کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1196712 1492966 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Recovery of precious metals from scrap printed circuit boards through pyrolysis
ترجمه فارسی عنوان
بازیابی فلزات گرانبها از صفحات مدار چاپی به وسیله ی پیرولیز
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• Precious metals recovery from RAMs and CPUs through pyrolysis.
• RAMs pyrolysis product has higher heating values with respect to CPUs.
• Precious metals concentrations in the raw material increase after pyrolysis.
• 4.3 MJ/kg and 2.1 MJ/kg can be recovered from RAMs and CPUs pyrolysis.

Pyrolysis process has many advantages, if integrated in the process of precious metals recovery from scrap printed circuit boards (PCB): the reduction of energy costs during the milling phase, the improvement of dissolution efficiency, the reduction of non-metal residue, low production of dioxins and recovery of bromine. Despite this it is not clear if the process can be sustained burning volatile products (oil and gas). For this reason in the paper pyrolysis tests on samples of central processing units (CPU) and random access memories (RAM) are presented. The pyrolysis of central processing units yielded about 90% of char, 4% of tar and 6% of gas. The pyrolysis of random access memories yielded 82% of char, 9% of tar and 9% of gas. Char energy content was about 4300 kJ/kg for random access memories and 2200 kJ/kg for central processing units, tar energy content was about 29,000 kJ/kg for both, while gas heating value was respectively 20 MJ/kg and 18 MJ/kg. Burning all the volatiles obtained from pyrolysis of random access memories and central processing units, respectively 4273 kJ/kg and 2066 kJ/kg of heat can be obtained.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Analytical and Applied Pyrolysis - Volume 111, January 2015, Pages 140–147
نویسندگان
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