In this study, the effect of cations, Na⁺ and Mg²⁺, in saline water on copper flotation in the presence of calcium bentonite was investigated. It was found that as the concentration of NaCl was increased, the copper recovery initially decreased and then increased to above 99%, while the copper grade initially increased and then decreased. In contrast, as the concentration of MgCl₂ was increased, the copper recovery continuously increased, while the copper grade continuously decreased. The variation of copper recovery and grade was mainly attributed to the synergistic effect of pulp rheology and flotation solution chemistry. The underpinning mechanisms are the compressing electrical double layer and ion-exchange interaction between saline water and bentonite, which occur at the same time. Using saline water slightly affected the pulp rheology with a decrease in copper recovery at low NaCl concentration. Increasing the concentration of cations in saline water might even facilitate the flowing out of exchangeable cations, especially divalent cations, from the interlayer space of bentonite to the solution, resulting in the decrease of copper grade at high salt concentration.

在这项研究中，研究了在钠钙膨润土存在下，盐水中的阳离子Na ⁺和Mg ²⁺对铜浮选的影响。发现随着NaCl浓度的增加，铜的回收率开始下降，然后增加到99％以上，而铜的品位开始上升，然后下降。相反，作为MgCl ₂的浓度铜的回收率不断提高，而铜的品位却不断下降。铜回收率和品位的变化主要归因于纸浆流变学和浮选溶液化学的协同作用。支撑机理是同时发生的压缩双电层和盐水与膨润土之间的离子交换相互作用。在低NaCl浓度下，使用盐水对纸浆流变性有轻微影响，铜回收率下降。增加盐水中阳离子的浓度甚至可能有助于从膨润土的层间空间到溶液中流出可交换阳离子，特别是二价阳离子，导致高盐浓度下铜的品位降低。