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Use of Microwave Radiation for Denitration of Uranyl Nitrate …

Abstract Fabrication of ceramic UO2 fuel pellets using microwave radiation was studied. The UO2 powder was prepared by microwave denitration of a nitric acid …

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UO2 Ceramic Grade Powders Prepared by Direct Microwave …

In this paper, the denitration process was studied by depressing the pressure inside the vessel where the solution is denitrated. Intermediate and final …

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Applications of microwaves in nuclear chemistry and …

In the process, a uniform denitrated product of U 3 O 8 could be obtained by microwave heating from HEU. When the denitration temperature was controlled at …

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Nuclear Engineering and Design

MicroWave Direct Denitration (MWDD) technique has been developed for recycling of CRO. The powder prepared by dry and wet (MWDD) recycling techniques was characterized by XRD and

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CHINA NUCLEAR SCIENCE AND TECHNOLOGY REPORT

Microwave assisted thermal denitration process has obvious advantages for the con-version of HEU nitrate. The principle and the process equipment have been tentatively …

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Quartz Vessel Containing Plasma | Download Scientific …

Download scientific diagram | Quartz Vessel Containing Plasma from publication: ATMOSPHERIC PRESSURE PLASMA MICROWAVE PROCESSING | In 1998, Dana Corporation began developmental work in the field ...

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Microwave-assisted sample preparation of Hungarian raw …

By using a smaller vessel the aforementioned problem can be improved. Single Reaction Chamber technology allows digestion of samples in small amounts in digestion vials [21, 22]. A sample also can be digested in mini PTFE vessels by microwave-assisted digestion [23] or quartz tubes placed inside a holder within a …

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Microwave power and temperature profile during denitration…

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Development of recycling processes for clean rejected MOX …

Denitration process vessel: Three types of quartz process vessels (1 l each) namely dish shaped, wide neck and narrow neck beakers were taken for MicroWave Direct Denitration experiments. 3. Jaw crusher: The feed material was passed through …

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UO 2 Ceramic Grade Powders Prepared by Direct Microwave Denitration …

Based on the successful development of the co-conversion process, the microwave heating direct denitration facility with a 10 kg MOX/d capacity has been constructed adjacent to the reprocessing plant.

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(PDF) An Integrated Process for Recycling of ThO2 Based …

The integrated process was developed by combining three basic ap- proaches of recycling namely mechanical micronisation, air oxidation (for MOX) and microwave dissolution-denitration.

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UO2 Ceramic Grade Powders Prepared by Direct Microwave Denitration …

In this paper, the denitration process was studied by depressing the pressure inside the vessel where the solution is denitrated. Intermediate and final products were characterized. It was demonstrated that when working pressure ranges between 520 and 970 hPa during denitration, high density UO 2 pellets can be obtained without …

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Microwave direct denitration for synthesis of Cu-Ce-Zr-O …

In our previous study, complex oxides were synthesized from an aqueous solution of metal nitrate hydrates by microwave direct denitration (MDD) [22].In addition, the specific surface areas of complex oxides synthesized by MDD were reported to exceed those of complex oxides synthesized by other methods [23].This was due to …

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Fluoropolymers for digestion vessels

Digestion vessels or pressure digestion vessels are one of the core components of modern microwave digestion systems in sample preparation and must meet a number of requirements. Microwave transparency ->In order to ensure a fast in situ infrared temperature measurement without delay, there must be no material between the sensor …

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Apparatus for continuously concentrating and denitrating nitrate

An apparatus for continuously concentrating and denitrating a radioactive nitrate solution by microwave includes a rotatably supported concentrating and denitrating vessel disposed within an oven into ... Denitration systems: : Matsumaru et al. 422/159: 4439402: Nuclear fuel conversion systems: :

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Research on plasma modified fly ash denitration

The effects of reactor parameters and process parameters on the denitration rate of modified fly ash in different gas atmospheres were studied by using a dielectric barrier plasma reactor and ...

