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An integrated system for the adjustment and preparation of 2af and of material liquids in the post-treatment process

An integrated system and process flow technology, applied in the field of 2AF and OF material liquid adjustment and preparation integrated system, can solve the problems of inapplicable large-scale continuous processing, low utilization rate of nitrogen oxides, ineffective compatibility of modules, etc., to achieve convenient concentration The effect of automatic management, reduction of manpower, and improvement of overall lifespan

Active Publication Date: 2019-05-24
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the disadvantages of scattered processing modules, low utilization rate of nitrogen oxides, intermittent and discontinuous processes, and is not suitable for large-scale continuous processing.
At present, Chinese patent CN104328291B discloses "an oxidation price adjustment device for oxidizing Pu(Ⅲ) to Pu(Ⅳ)", Chinese patent CN204204437U discloses "a device for removing nitrous acid in post-treatment feed liquid", Chinese patent CN The Chinese patent of 103714876B "A method for removing nitrous acid" only introduces a single module in the published patent, and does not form an integrated system that conforms to the process flow, and there is a problem that the modules cannot be effectively compatible

Method used

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  • An integrated system for the adjustment and preparation of 2af and of material liquids in the post-treatment process
  • An integrated system for the adjustment and preparation of 2af and of material liquids in the post-treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The entire integrated system is as shown above, and its specific parameters are: the height of the oxidation column is 2000mm, the diameter is 120mm, the filler is Raschig ring (stainless steel material), the particle size is Ф8mm; the height of the degassing column is 4000mm, the diameter is 120mm, the filler Pall ring (stainless steel material) is used, the particle size is Ф8mm; the height of the washing column is 3000mm, the diameter is 150mm, the number is 1, the washing liquid is dilute nitric acid solution; the compressed air pressure is 0.2MPa.

[0037] Based on the established seasoning system, the simulated feed liquid price adjustment experiment was carried out to simulate the replacement of Pu(III) by Fe(II) in the Pu(III) feed liquid, and the feasibility study has been carried out.

[0038] Fe(II) simulated liquid composition: Fe(II) concentration 2g / L, hydrazine concentration 0.1mol / L, hydroxylamine concentration 0.1mol / L, nitric acid concentration 1.5mol / L...

Embodiment 2

[0045] The specific operation is the same as in Example 1, except that the specific parameters are as follows: the height of the oxidation column is 1300mm, the diameter is 60mm, the packing adopts Pall rings (stainless steel material), and the particle size is Ф6mm; 100mm, Raschig ring (stainless steel material) is used as filler, the particle size is Ф10mm; the height of scrubbing column is 2300mm, the diameter is 110mm, the quantity is 1, the washing liquid is dilute nitric acid solution; the compressed air pressure is 1MPa.

[0046] Based on the established seasoning system, the price adjustment experiment of OF simulated feed liquid was carried out, and Fe(II) was used to replace Pu(III) in simulated Pu(III) feed liquid. The feasibility study has been carried out.

[0047] Fe(II) simulated liquid composition: Fe(II) concentration 10g / L, hydrazine concentration 0.4mol / L, hydroxylamine concentration 0.6mol / L, nitric acid concentration 1mol / L, 60L in total.

[0048] Operatin...

Embodiment 3

[0054] The entire integrated system is as shown above, and its specific parameters are: the height of the oxidation column is 1580mm, the diameter is 120mm, the filler is Raschig ring (stainless steel material), the particle size is Ф8mm; the height of the degassing column is 4000mm, the diameter is 150mm, the filler Pall ring (stainless steel material) is used, the particle size is Ф10mm; the height of the washing column is 3000mm, the diameter is 150mm, the number is 1, the washing liquid is dilute nitric acid solution; the compressed air pressure is 0.2MPa.

[0055] Based on the established seasoning system, the simulated feed liquid price adjustment experiment was carried out to simulate the replacement of Pu(III) by Fe(II) in the Pu(III) feed liquid, and the feasibility study has been carried out.

[0056] Fe(II) simulated liquid composition: Fe(II) concentration 3g / L, hydrazine concentration 0.1mol / L, hydroxylamine concentration 0.1mol / L, nitric acid concentration 2.0mol / ...

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Abstract

The invention relates to the field of nuclear fuel reprocessing, and provides an integrated adjustment and preparation system for 2AF and OF feed liquid during a technological process of reprocessing. The integrated system includes a nitrogen oxide feeding system, a Pu (III) oxidation valence adjusting system, a nitrous acid removing system and a tail gas processing system. According to the integrated adjustment and preparation system for the 2AF and OF feed liquid during the technological process of reprocessing, a brand new N2O4 feeding mode is designed, and the integral cooperation design of processes, equipment size and material flowing modes among the nitrogen oxide feeding system, the Pu (III) oxidation valence adjusting system, the nitrous acid removing system and the tail gas processing system is completed; stable material supply for nitric oxides, Pu (III) oxidation valence adjustment, nitrous acid removal and consecutiveness and desalinization of a tail gas processing technology can be achieved; and the tail gas can meet an emission standard after the tail gas processing.

Description

technical field [0001] The invention relates to the field of nuclear fuel reprocessing, in particular to an integrated system for adjusting and preparing 2AF and OF material liquids in the reprocessing process Background technique [0002] In the field of nuclear industry, the Purex process is widely used as a classic nuclear fuel reprocessing process. The Purex process involves plutonium crude product liquid (1BP) to plutonium purification cycle raw material liquid (2AF), and plutonium product liquid (2BP) to plutonium precipitation The seasoning system of the former feed liquid (OF) and so on. In the process, reducing agents such as U(IV)-hydrazine, hydroxylamine-hydrazine or N,N-dimethylhydroxylamine-methylhydrazine are used to reduce and strip Pu(Ⅲ), and the plutonium in the 1BP feed solution obtained after the separation of uranium and plutonium is Trivalent, Pu(Ⅲ) needs to be oxidized to Pu(Ⅳ) before the next step of extraction-stripping to purify and concentrate plut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/06G21F9/20
CPCG21F9/06G21F9/20
Inventor 李高亮周贤明何辉唐洪彬常尚文兰天刘金平
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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