Limestone particle size (fineness) on the FGD system performance: ground limestone powder can increase the surface area per unit mass of limestone powder, while maintaining the same pH and the same absorption tower desulfurization rate, calcium oxide, FGD system higher utilization of limestone running conditions, calcium oxide production, quality will be better by-product gypsum. Composition and general characteristics of limestone: Limestone is one of the most widely distributed minerals in the earth's crust. According to the different components contained in the ore, limestone can be divided siliceous limestone, clay, limestone and dolomitic limestone three. Chinese limestone rich in mineral resources, as cement, solvents and chemicals for industrial use has reached eight hundred at the limestone deposit. Origin throughout the provinces, municipalities and autonomous regions can be found in the vicinity of the industrial area of ??local materials.