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Fe_(3)O_(4)对黄铜矿在酸性硫酸铁溶液中铜溶解氧化还原反应的影响

Transactions of Nonferrous Metals Society of China 2024年第6期34卷 1965-1975页

作者： Kolela J NYEMBWE Elvis FOSSO-KANKEU Frans WAANDERS martin mkandawire Didier K NYEMBWE Bhekie B MAMBA Water Pollution Monitoring and Remediation Initiatives Research Group School of Chemical and Minerals EngineeringFaculty of EngineeringNorth-West UniversityPotchefstroomSouth Africa Department of Mining Engineering College of Science Engineering and TechnologyUniversity of South AfricaFlorida Science CampusJohannesburgSouth Africa Department of Metallurgy Faculty of Engineering and Built EnvironmentUniversity of JohannesburgDoornfonteinJohannesburgSouth Africa Department of Chemistry School of Science and TechnologyCape Breton UniversityCanada School of Mining Metallurgy and Chemical EngineeringFaculty of Engineering and the Built EnvironmentUniversity of JohannesburgJohannesburgSouth Africa Institute for Nanotechnology and Water Sustainability College of Science Engineering and TechnologyUniversity of South AfricaFlorida Science CampusJohannesburgSouth Africa

由于钝化层的形成,黄铜矿(CuFeS_(2))在氧化条件下浸出通常具有溶解速率缓慢的特点。为了将黄铜矿浸出过程中的钝化效应降至最低并提高铜的回收率,研究了CuFeS_(2)在不同pH值(1.0、1.5和1.8)和温度(25和50℃)条件下浸出时,向Fe_(2)(SO_(... 详细信息

由于钝化层的形成,黄铜矿(CuFeS_(2))在氧化条件下浸出通常具有溶解速率缓慢的特点。为了将黄铜矿浸出过程中的钝化效应降至最低并提高铜的回收率,研究了CuFeS_(2)在不同pH值(1.0、1.5和1.8)和温度(25和50℃)条件下浸出时,向Fe_(2)(SO_(4))_(3)−H_(2)SO_(4)浸出剂中添加磁铁矿(Fe_(3)O_(4))对铜溶解速率的影响。结果表明,溶液pH值、电位和温度在溶解过程中起着关键作用。在pH 1.8、50℃和400 mV的条件下,Fe_(3)O_(4)−CuFeS_(2)混合体系中铜的回收率达到最大值(70%),而未添加Fe_(3)O_(4)时,CuFeS_(2)中铜的回收率较低(48%)。添加Fe_(3)O_(4)有助于维持较高的氧化还原值。添加Fe_(3)O_(4)还使活化能从79.04 kJ/mol降低到53.69 kJ/mol。这表明,当Fe_(3)O_(4)存在时,由于形成了更易溶解的中间体斑铜矿(Cu_(5)FeS_(4))和辉铜矿(Cu_(2)S),CuFeS_(2)更易被氧化。两种溶解过程都受到矿物表面的化学控制。此外,对浸出残渣的矿物学分析表明,当无Fe_(3)O_(4)存在时,作为表面钝化物的黄钾铁矾浓度较高。因此,添加Fe_(3)O_(4)减少了钝化层的形成,提升了铜的回收率。

关键词：黄铜矿溶解磁铁矿电偶钝化

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pH-dependent leaching mechanism of carbonatitic chalcopyrite in ferric sulfate solution

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Transactions of Nonferrous Metals Society of China 2021年第7期31卷 2139-2152页

作者： Kolela J NYEMBWE Elvis FOSSO-KANKEU Frans WAANDERS martin mkandawire Water Pollution Monitoring and Remediation Initiatives Research Group School of Chemical and Minerals EngineeringFaculty of EngineeringNorth-West UniversitySouth Africa Department of Chemistry School of Science and TechnologyCape Breton UniversityCanada

The dissolution of a carbonatitic chalcopyrite(CuFeS2)was studied in H_(2)SO_(4)−Fe_(2)(SO_(4))_(3)−FeSO_(4)−H_(2)O at varying pH values(0.5−2.5)and 25℃ for 12 *** were conducted with a size fraction of 53−75μ*** Cu recoveries,below 15%,were observed in all pH *** results from the XRD,SEM−EDS,and optical microscopic(OM)analyses of the residues indicated that the dissolution proceeded through the formation of transient ***_(3.39)Fe_(0.61)S_(4) and Cu_(2)S were the intermediate phases at pH 0.5 and 1.0,respectively,whereas Cu_(5)FeS_(4) was the major mineral at pH 1.5 and *** thermodynamic modelling predicted the sequential formation of CuFeS_(2)→Cu_(5)FeS_(4)→Cu_(2)S→*** soluble intermediates were Cu_(5)FeS_(4) and Cu2S,whilst,CuS and Cu_(3.39)Fe_(0.61)S_(4) were the refractory phases,supporting their cumulating behaviour throughout the *** obtained results suggest that the formation of CuS and Cu_(3.39)Fe_(0.61)S_(4) could contribute to the passive film formed during CuFeS_(2) leaching.

关键词： chalcopyrite carbonatite chemical leaching leaching mechanism intermediate phase thermodynamic behavior

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Dyes in Carbon Nanotube Arrays

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材料科学与工程（中英文B版） 2012年第6期2卷 334-346页

作者： Gerhard Lackner Tobias Mayer-Uhma Ingolf Endler Richard Boucher Frank Meissner Sebastian Scholz Mario Krug Viktor Bezugly martin mkandawire Anindya Majumder Daria A. Kovalenko Susan Conze Stefanie Hildebrandt Alexander Michaelis Doru C. Lupascu Institute for Materials Science University Duisburg-Essen Essen 45141 Germany Fraunhofer Institute for Ceramic Technologies and Systems Dresden 01277 Germany Institute for Materials Science Dresden University of Technology Dresden 01069 Germany Fraunhofer Institute for Non-Destructive Testing Dresden Branch Dresden 01109 Germany

The infiltration of dissolved dies into vertically aligned carbon nanotube arrays (VA-CNT) is reported. The ultra hydrophobic surface of a CNT array can be completely infiltrated on a surface area of 48 mm2 by an appropriate choice of solvent. This is so far not possible by evaporation techniques. Depending on the solvent type, the CNT alignment remains unaltered, which is strongly modified, or even lost. The infiltrated CNT array provides a well ordered electrode structure for organic solar cells. The CNT can simultaneously serve as electron acceptor in combination with an appropriate donor dye. Sensors and organic LED are among further applications.

关键词：碳纳米管阵列染料有机太阳能电池有机发光二极管疏水表面 CNT 垂直排列蒸发技术

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