کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8011938 1516933 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microbial oxidation of refractory gold sulfide concentrate by a native consortium
ترجمه فارسی عنوان
اکسیداسیون میکروبی از کنسانتره سولفید طلای نسوز توسط یک کنسرسیوم مادری
کلمات کلیدی
بیو اکسید شدن، تمرکز طلای نسوز، کنسرسیوم بومی، تجزیه و تحلیل سینتیکی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی
A defined mesophilic consortium including an iron oxidizing bacterium and a sulfur oxidizing bacterium was constructed to evaluate its ability for bioleaching a flotation concentrate from Andacollo mine in Neuquén, Argentina. Experiments were performed in shake flasks with a pulp density of 10% (w/v), using a basal salt medium containing ferrous iron at pH 1.8. The leaching solutions were analyzed for pH, redox potential (using specifics electrodes), ferrous iron (by UV-Vis spectrophotometry) and metal concentrations (by atomic absorption spectroscopy). The results showed that the consortium was able to reduce the refractory behavior of the concentrate, allowing 91.6% of gold recovery; at the same time, high dissolution of copper and zinc was reached. These dissolutions followed a shrinking core kinetic model. According to this model, the copper solubilization was controlled by diffusion through a product layer (mainly jarosite), while zinc dissolution did not show a defined control step. This designed consortium, composed of bacterial strains with specific physiological abilities, could be useful not only to optimize gold recovery but also to decrease the leachates metallic charge, which would be an environmental advantage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 27, Issue 5, May 2017, Pages 1143-1149
نویسندگان
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