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.

喷粉通常在精炼过程中进行，以提高其反应效率。在本文中，润湿性对颗粒渗透和浮选行为的影响通过水模型实验进行了检验。聚丙烯颗粒通过单孔喷头用氩气喷射到水面上，并使用高速相机记录颗粒在渗透到水中到在水面上浮选过程中的行为。颗粒和水之间的润湿性通过在颗粒上施加排斥剂或亲水材料而改变。基于粒子的渗透，产生气柱，气柱破裂后残留气泡残留在粒子上。由于最大穿透深度较短，残留气泡直径较大，驱虫粒子在短时间内漂浮在水面上。相反，亲水性颗粒在水中的停留时间比排斥性颗粒长，因为最大渗透深度相对较长，残留气泡从颗粒上分离。分析了润湿性影响渗透和浮选行为的机理，阐明了粒子行为的控制因素是气柱在粒子上的附着点。对于驱虫粒子，附着点向粒子的渗透方向变化，水的表面张力引起的力增加。因此，最大穿透深度减小，残留气泡直径增大。