Jun Wang

Central South University

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Guanzhou Qiu

Central South University

Baojun Yang

Central South University

Wenqing Qin

Central South University

Hongbo Zhao

Central South University

Shichao Yu

Central South University

Maoxin Hong

Central South University

Shitong Liu

Central South University

Rui Liao

Central South University

Minghao Hu

Nanjing University of Aeronautics and Astronautics

Xingxing Wang

Suqian University

Cooperative Institutions

Central South University

Chinese Academy of Sciences

Panzhihua University

University of Chinese Academy of Sciences

Kunming University of Science and Technology

Zhejiang University

Tianjin University

Tsinghua University

Ministry of Education of the People's Republic of China

Harbin Institute of Technology

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Dissolution and passivation mechanisms of chalcopyrite during bioleaching: DFT calculation, XPS and electrochemistry analysis

Minerals Engineering (2016)

Jun Wang Xiaowen Gan Hongbo Zhao Minghao Hu Kaiyun Li

Polysulfide

Passivation

Oxidizing agent

10.1016/j.mineng.2016.09.008

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Citations (119)

Insights into the Surface Transformation and Electrochemical Dissolution Process of Bornite in Bioleaching

Minerals (2018)

Hongbo Zhao Xiaotao Huang Minghao Hu Chenyang Zhang Yisheng Zhang

In this work, density functional theory (DFT) calculations, X-ray photoelectron spectroscopy (XPS) and electrochemistry analysis were combined to analyze the electrochemical dissolution process of bornite during bioleaching. DFT calculations showed that bornite was a conductor with metallic conductivity. The formula of bornite may be (Cu+)5Fe3+(S2−)4 and the surface reconstruction of (111)-S surface was discussed. Electrochemistry and XPS analysis showed that bornite tended to be directly oxidized with high conductivity when the potential was higher than 0.3 V vs. Ag/AgCl. Elemental sulfur (S0), FeOOH and CuS were the main intermediate species on the bornite surface during the oxidation process. The production of S0 and FeOOH on bornite surface can be significantly accelerated with increased redox potential, but no insoluble sulfate (SO42−) formed on bornite surface in 0.3–0.65 V vs. Ag/AgCl. The oxidative dissolution of bornite was significantly accelerated with increasing redox potential, which was one important reason why mixed culture was more effective than single strains of A. caldus and L. ferriphilum in bornite bioleaching. The insoluble SO42− was formed mainly through the chemical reactions in solution and then covered the bornite surface in bioleaching. Based on the obtained results, a model for interpreting the dissolution process of bornite in bioleaching was proposed.

Bornite

10.3390/min8040173

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Citations (16)

Synchrotron Radiation XRD Investigation of the Fine Phase Transformation during Synthetic Chalcocite Acidic Ferric Sulfate Leaching

Minerals (2018)

Chaojun Fang Shichao Yu Xingxing Wang Hongbo Zhao Wenqing Qin

The fine phase transformation process of chalcocite (Cu2S) leaching in acidic ferric sulfate solution was studied by leaching experiments and synchrotron radiation X-ray diffraction (SRXRD) tests. The results showed that the dissolution process of chalcocite was divided into two stages. In the first stage, Cu2S was firstly transformed to Cu5FeS4 and Cu2−xS, then the galvanic effect between Cu5FeS4 and Cu2−xS accelerated the dissolution process of Cu1.8S → Cu1.6S → CuS, and finally Cu5FeS4 was also transformed to CuS. While in the second stage, CuS was transformed to elemental sulfur, which formed the passivation layer and inhibited the leaching of chalcocite. Specifically, Cu5FeS4 was detected during the chalcocite leaching process by SRXRD for the first time. This research is helpful for revealing the detailed leaching process of chalcocite.

Chalcocite

Brushite

Bornite

10.3390/min8100461

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Citations (12)

Efficient recovery of vanadium from calcification roasted-acid leaching tailings enhanced by ultrasound in H2SO4-H2O2 system

Minerals Engineering (2023)

Haoyu Li Qian Ren Jinfeng Tian Shihong Tian Jun Wang

10.1016/j.mineng.2023.108492

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Citations (10)

The Influence of Backwater Al3+ on Diaspore Bauxite Flotation

Minerals (2017)

