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首页> 外文期刊>ISIJ international >Effect of Wettability on Penetration and Flotation Behavior of a Particle in Refining Process
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Effect of Wettability on Penetration and Flotation Behavior of a Particle in Refining Process

机译：润湿性对精炼过程中粒子渗透和浮选行为的影响

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Powder blasting is often performed in refining processes for improving their reaction efficiency. Herein, the effect of wettability on penetration and flotation behavior of a particle was examined via a water model experiment. A polypropylene particle was blasted onto the water surface with Ar gas through a single-hole nozzle, and the behavior of the particle during penetration into water to flotation on the water surface was recorded using a high-speed camera. Wettability between the particle and water was changed by applying a repellent or hydrophilic material on the particle. Based on the penetration of the particle, an air column was generated and a residual bubble remained on the particle after the air column ruptured. Repellent particles floated on the water surface in a short period of time because the maximum penetration depth was short and the diameter of the residual bubble was large. Conversely, hydrophilic particles stayed longer in water than repellent particles because the maximum penetration depth was relatively long and the residual bubble detached from the particle. The mechanism which wettability affects penetration and flotation behavior was analyzed, and it was elucidated that the controlling factor of particle behavior is the adhesion point of the air column on the particle. In the case of repellent particles, the adhesion point changes toward to penetrating direction of the particle and the force caused by the surface tension of water increases. Therefore, the maximum penetration depth decreases and the diameter of the residual bubble increases.
机译：通常在精炼过程中进行粉末爆炸，以改善其反应效率。这里，通过水模型实验检查润湿性对颗粒渗透和浮选行为的影响。通过单孔喷嘴将聚丙烯颗粒用Ar气体喷射到水表面上，并且使用高速相机记录在水面上渗透到水中浮选过程中的颗粒的行为。通过在颗粒上施加疏口剂或亲水性材料来改变颗粒和水之间的润湿性。基于颗粒的渗透，在空气塔破裂后产生空气塔，残留在颗粒上残留气泡。在短时间内漂浮在水面上的疏口颗粒，因为最大渗透深度短，残留泡的直径大。相反，亲水性颗粒在水中保持比疏扰颗粒更长，因为最大渗透深度相对较长，并且与颗粒脱离的残余气泡。润湿性影响渗透性和浮选行为的机制被分析，阐明了颗粒行为的控制因子是颗粒上的空气柱的粘附点。在驱虫颗粒的情况下，粘合点朝向颗粒的渗透方向变化，并且由水的表面张力引起的力增加。因此，最大渗透深度降低，残留气泡的直径增加。

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