CN107845433B - A kind of MOX powder forming agent and lubricant adding method - Google Patents
A kind of MOX powder forming agent and lubricant adding method Download PDFInfo
- Publication number
- CN107845433B CN107845433B CN201610834813.XA CN201610834813A CN107845433B CN 107845433 B CN107845433 B CN 107845433B CN 201610834813 A CN201610834813 A CN 201610834813A CN 107845433 B CN107845433 B CN 107845433B
- Authority
- CN
- China
- Prior art keywords
- particle
- mox
- zinc stearate
- speed
- forming agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000314 lubricant Substances 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 title claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 37
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000000498 cooling water Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 238000012216 screening Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical group [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 3
- 239000008116 calcium stearate Substances 0.000 claims description 3
- 235000013539 calcium stearate Nutrition 0.000 claims description 3
- 235000021588 free fatty acids Nutrition 0.000 claims description 3
- FSWZDJUNHJMBSQ-UHFFFAOYSA-N lithium;octadecanoic acid Chemical group [Li].CCCCCCCCCCCCCCCCCC(O)=O FSWZDJUNHJMBSQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 description 5
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000002269 spontaneous 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
- G21C3/62—Ceramic fuel
- G21C3/623—Oxide fuels
-
- 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
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Powder Metallurgy (AREA)
- Lubricants (AREA)
Abstract
A kind of MOX powder forming agent and lubricant adding method, comprising the following steps: step 1: zinc stearate is chosen；Step 2: drying 0.5~3h for zinc stearate particle under conditions of 15~40 DEG C, 0.01~0.5Pa of vacuum degree, remove volatile impurity element therein, and the excessively high caused particle of temperature is avoided to increase phenomenon and fusing extremely；Step 3: screening process is carried out to the zinc stearate particle handled through step 2 with the sieve of 20~100 mesh；Step 4: required MOX grain amount is calculated with 15~35% filling rate and is added in ball grinder, the zinc stearate particle handled through step 3 is added in MOX particle with 0.02~5.0% weight ratio, 15~38 DEG C of cooling water is passed through with the speed of 5~15L/min, it avoids reuniting and melting phenomenon step 5 caused by generating heat because of material: mixing 5~45min with the speed of 1~10r/min, it is uniformly mixed zinc stearate particle and MOX particle tentatively, then batch mixer revolving speed is incrementally increased with the speed of 1~20r/min, 15~600min of mixed processing under the speed of 10~100r/min, avoid MOX Particle Breakage caused by being vigorously mixed.
Description
Technical field
The technology belongs to binder and lubricant and adds field, and in particular to a kind of MOX powder forming agent adds with lubricant
Adding method.
Background technique
MOX powder is tiny, and mobility is poor, while MOX pellet size is tiny, and contains centre bore and chamfering structure, because
This, the Density Distribution of friction, improvement green compact when in order to reduce molding between powder particle and mold wall and mill punching reduces pressing mold mill
It damages and is conducive to demould, binder and lubricant should be added.
Currently, the powder forming agent of traditional industries and lubricant adding technique are primarily present 5 points of deficiencies, first is that MOX material
The spontaneous fever of meeting, and traditional binder is easy fusing when heated；Second is that MOX material fluidity is poor, be added it is traditional at
It is easy to cause material apparent density and mobility to be obviously deteriorated when shape agent, has an adverse effect to sintering bulk properties；Third is that MOX object
The nuclear properties of material, do not allow binder to be added with solution state；Fourth is that traditional lubricant adding technique is to be applied to lubricant
On mould inner wall and pressure head, it is contemplated that the mode of the radioactive nature of MOX powder, this artificial smearing lubricant not only will increase people
Member by irradiation time, while can also reduce production efficiency；Fifth is that unreasonable phenomena such as the leading to MOX Particle Breakage hair of parameter setting
It is raw, influence the mobility and compressibility of material.
Summary of the invention
It is an object of the invention to: a kind of MOX powder forming agent and lubricant adding method are devised, it is suitable by selecting
Binder, using powder lubrication by the way of, improve compact strength, improve pellet manufacture reliability.
