کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5460309 1516191 2017 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optimum conditions for extracting rare earth metals from waste magnets by using molten magnesium
ترجمه فارسی عنوان
شرایط بهینه برای استخراج فلزات خاکی کمیاب از آهنرباهای زباله با استفاده از منیزیم مذاب
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی
Liquid-metal extraction using magnesium as a medium was studied to examine its suitability as an environmentally friendly process for recycling rare earth (RE) metals from magnets. To determine the optimum conditions for extracting RE metals, RE extraction experiments were conducted under various conditions. Effects of extraction period, temperature, and magnesium/magnet mass ratio on RE extraction efficiency were investigated. As these parameters were increased, extraction efficiency for neodymium increased and reached almost 100%. The efficiency for dysprosium increased as well but was limited to 60%, and some dysprosium remained in the magnet. It was found that RE metals partially exist as oxide in the initial magnet. It was also found that neodymium oxide was reduced by magnesium but that dysprosium oxide was not reduced completely. RE extraction experiments with calcium added as a reducing agent were therefore conducted, and result showed that extraction efficiency for dysprosium was improved to 74%. All tolds, the optimum conditions for RE extraction (with calcium added to a magnesium/calcium mass ratio of 20) are the extraction time of six hours, the extraction temperature of 1000 °C, and the magnesium/magnet mass ratio of 10.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 703, 5 May 2017, Pages 337-343
نویسندگان
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