SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (5): 1230-1234.DOI: 10.1016/j.cjche.2019.02.009

• Materials and Product Engineering • 上一篇    

Synthesis of high purity Li2CO3 and MgCO3·3H2O in a homogeneous-like organic phase

Lang Li, Jinsong Sui, Wei Qin   

  1. Department of Chemical Engineering, State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • 收稿日期:2018-06-21 修回日期:2019-01-08 出版日期:2019-05-28 发布日期:2019-06-27
  • 通讯作者: Lang Li
  • 基金资助:
    Supported by the National Natural Science Foundation of China (U1607118).

Synthesis of high purity Li2CO3 and MgCO3·3H2O in a homogeneous-like organic phase

Lang Li, Jinsong Sui, Wei Qin   

  1. Department of Chemical Engineering, State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2018-06-21 Revised:2019-01-08 Online:2019-05-28 Published:2019-06-27
  • Contact: Lang Li
  • Supported by:
    Supported by the National Natural Science Foundation of China (U1607118).

摘要: Herein, three kinds of Li2CO3 and two kinds of MgCO3·3H2O crystals are easily synthesized in a homogeneouslike organic phase. The morphology and size of synthesized crystals are controllable and adjustable in the single organic phase, with the morphology of Li2CO3 ranging from micro-flaky, flower to nanobranch, MgCO3·3H2O ranging from nanosphere to nanorod. Compared with coupled reaction and solvent extraction process, of which the crystallization process occurred in the interface of two phase, our proposed method made it possible that the crystallization process occurred in the single organic phase, which resulted in better crystal morphology. Moreover, the formation mechanism of different crystal morphologies is discussed, the results showed that the crystals in micron size and nano size are involved in two crystallization mechanism, the micron particles in the form of flake and flower-like is a typical radial growth, which means that the growth occurs by diffusion around a nucleus as starting point, while the reaction model for small particles should be similar to a water-in-oil structure. As the reaction carried out, the crystal should be restricted in a constrained organic structure.

关键词: Li2CO3, MgCO3· 3H2O, Morphology, Crystallization mechanism

Abstract: Herein, three kinds of Li2CO3 and two kinds of MgCO3·3H2O crystals are easily synthesized in a homogeneouslike organic phase. The morphology and size of synthesized crystals are controllable and adjustable in the single organic phase, with the morphology of Li2CO3 ranging from micro-flaky, flower to nanobranch, MgCO3·3H2O ranging from nanosphere to nanorod. Compared with coupled reaction and solvent extraction process, of which the crystallization process occurred in the interface of two phase, our proposed method made it possible that the crystallization process occurred in the single organic phase, which resulted in better crystal morphology. Moreover, the formation mechanism of different crystal morphologies is discussed, the results showed that the crystals in micron size and nano size are involved in two crystallization mechanism, the micron particles in the form of flake and flower-like is a typical radial growth, which means that the growth occurs by diffusion around a nucleus as starting point, while the reaction model for small particles should be similar to a water-in-oil structure. As the reaction carried out, the crystal should be restricted in a constrained organic structure.

Key words: Li2CO3, MgCO3· 3H2O, Morphology, Crystallization mechanism