Separation of particles of different surface energies through control of humidity
Separation of particles of different surface energies through control of humidity
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DOI：
10.1016/j.mineng.2020.106680
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发表时间：
2021
影响因子：
4.8
通讯作者：
Bernardo Moreno Baqueiro Sansao;J. Kellar;W. Cross;A. Romkes
中科院分区：
文献类型：
--
作者：
Bernardo Moreno Baqueiro Sansao;J. Kellar;W. Cross;A. Romkes
矿物分类和浓缩以及随后金属提取的许多方法都是在水基环境（水溶液）中进行的。通过减少水消耗实现可持续加工将成为使采矿业务长期可行的关键因素。在潮湿的环境中，水的毛细冷凝可以发生在颗粒和基底之间。本文的目的是确定分离窗口，其中相对空气湿度（RH）的控制对于不同界面能值的亲水性和疏水性颗粒产生不同的基底粘附。将等离子体清洁的玻璃珠和三氯（十八烷基）硅烷（TCOD）处理的珠倾倒在等离子体清洁的玻璃盘上，并且冲击引起颗粒的分离。在一定范围的RH下进行的冲击试验表明，在45%和55%之间的湿度水平下，在80%的试验中可以实现等离子体清洁和TCOD处理的颗粒的分离。在50%和55%之间的湿度水平下，等离子体清洁的颗粒的回收率是TCOD处理的颗粒的五倍。
Many of the methods to classify and concentrate minerals and the subsequent extraction of metals takes place in water-based environments (aqueous solutions). Sustainable processing through the reduction of water consumption will become a key factor to make mining operations viable in the long term. In humid environments, capillary condensation of water can occur between the particle and substrate. The objective herein is to identify separation windows in which control of relative air humidity (RH) yields different substrate adhesion for hydrophilic and hydrophobic particles of different values of interfacial energy. Plasma cleaned glass beads, and trichloro(octadecyl)silane (TCOD) treated beads were poured on a plasma cleaned glass disk and an impact caused the detachment of particles. Impact tests performed under a range of RH showed that separation of plasma cleaned and TCOD treated particles can be achieved in 80% of the tests at humidity levels between 45% and 55%. The recovery of plasma cleaned particles was five times greater than TCOD treated particles at humidity levels between 50% and 55%.