Welcome to visit The Chinese Journal of Process Engineering, Today is

›› 2009, Vol. 9 ›› Issue (4): 661-668.

• 反应与分离 • Previous Articles     Next Articles

Unseeded Induction Period and Primary 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,

Unseeded Induction Period and Primary 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
  • 通讯作者: 宋兴福

PDF

Abstract: A set of laser apparatus was used to study induction period and primary nucleation of lithium carbonate in reactive crystallization. The results show that induction period increases with the decrease of supersaturation degree and temperature. Magnetic field has nearly no impact on it, while the use of ultrasound reduces it obviously. The impacts of some impurities and additives on primary nucleation were investigated. It is found that the presence of Na2SO4, NH4Cl, (NH4)2SO4 and EDTA disodium prolongs induction period, whereas KCl, NaCl, NaBr and CH4N2O can decrease it. Many important parameters of primary nucleation are also obtained, as temperature goes up from 283 to 313 K, interfacial tension decreases from 44.8 to 41.5 mJ/m2, contact angle varies from 82.9o to 88.7o, nucleation order is between 5.0 and 5.4, surface entropy factors are all above 5, suggesting that the growth mechanism is a spiral growth. Besides, both the homogeneous and heterogeneous primary nucleations were monitored with on-line focused beam reflectance measurement.

Key words: lithium carbonate, primary nucleation, reactive crystallization, induction period, focused beam reflectance measurement

摘要： A set of laser apparatus was used to study induction period and primary nucleation of lithium carbonate in reactive crystallization. The results show that induction period increases with the decrease of supersaturation degree and temperature. Magnetic field has nearly no impact on it, while the use of ultrasound reduces it obviously. The impacts of some impurities and additives on primary nucleation were investigated. It is found that the presence of Na2SO4, NH4Cl, (NH4)2SO4 and EDTA disodium prolongs induction period, whereas KCl, NaCl, NaBr and CH4N2O can decrease it. Many important parameters of primary nucleation are also obtained, as temperature goes up from 283 to 313 K, interfacial tension decreases from 44.8 to 41.5 mJ/m2, contact angle varies from 82.9o to 88.7o, nucleation order is between 5.0 and 5.4, surface entropy factors are all above 5, suggesting that the growth mechanism is a spiral growth. Besides, both the homogeneous and heterogeneous primary nucleations were monitored with on-line focused beam reflectance measurement.

关键词: lithium carbonate, primary nucleation, reactive crystallization, induction period, focused beam reflectance measurement

CLC Number: