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Abstract

The present disclosure relates to a process for the production of potassium sulphate based mineral fertilizers, by means of an exchange reaction between potassium chloride and ammonium sulphate (2KCl+(NH₄)₂SO₄<→K₂SO₄+2NH₄Cl) in controlled conditions. The process, subject of the invention, makes it possible to obtain, in a single reaction stage, a crystalline product classifiable as low-chlorine-content mineral fertilizer, containing potassium sulphate, with K₂O in an amount of between 40% and 50% by dry weight, ammoniacal nitrogen in an amount of less than 5% by dry weight and chlorine in an amount of less than 3% by dry weight, with a high potassium-conversion efficiency (calculated as the ratio between what the amount found in the solid main product and the amount introduced as KCl to the reaction with ammonium sulphate) and a by-product, which can be used directly as NK fertilizer (containing nitrogen (N) and potassium oxide (K₂O) both in an amount comprised between 15% and 20% by dry weight) or as raw material for the production of complex fertilizers.

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First Claim