Lime: lime product is an after calcination obtained. It is through the actual characteristics of the calcined general performance: it is a granular, has a certain size and metallurgical lime quote, surface cleaning, high-quality metallurgical lime, loose texture, color white, metallurgical activity of lime, light weight, green heart small, containing less heat, metallurgical lime factory, has cooled fast, strong reaction with water, there is almost explosive reaction of light (soft) burnt lime. Effect of limestone (absorbent) reactivity of FGD system performance: some dissolved in the liquid phase chemical reaction rate will also affect limestone powder. The most important of these substances are soluble sulfite, Mg2 +, AlFx complexes and Cl-, a higher concentration of Cl- will reduce the reaction rate of limestone powder.