Uranium (IV) ammonium fluoride can be precipitated from uranyl nitrate solution quantitatively. Ferrous salts in the presence of ammonium and fluoride ions reduce the uranium to the four state, simultaneously precipitating the double salt. This compound can be decomposed in vacuo at 375 C, yielding uranium tetrafluoride. Reduction of the tetrafluoride with calcium by the bomb technique gives satisfactory metal yields;however, co-precipitated iron impurities are concentrated in the uranium button.
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