难浮煤泥浮选速率试验研究

针对主导粒级为细粒级的难浮煤泥,进行了窄粒度级和全粒度级的浮选速度试验。结果表明：浮选速度由快到慢的粒级依次为0.125～0.074、0.250～0.125、〈0.074、0.500～0.250、〉0.500 mm。粗粒级煤粒因其质量大、脱附概率高、部分连生体表面疏水性较差,需在高能量输入条件下,通过较长时间的矿化作用...

Studies on flotation rate of a hard-to-float fine coal

Flotation rate experiments of narrow particle size and whole particle size were carried out for exploring the variation of hard to float coal flotation rate.The results show that flotation rate of grain size decreases in the following order:0.125～0.074,0.250～0.125,＜0.074,0.500～0.250 and ＞0.500 mm.Coarse particles with the characteristics of large quality,high desorption probability and less hydrophobic of part intergrowth surface can be floated by long time mineralization under the high energy input condition.Relatively,the fine particles are with the characteristics of large surface areas,high flotation agent consumption and large content of fine mud.Matlab software was also used to calculate the maximum recovery and flotation rate constant of narrow particle size and whole particle size of this slime.Calculated results comparing with experimental values show that flotation rate of narrow particle size slime meet the classical first kinetic model,and the rectangular model is the most appropriate model of whole particle size flotation rate.