Chemical Research in Chinese Universities ›› 2009, Vol. 25 ›› Issue (5): 740-743.

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Solid-liquid Metastable Equilibria in Quaternary System Li2SO4+Li2CO3+Li2B4O7+H2O at 288 K

SANG Shi-hua*, ZHANG Zhen-lei and LI Ming   

  1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, P. R. China
  • Received:2008-09-01 Revised:2008-11-17 Online:2009-09-25 Published:2009-12-07
  • Contact: SANG Shi-hua. E-mail: sangsh@cdut.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.40303010), the Young Science Foundation of Sichuan Province in China(No.08ZQ026-017) and the New Century Excellent Talents in University of China(No.NCET-07-0125).

Abstract:

Metastable equilibrium solubilities and densities of quaternary system Li2SO4+Li2CO3+Li2B4O7+H2O at 288 K were determined by isothermal evaporation method. According to the experimental data, the metastable equilibrium phase diagram was plotted. The metastable phase diagram had one invariant point F, three double saturated liquid curves E1F, E2F and E3F, and three crystallization fields corresponding to Li2SO4·H2O, Li2CO3 and  LiBO2·8H2O. It was found that lithium sulphate(Li2SO4) had the highest concentration and strong salting-out effects on the other salts. There were no solid solutions or double salts formed in the quaternary system at 288 K.

Key words: Metastable equilibrium; Lithium; Quaternary system