Effect of pH on surface potential and floatability of ore particles

The ions in the inner layer and the dense layer of the electric double layer have an influence on the surface potential value of the ore particles, which is called a positioning ion. Positioning constituent ions are generally mineral lattice, such as pb ²⁺ and S ^2- ion is positioned in galena. For some insoluble oxides and silicate minerals, H ⁺ and OH ^- are their localization ions. The positioning ions can pass through the solid-liquid interface and try to establish a balance at the interface to form a certain zeta potential and zeta potential.
Because H ⁺ and OH ^- are some of the localized ions that are difficult to dissolve oxides and silicate minerals. Different pH values ​​indicate different concentrations of H ⁺ and OH ^{- in the solution} . The larger the pH, the higher the alkaline solution, wherein the OH ^- more mineral particles adsorbed on the surface after it has established a balance of ions in the ore particle surface adsorption of the more OH-. Conversely, the smaller the pH, the more H ⁺ in the solution, and the more H ⁺ adsorbed on the surface of the ore. Therefore, the pH value directly affects the surface potential of the ore particles.

H ⁺ and OH ^- are the localized ions of quartz ; the figure above shows the effect of several electrolytes on the zeta potential of quartz. As can be seen from the above figure, the solution is made alkaline with NaOH, and the zeta potential of quartz affects the situation. As can be seen from the above figure, the solution is made alkaline with NaOH, and the zeta potential of quartz is -70 to 120 mV. As the amount of HGI increases, the pH of the solution decreases. When the pH is about 3.7, the amount of HCI is continuously increased to make the zeta potential positive. The PH value when the zeta potential is zero is called the isoelectric point. Similarly, the pH at which the zeta potential is zero is referred to as the zero point. When the ψ value is zero, the ζ value is also zero, but the ψ value is not zero, and the ζ value can also be zero. Because when the ionic strength in the solution is large, the different ions in the diffusion layer may be squeezed into the dense layer, so that the tributing ions in the sliding surface are electrically equivalent to the positioning ions.
In the flotation of some oxidized ore (such as quartz), the collector acts on the electrostatic attraction and minerals. For this reason, the collector ions must act as the opposite ion in the dense layer of the electric double layer, and the electricity of the inner layer ions Sexuality can play a role in the country. When the pH is lower than the isoelectric point, the surface of the mineral is positively charged, and an anionic collector should be used. When the pH is higher than the isoelectric point, the surface of the mineral is negatively charged, and a cationic collector should be used.

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