...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Crystal Growth >Crystallization kinetics of Li_2CO_3 from LiHCO_3 solutions
【24h】

Crystallization kinetics of Li_2CO_3 from LiHCO_3 solutions

机译：LiHCO_3溶液中Li_2CO_3的结晶动力学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The crystallization kinetics of Li_2CO_3 from LiHCO_3 solutions was studied by a non-evaporation volume-constant batch reactor. The factors influencing the crystallization process such as initial concentration, temperature and stirring speed were investigated and discussed. In the experiment, CO_2 was stripped from a slightly acidic solution of LiHCO_3 by stirring resulting in critical supersaturation and precipitation of Li_2CO_3. The reduction of the Li~+ concentration was recorded as a function of time by determination with flame atomic absorption spectrometry (FAAS), and the pH values were also measured.rnThe results showed that the crystallization rate increased and the induction period shortened with increase in the initial concentration and temperature. In addition, high stirring speed could significantly promote this process.rnThermodynamic parameters at critical conditions such as the surface free energy and critical radius of nucleus were estimated based on the crystallization theory and experimental results. The results showed that the crystallization kinetics of this process coincided with the second-order reaction rate equation, and the apparent activation energy of the process was obtained. The analysis of the crystal growth mechanism showed that the growth of Li_2CO_3 from LiHCO_3 solutions was mainly controlled by diffusion.
机译：通过非蒸发体积恒定的间歇式反应器研究了LiHCO_3溶液中Li_2CO_3的结晶动力学。研究和讨论了影响结晶过程的因素，如初始浓度，温度和搅拌速度。在实验中，通过搅拌从LiHCO_3的弱酸性溶液中汽提了CO_2，导致了Li_2CO_3的临界过饱和和沉淀。通过火焰原子吸收光谱法（FAAS）测定，记录了Li〜+浓度的降低随时间的变化，并测量了pH值。结果表明，随着Na +的增加，结晶速率增加，诱导时间缩短。初始浓度和温度。此外，高搅拌速度可以显着促进这一过程。根据结晶理论和实验结果，估算了临界条件下的热力学参数，如表面自由能和核的临界半径。结果表明，该过程的结晶动力学符合二阶​​反应速率方程，并获得了表观活化能。晶体生长机理的分析表明，LiHCO_3溶液中Li_2CO_3的生长主要受扩散控制。

著录项

  • 来源
    《Journal of Crystal Growth》 |2010年第17期|P.2345-2350|共6页
  • 作者

    Wen-tao Yi; Chun-yan Yan; Pei-hua Ma;

  • 作者单位

    Department of Chemistry and Chemical Engineering, Zaozhuang University, Zaozhuang 277160, China;

    rnDepartment of Chemistry and Chemical Engineering, Zaozhuang University, Zaozhuang 277160, China;

    rnQinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A1. Diffusion; A1. Nucleation; A2. Growth from solution; B1. Lithium compound;

    机译：A1。扩散;A1。成核;A2。从解决方案中成长;B1。锂化合物;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号