Large-Scale Plant for the Crystallization of Potassium Chloride (MOP) and Sodium Chloride from Brine

In the first step, brine is extracted through cavern mining and mixed salt is produced in three parallel three-effect evaporation crystallization plants by evaporating water and exceeding the solubility of some of the salts. Subsequently, the salts, mainly NaCl and KCl, are separated and partially re-dissolved by creating a hot solution, resulting in high-purity table salt.

The solution produced in the described plants is then concentrated in another two-effect evaporation crystallization plant, where another mixed salt, mainly carnallite and NaCl, is produced. This is then returned to the three-effect plants for transformation.

The hot solution is then cooled in a seven-effect vacuum cooling crystallization process. This works according to the typical principle of KCl production. As the solubility of KCl decreases with falling temperature, progressive crystallization of salt occurs with progressive temperature reduction. This salt is then sent to the final stage for salt separation and drying.