Ore sorting is a modem preconcentrating stage ahead of the other conventional dressing methods. In former times, sorting was done by hand. Today, mechanical sorting is possible.
Successful application of an ore sorter depends on two important t criteria:
The valuable fraction must be liberated from gangue at a size range which can be handled by the machine.
The valuable fraction must be identifiable within the time available for examination by the machine.
Photometric ore sorting can be applied to wolframite. It can also be used for scheelite, if contained in white quartzite veins. Fluorescence ore sorting is a suitable method for scheelite.
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