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首页> 美国卫生研究院文献>Nanomaterials >Towards Understanding the Role of Surface Gas Nanostructures: Effect of Temperature Difference Pretreatment on Wetting and Flotation of Sulfide Minerals and Pb-Zn Ore
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Towards Understanding the Role of Surface Gas Nanostructures: Effect of Temperature Difference Pretreatment on Wetting and Flotation of Sulfide Minerals and Pb-Zn Ore

机译：了解表面气体纳米结构的作用：温差预处理对硫化物矿物质润湿和浮选的影响和PB-Zn Ore

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Surface nanobubbles at hydrophobic interfaces now attract much attention in various fields but their role in wetting-related phenomena is still unclear. Herein, we report the effect of a preliminary contact of “hot” solids with cold water previously proposed for generation of surface nanobubbles, on wettability of compact materials and flotation of particulate galena (PbS), sphalerite (ZnS), and Pb-Zn sulfide ore. Atomic force microscopy was applied to visualize the nanobubbles at galena crystals heated in air and contacted with cold water; X-ray photoelectron spectroscopy was used to characterize the surface composition of minerals. Contact angles measured with the sessile drop of cold water were found to increase when enhancing the support temperature from 0 to 80 °C for sphalerite and silica, and to pass a maximum at 40–60 °C for galena and pyrite (FeS ) probably due to oxidation of sulfides. The temperature pretreatment depressed the recovery of sulfides in collectorless schemes and improved the potassium butyl xanthate-assisted flotation both for single minerals and Gorevskoye Pb-Zn ore. The results suggest that the surface nanobubbles prepared using the temperature difference promote flotation if minerals are rather hydrophobic and insignificantly oxidized, so the addition of collector and activator (for sphalerite) is necessary.
机译：疏水性接口处的表面纳米胶布现在在各个领域吸引了很多关注，但它们在润湿相关现象中的作用仍然不清楚。在此，我们报告了先前提出的冷水初步接触的效果，以前提出了用于产生表面纳米杆状物的冷水，紧凑型材料和颗粒式图纳（PBS），闪脂（ZnS）和PB-Zn硫化物的浮选矿石。应用原子力显微镜，以在空气中加热的Galena晶体处可视化纳米泡并与冷水接触; X射线光电子能谱用于表征矿物的表面组成。发现用柄柄液滴测量的接触角在增强0至80℃的SpHalerite和二氧化硅中，并在40-60°C下通过可能到期的Galena和Pytite（FES）。氧化硫化物。温度预处理在聚集体方案中抑制了硫化物的回收，并改善了单一矿物质和GoreVskoye PB-Zn矿石的钾丁酯辅助浮选。结果表明，如果矿物相当疏水和微不一性氧化，则使用温差促进浮选的表面纳米胶布，因此需要添加收集器和活化剂（用于闪锌矿）。

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