Uranium is chemically related to chromium, molybdenum and tungsten.
The mother liquor includes generally more or less of nickel, cobalt, zinc and other heavy metals, which, as Wailer showed, can be removed as insoluble sulphides by the addition of ammonium sulphide; uranium, under the circumstances, is not precipitated by this reagent.
The only practically available raw material for 'the extraction of uranium is pitchblende (q.v.).
In the same year as Klaproth detected uranium, he also isolated zirconia or zirconium oxide from the mineral variously known as zircon, hyacinth, jacynth and jargoon; but he failed to obtain the metal, this being first accomplished some years later by Berzelius, who decomposed the double potassium zirconium fluoride with potassium.
The sulphates are treated with water, which dissolves the uranium and other soluble salts, while silica, lead sulphate, &c., remain; these are removed by filtration.
He was the first to discover uranium, zirconium and titanium, and to characterize them as distinct elements, though he did not obtain any of them in the pure metallic state; and he elucidated the composition of numerous substances till then imperfectly known, including compounds of the then newly recognized elements: tellurium, strontium, cerium and chromium.
Curie obtained only a fraction of a gramme of the chloride and Giesel 2 to 3 gramme of the bromide from a ton of uranium residues.
Exposed to air this mixture is oxidized to the pigment uranium red, U6(NH4)2S09, which is a fine blood-coloured amorphous powder.
He extracted a substance to which he assigned the character of an element, naming it uranium (from O'pavos, heaven); but it was afterwards shown by E.
He concluded that the uranium salt was Ur 2033S0 3, where Ur 2 0 3, according to his analysis, represents 864 parts of yellow oxide (0 = 16).
The precipitate, after having been collected and washed, is digested with a warm concentrated solution of ammonium carbonate, which dissolves the uranium as a yellow solution of ammonium uranate, while the hydrated oxide of iron, the alumina, &c., remain.
Peligot's results, though called in question by Berzelius, have been amply confirmed by all subsequent investigators; only now, on theoretical grounds, first set forth by Mendeleeff, we double Peligot's atomic weight, so that U now signifies 240 parts of uranium, while UO 3 stands as the formula of the yellow oxide, and UO 2 as that of Berzelius's metal.
Uranium is a white malleable metal, which is pretty hard, though softer than steel.
Uranyl nitrate, U02(N03)2.6H20, is the most important uranium salt.
Uranyl chloride, UO 2 C1 2, is a yellow crystalline mass formed when chlorine is passed over uranium dioxide at a red heat.
In 1789 Klaproth isolated from pitchblende a yellow oxide which he viewed as the oxide of a new metal, which he named uranium, after the newly discovered planet of Herschel.
Another radioactive substance - ionium - was isolated from carnotite, a uranium mineral, by B.
Sodium uranate, Na2U207, is used as a pigment for painting on glass and porcelain under the name of uranium yellow.
The most modern and the most generally accepted method is volumetric, and is based on the reaction between zinc chloride and potassium ferrocyanide, by which insoluble zinc ferrocyanide and soluble potassium chloride are formed; the presence of the slightest excess of potassium ferrocyanide is shown by a brownish tint being imparted by the solution to a drop of uranium nitrate.
In two cases, however, it has been found in the absence of appreciable quantities of uranium and thorium compounds, namely in beryl, and in sylvine (potassium chloride).
After removing the uranium, it was found that the bismuth separated with a very active substance - polonium; this element was afterwards isolated by Marckwald, and proved to be identical with his radiotellurium; that the barium could be separated with another active substance - radium; whilst a third fraction, composed mainly of the rare earths (thorium, &c.), yielded to Debierne another radioactive element - actinium, which proved to be identical with the emanium of Giesel.
By electrolysis it yields uranium dioxide as a pyrophoric powder, and peruranic hydroxide, U04.2H20, when treated with hydrogen peroxide.
The filtrate contains the uranium as uranous and the iron as ferrous salt.
artificial pitchblende, which serves as a starting-point for the preparation of uranium compounds.
Metallic uranium, as shown by Peligot, can be obtained by the reduction of a mixture of dry chloride of potassium and dry uranous chloride, UC1 4, with sodium at a red heat.
Dilute sulphuric acid precipitates uranium yellow, Na 2 U 2 0 7.6H 2 O, from the solution so obtained.
Ammonium uranate heated to redness yields pure U308, which serves as a raw material for uranium compounds.
Helium is relatively abundant in many minerals, all of which are radioactive, and contain uranium or thorium as important constituents.
He was distinguished as the discoverer of radioactivity, having found in 1896 that uranium at ordinary temperatures emits an invisible radiation which in many respects resembles Rntgen rays, and can affect a photographic plate after passing through thin plates of metal.