Technical scheme is as follows: a kind of MOX powder forming agent and lubricant adding method, comprising the following steps:
Step 1: zinc stearate is chosen, wherein metal Zn content 10~11.2% in zinc stearate, free fatty acid is less than
0.5%, water content is less than 0.5%, 20~200 mesh of granularity, chooses MOX particle, and granularity is 185~500 μm, specific surface area 3
~18m2/ g, impurity content are 250~2600 μ g/g, and apparent density is 15~20%TD, and filling rate is 78~80%, Carr stream
Dynamic sex index 51~65,41~48%TD of compact density；
Step 2: drying 0.5~3h for zinc stearate particle under conditions of 15~40 DEG C, 0.01~0.5Pa of vacuum degree,
Volatile impurity element therein is removed, and the excessively high caused particle of temperature is avoided to increase phenomenon and fusing extremely；
Step 3: screening process is carried out to the zinc stearate particle handled through step 2 with the sieve of 20~100 mesh；
Step 4: calculating required MOX grain amount with 15~35% filling rate and be added in ball grinder, will be through step
The zinc stearate particle of three processing is added in MOX particle with 0.02~5.0% weight ratio, logical with the speed of 5~15L/min
The cooling water for entering 15~38 DEG C avoids reunion and melting phenomenon caused by generating heat because of material
Step 5: 5~45min is mixed with the speed of 1~10r/min, mixes zinc stearate particle and MOX particle tentatively
Uniformly, batch mixer revolving speed is then incrementally increased with the speed of 1~20r/min, the mixed processing under the speed of 10~100r/min
15~600min avoids MOX Particle Breakage caused by being vigorously mixed.
Further include step 6: with the speed of 1~10r/min gradually reduce batch mixer revolving speed until stop, stop mixing 5~
After 30min, cooling water is closed.
In the step 1, zinc stearate can be replaced with calcium stearate or stearic acid lithium.
Remarkable result of the invention is: having preferable caking property and greasy property, is easy uniformly to divide in mixed-powder
It dissipates, and chemical change does not occur；Softening point temperature is high, and when mixing is not easy to melt because temperature increases；It is unlikely in mixed-powder
So that its apparent density and mobility is obviously deteriorated because adding these substances, will not have an adverse effect to sintering bulk properties；
It when heating, is easy to be discharged in gas from green compact, and this gas does not influence to be sintered furnace li`.
Specific embodiment
A kind of MOX powder forming agent and lubricant adding method, comprising the following steps:
Step 1: zinc stearate is chosen, wherein metal Zn content 10~11.2% in zinc stearate, free fatty acid is less than
0.5%, water content is less than 0.5%, 20~200 mesh of granularity, chooses MOX particle, and granularity is 185~500 μm, specific surface area 3
~18m2/ g, impurity content are 250~2600 μ g/g, and apparent density is 15~20%TD, and filling rate is 78~80%, Carr stream
Dynamic sex index 51~65,41~48%TD of compact density；Zinc stearate can be replaced with calcium stearate or stearic acid lithium；
Step 2: drying 0.5~3h for zinc stearate particle under conditions of 15~40 DEG C, 0.01~0.5Pa of vacuum degree,
Volatile impurity element therein is removed, and the excessively high caused particle of temperature is avoided to increase phenomenon and fusing extremely；
Step 3: screening process is carried out to the zinc stearate particle handled through step 2 with the sieve of 20~100 mesh；
Step 4: calculating required MOX grain amount with 15~35% filling rate and be added in ball grinder, will be through step
The zinc stearate particle of three processing is added in MOX particle with 0.02~5.0% weight ratio, logical with the speed of 5~15L/min
The cooling water for entering 15~38 DEG C avoids reunion and melting phenomenon caused by generating heat because of material
Step 5: 5~45min is mixed with the speed of 1~10r/min, mixes zinc stearate particle and MOX particle tentatively
Uniformly, batch mixer revolving speed is then incrementally increased with the speed of 1~20r/min, the mixed processing under the speed of 10~100r/min
15~600min avoids MOX Particle Breakage caused by being vigorously mixed
Step 6: gradually reducing batch mixer revolving speed with the speed of 1~10r/min until stopping, and stops 5~30min of mixing
Afterwards, cooling water is closed.
