Bio-Oxidation of a Double Refractory Gold Ore and Investigation of Preg-Robbing of Gold from Thiourea Solution
| العنوان: | Bio-Oxidation of a Double Refractory Gold Ore and Investigation of Preg-Robbing of Gold from Thiourea Solution |
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| المؤلفون: | Xu Bin, Huaqun Yin, Qian Li, Rui Xu, Yongbin Yang, Tao Jiang, Feiyu Meng |
| المصدر: | Metals, Vol 10, Iss 1216, p 1216 (2020) Metals Volume 10 Issue 9 |
| بيانات النشر: | MDPI AG, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | lcsh:TN1-997, Passivation, 0211 other engineering and technologies, chemistry.chemical_element, 02 engineering and technology, engineering.material, chemistry.chemical_compound, Adsorption, green technology, Jarosite, preg-robbing, General Materials Science, Fourier transform infrared spectroscopy, lcsh:Mining engineering. Metallurgy, 021102 mining & metallurgy, Metals and Alloys, 021001 nanoscience & nanotechnology, bio-oxidation, thiourea leaching, Thiourea, chemistry, engineering, double refractory gold ore, Leaching (metallurgy), 0210 nano-technology, Carbon, Gold extraction, Nuclear chemistry |
| الوصف: | Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. ferrooxidans, and a mixed culture containing A. ferrooxidans and L. ferrooxidans was investigated. The results showed that direct thiourea leaching of the as-received DRGO yielded only 28.7% gold extraction, which was due to the encapsulation of sulfides on gold and the gold adsorption of CM. After bio-oxidation, thiourea leaching of the DRGO resulted in gold extraction of over 75&ndash 80%. Moreover, bio-oxidation can effectively reduce the adsorption of carbon to gold. XRD, SEM-EDS and FTIR analysis showed that many oxygen-containing groups were introduced on the surface of DRGO during bio-oxidation, while the C=C bond was cleaved and the O&ndash C&ndash O and C&ndash N bonds were degraded, causing a decrease in active sites for gold adsorption. Moreover, passivation materials such as jarosite were formed on the surface of DRGO, which might reduce the affinity of CM for gold in solutions. In addition, the cleavage of the S&ndash S band indicated that sulfides were oxidized by bacteria. This work allows us to explain the applicability of pre-bio-oxidation for degrading both sulfides and CM and increasing gold recovery from DRGO in the thiourea system. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2075-4701 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e0a1531c2e1a6af26a634936e437def https://www.mdpi.com/2075-4701/10/9/1216 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....5e0a1531c2e1a6af26a634936e437def |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20754701 |
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