The sol‐gel process was originally developed and applied at the Oak Ridge National Laboratory for preparation of high‐density thoria‐urania fragments and microspheres for nuclear reactor fuels. The application of the process for preparation of microspheres to sols of urania, urania‐zirconia, and urania‐carbon is reported in this paper. Relatively high‐strength, spherical particles of UO2, UO2‐ZrO2, and UC2 were prepared with diameters of 50‐500 microns and densities of 80‐100% of the theoretical densities.
A polarographic method was used to measure the mass transfer coefficients between a mercury layer and an aqueous layer agitated by gas bubbles. The effects of gas rate, vessel size, and sparge-tube diameter were studied. The Schmidt number of the aqueous phase was varied by the use of sucrose solutions. The data are well represented by NSh = 1.33/VRe6-70/VSc1 .
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