Nthabiseng Mahlabe

Fundamental studies of the electrochemical behaviour of pyrrhotite

Rest potential, polarisation resistance and anodic polarisation measurements

• Broschiertes Buch

Produktbeschreibung

Flotation is often adversely affected by uncontrolled oxidation, which is also an electrochemical process. Electrochemical measurements showed that the magnetic 4C type pyrrhotite is anodically more reactive than the non-magnetic 6C type pyrrhotite. It was also shown that the non-magnetic 6C type pyrrhotite is a better substrate for oxygen reduction and is less susceptible to oxidation. When pyrrhotite is in contact with pentlandite, under oxygen-saturated conditions, as the amount of pentlandite increases, the reactivity towards oxidation of the mixed mineral system is reduced. The formation of a continuous oxide layer on the surface and an increase in oxide layer thickness with decreasing pentlandite content were observed. In the presence of xanthate the anodic polarisation diagrams of the pure and mixed samples showed a reduction in the maximum anodic peak current, suggesting the presence of xanthate on the surface, which hinders oxidation of the mineral surface. Electrochemical and ToF-SIMS measurements indicated that CO2 treatment of oxidised pyrrhotite samples resulted in depassivation of the oxidised surfaces.

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Produktdetails

• Verlag: LAP Lambert Academic Publishing
• Seitenzahl: 344
• Erscheinungstermin: 8. Mai 2014
• Englisch
• Abmessung: 220mm x 150mm x 21mm
• Gewicht: 530g
• ISBN-13: 9783659529276
• ISBN-10: 3659529273
• Artikelnr.: 40935477

Autorenporträt

Nthabiseng Mahlabe is a Senior Process Engineer in Minerals Processing specialising in Flotation. She received her BSc(Chemical Engineering) with Honours in 2006 at the University of Cape Town. She then completed BEng(Hons)(Metallurgical Engineering) in 2007 and MEng(Metallurgical Engineering) with distinction in 2009 at the University of Pretoria.