Lime: theoretical concepts of active lime, is a chemical properties and lively, strong ability to participate in the reaction, containing S (sulfur), low P (phosphorus) and other harmful impurities. It has the following main characteristics: volume density, porosity, large surface area, the reaction performance. It also has: CaO crystal fine: ≤1 wm limestone superfine powder, high CaO content: ≥90% limestone ultrafine powder manufacturers, S, P content is low: <0.02% and traces of high-quality limestone superfine powder, SiO2 + Fe2O3 + Al2O3 content Low: <2% residual CO2 Low: ≤2% lighter and other characteristics of 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.