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(PDF) Use of Microwave Radiation for Denitration …

Ground-in quartz stoppers were ... [∼270 g (Pu + U)/ℓ] is fed into a denitration vessel placed in a fixed position on the denitration apparatus. ... the co-conversion process using a microwave ...

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UO2 Ceramic Grade Powders Prepared by Direct Microwave Denitration …

In this paper, the denitration process was studied by depressing the pressure inside the vessel where the solution is denitrated. Intermediate and final products were characterized. It was demonstrated that when working pressure ranges between 520 and 970 hPa during denitration, high density UO2 pellets can be obtained without …

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quartz microwave denitration process vessel

Contribute to dinglei2022/en development by creating an account on GitHub.

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Synthesis of Mixed Actinide Oxides Using Microwave …

A method has been developed for producing mixed actinide oxides suitable for fabricating mixed nitride uranium plutonium fuel for fast neutron reactors. The method is based on the use of microwave radiation for the direct denitration of actinide nitrate solutions. The possibility of producing uranium, plutonium, and neptunium-mixed oxides …

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The research for applying microwave denitration on the conversion …

Made available by U.S. Department of Energy Office of Scientific and Technical Information ...

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US4563335A

US4563335A US06/563,613 US56361383A US4563335A US 4563335 A US4563335 A US 4563335A US 56361383 A US56361383 A US 56361383A US 4563335 A US4563335 A US 4563335A Authority US United States Prior art keywords vessel denitrating concentrating nitrate solution compartments Prior art date Legal status (The …

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Development of a Process for Co-Conversion of Pu-U …

Vol. 20, No. 7 (July 1983) REVIEW (M. Koizumi ei al.) 531 denitration apparatus scralching olf llle denilraled calciiialioii - I educlion ball Illill MOX from tile vessel furnace Fig. 1 Flow …

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Microwave-assisted digestion in closed vessels: …

A microwave oven (Multiwave 3000 microwave sample preparation system, Anton Paar, Graz, Austria) equipped with 8 high-pressure quartz vessels was used in the experiments. The internal volume of vessels …

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Synthesis of Mixed Actinide Oxides Using Microwave …

The plutonium content was analyzed by the α-radiometric method. Energies 2022, 15, 6618 4 of 9 Figure 1. Scheme of the laboratory microwave denitration unit in the glove box. 2.2. Mixed U and Ce Oxides Produced in a Microwave Denitration Pilot Unit To study the scaling effect, a mock-up of the microwave denitration pilot unit was created.

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Scheme of an installation for denitration of nitric acid …

Download scientific diagram | Scheme of an installation for denitration of nitric acid uranium solutions under the action of UHF radiation: (1) cylinder with the Ar + 10 vol % Н 2 gas mixture, (2 ...

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Use of Microwave Radiation for Denitration of Uranyl …

UO2 powder was prepared by microwave irradiation of a UO2(NO3)2 solution containing 400 g L–1 U. A 500-mL quartz fl ask containing 250 mL of the UO2(NO3)2 solution was placed in the chamber of a Samsung MW73VR microwave oven (radiation frequency 2.45 GHz, magnetron power up to 800 W) onto a heat-protecting support made of a light fi …

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Synthesis of Mixed Actinide Oxides Using Microwave …

microwave denitration process of the uranyl nitrate solution. In Proceedings of the Third International Conference on Nuclear Fuel Reprocessing and W aste Management, RECOD'91(II), Sendai, Japan ...

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(PDF) An Integrated Process for Recycling of ThO2 Based …

The XRD pattern of denitrated ThO2 in Figure 5(b) indicates that the microwave denitration of thorium nitrate give well developed crystalline thoria. However, the peaks are broader than the sintered ThO2. The calcination was carried out after microwave denitration (Figure 1) to remove residual volatiles (nitrate, water etc.).