Adsorption of collectors and modifying reagents in the flotation of oxide and silicate minerals is controlled by the electrical double layer at the mineral-water interface. In systems where the collector is physically adsorbed, flotation with anionic or cationic collectors depends on the mineral surface being charged oppositely. Adjusting the pH of the system can enhance or prevent the flotation of a mineral. Thus, the point of zero charge (PZC) of the mineral is the most important property of a mineral in such systems. The length of the hydrocarbon chain of the collector is important because of chain-chain association enhances the adsorption once the surfactant ions aggregate to form hemimicelles at the surface. Strongly chemisorbing collectors are able to induce flotation even when collector and the mineral surface are charged similarly, but raising the pH sufficiently above the PZC can repel chemisorbing collectors from the mineral surface. Zeta potentials can be used to delineate interfacial phenomena in these various systems.

中文翻译：

---

氧化物和硅酸盐矿物浮选中的ζ电位。

氧化物和硅酸盐矿物浮选过程中捕收剂和改性剂的吸附是由矿物质-水界面的双电层控制的。在收集器被物理吸附的系统中，用阴离子或阳离子收集器进行浮选取决于带相反电荷的矿物表面。调节系统的pH值可以增强或防止矿物的漂浮。因此，矿物的零电荷点（PZC）是此类系统中矿物的最重要属性。捕收剂的烃链的长度很重要，因为一旦表面活性剂离子聚集在表面形成半胶束，链-链缔合就会增加吸附。即使吸附剂和矿物表面的电荷相似，强吸附剂也能引起浮选，但是将pH值充分提高到PZC以上可以排斥矿物表面的化学吸附捕集剂。Zeta电位可用于描述这些各种系统中的界面现象。