What is the activity level of lime calcined in a vertical lime kiln
Lime vertical kiln is an important equipment for lime production, and the activity of the lime calcined is one of the key indicators for measuring the quality of lime. Activity level, usually expressed in milliliters of hydrochloric acid consumed per unit time for lime to react with 4N HCl (4 moles per liter of hydrochloric acid), reflects the ability of lime to react with acid, that is, the level of its reaction activity.
In the calcination process of lime vertical kiln, multiple factors jointly affect the activity of lime. Firstly, the quality of raw materials for limestone is the foundation, and high-quality limestone can be calcined to produce lime with higher activity. Secondly, the calcination temperature and time have a direct impact on the activity level. Excessive temperature or prolonged time can cause lime to overheat, thereby reducing its activity. On the contrary, insufficient temperature or short time may lead to under burning of lime, which also affects the improvement of activity.
In actual production, lime vertical kilns can obtain lime with an activity level in the range of 280-330ml/4N HCl by precisely controlling the calcination conditions. Lime within this range of activity can meet the basic needs of industrial fields such as steelmaking and cement, while also ensuring production efficiency and product quality to a certain extent.
It is worth noting that the higher the activity of lime, the better. Excessive activity may indicate the presence of too much free calcium oxide in lime, which can lead to issues such as volume expansion and decreased strength during use. Therefore, in practical applications, it is necessary to choose the appropriate lime activity level according to specific needs.
The activity of lime calcined in a vertical kiln is influenced by various factors. By precisely controlling the calcination conditions, lime products with moderate activity and stable quality can be obtained. Lime within this range of activity can meet industrial production needs while ensuring product stability and reliability.
