کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
213191 462086 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bioleaching of a pyritic sludge from the Aznalcóllar (Spain) mine spillage at ambient and elevated temperatures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Bioleaching of a pyritic sludge from the Aznalcóllar (Spain) mine spillage at ambient and elevated temperatures
چکیده انگلیسی

Pyritic sludge spilled from the 1998 dam failure in Aznalcóllar, Spain, was subjected to chemical and microbiological leaching tests in shake flasks. The sample contained pyrite as the main sulfide mineral and sphalerite and arsenopyrite in minor amounts. The experiments were carried out at ambient and elevated temperatures (22, 45, and 65 °C) using iron-oxidizing bacteria and thermophilic archaea for inocula. The leaching was monitored by chemical analysis of solution samples and by X-ray diffraction analysis of solids. Elevated temperature accelerated the oxidation of sulfide minerals and the solubilization of Fe, Zn and As. The overall reaction was acid-producing and jarosite was the final sink of precipitated ferric iron formed upon pyrite oxidation. The results demonstrate that sludge oxidation is greatly accelerated by acidophilic microorganisms, leading to dissolution of potentially toxic metals such as As.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 93, Issues 1–2, July 2008, Pages 76–79
نویسندگان
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