2. THE MEHTOD OF MANUFACTURING SODIUM NITRATE PRILLS FROM AQUEOUS SODIUM NITRATE SOLUTIONS WHICH COMPRISES CIRCULATING MOLTEN SODIUM NITRATE THROUGH A HEATING ZONE, SUPERHEATING THE CIRCULATING MELT TO APPROXIMATELY 350* TO 400* C., FLOWING A FILM OF THE SUPERHEATED MELT DOWNWARLDY THROUGH A MIXING ZONE, ADDING AQUEOUS SODIUM NITRATE AT A CONTROLLED RATE TO THE FLOWING FILM AT A POINT PROVIDING COMPLETE MIXING TIME WITHIN THE MIXING ZONE, REMOVING FLASHED STEAM FROM THE MIXING ZONE, REMOVING SODIUM NITRATE FROM THE MIXING ZONE IN FUSED FORM, SPRAYING MOLTEN SODIUM NITRATE INTO A PRILLING TOWER AND RECYCLING MOLTEN SODIUM NITRATE TO A HEATING ZONE.