Kernforschungsanlage Julich Gesellschaft MIT Beschrankter Haftung

Paul Naefe

Hans Langen

Helmut Ringel

A vibrating nozzle produces a stream of drops of a nitrate solution that attain spherical drop shape before entering an ammonia gas phase where gas supply nozzles direct streams of ammonia gas obliquely against the drop stream with a component of motion in the direction of movement of the droplet stream, the incidence of the gas streams on the droplet stream being offset a few millimeters from each other along the path of the droplet stream. The flow of gas is at a speed 10 to 20 times that of the velocity of the drops of solution that are uniformly hardened on the surface in their spherical shape so that there is no deformation upon entering the aqueous solution of ammonia in the lower part of the container that confines the ammonia gas phase. The ammonia solution completes the conversion of the nitrate to the corresponding oxide, producing highly uniform spheres such are required for subsequent sintering in the production of nuclear fuel or breeder elements.

Method and apparatus for producing spherical particles of uniform size

An arrangement for the production of spherical particles from drops of aqus solutions of nitrates constituted of uranium, plutonium or thorium, as well as mixtures of these materials for the fuel and breeder elements for nuclear reactors. The arrangement includes a receptacle for an aqueous and a superimposed gaseous ammonia phase, as well as a spray nozzle for producing the drops which is provided with a vibrator and is in communication with a receptacle for the fuel or breeder material solution, wherein the drops traverse the ammonia gas phase under the influence of gravity and also a horizontally-directed force, while traversing the aqueous ammonia phase under only the influence of gravity.

Arrangement for the production of spherical particles from drops of

A device for making ball-shaped metal oxide and metal carbide particles, ecially particles of fuel or breeder substances for nuclear reactors such as oxidic or carbide cores of uranium or the like. The device comprises a container for the ammonia and organic phase, and an injection tube leading into the top of the container. The injection tube is surrounded by a mantle passage of which the cross section is widened in the region of the mouth of the injection tube. The injection tube leads into the container at a distance of from 0.5 to 2 mm. ahead of the end of the mantle passage. The injection tube has an outward diameter which steadily decreases toward the mouth of the injection tube.

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Aachen, Germany

Paul Naefe