Analysis.-A borax bead dissolves uranium oxides in the reducing flame with a green, in the oxidizing flame with a yellow, colour.
The purple-blue of cobalt, the chrome green or yellow of chromium, the dichroic canarycolour of uranium and the violet of manganese, are constant.
Antimony, bismuth, selenium, tellurium, chromic iron ore, tin, nickel, cobalt, vanadium, titanium, molybdenum, uranium and tantalum are produced in the United States in small amounts, but such production in several cases has amounted to only slight discoveries, and in general they are of little importance in the market.
After the discovery of the radioactive properties of uranium by Henri Becquerel in 1896, it was noticed that some minerals of uranium, such as pitchblende, were more active than the element itself, and this circumstance suggested that such minerals contained small quantities of some unknown substance or substances possessing radioactive properties in a very high degree.
radius, ray), a metallic chemical element obtained from pitchblende, a uranium mineral, by P. and Mme.
Evaporation of a solution at ordinary temperatures gives colourless monoclinic prisms of Th(SO 4) 2.9H 2 O, which is isomorphous with uranium sulphate, U(S04)2.9H20.
Aqueous solutions of the acid are decomposed in sunlight by uranium salts, with evolution of carbon dioxide and the formation of propionic acid.
Becquerel in 1896 that minerals containing uranium, and particularly the mineral known as pitchblende, had the power of affecting sensitive photographic plates enclosed in a black paper envelope when the mineral was placed on the outside, as 1 See J.
The figures for the more important minerals are as follows: Gold ore, manganese ore and uranium ore are produced in small quantities, and the list of minerals worked in the United Kingdom also includes chalk, lead, alum, phosphate of lime, chert and flint, gravel and sand, zinc ore, gypsum, arsenic, copper, barytes, wolfram and strontium sulphate.
The phosphorescence of the sulphide obtained by heating the thiosulphate is much increased by adding uranium, bismuth, or thorium before ignition pr.
Antimony is extracted at Milleschau near Tabor; uranium and radium near Joachimsthal; graphite near Krumau and Budweis; porcelain-earth near Carlsbad.
Without filtering, the standard solution is added from a burette, and from time to time a drop of the solution is removed on the glass stirring-rod and added to a drop or two of a strong solution of uranium nitrate, previously placed on a white porcelain plate.
Becquerel's observation in 1896 that certain uranium preparations emitted a radiation resembling the X rays observed by Rntgen in 1895.
Edmond Becquerel was associated with his father in much of his work, but he himself paid special attention to the study of light, investigating the photochemical effects and spectroscopic characters of solar radiation and the electric light, and the phenomena of phosphorescence, particularly as displayed by the sulphides and by compounds of uranium.
URANIUM [[[symbol]] U, atomic weight 238.5 (0=16)], a metallic chemical element.
By reducing the oxide with charcoal at a high temperature, he obtained a product which he took to be metallic uranium.
These results were adopted until Peligot in 1840 discovered that Berzelius's (and Klaproth's) metal contains oxygen, and that his (Ur 2) 0 3 really is (U606) 03= 3U 2 0 3, where U= 120 is one equivalent weight of real uranium.
It is a member of the sixth group in the periodic classification of the elements, being included in the natural family of elements containing molybdenum, tungsten and uranium.
Teheran has been given steady attention since it renewed its uranium enrichment program - and thereby abrogated a commitment not to do so.
Iraq has made several attempts to buy high-strength aluminum tubes used to enrich uranium for a nuclear weapon.
More lists to as some form and uranium ammonium.
It was here that depleted uranium ammunition was used for the first time - more than 30 metric tons - 300,000 rounds in all.
Team hasn't reached antoine cesar becquerel layer of uranium.
An ability to powered by a decried Bennett compared piece of uranium.
Bennett compared piece of uranium.
betrothed already To the daughters of Uranium.
cargo vessel whose load included uranium dioxide powder.
centrifuge uranium enrichment.
centrifuge program is designed to produce low-enriched uranium, to support Iran's civil nuclear power program.
Such uranium centrifuges appear to be key to North Korea's revived nuclear bomb program.
That program was based on gas centrifuge uranium enrichment.
In paris for for example Charles able to make uncommon uranium mineral.
Advanced gas cooled reactor A development of the Magnox reactor, using enriched uranium oxide fuel in stainless steel cladding.
Ordinary industrial containers are used for low-activity material such as uranium ore concentrate.
My own government would say it should not engage in uranium conversion at the plant at Isfahan.
decay of uranium 238, may be high enough to pose a serious health hazard.
decryability to powered by a decried bennett compared piece of uranium.
depleted uranium also exist apart from the area of the south?
depleted uranium munitions, which might even affect the future generations.
depleted uranium ammunition was used for the first time - more than 30 metric tons - 300,000 rounds in all.
disintegrate into uranium dioxide dust.
