Method for manufacturing spherical particles out of liquid phase
AssigneeNukem GmbH
InventorsEgbert Brandau, Hans Huschka, Martin Kadner, Waldemar Schroder
Life of this patent
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Abstract
To manufacture spherical particles out of liquid phase with a narrow grain spectrum using melting temperatures of up to 1500.degree. C. by generating droplets by means of vibrating nozzles, the liquid phase, the nozzle and the drop distance for the droplets are maintained at a constant temperature of 1.degree. to 10.degree. C. above the melting temperature of the liquid phase until the spherical shape of the falling droplets has stabilized. The particles must then be abruptly chilled.
Claims7
A method for the manufacture of spherical particles having a grain size in the range 5.mu. to 5 mm by melting the material from which the particles are formed and solidifying it, said method comprising the steps of
- a) melting said material,
- b) feeding the melted material into a vibrating nozzle,
- c) forming the melted into droplets by allowing them to fall through a first drop zone, the distance through which the droplets fall in said first drop zone being sufficiently high for the droplets of melted material to form into spherical droplets,
- d) maintaining the temperature of said material as it falls through said first drop zone in the range 1.degree. to 10.degree. C. above the melting point of said material,
- e) allowing the droplets to fall through a second drop zone,
- f) solidifying the spherical droplets as they fall through said second drop zone by suddenly chilling them, by maintaining the temperature in said second drop zone at least 100.degree. C. below the melting point of the material,
- g) thermally separating said first drop zone and said second drop zone, and
- h) collecting the solidified droplets.
Dependencies are inferred from the claim text.