کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5757160 | 1622629 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Recovery of gold from waste electrical and electronic equipment (WEEE) using ammonium persulfate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
مهندسی ژئوتکنیک و زمین شناسی مهندسی
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چکیده انگلیسی
This paper presents a novel methodology to recover gold from waste electrical and electronic equipment (WEEE) using ammonium persulfate ((NH4)2S2O8). Gold was recovered as a fine coating using substrate oxidation without shredding or grinding process. The WEEE sample was characterized giving values of Au: 1.05Â g/kg, Fe: 86.00Â g/kg, Ni: 73.64Â g/kg, Cu: 26.65Â g/kg. The effect of (NH4)2S2O8 concentration (0.22-1.10Â M), oxygen (0.0-1.4Â L/min) and L/S ratio (10-30Â mL/g) on the main responses (substrate oxidation and Au recovery) was investigated implementing response surface methodology with numerical optimization. A quadratic model was developed and quantities greater than 98% of Au were recovered. The findings presented suggest that, optimized quantities of ammonium persulfate in aqueous highly oxygenated media could be used to extract superficial gold from WEEE.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Waste Management - Volume 57, November 2016, Pages 113-120
Journal: Waste Management - Volume 57, November 2016, Pages 113-120
نویسندگان
Andrea Alzate, Maria Esperanza López, Claudia Serna,