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    The different stages of the mechanism of concentration in spiral concentrators are fine-size coal from Alabama surface mine washer using Humphreys spiral.

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    11 Dec 2019 More recently, spiral concentrators have been widely used to recover fine coal as well as gold, iron ore and other minerals. The importance of 

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    Leading mining houses, including Glencore Xstrata, Anglo Coal, BHP Billiton, OceanaGold, QM and Rio Tinto, use Multotec mineral processing equipment.

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