CN104821187B - A kind of Al2O3Adulterate UO2‑10wt%Gd2O3Burnable poison and preparation method thereof - Google Patents

A kind of Al2O3Adulterate UO2‑10wt%Gd2O3Burnable poison and preparation method thereof Download PDF

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CN104821187B
CN104821187B CN201510106192.9A CN201510106192A CN104821187B CN 104821187 B CN104821187 B CN 104821187B CN 201510106192 A CN201510106192 A CN 201510106192A CN 104821187 B CN104821187 B CN 104821187B
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burnable poison
mixed solution
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CN104821187A (en
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王辉
潘小强
黄华伟
解怀英
尹昌耕
邱绍宇
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Nuclear Power Institute of China
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/02—Control of nuclear reaction by using self-regulating properties of reactor materials, e.g. Doppler effect
    • G21C7/04—Control of nuclear reaction by using self-regulating properties of reactor materials, e.g. Doppler effect of burnable poisons
    • 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
    • G21C21/18—Manufacture of control elements covered by group G21C7/00
    • 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
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    • Y02E30/30—Nuclear fission reactors

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Abstract

The invention discloses a kind of Al2O3Adulterate UO210wt%Gd2O3Burnable poison and preparation method thereof.The Al2O3Adulterate UO210wt%Gd2O3, consist of the following components in percentage by weight：Al2O30 0.4wt%；Gd2O310wt%；Surplus is UO2.The present invention also provides a kind of method for preparing above-mentioned burnable poison, and this method technique is simple, and cost is low and obtained burnable poison has excellent crystallite dimension, sintered density and thermal conductivity.The present invention is by UO210wt%Gd2O3Al is adulterated in burnable poison2O3So that the burnable poison for improving gadolinium oxide concentration still has excellent sintered density, crystallite dimension and thermal conductivity.

Description

A kind of Al2O3Adulterate UO2-10wt%Gd2O3Burnable poison and preparation method thereof
Technical field
The invention belongs to nuclear industry fuel area, in particular it relates to a kind of Al2O3Adulterate UO2- 10wt%Gd2O3Flammable poison Thing and preparation method thereof.
Background technology
In domestic and international nuclear power reactor, particularly widely used UO in pressurized-water reactor nuclear power plant reactor core2-Gd2O3Burnable poison fuel To control reactor initial reactivity, flattening core power distribution is realized, burnup is improved, extends the refulling cycle, so as to reduce core Electric operating cost, improve the safety and reliability of operation.The UO of nuclear power plant at present2-Gd2O3The preparation method of burnable poison Although with commercial UO2The manufacturing process of pellet is similar, but UO2-Gd2O3Burnable poison prepares difficulty and is but far above UO2Pellet. Under identical sintering process conditions, gadolinium oxide (Gd2O3) addition not only reduce UO2The crystallite dimension of pellet, reduce UO2The consistency of pellet, while reduction UO also be present2The problem of thermal conductivity, it is caused to be discharged during nuclear reactor is run more Fission gas void swelling etc. occurs as topic, so as to which the security and economy of nuclear reactor operation will be influenceed.
UO2-Gd2O3The concentration range of gadolinium oxide is generally 2-6wt% in burnable poison, and main cause has：1st, because at present The fuel recycle length of nuclear power station and the limitation of design burn-up, are calculated by reactor physics, draw Gd2O3Content in 2- Between 6wt%；2、UO2-Gd2O3The preparation of fuel has technical difficulty, usually Gd2O3Content is higher, and fuel pellet prepares difficulty It is bigger, in the manufacture of commercial combustible poison core block, also require Gd2O3Content be no more than 6wt%.
However as the increase of fuel recycle length, UO2-Gd2O3The gadolinium oxide of higher concentration is just needed in burnable poison. But it will further reduce UO with the raising of gadolinium oxide concentration2-Gd2O3The sintered density of burnable poison, crystallite dimension and Thermal conductivity.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of UO of high oxidation gadolinium concentration2-Gd2O3Burnable poison, and should Burnable poison has excellent sintered density, crystallite dimension and thermal conductivity.
