Abstract:In order to realize the comprehensive utilization of ferronickel slag(FS) and reduce the production cost of magnesium phosphate cement, ferronickel slag based magnesium phosphate cement(F MPC) was prepared through the reaction between ferronickel slag containing high magnesium composition and ammonium dihydrogen phosphate(ADP). The influences of the mass ratio of FS to ADP(mFS/mADP), magnesium oxide content(wM), water binder ratio(mW/mB), boric acid content(wBA) on the setting time and compressive strength of F MPC were discussed under the condition of constant temperature water bath reaction at 50℃ for 8 h. The phase composition and microstructures of hydration products of F MPC were analyzed by X ray diffraction(XRD) and scanning electron microscopy with energy dispersive X ray spectroscopy(SEM EDS), and the mechanism of hydration reaction in F MPC was discussed. The results show that when mFS/mADP=4, wM=4%, mW/mB=017, and wBA=03%, the working performance and mechanical property of F MPC are optimal; The hydration products of F MPC are mainly struvite, and there is also schertelite. F MPC materials use these hydration products as cementitious material, and the FS particles are wrapped by cementation to form a high strength hardened body.