Recovering Graphite from Classifier Underflow by New Flash Flotation Cell
Flash flotation technique was introduced to an experiment to recover crystalline graphite.The influence of impeller speed,superficial aeration rate and foam layer thickness on the flash flotation indices of graphite was investigated.The results show that flotation with impeller speed of 750 r/min,superficial aeration rate of 0.3 m3/(m2·min)and foam layer thickness of 20 mm can bring a better flotation performance of graphite.According to the particle size analysis and microscopic observation analysis of concentrate,the flash flotation displays good recovery of the graphite in a particle size range of 0.074-0.180 mm,which is dominated by flake graphite monomer and rich intergrowth.As the flash flotation technique favors the collection of useful minerals from the classification underflow in advance,the probability of overgrinding can be reduced and the flake morphology can be therewith reserved.Therefore,flash flotation technique is expected to be commercially applied in the flotation recovery of crystalline graphite.
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