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Metastable equilibrium solubilities and densities of the Li_2SO_4+K_2SO_4+Li_2CO_3+K_2CO_3+H_2O system at 288 K were determined experimentally by using the isothermal evaporation method. According to the experimental data, the metastable equilibrium solubility phase diagram was constructed. In the phase diagram, there are three invariant points, seven univariant curves, and five fields of crystallization: Li2SO4·H2O, K2SO4, Li2CO3, K2CO3·3/2H2O and K2SO4·Li2SO4. The double salt K2SO4·Li2SO4 was found in the metastable equilibria. Lithium carbonate(Li2CO3) has the smallest solubility in the quaternary system.
Metastable equilibrium solubilities and densities of the Li_2SO_4 + K_2SO_4 + Li_2CO_3 + K_2CO_3 + H_2O system at 288 K were determined experimentally by using the isothermal evaporation method. According to the experimental data, the metastable equilibrium solubility phase diagram was constructed. In the phase diagram, there are three invariant points, seven univariant curves, and five fields of crystallization: Li2SO4 · H2O, K2SO4, Li2CO3, K2CO3 · 3 / 2H2O and K2SO4 · Li2SO4. The double salt K2SO4 · Li2SO4 was found in the metastable equilibria. Li2CO3) has the smallest solubility in the quaternary system.