Determination Method of Lime Activity

Lime activity is an indicator of the hydration reaction rate of quicklime, that is, it is expressed in milliliters of 4mol/L hydrochloric acid consumed to neutralize the Ca(OH)2 produced during the digestion of quicklime within a sufficient time. The activity of lime depends on its organizational structure, and the organizational structure of lime is closely related to calcination temperature and calcination time. The organizational structure that affects the activity of lime includes bulk density, porosity, specific surface area and grain size of CaO minerals.

The smaller the grain size, the larger the surface area, the higher the porosity, the higher the lime activity, and the stronger the chemical reaction ability. At present, the average value of lime activity can generally exceed 300 ml/4N-HCl, which can significantly shorten the initial slagging time of the steelmaking converter, reduce the consumption of lime per ton of steel, and is extremely beneficial to the early removal of P. The activity of lime refers to its ability to react with other substances in the slag. Expressed by the melting rate of lime in slag. It is usually expressed by the reaction rate of lime and water. Specifically, it can be said that within 10 minutes under standard atmospheric pressure, the number of milliliters of 4N HCl aqueous solution consumed by 50 grams of lime dissolved in 40 degrees Celsius constant temperature water is defined as the activity of lime.