Technical scheme is used by the present invention solves the above problems：
A kind of Al2O3Adulterate UO2- 10wt%Gd2O3, consist of the following components in percentage by weight：
Al2O30-0.4wt%；Gd2O310wt%；Surplus is UO2。
The present inventor is in UO2- 10wt%Gd2O3Al is adulterated in burnable poison2O3, on the one hand, doping Al2O3Flammable poison Gadolinium oxide concentration in thing improves, and can deepen nuclear reactor fuel burnup, increase fuel recycle length, improve nuclear reactor fortune Capable safety and reliability, on the other hand, Al is adulterated in the burnable poison2O3, can be obviously improved dense due to improving gadolinium oxide The phenomenon that sintered density, crystallite dimension and the thermal conductivity spent and brought reduce.
And with the raising of gadolinium oxide concentration, it is extremely difficult in manufacture after 10wt%, while give reactor operation Bring the influence of negative neutron economy.And the inventors discovered that when gadolinium oxide concentration is 10wt%, adulterate Al2O3Can It is preferable to fire the various performance parameters of poisonous substance, and is relatively easy to manufacture.
UO is found through experiments that in the present inventor2- 10wt%Gd2O3The crystallite dimension of burnable poison is about 6.5 μm, sintering is close Degree is about 10.42g/cm3, thermal conductivity be about 0.047W/ (cm. DEG C)；And adulterate Al2O3UO afterwards2- 10wt%Gd2O3Flammable poison The crystallite dimension of thing can reach 16.0 μm, sintered density can reach 10.58g/cm3, thermal conductivity can reach 0.055W/ (cm. DEG C)； It can be seen that：Adulterate Al2O3Burnable poison crystallite dimension be about undoped with more than 2 times, and sintered density and thermal conductivity are equal Compared with undoped with have significant difference (p ＜ 0.05).This is due in UO2- 10wt%Gd2O3The Al adulterated in burnable poison2O3 Belong to active sintering aid, beneficial to sintering, reduce activation energy.The pinning effect of crystal boundary is reduced, so that crystallite dimension suitably increases Add.The material of doping can form highly thermally conductive phase that is stable, being connected with each other in combustible poison core block, so as to be carried beneficial to thermal conductivity It is high.
Wherein, the present inventor, which tests, finds：Work as Al2O3When doping is more than 0.4wt%, Al2O3The precipitation of free phase with Al2O3Doping increase and it is further obvious, so as to influence the mechanics of burnable poison and chemical property, and as the Al of doping2O3Contain Measure for 0.1wt% when, the sintered density of burnable poison compared with undoped with burnable poison there is significant difference (p ＜ 0.05), because This, the Al2O3The preferred 0.1-0.4wt% of content；Al2O3Doping rises to 0.4wt%, the burning of burnable poison from 0.1wt% Knot density also increases, to Al2O3When doping reaches 0.4wt%, the sintered density of burnable poison reaches optimal, about 10.58g/cm3, compared to undoped with there is pole significant difference (p ＜ 0.01), then the sintered density of burnable poison with Al2O3The increase of doping and decline, therefore, Al2O3The further preferred 0.3-0.4wt% of doping；Optimal preferred Al2O3Doping Measure as 0.4wt%.
Al described herein2O3Adulterate UO2- 10wt%Gd2O3It can be prepared using traditional ripe powder metallurgical technique, Although this method looks that economy perhaps can be better, but the product inner homogeneous prepared is unmanageable, densification Difficult, internal porosity and defect are more, and a large amount of dust is produced in preparation process, pollute environment, damage the body of personnel Health.
Also have in the prior art and use the preferable burnable poison of sol-gel technology processability, but use colloidal sol-solidifying Complex procedures prepared by adhesive process, very strict, composition and ratio, temperature to raw material are required to material degree of purity and environment temperature The technological parameters such as degree, pressure all there are strict requirements could form sol-gel, and moreover, sol-gel process prepares production The cost of product is very high, and the distance from laboratory research to commodity production is very big, and economy has very big inferior position.
