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

doi:10.1016/j.cjche.2019.02.009

Abstract

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

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

Lang Li, Jinsong Sui, Wei Qin. Synthesis of high purity Li₂CO₃ and MgCO₃·3H₂O in a homogeneous-like organic phase[J]. Chinese Journal of Chemical Engineering, 2019, 27(5): 1230-1234.

Lang Li, Jinsong Sui, Wei Qin. Synthesis of high purity Li₂CO₃ and MgCO₃·3H₂O in a homogeneous-like organic phase[J]. 中国化学工程学报, 2019, 27(5): 1230-1234.

References

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

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

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