【摘要】 通过浮选实验、zeta电位测试、接触角测量和X射线光电子能谱研究高浓度Zn²⁺对闪锌矿在酸性体系中可浮性的影响。结果表明,Zn²⁺吸附于闪锌矿表面,且当p H=4和Zn²⁺浓度为4×10^-2mol/L时,在闪锌矿表面形成Zn-羟基络合物。zeta电位增加且接触角从84.80°减小到36.48°,从而极大地抑制闪锌矿的可浮性。当单独以S2-或Cu²⁺作为活化剂时,无法活化吸附Zn²⁺后的闪锌矿,其接触角也无明显变化;而采用S^2-与Cu²⁺组合活化剂时,吸附Zn²⁺后的闪锌矿可被活化而浮选。这归因于S^2-可先将闪锌矿表面的Zn-羟基络合物消除,Cu²⁺即可吸附在闪锌矿表面上并形成Cu₂S·S⁰疏水膜。更多还原

【Abstract】 The influence of high concentration Zn²⁺ on the floatability of sphalerite in an acidic system was investigated via flotation experiments, zeta potential measurements, contact angle measurements, and X-ray photoelectron spectroscopy. The results indicated that Zn²⁺ was adsorbed on the sphalerite surface and a Zn-hydroxyl complex was formed at a p H of 4 and a Zn²⁺ concentration of 4×10-2 mol/L. The zeta potential increased and the contact angle decreased from 84.80° to 36.48°, strongly inhibiting the floatability of sphalerite. When S2-or Cu²⁺ activator was used alone, sphalerite was not activated after Zn²⁺ was adsorbed, and its contact angle did not change significantly. However, by using a combination of S^2- and Cu²⁺ activators, its floatability was realized after Zn²⁺ adsorption. This result was attributed to the removal of the Zn-hydroxyl complex on the surface of sphalerite by S^2-. After this removal, Cu²⁺ was adsorbed on the sphalerite surface to form a Cu₂ S·S⁰ hydrophobic film.更多还原