Activation Flotation

It can be seen that Cu(OH)2 may exist on the electrode surface as well as CU2S and CuS. The existence of element S depends on the oxidation potential. Anode peaks appearing in inverse scan are sequentially associated with reaction (6-9), the back reaction of reaction (6-12) and reduction reaction of element S (HS is the reduction product). 

In high alkaline media (pH = 12.8), where the upper limit of the scan potential is carried to 0.2 V, the anode peak is similar to the above and corresponds to the reaction that CU2S is oxidized to CuS and S-CuS. The anode peaks at the potential varying from 0.1 V to 0.2 V may contain reaction (6-12), reaction (6-7) and reaction (6-10). 

At that moment, the products at the electrode surface may comprise of CU2S, CuS, Cu(OH)2 and element S, so that there appears a series of cathode peaks which indicate the corresponding back reactions. 

According to the analyses of the above cyclic voltammogram results, it can not be determined that the active products at the sphalerite surface is CU2S or CuS. However this phenomenon may imply the essence of the process itself. It suggests that in the ZnS - CUSO4 system the Cu concentration in active products keeps equilibrium with that in solution, which is strictly controlled by chemical potential. When the working potential is lower than the rest potential of CuS, the 

When the working potential is higher than the rest potential of CuS, sulphide will partly lose element Cu to form low Cu/S ratio compound. 

---

Chapter 6 Electrochemistry of Activation Flotation of Sulphide Minerals... 

Figure 6.4 to Fig. 6.6 show the effect of pulp potential on the copper activation flotation of marmatite, arsenop5nrite and pyrrhotite in the presence of lO " mol/L Cu with 10" mol/L butyl xanthate as a collector. It is obvious that marmatite, arsenopyrite and pyrrhotite appear to have better flotation response at certain potential range at different pH conditions. 

Influence of Pulp Potential on the Copper Ion Activating Flotation of Zinc-Iron Sulphide Minerals in the Presence of Depressant... 

Stronger depressing action on arsenopyrite even in the presence of copper ion and does not influence the copper ion activation flotation of marmatite. 

Table 6.2 The results of activation flotation of lime-depressed pyrite ore from the tailing of flotation of Pb-Zn sulphide ores...

Solution Chemistry Studies on Activation Flotation of Lime-Depressed Pyrite... 

We employ density functional theory to calculate the electron structures of bulk sphalerite, and the pure and doped ZnS (110) surface in order to explain the effect of Cu and Fe ions on the properties of ZnS and the mechanism of activation flotation of sphalerite. 

Solution equilibria of flotation reagents. Solution equilibria of various surfactants such as collectors, frothers, modifiers, and flocculants, encompass acid-base equilibria, dissociation equilibria, association equilibria and polymer equilibria. Using these equilibria and also various parameters such as the pH of the solutions and the critical pH of the dissolution of insoluble flotagents, pA(a can be calculated and the state of active flotation reagent species in solution predicted. 

Amine D . [Hercules] Dehydro-abietylamine asphalt active flotation reagent fix ixod. of algicides, jxe-servadves, ccxrosion inhibitors. 

---