Recovering e.g. potassium sulfate or potassium magnesium sulfate, anhydrous or aqueous magnesium sulfate, and optionally gypsum from complex composition by a sequence of process steps consisting of e.g. crushing and mechanical separation

Recovering potassium sulfate or potassium magnesium sulfate, anhydrous or aqueous magnesium sulfate, sodium chloride and optionally gypsum from complex composition comprises: crushing the raw salt to a maximum final grain size of 4 mm with low mass fractions of particle size fractions of less than 0.5 mm; separating the fraction of the raw salt, and leaching chloridic components and sulfatic components; separately processing the chloridic and sulfatic leach solutions; and converting the finally remaining leach residues in the presence of high concentrated calcium sulfate to recover gypsum. Recovering potassium sulfate or potassium magnesium sulfate, anhydrous or aqueous magnesium sulfate, sodium chloride and optionally gypsum from complex composition having chloride, sulfate, potassium and magnesium minerals containing fixed raw materials by a sequence of process steps consisting of crushing, mechanical separation, dissolution, evaporation or loosening, comprises: crushing the raw salt to a maximum final grain size of 4 mm with low mass fractions of particle size fractions of less than 0.5 mm; separating the fraction of the raw salt with the maximum grain size of 4 mm and low mass fractions of particle size fractions of less than 0.5 mm, leaching chloridic components selectively dissolved at a temperature of less than 40[deg] C with a short residence time and leaching sulfatic components selectively dissolved at a temperature of greater than 60[deg] C with a long residence time; separately processing the chloridic and sulfatic leach solutions by known methods to recover sodium chloride, potassium chloride, potassium sulfate, potassium magnesium sulfate and magnesium sulfate; and converting the finally remaining leach residues in the presence of high concentrated calcium sulfate by a multi-stage counter current washing for a residence time of greater than two hours at a pH of 3-6.5 and a temperature of less than 50[deg] C to recover gypsum. Die Erfindung beinhaltet die Gewinnung von chloridfreien Kalidünger als Kaliumsulfat oder Kaliummagnesiumsulfat, Magnesiumsulfat als wasserfreie oder wasserhaltige Verbindung, Kaliumchlorid, Natriumchlorid und wahlweise Gips durch Verarbeitung von komplex zusammengesetzten Roh-Salzgemischen, in denen mindestens eins der Minerale Polyhalit, Langbeinit, Kainit oder Kieserit in Konzentrationen > 5% neben mindestens einem chloridischen, kaliumhaltigen Mineral und Natriumchlorid vorkommt