کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8011699 1516923 2018 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interfacial reactions of chalcopyrite in ammonia-ammonium chloride solution
ترجمه فارسی عنوان
واکنش های متقابل چالکوپییریت در محلول آمونیوم کلرید
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی
The interfacial reactions of chalcopyrite in ammonia-ammonium chloride solution were investigated. The chalcopyrite surface was examined by scanning electron microscopy and X-ray photoelectron spectroscopy (XPS) techniques. It was found that interfacial passivation layers of chalcopyrite were formed from an iron oxide layer on top of a copper sulfide layer overlaying the bulk chalcopyrite, whereas CuFe1-xS2 or copper sulfides were formed via the preferential dissolution of Fe. The copper sulfide layer formed a new passivation layer, whereas the iron oxide layer peeled off spontaneously and partially from the chalcopyrite surface. The state of the copper sulfide layer was discussed after being deduced from the appearance of S2-, S2−2, S2−n, S0 and SO2−4. A mechanism for the oxidation and passivation of chalcopyrite under different pH values and redox potentials was proposed. Accordingly, a model of the interfacial reaction on the chalcopyrite surface was constructed using a three-step reaction pathway, which demonstrated the formation and transformation of passivation layers under the present experimental conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 28, Issue 3, March 2018, Pages 556-566
نویسندگان
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