With the increase in steel production and refining cycle accelerated active lime powder can sell, the yield and quality of steel smelting slag lime with increasingly stringent requirements of active lime powder sales, particularly for the development of more active lime to more attention. Lime to neutralize the activity of quicklime generated when the number of milliliters of digestive Ca (OH) 2 consumed 4mol / L hydrochloric acid, he said. Metallurgical lime as steelmaking "slagging agent", its importance has gradually get people's attention and cognition. It not only affects the steel smelting process, but also directly affect the final quality of the molten steel. The international community has been widely used good quality, fast response, slagging thorough quality "lime" instead of past use of the "ordinary lime" for the smelting of high-quality steel foundation.