Next Article in Journal
Towards Greener Lixiviants in Value Recovery from Mine Wastes: Efficacy of Organic Acids for the Dissolution of Copper and Arsenic from Legacy Mine Tailings
Previous Article in Journal
Effects of Superplasticizer on the Hydration, Consistency, and Strength Development of Cemented Paste Backfill
Previous Article in Special Issue
(Bio)leaching Behavior of Chromite Tailings
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Minerals 2018, 8(9), 382; https://doi.org/10.3390/min8090382

Synchrotron Radiation Based Study of the Catalytic Mechanism of Ag+ to Chalcopyrite Bioleaching by Mesophilic and Thermophilic Cultures

1
Key Lab of Biometallurgy of Ministry of Education of China, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
2
CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
3
College of Science, Hunan University of Technology, Zhuzhou 41000, China
4
Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 10049, China
5
Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
*
Author to whom correspondence should be addressed.
Received: 25 July 2018 / Revised: 27 August 2018 / Accepted: 31 August 2018 / Published: 3 September 2018
(This article belongs to the Collection Bioleaching)
Full-Text   |   PDF [3266 KB, uploaded 14 September 2018]   |  

Abstract

The catalytic mechanism of Ag+ for chalcopyrite bioleaching by mesophilic culture (at 30 °C) and thermophilic culture (at 48 °C) was investigated using synchrotron radiation-based X-ray diffraction (SR-XRD) and S K-edge and Fe L-edge X-ray absorption near edge structure (XANES) spectroscopy. Bioleaching experiments showed that copper extraction from chalcopyrite bioleaching by both cultures was promoted significantly by Ag+, with more serious corrosion occurring on the minerals surface. SR-XRD and XANES analyses showed that the intermediates S0, jarosite and secondary minerals (bornite, chalcocite and covellite) formed for all bioleaching experiments. For these secondary minerals, the formation of bornite and covellite was promoted significantly in the presence of Ag+ for both cultures, while Ag+ has almost no effect on the formation of chalcocite. These results provided insight into the catalytic mechanisms of Ag+ to chalcopyrite bioleaching by the mesophilic and thermophilic cultures, which are both probably due to the rapid formation of bornite by Ag+ and the conversion of bornite to covellite. View Full-Text
Keywords: chalcopyrite; bioleaching; Ag+; mesophilic culture; thermophilic culture; SR-XRD; XANES chalcopyrite; bioleaching; Ag+; mesophilic culture; thermophilic culture; SR-XRD; XANES
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Nie, Z.; Zhang, W.; Liu, H.; Xia, J.; Zhu, W.; Zhang, D.; Zheng, L.; Ma, C.; Zhao, Y.; Wen, W. Synchrotron Radiation Based Study of the Catalytic Mechanism of Ag+ to Chalcopyrite Bioleaching by Mesophilic and Thermophilic Cultures. Minerals 2018, 8, 382.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Minerals EISSN 2075-163X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top