The study on the effect of phosphogypsum on the performance of sulfur-magnesium cement
LIN Tiancheng
XU Xun
SUN Yongtao
ZHU Bei
Abstract：Through single addition of phosphogypsum and orthogonal experiments,the mechanical and water resistance proper-ties of magnesium sulfide oxide cement(MOS)were analyzed,and the mechanism of phosphogypsum and phosphoric acid on MOS was further analyzed by XRD and SEM.The results demonstrate that the judicious incorporation of phosphogypsum can effectively enhance the flexural strength and water resistance of MOS.Specifically,a phosphogypsum content of 25％enables the softening co-efficients of MOS to reach 0.91 at 14 days and 0.81 at 28 days.The optimal combination of factors was found to be a phospho-gypsum content of 30％,a phosphoric acid content of 0.9％,and a water-sulfur ratio of 18,which resulted in flexural and compres-sive strengths of 10.9 MPa and 50.9 MPa at 28 days,respectively,and softening coefficients of 1.08 and 0.63 at 14 and 28 days,re-spectively.
Keywords：phosphogypsummagnesium sulfide oxide cementmechanical propertieswater resistance
Publication Date：2025-04-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 103-108 )