CN111063459B - MOX mixed particle treatment method - Google Patents
MOX mixed particle treatment method Download PDFInfo
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- CN111063459B CN111063459B CN201911299923.0A CN201911299923A CN111063459B CN 111063459 B CN111063459 B CN 111063459B CN 201911299923 A CN201911299923 A CN 201911299923A CN 111063459 B CN111063459 B CN 111063459B
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- mixed
- ball milling
- mox
- mixing
- treatment
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000002245 particle Substances 0.000 title claims abstract description 51
- 238000000498 ball milling Methods 0.000 claims abstract description 53
- 238000002156 mixing Methods 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000003756 stirring Methods 0.000 claims description 32
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 16
- 239000008187 granular material Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 2
- 230000003179 granulation Effects 0.000 claims description 2
- 239000008188 pellet Substances 0.000 abstract description 7
- 239000000446 fuel Substances 0.000 abstract description 5
- 238000012797 qualification Methods 0.000 abstract description 4
- 241000255969 Pieris brassicae Species 0.000 abstract description 3
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- 150000004706 metal oxides Chemical class 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000007873 sieving Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/42—Selection of substances for use as reactor fuel
- G21C3/58—Solid reactor fuel Pellets made of fissile material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
The invention relates to the technical field of preparation of nuclear-grade metal oxide particles, and particularly discloses a MOX mixed particle treatment method, which comprises the following steps: step one: ball milling treatment; step two: mixing; step three: granulating; step four: and (5) mixing and spheroidizing. The method solves the phenomenon of large white blocks in the microstructure of the pellets, realizes the improvement of the MOX mixed particle treatment method, and the MOX fuel particles obtained by adopting the method accord with the demand of developing materials of the MOX fuel pellets, thereby improving the qualification rate of MOX pellet products.
Description
Technical Field
The invention belongs to the technical field of preparation of nuclear-grade metal oxide particles, and particularly relates to a MOX mixed particle treatment method.
Background
At present, in the traditional MOX mixed particle treatment process, the MOX mixed particles are mainly treated by adopting the procedures of ball milling, mixing, granulating, mixing and spheroidizing. The early experimental result shows that the obvious large white block phenomenon often appears in the gold phase microstructure of the core block prepared by the traditional MOX mixed particle treatment method, and the reason for analyzing the phenomenon is that powder is unevenly mixed in the early powder treatment process, so that the MOX core block product is unqualified.
In order to solve the above problems, a new mixed particle treatment method is needed.
Disclosure of Invention
The invention aims to provide a MOX mixed particle treatment method for improving the qualification rate of MOX pellet products.
The technical scheme of the invention is as follows:
a method of MOX mixed particle treatment comprising the steps of:
step one: ball milling treatment
Dividing the total ball milling treatment time into a plurality of small cycles, respectively standing for a period of time after each small cycle is finished, opening a ball milling tank to check the state of the materials, and stirring the mixed materials in a manual intervention mode;
step two: mixing treatment
Screening MOX mixed particles obtained in the first step, adding zinc stearate, manually stirring and mixing, and adding into a three-dimensional mixer for mixing;
step three: granulating treatment
Transferring the mixed granules treated in the second step into a granulating process for granulating, wherein the pressure of a roller is controlled to be 10-20 kN in the granulating process;
step four: mixed spheroidization
Adding the mixed particles obtained in the third step into a spheroidizing tank, adding zinc stearate, manually stirring and mixing, and then adding the mixed particles into a three-dimensional mixer for mixing for 1.5-2 h; and detecting the apparent density and tap density of the particles by using an apparent density meter, stopping the mixed spheroidization when the two groups of data are in the required range, and otherwise, repeating the mixed spheroidization.
Dividing the total ball milling treatment time of 60min into 13 small cycles, performing ball milling treatment for 1min in the 1 st small cycle, standing for 5min, opening a ball milling tank to check the state of the materials, and stirring the mixed materials in a manual intervention mode;
after stirring uniformly, starting the 2 nd small cycle, performing ball milling treatment for 4min, then standing for 5min, opening a ball milling tank to check the state of the materials, and performing stirring treatment on the mixed materials in a manual intervention mode;
and then carrying out ball milling treatment for 5min in 11 small cycles, respectively standing for 5min, and stirring the mixed materials in a manual intervention mode.
In the first step, each small cycle is ball-milled at 350-600 rpm.
In the first step, the manual intervention mode is manual stirring operation.
In the second step, 0.05 to 0.10wt.% zinc stearate is added.
In the second step, the process parameters of 15-40 rpm and 1.5-2 h of mixing are adopted for mixing treatment.
