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Particles at interfaces: The effects of shape and contact angle

机译：界面处的颗粒：形状和接触角的影响

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Froth flotation is the key separation and concentration step in the industrial processing of low grade ores. The fundamental interaction required for flotation is between particles and thin liquid films, both for attachment to the bubbles, and the stability of the froth. The particle shape after comminution depends on the specific mineral; for example, galena breaks into an orthorhombic shape, while talc forms flat, plate-like grains. When such particles attach to a bubble they distort the liquid- vapor interface in a way that depends on both their shape and hydrophobicity. Some particle orientations are more energetically stable than others and will be adopted preferentially. For orthorhombic particles there are four stable orientations, which are identified. Their stability is quantified using surface energy models. The combination of particle orientation and hydrophobicity also affects the stability of the thin liquid film between bubbles. By simulating the particles in the film, it is possible to identify which orientations most stabilize the liquid film. It is shown that a particle with a low hydrophobicity will adopt orientations that more stabilize the film than those with a high hydrophobicity. Dynamic models of particle stabilized liquid films are developed so that the interaction between several particles on the film can be investigated. The agglomeration of spherical particles on a film and the dynamic, self orientation of non-spherical particles will be demonstrated. While these simulations are extremely useful, experimental results are necessary to both validate the models and give further insight into the system under investigation. Experiments investigating liquid-vapor interfacial distortion are related back to the simulations. Dynamic results related to flotation systems capture particle and film behavior during bubble coalescence and bursting, and illustrate experimentally the effects of shape and hydrophobicity.
机译：泡沫浮选是低级矿石工业加工的关键分离和浓缩步骤。浮选所需的基本相互作用在颗粒和薄液体膜之间，两者都用于对气泡附着，以及泡沫的稳定性。粉碎后的颗粒形状取决于特定的矿物质;例如，Galena突破了矫形形状，而滑石形状平坦，板状晶粒。当这些颗粒附着到气泡时，它们以取决于它们的形状和疏水性的方式扭曲液体膜界面。一些粒子取向比其他粒子取向更稳定，并将优先采用。对于矫骨颗粒，存在四种稳定的取向，其被鉴定。使用表面能量模型量化它们的稳定性。颗粒取向和疏水性的组合也影响气泡之间薄液体膜的稳定性。通过模拟膜中的颗粒，可以识别最稳定液体膜的取向。结果表明，具有低疏水性的颗粒将采用比具有高疏水性的薄膜更稳定的取向。开发颗粒稳定液体膜的动态模型，从而可以研究膜上的几种颗粒之间的相互作用。将说明球形颗粒对膜上的球形颗粒的凝聚和动态的非球形颗粒的自我取向。虽然这些模拟非常有用，但在验证模型并进一步了解系统正在调查中，需要实验结果。研究液体蒸气界面变形的实验与模拟有关。与浮选系统相关的动态结果捕获泡沫聚结和突发期间的粒子和薄膜行为，并说明实验形状和疏水性的影响。

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