Abstract: Phosphogypsum have has become the important factor that restricts the sustainable development of phosphorous chemical industry. Removal impurity and whitening of phosphogypsum is the only way to realize its large-scale utilization in building materials and fillers. In this paper, the phosphogypsum after flotation was treated by bleaching and calcination. Under the conditions of leaching temperature of 90 ℃, liquid-solid ratio of 4:1, Ca(ClO)₂ dosage of 3.0% and leaching time of 3.0 h, the whiteness of bleached phosphogypsum increased from 51.5% to 74.5%. Furthermore, the whiteness of the whitened phosphogypsum significantly reached 86.1% after calcining at 600 ℃ for 120 min, which met the requirements of gypsum plaster and PVC filler. The main component of phosphogypsum after calcination was CaSO₄, which was an irregular sheet structure with smooth surface and different sizes. This study has an important guiding significance for the large-scale comprehensive utilization of phosphogypsum.