Article
Engineering, Chemical
Yuangan Chen, Bo Feng, Chunhui Zhong, Ziming Wang
Summary: The role of hydrogen peroxide (H2O2) in the flotation separation of chalcopyrite and sphalerite was investigated, and selective depression effect of H2O2 on sphalerite was confirmed. The results showed that sphalerite is more easily oxidized and selectively depressed by H2O2 compared to chalcopyrite.
MINERALS ENGINEERING
(2022)
Article
Engineering, Chemical
Changtao Wang, Runqing Liu, Meirong Wu, Qilin Zhai, Yuanjia Luo, Nianwen Jing, Feifei Xie, Wei Sun
Summary: Selective separation of chalcopyrite from sphalerite is achieved using fenugreek gum as an effective depressant. Fenugreek gum shows a selectively inhibiting effect on sphalerite in chalcopyrite flotation. The underlying mechanisms involve weak adhesion of fenugreek gum to chalcopyrite surface and greater adsorption capacity for sphalerite.
MINERALS ENGINEERING
(2022)
Article
Metallurgy & Metallurgical Engineering
Maxim Muravyov, Anna Panyushkina
Summary: Ferric leaching is a widely used hydrometallurgical process, and recent studies have shown differences in the leaching kinetics of sphalerite concentrates when using solutions of ferric sulfate obtained from commercial reagents or bio-oxidation of iron-containing substrates.
Article
Engineering, Chemical
F. K. Crundwell
Summary: This study presents a theoretical framework for understanding the interaction of light with the electronic structure of sphalerite, pyrite and chalcopyrite, and how these factors affect their dissolution rate. The electronic structure of these minerals, particularly the bonding character of the upper valence band, plays a crucial role in determining their color and relative dissolution rate. The theory emphasizes the importance of electron removal from bonding orbitals for dissolution under oxidative conditions.
MINERALS ENGINEERING
(2021)
Article
Metallurgy & Metallurgical Engineering
Qian Wei, Fen Jiao, Liu-yang Dong, Xue-duan Liu, Wen-qing Qin
Summary: The study demonstrates the potential selective depressant role of PAPA in the flotation separation of chalcopyrite and Cu-activated sphalerite, revealing its depression mechanism through contact angle, Zeta potential, FT-IR, and ICP measurements. PAPA selectively depresses Cu-activated sphalerite while remaining floatable chalcopyrite, with excellent complexing ability with Cu2+ and prevention of further sodium diethyl dithiocarbamate (DDTC) adsorption on the sphalerite surface, leading to selective depression and high recovery in flotation tests of artificially mixed minerals.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Geochemistry & Geophysics
Max Frenzel, Panagiotis Voudouris, Nigel J. Cook, Cristiana L. Ciobanu, Sarah Gilbert, Benjamin P. Wade
Summary: Laser ablation-inductively coupled plasma-mass spectrometry and electron-probe microanalysis were used to investigate the trace-element contents of sphalerite, chalcopyrite and pyrite from the Plaka Pb-Zn-Ag deposit. The study found that sphalerite chemistry reliably records the temperature and fS(2) evolution of the system, while chalcopyrite chemistry also shows systematic variations over time. Pyrite was only found in association with early high-temperature mineralization, and As and Se contents in pyrite are consistent with formation temperatures estimated from co-existing sphalerite. Statistical analysis identified dominant geological controls on sphalerite trace-element content, but a similarly detailed analysis was not possible for chalcopyrite and pyrite. Comparing the results for all three minerals indicates systematic variations across the deposit possibly explained by local differences in fluid composition.
MINERALIUM DEPOSITA
(2022)
Article
Geology
Yuehua Zhao, Shouyu Chen, Huan Tian, Jiangnan Zhao, Xiang Tong, Xingshou Chen
Summary: The skarn Cu ore in the Laochang deposit is enriched in various elements, with sulfur isotope compositions suggesting a magmatic source of the sulfur. The high tin contents and moderate cadmium/zinc ratio of chalcopyrite, as well as the high indium contents and zinc/cadmium ratio of sphalerite, indicate that the copper mineralization in the deposit was influenced by high temperature magmatic-hydrothermal fluids.
ORE GEOLOGY REVIEWS
(2021)
Article
Chemistry, Physical
Oleg Dizer, Denis Rogozhnikov, Kirill Karimov, Evgeniy Kuzas, Alexey Suntsov
Summary: This paper investigates the nitric acid dissolution process of natural minerals with the addition of Fe(III) ions and FeS2, and finds that temperature, nitric acid concentration, time, and the additions of Fe(III) ions and FeS2 significantly affect the dissolution degree. Simultaneously adding Fe(III) ions and FeS2 has the greatest effect on the leaching process.