Therefore, the present invention provides a kind of Al that can effectively overcome disadvantages mentioned above2O3Adulterate UO2- 10wt%Gd2O3Flammable poison The preparation method of thing, this method preparation section is simple, and the technological parameter in preparation process limits less, has to environment temperature more preferable Compatibility, and cost is low, easily expands preparation technology, economical, it is mainly included the following steps that：
1)UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution preparation：
By U3O8、Gd2O3Carry out prebake after,
The U after the prebake is weighed in proportion3O8And Gd2O3, the filtrate obtained after blended, dissolving, filtering is UO2 (NO3)2With Gd (NO3)3Mixed solution,
By Al2O3Shared ratio weighs appropriate aluminum oxide (Al2O3), add water to stir, dissolved with appropriate concentrated nitric acid To stable aluminum nitrate (Al (NO3)3) solution,
Obtained aluminum nitrate solution is dissolved in into above-mentioned UO2(NO3)2With Gd (NO3)3Mixed solution in form UO2(NO3)2、 Gd(NO3)3With Al (NO3)3Mixed solution；
2) saturation (NH4)2CO3The preparation of solution：
Appropriate ammonium carbonate is weighed, adds water to stir, is configured to saturation (NH4)2CO3Solution；
3) precipitation reaction：
Take UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution, stirring, be heated to 40-45 DEG C of reaction temperature, so Back adds saturation (NH4)2CO3Solution side is stirred, and the pH value for adjusting solution is maintained at 6.5-7.5, and charging adds nothing after terminating Water-ethanol is complete to mixed solution precipitation reaction；
4) drying and calcining：
The sediment obtained after above-mentioned precipitation reaction is carried out to be filtrated to get filter cake, dried after Washing of Filter Cake at 65-70 DEG C Dry 15-20h obtains precursor powder, precursor powder is incubated into 2.0-3.0h in 650-700 DEG C, cooling, grinding obtain UO2- Gd2O3-Al2O3Powder；
5) vacuum-sintering：
After the repressed shaping of powder after above-mentioned drying and calcining, vacuum-sintering obtains Al2O3Adulterate UO2- 10wt% Gd2O3Burnable poison.
The Al being prepared using herein described method2O3Adulterate UO2- 10wt%Gd2O3Burnable poison has internal equal Even property, the advantages that purity and crystal structure are good, sintering temperature is low, good mechanical performance.
Wherein, the 1) UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution preparation section step it is as follows：
By U3O82.5h is dried at 350 DEG C, by Gd2O3Powder dries 2h at 550 DEG C,
The U after the prebake is weighed in proportion3O8And Gd2O3, it is put into dissolving tank, adds appropriate deionized water, stir During mixing, appropriate concentrated nitric acid dissolving is added, dissolves 25-30min, the filtrate obtained after filtering is UO2(NO3)2And Gd (NO3)3Mixed solution,
By Al2O3Shared ratio weighs appropriate aluminum oxide, adds appropriate amount of deionized water, in whipping process, adds appropriate Concentrated nitric acid dissolving after the aluminum nitrate solution stablized,
The aluminum nitrate solution of preparation is added to UO while stirring2(NO3)2With Gd (NO3)3Mixed solution in, stir 20- 25min, form uniform UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution.
Wherein, the process of the 3) precipitation reaction is as follows：
By UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution be added in stillpot, stir, be heated to reacting 40-45 DEG C of temperature, then by saturation (NH4)2CO3Solution is added drop-wise in stillpot with 7-8ml/min speed, and regulation mixing is molten The pH value of liquid, keeps it in 6.5-7.5, stir, reacts fully when being added dropwise, and feeding, it is appropriate anhydrous to be added after terminating Ethanol is complete to mixed solution precipitation reaction, loses flowability.
Wherein, the process of the 4) drying and calcining is as follows：
The sediment obtained after above-mentioned precipitation reaction is carried out being filtrated to get filter cake, filter cake is washed 3-4 times with absolute ethyl alcohol Afterwards, 15-20h is dried at 65-70 DEG C and obtains precursor powder, precursor powder is incubated 2.0-3.0h in 650-700 DEG C, it is cold But, grinding obtains UO2-Gd2O3-Al2O3Powder.
Wherein, the process conditions of the 5) vacuum-sintering are：Sintering temperature is 1550 DEG C -1650 DEG C, soaking time is 5.0-6.0h, heating rate are 28 DEG C/min, vacuum 10-2-10-3Pa, sintering atmosphere H2。
Wherein, the pressed by powder after the drying and calcining is shaped to diameter 8mm, height 10mm cylindrical powder briquetting, Typed pressure is 3.8ton/cm2。
Wherein, in the precipitation reaction step, the absolute ethyl alcohol of addition plays stable and cleaning function, itself and mixed solution body System is more stable, does not react, and absolute ethyl alcohol is easier to volatilize in itself, and molecular weight is small, holds in follow-up drying process Easily remove.
