Lime: With the variety and quality requirements for steel smelting technology and the continuous improvement of water with lime offer for lime products in the molten steel melting rate also have a "fast" requirements. The aim is to quickly increase slag formation speed, high alkalinity slag formed earlier. In this case, it appeared lime. Limestone particle size (fineness) on the FGD system performance: ground limestone powder can increase the surface area per unit mass of limestone water with lime powder manufacturers, while maintaining the same pH and the same absorption tower desulfurization rate, FGD system can run high limestone utilization conditions, the quality of the gypsum by-product will be better.