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Electrochemical study of pyrite-ovalbumin interaction in relation to flotation

Transactions of Nonferrous Metals Society of China 2013年第9期23卷 2766-2775页

作者： Taki GLER kemal sahbudak Sevil ETNKAYA nal AKDEMR Department of Mining Engineering Mugla Sitki Koman University Department of Metallurgical and Materials Engineering Cumhuriyet University Department of Mining Engineering Cumhuriyet University

Ovalbumin （OVA）, chicken egg albumin, is an environmentally friendly, non-toxic, cheap surface active agent. It has electrochemically active sulfhydryl residues in molecular structure. OVA adsorption on pyrite as an alternative depressant was investigated by cyclic voltammetry, FTIR spectroscopy and flotation. Tests were conducted in a wide potential range in alkaline pH to clarify the role of electrochemical condition on the adsorption mechanisms and the rate of depression. In the absence of OVA, the floatability reached its maxima around slightly oxidizing condition. Beyond the range, it decreased presumably due to the formation of Fe-oxyhydroxides together with the hydrophilic S-containing species. OVA-pyrite interaction occurred in the whole examined potential range. Depressing effect of OVA increased gradually from reducing to slightly oxidizing potential, open circuit potential （OCP） of pyrite, mainly due to weak conformational changes in OVA molecules together with the hydrophobic interaction around OCP. The rate of depression reached its maxima at moderately oxidizing potentials, which was referred to electrostatic attraction. This level was almost kept at higher potentials owing to OVA adsorption as metal-chelates.

关键词： pyrite froth flotation ovalbumin redox reactions depression

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