the fine expanded metal matrix to the processing of a very low-grade commercial tailing sample suggested an enhancement factor of approximately ten compared to a commercially available magnetic separator that uses a grooved laminated rotor. The quantitative analysis of the effects of the matrix for enhanced recovery of fine hematite particles determined experimentally should lead to improved performance of commercial high intensity magnetic separators.
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Copyright 2020 Elsevier
Access Condition Notes: Accepted manuscript available on open access