کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4910297 | 1427611 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterisation of sphalerite and pyrite surfaces activated by copper sulphate
ترجمه فارسی عنوان
ویژگی های سطوح اسفالریت و پیریت فعال شده توسط سولفات مس
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
Adsorption of copper sulphate onto the sphalerite and pyrite surfaces during the selective flotation is not fully understood. In this paper, this phenomenon is investigated by Cryogenic X-ray Photoelectron Spectroscopy (Cryo-XPS) and zeta potential measurements. The Cryo-XPS results have showed that the copper activation occurs in two steps. For sphalerite, surface Zn2+ is substituted by Cu2+ by ion exchange reaction, and then CuS-type layer is formed by reduction of the exchanged Cu2+ to Cu+ and oxidation of surface S2â to Sâ. Cu2+ can also activate pyrite, first, through reduction of Cu2+ to Cu+ and oxidation of surface S2â species to Sâ, then surface Fe2+ is oxidised to Fe3+ by reduction of Sâ to S2â, leading to the formation of CuFeS2-type layer. In the reducing potential of the activation, enhancement of copper adsorption on the pyrite surface is confirmed by XPS. Depth profiling after 10Â min activation revealed copper diffusion into the sphalerite lattice up to 10Â nm, while the thickness of the activation product on pyrite surface was less than 3Â nm. The zeta potential studies confirmed CuS-type layer formation on copper activated sphalerite, whereas the surface product of the activated pyrite was CuFeS2-type. This study leads to a better understanding of sphalerite-pyrite Cu2+ activation during flotation for an effective separation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 100, January 2017, Pages 223-232
Journal: Minerals Engineering - Volume 100, January 2017, Pages 223-232
نویسندگان
Majid Ejtemaei, Anh V. Nguyen,