Electrochemistry Contaminant Ions and Sulfide Mineral Interactions

Most of the sulfide minerals are electronic semiconductors or electrically conductive. This implies that the reactions required for the creation of a hydro-phobic surface on sulfides may be electrochemical. For example, the xanthate ion may be oxidized at an anodic area of a local cell on the mineral surface to form hydrophobic dixanthogen:

The corresponding reduction reaction is the catalytic reduction of oxygen. Apart from this type of electrochemical reaction, electrochemical interaction between dissimilar sulfide minerals of different rest potentials occurs when there is electrical contact between them in a sufficiently conductive electrolyte, and this is of a galvanic nature. For contact of this nature to occur the various sulfides must be either present in composite particles, i.e. middlings, or be brought into such frequent collision contact in the flotation pulp, that significant electrical charge transfer can take place. In the laboratory these phenomena can be studied by electrically connected mineral electrodes, or stirred/fluidized beds made up of sulfide minerals only. Although these laboratory methods indicated significant electrochemical interaction, studies conducted at the authors' laboratories on simulated mineral feed of realistic plant composition showed no significant charge transfer. This was possibly due to the complexity of the flotation pulp chemistry, which makes it difficult to distinguish between the contribution of chemical and electrochemical processes to overall plant performance.

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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