Article
Geochemistry & Geophysics
Kosei Aikawa, Mayumi Ito, Nodoka Orii, Sanghee Jeon, Ilhwan Park, Kazutoshi Haga, Taro Kamiya, Tatsuru Takahashi, Kazuya Sunada, Taisuke Sakakibara, Tatsuhiro Ono, Refilwe S. Magwaneng, Naoki Hiroyoshi
Summary: This study investigates the flotation behaviors of chalcopyrite and sphalerite in model samples simulating copper ores with high Cu/Zn ratios and examines the effect of pyrite on the depression of sphalerite floatability. It demonstrates the effectiveness of zinc sulfate as a depressant for sphalerite and the impact of galvanic interaction between pyrite and chalcopyrite on zinc sulfate's effectiveness.
Article
Microbiology
Aleksandr Bulaev, Vitaliy Melamud
Summary: Bioleaching and chemical leaching were combined in a two-stage process to improve copper extraction from low grade Cu-Zn sulfide concentrate. The bioleaching was conducted in three reactors connected in series, followed by high temperature leaching to recover additional copper and zinc from the solid residue. The results showed that the two-stage leaching significantly increased the bioleaching efficiency and the rate of bioleaching for refractory minerals.
Article
Infectious Diseases
Xintong Zhang, Shuai Dong, Yuanyuan Huang, Hongxi Shi, Xi Chen, Yicun Wang, Yan Li, Donghui Cao, Li Wang
Summary: This study screened and identified a specific peptide, JC-1 ScFv, from a phage-display peptide library, which could bind to the C. albicans cell wall and inhibit its growth, demonstrating potential as a targeted therapy for C. albicans infections.
INFECTION GENETICS AND EVOLUTION
(2022)
Article
Materials Science, Multidisciplinary
Qianfei Zhao, Hongying Yang, Linlin Tong, Ruipeng Jin
Summary: This study investigated the interaction mechanism between the surface of cyanide pyrite and CN- using XPS and ToF-SIMS signals, and determined the contaminant species affecting the contact angle of the pyrite surface. The results showed that the variation of surface contact angle values of pyrite was correlated with the chemical complexity. A ToF-SIMS contact angle model was derived to predict the contact angle on the surface of cyanide pyrite.
Article
Geochemistry & Geophysics
Yuliya Elkina, Aleksandra Nechaeva, Alena Artykova, Aleksandr Kolosoff, Aliya Bugubaeva, Vitaliy Melamud, Andrey Mardanov, Aleksandr Bulaev
Summary: The goal of this study was to investigate the bioleaching of arsenic-containing polymetallic concentrate and the composition of microbial population under different temperatures and in the presence of CO2 and molasses. The results showed that temperature and carbon sources significantly affected metal leaching and microbial population composition.
Article
Electrochemistry
Shubham Patel, Srinivasan Sampath
Summary: In this paper, we report a chalcopyrite phase of zinc tin phosphide (ZnSnP2) as an anode for high rate, rechargeable lithium-ion batteries. In-situ Raman spectroscopy analysis reveals the conversion of chalcopyrite phase to a sphalerite phase upon cycling, which results in stable and reversible capacity at high discharge rates. This phase conversion is significant as synthesizing bulk ZnSnP2 sphalerite phase has been challenging. The reversible capacity achieved after the full phase conversion is 750 mAh g(-1), and the full cell assembly demonstrates stable performance with a discharge capacity of 500 mAh g(-1) at 0.5 Ag-1 and high rate capability up to 15 Ag-1.
BATTERIES & SUPERCAPS
(2022)
Article
Geology
Ales Soster, Viktor Bertrandsson Erlandsson, Milos Velojic, Phillip Gopon
Summary: The Djebel Gustar Zn-Pb deposit in northeastern Algeria is a carbonate-hosted base metal deposit in North Africa. It contains sphalerite in five different types, which vary in texture, mineral assemblage, chemical composition, and UV photoluminescence signature. The sphalerite is enriched in the critical metal Ga, and its concentrations of trace elements are correlated with their photoluminescence color, with Mn2+, Cu+, and Ga3+ being the dominant activators. The Ga enrichment is suggested to be the result of specific formation conditions involving the mixing of different fluids.
ORE GEOLOGY REVIEWS
(2023)