کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6969960 1453042 2016 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Direct extraction of palladium and silver from waste printed circuit boards powder by supercritical fluids oxidation-extraction process
ترجمه فارسی عنوان
استخراج مستقیم پالادیوم و نقره از پلاستیک مدار چاپی پودر توسط فرآیند استخراج اکسیداسیون مایعات فوق بحرانی
کلمات کلیدی
فلزات گرانبها، تخته مدار چاپی را از بین ببرید، اکسیداسیون آب فوق بحرانی. استخراج مایع فوق بحرانی، بهبود،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
چکیده انگلیسی
The current study was carried out to develop an environmental benign process for direct recovery of palladium (Pd) and silver (Ag) from waste printed circuit boards (PCBs) powder. The process ingeniously combined supercritical water oxidation (SCWO) and supercritical carbon dioxide (Sc-CO2) extraction techniques. SCWO treatment could effectively enrich Pd and Ag by degrading non-metallic component, and a precious metal concentrate (PMC) could be obtained, in which the enrichment factors of Pd and Ag reached 5.3 and 4.8, respectively. In the second stage, more than 93.7% Pd and 96.4% Ag could be extracted from PMC by Sc-CO2 modified with acetone and KI-I2 under optimum conditions. Mechanism study indicated that Pd and Ag extraction by Sc-CO2 was a complicated physiochemical process, involving oxidation, complexation, anion exchange, mass transfer and migration approaches. Accordingly, this study established a benign and effective process for selective recovery of dispersal precious metals from waste materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 318, 15 November 2016, Pages 216-223
نویسندگان
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