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本文评述了最近开发的浮选设备的基本原理;提出了一种新的由空穴化/气体核化而捕集颗粒的机理.理论分析和实际应用均已证明,空穴化和气体核化加快了颗粒附集于气泡的过程和浮选速度,并提供了一种改进浮选槽设计的方法。本文着重讨论了一种两段附着模型,并用此种模型来解释最近开发的某些浮选设备为什么提高了浮选速度.在第一阶段,生成气核/空穴,并附着于颗粒表面,这个阶段可采用搅拌,提高矿浆中溶解气体的含量以及液动空穴化来强化;在第二阶段,用传统浮选型气泡来捕集被气核活化的颗粒,这个阶段可采用静流条件和提高气体滞留量来强化。
This paper reviews the basic principles of recently developed flotation equipment and proposes a new mechanism for capturing particles by cavitation / gas nucleation. Both theoretical analysis and practical application have proved that cavitation and gas nucleation accelerate the process of particle entrapment in bubbles and the flotation velocity and provide a method to improve the design of flotation cell. This article focuses on a two-stage attachment model and uses this model to explain why some recently developed flotation equipment increases flotation speed. In the first stage, gas nuclei / holes are generated and attached to the surface of the particles. This stage can be agitated to increase the dissolved gas content in the slurry as well as liquid cavitation to strengthen. In the second stage, Bubbles to trap particles activated by gas nuclei, this stage can be used to enhance the static flow conditions and gas retention to strengthen.