Production of uranium dioxide
Patent 4020146 Issued on April 26, 1977. Estimated Expiration Date: 
April 26, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 26, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3160471 3235327 3547598 3765844 InventorAssigneeApplicationNo. 05/376847 filed on 07/05/1973US Classes:423/261, Dioxide252/625, RADIOACTIVE COMPOSITIONS252/636, Nuclear reactor fuel423/19, Volatizing423/253, Uranium compound423/258Fluorine containingExaminersPrimary: Padgett, Benjamin R.Assistant: Gron, Teddy S. Attorney, Agent or FirmAbstractA three stage fluidized bed process for converting uranium hexafluoride (UF6) to a ceramic-grade uranium dioxide (UO2) powder by first, reacting hydrogen and steam with UF6 in a first fluidized bed in a temperature range of from about 475° to 600° C to form solid intermediate products UO2 F2 and U3 O8 ; second, reacting hydrogen and steam with the intermediate products in a second fluidized bed at a temperature ranging from about 575° to about 675° C to produce a second group of intermediate products including UO2 F2, U3 O8, and UO2 ; and, third, reacting hydrogen and steam with the second group of intermediate products in a third fluidized bed at a temperature of 575° to 675° C to produce ceramic grade UO2 powder having low residual content of fluorides and other foreign materials. |
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