کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4769280 1425533 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A novel bio-oxidation and two-step thiourea leaching method applied to a refractory gold concentrate
ترجمه فارسی عنوان
روش جدید بیوشیمی اکسیداسیون و دو مرحله ای لیشده تیووره به یک کنسانتره طلای نسوز اعمال شده است
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
Biooxidation-thiourea (TU) leaching is considered to be a more environmentally friendly and efficient method than cyanidation to recover gold from refractory sulfide gold-bearing ores/concentrates. However, high consumption of the TU reagent and additional oxidants hinders its commercial adoption. In this work, single TU leaching and novel two-step TU leaching processes were designed and performed after the biooxidation of refractory sulfide gold-bearing concentrate from Axi, China. The novel method contained an additional six-hour bioprocess and a six-hour lixiviant leaching. During the two-step TU leaching, the microbes remaining on the residue from biooxidation regenerated Fe3 + as oxidant. Compared with the highest gold recovery rate of the single TU leaching (92.2 ± 1.54%), which had additional Fe3 + and Na2SO3 supplied after prewashing, the rate reached 95.0 ± 0.73% in the two-step TU leaching process without additional oxidant and reductant. A microbial community analysis by 16S rRNA gene amplicon sequencing indicated that the genera Acidithiobacillus and Leptospirillum greatly contributed to the regeneration of ferric ions during the two-step TU leaching process and further improved the recovery of gold. As a non-cyanide method, combining the two-step TU leaching process with biooxidation takes full advantage of the microorganisms and is worthy for industrial application.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 171, August 2017, Pages 213-221
نویسندگان
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