Method for preparing high-performance cementing material through negative-pressure anaerobic thermal cracking of phosphogypsum

The invention discloses a method for preparing a high-performance cementing material by negative-pressure anaerobic thermal cracking of ardealite, which comprises the following steps: adding water into ardealite, fully stirring to obtain slurry, placing the slurry in a nitrogen environment, and heating the slurry to 50-60 DEG C under the pressure of 0.04-0.06 MPa; the reaction container is rotated at the speed of 30-50 r/min, the temperature of the slurry is maintained at 200-300 DEG C, and the reaction is performed for 60-120 min; and drying and collecting the materials in the reaction container to obtain the gypsum-based cementing material. The material cracking and heating are uniform, the gypsum phase composition is simple, the removal effect on impurities in phosphogypsum is stable, free phosphoric acid and other impurities which have great influence on the performance are removed through over-cracking, and repeated tests prove that the prepared gypsum cementing material is simple in gypsum phase, good i