As an advanced dry head-end processing of spent fuel reprocessing, the oxidation-reduction volatilization technology will use for pulverizing uranium oxide ceramic pellets, decladding, and removal of most of volatile ...As an advanced dry head-end processing of spent fuel reprocessing, the oxidation-reduction volatilization technology will use for pulverizing uranium oxide ceramic pellets, decladding, and removal of most of volatile and semi-volatile fission elements, 3H, 14C, Kr, Xe, I, Cs, Ru and Tc, from fuel prior to main treatment process. The AIROX and ORIOX process, including circulation of oxidation in oxygen atmosphere and reduction in hydrogen atmosphere, researched on international at present, is considered to be the first choice for head-end processing.展开更多
As the novel ligands for the separation of trivalent actinides from lanthanides for spent nuclear fuel reprocessing,the amide-substituted 1,10-phenanthroline derivations were found to have high selectivity on Am(III) ...As the novel ligands for the separation of trivalent actinides from lanthanides for spent nuclear fuel reprocessing,the amide-substituted 1,10-phenanthroline derivations were found to have high selectivity on Am(III) and Eu(III) in nitric acid media[1;2]. However, the origin of their extraction abilities is still an open question.展开更多
If high level radioactive waste (HLW) is directly disposed in stable deep geological formations for long periods of time (some hundred thousand years), any release of which might take place in the future will pose no ...If high level radioactive waste (HLW) is directly disposed in stable deep geological formations for long periods of time (some hundred thousand years), any release of which might take place in the future will pose no significant health or environmental risk. Partitioning and transmutation (P&T) is the one of the most important strategies to reduce the long-term radiotoxicity of HLW[1].展开更多
Rare-earth (RE) elements in spent nuclear fuel are strong neutron absorbers, which affect the fission efficiencyof fissile materials. If some of these fission products (e.g., RE) can be removed by a thermo-mechanical ...Rare-earth (RE) elements in spent nuclear fuel are strong neutron absorbers, which affect the fission efficiencyof fissile materials. If some of these fission products (e.g., RE) can be removed by a thermo-mechanical process, itwill greatly improve the burn-up and economics of the recycled fuel in the DUPIC (Direct Use of spent PWR fuelin CANDU Reactors) concept[1;2]. In this work, the phase separation characteristics of the Nd (3%) element from(U1?xNdx)3O8 by high temperature oxidation was investigated in terms of the heat treatment temperature rangebetween 1 000 ?C and 1 700 ?C. The phase separation ratio (wt%) of Nd and U was evaluated using the XRD. Themorphology of the samples were obtained from SEM.展开更多
In this work, gas-phase chemistry of ruthenium and rhodium was studied using online isothermal chromatographyapparatus at low temperature coupled to the 252Cf SF source[1] at IMP (Fig. 1). Apart from the interferenceo...In this work, gas-phase chemistry of ruthenium and rhodium was studied using online isothermal chromatographyapparatus at low temperature coupled to the 252Cf SF source[1] at IMP (Fig. 1). Apart from the interferenceof precursor effect[2], 109?110Ru and 111?112Rh were chosen as the representative isotopes for the two elementsrespectively. An improved Monte Carlo molecular simulation program was compiled according to the gas-phasechemistry model[3], and was used in the optimization of the experimental condition. The adsorption enthalpies ofpentacarbonyl ruthenium and tetracarbonyl rhodium on the FEP surface were obtained.展开更多
The removal of radioactive actinide from rare earth products is an important task and key technology in the production of rare earth products.That is because element Actinium(Ac)and Lanthanum(La)belong to the same cla...The removal of radioactive actinide from rare earth products is an important task and key technology in the production of rare earth products.That is because element Actinium(Ac)and Lanthanum(La)belong to the same clan in the periodic table.展开更多
With the development of nuclear power,more and more spent nuclear fuel will be produced and accumulated.Reprocessing of these spent nuclear fuel became the key issues for the environmentally friendly and sustainable d...With the development of nuclear power,more and more spent nuclear fuel will be produced and accumulated.Reprocessing of these spent nuclear fuel became the key issues for the environmentally friendly and sustainable development of nuclear energy.展开更多
Actinium-225 is an-emitting radioisotope for the medical application in targeted alpha therapy(TAT).The production of Ac-225 can be produced via proton irradiation of the metal thorium target with^(232)Th(p,x)^(225)Ac...Actinium-225 is an-emitting radioisotope for the medical application in targeted alpha therapy(TAT).The production of Ac-225 can be produced via proton irradiation of the metal thorium target with^(232)Th(p,x)^(225)Ac reaction[1]in the high-current accelerator.展开更多
We describe herein an environmentally benign strategy for removing of fission products from spent nuclear fuel by the selective dissolution using carboxyl-functionalized ionic liquid[Hbet][Tf2N].Water-statured[Hbet][T...We describe herein an environmentally benign strategy for removing of fission products from spent nuclear fuel by the selective dissolution using carboxyl-functionalized ionic liquid[Hbet][Tf2N].Water-statured[Hbet][Tf2N]can dissolve lanthanides oxide from simulated spent nuclear fuel with a dissolution ratio of 100%at 40℃.However,the dissolution of uranium is almost neglect(<1%)under the same conditions.This process of separation displays an outstanding performance to separate some key fission products oxide such as neutron poisons Ln2O3 efficiently and allows the recovery of actinides AnO2 as a group in solid form.展开更多
Mononuclear Tc and Re carbonyls are the model compounds for the chemical characterization of Bh carbonyls at the single atom chemistry.Our preliminary experiments on the stoichiometry of Re carbonyls in the gas phase ...Mononuclear Tc and Re carbonyls are the model compounds for the chemical characterization of Bh carbonyls at the single atom chemistry.Our preliminary experiments on the stoichiometry of Re carbonyls in the gas phase deduced that the neutral and the cation species are Re(CO)5 and[Re(CO)6]+,respectively[1].We will report here a theoretical study to confirm their stoichiometry by quantum chemistry calculation.展开更多
文摘As an advanced dry head-end processing of spent fuel reprocessing, the oxidation-reduction volatilization technology will use for pulverizing uranium oxide ceramic pellets, decladding, and removal of most of volatile and semi-volatile fission elements, 3H, 14C, Kr, Xe, I, Cs, Ru and Tc, from fuel prior to main treatment process. The AIROX and ORIOX process, including circulation of oxidation in oxygen atmosphere and reduction in hydrogen atmosphere, researched on international at present, is considered to be the first choice for head-end processing.
