Theory and Principles of Electrochemical Interaction between Mineral Species

Reactions on mineral surfaces in which there is a change of oxidation state for the species involved are generally electrochemical in nature. This adds to the complexity of multi-mineral systems, in the sense that, apart from interactions through a common aqueous phase, by for instance dissolution-precipitation reactions, galvanic interactions through electrical contact between minerals must be considered also. Galvanic interactions between minerals will cause the more inert mineral to act predominantly as cathode, and reduction of dissolved oxygen would typically occur on its surface. This will stimulate anodic counter-reactions such as the oxidation of xanthate to dixanthogen or metal xanthates and that of metal sulfides to metal-deficient sulfides or elemental sulfur, all of which will promote hydrophobicity on the surface of the more reactive mineral.

Similarly, contact of a less reactive sulfide mineral particle with more reactive steel, generated in abundance by industrial grinding operations, in the form of loose particles or layers smeared onto the mineral surfaces, may depress the mixed potential of the galvanic couple to such an extent that the oxidation reactions necessary for the hydrophobization of the sulfide surface will be slowed down. In extreme cases, reactions may become thermodynamically impossible.

In the following sections the role of electrochemical interactions in the separation of complex sulfide ores will be further explored. Particular attention will be paid to the use of pulp potential as a monitoring and control tool and the role of electrochemical reactions in the development of hydrophobicity.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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