Desulfurization gypsum, also known as smoke desulfurization gypsum, sulfur gypsum or FGD gypsum, the main component is the same as natural gypsum, calcium sulfate dihydrate CaSO4·2H2O, content ≥ 93%. Desulphurized gypsum is a by-product of the FGD process, a technology that uses lime-limestone to recover sulfur dioxide from flue gases from coal or oil. The technology is to grind lime-limestone into a slurry, so that the SO2-containing flue gas after dust removal passes through the slurry scrubber to remove SO2. Lime slurry reacts with SO2 to generate calcium sulfate and calcium sulfite, calcium sulfite is oxidized into calcium sulfate, and industrial by-product gypsum, called desulfurization gypsum, is widely used in building materials and other industries. Its processing and utilization is of great significance. It not only effectively promotes the further development of the national environmental protection circular economy, but also greatly reduces the mining amount of ore gypsum and protects resources.