CN116417164A - U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 Process for producing pellets - Google Patents
U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 Process for producing pellets Download PDFInfo
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- CN116417164A CN116417164A CN202111655301.4A CN202111655301A CN116417164A CN 116417164 A CN116417164 A CN 116417164A CN 202111655301 A CN202111655301 A CN 202111655301A CN 116417164 A CN116417164 A CN 116417164A
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- powder
- core block
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- adu
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- 239000000843 powder Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000008188 pellet Substances 0.000 title claims description 15
- 238000005245 sintering Methods 0.000 claims abstract description 39
- 239000000654 additive Substances 0.000 claims abstract description 29
- 230000000996 additive effect Effects 0.000 claims abstract description 26
- 238000003825 pressing Methods 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 238000005469 granulation Methods 0.000 claims abstract description 11
- 230000003179 granulation Effects 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 230000003647 oxidation Effects 0.000 claims description 26
- 238000007254 oxidation reaction Methods 0.000 claims description 26
- 238000007493 shaping process Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 239000003758 nuclear fuel Substances 0.000 abstract description 3
- 238000003860 storage Methods 0.000 abstract description 2
- ZAASRHQPRFFWCS-UHFFFAOYSA-P diazanium;oxygen(2-);uranium Chemical compound [NH4+].[NH4+].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[U].[U] ZAASRHQPRFFWCS-UHFFFAOYSA-P 0.000 description 24
- 238000004886 process control Methods 0.000 description 5
- 238000006115 defluorination reaction Methods 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G43/00—Compounds of uranium
- C01G43/01—Oxides; Hydroxides
- C01G43/025—Uranium dioxide
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention relates to the technical field of nuclear fuel assembly manufacturing, and particularly discloses a U oxidized by utilizing ADU 3 O 8 Preparation of UO by powder addition 2 A process for the core block comprising the steps of: step 1: ADU powder is oxidized to U in an oxidizing furnace 3 O 8 A powder; step 2: u is set to 3 O 8 Powder, additive, UO 2 Mixing the powder, and performing rolling granulation; mixing and spheroidizing the granulated powder and the additive, and pressing to prepare a green compact core block; step 3: transferring the green compact core block into a high-temperature sintering furnace, and completing sintering of the green compact in the sintering furnace; step 4: grinding the sintered core block by using a grinder to obtain qualified UO 2 And (5) a core block. The process can effectively shorten the conversion of ADU into UO 2 Core blockThe process flow improves the material utilization efficiency and effectively relieves the material storage pressure of the production site.
Description
Technical Field
The invention belongs to the technical field of nuclear fuel assembly manufacturing, and particularly relates to a U oxidized by utilizing ADU 3 O 8 Preparation of UO by powder addition 2 And (3) a process of the core block.
Background
In the chemical conversion process of nuclear fuel assembly production, ADU (ammonium diuranate) powder is converted into qualified ceramic UO through defluorination reduction, stabilization and homogenization processes 2 The powder is used in fuel assembly production. A certain amount of ADU powder qualified in impurity can be produced in the production process of the ADU chemical conversion process, and the ADU powder can not be converted into UO in time through defluorination reduction, stabilization and homogenization processes 2 The powder and the conversion process flow is longer. Simultaneous UO 2 A certain amount of U needs to be added in the preparation process of the core block 3 O 8 U oxidized by powder, waste core block and grinding slag 3 O 8 The powder cannot meet the production throughput requirements.
Therefore, it is necessary to design a U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 And (3) processing the core blocks to solve the problems.
Disclosure of Invention
The invention aims to provide an oxidation method by utilizing ADUU of (2) 3 O 8 Preparation of UO by powder addition 2 And the process of the core blocks is used for improving the material turnover utilization efficiency.
The technical scheme of the invention is as follows:
u oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 A process for the core block comprising the steps of:
step 1: ADU powder oxidation
ADU powder is oxidized to U in an oxidizing furnace 3 O 8 A powder;
step 2: granulating and shaping
U is set to 3 O 8 Powder, additive, UO 2 Mixing the powder, and performing rolling granulation;
mixing and spheroidizing the granulated powder and the additive, and pressing to prepare a green compact core block;
step 3: sintering
Transferring the green compact core block into a high-temperature sintering furnace, and completing sintering of the green compact in the sintering furnace;
step 4: grinding
Grinding the sintered core block by using a grinder to obtain qualified UO 2 And (5) a core block.
In the step 1, the oxidation temperature is controlled to be 550-650 ℃ and the oxidation time is controlled to be 5-8 h.