Claims (3)
1. a kind of MOX powder forming agent and lubricant adding method, it is characterised in that: the following steps are included:
Step 1: zinc stearate is chosen, wherein metal Zn content 10~11.2% in zinc stearate, free fatty acid is less than
0.5%, water content is less than 0.5%, 20~200 mesh of granularity, chooses MOX particle, and granularity is 185~500 μm, specific surface area 3
~18m2/ g, impurity content are 250~2600 μ g/g, and apparent density is 15~20%TD, and filling rate is 78~80%, Carr stream
Dynamic sex index 51~65,41~48%TD of compact density；
Step 2: drying 0.5~3h for zinc stearate particle under conditions of 15~40 DEG C, 0.01~0.5Pa of vacuum degree, removal
Volatile impurity element therein, and the excessively high caused particle of temperature is avoided to increase phenomenon and fusing extremely；
Step 3: screening process is carried out to the zinc stearate particle handled through step 2 with the sieve of 20~100 mesh；
Step 4: with 15~35% filling rate calculate needed for MOX grain amount simultaneously be added in ball grinder, will be through step 3 at
The zinc stearate particle of reason is added in MOX particle with 0.02~5.0% weight ratio, is passed through 15 with the speed of 5~15L/min
~38 DEG C of cooling water avoids reunion and melting phenomenon caused by generating heat because of material；
Step 5: 5~45min is mixed with the speed of 1~10r/min, mixes zinc stearate particle and MOX particle tentatively
It is even, batch mixer revolving speed is then incrementally increased with the speed of 1~20r/min, the mixed processing 15 under the speed of 10~100r/min
~600min avoids MOX Particle Breakage caused by being vigorously mixed.
2. a kind of MOX powder forming agent according to claim 1 and lubricant adding method, it is characterised in that: further include
Step 6: gradually reducing batch mixer revolving speed with the speed of 1~10r/min until stopping, and after stopping 5~30min of mixing, closes cold
But water.
3. a kind of MOX powder forming agent according to claim 1 and lubricant adding method, it is characterised in that: the step
In rapid one, zinc stearate can be replaced with calcium stearate or stearic acid lithium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610834813.XA CN107845433B (en) | 2016-09-20 | 2016-09-20 | A kind of MOX powder forming agent and lubricant adding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610834813.XA CN107845433B (en) | 2016-09-20 | 2016-09-20 | A kind of MOX powder forming agent and lubricant adding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107845433A CN107845433A (en) | 2018-03-27 |
| CN107845433B true CN107845433B (en) | 2019-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610834813.XA Active CN107845433B (en) | 2016-09-20 | 2016-09-20 | A kind of MOX powder forming agent and lubricant adding method |
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Families Citing this family (1)
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| CN110164574B (en) * | 2019-07-02 | 2021-04-02 | 中国原子能科学研究院 | Preparation method of honeycomb fuel pellet |
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| WO2001018822A1 (en) * | 1999-09-06 | 2001-03-15 | European Community (Ec) | Method for producing nuclear fuel pellets of the mox type |
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Effective date of registration: 20231028 Address after: 732850 Gansu Mining Area, Qilihe District, Lanzhou City, Gansu Province Patentee after: THE 404 COMPANY LIMITED, CHINA NATIONAL NUCLEAR Corp. Patentee after: CNNC 404 Chengdu nuclear technology engineering design and Research Institute Co.,Ltd. Address before: No. 888, South Tianfu Avenue, Huayang street, Tianfu New District, Chengdu, Sichuan 610000 Patentee before: CNNC 404 Chengdu nuclear technology engineering design and Research Institute Co.,Ltd. |
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