POTASSIUM SULFATE FERTILIZER PRODUCTION PROCESS
Potassium sulfate is made primarily from potassium chloride and sulfuric acid when the by-product HCl is the dominant product. This process is called Mannheim process. It was originally developed for sodium sulfate production.
Differences between production of potassium sulfate and sodium sulfate, sodium chloride is replaced with potassium chloride. To increase the yield of potassium sulfate to a reasonable value, an evaporation stage located between the reactor and the crystallizer is used. The main steps of the production process include dissolution, reaction, and evaporation, crystallization, centrifuging, drying, and then cooling.