At present, using desulfurization gypsum instead of natural gypsum as cement retarder has aroused the wide application of cement plant. Research in our country the desulfurization gypsum is used as cement retarder of the cement performance and mechanism of desulfurization gypsum. Studies have shown that the desulfurization gypsum containing a certain amount of sulfur trioxide, mixed with desulfurization gypsum, cement setting time is normal, the positive effect, mechanical properties and soundness of cement can be used instead of natural gypsum to cement production. In addition, studies the granulation and the use of desulfurization gypsum desulfurization gypsum to significant economic benefits of enterprises.

Desulfurization gypsum containing a certain amount of sulfur trioxide and more water soluble salt, mixed with desulfurization gypsum cement setting time is normal, mechanical properties and soundness of cement has a positive role. But desulfurization gypsum moisture content is in commonly 12-27%, good adhesion, therefore in the process of loading and unloading, hoisting, transportation extremely easy adhesion on the equipment, cause the product material, such as jam phenomenon. In the wet desulfurization gypsum granules into the ball, to reduce the mutual adhesion of materials, increase liquidity can completely change the desulfurization gypsum in cement production process problems.

Limestone powder in desulfurization gypsum reacts with sulfur dioxide industry by-products, is main composition of dihydrate calcium sulphate, is characterized by high purity, stable composition, particle size small, powder, water from about 12-17%, particle size uniform particle size distribution, particle size grading is poorer, the condensed water consumption is large, contain a certain amount of calcium carbonate and more water soluble salt, depending on the combustion of coal and gas dust removal effect, desulfurization gypsum from appearance to present different color, generally we common is yellowish gray or grayish white, good quality of desulfurization gypsum is a pure white color.

For desulfurization gypsum as cement retarder technical requirement is: the So3 content of sulphur trioxide () is more than 40%, the content is less than 7.4 mg/kg, attached water content below 5%, ignition loss less than 2%, conform to the requirements of desulfurization gypsum can be used as cement retarder, the setting time of cement can meet the standard requirements, the use of desulfurization gypsum in cement industry, the first: high purity, of dihydrate calcium sulphate content is adjustable, compared with natural gypsum less impurity, high quality; , the microstructure of desulfurization gypsum, make it less water, small hole is formed after evaporation and has the advantages on mechanics, and low chlorine ion and other corrosive impurities, which can improve the strength and durability.