The results of the Khibinу Mountains high-potassium nepheline-feldspar rocks (rischorrites) mineral and material composition studies are presented. A process flow schematic is proposed for all-round dressing of the minerals in question with the view to produce non-chlorine fertilizers, alumina and amorphous silica, employing nitric acid treatment, amorphous silica washing from insoluble fraction, heavy fraction magnetic separation with production of feldspar concentrate to be activated through sintering with potash and recirculated to process head for nitric acid decomposition. Produced aluminium nitrates are processed into alumina, potash and soda.

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