کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
213559 462110 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Studies on the preparation of pure ammonium para tungstate from tungsten alloy scrap
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Studies on the preparation of pure ammonium para tungstate from tungsten alloy scrap
چکیده انگلیسی

Ammonium paratungstate was prepared from tungsten alloy swarf employing anodic dissolution in sodium hydroxide using a packed bed configuration followed by chemical conversion into ammonium tungstate through tungstic acid. The alkaline tungstate solution was dialysed to recover sodium hydroxide, which could be recycled to the electrolytic dissolution. The influence of anodic current density and other parameters on dissolution/recovery was studied and discussed. It was observed that a current density of 600 mA/100 g scrap could be applied when the concentration of NaOH was maintained around 2.5 M. The energy consumption for anodic dissolution was 2.14 kWh/kg W with more than 90% recovery achieved. XRD studies indicated that the exhausted scrap contained an alloy of nickel and iron with a very low percentage of tungsten. APT sample prepared through anodic dissolution in NaOH was characterized.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 85, Issues 2–4, March 2007, Pages 67–71
نویسندگان
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