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Preparation of uranium metal and dense UO2 shapes by the carbon reduction of U3O8 " (1971). 1971 Signature was redacted for privacy. 1971 Signature was redacted for privacy. The carbon reduction of UgOg has been successfully employed to yield high purity uranium metal in massive form by a two-step laboratory-scale process. The first step or operation consists of preparing an electrically conducting uranium intermediate product (oxycar-bide) by partially reducing U^Og with 7.2 moles of carbon in a graphite crucible under vacuum conditions at temperatures between 1550° and 1950°C. The refining step consists of heat­ ing this product by self-induction under vacuum to yield liquid metal in a uranium oxide crucible assembly at tempera­ tures up to about 2200°C. 2 Uranium containing a total carbon, oxygen and nitrogen concentration of less than 400 ppm can be prepared by this process. The yield of metal in the ingot on a 200-g-of-metal scale is greater than 80%. A laboratory-scale process for the preparation of dense UO2 shapes and crucibles by the carbon reduction of UgOg has been developed. The starting oxide, production grade UO3, is first wet ball-milled. Next, excess ammonium hydroxide is added to the slurry to precipitate the soluble uranium com­ pounds. The resulting uranium trioxide-ammonium diuranate slurry is then filtered, washed, dried, powderized and cal­ cined to UoOq at 700°C. Compacts prepared from charges of this UgOg with 0.7 mole of carbon (graphite powder) by cold O pressing at 30,000 lb/in sintered to greater than 95 percent of theoretical after two hours in CO2 at 1400°C. Results of this study were then applied to preparing dense UO2 crucibles by jolt packing. This was accomplished by a two-step process. In the first step, the mixed charge of U3O8 and carbon is jolt-packed in the form of a crucible within a graphite mold and then heated to 900°C under 3 nitrogen. Enough densification is produced so that the crucible can be removed and sintered under a CO2 atmosphere at 1400°C in a graphite-free environment.