2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 5: Starkey Intl. Symp. / Mineral Processing

Editors:Kongoli F, Kumar P, Senchenko A, Klein B, Silva A.C., Sun C, Mingan W
Publisher:Flogen Star OUTREACH
Publication Year:2016
Pages:270 pages
ISBN:978-1-987820-44-7
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    studies on the oxidation behaviour of pyrite under different system

    Li Peng1; Hui Xuede1;
    1CHINA GOLD SCIENCE AND TECHNOLOGY CO.LTD., Beijing, China;
    Type of Paper: Regular
    Id Paper: 455
    Topic: 5

    Abstract:

    In this paper, Electrochemical analysis technology was utilized to study the behavior of pyrite under different system. The result of cyclic voltammetry showed that the process of pyrite anode reaction consists of multi-step. Through the redox potential information obtained from the cyclic voltammetry curve, consolidating the intermediate reaction process, pyrite was oxidized to ferric ion and sulfate finally. Studies on Tafel polarization curve under acidic, ferric ion and inoculation condition showed that pyrite was more susceptible to be oxidized and oxidation rate was faster in presence of bacteria. The corrosion current was 1.41uA under acidic condition, the corrosion current was 123.49 uA under ferric ion (c(Fe3+)=1.0g﹞L-1) condition and the corrosion current was up to 142.40 uA. The polarization resistance was up to 1.84，106 次﹞cm-2 under acidic condition, and the polarization resistance was respectively 7.59，104 次﹞cm-2 and 2.30，104 次﹞cm-2 under ferric ion and inoculation condition. The leaching test of pyrite in presence and absence of bacteria showed that the presence of bacteria could significantly improve the leaching rate of pyrite. The leaching rate of pyrite was 12.94% under acidic condition after eighteen days, the leaching rate was 36.01% under ferric ion. However, the leaching rate of pyrite was up to 89.46% in presence of bacteria, which was 6.91 times higher than the one without bacteria.

    Keywords:

    Control; Extraction; Iron; Performance; Principles; Technology;

    References:

    [1]Sasaki K., Tsunekawa M., Ohtsuka T., et al.: Confirmation of a sulfur-rich layer on pyrite after
    oxidative dissolution by Fe(lIl) ions around pH2, Geochimica et Cosmochimica Acta, 1995,
    59(15): 3155-3158.
    [2]Chen Shiguan: Bioleaching and its application in nonferrous metallurgy, Shanghai Nonferrous
    Metals, 2000, 21(3): 137-146.
    [3]3Song Jian: Studies on The Leaching Mechanism Mathematical Model and Bioleaching of
    Sulfide Mine, Jinan: Shandong University, 2010.
    [4]Li Hongxu. Study on electrochemical mechanism and leaching process of sulfide mine,
    Changsha: Central South University, 2001.
    [5]Yang Xianwan. Microorganism hydrometallurgy, Beijing: Metallurgical Industry Press, 2003,
    2-145.

    Cite this article as:

    Peng L and Xuede H. studies on the oxidation behaviour of pyrite under different system. In: Kongoli F, Kumar P, Senchenko A, Klein B, Silva A.C., Sun C, Mingan W, editors. Sustainable Industrial Processing Summit SIPS 2016 Volume 5: Starkey Intl. Symp. / Mineral Processing. Volume 5. Montreal(Canada): FLOGEN Star Outreach. 2016. p. 229-244.