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Structural and thermoelectric properties of copper sulphide powders

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Journal of Semiconductors 2018年第12期39卷 1-5页

作者： A.Narjis A.Outzourhit A.Aberkouks M.El Hasnaoui L.Nkhaili Nanomaterials for Energy and Environment Laboratory Physics Department Faculty of Sciences Semlalia Cadi Ayyad University Laboratoire de chimie de Coordination et de Catalyse Département de Chimie Faculté des Sciences Semlalia LASTID Laboratory Physics Department Faculty of Sciences Ibn Tofail University

Over the past few years, Cu-based materials have been intensively studied focusing on their structural and thermoelectric properties. In this work, copper sulphide powders were synthesized by the sol-gel method. The chemical composition and the morphological properties of the obtained samples were analyzed by X-ray diffraction, differential thermal analysis, and scanning electron microscopy. It is shown that the decomposition from one phase to another can be obtained by annealing. The electrical resistivity and the crystallite size were found to be strongly affected by the phase transition. Thermoelectric analyses showed that the digenite phase exhibits the highest power factor at room temperature. The Seebeck coefficient of the compound Cu1.8S shows a pronounced peak at the γ-β transition temperature. This behavior was statistically explained in terms of a dramatic increase in the disorder in the atoms-carriers ensemble.

关键词： copper sulphide thermoelectricity annealing temperature phase transition

Interaction effects of flotation reagents for SAG mill reject of copper sulphide ore using response surface methodology

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Transactions of Nonferrous Metals Society of China 2021年第3期31卷 792-806页

作者： Ali AHMADI Mojtaba REZAEI Seyed Mohammad SADEGHIEH Department of Mining Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran

Flotation reagents have a complex behaviour in the beneficiation of base minerals in clayey *** effects of reagents on the efficiency of copper flotation for a highly clayey low-grade sulphide ore were investigated using a central composite *** results showed that sodium-isopropyl-xanthate(SIPX)and O-isopropyl-N-ethyl-thionocarbamate(IPETC)were found to be the most efficient collectors in the presence of lime as the pH *** effects of dosage of collectors(SIPX and IPETC)and the dosage of methyl-isobutyl-carbonyl(MIBC)as frother on the separation efficiency were evaluated at different pH *** on the analysis of variance(ANOVA),the interaction effects of the collector−pH and collector−frother were significant for the separation *** the low level of collector dosage,increasing pH from 9 to 11 enhanced copper separation efficiency from 81%to 86%for IPETC and from 77%to 86%for *** of ANOVA showed that the maximum copper separation efficiency(88.7%)was obtained at the dosages of 8.6 g/t SIPX,7 g/t IPETC and 20 g/t MIBC at pH ***,it was concluded that a mixture of SIPX and IPETC collectors was more suitable to treat highly clayey sulphide ores.

关键词： flotation copper sulphide reagent interaction effect reject ore

X-Ray Photoelectron Spectroscopic Study on the Synthesis of copper sulphide in LB Films( Ⅱ )

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Chemical Research in Chinese Universities 1992年第4期8卷 395-398页

作者： CHEN Hui-juan, CHAI Xiang-dong, WEI Quan , JIANG Yue-shun and LI Tie-jin (Department of Chemistry, Jilin University, Changchun, 130023)

The present paper covers the formation process of copper sulphide in copper stearate Langmuir-Blodgett films studied carefully by XPS. The further identification of sulfur species and the examination of its change in the reaction have been made. Also the formation mechanism of sulfur species in the special microenvironment-LB films is discussed.

关键词： XPS LB film copper sulphide

Leaching Behavior of Complex copper sulphide　Concentrate　with　Ferric　Chloride　by　Microwave　Irradiation

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Rare Metals 1997年第2期16卷 73-76页

作者：丁伟安北京有色金属研究总院北京

Microwave assisted leaching of complex copper sulphide concentrate with ferric chloride was investigated, and its mechanism was analyzed. The results show that the leaching rate by microwave irradiation heating is mu... 详细信息

关键词： copper sulphide Concentrate Leaching Microwave irradiation heating

Simulation of solute transportation within porous particles during the bioleaching process

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International Journal of Minerals,Metallurgy and Materials 2010年第4期17卷 389-396页

作者： Sheng-hua Yin Ai-xiang Wu Shao-yong Wang Hong-jiang Wang School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China School of Mechanical Engineering University of Western Australia Perth 6009 Australia

A mathematical model, accounting for the sulfuric acid and ferric ions diffusion and the copper sulfide mineral leaching process, was developed for an ore particle by considering its porous structure. It was simulated with the simulation tool COMSOL Multiphysics. The simulation results show that the highest acid and ferric concentrations near the particle surface are apparent, while the concentrations in the central particle increase slightly as the less-porous ore core with low permeability prevents the oxidation from penetrating. The extraction of the mineral near the particle surface is the maximum, mainly because of ample sulfuric acid, ferric ions, bacteria, and oxygen available for the leaching process. Because of low oxidation concentration in the central part of the particle, the reaction rate and copper sulphide conversion are small. The simulation shows good agreement with the experimental results.

关键词： simulation solute transportation bioleaching copper sulphide porous particle

Directional construction of Cu2S branch arrays for advanced oxygen evolution reaction

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Journal of Energy Chemistry 2019年第12期28卷 61-67页

作者： Shengjue Deng Yanbin Shen Dong Xie Yangfan Lu Xiaolong Yu Liang Yang Xiuli Wang Xinhui Xia Jiangping Tu State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Provinceand School of Materials Science EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina Guangdong Engineering and Technology Research Center for Advanced Nanomaterials School of Environment and Civil EngineeringDongguan University of TechnologyDongguan 523808GuangdongChina State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikou 570228HainanChina

Metal sulphide electrocatalyst is considered as one of the most promising low-cost candidates for oxygen evolution reaction(OER).In this work,we report a novel free-standing Cu2S branch array via a facile TiO2-induced electrodeposition-sulfurization ***,cross-linked Cu2S nanoflake branch is strongly anchored on the TiO2 backbone forming high-quality Cu2S/TiO2/Cu2S core-branch *** branch formation mechanism is also *** compared to the pure Cu2S nanowire arrays,the asprepared Cu2S/TiO2/Cu2S core-branch arrays show much better alkaline OER performance with lower overpotential(284 mV at 10 mA cm^-2)and smaller Tafel slope(72 dec-1)as well as enhanced longterm durability mainly due to larger exposed area and more active electrocatalytic *** work provides a new way for construction of advanced metal sulphide electrocatalysts for electrochemical energy conversion.

关键词： copper sulphide Titanium oxide Core-branch arrays Water splitting Oxygen evolution reaction