초록 ▼

Making uranium dioxide pellets of controlled grain size by treating 50-500 g/l UO2F2 with NH3 in a first and a second stages to form (NH4)2U2O7 precipitate, wherein the NH3/U molar ratio is between 3-5 in the first stage and between 6-12 in the second stage. The precipitate is then formed into UO2 p

Making uranium dioxide pellets of controlled grain size by treating 50-500 g/l UO2F2 with NH3 in a first and a second stages to form (NH4)2U2O7 precipitate, wherein the NH3/U molar ratio is between 3-5 in the first stage and between 6-12 in the second stage. The precipitate is then formed into UO2 pellets having grain size within the range from 10 to 100 m

대표청구항 ▼

A process for fabricating UO2 pellets of controlled grain size comprising: (i) treating an aqueous solution of 50 to 500 gl-1 of UO2F2, containing no HF, with NH3 at a molar ratio of NH3/U of from 3 to 5, to obtain a slurry of a precipitate of ADU (NH4)2U2O7 and an aqueous solution which also contai

A process for fabricating UO2 pellets of controlled grain size comprising: (i) treating an aqueous solution of 50 to 500 gl-1 of UO2F2, containing no HF, with NH3 at a molar ratio of NH3/U of from 3 to 5, to obtain a slurry of a precipitate of ADU (NH4)2U2O7 and an aqueous solution which also contains U; (ii) adding NH3 to said solution to obtain an ADU (NH4)2U2O7 precipitate at a NH3/U molar ratio of from 6 to 12; (iii) filtering and drying said (NH4)2U2O7 precipitate; (iv) calcining and reducing said (NH4)2U2O7 under a hydrogen atmosphere forming UO2 powder; (v) compacting said UO2 powder; and (vi) sintering said compacted UO2 powder in a H2 atmosphere, forming pellets of UO2 of a grain size of from 10 to 100 m