Depression of Jamesonite and Pyrrhotite

With ethyl xanthate (10 mol/L) as a collector, the. flotation recovery of jamesonite and pyrrhotite as a function of pH is presented in Fig. 5.7 with NaOH as pH modifier and in Fig. 5.8 with CaO as pH modifier. It can be seen from these two figures that both jamesonite and pyrrhotite exhibit good flotation response at 

3 Interfacial Structure of Mineral/Solution in Different pH Modifier Solution 

1 mol/L KNO3 solution, pH is adjusted to 10.0 by NaOH, Ca(OH)2 and Na2C03. The Tafel curves of marmatite electrode in the above solutions are determined as shown in Fig. 5.9. It follows from Fig. 5.9 that the electrochemical parameters of corrosive potential and current are almost not affected by the pH 

If the effect of potential in diffusion layer is considered, then the electrochemical polarization equation is  

The relationship between the over-potential and Ig U will deviate from the Tafel linear area due to the medium affecting the diffusion layer. The effect will gradually disappear and the polarization curves separate each other obviously when the potential is far from zero electric charge potential. This is the reason that COj and Ca(OH) ions have some surfactant action compared with OH ion to form characteristic adsorption more easily and to bring about the change of the capacitance of the double electric charge layer. 

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