摘要
The influence of high concentration Zn^(2+) 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 Zn^(2+) was adsorbed on the sphalerite surface and a Zn-hydroxyl complex was formed at a pH of 4 and a Zn^(2+) 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 S^(2−) or Cu^(2+) activator was used alone,sphalerite was not activated after Zn^(2+) was adsorbed,and its contact angle did not change significantly.However,by using a combination of S^(2−) and Cu^(2+) activators,its floatability was realized after Zn^(2+) adsorption.This result was attributed to the removal of the Zn-hydroxyl complex on the surface of sphalerite by S^(2-).After this removal,Cu^(2+) was adsorbed on the sphalerite surface to form a Cu_(2)S·S^(0) hydrophobic film.
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Zn^(2+)对闪锌矿在酸性体系中可浮性的影响。结果表明,Zn^(2+)吸附于闪锌矿表面,且当pH=4和Zn^(2+)浓度为4×10^(−2) mol/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S^(2−)或Cu^(2+)作为活化剂时,无法活化吸附Zn^(2+)后的闪锌矿,其接触角也无明显变化;而采用S^(2−)与Cu^(2+)组合活化剂时,吸附Zn^(2+)后的闪锌矿可被活化而浮选。这归因于S2−可先将闪锌矿表面的Zn-羟基络合物消除,Cu^(2+)即可吸附在闪锌矿表面上并形成Cu2S∙S0疏水膜。
基金
the financial supports from the National Key R&D Program of China(Nos.2018YFC0903404,2018YFC1903400)
the National Natural Science Foundation of China(No.51974138)
the Natural Science Foundation of Jiangxi Province,China(No.20202BABL214022)
the Research Startup Fund Project of JXUST,China(Nos.jxxjbs17032,jxxjbs19019).
