Gas phase transfer method of natural uranium hexafluoride

A technology of gas phase transfer and UF6, which is applied in the field of gas phase transfer of natural UF6, can solve the problems of non-application and achieve the effect of ensuring product quality, high safety factor, and reducing the risk of liquid phase transfer

Active Publication Date: 2019-05-17
THE 404 CO LTD CHINA NAT NUCLEAR
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Problems solved by technology

To sum up, the purification and centralized treatment of the second and third stage condensers in the world mainly adopts the methods of condensation liquefaction and condensation solidification, and the use of gas phase transfer technology to assist the purification and transfer of UF6 products in cold traps has not yet been applied.

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  • Gas phase transfer method of natural uranium hexafluoride

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] At 101.325kPa, UF6 can sublimate directly without melting when heated to 56.4°C. Therefore, as long as the temperature of the auxiliary cold trap is controlled above the sublimation point, the gas phase transfer of UF6 can be realized. In addition, in the fluorine gas produced by medium-temperature electrolysis, the content of hydrogen fluoride is generally 4% to 10%, and this part of hydrogen fluoride will enter the product cold trap with the furnace gas, while the boiling point of hydrogen fluoride (19.5 ° C) and the sublimation point of UF6 (56.4°C) has a large difference, therefore, controlling the temperature of the auxiliary cold trap between the boiling point of hydrogen fluoride and the sublimation point of UF6 can effectively remove hydrogen fluoride in UF6. During the UF6 preparation process, most of the less volatile metal f...

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Abstract

The invention belongs to the technical field of natural uranium hexafluoride gas-phase transfer, in particular to a natural uranium hexafluoride gas-phase transfer system and a natural uranium hexafluoride gas-phase transfer method. A secondary condenser and a tertiary condenser are arranged above two electronic scales respectively, and ethylene glycol and steam serve as a cold medium and a heat medium respectively. The secondary condenser is provided with two outlets, one of the outlets is connected to an inlet of a primary condenser through a valve J1, and the other outlet is connected to an inlet of the tertiary condenser through a valve J2, a valve J3, a valve J4 and a valve J5. The tertiary condenser is provided with two outlets, one of the outlets is connected to the inlet of the primary condenser through the valve J5 and a valve J7, and the other outlet is connected to an external tail gas treatment process system through a valve J6 and a valve J8. By the system and the method, assistance in pressure-relieved purification and gas-phase transfer of UF6 products in a cold trap can be realized, purity of the natural UF6 products is improved, the metal direct recovery rate is increased, and safety risks in a transfer process are reduced.

Description

technical field [0001] The invention belongs to the technical field of gas phase transfer of natural uranium hexafluoride, and in particular relates to a gas phase transfer method of natural uranium hexafluoride. Background technique [0002] In the natural uranium conversion production process, in order to improve the capture efficiency of UF6, the second and third condensers are used as auxiliary cold traps. When the UF6 products in the auxiliary cold traps are captured to the specified value, the Perform purification and transfer. In the process of purification and transfer, UF6 vapor phase transfer is an important technology. [0003] Internationally, most of the UF6 products in the secondary and tertiary condensers used as auxiliary cold traps are transferred to corresponding product containers in liquid form. For example: the Cole conversion plant in the United States adopts the condensation solidification method, and uses the second and third condensers as auxiliary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D8/00C01G43/06
CPCB01D8/00C01G43/063
Inventor 魏刚张慧忠任喜彦陈建勇李子云何平李英锋陈俭刚陈阵李浩然
Owner THE 404 CO LTD CHINA NAT NUCLEAR
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