Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table.A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.Uranium is weakly radioactive because all isotopes of uranium are unstable; the half-lives of its naturally occurring isotopes range between 159,200 years and 4.5 billion years.
Uranium, being the heaviest naturally-occurring element, is widely dispersed in the Earth’s crust, rocks and soils at a level of approximately 1–4 ppm by weight (Gavrilescu et al., 2009).Yet, the average U concentration in plants, animals, and ocean water is approximately 10 −7 g/g because of the low solubility of U(VI) compounds in water (Szabó et al., 2009).
Mar 22, 2021· BUCHAREST (Romania), March 22 (SeeNews) - Nuclearelectrica [BSE:SNN], the operator of Romania's sole nuclear power plant (NPP) Cernavoda, said it has signed an agreement to acquire some assets within the uranium concentrate processing line at the Feldioara Branch owned by the National Uranium Company, CNU.
Mar 16, 2021· Iran has started enriching uranium at its underground Natanz plant with a second type of advanced centrifuge, the IR-4, the U.N. nuclear watchdog said in a report reviewed by Reuters on Tuesday, in a further breach of Tehran's deal with major powers. Iran has recently accelerated its breaches of the deal's restrictions on its nuclear activities in an apparent bid to pressure U.S. …
The process used to increase the amount of uranium-235 relative to uranium-238 is known as uranium enrichment. U.S. civilian power plants typically use 3 to 5 percent uranium-235. Weapons use “highly enriched uranium” (HEU) with over 90 percent uranium-235.
Mar 17, 2021· Canada Silver Cobalt Works Inc. is pleased to release preliminary bench-scale results on flotation tests on the Beaver Tailings being done at SGS Lakefield, Ontario, Canada . Highlights First ...
Iran is now enriching and stockpiling uranium at levels well beyond the deal’s parameters, but nowhere near the levels it was at before the 2015 deal. By RON KAMPEAS/JTA. 19/12/2020.
Annual uranium production was about 3,400 t, of which more than 90% was produced by Priargunsky. Uranium-bearing ores and solutions were processed to generate uranium concentrates, which were shipped for further reprocessing at the JSC Chepetsky Mechanical Plant. The country's annual natural uranium consumption amounted to approximately 9,000 t.