Lead-water system, potential diagram

Abstract In the beginning, the mixed potential model, which is generally used to explain the adsorption of collectors on the sulphide minerals, is illustrated. And the collector flotation of several kinds of minerals such as copper sulphide minerals, lead sulphide minerals, zinc sulphide minerals and iron sulphide minerals is discussed in the aspect of pulp potential and the nature of hydrophobic entity is concluded from the dependence of flotation on pulp potential. In the following section, the electrochemical phase diagrams for butyl xanthate/water system and chalcocite/oxygen/xanthate system are all demonstrated from which some useful information about the hydrophobic species are obtained. And some instrumental methods including UV analysis, FTIR analysis and XPS analysis can also be used to investigated sulphide mineral-thio-collector sytem. And some examples about that are listed in the last part of this chapter. 

Figure 4. Potential -pH diagram for the system lead-water at...

Redox potential-pH diagrams can be expanded to cover more complex systems when the concentration of all components are known. For instance, chloride, sulfate, phosphate, and other ions may complex with lead under specified redox potential-pH conditions. The forms of lead in complex water systems can be determined where the concentrations and chemistry of all components are known. However, in natural sediment-water systems, the factors affecting lead chemistry may be in a dynamic state, and the chemistry of all the components is not known. Such is the case with interactions between organic matter and metals. 

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