To sum up, the beneficial effects of the invention are as follows：The application passes through in UO2-Gd2O3Al is adulterated in burnable poison2O3, can improve The concentration of gadolinium oxide can also keep the burnable poison to have good sintered density, crystallite dimension and thermal conductivity to 10wt%.
Brief description of the drawings
Fig. 1 is the different Al of doping2O3The UO of content2- 10wt%Gd2O3The XRD diffracting spectrums of burnable poison, wherein, A is not Adulterate Al2O3UO2- 10wt%Gd2O3Burnable poison, B are doping 0.2wt%Al2O3UO2- 10wt%Gd2O3Burnable poison, C is doping 0.4wt%Al2O3UO2- 10wt%Gd2O3Burnable poison, D are doping 0.5wt%Al2O3UO2- 10wt% Gd2O3Burnable poison；
Fig. 2 is the different Al of doping2O3The UO of content2- 10wt%Gd2O3The sintered density curve map of burnable poison.
Embodiment
With reference to embodiment, the present invention is described in further detail, but the implementation of the present invention is not limited to this.
Embodiment 1
The first step, by the pure U of core level3O82.5h is dried at 350 DEG C, by the Gd that purity is 99.9%2O3Powder is at 550 DEG C Lower drying 2h.By UO2- 10wt%Gd2O3Gd in burnable poison2O3Shared mass fraction, 89.9g UO are taken respectively2Powder (89.9wt%), 10g Gd2O3Powder (10wt%) is put into dissolving tank, is added a certain amount of deionized water toward it, is quickly being stirred Under the conditions of mixing, appropriate concentrated nitric acid dissolving is added, after dissolving 25min, after filtering out insoluble matter, forms UO2(NO3)2With Gd (NO3)3 Homogeneous mixture solotion.
With Al2O3The mass ratio for accounting for prepared burnable poison calculates for 0.1wt%, weighs 0.1g aluminum oxide and is put into burning In cup, a certain amount of deionized water is added toward it, under rapid mixing conditions, stabilization is obtained after adding appropriate concentrated nitric acid dissolving Aluminum nitrate solution.The aluminum nitrate solution prepared is slowly dropped into UO under rapid stirring2(NO3)2And Gd (NO3)3Mixed solution in, and be stirred continuously 20min, form uniform UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mix molten Liquid.
The pure solid carbonic acid ammonium of analysis for weighing 85g is put into beaker, is added deionized water and constantly quick stirring toward it, is matched somebody with somebody Into saturation (NH4)2CO3Solution.
Second step：By UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution is added in stillpot, is started stirring, is added Heat arrives 40 DEG C of reaction temperature, then by saturation (NH4)2CO3Solution is added drop-wise in stillpot with 7ml/min speed, regulation mixing The pH value of solution, keeps it in 7 or so, the strong stirring in drop, it is fully reacted, charging adds 30ml's after terminating Absolute ethyl alcohol, mixed solution precipitation reaction is complete after a period of time, loses flowability.Then sediment is filtrated to get Filter cake, after filter cake washs 3 times with absolute ethyl alcohol, drying 20h obtains precursor powder at 65 DEG C.
3rd step, dried precursor powder is incubated 3h for 650 DEG C in batch-type furnace, is taken out after air cooling and grinds to obtain UO2-Gd2O3-Al2O3Powder.Finally by (typed pressure 3.8ton/cm after the repressed shaping of the powder of drying and calcining2, sample Size is：Diameter be about 8mm, height be about 10mm cylindrical briquettes) vacuum be 3.5 × 10-3Pa, sintering temperature are： 1600 DEG C, soaking time 5h, heating rate be 28 DEG C/min, sintering atmosphere H2Under conditions of vacuum-sintering obtain densification Al2O3Adulterate UO2- 10wt%Gd2O3Burnable poison.
