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Technologies for the treatment of effluents from uranium mines,
Processing highgrade uranium ore and managing the resulting effluents present unique problems for the operating personnel in the Athabasca Basin District in manganese2020年6月1日· The treatment for removal of radium from waters has been introduced at first in uranium mining and milling [21, 22] The purification of radium waters has beenModern technologies for radium removal from water –
Radium removal from uranium ores and mill tailings|INIS
A hydrochloric acid leaching method was used to extract both radium and uranium from the ore to yield tailings containing less radium than those produced by either conventionalA hydrochloric acid leaching method was used for extracting both radium and uranium from the ore to yield tailings containing less radium than tailings produced by eitherRadium Removal from Uranium Ores and Mill Tailings | National
Radium Removal from Uranium Mill Effluents with Inorganic Ion
Edward R Landa, Charles A Bush Geochemical hosts of solubilized radionuclides in uranium mill tailings Hydrometallurgy 1990, 24 (3) , 3613722023年9月8日· Uranium is a naturallyoccurring radioactive element that has been mined and used for its chemical properties for more than a thousand years It is now primarily used as fuel for nuclear reactors thatRadioactive Waste From Uranium Mining and Milling | US
Radium removal from uranium ores and mill tailings OSTIGOV
Alternatives to controlled storage of the tailings are (1) removal of the radium from the tailings for separate storage or use or (2) removal of the radium when processing the1984年5月1日· The addition of reducing agent has been found effective in the presence of complexing agents because it can convert some lowsolubility metal hydroxides to theirRadium in uranium mill tailings ScienceDirect
Radium removal from uranium ores (Journal Article) | ETDEWEB
Made available by US Department of Energy Office of Scientific and Technical Information2019年12月7日· In this work, a novel procedure was developed to separate thorium from uranium ore, consisting of leaching, liquid–liquid extraction, precipitations and ion exchange chromatography The final product was 9132 ± 077 mg of thorium with a purity of 995 ± 12 wt% Of that, 765 ± 010 mg was 230 Th and the remainder 232 ThSeparation of thorium from uranium ore | SpringerLink
Management of wastes from uranium mines and mills
residual uranium which also has a very long halflife (hundreds of millions of years), the tailings will remain radioactive for practically an indefinite period As at least 97% of the Ra226 fed to the mill remains undissolved through the leaching process, the concentration of radium in the tailings is only slightly less than that in the ore2020年3月2日· Uranium is a naturallyoccurring radioactive element that has been mined and used for its chemical properties for more than a thousand years It is now primarily used as fuel for nuclear reactors that make electricity Uranium can be recovered in two ways: by conventional mining of the rock (ore), or by using strong chemicals to dissolve uraniumRadioactive Waste From Uranium Mining and Milling | US EPA
Processes for extracting radium from uranium mill tailings
Alternatives to controlled storage of the tailings are (1) removal of the radium from the tailings for separate storage or use or (2) removal of the radium when processing the uranium ore In laboratory tests, radium was leached from tailings using either hydrochloric acid or ethylenediamine tetraacetic acid2013年1月15日· 1 Introduction Phosphogypsum (PG) is a hazardous waste associated with the phosphoric acid production using the wet process [1]PG is considered a relatively high level natural uranium series radionuclide material, which provokes a negative environmental impact and many restrictions on the use of the PG waste (only 15% of theTreatment of phosphogypsum waste produced from phosphate ore processing
EXTRACTION OF URANIUM FROM ITS ORES (Journal Article)
Leached solids with radium contents approaching 10 pCi/g (98% radium removal) were obtained after six stages of batch, crosscurrent leachingmore » On the basis of twostage tests on mill tailings, 05 M EDTA solutions at pH values of 82 to 116 were found to be more effective, while hydrochloric acid in two or threestage tests was less effective thanThe leaching of uranium ore and mill tailings to remove radium was studied A few scouting tests were performed to obtain data on the recovery of radium, Uranium ore was treated with soluble barium at concentrations of 10, 25, 50, and 100 mg per litre of slurry The leachliquor declined in /sup 226/Ra concentration by as much as 50%THE LEACHABILITY OF RADIUM226 FROM URANIUM MILL
