Abstract:Phosphogypsum is a by - product of the wet - process phosphoric acid production. Its annual increment is huge, and the current global stockpile exceeds 6 billion tons. The large - scale accumulation of phosphogypsum has caused a series of problems, such as occupying land, polluting soil and water, and it also leads to serious waste of resources. Phosphogypsum can replace natural gypsum to prepare cement retarder. However, impurities in phosphogypsum such as SiO2 and organic matter will reduce the performance of cement products, which severely restricts the resource utilization of phosphogypsum. Impurities in phosphogypsum can be removed through various methods such as water washing, calcination, and flotation. At present, the flotation process is commonly used to purify phosphogypsum.This paper mainly introduces the direct flotation method, reverse flotation method, combined direct - reverse flotation method, and other combined flotation methods in the resource utilization of phosphogypsum, and points out the advantages and disadvantages of various flotation methods. It also points out the problems existing in the phosphogypsum flotation process, such as the high cost of flotation reagents, the complex flotation process, and the difficulty in treating the wastewater after flotation. Finally, some rational suggestions are put forward for the comprehensive resource utilization of phosphogypsum.