Method for ball milling of MOX mixed powder

A technology of mixing powder and processing method, applied in the field of nuclear-grade metal oxide powder preparation, can solve the problem of uneven mixing of MOX powder, and achieve the effects of satisfying process stability and qualification rate, high reliability, and uniform microstructure distribution.

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

[0006] The object of the present invention is to provide a ball milling treatment method for MOX mixed powder to solve the problem of uneven mixing of MOX powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A ball milling treatment method for MOX mixed powder, the particle size of the MOX mixed powder is 8.5 μm, and the specific surface area is 7.2m 2 / g, including the following steps:

[0032] (1) Add 0.97kg of MOX mixed powder into the ball milling tank, and add grinding balls according to the ratio of ball to material ratio of 1:1, the filling rate of the ball milling tank is 47%;

[0033] (2) ball milling with a rotating speed of 870rpm for 10 minutes;

[0034] (3) After standing for 3 minutes, open the ball mill tank, scrape off the powder on the inner wall of the tank with a spatula, stir up the bottom material with a stirring tool, and slowly stir the material to make it evenly mixed;

[0035] (4) Step (2) and step (3) are repeated, wherein the ball milling speed is controlled to be 450rpm;

[0036] (5) After 20 cycles of treatment, the ball milling is over, and the particle size of the powder after ball milling is 1.2 μm, and the specific surface area is 14.8 m ...

Embodiment 2

[0038] A ball milling treatment method for MOX mixed powder, the particle size of the MOX mixed powder is 6.9 μm, and the specific surface area is 9.8m 2 / g, including the following steps:

[0039] (1) Add 0.84kg of MOX mixed powder into the ball milling tank, and add grinding balls according to the ratio of ball to material ratio of 1:1, the filling rate of the ball milling tank is 42%;

[0040] (2) ball milling with a rotating speed of 900rpm for 10 minutes;

[0041] (3) After standing for 3 minutes, open the ball mill tank, scrape off the powder on the inner wall of the tank, stir up the bottom material with a stirring tool, and slowly stir the material to make it evenly mixed;

[0042] (4) Step (2) and step (3) are repeated, wherein the ball milling speed is controlled to be 450rpm;

[0043] (5) After 20 cycles of treatment, the ball milling is over, and the particle size of the powder after ball milling is 2.4 μm, and the specific surface area is 12.8 m 2 / g, in line w...

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Abstract

The invention relates to the technical field of preparation of nuclear-grade metal oxide powder, and particularly discloses a method for ball milling of MOX mixed powder. The method comprises the following steps: (1) respectively adding MOX mixed powder and a grinding ball into a ball milling tank; (2) setting the rotating speed less than 1000 rpm and time less than or equal to 10 min of each timeof ball milling, and starting ball milling; (3) opening the ball milling tank after the primary ball milling is finished, scraping powder on the inner wall of the tank, stirring materials at the bottom of the ball milling tank, and slowly stirring the materials to uniformly mix; (4) after the materials are fully and uniformly mixed, repeating the steps (2)-(3) until the predicted particle size ofthe powder reaches the actual target requirement, and stopping ball milling; and (5) checking the particle size of the powder, and entering the next process if the particle size meets the actual target requirement; and if not, continuing ball milling. The method solves the problem of uneven mixing of the MOX powder, the ball milling treatment method of the MOX mixed powder is improved, and the qualification rate of MOX pellet products is improved.

Description

technical field [0001] The invention belongs to the technical field of nuclear-grade metal oxide powder preparation, and in particular relates to a ball milling treatment method for MOX mixed powder. Background technique [0002] At present, in the traditional ball milling process of MOX mixed powder, the one-step ball milling method is mainly used, that is, the powder is put into the ball milling device, and after a long time of ball milling, it enters the next process for processing. There are following two shortcomings in this method: [0003] 1. Long-term ball milling will cause the temperature of the powder and the tank to rise, and the powder will coalesce or attach to the ball and the wall due to the charge. This will not only reduce the efficiency of ball milling, but also cause certain difficulties in the recovery of materials. ; [0004] 2. After a period of time of ball milling, the materials and balls are deposited on the bottom of the ball mill tank. As the te...

Claims

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Application Information

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IPC IPC(8): B02C17/10
CPCB02C17/10
Inventor 张翔杨廷贵罗超朱桐宇张顺孝屠振华张万德郭亮王斌谢斌刘雪峰孙世亮陈元林刘勇彭传洋祁磊张彦龙王军平杨欢欢
Owner THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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