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Device for oxidized adjusting plutonium valence by N2O4

A valence state, oxidation column technology, applied in the direction of reactor fuel elements, reactors, greenhouse gas reduction, etc., can solve the problem of reduced utilization

Active Publication Date: 2012-04-11
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

It has been shown that liquid N 2 o 4 Can be used to adjust the valence state of plutonium by oxidation, but in the process liquid N 2 o 4 Reacting with the reducing agent in the system will generate a large amount of nitrogen oxide gas to escape, causing N 2 o 4 At the same time, there is still a certain amount of nitrous acid (about 0.1mol / L) in the feed liquid after the price adjustment is completed. Before the subsequent plutonium purification process and plutonium oxalate precipitation process, it is usually necessary to drive out the nitrous acid in the system. Divide to below 0.01mol / L
At present, the methods of removing nitrous acid in this link are mainly stirring method or air bubbling method, both of which are batch operations, and there are no reports in the literature on the device that realizes continuous operation with the plutonium oxidation price adjustment process

Method used

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  • Device for oxidized adjusting plutonium valence by N2O4

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Embodiment Construction

[0010] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0011] figure 1 It is the seasoning device provided by this embodiment. Among them, the Pu(III) oxidation column (2) is made of nitric acid corrosion-resistant materials such as glass or stainless steel, with a height of 400mm and a diameter of 20mm, and an inert ceramic ball filler with a diameter of 2mm is placed inside. bottom with liquid N 2 o 4 Inlet (3) and 1BP feed liquid inlet (4), wherein liquid N 2 o 4 The inlet (3) is located 10 mm above the 1BP feed liquid inlet (4). The feed liquid outlet at the upper end is 200mm in length, and the feed liquid delivery pipe (8) with a diameter of 4mm is connected with the nitrous acid removal column (9). Nitrous acid is driven out column (9) material is nitric acid corrosion resistant material such as glass or stainless steel, and height is 600mm, and diameter is 30mm, and the bott...

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Abstract

The invention discloses a device for oxidized adjusting plutonium valence by N2O4, comprising a Pu (III) oxidized column and a nitrous acid eliminating column, wherein the Pu (III) oxidized column and the nitrous acid eliminating column are connected via a material fluid transporting pipe. The device provided by the invention increases the utilization rate of the N2O4, reduces the escaped nitric oxide and realizes the continuous operation of the plutonium valence adjusting process and the remaining nitrous acid eliminating process.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel reprocessing, and in particular relates to a seasoning device for 1BP to 2AF in the Purex process of nuclear fuel reprocessing. Background technique [0002] The advanced reprocessing separation process currently being studied - APOR process (Advanced Purex Processbased on Organic Reductants), uses a new reductant N,N-dimethylhydroxylamine-methylhydrazine in the 1B uranium-plutonium separation section to reduce and strip Pu( III), and achieved better results. The plutonium in the 1BP feed solution obtained after the separation of uranium and plutonium is trivalent. Before the next step of purifying and enriching plutonium through extraction-stripping, plutonium (III) needs to be adjusted to plutonium (IV). The plutonium nitrate obtained from the plutonium purification cycle (III) The solution also needs to be converted into plutonium(IV) during the precipitation conversion step, and at the s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C19/38
CPCY02E30/30
Inventor 李高亮何辉郑卫芳李会蓉唐洪彬叶国安兰天张虎罗方祥
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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