Apparatus for the continuous precipitation of uranium peroxide
OwnerPaul Borner, Hans-Jorg Isensee +1inventors
InventorsPaul Borner, Hans-Jorg Isensee, Horst Vietzke
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Abstract
A process and apparatus for the production of pourable, directly compactable uranium dioxide powder by continuous precipitation of uranium peroxide from a stirred uranyl nitrate solution at a pH of 1-2.5 with hydrogen peroxide, calcining of the peroxide at 500.degree.-800.degree. C. and subsequent reduction at 550.degree.-750.degree. C. The precipitation solution contains 70-150 g/l of uranium and 0.80 g/l of ammonium nitrate and is treated with 15-20% aqueous hydrogen peroxide solution in the ratio of U:H.sub.2 O.sub.2 from 1:1.5 to 1:3 and there is led through the solution a mixture of ammonia and air having an air-ammonia volume ratio of 1:0.3-0.6.
Claims2
An apparatus for the continuous precipitation of uranium peroxide consisting essentially of a container, a stirrer therein having a rotor cage about 1/3 as large in diameter as the diameter of said container, a first conduit (1) including a first annular nozzle (9) in the container connected to a source of uranyl nitrate, a second conduit (2) including a second annular nozzle (10) in the container connected to a source of ammonia gas-air mixture, and a third conduit (3) including a third annular nozzle (11) in the container connected to a source of aqueous hydrogen peroxide, said second nozzle being located in the container at a distance of 80 to 120 mm above said first nozzle and said third nozzle being located in the container at a distance of 40 to 60 mm above said second nozzle.
Dependencies are inferred from the claim text.