Phase equilibria in the KCl-KBO2-K2CO3-K2WO4 quaternary system

The phase diagram of the KCl-KBO 2 -K 2 CO 3 -K 2 WO 4 quaternary system was studied by a calculation-experimental method and differential thermal analysis. Analytical models of phase equilibrium states were obtained, and the coordinates of a quaternary eutectic were determined: 545°C, 50 mol % KCl, 8 mol % KBO 2 , 22.5 mol % K 2 CO 3 , and 19.5 mol % K 2 WO 4 .