Abstract The detrimental effect of seawater on Cu-Mo flotation has attracted much attention in recent years, which has mainly been focused on altering the detrimental effect of seawater on the floatability of molybdenum ore. The interaction between bubbles and particles during flotation is a key factor in understanding the detrimental effect of seawater. Therefore, this study aimed to investigate the effect of seawater on bubble-particle interactions with chalcopyrite and molybdenite surfaces. Moreover, the effect of emulsified kerosene, a typical molybdenite collector, on bubble-particle interactions in seawater was investigated. Artificial seawater was used as a seawater model solution in this study. Flotation tests using pure chalcopyrite and molybdenite showed that the addition of emulsified kerosene to artificial seawater at a specific pH could selectively improve the floatability of molybdenite while maintaining the low floatability of chalcopyrite. A study of the bubble-particle interactions was then performed to analyze the phenomenon. It was found that the kerosene adsorbed at the air/liquid interface of the bubble improved the bubble aspect ratio and reduced the bubble rise velocity in artificial seawater. Moreover, kerosene could accelerate the formation of three-phase contact between the bubble and both mineral surfaces at the natural pH of artificial seawater. Additionally, this study showed that seawater colloidal precipitate formed under high pH conditions might be adsorbed on the mineral surfaces and might improve the stability of the intervening liquid film on the surface, thus preventing bubble-particle attachment and decreasing mineral recovery. Under these high pH conditions, the emulsified kerosene and seawater precipitate might compete in terms of adsorption on the mineral surfaces and the flotation results would most likely depend on the kerosene and hydrophilic adsorbate coverage on the mineral surfaces.

中文翻译：

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气泡与海水中黄铜矿和辉钼矿表面的相互作用

摘要 海水对铜钼浮选的不利影响近年来备受关注，主要集中在改变海水对钼矿可浮性的不利影响。浮选过程中气泡和颗粒之间的相互作用是了解海水有害影响的关键因素。因此，本研究旨在研究海水对气泡-颗粒与黄铜矿和辉钼矿表面相互作用的影响。此外，研究了乳化煤油（一种典型的辉钼矿捕收剂）对海水中气泡-颗粒相互作用的影响。在本研究中，人工海水被用作海水模型解决方案。使用纯黄铜矿和辉钼矿的浮选试验表明，在特定 pH 值的人工海水中加入乳化煤油可以选择性地提高辉钼矿的可浮性，同时保持黄铜矿的低浮性。然后进行气泡-粒子相互作用的研究以分析该现象。研究发现，吸附在气泡气液界面的煤油提高了气泡的纵横比，降低了人工海水中气泡的上升速度。此外，煤油可以在人工海水的自然 pH 值下加速气泡与两个矿物表面之间三相接触的形成。此外，该研究表明，在高 pH 条件下形成的海水胶体沉淀物可能会吸附在矿物表面，并可能提高表面中间液膜的稳定性，从而防止气泡颗粒附着并降低矿物回收率。在这些高 pH 条件下，乳化煤油和海水沉淀物可能会在矿物表面上的吸附方面竞争，浮选结果很可能取决于矿物表面上的煤油和亲水性吸附物覆盖率。