| Model of apparent crystal growth rate and kinetics of seeded precipitation from sodium aluminate solution |
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| 作者姓名： | 李小斌 刘志坚 徐晓辉 周秋生 彭志宏 刘桂华 |
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| 作者单位： | School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China |
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| 基金项目： | Project（50274076） supported by the National Natural Science Foundation of China |
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| 摘 要： | 1INTRODUCTION Seededprecipitationfromsupersaturatedsodi umaluminatesolutionisacrucialstepintheBayer processfortheproductionofaluminafromdigested bauxite,whichisphysico chemistryprocessinvol vingsecondarynucleation,agglomerationandcrys talgrowthetc14].Thecrystalgrowthisthees sentialapproachtothetransferofalumiumhy droxide(Al(OH)3)fromliquidtosolidphasedur ingseededprecipitation,whichvitallyaffectsthe precipitationratioandproductsize.Manyre searchersassumedthatthecrystalgrowthof Al(OH)3w…
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| 关 键 词： | 铝酸钠溶液 晶体生长速率 动力学 炼铝 |
| 文章编号： | 1005-9784（2005）06-0662-05 |
| 收稿时间： | 2005-03-28 |
| 修稿时间： | 2005-05-28 |
Model of apparent crystal growth rate and kinetics of seeded precipitation from sodium aluminate solution |
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| Li Xiao-bin , Liu Zhi-jian , Xu Xiao-hui , Zhou Qiu-sheng , Peng Zhi-hong and Liu Gui-hua.Model of apparent crystal growth rate and kinetics of seeded precipitation from sodium aluminate solution[J].Journal of Central South University of Technology,2005,12(6):662-666. |
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| Authors: | Li Xiao-bin Liu Zhi-jian Xu Xiao-hui Zhou Qiu-sheng Peng Zhi-hong and Liu Gui-hua |
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| Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, 410083 Changsha, China |
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| Abstract: | Based on the population balance equation in a batch crystallizer characteristic of seeded precipitation, a model to calculate the rate of apparent crystal growth of aluminum hydroxide from the size distribution was deve-loped. The simulation results indicate that the rate of apparent crystal growth during seeded precipitation exhibits a manifest dependence on the crystal size. In general, there is an obvious increase in the apparent crystal growth rate with the augment in crystal size. The apparent activation energy increases with the increase of characteristic crystal size, which indicates that the growth of small crystals is controlled by surface chemical reaction; it is gradually controlled by both the surface reaction and diffusion with the augment in crystal size. |
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| Keywords: | sodium aluminate solution seeded precipitation aluminum hydroxide apparent crystal growth rate kinetics |
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