Chaojun Fang Ziyong Chang Qiming Feng Wei Xiao Shichao Yu

The effect of Al3+ in backwater on the flotation of diaspore bauxite was investigated by micro-flotation tests and the underlying mechanisms were investigated by inductively coupled plasma (ICP) measurement, zeta potential measurements, solution chemistry analyses, and synchrotron near edge X-ray absorption fine structure (NEXAFS) analyses. The ICP measurement results show the concentration of Al3+ in backwater was up to 1 × 10−4 mol/L. The micro-flotation results indicated that backwater Al3+ reduced the flotation recovery of diaspore and improved the flotation recovery of kaolinite at pH 9, which was the pH value used in the industrial flotation. The adsorption of Al3+ species changed the zeta potential, the Al atomic abundance, and the number of active sites on the mineral surface. In particular, the result of solution chemistry analyses and synchrotron NEXAFS analyses show that the Al3+ in backwater was adsorbed on the mineral surface in the form of Al(OH)3 (s), and the bond of –Al–O–Al–(OH)2 or –Al/Si–O–Al–(OH)2 was formed at pH 9. It changed the intensity of hydrogen bond force between minerals and collectors, and resulted in the depression of diaspore flotation and the activation of kaolinite flotation. This study can be used to guide the application of backwater in the flotation of diaspore bauxite in industry.

Diaspore (botany)

Zeta potential

XANES

10.3390/min7100195

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Citations (15)

Intermediates Transformation of Bornite Bioleaching by Leptospirillum ferriphilum and Acidithiobacillus caldus

Minerals (2019)

Maoxin Hong Xingxing Wang Lingbo Wu Chaojun Fang Xiaotao Huang

Bioleaching experiments, electrochemical tests, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were conducted to investigate the intermediates transformation of bornite by Leptospirillum ferriphilum and Acidithiobacillus caldus. The bioleaching experimental results showed that the presence of L. ferriphilum and A. caldus significantly accelerated the bornite bioleaching. In addition, the intermediate species of bornite bioleaching with these two kinds of bacteria were similar. Electrochemical analysis indicated that the dissolution of bornite was an acid-consuming process. The results of XRD showed that intermediate species, namely covellite (CuS), mooihoekit (Cu9Fe9S16) and isocubanite (CuFe2S3), were formed during bornite bioleaching, and a mass of elemental sulfur was formed in the late stage of bioleaching. The Cu 2p photoelectron spectrum revealed that Cu was present in the form of Cu (I) during the bornite bioleaching. Additionally, the S 2p3/2 photoelectron spectrum suggested that S2− and S22− were gradually converted to Sn2−/S0, and the formation of elemental sulfur hindered the further dissolution of the bornite.

Bornite

Covellite

10.3390/min9030159

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Citations (21)

Degradation of norfloxacin by red mud-based prussian blue activating H2O2: A strategy for treating waste with waste

Ecotoxicology and Environmental Safety (2023)

Shitong Liu Jun Wang Yang Liu Baojun Yang Maoxin Hong

The massive accumulation of red mud (RM) and the abuse of antibiotics pose a threat to environment safety and human health. In this study, we synthesized RM-based Prussian blue (RM-PB) by acid solution-coprecipitation method to activate H

Degradation

Prussian blue

10.1016/j.ecoenv.2023.115794

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Citations (7)

Bioleaching of chalcopyrite by moderately thermophilic microorganisms

Bioresource Technology (2012)

Wenqing Qin Congren Yang Shaoshi Lai Jun Wang Kai Liu

Chalcocite

Bornite

Lixiviant

10.1016/j.biortech.2012.11.050

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Citations (68)

The Activation Mechanism of Bi3+ Ions to Rutile Flotation in a Strong Acidic Environment

Minerals (2017)

Wei Xiao Pan Cao Qiannan Liang Hong Peng Hongbo Zhao

Lead hydroxyl compounds are known as rutile flotation of the traditional activated component, but the optimum pH range for flotation is 2–3 using styryl phosphoric acid (SPA) as collector, without lead hydroxyl compounds in slurry solution. In this study, Bi3+ ions as a novel activator was investigated. The results revealed that the presence of Bi3+ ions increased the surface potential, due to the specific adsorption of hydroxyl compounds, which greatly increases the adsorption capacity of SPA on the rutile surface. Bi3+ ions increased the activation sites through the form of hydroxyl species adsorbing on the rutile surface and occupying the steric position of the original Ca2+ ions. The proton substitution reaction occurred between the hydroxyl species of Bi3+ ions (Bi(OH)n+(3−n)) and the hydroxylated rutile surface, producing the compounds of Ti-O-Bi2+. The micro-flotation tests results suggested that Bi3+ ions could improve the flotation recovery of rutile from 61% to 90%, and from 61% to 64% for Pb2+ ions.

Rutile

Phosphoric acid

10.3390/min7070113

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Citations (23)

Cooperative bioleaching of chalcopyrite and silver-bearing tailing by mixed moderately thermophilic culture: An emphasis on the chalcopyrite dissolution with XPS and electrochemical analysis

Minerals Engineering (2015)

Hongbo Zhao Jun Wang Xiaowen Gan Minghao Hu Erxing Zhang

Copper extraction techniques

Hydrometallurgy

10.1016/j.mineng.2015.07.015

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Citations (42)