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›› 2009, Vol. 9 ›› Issue (4): 652-660.

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Seeded Induction Period and Secondary Nucleation of Lithium Carbonate

孙玉柱 宋兴福 汪瑾 罗妍 于建国   

  1. 华东理工大学化学工程国家重点实验室 华东理工大学资源与环境工程学院 华东理工大学盐湖工业技术研究中心 华东理工大学资源过程工程研究所 华东理工大学盐湖工业技术研究中心
  • 收稿日期:2009-03-09 修回日期:2009-05-08 出版日期:2009-08-20 发布日期:2009-08-20
  • 通讯作者: 宋兴福

Seeded Induction Period and Secondary Nucleation of Lithium Carbonate

SUN Yu-zhu, SONG Xing-fu, WANG Jin, LUO Yan, YU Jian-guo,   

  1. State key laboratory of Chemical Engineering, East China University of Science and Technology College of resource and environmental engineering , the East of China University of Science and Technology Engineering Laboratory of Salt Lake，East China University of Science and Technology State key laboratory of Chemical Engineering, East China University of Science and Technology Engineering Laboratory of Salt Lake，East China University of Science and Technology
  • Received:2009-03-09 Revised:2009-05-08 Online:2009-08-20 Published:2009-08-20
  • Contact: SONG Xing-fu,

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摘要： Seeded nucleation of lithium carbonate in aqueous solution during reactive crystallization was monitored by FBRM (focused beam reflectance measurement) and PVM (particle video microscope). The impacts of operating variables, such as seed size and loading, stirring speed, on induction period and secondary nucleation were investigated and explained by an adsorption model. The results show that seed surface area plays an important role in secondary nucleation, for more surface area has higher adsorption capacity and consumes more supersaturation on seed growth, thus restrains nucleation better. A method through comparison between pure breakage/attrition and nucleation process was put forward to distinguish attrition-induced and surface-induced nucleations quantitatively, which can reveal the contributions of different nucleation mechanisms. The nucleation processes in different conditions were studied, the principles and valuable experimental data were obtained for seeding approach primarily. FBRM and PVM are useful on-line apparatuses to facilitate seed selection and seeding optimization.

关键词: lithium carbonate, reactive crystallization, secondary nucleation, focused beam reflectance measurement, particle video microscope

Abstract: Seeded nucleation of lithium carbonate in aqueous solution during reactive crystallization was monitored by FBRM (focused beam reflectance measurement) and PVM (particle video microscope). The impacts of operating variables, such as seed size and loading, stirring speed, on induction period and secondary nucleation were investigated and explained by an adsorption model. The results show that seed surface area plays an important role in secondary nucleation, for more surface area has higher adsorption capacity and consumes more supersaturation on seed growth, thus restrains nucleation better. A method through comparison between pure breakage/attrition and nucleation process was put forward to distinguish attrition-induced and surface-induced nucleations quantitatively, which can reveal the contributions of different nucleation mechanisms. The nucleation processes in different conditions were studied, the principles and valuable experimental data were obtained for seeding approach primarily. FBRM and PVM are useful on-line apparatuses to facilitate seed selection and seeding optimization.

Key words: lithium carbonate, reactive crystallization, secondary nucleation, focused beam reflectance measurement, particle video microscope

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