文摘As the novel ligands for the separation of trivalent actinides from lanthanides for spent nuclear fuel reprocessing,the amide-substituted 1,10-phenanthroline derivations were found to have high selectivity on Am(III) and Eu(III) in nitric acid media[1;2]. However, the origin of their extraction abilities is still an open question.
文摘If high level radioactive waste (HLW) is directly disposed in stable deep geological formations for long periods of time (some hundred thousand years), any release of which might take place in the future will pose no significant health or environmental risk. Partitioning and transmutation (P&T) is the one of the most important strategies to reduce the long-term radiotoxicity of HLW[1].
文摘Rare-earth (RE) elements in spent nuclear fuel are strong neutron absorbers, which affect the fission efficiencyof fissile materials. If some of these fission products (e.g., RE) can be removed by a thermo-mechanical process, itwill greatly improve the burn-up and economics of the recycled fuel in the DUPIC (Direct Use of spent PWR fuelin CANDU Reactors) concept[1;2]. In this work, the phase separation characteristics of the Nd (3%) element from(U1?xNdx)3O8 by high temperature oxidation was investigated in terms of the heat treatment temperature rangebetween 1 000 ?C and 1 700 ?C. The phase separation ratio (wt%) of Nd and U was evaluated using the XRD. Themorphology of the samples were obtained from SEM.
文摘In this work, gas-phase chemistry of ruthenium and rhodium was studied using online isothermal chromatographyapparatus at low temperature coupled to the 252Cf SF source[1] at IMP (Fig. 1). Apart from the interferenceof precursor effect[2], 109?110Ru and 111?112Rh were chosen as the representative isotopes for the two elementsrespectively. An improved Monte Carlo molecular simulation program was compiled according to the gas-phasechemistry model[3], and was used in the optimization of the experimental condition. The adsorption enthalpies ofpentacarbonyl ruthenium and tetracarbonyl rhodium on the FEP surface were obtained.
文摘The removal of radioactive actinide from rare earth products is an important task and key technology in the production of rare earth products.That is because element Actinium(Ac)and Lanthanum(La)belong to the same clan in the periodic table.
文摘With the development of nuclear power,more and more spent nuclear fuel will be produced and accumulated.Reprocessing of these spent nuclear fuel became the key issues for the environmentally friendly and sustainable development of nuclear energy.
文摘Actinium-225 is an-emitting radioisotope for the medical application in targeted alpha therapy(TAT).The production of Ac-225 can be produced via proton irradiation of the metal thorium target with^(232)Th(p,x)^(225)Ac reaction[1]in the high-current accelerator.
文摘We describe herein an environmentally benign strategy for removing of fission products from spent nuclear fuel by the selective dissolution using carboxyl-functionalized ionic liquid[Hbet][Tf2N].Water-statured[Hbet][Tf2N]can dissolve lanthanides oxide from simulated spent nuclear fuel with a dissolution ratio of 100%at 40℃.However,the dissolution of uranium is almost neglect(<1%)under the same conditions.This process of separation displays an outstanding performance to separate some key fission products oxide such as neutron poisons Ln2O3 efficiently and allows the recovery of actinides AnO2 as a group in solid form.
文摘Mononuclear Tc and Re carbonyls are the model compounds for the chemical characterization of Bh carbonyls at the single atom chemistry.Our preliminary experiments on the stoichiometry of Re carbonyls in the gas phase deduced that the neutral and the cation species are Re(CO)5 and[Re(CO)6]+,respectively[1].We will report here a theoretical study to confirm their stoichiometry by quantum chemistry calculation.
