Method for detecting content of sulfur trioxide in ardealite

The detection method provided by the invention comprises the following steps: S1, pretreating phosphogypsum to be detected; s2, obtaining a standard detection curve of the content of sulfur trioxide in a series of standard ardealite; correcting and reconstructing the standard detection curve to obtain a comparison curve; s3, detecting the pretreated to-be-detected ardealite through a full-automatic system to obtain a to-be-detected product detection curve; and S4, comparing the detection curve of the product to be detected with the comparison curve, correcting, and calculating to obtain the content of sulfur trioxide. According to the detection method provided by the invention, firstly, the raw materials are pretreated, impurities, interfering sulfur trioxide detection, of the treated to-be-detected product are reduced as much as possible, the accuracy of a sulfur trioxide content curve is increased, and meanwhile, the detection accuracy is further ensured through secondary calibration of a standard curve. Th