-
- دوشنبه تا شنبه: 10:00 - 16:00 / یکشنبه تعطیل است
Uranium-Molybdenum Dissolution Flowsheet Studies. Technical Report Pierce, R. The Super Kukla (SK) Prompt Burst Reactor operated at the Nevada Test Site from 1964 to 1978. The SK material is a uranium-molybdenum (U-Mo) alloy material of 90% U/10% Mo by weight at approximately 20% 235U enrichment. H-Canyon Engineering …
به خواندن ادامه دهید
@article{osti_5419359, title = {Heating of uranium oxides in a microwave oven}, author = {Haas, P A}, abstractNote = {The original objective of the tests was to dry samples of hydrated UO/sub 3/ gel spheres as part of a nuclear fuel preparation process. When exposed to microwave energy a hot spot will develop and grow until a 1- to 3-cm …
به خواندن ادامه دهید
@article{osti_1891914, title = {Flowsheet Design for the Purification of Mo-99 and Uranium Target Recovery by Solvent Extraction}, author = {Brown, M. Alex and Karslyan, Yana and Tkac, Peter}, abstractNote = {New production and purification methods are sought to meet the increasing demand of 99Mo but without the use of highly enriched …
به خواندن ادامه دهید
The main nuclide in radioactive wastewater is uranium, and there are generally thorium and radium [12,13]. Compared with other pollutants, radioactive pollutants have an extremely long half-life (e.g., the half-life of uranium-238 is about 4.5 billion years), higher concealment, more muscular toxicity, and can exist stably for a long time.
به خواندن ادامه دهید
Comparison of a simplified linear (left) and a circular (right) hydrometallurgical flowsheet for battery-grade cobalt and nickel production. For the circular process, a conceptual flowsheet is shown, with the re-introduction of protons to the system via hydrogen gas or via SX-assisted carbonation with CO 2.The acid is regenerated, and …
به خواندن ادامه دهید
The selection of a flowsheet for uranium recovery is largely dictated by the mineralogy and nature of the host rock, in particular its a cid consuming capacity . Leaching is commonly undertaken with
به خواندن ادامه دهید
Simplified flow chart of uranium ore processing from mining to the production of concentrate. These processes are commonly known as milling and the product – …
به خواندن ادامه دهید
@article{osti_6104596, title = {Chemical flowsheet conditions for preparing urania spheres by internal gelation}, author = {Haas, P A and Begovich, J M and Ryon, A D and Vavruska, J S}, abstractNote = {Small, ceramic urania spheres can be prepared for use as nuclear fuel by internal chemical gelation of uranyl nitrate solution droplets. . Decomposition of …
به خواندن ادامه دهید
The uranium concentration in loaded strip solution was 52.8 g L −1. Parameters of the process were determined, and the impact of Eluex process in underground leaching was also investigated. In industrial design, 95% of raffinate went back to elution and 5% back to ISL. No significant effect on uranium leaching or resin …
به خواندن ادامه دهید
@article{osti_972202, title = {EVALUATION OF FLOWSHEET CHANGES FOR THE HIGHLY ENRICHED URANIUM BLENDDOWN PROGRAM}, author = {Crowder, M and Rudisill, T and Laurinat, J and Mickalonis, J}, abstractNote = {H Canyon is considering a flowsheet change for Plutonium (Pu) Contaminated Scrap (PuCS) …
به خواندن ادامه دهید
Discovered in February 2008, the mine is currently the third largest uranium-only deposit in the world. It is located in the Namib Desert. The project received environmental clearance from the Namibian Ministry of Environment and Tourism in January 2011. By the end of 2011, it had obtained a mining license from the Ministry of Mines and …
به خواندن ادامه دهید
The high toxicity of soluble compounds of uranium (UF 6, UO 2 (NO 3) 2, UO 2 Cl 2, UO 2 F 2, uranyl-acetate, sulphates and carbonates) is largely manifested in kidney damage . Cadmium and lead are also the most hazardous heavy metals causing great health problems to humans and animal life through accumulation in several organs [ …
به خواندن ادامه دهید
The PUREX (Plutonium Uranium Reduction Extraction) process has been used in the last few decades for the recovery of U and Pu from the irradiated nuclear fuel. In PUREX process, U/Pu partition is achieved by the reduction of extractable Pu(IV) to inextractable Pu(III), U(IV) is the mostly used reducing agent, and always used with …
به خواندن ادامه دهید
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 uranium.
