摘要
Particle-bubble interaction during electro-flotation of cassiterite was investigated by determining the recovery of cassiterite and the collision mechanism of cassiterite particle and H2 bubble. Flotation tests at different conditions were conducted in a single bubble flotation cell. The recovery of cassiterite was found to be affected by cassiterite particle and bubble size. A matching range, in which the best recovery can be obtained, was found between particle and bubble size. Collision, attachment, and detachment of the particle-bubble were observed and captured by a high-speed camera. Particle-bubble collision and attachment were analyzed with the use of particle-bubble interaction theory to obtain the experimental results. An attachment model was introduced and verified through the photos captured by the high-speed camera. A bridge role was observed between the bubbles and particles. Particle-bubble interaction was found to be affected by bubble size and particle size, which significantly influenced not only the collision and attachment behavior of the particles and bubbles but also the flotation recovery of fine cassiterite particles.
运用回收率和细粒锡石-气泡间的碰撞机制研究颗粒-气泡间的相互作用。用单泡浮选管进行浮选实验,考查不同条件下细粒锡石的浮选行为。结果表明,浮选回收率受颗粒和气泡尺寸的影响很大,在浮选回收率最高时,颗粒和气泡间存在一个最佳的匹配范围。运用高速摄影仪观察并捕捉颗粒-气泡间的碰撞、粘附、脱附过程,在已有理论的基础上,分析颗粒-气泡间的碰撞-粘附现象并解释浮选实验结果,通过捕捉图片证明颗粒-气泡间的粘附模型,发现颗粒-气泡间的桥连作用。锡石、气泡尺寸的大小影响锡石-气泡间的相互作用,这不仅影响锡石-气泡间的碰撞粘附行为,并最终影响细粒锡石的浮选回收率。
基金
Project(50774094)supported by the National Natural Science Foundation of China
Project(2011BAB05B01)supported by the National Key Technology Research and Development Program of China
Project(2013M542076)supported by the Postdoctoral Science Foundation of China
