颗粒气泡的匹配关系对细粒锡石浮选的影响

Effect of matching relationship between particles and bubbles on the flotation of fine cassiterite

针对细粒锡石难以分选的问题,采用改进的Hallimond管对不同粒级细粒锡石的浮选行为进行研究,并采用电解H2浮选和高速摄影仪研究颗粒与气泡间的匹配关系.在确定捕收剂用量和pH值的条件下,对颗粒粒度、电解条件(如阴极孔径、电流强度等)对锡石浮选回收率的影响进行了探索,考察了气泡大小变化及分布规律,探索了颗粒与气泡间相互作用.结果表明,颗粒粒度、阴极孔径、电流强度均对浮选回收率有很大影响;颗粒与气泡间有一个最佳匹配范围,在这个范围内,颗粒气泡捕集概率最大,浮选回收率较高.当pH约为4.5,MOS用量为100mg/L时,锡石矿物浮选效果较好.

Because of the difficulty to beneficiate fine cassiterite, the flotation behaviors of cas- siterite with different size fractions were investigated using a modified Hallimond tube, and the best matching relationship between particles and bubbles was studied by H2electrolysis flota- tion tests and high speed charge coupled device camera （high speed CCD camera）. Under a fixed collector concentration and pH value, the effects of particle size fraction, electrolytic con- ditions, including cathode aperture and current intensity, on the cassiterite recovery were ex- plored. The size change and distribution of bubbles were observed. Meanwhile, the interaction between particles and bubbles was also studied. The results show that in the presence of 100 mg/L MOS and pH of about 4.5, the flotation efficiency of cassiterite is considerably better. The cathode aperture, current intensity and particle sizes exert significant influence on the re- covery of cassiterite. There is an optimum matching range between particle size and bubble size within which the peak point of acquisition probability and recovery of the cassiterite occurred.