“…The concentration of lithium, calcium, and strontium can reach 640.25 mg/L, 6.51 g/L, and 5.36 g/L, respectively, which exceeds the concentration of the separate exploiting production grade. , The oilfield brine is also famous for the extraordinary high concentrations of sodium, potassium, ammonium, calcium, and boron . The phase equilibria and phase diagrams can reveal the interaction between the brine and salt minerals and give guidance to the processes in brine including evaporation, concentration, crystallization, and phase transformation . Therefore, it is of great significance to engage the phase equilibria research for utilizing the valuable resources of the oilfield brine.…”