METHOD OF PREPARING POTASSIUM CHLORIDE FROM SYLVINITE ORES Russian patent published in 1999 - IPC

FIELD: concentration of sylvinite ores in preparation of potassium chloride. SUBSTANCE: method comprises crushing and milling ore to grain size of 90% degree of salt minerals, ratio of upper limit of grain size of milled ore to average particle size in final flotation concentrate is 2.5-3.0. Prior to flotation, ore of grain size of larger than 1.2 mm is classified as grain size of 0.8-0.6 mm and coarse and fine fractions are separately conditioned and subjected to combined flotation, and the resulting tailings of coarse fraction are then subjected to control flotation and coarse fraction of control flotation tailings is further milled to grain size of 0.8 mm. EFFECT: improved quality of potassium chloride due to larger fractions in final flotation concentrate. 3 cl, 1 dwg, 1 tbl