Modified ardealite with mildew-proof and antibacterial properties and preparation method of modified ardealite

The invention discloses modified phosphogypsum with mildew-proof and antibacterial properties and a preparation method thereof, and belongs to the field of phosphogypsum mildew-proof and antibacterial treatment. The modified ardealite with mildew-proof and antibacterial properties is prepared from the following raw materials in percentage by mass: 0.2 to 0.5 percent of water-soluble quaternary ammonium salt bacteriostatic agent, 14 to 24 percent of inorganic alkaline material, 46 to 56 percent of ardealite powder and 29.8 to 35.8 percent of water, wherein the water-soluble quaternary ammonium salt bacteriostatic agent is prepared from the following components in percentage by mass: 0.1 to 0.3 percent of benzalkonium chloride and 0.1 to 0.3 percent of hexadecyl trimethyl ammonium bromide; the inorganic alkaline material is prepared from the following components in percentage by mass: 5 to 20 percent of P.O 42.5 ordinary Portland cement and 3 to 9 percent of Ca (OH) 2; the dosage of quaternary ammonium salt bac