In this paper,hydrothermal phase reaction in MgSO4NaOHH2O quarternary reciprocal system at 160℃ has been studied.There appear four solid phases,corresponding to Mg(OH)2,5Mg(OH)2·MgSO4·2H2O,3Mg(OH)2·MgSO4·H2O and 2Mg(OH)2·MgSO4 respectively.The solid phases were determined by Chemical analysis,and characterized by both XRD and microphotograph.The MgSO4 concentration affects morphology of MOS(5Mg(OH)2·MgSO4·2H2O) whisker.
In this paper,the forming and transforming process of the magnesium oxysulfates in a quaternary interaction system of MgSO 4 -NaOH-H 2 O under the hydrothermal conditions at 180℃has been investigated by usin g MgSO 4 and NaOH solutions as starting materials.This transforming process of prod uct phase from unstable phase to stab le phase with time has been proved by means of c hemical analysis,microphotograph,XRD and IR.