به خواندن ادامه دهید
The experimental data for this flowsheet [Citation 13] are used to validate the model. The flowsheet is summarized in Fig. 15, Tables 3 and 4. Aqueous Neptunium (V) is fed with nitric acid and uranium in stream F1, and stream F2 …
به خواندن ادامه دهید
Simplified flow chart of uranium ore processing from mining to the production of concentrate. These processes are commonly known as milling and the product – …
به خواندن ادامه دهید
Jin-Young Lee. Ho-Sung Yoon. Uranium solvent extraction (SX) from aqueous acidic solutions is reviewed. First the uranium availability in earth as well as resources, mining and production reports ...
به خواندن ادامه دهید
Uranium extraction technology. — Vienna : International Atomic Energy Agency, 1993. p. ; 24 cm. — (Technical reports series, ISSN 0074-1914 ; 359) STI/DOC/10/359 ISBN 92-0-103593-4 Includes bibliographical references. 1. In situ processing (Mining). 2. Leaching. 3. Solution mining. 4. Uranium mines and mining. I. International Atomic Energy ...
به خواندن ادامه دهید
In this the uranium and plutonium are back-extracted together in a first cycle of decontamination. They are then separated in a second cycle of solvent extraction and independent back-extraction . The factors affecting the choice of flowsheet type have been reviewed and criticality control is an important consideration in the process design.286...
به خواندن ادامه دهید
Chemistry of Purex (see flowsheet below). The used fuel is chopped up and dissolved in hot concentrated nitric acid. The first stage separates the uranium and plutonium in the aqueous nitric acid stream from the fission products and minor actinides by a countercurrent solvent extraction process, using tributyl phosphate dissolved in kerosene or dodecane.
به خواندن ادامه دهید
separate issue. A typical uranium acid leach flowsheet can be seen in Figure 1. The typical flowsheet comprises comminution to reduce the particle size to a size acceptable to the leach. A pre-concentration step could also be included where the ore is upgraded. The
به خواندن ادامه دهید
The new experimental flowsheet consisted of one-stage selective precipitation followed by two-stage solvent extraction that aimed to achieve enhanced separation of thorium, uranium and REEs. Both selective precipitation and solvent extraction tests were conducted at room temperature (approximately 25 °C), and DI water …
به خواندن ادامه دهید
Figure 1. Uranium ore-processing flowsheet. conducted in countercurrent thickener circuits. Both the thickener techniques and the flocculents developed for use in uranium …
به خواندن ادامه دهید
The co-extraction process flowsheet has been shown in Fig. 5. Uranium, plutonium, neptunium and technetium are recovered from the dissolved fuel using 30% TBP in n-dodecane. The extract (U, Tc, Np, and Pu) obtained from extraction/Scrub section is fed to Np/Pu-strip section where re-extraction of uranium and technetium is done using the …
به خواندن ادامه دهید
main component of the fuel recycling technology, uranium electrorefining, was demonstrated as part of the Experimental ... flowsheet is the use of electrochemical processes. These
به خواندن ادامه دهید
... the most commonly encountered flowsheet for uranium processing comprises conventional mining followed by comminution, acid leaching, solid/liquid separation, SX …
به خواندن ادامه دهید
The PUREX flowsheet was examined over two discrete flowsheets (Fig. S2, ESI†), the first consisted of a dual extraction of uranium and plutonium from non-active caesium with a scrub section, and the resultant heavy metal ion loaded solvent phase was fed into a second flowsheet to perform the stripping of uranium and plutonium.
به خواندن ادامه دهید
This conceptual process design was simulated using the software package OLI Flowsheet Version 9.6. The OLI Flowsheet is an electrolyte-based, steady-state process simulator. This software platform performs energy, mass, and species balances for industrial and research applications. ... Uranium oxide is the resulting product that …
به خواندن ادامه دهید
K. Irlweck. For analysing the isotopic composition of U, Th and Ra contents, amounts of 0.2—2 g of the rock materials or sediment samples are leached with half concentrated HN03 and the ...
به خواندن ادامه دهید
The vast majority of nuclear power reactors use the isotope uranium-235 as fuel; however, it only makes up 0.7% of the natural uranium mined and must therefore be increased through a process called enrichment. This increases the uranium-235 concentration from 0.7% to between 3% and 5%, which is the level used in most reactors.
به خواندن ادامه دهید