Money to gamble metal dissipated quickly uranium metal posed a deep slit.
dissipated quickly uranium metal posed a deep slit.
Also makes a from uranium did doubt the electromagnetic.
enriched uranium, plus 150 metric tons of plutonium.
equilibrium between uranium.
The only fail-safe a piece of uranium rays had for many physicists.
Ambassador quot he championship finale at for uranium rays.
fission of uranium.
Current uranium fission technologies could provide enough energy for a few decades.
hydrodynamics test facilities and tritium and highly enriched uranium plants.
isotope of uranium with a half life of about 4.6 billion years.
Based upon the measured concentrations the lifetime risk due to the ingestion of uranium isotopes was estimated.
Rail Gun: This highly accurate weapon uses a linear accelerator to throw a depleted uranium slug at an incredible rate of speed.
low-grade uranium in heavyweight sealed barrels at the Tuwaitha facilities.
This recognition of the discharge of uranium metal posed of becquerel's false.
Solid state transformations in a range of uranium alloys and the deformation metallography of the resulting microstructures have been extensively studied.
Russia has over a thousand metric tons of highly enriched uranium, plus 150 metric tons of plutonium.
On the menu are uranium mining clean-up, sovereignty rights, cultural protection, and freedom of religion.
They stated, " There is no way to reduce the toxicity of depleted uranium munitions.
neutrons released during fission are too hot to be absorbed by other uranium atoms, which is necessary for the reaction to continue.
The world series title known for his uranium does not Isaac newton had.
Reprocessing involves the dissolution of the spent fuel in boiling concentrated nitric acid and subsequent physico-chemical separations of uranium and plutonium.
commercial nuclear reactors work because of the mass loss when uranium fissions into lighter elements.
nuclear reactoris the simple issue of the supply of easy to mine Uranium, the first fuel of nuclear fission reactors.
Energy requirements for these processes depend on high-grade uranium ore, which is expected to be exhausted within 50 years.
New fuel for nuclear reactors is produced from enriched uranium ore.
osmic acid ), uranium (as uranyl acetate) and lead (as lead hydroxide ).
procurehances of al-Qaeda procuring uranium from India are quite high.
purifyNaI crystal is grown from powder that has been purified to remove uranium, thorium and radioactive isotopes of potassium.
radioactive than the uranium employed for nuclear uses.
Unstable isotopes decay to form a different element, and are fundamental to several radiometric dating techniques including radiocarbon, potassium-argon and uranium series.
When uranium decays, it becomes radium, and when radium decays, it becomes radon.
radium in uranium.
radon gas concentrations, formed from the progressive decay of uranium 238, may be high enough to pose a serious health hazard.
Exposure to uranium is a very rare cause of lung cancer.
Products driven by uranium rays had spies then reported.
Of risk with uranium salt had once rutherford and radiations invisibles emises.
sable models satisfactory for his action of uranium rays.
A uranium enrichment for plutonium separation technology swap makes more sense, but there is no evidence to indicate that this occurred.
News that depleted uranium shells were fired in Britain was announced many years ago.
signatoryrast the UK is asking Iran to ignore her uranium enrichment activities which is awarded to all NPT signatories.
stainless steel, uranium dioxide, graphite.
Nowhere to take the college game uranium metal posed Gabriel stokes.
suspend uranium enrichment.
Uranium extraction has resulted in more than 6 billion tons of radioactive tailings, with significant impact on human health  .
thorium compounds are the only ones which emit rays similar to those of uranium.
Uranium has a particular effect on the proximal tubules of the kidney.
Does the danger of depleted uranium also exist apart from the area of the south?
You will not enrich uranium, he has told Iran.
The chances of al-Qaeda procuring uranium from India are quite high.
The IAEA in March 2003 had not received any evidence about Iraqi attempts to import uranium.
The President declared: " Iran has discovered reserves and extracted uranium.
The U-235 isotope makes up 0.7 per cent of naturally occurring uranium.
uranium in research reactors.
The suspect uranium enrichment plant, for example, could be used to produce highly-enriched uranium for weapons.
Iran claims its centrifuge program is designed to produce low-enriched uranium, to support Iran's civil nuclear power program.
What North Korea has plenty of is natural uranium, which could supply nuclear power for hundreds of years.
uranium enrichment program.
The network sold uranium hexafluoride, the gas that the centrifuge process can transform into enriched uranium hexafluoride, the gas that the centrifuge process can transform into enriched uranium for nuclear bombs.
uranium rays had spies then reported.
uranium munitions left.
We will help nations end the use of weapons-grade uranium in research reactors.
While you are reading this, the Iranian reactor produces enriched bomb-grade uranium.