In step three, the granulation is repeated three times to enhance the flowability of the granules.
And step four, adding the mixed particles obtained in the step three into a spheroidizing tank according to the filling rate of 40-60%.
In step four, 0.25wt.% zinc stearate is added.
In the fourth step, mixing is carried out at a rotation speed of 15-40 rpm.
The invention has the remarkable effects that:
(1) The method solves the phenomenon of large white blocks in the microstructure of the pellets, realizes the improvement of the MOX mixed particle treatment method, and the MOX fuel particles obtained by adopting the method accord with the demand of developing materials of the MOX fuel pellets, thereby improving the qualification rate of MOX pellet products.
(2) The method is also suitable for the treatment process of other nuclear-grade oxide mixed particles, has good treatment effect and high reliability, and meets the requirements of process stability and qualification rate.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
A method of MOX mixed particle treatment comprising the steps of:
step one: ball milling treatment
Dividing the total ball milling treatment time of 60min into 13 small cycles, performing ball milling treatment for 1min at the 1 st small cycle by adopting a rotating speed of 350-600 rpm, standing for 5min, opening a ball milling tank to check the state of the materials, and stirring the mixed materials in a manual intervention mode;
after stirring uniformly, starting the 2 nd small cycle, adopting a rotating speed of 350-600 rpm to perform ball milling treatment for 4min, then standing for 5min, opening a ball milling tank to check the state of the materials, and stirring the mixed materials in a manual intervention mode;
and then 11 small cycles are carried out at the rotating speed of 350-600 rpm for 5min, and the mixed materials are stirred by adopting a manual intervention mode after standing for 5min respectively.
Step two: mixing treatment
And (3) screening the MOX mixed particles obtained in the first step, adding 0.05-0.10 wt.% zinc stearate, manually stirring and mixing, adding the mixture into a three-dimensional mixer, and carrying out mixing treatment by adopting technological parameters of mixing at a rotating speed of 15-40 rpm for 1.5-2 h.
Step three: granulating treatment
And (3) transferring the mixed granules processed in the step (II) into a granulating process for granulating, wherein the pressure of a roller is controlled to be 10-20 kN in the granulating process, and the granules are re-granulated for three times to enhance the fluidity of the granules.
Step four: mixed spheroidization
Adding the mixed particles obtained in the step three into a spheroidizing tank according to the filling rate of 40-60%, adding 0.25wt.% zinc stearate, manually stirring and mixing, adding into a three-dimensional mixer, and mixing for 1.5-2 h at the rotating speed of 15-40 rpm; and detecting the apparent density and tap density of the particles by using an apparent density meter, stopping the mixed spheroidization when the two groups of data are in the required range, and otherwise, repeating the mixed spheroidization.
Example 1
A method of MOX mixed particle treatment comprising the steps of:
(1): the ball milling treatment, namely dividing the total time of the ball milling treatment into 13 small cycles, firstly adopting a rotating speed of 400rpm to perform ball milling treatment for 1min, standing for 5min, then opening a ball milling tank to check the state of the materials, and stirring the mixed materials in a manual stirring mode; after stirring uniformly, continuing to perform ball milling treatment for 4min at 400rpm, standing for 5min, opening a ball milling tank to check the state of the materials, and performing stirring treatment on the mixed materials in a manual intervention mode; and then ball milling is carried out in 11 small cycles by adopting a ball milling process with the rotating speed of 400rpm and the ball milling time of 5 min.
(2): and (3) mixing, namely adding 0.05wt.% zinc stearate into MOX mixed particles obtained in the first step after sieving, adding the mixed particles into a three-dimensional mixer after manual stirring and visual uniform mixing, and mixing for 2 hours by adopting the technological parameters of rotating speed of 25 rpm.
(3): and (3) granulating, namely transferring the mixed granules processed in the step (II) into a granulating process for granulating, wherein the pressure of a roller is controlled to be 10-20 kN in the granulating process, and the granules are duplicated for three times, so that the fluidity of the granules is enhanced.
(4): mixing and spheroidizing, namely adding the mixed particles obtained in the step three into a spheroidizing tank according to a filling rate of 40-60%, adding 0.25wt.% zinc stearate, primarily mixing, adding into a three-dimensional mixer, and mixing for 2 hours at a rotating speed of 25 rpm; and detecting the apparent density and tap density of the particles by using an apparent density meter, stopping the mixed spheroidization when the two groups of data are in the required range, and otherwise, repeating the mixed spheroidization.
The MOX fuel core block gold phase microstructure obtained by the process treatment method has no white block phenomenon, and is obviously improved compared with the traditional method.
