development and evaluation of the magnesium potassium phosphate cement based refractory

In this work, the phosphate bonded refractory was developed using magnesium potassium phosphate cement. the cement was prepared from the caustic calcined magnesium oxide with the addition of mono potassium phosphate. the characterization of the cement was done by xrd and sem to examine the change in phase and morphology which occurs after the hydration of magnesium potassium phosphate cement which is in the struvite phase. to evaluate the physical, mechanical and thermal properties, refractory samples were casted and subsequently dried and fired at temperatures ranged from 1300 °c to 1500 °c. the effect of temperature on the bulk density, apparent porosity and crushing strength were analyzed. it was found that the properties of the chemically bonded refractory were better than the conventionally bonded calcium alumina cement refractory.