新型闪速浮选机回收分级沉砂中石墨矿的试验研究

Recovering Graphite from Classifier Underflow by New Flash Flotation Cell

将闪速浮选工艺应用于晶质石墨浮选中,研究了闪速浮选机叶轮转速、表观充气速率和泡沫层厚度对石墨矿分选指标的影响。结果表明,在叶轮转速750 r/min、表观充气速率0.3 m^(3)/(m^(2)·min)、泡沫层厚度20 mm条件下,石墨矿分选指标较好。精矿粒级分析和显微观测结果表明,闪速浮选对0.074~0.180 mm粒级石墨回收效果较好,该粒级主要是晶质石墨单体以及富连生体。闪速浮选工艺能提前回收分级沉砂中的有用矿物,降低了过磨概率,实现对鳞片的保护,该工艺有望在晶质石墨矿浮选中实现工业应用。

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 m^(3)/(m^(2)·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.