基于能量适配的分级浮选试验研究

Experimental study of classified flotation based on energy input and distribution

为了提高煤泥全粒级浮选回收率,提出了基于能量适配的分级浮选工艺,比较了均一能量输入模式混合浮选和能量适配的分级浮选的回收效果及能量消耗指数,并从浮选动力学角度对其强化回收机理进行了分析.结果表明：浮选＋0.125mm粗粒级的能量适当转移至-0.125mm细粒级浮选可有效提高全粒级回收率,与混合浮选相比,分级浮选回收率最高增加9.43%;在浮选中间阶段（20~100s）,分级浮选能量利用率明显高于混合浮选,其对浮选回收率的改善主要归功于促进中等可浮性物料的上浮;粗粒级低能量浮选可增加黏附概率并减少颗粒脱附,高能量输入浮选细颗粒时,高的叶轮搅拌速度产生强的剪切速率,浮选回收率增加.

To improve recovery of coal slime flotation of all sizes,the classified flotation method was proposed based on energy input and distribution.The fine coal recovery and flotation energy consumption index of mixing flotation using uniform energy input was compared with those of classified flotation with variable energy input.The intensification mechanism was also investigated from the perspective of flotation kinetics.The results show that flotation recoveries of different sizes were improved effectively by transferring some energy from ＋0.125 mm flotation to-0.125 mm appropriately.The recovery of classified flotation compared with that of mixed flotation increased by 9.43%.Flotation energy utilization rate in the middle period（20—100s）was significantly higher than that of mixing flotation.The improvement on flotation recovery of classified flotation could be mainly attributed to the floated-out of materials with medium floatability.Low energy input flotation of coarse coal particles can increase the probability of adhesion and prevent particles from becoming detached from the bubbles.Fine particles flotation with high energy input can produce high shear rate by agitation of impeller,resulting in increasing of flotation recovery.