干法转化工艺制备UO2粉末的热力学计算

doi:10.3866/PKU.WHXB2014Ac19

Abstract

Abstract:

A dry conversion process to produce UO₂ powder is reported. Uranium fluoride (UF₆) is directly hydrolyzed with water vapor from a concentric nozzle to form uranyl fluoride (UO₂F₂), which is transferred to a rotary kiln by a screw and reduced to ceramic-grade uranium dioxide (UO₂) powder with backward mixing gases of vapor and hydrogen. Several of the main reactions and thermodynamics calculations for conversion of gaseous UF₆ to UO₂ powder are reported, including reactions for UO₂F₂+H₂O/H₂→UO₂/UO₃ and UO₂+HF→UF₄. The influence of the temperature of the first zone and the gas atmosphere of H₂O-H₂-HF on the fluorization of UO₂ by HF in term of thermodynamics are also discussed. Moreover, the influences of the dry conversion process parameters on the UO₂ physical properties are analyzed by qualification test results.

Key words: Dry conversion process, UO₂ powder, UO₂F₂, Fluorization reaction

MSC2000:

O641

PAN Jia-Ye. Thermodynamic Calculations for UO₂ Powder Fabrication by a Dry Conversion Process[J].Acta Phys. -Chim. Sin., 2015, 31(Suppl): 19-24.

References

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Thermodynamic Calculations for UO₂ Powder Fabrication by a Dry Conversion Process

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Thermodynamic Calculations for UO₂ Powder Fabrication by a Dry Conversion Process