[ASAP] Solubility Phase Diagram of the Ternary System LiCl–MgCl2–H2O and Li2SO4–MgSO4–H2O at 348.15 K

4 years ago

[ASAP] Solubility Phase Diagram of the Ternary System LiCl–MgCl₂–H₂O and Li₂SO₄–MgSO₄–H₂O at 348.15 K

[ASAP] Solubility Phase Diagram of the Ternary System LiCl–MgCl<sub>2</sub>–H<sub>2</sub>O and Li<sub>2</sub>SO<sub>4</sub>–MgSO<sub>4</sub>–H<sub>2</sub>O at 348.15 K

Hongxia Li, Lijiang Guo, Fayan Zhu

The solubility isotherms of the ternary systems LiCl–MgCl₂–H₂O and Li₂SO₄–MgSO₄–H₂O were elaborately redetermined at 348.15 K using an isothermal equilibrium method. The compositions of solid phases were confirmed using the Scherinemakers' wet residue method. The ternary system LiCl–MgCl₂–H₂O is of a complex type with double salt LiCl·MgCl₂·7H₂O_(s) formed at 348.15 K, it gives the data of two invariant points for the first time and points out the boundary of three univariant curves and three crystallization fields corresponding to LiCl·H₂O_(s), MgCl₂·6H₂O_(s), and LiCl·MgCl₂·7H₂O_(s) clearly, which is more complete and accurate than the results in the literature at 348.15 K. In the ternary system Li₂SO₄–MgSO₄–H₂O, there are three solubility branches corresponding to the solid phases MgSO₄·nH₂O_(s) (n = 6 and 1) and Li₂SO₄·H₂O_(s); the phase field of MgSO₄·H₂O_(s) overlaps with the phase field of MgSO₄·6H₂O_(s), this finding indicates that the phase MgSO₄·H₂O_(s) is stable and MgSO₄·6H₂O_(s) is metastable; moreover, it gives the true equilibrium solubility data for MgSO₄·H₂O_(s) in the binary system MgSO₄–H₂O and the ternary system Li₂SO₄–MgSO₄–H₂O at 348.15 K and an invariant point which can point out the boundary of the two phase fields of MgSO₄·H₂O_(s) and Li₂SO₄·H₂O_(s) definitely. This article has not yet been cited by other publications.

Publisher URL: http://feedproxy.google.com/~r/acs/jceaax/~3/aoVojw9JGzE/acs.jced.0c00807

DOI: 10.1021/acs.jced.0c00807