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"Compatibility studies of several molten uranium and ...

Niobium, tantalum, yttrium, and Inconel have been used to contain molten aluminum, lead, tin, zinc, and several of their respective uranium and thorium alloys for various times up to 3000 hours and at temperatures ranging from 600 to 1100° C. Altogether 76 capsule tests were run, almost all in a static isothermal condition. Tantalum showed the best resistance followed by …

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SOLUBILITY AND ACIDITY PROPERTIES OF TANTALUM …

Analyses were made for the elements of greater importance: uranium, thorium, niobium, tantalum, titanium, and phosphorus. Previous experiments had shown that a digestion with perchloricnitric acid mixture, solubilizing the total uranium, was advantageous over aqua regia digestion or fusions.

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Compatibility studies of several molten uranium and ...

Niobium, tantalum, yttrium, and Inconel have been used to contain molten aluminum, lead, tin, zinc, and several of their respective uranium and thorium alloys for various times up to 3000 hours and at temperatures ranging from 600 to 1100° C. Altogether 76 capsule tests were run, almost all in a static isothermal condition. Tantalum showed the ...

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Simultaneous determination of tantalum, niobium, thorium ...

Tantalum, niobium, thorium and uranium contents of 21 columbite-tantalite minerals from the Akim Oda District of Ghana have been determined using epithermal instrumental neutron activation analysis (ENAA) with a conventional counting system. As thermal neutron filters, boron carbide was encapsulated in the irradiation vials during irradiation. The samples were …

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US4451438A - Process for recovering niobium and/or ...

A process for recovering one or more non-radioactive transition metal compounds from an ore containing one or more compounds of said transition metal or metals and further containing at least one complex of a member selected from the group consisting of uranium, thorium, radium, titanium, and rare earth metals, which comprises decomposing said ore in crushed condition …

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Process for recovering niobium and/or tantalum compounds ...

@article{osti_6455849, title = {Process for recovering niobium and/or tantalum compounds from such ores further containing complexes of uranium, thorium, titanium and/or rare earth metals}, author = {Krismer, B and Hoppe, A}, abstractNote = {A process for recovering one or more nonradioactive transition metal compounds from an ore containing one or more compounds of …

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Protactinium - Element information, properties and uses ...

"Between thorium and uranium we can further expect an element with an atomic weight of about 235. This element should form a highest oxide X 2 O 5, like niobium and tantalum to which it should be analogous."

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[PDF] Hydrometallurgical removal of uranium and thorium ...

This study focused on the leaching of uranium and thorium from a high grade Ethiopian tantalite ore using sulfuric acid. The effects of variables such as acid concentration, temperature and leaching time were studied. In general, the leaching efficiency of uranium increases with increasing temperature from 100 to 300 °C whereas the opposite trend was …

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Tantalum Processing | TIC

This causes the tantalum and niobium values to dissolve as complex fluorides, and numerous impurities that were present also dissolve. Other elements such as silicon, iron, manganese, titanium, zirconium, uranium, thorium, rare earths, et c. are generally present.

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Locations of Deposits

Thorium is mined in conjunction with uranium, so much that estimates of reserves for these elements are made based off of uranium content. Thorium is typically found in the minerals thorite, thorianite and monazite however monazite is the only mineral from which Thorium is currently mined. These monazite deposits are found in placer deposits.

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SOLUBILITY AND ACIDITY PROPERTIES OF TANTALUM AND …

Analyses were made for the elements of greater importance: uranium, thorium, niobium, tantalum, titanium, and phosphorus. Previous experiments had shown that a digestion with perchloricnitric acid mixture, solubilizing the total uranium, was advantageous over aqua regia digestion or fusions.

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Sulfuric acid leaching of Kab Amiri niobium–tantalum ...

The determination of niobium, tantalum, total rare earth elements, titanium, thorium and uranium in solution were carried out using a UV–VIS spectrophotometer (Shimadzu UV-160A). The values of total iron and zirconium were obtained by Atomic Absorption Spectrophotometer (UNICAM 969). 3. Results and discussion

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Thorium - Wikipedia

Thorium is a weakly radioactive metallic chemical element with the symbol Th and atomic number 90. Thorium is silvery and tarnishes black when it is exposed to air, forming thorium dioxide; it is moderately soft and malleable and has a high melting point.Thorium is an electropositive actinide whose chemistry is dominated by the +4 oxidation state; it is quite …

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Thorium power has a protactinium problem - Bulletin of the ...

In 1918, Austrian-Swedish physicist Lise Meitner and German chemist Otto Hahn were on a quest to discover the long-lived isotope of "eka-tantalum" predicted to lie between thorium and uranium in the periodic table. The isotope they sought would decay to actinium, which was always found with uranium but was known to be the parent of an ...

