Modelling the kinetics of calcium hydroxide dissolution in water

In water treatment calcium hydroxide is used in softening and decarbonizati on techniques as well as in stabilization processes. Due to its slight solu bility calcium hydroxide is applied as suspension. The dissolution kinetics plays a major role in these processes. For the characterization of calcium hydroxide dissolution empirical methods exist. These methods allow relativ e comparison of different calcium hydroxide products. Thus in this study a dissolution rate model is presented that is based on the chemical reactions determining the dissolution. This model allows to predict the dissolution with respect to particle diameter and temperature. However, the most import ant factor is the particle diameter i.e. the total surface of particles in solution. Furthermore an effect of the dosed amount of calcium hydroxide pa rticles on the solubility was found.