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Impact of ovalbumin on pyrite flotation in the absence and presence of metal ions

Guler T., Sahbudak K., Akdemir U., Cetinkaya S.

Physicochemical Problems of Mineral Processing

2014

Vol. 50, iss. 1

31--40

Recovery of gangue pyrite and its accidental activation are vital issues in flotation of complex sulfide ores. This work was performed by cyclic voltammetry (CV) and flotation tests to elucidate applicability of ovalbumin (OVA) as depressant for pyrite. The synergetic effect of metal ions in addition to its possible use in case of accidental activation by metal ions. CV tests stated that OVA adsorbed irreversibly on pyrite, and restricted electron transfer up to moderately oxidizing potentials due to electrostatic interaction together with weak hydrophobic interactions. At highly oxidizing potentials, adsorption occurred through electrochemical mechanisms through formation of metal-OVA chelates. Rate of pyrite depression with OVA was found to be potential dependent reaching its peak point around moderately oxidizing potentials both in absence and presence of metal ions. Electrochemically active metals display synergetic effect with OVA on pyrite depression, whereas noble metals activate pyrite and reduced depressing potency of OVA.

Bacterial Leaching as a pre-treatment step for gold recovery from refractory ores.

Ozkan A., Aydogan S., Akdemir U.

Fizykochemiczne Problemy Mineralurgii

1998

Vol. 32

173-181

In this article, pre-treatment such as bio-leaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite. There are two methods of bacterial leaching, namely stirred reactor bi-leaching and bio-heap leach processes. The examples of industrial applications and economics of bacterial leaching are give in detail.

Omówiono bioługowanie jako alternatywna technikę przerobu trudno ługowalnych rud złota zawierających obok złota piryt i arsenopiryt. Istnieją dwie metody ługowania na hałdzie. Szczegółowe opisano przykłady przemysłowego zastosowania ługowania bakteryjnego i jego ekonomikę.