Oxide spent fuel dry aftertreatment-based novel molten salt system

A technology of spent fuel and oxides, which is applied in the direction of reactor fuel elements, reduction of greenhouse gas, nuclear power generation, etc., and can solve the problem that the recovery rate is difficult to reach satisfactory indicators, etc.

Active Publication Date: 2011-03-30
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the recovery rate of plutonium is still difficult to meet satisfactory targets

Method used

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  • Oxide spent fuel dry aftertreatment-based novel molten salt system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The reagents used in this example are as follows:

[0017] Lithium fluoride (analytical purity, Sinopharm Chemical Reagent Co., Ltd.), aluminum fluoride trihydrate (chemical purity, Sinopharm Chemical Reagent Co., Ltd.), lithium carbonate (analytical purity, Sinopharm Chemical Reagent Co., Ltd.), platinum wire (Φ1mm) , 99.9%, Alfa Aesar), uranium dioxide (Baotou Rare Earth Metallurgy Research Institute), graphite rods (6mm, three high graphite, Beijing Sanye Graphite Company).

[0018] Weigh 41g LiF and 42g AlF 3 , Weigh 3g Li 2 CO 3 . In this molten system, LiF and AlF 3 The molar ratio is 3.3:1, the flux salt Li 2 CO 3 The added amount is 3.6% of the total mass. Flux salt Li 2 CO 3 And excess LiF plays a role in fluxing to lower the melting point of the melt.

[0019] Mix the weighed salt evenly and place it in a graphite crucible, place the crucible in a quartz sleeve, and weigh about 6g of UO 2 The powder is added to the dried salt. Pour argon into the sleeve, adjust th...

Embodiment 2

[0021] The operation is as in Example 1. The dosage of each medicine is as follows:

[0022] LiF 36g and AlF 3 40g, Li 2 CO 3 0.08g. The amount of LiF added is 1.5 g.

Embodiment 3

[0024] The operation is as in Example 1. The dosage of each medicine is as follows:

[0025] LiF 36g and AlF 3 26.7g, Li 2 CO 3 3.1g. The added amount of LiF is 2.0 g.

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Abstract

The invention discloses a novel molten salt system used for dry aftertreatment of insoluble metal oxides. The system is a lithium fluoride-aluminum fluoride (LiF-AlF3) molten salt system, wherein assistant molten salt is lithium carbonate (Li2CO3); the molar ratio of the LiF to the AlF3 is 3 to 4.5:1; and the assistant molten salt is added in an amount which is 0.1 to 5 percent of the total weight of molten salt. In the system, F<-> is used as a buffering agent, and when the oxides are dissolved by the molten salt, the corrosion rate of related equipment caused by the F<-> is reduced to the industrially acceptable degree at the same time.

Description

Technical field [0001] The invention belongs to the technical field of non-aqueous reprocessing procedures for irradiated fuel assemblies, and specifically relates to a novel molten salt system for dry post-processing of insoluble metal oxides. Background technique [0002] Dry post-processing technology was developed by ANL in the United States and RIAR and RICT in Russia. Russia used a few kilograms of spent oxide fuel to carry out dry electrolysis post-processing, which proved that the technology is feasible in principle. The United States has also achieved success in the laboratory scale-up experiment for dry electrolysis of spent metal fuel. At present, the molten salt process is one of the four most active dry post-processing technologies. The principle of processing oxide ceramic components is to use complex anion salts with strong complexing properties for uranium and plutonium (such as Cl - , F - , SO 4 2- After melting, the spent oxide fuel is melted in the molten sal...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C25C3/34G21C19/48
CPCY02E30/30Y02W30/50
Inventor叶国安欧阳应根王长水刘利生常尚文常利何虎郭建华李瑞雪高巍高繁星
OwnerCHINA INSTITUTE OF ATOMIC ENERGY