The solid density of burnable poison obtained above is not less than 95.8%T.D, and crystallite dimension is 13.2 μm, and thermal conductivity is 0.050W/(cm.℃)。
Embodiment 2
Al is prepared using method same as Example 12O3Adulterate UO2- 10wt%Gd2O3Burnable poison, itself and embodiment 1 Difference be：Al2O3The content for accounting for the burnable poison is 0.3wt%, and the corresponding amount for weighing aluminum oxide is 0.30g, UO2Powder End is 89.7g UO2Powder (89.7wt%)
The solid density of burnable poison obtained above is not less than 95.8%T.D, and crystallite dimension is 15.0 μm, and thermal conductivity is 0.053W/(cm.℃)。
Embodiment 3
Al is prepared using method same as Example 12O3Adulterate UO2- 10wt%Gd2O3Burnable poison, itself and embodiment 1 Difference be：Al2O3The content for accounting for the burnable poison is 0.4wt%, and the corresponding amount for weighing aluminum oxide is 0.40g, UO2Powder End is 89.6g UO2Powder (89.6wt%).
The solid density of burnable poison obtained above is not less than 95.8%T.D, and crystallite dimension is 16.0 μm, and thermal conductivity is 0.055W/(cm.℃)。
Embodiment 4
UO is prepared using method same as Example 12- 10wt%Gd2O3Burnable poison, the difference of itself and embodiment 1 exist In：Al is not contained in the burnable poison2O3。
Embodiment 5
Al is prepared using method same as Example 12O3Adulterate UO2- 10wt%Gd2O3Burnable poison, itself and embodiment 1 Difference be：Al2O3The content for accounting for the burnable poison is 0.5wt%, and the corresponding amount for weighing aluminum oxide is 0.50g, UO2Powder End is 89.5g UO2Powder (89.5wt%).
The solid density of burnable poison obtained above is not less than 10.54%T.D, and crystallite dimension is 15.2 μm, thermal conductivity For 0.054W/ (cm. DEG C).
The burnable poison being prepared is tested to obtain Fig. 1-2, respectively adulterates different Al2O3The UO of content2- 10wt%Gd2O3The XRD diffracting spectrums and sintered density figure of burnable poison.It will be seen from figure 1 that Al2O3It is doped to There is trace of Al during 0.4wt%2O3Free phase separates out, and Al2O3When doping is more than 0.4wt%, Al2O3The precipitation of free phase with Al2O3Doping increase and it is further obvious, therefore, the application selects doping Al2O3Content is no more than 0.4wt%.
Refering to Fig. 2, it can be seen that as the Al of doping2O3When content is 0.1wt%, the sintered density of burnable poison relative to Undoped with the sintered density of burnable poison be significantly increased, from 10.42g/cm3Increase to 10.52g/cm3, have conspicuousness poor Different (p ＜ 0.05).The Al of doping2O3When content continues to increase to 0.4wt%, the sintered density of burnable poison is optimal, then With Al2O3The increase of content, the sintered density of burnable poison are on a declining curve.Therefore, the Al of doping2O3Content optimal selection 0.4wt%, now, the sintered density of burnable poison is 10.58g/cm3, compared to undoped with there is pole significant difference (p ＜ 0.01).
In summary, the present invention provides a kind of UO of high oxidation gadolinium concentration2-Gd2O3Burnable poison, and in the UO2-Gd2O3 Appropriate Al is adulterated in burnable poison2O3So that the UO of high oxidation gadolinium concentration2-Gd2O3Burnable poison remains to keep excellent sintering Density, crystallite dimension and thermal conductivity.
As described above, it can preferably realize the present invention.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, according to According to the technical spirit of the present invention, within the spirit and principles in the present invention, any simple modification for being made to above example, Equivalent substitution and improvement etc., still fall within the protection domain of technical solution of the present invention.

Claims (7)

  1. A kind of 1. Al2O3Adulterate UO2-10wt%Gd2O3Burnable poison, it is characterised in that by following components in percentage by weight group Into：
    Al2O3 0.3-0.4wt%；Gd2O310wt%；Surplus is UO2。
  2. 2. Al according to claim 12O3Adulterate UO2-10wt%Gd2O3Burnable poison, it is characterised in that the Al2O3Contain Measure as 0.4wt%.
