Semiconducting characteristics of galena electrodes. Relationship to mineral flotation.
J Electrochem Soc 1985 Jun; 132(6):1350-1356
Electrochemical, interfacial capacitance, and surface photovoltage 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 (saturated calomel electrode), and highly p-type electodes have a value of - -0.2 V (saturated calomel electrode). The space charge is readily varied by applied potentials in the range -0.2V to -0.6 V. This report discusses the effect of the variable space-charge layer on oxygen reduction and xanthate chemisorption.
Mining-industry; Mineral-processing; Metals;
Author Keywords: semiconductor material; selectrochemical electrodes; minerals; sulphur compounds; reduction (chemical); chemisorption
OP; Journal Article
Journal of the Electrochemical Society