Desulfurization and resource utilization method of phosphorus fertilizer waste residues

The invention discloses a desulfurization and resource utilization method of phosphorus fertilizer waste residues. The method comprises the following steps: reducing granularity of the phosphorus fertilizer waste residues through pre-treatment; separating out impregnation fluid and filter cake through impregnation and filtration, wherein impregnation fluid contains the phosphorus pentoxide in thephosphorus fertilizer waste residues; heating and concentrating the impregnation fluid; drying and pulverizing the filter cake to make slurry and performing flue gas desulfurization; and performing post-treatment on the desulfurized product to separate magnesium sulfate solutions from calcium sulfate dihydrate precipitants, thus finally obtaining magnesium sulfate heptahydrate and calcium sulfatedihydrate to complete desulfurization and resource utilization of the phosphorus fertilizer waste residues. According to the desulfurization and resource utilization method of the phosphorus fertilizer waste residues disclosed