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MOX mixed powder pelleting method

A technology of mixing powder and particle size, applied in the field of granulation of MOX mixed powder, can solve the problems of uneven hardness of powder particles, hard particles, unqualified products of MOX pellets, etc., to improve the pass rate, processing effect and reliability. High performance to meet the needs of process stability and yield

Inactive Publication Date: 2020-04-17
THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the process of traditional MOX mixed powder granulation, manual feeding is mainly used, the granulation rolling pressure is not controlled, and the granulation method needs to be granulated many times. The powder particles obtained by granulating through this method Uneven hardness will lead to local occurrence of hard particles in the pellet microstructure after pellet sintering treatment, resulting in unqualified MOX pellet products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of granulation method of MOX mixed powder, described MOX mixed powder particle size is 15 μ m, comprises the following steps:

[0028] Step 1: Adjust the granulation parameters, control the feeding speed to 14.5rpm, the roll speed to 12.5rpm, and the crushing speed to 125rpm;

[0029] Step 2: Granulate the MOX mixed powder, control the feeding amount, and keep the granulation and rolling pressure at 40KN;

[0030] Step 3: After the granulation treatment is completed, the particle size distribution of the obtained powder is detected, and the particle size of 75% of the obtained powder is ≥100 μm.

Embodiment 2

[0032] A kind of granulation method of MOX mixed powder, described MOX mixed powder particle size is 8 μ m, comprises the following steps:

[0033] Step 1: Adjust the granulation parameters, control the feeding speed to 8rpm, the roll speed to 5rpm, and the crushing speed to 100rpm;

[0034] Step 2: Granulate the MOX mixed powder, control the feeding amount, and keep the granulation and rolling pressure at 25KN;

[0035] Step 3: After the granulation process is completed, the particle size distribution of the obtained powder is detected, and when 75% of the obtained powder particle size is ≥ 100 μm, follow-up processing is performed, otherwise the granulation operation is continued.

Embodiment 3

[0037] A kind of granulation method of MOX mixed powder, described MOX mixed powder particle size is 0.5 μ m, comprises the following steps:

[0038] Step 1: Adjust the granulation parameters, control the feeding speed to 3rpm, the roll speed to 2rpm, and the crushing speed to 85rpm;

[0039] Step 2: Granulate the MOX mixed powder, control the feeding amount, and keep the granulation and rolling pressure at 5KN;

[0040] Step 3: After the granulation process is completed, the particle size distribution of the obtained powder is detected, and when 75% of the obtained powder particle size is ≥ 100 μm, follow-up processing is performed, otherwise the granulation operation is continued.

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Abstract

The invention relates to the technical field of preparation of fuel pellets and particularly discloses an MOX mixed powder pelleting method. The method comprises the following steps that firstly, pelleting parameters are adjusted; secondly, pelleting is performed; and thirdly, the pellet sizes are detected. By means of the MOX mixed powder pelleting method provided by the invention, the problem oflocal hard pellets in a pellet metallographic microstructure is solved, the MOX mixed powder pelleting method is improved, and the MOX pellet product percent of pass is increased.

Description

technical field [0001] The invention belongs to the technical field of fuel pellet preparation, and in particular relates to a granulation method of MOX mixed powder. Background technique [0002] At present, in the process of traditional MOX mixed powder granulation, manual feeding is mainly used, the granulation rolling pressure is not controlled, and the granulation method needs to be granulated many times. The powder particles obtained by granulating through this method Uneven hardness will lead to local occurrence of hard particles in the pellet microstructure after pellet sintering treatment, resulting in unqualified MOX pellet products. [0003] In order to improve the microstructure distribution of pellets and reduce the generation of hard particles in the microstructure, it is urgent to improve the granulation method of MOX mixed powder. Contents of the invention [0004] The object of the present invention is to provide a kind of granulation method of MOX mixed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
CPCB22F9/04
Inventor 王军平屠振华谷磊郭亮刘雪峰张万德杨廷贵张顺孝朱桐宇刘鹏罗超谢斌姚海琴张武彪刘争张翔刘勇彭传洋祁磊张彦龙何敬德
Owner THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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