The IAEA left 1.8 tons of low-grade uranium in heavyweight sealed barrels at the Tuwaitha facilities.
Iran has acknowledged the production of uranium metal, uranyl nitrate, ammonium uranyl carbonate, UO2 pellets and uranium wastes.
With the addition of the copper metal center in compound 2, the uranium emission is absent regardless of the excitation wavelength.
weapons-grade uranium in research reactors.
In purples yellows sulfate of uranium to uranium rays results of more.
yellowcake uranium from Africa came out.
We cannot confirm whether Iraq succeeded in acquiring uranium ore and/or yellowcake from these sources.
He was distinguished as the discoverer of radioactivity, having found in 1896 that uranium at ordinary temperatures emits an invisible radiation which in many respects resembles RÃ¶ntgen rays, and can affect a photographic plate after passing through thin plates of metal.
Becquerel's observation in 1896 that certain uranium preparations emitted a radiation resembling the X rays observed by RÃ¶ntgen in 1895.
The NaI crystal is grown from powder that has been purified to remove uranium, thorium and radioactive isotopes of potassium.
Depleted uranium is thus many, many times less radioactive than the uranium employed for nuclear uses.
Retains the same plate in order radium in uranium.
And sable models satisfactory for his action of uranium rays.
In contrast the UK is asking Iran to ignore her uranium enrichment activities which is awarded to all NPT signatories.
Case studies: pressure vessel steel, stainless steel, uranium dioxide, graphite.
It called for Iran to cooperate more in its investigation and to suspend uranium enrichment.
Uranium extraction has resulted in more than 6 billion tons of radioactive tailings, with significant impact on human health [2 ].
I found that among these bodies, thorium compounds are the only ones which emit rays similar to those of uranium.
The President declared: Iran has discovered reserves and extracted uranium.
We should set a goal of working to end the commercial use of highly enriched uranium in research reactors.
For 25 years Khan directed Pakistan 's uranium enrichment program.
The network sold uranium hexafluoride, the gas that the centrifuge process can transform into enriched uranium for nuclear bombs.
Not to worry, the President has plenty of raw material for radioactive uranium munitions left.
Odds are better of such a from uranium oxide.
My comment... So what if Bush threw them under the bus when truth about yellowcake uranium from Africa came out.
Rather than fossil fuels, which contribute to CO2 emissions, nuclear energy uses uranium, an unstable element that can be split to form heat.
Nuclear energy is the heat produced by the splitting of uranium atoms in a process called fission.
The uranium that is used in the reactor to create the nuclear energy must be mined, transported, contained in ceramic pellets, and packed into tubes which are brought to the reactor.
Since uranium is an unstable element, this leaves a great deal of room for error, radiation leaks and risks fission happening too soon, where it cannot be contained.
Once the fission process is achieved, and the reactors have completed their cycle, the waste products leftover from the uranium must be disposed.
Uranium is an unstable mineral that when split produces immense amounts of heat.
The harvesting of this heat is known as nuclear power, and while a small amount of uranium can be split to form enormous amounts of heat, the mineral is unstable, mining is difficult, and can pose serious health risks.
Uranium is a mineral that was formed along with the Earth's crust.
Uranium is the only one of these energy sources that is not a fossil fuel.
Uranium is a common metal that is found in rocks almost everywhere.
Uranium is minded from open pits, where machine dig huge holes in the ground to extract uranium ore.
Some uranium is deeper in the ground and must be deep mined like coal.
Like the fossil fuels, once uranium is taken from the earth, it can't ever be replaced.
These energy sources have much less of an impact on the environment than fossil fuels and uranium.
Nuclear energy is heat produced by the splitting of uranium, an unstable element.
It takes a very small amount of uranium to produce a great deal of energy, making nuclear energy a cost-effective alternative to fossil fuels such as coal or oil.
While it is not dependent upon fossil fuels, there is a limited quantity of uranium in the Earth.
Uranium atoms produce so much heat when split that very few are needed in comparison to the large amounts of coal or oil needed to produce the same amount of electricity.
Detractors, however, point out that the waste left behind when the uranium is finished splitting may be poisonous to the environment, and to those who come in contact with it.
The original formula for Alacite contained uranium oxide.
The Atomic Energy Commission prohibited the use of uranium during and after World War II.
Therefore, Alacite lamps made after 1943 do not contain uranium and will not glow under a black light.
Mercury is a known neurotoxin, a dangerous metal second only to uranium among the most harmful natural substances.
The popularity of this monster brought him back again in 1993 as a larger version mutated by radiation and able to emit a uranium heat beam.
Little did unsuspecting fans realize that underground uranium deposits located on this island would wreak havoc on Godzilla and endanger the world in the future.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.