کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10131115 | 1645538 | 2018 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An electrochemical impedance spectroscopy study of arsenopyrite oxidation in the presence of Sulfobacillus thermosulfidooxidans
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this work, the electrochemical dissolution behavior of arsenopyrite in the presence of Sulfobacillus thermosulfidooxidans was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The CV results implied that the presence of S. thermosulfidooxidans could not affect the oxidation mechanism of arsenopyrite. The EIS diagrams showed different characteristics after different incubation times, indicating the change of arsenopyrite-solution interfacial processes during bioleaching. The arsenopyrite biooxidation was initially controlled by two electrochemical processes, involving arsenic and iron dissolution from arsenopyrite and the oxidation of elemental sulfur film on the arsenopyrite surface, and then the latter was replaced by the diffusion of oxidants (e.g., Fe3+ and O2) or products (e.g., Fe2+). Additionally, high potentials could contribute to the promoted dissolution of arsenopyrite. Under potentials lower than 500â¯mV, the arsenopyrite oxidation was composed of two charge transfer processes, as described above. While the potential was higher than 500â¯mV, the arsenopyrite oxidation was changed into only one charge transfer process. This study would provide some valuable information for the pretreatment practice for refractory gold ores.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 287, 10 October 2018, Pages 106-114
Journal: Electrochimica Acta - Volume 287, 10 October 2018, Pages 106-114
نویسندگان
Sha Deng, Guohua Gu,