Example two
A method of MOX mixed particle treatment comprising the steps of:
(1): the ball milling treatment, namely dividing the total time of the ball milling treatment into 13 small cycles, firstly adopting a rotating speed of 450rpm to perform the ball milling treatment for 1min, standing for 5min, then opening a ball milling tank to check the state of the materials, and adopting a manual intervention mode to stir the mixed materials. And (3) continuously adopting a rotating speed of 450rpm to perform ball milling treatment for 4min after uniform stirring, opening a ball milling tank to check the state of the materials after standing for 5min, and performing stirring treatment on the mixed materials by adopting a manual intervention mode. And then ball milling is carried out on 11 small cycles by adopting a ball milling process with the rotating speed of 450rpm and the ball milling time of 5 min.
(2): and (3) mixing, namely adding 0.05wt.% zinc stearate into the MOX mixed particles obtained in the first step after sieving, primarily mixing, and adding the mixture into a three-dimensional mixer, wherein the mixing is carried out by adopting technological parameters of mixing at 30rpm for 1.5 h.
(3): granulating, namely transferring the mixed granules processed in the step two into a granulating process to carry out granulating, wherein the pressure of a roller is controlled to be 10-20 kN in the granulating process.
(4): mixing and spheroidizing, namely adding the mixed particles obtained in the step three into a spheroidizing tank according to a filling rate of 40-60%, adding 0.25wt.% zinc stearate, primarily mixing, adding into a three-dimensional mixer, and mixing for 1.5h at a rotating speed of 30 rpm; and detecting the apparent density and tap density of the particles by using an apparent density meter, stopping the mixed spheroidization when the two groups of data are in the required range, and otherwise, repeating the mixed spheroidization.
Example III
A method of MOX mixed particle treatment comprising the steps of:
(1): the ball milling treatment, namely dividing the total time of the ball milling treatment into 13 small cycles, firstly adopting a rotating speed of 500rpm to perform the ball milling treatment for 1min, standing for 5min, then opening a ball milling tank to check the state of the materials, and adopting a manual intervention mode to stir the mixed materials. And (3) continuously adopting a 500rpm rotating speed to perform ball milling treatment for 4min after uniformly stirring, opening a ball milling tank to check the state of the materials after standing for 5min, and performing stirring treatment on the mixed materials by adopting a manual intervention mode. And then ball milling is carried out on 11 small cycles by adopting a ball milling process with the rotating speed of 500rpm and the ball milling time of 5 min.
(2): and (3) mixing, namely adding 0.10wt.% zinc stearate into the MOX mixed particles obtained in the first step after sieving, primarily mixing, and adding the mixture into a three-dimensional mixer, wherein the mixing is carried out by adopting technological parameters of mixing at 30rpm for 2 hours.
(3): granulating, namely transferring the mixed granules processed in the step two into a granulating process to carry out granulating, wherein the pressure of a roller is controlled to be 10-20 kN in the granulating process.
(4): mixing and spheroidizing, namely adding the mixed particles obtained in the step three into a spheroidizing tank according to a filling rate of 40-60%, adding 0.25wt.% zinc stearate, primarily mixing, adding into a three-dimensional mixer, and mixing for 2 hours at a rotating speed of 30 rpm; and detecting the apparent density and tap density of the particles by using an apparent density meter, stopping the mixed spheroidization when the two groups of data are in the required range, and otherwise, repeating the mixed spheroidization.
Claims (7)
1. A method for treating MOX mixed particles, which is characterized by comprising the following steps: the method comprises the following steps:
step one: ball milling treatment
Dividing the total ball milling treatment time into a plurality of small cycles, respectively standing for a period of time after each small cycle is finished, opening a ball milling tank to check the state of the materials, and stirring the mixed materials in a manual intervention mode;
step two: mixing treatment
Screening MOX mixed particles obtained in the first step, adding zinc stearate, manually stirring and mixing, and adding into a three-dimensional mixer for mixing;
step three: granulating treatment
Transferring the mixed granules treated in the second step into a granulating process for granulating, wherein the pressure of a roller is controlled to be 10-20 kN in the granulating process;
step four: mixed spheroidization
Adding the mixed particles obtained in the third step into a spheroidizing tank, adding zinc stearate, manually stirring and mixing, and then adding the mixed particles into a three-dimensional mixer for mixing for 1.5-2 hours; then detecting the apparent density and tap density of the particles by an apparent density meter, stopping the mixed spheroidization when the two groups of data are in the required range, otherwise, repeating the mixed spheroidization;
dividing the total ball milling treatment time of 60min into 13 small cycles, performing ball milling treatment for 1min in the 1 st small cycle, standing for 5min, opening a ball milling tank to check the state of the materials, and stirring the mixed materials in a manual intervention mode;
after stirring uniformly, starting the 2 nd small cycle, performing ball milling treatment for 4min, then standing for 5min, opening a ball milling tank to check the state of the materials, and performing stirring treatment on the mixed materials in a manual intervention mode;
then carrying out ball milling treatment for 5min in 11 small cycles, respectively standing for 5min, and stirring the mixed materials in a manual intervention mode;
each small cycle is ball-milled at a rotating speed of 350-600 rpm;
the manual intervention mode is manual stirring operation.
