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
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کلمات کلیدی
زباله کلکوپیریت، لایه غیر فعال الکتروشیمی
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 (S22â), 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
Journal: Transactions of Nonferrous Metals Society of China - Volume 25, Issue 12, December 2015, Pages 4110-4118
نویسندگان
Shi-fa WU, Cong-ren YANG, Wen-qing QIN, Fen JIAO, Jun WANG, Yan-sheng ZHANG,