Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (6): 20230074.doi: 10.7503/cjcu20230074

• Physical Chemistry • Previous Articles     Next Articles

Determination of the Nucleation Kinetics of Lithium Carbonate by Induction Period Measurement

CHENG Wenting(), LI Qianqian, CHENG Huaigang, CHENG Fangqin()   

  1. Institute of Resources and Environmental Engineering,Shanxi University,Taiyuan 030031,China
  • Received:2023-02-20 Online:2023-06-10 Published:2023-04-14
  • Contact: CHENG Wenting, CHENG Fangqin E-mail:wtcheng@sxu.edu.cn;cfangqin@sxu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22208198);the National Key Research and Development Program of China(2022YFC3901305)

Abstract:

Nucleation kinetics was investigated by induction period measurement for supersaturated solutions of lithium carbonate(Li2CO3) in the LiCl-Na2CO3 system with and without NaCl over the temperature range of 288.15—323.15 K. The supersaturation of Li2CO3 was rigorously determined by full speciation model through OLI stream analyzer software. The effects of temperature, supersaturation and presence of NaCl on the nucleation induction period of Li2CO3 were studied experimentally. The nucleation kinetic parameters such as activation energy, interfacial tension and contact angle were calculated according to the classical theory of primary nucleation. The induction period was prolonged by adding NaCl in solutions at a constant supersaturation. The activation energy of Li2CO3 nucleation reaction increased from 63.69 kJ/mol(the excess of Cl ions Y=0) to 72.85 kJ/mol(the excess of Cl ions Y=0.5) after the addition of NaCl, indicating that the addition of NaCl inhibited the nucleation of Li2CO3. Classical theory of primary nucleation was used to study the homogeneous and heterogeneous nucleation mechanism of Li2CO3. The interfacial tension of homogeneous nucleation was higher than that of heterogeneous nucleation. Both interfacial tensions of homogeneous and heterogeneous nucleation had no significant dependence on temperature, and were not obviously influenced by the presence of NaCl.

Key words: Lithium carbonate, Nucleation, Kinetics, Induction period, Interfacial tension

CLC Number: 

TrendMD: