| 草酸钴沉淀过程的溶液体系演变模拟 |
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| 引用本文： | 何显达,叶红齐,许开华,陈永明,邓伟,周继锋,蒯勤,M.HOUNSLOW. 草酸钴沉淀过程的溶液体系演变模拟[J]. 中国有色金属学报, 2011, 0(9) |
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| 作者姓名： | 何显达 叶红齐 许开华 陈永明 邓伟 周继锋 蒯勤 M.HOUNSLOW |
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| 作者单位： | 中南大学化学化工学院;深圳市格林美高新技术股份有限公司;Department of Chemical and Process Engineering;University of Sheffield;中南大学冶金科学与工程学院; |
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| 摘 要： | 通过pH值在线检测和Co浓度离线分析方法,结合热力学数据建立的平衡模型,对草酸钴沉淀过程的溶液体系进行动态模拟。结果表明,随着沉淀反应的进行,体系pH值和过饱和度不断下降,沉淀率则逐渐升高,沉淀过程依次经历诱导期、成核期和生长期。在较高的反应物浓度下,沉淀反应速度更快,体系pH值和过饱和度下降速度随之增大,而沉淀率也有所增加。SEM和激光粒度分析结果表明,较高的反应物浓度下所得草酸钴粉体的一次晶粒粒径较小,易于团聚形成尺寸较大的刺球状团聚体。通过引入Davies活度系数,pH值在线分析模型和Co浓度离线分析模型吻合度高,模拟结果重现性好。
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| 关 键 词： | 草酸钴 沉淀 粉体 过饱和度 热力学 |
Simulation on evolution of solution system in precipitation of cobalt oxalate |
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| HE Xian-da,,,YE Hong-qi,XU Kai-hua,CHEN Yong-ming,DENG Wei,ZHOU Ji-feng,KUAI Qin,M.HOUNSLOW. Simulation on evolution of solution system in precipitation of cobalt oxalate[J]. The Chinese Journal of Nonferrous Metals, 2011, 0(9) |
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| Authors: | HE Xian-da YE Hong-qi XU Kai-hua CHEN Yong-ming DENG Wei ZHOU Ji-feng KUAI Qin M.HOUNSLOW |
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| Affiliation: | HE Xian-da1,2,4,YE Hong-qi1,XU Kai-hua2,CHEN Yong-ming3,DENG Wei2,ZHOU Ji-feng2,KUAI Qin2,M.HOUNSLOW4 (1.College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China,2.Shenzhen GEM High-Tech Co.,Ltd.,Shenzhen 518116,3.School of Metallurgical Science and Engineering,4.Department of Chemical and Process Engineering,University of Sheffield,Mappin Street S1 3JD,UK) |
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| Abstract: | Based on online pH value testing and offline Co concentration analysis,a thermodynamic equilibrium model was established for dynamic simulation on precipitation of cobalt oxalate.The obtained results indicate that the precipitation process undergoes induction,nucleation and growth period successively along with decreased pH value and supersaturation,and increases the precipitation ratio.At higher reactant concentration the pH value and supersaturation fall down rapidly as a result of the faster reaction rat... |
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| Keywords: | cobalt oxalate precipitation powder supersaturation thermodynamic |
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