Ion exchange separation of trace amounts of uranium and,
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 thorium during separation were above 95% and the remaining amount of tantalum be lowered below 400 ng.Determination of Uranium, Thorium, Niobium and Tantalum in,,The U.S. Department of Energy's Office of Scientific and Technical InformationSimultaneous 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.(PDF) Icp-ms determination of rare earth elements, yttrium,,Icp-ms determination of rare earth elements, yttrium, uranium and thorium in niobium-tantalum rich samples October 2013 Exploration and Research for Atomic Minerals 23:159-164Compatibility 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.Radiological Risk Assessment of Transport of Tantalum Raw,,Naturally occurring radioactivity contained in tantalum raw material (concentrates and slags) is uranium, thorium and their radioactive decay products.
Leaching characteristics and kinetics of radioactive,
09-01-2020· 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.Process for recovering niobium and/or tantalum compounds,,a process for recovering one or more nonradioactive 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, comprises decomposing said ore inAbout tantalum - TIC,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 extraction using methyl isobutyl ketone (MIBK) or liquid ion exchange using an amine extractant in kerosene, produces highly purified solutions of tantalum and niobium.The Chemistry Joke That Got a Student Suspended - The Atlantic,20-05-2014· May 20, 2014. Paris Gray, upstanding vice president of her about-to-graduate high-school class in Jonesboro, Georgia, was suspended last Friday when administrators figured out what her yearbook,(PDF) Hydrometallurgical removal of uranium and thorium,,Mulugeta et al. focused on the leaching of uranium and thorium from a high-grade Ethiopian tantalite ore using sulphuric acid. The amount of uranium leached increased from 69.1% at a contact time,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,
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 ofRadiological Risk Assessment of Transport of Tantalum Raw,,natural uranium and thorium, tantalum raw materials are considered to be naturally occurring radioactive material (NORM). The current IAEA exemption value (IAEA 2005a) for the transport of NORM (below which the requirements of the transport regulations do not apply) is 10 becquerels per gram (Bq/g, U-238 +About tantalum - TIC,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 extraction using methyl isobutyl ketone (MIBK) or liquid ion exchange using an amine extractant in kerosene, produces highly purified solutions of tantalum and niobium.Thorium power has a protactinium problem - Bulletin of the,,06-08-2018· Thorium reactors born again. Fast forward to 2018. Several nations have explored thorium power for their nuclear energy portfolios. Foremost among these is India. Plagued by perennial uranium shortages, but possessing abundant thorium resources, India is highly motivated to develop thorium reactors that can breed uranium 233.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 minimal sample preTantalum, niobium and thorium cake production at the,,01-09-2006· Thorium is both radioactive and polluting, but can be potentially as useful as uranium in the more sophisticated forms of nuclear reactor technology. It is mentioned in the schemes for further development and extension of the factory (P.O.B. P-6685) during the next three five-year periods from 1982 to 1996.
Removal of Radioactive Elements from Niobium and Tantalum Ores
tantalum and rare earths unextracted. The system sulfuric acid -diethylhexyl phosphoric acid/tributyl phosphate in kerosene was efficient to extract both thorium and uranium. The extraction was performed by contacting the sulfate leach liquor of pH=1.0 and 6.6M SO 4 2-with 0.2M D 2EHPA/TBP in the ratio A:O=3:1 for 15 minutes.The Chemistry Joke That Got a Student Suspended - The Atlantic,20-05-2014· May 20, 2014. Paris Gray, upstanding vice president of her about-to-graduate high-school class in Jonesboro, Georgia, was suspended last Friday when administrators figured out what her yearbook,Mkango Renews Thambani Uranium Licences For Five Years In,,11-11-2021· 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.Mkango renews Thambani Uranium licences for five years,,15-11-2021· Mkango Resources recently announce that the Malawi government has renewed the Thambani uranium, tantalum and niobium exploration licence and issued four retention licences granted for five years from 20 October 2021 to 19 October 2026 – covering a total of 98.4 square km. . With the recent significant increase in international uranium prices, Mkango is currentlyAbout tantalum - TIC,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 extraction using methyl isobutyl ketone (MIBK) or liquid ion exchange using an amine extractant in kerosene, produces highly purified solutions of tantalum and niobium."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
Kernenergie op thorium in plaats van aardgas en,
07-02-2017· Thorium overvloedig? Het Nuclear Energy Agency (NEA) bracht in november 2016 de plannen met thorium in kaart. Zeldzame aardmetalen, niobium, tantalum en uranium bevatten vaak ook thorium. Daarom was thorium tot nu toe een bijproduct bij de winning van genoemde stoffen. Er zijn geen mijnen waar alleen thorium wordt gewonnen.Removal of Radioactive Elements from Niobium and Tantalum Ores,tantalum and rare earths unextracted. The system sulfuric acid -diethylhexyl phosphoric acid/tributyl phosphate in kerosene was efficient to extract both thorium and uranium. The extraction was performed by contacting the sulfate leach liquor of pH=1.0 and 6.6M SO 4 2-with 0.2M D 2EHPA/TBP in the ratio A:O=3:1 for 15 minutes.Thorium power has a protactinium problem - Bulletin of the,,06-08-2018· Thorium reactors born again. Fast forward to 2018. Several nations have explored thorium power for their nuclear energy portfolios. Foremost among these is India. Plagued by perennial uranium shortages, but possessing abundant thorium resources, India is highly motivated to develop thorium reactors that can breed uranium 233.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 minimal sample preTantalum, niobium and thorium cake production at the,,01-09-2006· Thorium is both radioactive and polluting, but can be potentially as useful as uranium in the more sophisticated forms of nuclear reactor technology. It is mentioned in the schemes for further development and extension of the factory (P.O.B. P-6685) during the next three five-year periods from 1982 to 1996.Occupational radiation exposures of artisans mining,,Artisans in Masisi and other parts of the North Kivu province in the eastern Democratic Republic of Congo (DRC) mine columbite-tantalite mineral ores (also called 'coltan') for the tantalum content. The potential occupational radiation exposures in the course of this operation, due to the presence of naturally occurring radioactive material (NORM), have been investigated in this