  3. A kind of 3. Al as claimed in claim 1 or 22O3Adulterate UO2-10wt%Gd2O3The preparation method of burnable poison, its feature It is, comprises the following steps：
    1）UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution preparation：
    By U3O8 、Gd2O3Carry out prebake after,
    The U after the prebake is weighed in proportion3O8And Gd2O3, blended, concentrated nitric acid dissolving, the filtrate obtained after filtering are UO2(NO3)2With Gd (NO3)3Mixed solution,
    By Al2O3Shared ratio weighs appropriate aluminum oxide, adds water to stir, and the nitre stablized is dissolved with appropriate concentrated nitric acid Sour aluminum solutions,
    Obtained aluminum nitrate solution is dissolved in into above-mentioned UO2(NO3)2With Gd (NO3)3Mixed solution in form UO2(NO3)2、Gd (NO3)3With Al (NO3)3Mixed solution；
    2）Saturation (NH4)2CO3The preparation of solution：
    Appropriate ammonium carbonate is weighed, adds water to stir, is configured to saturation (NH4)2CO3Solution；
    3）Precipitation reaction：
    Take UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution, stirring, be heated to 40-45 DEG C of reaction temperature, then side adds Enter saturation (NH4)2CO3Solution side is stirred, and the pH value for adjusting solution is maintained at 6.5-7.5, and charging adds absolute ethyl alcohol after terminating It is complete to mixed solution precipitation reaction；
    4）Drying and calcining：
    The sediment obtained after above-mentioned precipitation reaction is carried out to be filtrated to get filter cake, 15- is dried at 65-70 DEG C after Washing of Filter Cake 20h obtains precursor powder, precursor powder is incubated into 2.0-3.0h in 650-700 DEG C, cooling, grinding obtain UO2-Gd2O3- Al2O3Powder；
    5）Vacuum-sintering：
    After the repressed shaping of powder after above-mentioned drying and calcining, vacuum-sintering obtains Al2O3Adulterate UO2-10wt%Gd2O3It is flammable Poisonous substance.
  4. 4. Al according to claim 32O3Adulterate UO2-10wt%Gd2O3The preparation method of burnable poison, it is characterised in that Described 1）UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution preparation section step it is as follows：
    By U3O82.5h is dried at 350 DEG C, by Gd2O3Powder dries 2h at 550 DEG C,
    The U after the prebake is weighed in proportion3O8And Gd2O3, it is put into dissolving tank, adds appropriate deionized water, it is stirred Cheng Zhong, appropriate concentrated nitric acid dissolving is added, dissolves 25-30min, the filtrate obtained after filtering is UO2(NO3)2With Gd (NO3)3 Mixed solution,
    By Al2O3Shared ratio weighs appropriate aluminum oxide, adds appropriate amount of deionized water, in whipping process, adds appropriate dense The aluminum nitrate solution stablized after nitric acid dissolving,
    The aluminum nitrate solution of preparation is added to UO while stirring2(NO3)2With Gd (NO3)3Mixed solution in, stir 20- 25min, form uniform UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution.
  5. 5. Al according to claim 32O3Adulterate UO2-10wt%Gd2O3The preparation method of burnable poison, it is characterised in that Described 3）The process of precipitation reaction is as follows：
    By UO2(NO3)2、Gd(NO3)3With Al (NO3)3Mixed solution be added in stillpot, stir, be heated to reaction temperature 40-45 DEG C, then by saturation (NH4)2CO3Solution is added drop-wise in stillpot with 7-8ml/min speed, adjusts mixed solution PH value, 6.5-7.5 is kept it in, stir, react fully when being added dropwise, charging adds appropriate absolute ethyl alcohol after terminating It is complete to mixed solution precipitation reaction.
  6. 6. Al according to claim 32O3Adulterate UO2-10wt%Gd2O3The preparation method of burnable poison, it is characterised in that Described 4）The process of drying and calcining is as follows：
    The sediment obtained after above-mentioned precipitation reaction is carried out being filtrated to get filter cake, after filter cake is washed 3-4 times with absolute ethyl alcohol, 15-20h is dried at 65-70 DEG C and obtains precursor powder, precursor powder is incubated 2.0-3.0h in 650-700 DEG C, cools down, grind Mill obtains UO2-Gd2O3-Al2O3Powder.
  7. 7. Al according to claim 32O3Adulterate UO2-10wt%Gd2O3The preparation method of burnable poison, it is characterised in that Described 5）The process conditions of vacuum-sintering are：Sintering temperature is 1550 DEG C -1650 DEG C, soaking time 5.0-6.0h, heating speed Rate is 28 DEG C/min, vacuum 10-2-10-3Pa, sintering atmosphere H2。
CN201510106192.9A 2015-03-11 2015-03-11 A kind of Al2O3Adulterate UO2‑10wt%Gd2O3Burnable poison and preparation method thereof Active CN104821187B (en)

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