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About tantalum - TIC

This causes the tantalum and niobium values to dissolve as complex fluorides, and numerous impurities that were present also dissolve. Other elements such as silicon, iron, manganese, titanium, zirconium, uranium, thorium, rare earths, et c. are generally present. The filtration of the digestion slurry, and further processing via solvent ...

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The Chemistry Joke That Got a Student Suspended - The Atlantic

"Basically, it was me just saying start all over again," Gray told Carl Willis of the local news station WSB-TV last night. Gray was a toddler when …

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Installed Nuclear Power Capacity Grew By Over 40% in last ...

"The Atomic Minerals Directorate for Exploration and Research (AMD), a constituent unit of the Department of Atomic Energy (DAE), has the mandate to recognize, assess and augment mineral resources of uranium, thorium, niobium, tantalum, beryllium, lithium, zirconium, titanium and rare earths containing uranium and thorium in the country ...

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Early Study of Radioactivity: Marie Sklodowska Curie

Thorium oxide surpasses even metallic uranium in activity. It is remarkable that the two most active elements, uranium and thorium, are the ones which possess the greatest atomic weight. Cerium, niobium, and tantalum appear to be slightly active.

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Ion exchange separation of trace amounts of uranium and ...

10%Separation method of a few ppb of uranium and thorium in tantalum metal by ion exchange for neutron activation analysis was established. After dissolving tantalum metal by hydrofluoric acid, uranium and thorium were separated from tantalum using cation exchange resin column in 0.5M hydrofluoric −0.65M boric acid media. Both of the yields for uranium and …

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Uranium - Wikipedia

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 …

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Mkango Renews Thambani Uranium Licences For Five Years In ...

Assay results from 128 rock samples collected during the 2019/2020 exploration programme returned uranium, tantalum and niobium values ranging up to 0.74% U 3 O 8, 0.41% Ta 2 O 5 and 3.24% Nb 2 O 5.

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Sulfuric acid leaching of Kab Amiri niobium–tantalum ...

The leaching behaviour niobium, tantalum, thorium, uranium, titanium and rare earth elements has been investigated on tantalite minerals collected from Kab Amiri using H 2 SO 4 at different ...

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Mkango Renews Thambani Uranium Licences For Five Years In

Assay results from 128 rock samples collected during the 2019/2020 exploration programme returned uranium, tantalum and niobium values ranging up to 0.74% U 3 O 8, 0.41% Ta 2 O 5 and 3.24% Nb 2 O 5.

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Niobium and tantalum - USGS

Niobium and tantalum are transition metals that are almost always found together in nature because they have very similar physical and chemical properties. Their properties of hardness, conductivity, and resistance to corrosion largely determine their primary uses today. The leading use of niobium (about 75 percent) is in the production of high-strength steel alloys used in …

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Leaching characteristics and kinetics of radioactive ...

The tantalum (Ta)/niobium (Nb) tailing is the tailing after smelting Ta/Nb ore. The tailing contains a certain amount of radioactive element uranium (U) and thorium (Th). U and Th from Ta/Nb tailing were leached by nitric acid and sulfuric acid. Leaching effect and kinetics were investigated under the conditions of different acid concentration, temperature, liquid–solid ratio …

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Simultaneous determination of tantalum, niobium, thorium ...

10%Tantalum, niobium, thorium and uranium contents of 21 columbite-tantalite minerals from the Akim Oda District of Ghana have been determined using epithermal instrumental neutron activation analysis (ENAA) with a conventional counting system. As thermal neutron filters, boron carbide was encapsulated in the irradiation vials during irradiation. The …

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Mohs Hardness for all the elements in the Periodic Table

N/A. Notes on the Mohs Hardness of particular elements: Carbon: Value given for graphite. Diamond value is 10.0. Praseodymium: converted from Vickers scale. Neodymium: converted from Vickers scale. Samarium: converted from Vickers scale. Europium: converted from Vickers scale. Gadolinium: converted from Vickers scale.

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Direct determination of uranium and thorium in minerals by ...

Uranium and thorium oxides were provided by V. G. Khlopin Radium Institute (St. Petersburg, Russia). Samples and sample preparation One of the primary advantages of time-of-flight mass spectrometry with pulsed glow discharge ionisation in combined hollow cathode is its applicability for the analysis of both conducting and dielectric solids with ...

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Process for recovering tantalum and/or niobium compounds ...

Due to the uranium and thorium content, the composite material is considered a radioactive source material. The key components recovered by the method are tantalum, niobium (columbium) and scandium due to their high commercial value. The process further includes the capability to recover uranium, thorium, rare earth, and zirconium products.

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Tantalum - Periodic Table

Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting …

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FMRI, Inc. (Fansteel) | NRC.gov

The Fansteel facility extracted tantalum and columbium from uranium ore, thorium ore, and tin slag feedstock by using an acid digestion process. The digestion process did not specifically extract the uranium and thorium from the ore. The radioactive residues from the operations were disposed in acidic Ponds 2, 3, and 5.

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