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Dry recycling technology for MOX fuel pellet waste

A fuel pellet, dry recovery technology, applied in nuclear engineering, radioactive purification and other directions, can solve the problem of not being applicable to MOX fuel pellet waste recycling, and achieve the effects of low cost, simple equipment and short recovery process flow

Active Publication Date: 2017-05-31
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve many defects in the wet recycling process of MOX fuel pellet waste, UO 2 The dry recovery process of waste fuel pellets cannot be applied to the recovery of waste MOX fuel pellets. The invention provides a dry recovery process of waste MOX fuel pellets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] will simulate MOX(UO 2 -20% CeO 2 ) pellets were calcined in air for 6 hours at a calcining temperature of 700°C. After cooling, use a disc crusher to crush once. The crushed recycled materials pass through a 18-mesh sieve, and the large particles left by the sieve are stored for the next crushing. Put the sifted powder into a 250ml cemented carbide ball mill tank, the ball-to-material ratio=3:1, and the charge ratio =1 / 2, using zirconia balls with a ball diameter of 7 mm, and performing ball milling on a planetary ball mill for 5 hours. The median particle size of the recovered simulated MOX powder is about 1.13 μm, which meets the recovery requirements, and the recovery rate is 98.8%.

Embodiment 2

[0027] will simulate MOX(UO 2 -20% CeO 2 ) pellets were calcined in air for 5 hours at a calcining temperature of 800°C. After cooling, use a disc crusher to crush once. The crushed recycled materials pass through a 18-mesh sieve, and the large particles left by the sieve are stored for the next crushing. Put the sieved powder into a 250ml cemented carbide ball mill tank, the ball-to-material ratio=4:1, and the charge ratio =2 / 3, using zirconia grinding balls with a ball diameter of 7 mm, and performing ball milling on a planetary ball mill for 11 hours. The median particle size of the recovered simulated MOX powder is about 1.08 μm, which meets the recovery requirements, and the recovery rate is 98.0%.

Embodiment 3

[0029] will simulate MOX(UO 2 -20% CeO 2 ) pellets were calcined in air for 4 hours at a calcining temperature of 900°C. After cooling, use a disc crusher to crush once. The crushed recycled materials pass through a 18-mesh sieve, and the large particles left by the sieve are stored for the next crushing. Put the sieved powder into a 250ml cemented carbide ball mill tank, the ball-to-material ratio=5:1, and the charge ratio =2 / 3, using zirconia grinding balls with a ball diameter of 7 mm, and performing ball milling on a planetary ball mill for 17 hours. The median particle size of the recovered simulated MOX powder is about 0.86 μm, which meets the recovery requirements, and the recovery rate is 97.5%.

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Abstract

The invention belongs to the field of nuclear fuel. In order to solve the problem that an MOX fuel pellet waste wet recycling technology has many defects, the invention provides a dry recycling technology for MOX fuel pellet waste. The technology comprises the following steps of 1, burning MOX fuel pellet waste; 2, crushing by using a crusher; 3, screening; 4, ball milling; and 5 recycling. According to the technology provided by the invention, powdering of the MOX fuel pellet waste is achieved by crushing-ball milling technologies, so that the technology is fundamentally different from a dry recycling technology for UO2 fuel pellet waste using an oxidized crushing technology. Practical application shows that the MOX fuel pellet waste wet recycling technology provided by the invention has the advantages of high recycling rate, short recycling technical process, high in speed, simple in equipment, low in cost, and being free from generating radioactive liquid waste, and can be recycled in an MOX combustion manufacturer; the recycled power has similar sintering performance with the common MOX raw material powder, and can be mixed with common raw materials for preparing MOX fuel pellets.

Description

technical field [0001] The invention belongs to the field of nuclear fuel, and in particular relates to a dry recovery process of MOX fuel pellet waste products. Background technique [0002] As a special kind of nuclear fuel, MOX fuel will inevitably produce 15-20% of unqualified pellet waste products during the manufacture of its pellets. If these waste pellets are not recycled, it will cause waste of nuclear materials and waste products. Problems such as inventory pressure and production line dosage seriously exceeded the standard, and even caused the production line to be shut down and paralyzed. [0003] At present, the recovery of waste MOX fuel pellets mainly adopts a wet process. In this process, nitric acid is used to dissolve the waste MOX fuel pellets, and after removing impurities, a mixed solution of uranyl nitrate and plutonium nitrate is obtained; then the uranium and plutonium are chemically separated to obtain High-purity plutonium nitrate solution; finally...

Claims

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Application Information

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IPC IPC(8): G21F9/28G21F9/30
CPCG21F9/28G21F9/30
Inventor 郑新海尹邦跃
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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