| abstract |
The present invention relates to a process for the preparation of granules containing potassium, magnesium and sulfate, comprising a structural agglomeration of a salt composition which is substantially, i. at least 80 wt .-%, in particular at least 85 wt .-% and especially at least 90 wt .-%, based on the non-water components of the salt composition of finely divided, calcined polyhalite or a mixture of finely divided, calcined polyhalite and Alkali metal sulfate and / or alkaline earth metal sulfate, which is selected from potassium sulfate, magnesium sulfate, its hydrates, langbeinite and polyhalite, in the presence of water and drying of the resulting granules. The granules according to the invention are suitable as fertilizers and have a favorable release profile of the fertilizer active ingredients magnesium, potassium and sulfate. |