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Complex research of the most important physico-chemical and mechanical properties (granulometric composition, hygroscopicity, caking, dusting, compactability, friability) of model system based on potassium sulfate and experimental samples of potassium sulfate and potassium-magnesia has been conducted. The experimental samples of potassium sulfate and potassium-magnesia were obtained in the processing of polymineral ore in the presence of various amounts of impurity inorganic salts (magnesium sulfate and chloride, sodium chloride). The obtained chlorine-free fertilizers have low hygroscopicity and low caking, but they are characterized by high dusting. Studies of the influence of dust-suppressors of different chemical nature on dusting of model and experimental samples of potassium sulfate and potassium-magnesia have shown that polyethylene glycol PEG-400 has the highest dust suppression effect on these fertilizers. Using PEG-400 has no negative influence to the friability, caking and compactability of fertilizers.

The inﬂuence of impurity inorganic salts on the physico-chemical and mechanical properties of potassium sulfate and potassium-magnesia