Evolution of the mineral liberation characteristics of an iron ore undergoing grinding |
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| Authors: | MA Bérubé JC Marchand |
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| Institution: | 1. Department of Geology, Laval University, Quebec, Que. G1K 7P4 Canada;2. Department of Mining and Metallurgy, Laval University, Quebec, Que. G1K 7P4 Canada |
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| Abstract: | The main objective of this experimental study was to investigate the evolution of the mineral liberation characteristics of an ore undergoing grinding. Six samples of an iron ore containing hematite, magnetite and quartz have been tested. Mineral grade and liberation measurements have been performed with an image analyser on polished sections of particles from several discrete size intervals.For each product, the grade in iron oxides was increasing greatly with the fineness of the particles. Moreover, in each size interval down to 270 mesh, it was slightly decreasing as grinding proceeded. These behaviors are due to the fact that iron oxides were ground more easily than the siliceous gangue. The degree of liberation of the valuable minerals was evidently increasing with the particle fineness. Moreover, for each size interval coarser than 48 mesh, it has also shown a slight decrease with grinding. For finer sizes however, it appeared in practice invariant and independent of the grade or of the degree of grinding. These observations are of interest when considering that the grinding products tested were very different in fineness while corresponding to various modes of fragmentation.(jaw crushing, roll crushing and ball milling) and to an ore with a high tendency to break along the mineral grain boundaries. |
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