Effect of limestone particle size (fineness) of the FGD system performance: the current multi-desulfurization absorber fineness PSD said that lime, which uses a mesh sieve screening limestone powder, used to represent the mass percent undersize limestone fineness of the powder. PSD limestone is an important design and operational parameters, limestone powder limestone powder PSD determines the specific surface area, affecting the utilization rate of the reaction pH and limestone towers, these variables can affect the removal efficiency greater extent. Lime: When BOF, purpose built with high alkalinity slag lime, lime powder processing plant, mainly to off molten sulfur and phosphorus. Because lime sulfur compound has characteristics lime sales, especially at high temperature state of lime, lime sulfur uptake capacity particularly strong. So, lime off the role of sulfur in steel is very large.