Recent experimental advances for understanding bubble-particle attachment in flotation
Recent experimental advances for understanding bubble-particle attachment in flotation
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了解浮选中气泡-颗粒附着的最新实验进展
DOI：
10.1016/j.cis.2017.05.019
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发表时间：
2017-08-01
影响因子：
15.6
通讯作者：
Butt, Hans-Juergen
中科院分区：
文献类型：
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作者：
Xing, Yaowen;Gui, Xiahui;Butt, Hans-Juergen
气泡-颗粒相互作用在浮选中具有重要的理论和实际意义。在过去的几年里已经取得了重大进展，气泡-颗粒碰撞的过程是合理的理解。然而，由于理论分析和实验验证的困难，气泡-颗粒附着导致三相接触线形成的情况并非如此。对于附着，表面力起主要作用。它们控制气泡和颗粒之间的液膜的变薄和破裂。力、气泡变形和膜排水之间的耦合对于理解气泡-颗粒附着的基本机制至关重要。本文首先讨论了表征气泡-颗粒附着的宏观实验方法的进展，如感应计时器和高速可视化。然后，我们专注于在纳米尺度上测量气泡和固体表面之间的薄液膜的力和排水的进展。进展，限制，挑战和未来的研究机会进行了讨论。通过结合原子力显微镜和反射干涉衬度显微镜，力，气泡变形，和液膜排水可以同时测量。同时测量相互作用力和受限液膜的时空演化，为浮选提供了新的思路。
Bubble-particle interaction is of great theoretical and practical importance in flotation. Significant progress has been achieved over the past years and the process of bubble-particle collision is reasonably well understood. This, however, is not the case for bubble-particle attachment leading to three-phase contact line formation due to the difficulty in both theoretical analysis and experimental verification. For attachment, surface forces play a major role. They control the thinning and rupture of the liquid film between the bubble and the particle. The coupling between force, bubble deformation and film drainage is critical to understand the underlying mechanism responsible for bubble-particle attachment. In this review we first discuss the advances in macroscopic experimental methods for characterizing bubble-particle attachment such as induction timer and high speed visualization. Then we focus on advances in measuring the force and drainage of thin liquid films between an air bubble and a solid surface at a nanometer scale. Advances, limits, challenges, and future research opportunities are discussed. By combining atomic force microscopy and reflection interference contrast microscopy, the force, bubble deformation, and liquid film drainage can be measured simultaneously. The simultaneous measurement of the interaction force and the spatiotemporal evolution of the confined liquid film hold great promise to shed new light on flotation.