X-ray radiography presents a non-invasive and dynamic approach for examining multiphase flows, particularly in complex systems like flotation froths. While this technique has been applied successfully in various multiphase studies, such as granular flows and fluidised beds, its utilisation in understanding flotation froths is novel. This study aimed to investigate the behaviour of particles and bubbles within the froth phase using a unique flotation rig combined with an X-ray radiographic setup. Specifically, it sought to understand how the pulp-froth interface influences the entry of bubble clusters into the froth phase and to observe the journey of particles within the froth. The results provided tangible evidence supporting previously inferred phenomena. It was found that the interface between the pulp and froth acted as a barrier, impeding the entry of bubble clusters into the froth phase. However, what was particularly noteworthy about the study was its revelation of extraordinary dynamics in particle movement within the froth phase. These dynamics included the occurrence of reattachment and dropback at critical solid fractions, phenomena that were visually observed for the first time.

中文翻译：

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深入了解泡沫相动力学：颗粒行为的 X 射线观察


X 射线照相术为检查多相流提供了一种非侵入性的动态方法，特别是在浮选泡沫等复杂系统中。虽然该技术已成功应用于各种多相研究，例如颗粒流和流化床，但它在理解浮选泡沫方面的用途是新颖的。本研究旨在使用独特的浮选装置结合 X 射线照相装置来研究泡沫相中颗粒和气泡的行为。具体来说，它试图了解纸浆-泡沫界面如何影响气泡团簇进入泡沫相，并观察颗粒在泡沫中的移动。结果提供了有形的证据来支持先前推断的现象。研究发现，纸浆和泡沫之间的界面起到了屏障的作用，阻碍了气泡簇进入泡沫相。然而，这项研究特别值得注意的是，它揭示了泡沫相中粒子运动的非凡动力学。这些动力学包括在临界固体组分处发生重新附着和下降，这些现象是第一次目视观察到的现象。