Cao Mingli, Liu Qi
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada.
J Colloid Interface Sci. 2006 Sep 15;301(2):523-31. doi: 10.1016/j.jcis.2006.05.036. Epub 2006 May 20.
Zinc sulfate is a well-known selective depressant for zinc sulfide minerals such as sphalerite during the flotation of complex Cu-Pb-Zn sulfide ores. It deactivates sphalerite flotation by substituting the activating metal ions, and depresses sphalerite flotation by forming hydrophilic coatings of zinc hydroxyl species on sphalerite surfaces. However, we recently observed that zinc sulfate could also induce coagulation of fine sphalerite particles and such coagulation significantly reduced the mechanical entrainment of the fine sphalerite. Therefore, it seems that the effectiveness of zinc sulfate as a selective sphalerite depressant is not only due to its ability to make mineral surface hydrophilic, which reduces genuine flotation, but also due to its ability to coagulate the mineral, which reduces mechanical entrainment. Zinc sulfate is a "dual function" selective flotation depressant.
在复杂铜铅锌硫化矿的浮选过程中，硫酸锌是一种众所周知的对闪锌矿等硫化锌矿物具有选择性抑制作用的药剂。它通过取代活化金属离子使闪锌矿浮选失活，并通过在闪锌矿表面形成锌羟基物种的亲水涂层来抑制闪锌矿浮选。然而，我们最近观察到硫酸锌还能诱导细粒闪锌矿颗粒发生凝聚，这种凝聚显著降低了细粒闪锌矿的机械夹带。因此，硫酸锌作为选择性闪锌矿抑制剂的有效性似乎不仅归因于其使矿物表面亲水从而降低真正浮选的能力，还归因于其使矿物凝聚从而降低机械夹带的能力。硫酸锌是一种“双功能”选择性浮选抑制剂。
