Method and Apparatus for Treatment of a Potassium Chloride Mixture

A potassium chloride mixture having particles of different size is, in a first step, leached with an unsaturated solution at elevated temperature, with the very fine components being completely dissolved and the coarse components being partially dissolved, the purified middle fraction (10) is transported to a second process step and there the amount of KCl previously dissolved is crystallised onto the purified particles at a lower temperature, and a product of high purity evened out over its particle size and having a narrow particle size distribution is thus formed.