Ⅱ.尾矿砂对重金属的吸附作用

I . Adsorption of heavy metals onto ore tailing particles

本文研究了尾矿砂颗粒对Cu,pb,Cd三种重金属离子的吸附作用,以及各种环境条件因素对颗粒表面吸附作用的影响。实验结果表明,细微尾矿砂颗粒对溶液中的重金属离子具有较强烈的吸附作用,并且强烈地依赖于溶液的pH。根据表面络合反应,对尾矿砂颗粒表面基团可能参与的表面络合反应和吸附的重金属形态进行了讨论,并应用简化络合反应模式,求取了尾矿砂颗粒与Cu,Pb,Cd的表面络合形成的条件稳定常数pK_(ad)。

In the part of the paper, the adsorption of Cu2+, Cd2+ and Pb2+ on ore tailing particles has been studies as a function of pH, concentrations of adsor-bates and adsorbent. These results showed that the fine-grained ore tailing particles were excellent scavengers for heavy metal ions. The adsorption was strongly pH-dependent. Conditional adsorption constants of surface complexs of Cu2+, Cd2+, and Pb2+ with ore tailing particles were calculatad by a simplified surface compleation model.