A study of Mangesium Oxysulphates

Abstract

The reactions which take place in the system MgO-MgSO₄-H₂O at concentrations of MgSO₄ solutions up to saturation and temperatures from 30 to 120 °C have been studied in detail. Four oxysulphates have been found, namely, 5Mg(OH)₂.MgSO₄. 3 or 2H₂O, 3Mg(OH)₂.MgSO₄.8H₂O, Mg(OH)₂. MgSO₄.5H₂O, and Mg(OH)₂.2MgSO₄.3H₂O, and an equilibrium diagram has been prepared which gives the conditions at which each is stable. X-Ray diffraction powder patterns of each of the oxysulphates are given and the stabilities of the compounds are briefly discussed.