کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8869410 | 1622608 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Recovery of base metals, silicon and fluoride ions from mobile phone printed circuit boards after leaching with hydrogen fluoride and hydrogen peroxide mixtures
ترجمه فارسی عنوان
بازیابی فلزات پایه، سیلیکن و فلوراید از صفحات مدار چاپی تلفن همراه پس از اشباع با فلوراید هیدروژن و مخلوط های پراکسید هیدروژن
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی
The recovery of copper, nickel, zinc, silicon, iron, aluminum, tin and fluoride ions from fluoride leach liquors of non-ground printed circuit boards (PCBs) from mobile phones is described in detail. These PCBs were leached with HFâ¯+â¯H2O2 mixtures after previous treatment with 6â¯molâ¯Lâ1 NaOH (removal of the solder mask). A combination of solvent extraction (SX) and precipitation techniques was used. 99.5â¯wt% zinc, copper and nickel, in this order, were extracted in one stage (Zn, Ni) or two stages (Cu) with di-2-ethylhexylphosphoric acid (D2EHPA) diluted in kerosene (25â¯Â°C, A/Oâ¯=â¯1 v/v) after adjusting the pH of the leachate. They were easily stripped by aqueous H2SO4. Iron, aluminum and tin did not interfere because they were masked by fluoride ions. Iron and aluminum were precipitated together as Na3FeF6â¯+â¯Na3AlF6 by careful addition of aqueous NaOH. Silicon, tin and fluoride ions were recovered together (Na2SiF6â¯+â¯Na2SnF6â¯+â¯NaF) by careful evaporation of the aqueous solution after SX of nickel. The tin salt was leached from this solid by absolute ethanol. High HF concentration (10â¯molâ¯Lâ1) in the leachant affected SX of Cu(II) and precipitation of iron/aluminum flurocomplexes since some NaF partially precipitated at acidic pH.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Waste Management - Volume 78, August 2018, Pages 781-788
Journal: Waste Management - Volume 78, August 2018, Pages 781-788
نویسندگان
Walner Costa Silva, Roger de Souza Corrêa, Calvin Sampaio Moreira da Silva, Júlio Carlos Afonso, Rubens Souza da Silva, Cláudio Augusto Vianna, José Luiz Mantovano,