Abstract

The authors compare the effect exerted by copper ions and sulphide copper nanoparticles on flotation of Gorevka deposit sphalerite using potassium n-butyl xanthate and in reagent-less regime. Covelline-like colloid particles 4–8 nm in size, obtained in interaction of copper (II) and sulfide ions in aqueous solutions, are characterized using the methods of dynamic light scattering, electron microscopy and diffraction. Sphalerite surface after reaction with copper ions and CuS dispersoid solutions are described by zeta-potential measurements and X-ray photoelectron spectroscopy. It is found that sphalerite flotation after activation with nanoparticles is lower than with copper ion solutions of the same concentrations, and improves with increasing duration of activation and flotation processes. The mechanism of CuS nanoparticles consists in creation of active centers for the collector to attach to, which intensifies the hydrophobic behavior and adsorption of the collector. Moreover, CuS nanoparticles promote formation of a special microrelief of the solid–liquid interface, which ensures rupture of liquid film and attachment of sphalerite particles to air bubbles when they collide.

中文翻译：

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硫化铜纳米颗粒作为闪锌矿浮选活化剂的功能分析

摘要

作者比较了铜离子和硫化铜纳米颗粒对使用正丁基黄原酸钾和无试剂方案浮选 Gorevka 矿床闪锌矿的影响。大小为 4-8 nm 的 Covelline 状胶体颗粒是通过水溶液中的铜 (II) 和硫化物离子的相互作用获得的，使用动态光散射、电子显微镜和衍射的方法进行表征。通过 zeta 电位测量和 X 射线光电子能谱描述了与铜离子和 CuS 分散体溶液反应后的闪锌矿表面。发现用纳米颗粒活化后闪锌矿浮选低于相同浓度的铜离子溶液，并且随着活化和浮选过程持续时间的增加而提高。CuS 纳米粒子的机制在于为收集器创造活性中心以附着，这加强了收集器的疏水行为和吸附。此外，CuS 纳米颗粒促进了固液界面特殊微浮雕的形成，这确保了液膜破裂以及闪锌矿颗粒在碰撞时附着在气泡上。