浮选泡沫细粒脉石夹带与充气量的关系

Relationship between Froth Entrainment Entrained by Fine Gangues and Aeration Rate

为更好地揭示并合理利用浮选过程中细粒脉石的泡沫夹带与充气量的内在联系,采用自制的泡沫特性测试系统,模拟了浮选中充气量对泡沫的特性及脉石的泡沫夹带行为的影响规律。结果表明：在两相体系中,充气量的增大会明显降低泡沫层中气泡的兼并速度,增大泡沫的含液率及泡沫柱表观液流速度,显著提高泡沫水回收速率;在三相体系中,充气量的增大会显著降低泡沫中脉石的回流速度,显著提高顶部泡沫层的脉石质量分数。因此,在浮选过程中,在保证精矿有效回收的前提下,控制充气量是有效控制精矿泡沫夹带脉石的有效手段。

In order to reveal and reasonably utilize the internal relationship between aeration rate and froth entrainment of gangue fines in flotation,a self-made froth overflow rig was adopted to simulate the influencing rule of aeration rate to the properties of froth and entrainment of gangue. Results indicated that： in the two-phase foam,the increase of aeration rate effectively lower the coalescence rate and sauter diameter of bubbles,greatly reduce the foam drainage,and increase the foam fluid rate and apparent fluid rate. Thus,the rate of water recovery can be increased remarkably. In three-phase froth,recovery of gaugues in froth layer is significantly increased when the aeration rate was increased. Thus,controlling the aeration rate is beneficial for reducing the froth entrainment of gangue finess in flotation process under the premise of reasonable concentrate recovery.