基于浮选速率试验的可浮性研究

Floatability Research on Flotation Rate Test

为了探究煤泥浮选过程中可浮性的变化规律,进行了窄粒级的浮选速率试验。试验结果证明:0.5~0.25 mm粒级的浮选速度最快,0.25~0.075 mm粒级次之,-0.075 mm粒级最慢。随着浮选的进行,3个窄粒级的累积灰分不断增加,但细粒级由于细泥的污染,灰分增加幅度较大。通过理论推导得出,剩余物料可浮性准与可燃体回收率ε的关系为:准=ε∞(1-ε)。证明:随着浮选的进行,剩余物料的可浮性逐渐变差,单位时间浮出的有用矿物逐渐减少。将剩余物料可浮性进行量化后表明:随着浮选的进行,剩余物料可浮性的下降幅度随粒级减小而逐级变小。

In order to research the change of floatability in process of coal slime flotation, the flotation rate tests on narrow size fraction were performed. It is concluded that the flotation rate of 0.5~0.25 mm size fraction is the fastest, 0.25~0.075 mm followed,-0.075 mm slowest. As the flotation goes on, the accumulated ash of three narrow size fractions gradually increases, but due to the slime pollution, the ash of fine fraction increases much bigger. Namely the relation between the floatability of residual materials and recovery rate of combustible component is derived. It proves that: as the flotation goes on,the floatability of residual materials gradually becomes bad, and the valuable minerals emerging per unit time become less. Quantize the floatability, the results showing that: the floatability of 0.5 ~0.25 mm,0.25~0.075 mm,-0.075 mm sizes of residual materials decreases slowly level by level.