U during the granulation of the rolled sheet in the step 2 3 O 8 The powder addition ratio is 10-20%.
In the step 2, the additive is added in the proportion of 0.05-0.07% during the granulation of the rolled tablet.
When the green pellets are pressed after granulating in the step 2, the additive is added in a proportion of 0.25-0.33%.
In the step 2, the additive is an AxParaffin.
In the step 2, the roll pressure is controlled to be 30-35 kN in the process of rolling and granulating.
In the step 2, the pressing pressure for pressing the green pellets is 30-40 kN.
In the step 2, the density of the prepared green pellets is 5.8-6.2 g/cm 3 。
In the step 3, the sintering temperature is controlled to 1720-1780 ℃ and the sintering time is controlled to 6-8 h.
The invention has the remarkable effects that:
(1) The process can effectively shorten the conversion of ADU into UO 2 The process flow of the core block improves the material utilization efficiency and effectively relieves the material storage pressure of the production site.
(2) The invention provides a UO 2 U for preparing and adding core block 3 O 8 Novel preparation process of powder.
(3) UO prepared by the invention 2 The core block completely meets the related technical requirements.
Drawings
Fig. 1 is a process flow diagram.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
U oxidized by ADU as shown in FIG. 1 3 O 8 Preparation of UO by powder addition 2 A process for the core block comprising the steps of:
step 1: ADU powder oxidation
ADU powder is oxidized to U in an oxidizing furnace 3 O 8 Powder, wherein the oxidation temperature is controlled to be 550-650 ℃ and the oxidation time is controlled to be 5-8 h in the process;
step 2: granulating and shaping
U is set to 3 O 8 Powder, additive, UO 2 Mixing the powder, and performing rolling granulation; wherein U is 3 O 8 The powder adding proportion is 10-20%, the additive adding proportion is 0.05-0.07%, and the process control roller pressure is 30-35 kN;
mixing and spheroidizing the granulated powder and the additive, and pressing to prepare a green compact core block; wherein the pressing pressure is 30-40 kN, the additive adding proportion is 0.25-0.33%, and the density of the prepared green pellet is 5.8-6.2 g/cm 3 ；
The additive is an AxParaffin;
step 3: sintering
Transferring the green compact core block into a high-temperature sintering furnace, and completing sintering of the green compact in the sintering furnace; wherein the sintering temperature is 1720-1780 ℃ and the sintering time is 6-8 h;
step 4: grinding
Grinding the sintered core block by using a grinder to obtain qualified UO 2 And (5) a core block.
Example 1
U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 The process of the core block comprises the following steps of
Step 1: ADU powder oxidation
ADU powder is oxidized to U in an oxidizing furnace 3 O 8 And (3) powder. The oxidation temperature is controlled to be 600 ℃ and the oxidation time is controlled to be 6 hours.
Step 2: granulating and shaping
U 3 O 8 Powder, additive, UO 2 Mixing the powder according to a certain adding proportion, and performing rolling granulation. U (U) 3 O 8 The powder addition ratio was 12%, the Ack wax additive ratio was 0.06%, and the process control roll pressure was 32kN.
And mixing the granulated powder with additives, spheroidizing, and pressing to obtain the green compact core block. The proportion of the AxPart additive is 0.30%, the pressing pressure is 35kN, and the density of the green pellet is 5.8g/cm 3 。
Step 3: sintering
Transferring the green pellets to a high temperature sintering furnace, and completing green sintering in the sintering furnace. Sintering temperature is 1730 ℃ and sintering time is 7h.
Step 4: grinding
Grinding the sintered core block by using a grinder to obtain qualified UO 2 And (5) a core block.
Example 2
U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 The process of the core block comprises the following steps of
Step 1: ADU powder oxidation
ADU powder is oxidized to U in an oxidizing furnace 3 O 8 And (3) powder. Process control oxidation temperature 650 DEG COxidation time is 5h.
Step 2: granulating and shaping
U 3 O 8 Powder, additive, UO 2 Mixing the powder according to a certain adding proportion, and performing rolling granulation. U (U) 3 O 8 The powder addition ratio was 15%, the Ack wax additive ratio was 0.05%, and the process control roll pressure was 35kN.
And mixing the granulated powder with additives, spheroidizing, and pressing to obtain the green compact core block. The proportion of the AxPart additive is 0.26%, the pressing pressure is 35kN, and the density of the green pellet is 6.0g/cm 3 。
Step 3: sintering
Transferring the green pellets to a high temperature sintering furnace, and completing green sintering in the sintering furnace. Sintering temperature 1750 ℃ and sintering time 6h.
