Method for expressing the activity of quicklime
The activity degree of quicklime is a key indicator for measuring its quality and reactivity, which reflects the speed and intensity of the reaction between quicklime and water. The following methods are commonly used to represent it.
Hydrochloric acid titration method: This is a common and accurate method. Place a certain quality and particle size of quicklime sample in a specific container, add a specified volume of water, and allow it to fully react. After the reaction is complete, titrate the remaining alkaline solution with a known concentration of hydrochloric acid standard solution, and calculate the activity based on the amount of hydrochloric acid consumed. The higher the activity, the more hydrochloric acid is consumed, indicating that the more calcium hydroxide is generated by the reaction between quicklime and water, and the stronger the reaction activity.
Temperature time curve method: characterizes the activity by recording the temperature changes over time during the reaction between quicklime and water. In the initial stage of the reaction, highly active quicklime reacts violently with water, releasing a large amount of heat, causing the temperature to rise rapidly and reach a high peak, and then the temperature drops rapidly. Draw a curve based on the rate of temperature rise, peak value, and decrease, and the characteristics of the curve can intuitively reflect the degree of activity.
Accurately representing the activity of quicklime is of great significance for controlling product quality, optimizing reaction conditions, and evaluating the application effects of quicklime in various fields during production.