Coextraction of uranium and radium from ore with ferric chloride
1983年6月1日· Abstract Ferric chloride leaching, at temperatures around 74°C, is found to remove up to remove up to 97% of the uranium from ores occurring in the Elliot Lake area of Canada Radium removal is poor due to the formation of sulphates from the sulphides present in the oreTests also showed that the hexametaphosphate interferes with uranium extraction from the ore and solubilizes thorium230 and radium226 from neutral residues left after acid leaching This approach was tested further, and 7080% removal of thorium and radium from the slimes (200 mesh) fraction of the tailings was achievedUse of phosphate compounds to extract thorium230 and radium
Uranium removal from a radioactive contaminated soil by
2021年11月8日· In order to assess the feasibility of uranium removal technology from radioactive contaminated soil by combined bioleaching bacterial consortia, mixed bacterial culture and pure culture of four strains (Acidithiobacillus ferrooxidans ATCC 23,270, Leptosirillum ferripHilum YSK, Acidithiobacills thiooxidans A01, Acidithiobacillus2001年1月1日· 3 It is possible to separate radium along with uranium and thorium from many uranium ores by leaching with 3 M HNO3 Since approximately 95% of the radium and 9899% of the uranium content of many uranium ores can be recovered by this means, serious consideration should be given to a nitric acid process for the recovery ofProblems in the separation of radium from uranium ore tailings
Leaching of radionuclides from uranium mill tailings and their
1983年8月1日· Problems in the separation of radium from uranium ore tailings Hydrometallurgy, 2: 249263 Skeaff, JM, 1981 Survey of the occurrence of Ra226 in the Rio Algom Quirke 1 uranium mill, Elliot Lake CIM Bull, 74(830): 115121 103 Silver, M and Anderson, JE, 1981 Removal of radium from Elliot Lake uranium tailings by salt1981年6月1日· Radium removal from uranium ores and mill tailings US Bureau of Mines, Rept of inv 8099 (1975) B Havlik et al Radium226 liberation from uranium ore processing mill waste solids and uranium rocks into surface streams — I Health Physics (1968) LJ Kosarek Radionuclide removal from waterAn investigation of radium extraction from uranium mill tailings
Radium in uranium mill tailings ScienceDirect
1984年5月1日· Uranium reserve estimates in ore deposits can be significantly impacted by 226 Ra/ 238 U disequilibria arising from the differential mobility of uranium and radium during groundwater transport 1D reactive transport models were developed to investigate the longterm effects of retention processes (UO 2(am) precipitation, U(VI) and Raradium in ores; (3) to simulate the conditions of an arid climate in order to study the possibility of leaching radium from tailings by rainwater 2 SUMMARY AND RECOMMENDATIONS Samples of representative uranium ore and mill tailings from New Mexico, tha Colorado Plateau, and Wyoming were collected and prepared for analysisNitric Acid Leaching of Radium and O^her Significant
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Felder uranium ore body near Three Rivers, Texas' Other wells in the south Texas area have been surveyed and a small Figure 1 shows that radium removal from this highly conWastes from the Mining and Milling of Uranium and Thorium Ores, a Code of Practice and Guide to the Code, IAEA Safety Series No 44 Radium removal 64 83 Monitoring 65 831 Impoundment facility monitoring 65 (230Th, 80 X 104 years) and radium (226Ra, 016 X 104 years) this radioactivityCurrent Practices and Options for Confinement of Uranium Mill
Uranium Recovery (Extraction) Methods | NRCgov
2023年1月1日· Uranium recovery involves one of the following extraction processes In a conventional uranium mine and mill, uranium ore is extracted from the Earth, typically through deep underground shafts or shallow open pits The ore is transported to a mill, where it is crushed and undergoes a chemical process to remove the uraniumAbstract Uranium ores, concentrates, calcines or tailings are processed to remove radium and thorium as well as uranium Selected ores, concentrates or tailings, or if more appropriate, chlorination calcines thereof, are leached by selected aqueous chlorinecontaining media (preferably in two stages) until uranium, radium and thoriumUranium ore processing (Patent) | OSTIGOV
Coextraction of uranium and radium from ore with ferric chloride
1983年6月1日· Ferric chloride leaching, at temperatures around 74°C, is found to remove up to remove up to 97% of the uranium from ores occurring in the Elliot Lake area of Canada Radium removal is poor due to the formation of sulphates from the sulphides present in the ore However, if the sulphides are removed initially by flotation, then ferric