Within approximately 50 years, 1.0 × 108 tons of Phosphogypsum have already been produced and collected. Nearly 85 percent PG byproduct has been stored, only15 percent has been reprocessed. Lowering disposal of waste materials offers both environmental and economic advantages. Physical and chemical characteristics of Blast furnace slag cement after partial and full replacing of raw gypsum with samples prepared from BFSC-PG at various temperatures (200–1000°C) are formed by blending different proportions with PG have been studied. The results validated the application of calcined Phosphogypsum at 800 and 1000 degrees Celsius rather than raw gypsum in cement manufacturing.