Impurity category:
Insoluble impurities: such as timely, undecomposed apatite, insoluble P2O5, crystalline P2O5, fluoride and phosphates and sulfates of fluorine, aluminum and magnesium.
Soluble impurities: such as water-soluble P2O5, fluoride and sulfate with low solubility.
In addition, phosphogypsum also contains arsenic, copper, zinc, iron, manganese, lead, cadmium, mercury and radioactive elements. They are extremely trace, and most of them are insoluble solids, and their harm can be ignored. Impurities such as fluoride, free phosphoric acid, P2O5 and phosphate contained in phosphogypsum are the main factors that cause environmental pollution during storage. A large amount of phosphogypsum not only encroaches on land resources, but also pollutes the atmosphere, water system and soil due to wind erosion and rain erosion. Long-term exposure to phosphogypsum may lead to death or pathological changes.