Use of flash sintering technique for the synthesis and densification of iodoapatites

An iodoapatite and rapid sintering technology, applied in radioactive purification, nuclear engineering and other directions, can solve problems such as unfavorable energy, time and cost burden, pollution, etc., and achieve the effect of eliminating the risk of diffusion and iodine volatilization

Active Publication Date: 2010-09-01
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES +3
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In this case, however, there are a total of two high-temperature steps, which is energetically unfavorable
Furthermore, the management of the chambers assigned to the synthesis, which are then contaminated with iodine, imposes a considerable burden on the method both in terms of time and costs

Method used

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  • Use of flash sintering technique for the synthesis and densification of iodoapatites
  • Use of flash sintering technique for the synthesis and densification of iodoapatites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0061] The chemical formula Pb is prepared in the following manner 10 (VO 4 ) 4.8 (PO 4 ) 1.2 I 2 of iodoapatite.

[0062] Preparation of lead vanadate phosphate / lead iodide mixture:

[0063] First, the composition Pb 3 (VO 4 ) 1.6 (PO 4 ) 0.4 lead vanadate phosphate.

[0064] The response is as follows:

[0065] 3PbO+0.8V 2 o 5 +0.4(NH 4 ) 2 HPO 4 →Pb 3 (VO 4 ) 1.6 (PO 4 ) 0.4 +0.6H 2 O+0.8NH 3 .

[0066] The lead vanadate phosphate thus obtained was then subjected to first grinding in ultrapure water (solids / water weight ratio=1) using a planetary mill equipped with a cylinder made of tungsten carbide and ball. This milling was performed for 1 hour at a speed of 300 rpm.

[0067] Next, the lead vanadate phosphate was subjected to a second milling in water. At 750cm made of zirconia 3 The milling was carried out in a cylinder with a powder / ball weight ratio equal to 1 / 9 (weight of powder = 100 g) and using as milling media a medium consisting of z...

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Abstract

The invention relates to the use of a so-called flash-sintering technique for the synthesis and densification of iodine apatites or iodoapatites. The invention can be used in the recycling of used nuclear fuel for conditioning and storing into apatite the radioactive iodine present in the aqueous effluents from said recycling, in particular iodine 129.

Description

technical field [0001] The present invention relates to the use of the process known as "rapid sintering", also abbreviated SPS (Spark Plasma Sintering) and FAST (Field Activated Sintering Technology) for the synthesis and densification (or densification) of iodine apatites. ) or iodoapatites. [0002] The invention notably finds application in the field of reprocessing (or reprocessing) of spent nuclear fuel, where it can be used to condition and store in apatite the radioactive iodine present in the aqueous effluent produced during this reprocessing , especially iodine-129. Background technique [0003] Iodine is a fission product present in spent nuclear fuel, and its 129 isotope has a half-life of 15.7 million years. [0004] Considering its radiotoxicity in humans, which is closely linked to its affinity for the thyroid gland (where it accumulates), some research has been done in recent years on the regulation and storage of iodine in durable matrices The substrate i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/447C04B35/495C04B35/645G21F9/30
CPCC04B2235/3239C04B2235/3296G21F9/30C04B2235/444C04B2235/3284C04B35/645C04B2235/666G21F9/302C04B2235/77C04B35/495C04B2235/447C04B35/447C04B35/497
Inventor 利昂内尔·坎帕约索菲·勒加莱弗洛伦斯·巴尔特弗雷德里克·伯纳德尤里·格里恩
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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