2. A method of MOX blend particle treatment according to claim 1, wherein: and in the second step, 0.05-0.10 wt.% of zinc stearate is added.
3. A method of MOX blend particle treatment according to claim 2, wherein: and in the second step, mixing treatment is carried out by adopting technological parameters of mixing for 1.5-2 hours at the rotating speed of 15-40 rpm.
4. A method of MOX blend particle treatment according to claim 1, wherein: in step three, the granulation is repeated three times to enhance the flowability of the granules.
5. A method of MOX blend particle treatment according to claim 1, wherein: and step four, adding the mixed particles obtained in the step three into a spheroidizing tank according to the filling rate of 40-60%.
6. The method for treating MOX mixed particles according to claim 5, wherein: in step four, 0.25wt.% zinc stearate is added.
7. The method for treating MOX mixed particles according to claim 6, wherein: and step four, mixing at a rotating speed of 15-40 rpm.
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| CN201911299923.0A CN111063459B (en) | 2019-12-17 | 2019-12-17 | MOX mixed particle treatment method |
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| CN201911299923.0A CN111063459B (en) | 2019-12-17 | 2019-12-17 | MOX mixed particle treatment method |
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| CN111063459A CN111063459A (en) | 2020-04-24 |
| CN111063459B true CN111063459B (en) | 2023-10-20 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3230280A (en) * | 1962-07-03 | 1966-01-18 | Atomic Energy Authority Uk | Process of producing spheroids of nuclear fuel materials by agglomeration |
| CN1890759A (en) * | 2003-10-06 | 2007-01-03 | 原子能委员会 | Method of producing pellets of a nuclear fuel based on mixed oxide (U,Pu)O2 or (U,Th)O2 |
| CN103345951A (en) * | 2013-06-21 | 2013-10-09 | 中国原子能科学研究院 | (U, np) O2transmutation fuel pellet and target preparation process |
| CN106521219A (en) * | 2017-01-05 | 2017-03-22 | 重庆大学 | Preparation method for TiC particle reinforced titanium-based porous material |
| CN107610796A (en) * | 2017-08-29 | 2018-01-19 | 中核四0四有限公司 | The unqualified Powder Recovery method of MOX preparation process |
| CN107761022A (en) * | 2017-09-28 | 2018-03-06 | 青海大学 | A kind of mixed phase enhancing magnesium-based composite material and preparation method thereof |
| CN107837760A (en) * | 2016-09-20 | 2018-03-27 | 中核四〇四有限公司 | A kind of MOX powder method of granulating |
| CN107837761A (en) * | 2016-09-20 | 2018-03-27 | 中核四〇四有限公司 | A kind of MOX powder rolls spheronization process |
-
2019
- 2019-12-17 CN CN201911299923.0A patent/CN111063459B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3230280A (en) * | 1962-07-03 | 1966-01-18 | Atomic Energy Authority Uk | Process of producing spheroids of nuclear fuel materials by agglomeration |
| CN1890759A (en) * | 2003-10-06 | 2007-01-03 | 原子能委员会 | Method of producing pellets of a nuclear fuel based on mixed oxide (U,Pu)O2 or (U,Th)O2 |
| CN103345951A (en) * | 2013-06-21 | 2013-10-09 | 中国原子能科学研究院 | (U, np) O2transmutation fuel pellet and target preparation process |
| CN107837760A (en) * | 2016-09-20 | 2018-03-27 | 中核四〇四有限公司 | A kind of MOX powder method of granulating |
| CN107837761A (en) * | 2016-09-20 | 2018-03-27 | 中核四〇四有限公司 | A kind of MOX powder rolls spheronization process |
| CN106521219A (en) * | 2017-01-05 | 2017-03-22 | 重庆大学 | Preparation method for TiC particle reinforced titanium-based porous material |
| CN107610796A (en) * | 2017-08-29 | 2018-01-19 | 中核四0四有限公司 | The unqualified Powder Recovery method of MOX preparation process |
| CN107761022A (en) * | 2017-09-28 | 2018-03-06 | 青海大学 | A kind of mixed phase enhancing magnesium-based composite material and preparation method thereof |
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