کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1635800 1516950 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sulfur composition on surface of chalcopyrite during its bioleaching at 50 °C
ترجمه فارسی عنوان
ترکیب گوگرد در سطح کلوپوئید در طول بیولوژیک آن در 50 درجه سانتی گراد
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی
The composition of passive layer of chalcopyrite was investigated by X-ray photoelectron spectroscopy (XPS), accompanied with cyclic voltammetry (CV). The leaching experiment shows that the extraction rates of Cu with leaching for 30 d by sterile control and microorganisms are 4.0% and 21.5%, respectively. In comparison, 3.8% and 10.5% Fe are leached by sterile control and microorganisms, respectively. The results of XPS studies suggest that Fe atoms dissolve preferentially from the chalcopyrite lattice, and disulfide (S22−), polysulfide (Sn2-) and elemental sulfur (S0) are identified on the chalcopyrite surfaces leached by sterile control and microorganisms. Additionally, sulfate (SO42-) is detected on the chalcopyrite surfaces leached by microorganisms, and most of it probably originates from jarosite. The analysis of CV results reveals that metal-deficient sulfide (Cu1-xFe1-yS2-z, y>x) and elemental sulfur (S0) passivate the surface of chalcopyrite electrode. The elemental sulfur and/or jarosite coating on the chalcopyrite surface may have impact on the leaching process; however, the disulfide, polysulfide or metal-deficient sulfide plays a more key role in the chalcopyrite leaching.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 25, Issue 12, December 2015, Pages 4110-4118
نویسندگان
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