Effect of limestone particle size (fineness) of the FGD system performance: whether it is purchased directly limestone powder metallurgy limestone as the absorbent, or will arrive after limestone plant, with wet grinding mill to be absorbed by the tiny particles of limestone metallurgical limestone sales agent slurry, or dried and ground into a certain fineness limestone powder. These are related to the extent of Shanxi metallurgical limestone ground limestone, a parameter indicative of the fineness of particles having a particle size or particle size distribution. Lime deep processing: soda ash (Na2CO3) calcium chloride method. An aqueous solution of calcium chloride is added in soda ash, calcium carbonate precipitation can be generated. Alkaline: The production of caustic soda (NaOH) in Shandong metallurgy process limestone, precipitated calcium carbonate by-product can be obtained. Soda lime added to the aqueous solution to generate calcium carbonate precipitate, and also get the caustic soda solution, and finally precipitate calcium carbonate by dehydration, drying and grinding it to obtain PCC.