(Liquid + solid) metastable equilibria in quinary system Li 2CO 3 + Na 2CO 3 + K 2CO 3 + Li 2B 4O 7 + Na 2B 4O 7 + K 2B 4O 7 + H 2O at T=288 K for Zhabuye salt lake

Abstract

An experimental study on metastable equilibria at T=288 K in the quinary system Li 2CO 3 + Na 2CO 3 + K 2CO 3 + Li 2B 4O 7 + Na 2B 4O 7 + K 2B 4O 7 + H 2O was done by isothermal evaporation method. Metastable equilibrium solubilities and densities of the solution were determined experimentally. According to the experimental data, the metastable equilibrium phase diagram under the condition saturated with Li 2CO 3 was plotted, in which there are four invariant points; nine univariant curves; six fields of crystallization: K 2CO 3 · 3/2H 2O, K 2B 4O 7 · 5H 2O, Li 2B 2O 4 · 16H 2O, Na 2B 2O 4 · 8H 2O, Na 2CO 3 · 10H 2O, NaKCO 3 · 6H 2O. Some differences were found between the stable phase diagram at T=298 K and the metastable one at T=288 K.