By P N Paleĭ; D I Ri︠a︡bchikov; Mark Moiseevich Seni︠a︡vin; Institut geokhimii i analiticheskoĭ khimii im. V.I. Vernadskogo
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Additional resources for Analytical chemistry of uranium
Uranium oxide dissolution in strong acids forms uranyl ions that are readily soluble in several types of organic compounds (like diethylether or tributylphosphate—TBP). This property serves in the separation of uranium from other components of irradiated fuel or from other elements in the purification process of uranium ores. 3 g cm−3 and melting point of 1150°C. It is one of the most stable uranium compounds and as such has been a candidate for long-term geologic storage and disposal of uranium in repositories.
UF6 can form stable solutions with some organic solvents, mainly per-fluorinated hydrocarbons as well as anhydrous HF and halogen fluorides, but reacts with common solvents like ethanol, ether, and benzene at ambient temperature. UF6 is inert in several dry gases like nitrogen, oxygen, CO2, chlorine, and bromine. Its reaction with reducing agents leads to formation of UF4 and intermediate uranium fluoride compounds mentioned earlier. 4b) This is an autocatalytic reaction that can continue in principle until all the silica or the UF6 is consumed while the HF and H2O molecules remain in the system.
Second, uranium itself may be a by-product of other processes like gold extraction, niobium, and tantalum production or phosphoric acid manufacture. Thus, recovery of low levels of uranium from phosphates, columbite, or gold-bearing minerals may not be economical in itself, but extracting uranium as a by-product from the waste streams of these operations could be commercially sensible. The UOC is dried and packed in metal drums and marketed, that is, sent to the UCF. The remainder of the ore, containing most of the radioactivity (from uranium progenies) and nearly all the rock waste material, becomes mine tailings that are placed in storage facilities near the mine.
Analytical chemistry of uranium by P N Paleĭ; D I Ri︠a︡bchikov; Mark Moiseevich Seni︠a︡vin; Institut geokhimii i analiticheskoĭ khimii im. V.I. Vernadskogo