Desulfurized gypsum calcining process taking natural gas as heat source

The invention belongs to the technical field of processes for preparing gypsum by calcining, and particularly discloses a process for calcining desulfurized gypsum by taking natural gas as a heat source. The calcining process is carried out based on a desulfurized gypsum calcining device taking natural gas as a heat source, and by controlling the process conditions of all links of drying and calcining in the calcining device and the properties of original materials and all intermediate products, the quality of a desulfurized gypsum final product is finally ensured to be controlled to be that the standard thickness is less than 0.6, the crystal water content is 5.5-5.9%, and the quality of the desulfurized gypsum final product is improved. The quality of the gypsum powder influences whether the internal demand quantity of water is in a reasonable range or not when the finished gypsum mortar is applied, so that the abnormal conditions of plastic cracking, low strength and the like caused by over-limit quality c