Phase system K₂SO₄MgSO₄CaSO₄H₂O at temperatures above 373 K

Abstract

Studies on the phase relationships in the system K2SO4MgSO4CaSO4H2O were carried out at 423, 473 and 523 K. On the basis of experimental results, literature data on the solubilities of simple salts and the possibilities of paragenesis of salts known to occur in this system, 3 — dimensional phase diagrams were constructed for the three temperatures. The data obtained were utilized in developing a possible method of processing polyhalite — by causing its decomposition through the action of water at temperatures above 373 K.