Step 4: grinding
Grinding the sintered core block by using a grinder to obtain qualified UO 2 And (5) a core block.
Example 3
U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 The process of the core block comprises the following steps of
Step 1: ADU powder oxidation
ADU powder is oxidized to U in an oxidizing furnace 3 O 8 And (3) powder. The oxidation temperature is controlled to 650 ℃ and the oxidation time is 6h.
Step 2: granulating and shaping
U 3 O 8 Powder, additive, UO 2 Mixing the powder according to a certain adding proportion, and performing rolling granulation. U (U) 3 O 8 The powder addition ratio was 12%, the Ack wax additive ratio was 0.05%, and the process control roll pressure was 30kN.
And mixing the granulated powder with additives, spheroidizing, and pressing to obtain the green compact core block. The proportion of the AxPart additive is 0.30%, the pressing pressure is 35kN, and the density of the green pellet is 5.9g/cm 3 。
Step 3: sintering
Transferring the green pellets to a high temperature sintering furnace, and completing green sintering in the sintering furnace. Sintering temperature is 1730 ℃ and sintering time is 8h.
Step 4: grinding
Grinding the sintered core block by using a grinder to obtain qualified UO 2 And (5) a core block.
While the fundamental principles, principal features, and advantages of the present invention have been shown and described, it will be apparent to those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 The process of the core block is characterized in that: the method comprises the following steps:
step 1: ADU powder oxidation
ADU powder is oxidized to U in an oxidizing furnace 3 O 8 A powder;
step 2: granulating and shaping
U is set to 3 O 8 Powder, additive, UO 2 Mixing the powder, and performing rolling granulation;
mixing and spheroidizing the granulated powder and the additive, and pressing to prepare a green compact core block;
step 3: sintering
Transferring the green compact core block into a high-temperature sintering furnace, and completing sintering of the green compact in the sintering furnace;
step 4: grinding
Grinding the sintered core block by using a grinder to obtain qualified UO 2 And (5) a core block.
2. An oxidation U according to claim 1 3 O 8 Preparation of UO by powder addition 2 The process of the core block is characterized in that: in the step 1, the oxidation temperature is controlled to be 550-650 ℃ and the oxidation time is controlled to be 5-8 h.
3. An oxidation U according to claim 1 3 O 8 Preparation of UO by powder addition 2 The process of the core block is characterized in that: u during the granulation of the rolled sheet in the step 2 3 O 8 The powder addition ratio is 10-20%.
4. Preparation of UO by addition of ADU oxidized U3O8 powder according to claim 1 2 The process of the core block is characterized in that: in the step 2, the additive is added in the proportion of 0.05-0.07% during the granulation of the rolled tablet.
5. An oxidation U according to claim 1 3 O 8 Preparation of UO by powder addition 2 The process of the core block is characterized in that: when the green pellets are pressed after granulating in the step 2, the additive is added in a proportion of 0.25-0.33%.
6. An oxidation U according to claim 1 3 O 8 Preparation of UO by powder addition 2 The process of the core block is characterized in that: in the step 2, the additive is an AxParaffin.
7. An oxidation U according to claim 1 3 O 8 Powder additionPreparation of UO 2 The process of the core block is characterized in that: in the step 2, the roll pressure is controlled to be 30-35 kN in the process of rolling and granulating.
8. An oxidation U according to claim 1 3 O 8 Preparation of UO by powder addition 2 The process of the core block is characterized in that: in the step 2, the pressing pressure for pressing the green pellets is 30-40 kN.
9. An oxidation U according to claim 1 3 O 8 Preparation of UO by powder addition 2 The process of the core block is characterized in that: in the step 2, the density of the prepared green pellets is 5.8-6.2 g/cm 3 。
10. An oxidation U according to claim 1 3 O 8 Preparation of UO by powder addition 2 The process of the core block is characterized in that: in the step 3, the sintering temperature is controlled to 1720-1780 ℃ and the sintering time is controlled to 6-8 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111655301.4A CN116417164A (en) | 2021-12-31 | 2021-12-31 | U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 Process for producing pellets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111655301.4A CN116417164A (en) | 2021-12-31 | 2021-12-31 | U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 Process for producing pellets |
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| Publication Number | Publication Date |
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| CN116417164A true CN116417164A (en) | 2023-07-11 |
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| CN202111655301.4A Pending CN116417164A (en) | 2021-12-31 | 2021-12-31 | U oxidized by ADU 3 O 8 Preparation of UO by powder addition 2 Process for producing pellets |
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- 2021-12-31 CN CN202111655301.4A patent/CN116417164A/en active Pending
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