| Isothermal Kinetics of the Pentlandite Exsolution from mss/Pyrrhotite Using Model-Free Method |
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| 作者姓名： | WANG Haipeng |
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| 作者单位： | WANG Haipeng School of Chemical Engineering，University of Adelaide，Adelaide，SA 5005，Australia |
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| 基金项目： | SupportedbytheAustralianEducation,Science,andTrainingDe-partment(APAAward) |
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| 摘 要： | Introduction Pyrrhotite(Fe,Ni)1?xS and pentlandite(Fe,Ni)9S8areimportant constituents of primary nickel sulfide oredeposits.Pentlandite is invariably associated with pyr-rhotite.At high temperatures(above610℃)(Fe,Ni)1?xS has the NiAs structure and is kno…
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| 关 键 词： | 模型树方法 镍黄铁矿 一硫化物 磁黄铁矿 等温动力学 脱溶 |
| 收稿时间： | 2005-03-09 |
| 修稿时间： | 2005-03-092005-04-26 |
Isothermal Kinetics of the Pentlandite Exsolution from mss/Pyrrhotite Using Model-Free Method |
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| WANG Haipeng.Isothermal Kinetics of the Pentlandite Exsolution from mss/Pyrrhotite Using Model-Free Method[J].Tsinghua Science and Technology,2006,11(3):368-373. |
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| Authors: | WANG Haipeng |
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| Institution: | 1. Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands;2. Faculty of Earth and Life Sciences, VU University, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands;3. Department of Geosciences, Swedish Museum of Natural History, SE -10405 Stockholm, Sweden;1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China;3. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;1. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;2. The Open University of Japan, 2-11 Wakaba, Mihama-ku, Chiba 261-8586, Japan;3. Department of Earth Science & Astronomy, University of Tokyo, 3-8-9 Komaba, Meguro-ku, Tokyo 153-8902, Japan;4. Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan |
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| Abstract: | The pentlandite exsolution from monosulfide solid solution (mss)/pyrrhotite exsolution is a complex multi-step process, including nucleation, new phase growth and atomic diffusion, and lamellae coarsening. Some of these steps occur in sequence, others simultaneously. These make its kinetic analysis difficult, as the mechanisms cannot be elucidated in detail. In mineral reactions of this type, the true functional form of the reaction model is almost never known, and the Arrhenius parameters determined by the classic Avrami method are skewed to compensate for errors in the model. The model-free kinetics allows a universal determination of activation energy. Kinetic study of pentlandite exsolution from mss/pyrrhotite was performed over the temperature range 200 to 300°C. For mss/pyrrhotite with bulk composition (Fe0.77Ni0.19)S, activation energy of pentlandite exsolution, Ea, varies from 49.6 kJ · mol?1 at the beginning of reaction (nucleation is dominant) to 20.7 kJ · mol?1 at the end (crystal growth is dominant). In general, the activation energy varies during the course of solid reaction with the extent of reaction. The surrounding environment of reactant atoms affects the atom's activity and more or less accounts for changes of activation energy Ea. |
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| Keywords: | model-free kinetics pentlandite monosulfide solid solution (mss) pyrrhotite |
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