METHOD FOR PREPARATION OF MOISTURE RESISTANT POTASSIUM CHLORIDE WITH ENHANCED RHEOLOGICAL PROPERTIES Russian patent published in 2009 - IPC C01D3/22 

FIELD: chemistry.

SUBSTANCE: invention refers to the method for preparation of moisture resistant potassium chloride with enhanced rheological properties. The method includes compression of the concentrated potassium chloride obtained by the halurgic or flotation concentration of the sylvinite ore with the additive of the mineral substance. The aforesaid mineral substance is structure-forming salt selected from the potassium or sodium carbonate, sulphate, dihydroorthophosphate, orthophosphate or metasilicate, it is fed to the wet concentrate in the stage of structural agglomeration before drying. The latter stage is carried out at moisture level 3.0 - 5.0% in turbo-bladed mixer-granulator by the way of plastic deformation of the wet concentrate mixed with dry hot potassium chloride. The structure-forming salt is fed in amounts of 0.5 - 5.0 kg/t of the ready product (dry or in the form of water solution). The dry hot potassium chloride is fed to the stage of plastic deformation in amounts of 10 - 20% in relation to the weight of the dry agglomerated potassium chloride.

EFFECT: method is versatile and allows to obtain the fine and compression granulated potassium chloride which is able without treatment with anti-clodding agent to retain its grain size composition and flowability at storage and handling in wet climate.

4 cl, 4 tbl, 1 ex