Overview
FrançaisABSTRACT
Metallic ore fragmentation includes crushing and grinding operations. The objective is to release the constituent mineral species of polycrystalline material in order to perform separations aimed at obtaining a marketable concentrate, a metal or a metallic compound. Fragmentation is such a costly operation in terms of investment, energy and maintenance as to influence the choice and assembly of equipment and/or even put into question the relevance of its implementation.
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Read the articleAUTHORS
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Pierre BLAZY: Honorary Professor - Former Director, École Nationale Supérieure de Géologie (ENSG)
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El-Aïd JDID: Doctor of Science - Research Engineer at the Environment and Mineralurgy Laboratory (LEM) - INPL-CNRS UMR 7569
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Jacques YVON: Doctor of Science - Professor at ENSG, Institut National Polytechnique de Lorraine (INPL) - Director of the Environment and Mineralurgy Laboratory (LEM), - INPL-CNRS UMR 7569
INTRODUCTION
Fragmentation is such a costly operation in terms of investment, energy and maintenance, that these items can influence the choice and assembly of equipment and/or call into question the very relevance of the implementation.
In fragmentation, reducing energy consumption is not the only goal to aim for; other objectives are just as important:
granular distribution, largely influenced by the type but also by the cut-off accuracy of the separator (or classification system) associated with the fragmentation device; the separator also consumes energy and this consumption is inversely proportional to the square of the cut-off size; however, certain types of device lead to products with fairly narrow granular distributions;
the release mesh ; in the case of ores, the aim is to release at least one mineral species under conditions compatible with concentration operations; as selectivity may be imperfect, a pre-concentrate can be prepared, which will then be reground and subjected to another separation operation; this sequence has the advantage of only fine grinding a small quantity of material, which limits energy expenditure and the proportion of ultra-fine particles, which are always tricky to manage;
grain morphology, a function of fragmentation mode; this aspect generally conditions the rheology of powders and pulps;
surface reactivity: the tendency to amorphization associated with increased solubility is most often mentioned, as is a variation in the affinity of the unit area for certain adsorbents: increase or decrease, depending on the case.
For more information on the theoretical and technological aspects of fragmentation, please refer to the following files and .
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Fragmentation applied to metal ores
Economic data
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Operating costs
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