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Semiconducting Characteristics of Galena Electrodes: Relationship to Mineral Flotation
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1985
Year
EngineeringChemistryOxygen ReductionMineral ProcessingCorrosionMineral-fluid InteractionCharge ExtractionElectrode Reaction MechanismMaterials ScienceSurface ElectrochemistryElectrochemical ProcessFlotation ConcentrationElectrochemistryCleavage PotentialP‐type ElectrodesSurface ScienceFundamental ElectrochemistryMineral FlotationGeochemistryElectrochemical Surface Science
Electrochemical, interfacial capacitance, and surface photovoltage (SPV) measurements have been used in a study of oxygen reduction and xanthate chemisorption on in situ cleaved natural and synthetic lead sulfide crystals. Electrodes cleaved in nitrogen‐sparged 0.1M sodium tetraborate assume the flatband potential, , at the instant of cleavage, and thus the cleavage potential decreases with increasing bulk electron concentration. Highly n‐type electrodes have a cleavage potential of ≃−0.6V (SCE), and highly p‐type electrodes have a value of ≃−0.2V (SCE). The space charge is readily varied by applied potentials in the range −0.2 to −0.6V. This Bureau of Mines, U.S. Department of the Interior, report discusses the effect of the variable space‐charge layer on oxygen reduction and xanthate chemisorption.