CN104599725B - A kind of soluble gadolinium base neutron poison medicament and preparation method thereof - Google Patents
A kind of soluble gadolinium base neutron poison medicament and preparation method thereof Download PDFInfo
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- CN104599725B CN104599725B CN201410836250.9A CN201410836250A CN104599725B CN 104599725 B CN104599725 B CN 104599725B CN 201410836250 A CN201410836250 A CN 201410836250A CN 104599725 B CN104599725 B CN 104599725B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/24—Selection of substances for use as neutron-absorbing material
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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
- G21C21/18—Manufacture of control elements covered by group G21C7/00
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- 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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Abstract
The present invention relates to a kind of soluble gadolinium base neutron poison medicament, it is characterized in that, soluble coating by label and even application containing gadolinium-based material in piece wicking surface is constituted, and the weight of gadolinium-based material is the 75 100% of medicament gross weight in label, and the thickness of the coating is 0.01 0.1mm.Present invention also offers the preparation method of above-mentioned soluble gadolinium base neutron poison medicament, including the step such as coarse fodder heat treatment, coarse fodder grinding, fines is dry, fines is moulding, the surface treatment of medicament label, medicament label face coat.The soluble gadolinium base neutron poison medicament that the present invention is provided has the advantages that high mechanical strength, dissolution velocity be fast, stability is good.The preparation method for the soluble gadolinium base neutron poison medicament that the present invention is provided, production yield rate is high, and manufacturing cost is low.
Description
Technical field
The invention belongs to neutron poison medicament preparation field, and in particular to a kind of soluble gadolinium base neutron poison medicament and its
Preparation method.
Background technology
Neutron poison (English：Neutron poison) it is a kind of material with big neutron absorption cross-section, due to meeting pair
Chain reaction is adversely affected, and is referred to as " poisonous substance ", is commonly applied in reactor physics calculating.In reactor, we
Wish that neutron is absorbed by fissile material as far as possible, be allowed to occur nuclear fission.However, some materials have strong neutron capture
Phenomenon, can cause to reduce the reactivity of reactor operation.
The criticality safety of nuclear material is the foundation stone of nuclear safety, before being the safety that all techniques, method and system must assure that
Carry.No matter any operating mode is in, it is necessary to which which kind of means taken, finally pay much costs, criticality safety must all be guaranteed,
Otherwise the nuclear material chain reaction intermittently or serially occurred will cause an immeasurable loss.
Therefore, it is necessary to which develop one kind for Spent Fuel Pool can provide a large amount of and effective neutron poison under accident conditions
Medicament, it is ensured that Spent Fuel Pool and the irradiated fuel assembly wherein stored have enough subcriticalities.
The content of the invention
For the demand of prior art, it is an object of the present invention to provide a kind of soluble gadolinium base neutron poison medicament,
The neutron poison pharmacy particle has the advantages that high mechanical strength, dissolution velocity be fast, stability is good.
It is a further object to provide the preparation method of above-mentioned soluble gadolinium base neutron poison medicament, using the party
The production yield rate of pharmacy particle made from method is high, and manufacturing cost is low.
To achieve the above objectives, the technical solution adopted by the present invention is：A kind of soluble gadolinium base neutron poison medicament, by containing
The label and even application of gadolinium-based material are constituted in the soluble coating of piece wicking surface, and the weight of gadolinium-based material is medicament in label
The 75-100% of gross weight, the thickness of the coating is 0.01-0.1mm.
Further, the gadolinium-based material is chloride hydrate gadolinium, nitric hydrate gadolinium, hydrated sulfuric acid gadolinium or oxalic acid hydrate gadolinium；Shape
Material into the soluble coating is starch, glycan, chitosan, PLA, polyethylene glycol or polylactic-co-glycolic acid.
Further, the cosolvent in the label also containing the 1%-25% for accounting for medicament gross weight.
Further, the cosolvent is sodium acid carbonate, ammonium carbonate or their mixture.
A kind of preparation method for soluble gadolinium base neutron poison medicament that the present invention is provided, comprises the following steps：
Coarse fodder is heat-treated：Gadolinium-based material is weighed as coarse fodder by proportioning, is less than 50% big compression ring in 50 DEG C of normal pressure, humidity
Make to reach after thermal balance within the border, maintain 20-60 minutes；
Coarse fodder is ground：Coarse fodder after heat treatment is ground, fines is formed；
Fines is dried：The fines of acquisition is placed on platform and sprawled, is dried；
Fines is moulding：Compressing tablet process is carried out to the fines after heat treatment, medicament label is obtained；
Medicament label is surface-treated：Satisfactory medicament label is filtered out, piece wicking surface is handled, is formed coarse
Surface, and remove the clout for remaining in piece wicking surface；
Medicament label face coat：Soluble material is coated in medicament piece wicking surface, the coating of thickness needed for being formed.
Further, in coarse fodder grinding steps, grinding makes the particle diameters of obtained fines reach 500-800 microns.
Further, in fines drying steps, fines is spread to thin thickness of feed layer for 1-10 millimeters, 35-40 DEG C of normal pressure,
Humidity is dried 20-40 minutes in the atmospheric environment less than 50%.
Further, in the moulding step of fines, the ambient humidity of tableting processes is less than 5%, pressure 10-15MPa, maintains 10-
15 minutes.The medicament label that tabletting is formed can be cylindrical label, 4-6 millimeters of thickness (cylinder height), diameter (cylinder
Basal diameter) 12-15 millimeters.
Further, in medicament label surface treatment step, medicament label surface treatment is carried out using sand-blasting machine, is formed
The absolute roughness of rough surface is between 0.01-0.05 millimeters；Formed after rough surface, with 40 DEG C of air scavenging medicament label tables
The powder and material spray of face residual
Further, before coarse fodder grinding steps, the 1-25% for accounting for medicament gross weight is added in the coarse fodder after heat treated
Cosolvent, the cosolvent be sodium acid carbonate, ammonium carbonate or their mixture.If the crystal grain of cosolvent in itself is very
Small, for example particle size is less than 500 microns, can not be ground, is applied directly in the fines after grinding.
The soluble gadolinium base neutron poison medicament that the present invention is provided has that high mechanical strength, dissolution velocity be fast, stability is good
The advantages of.The preparation method for the soluble gadolinium base neutron poison medicament that the present invention is provided, production yield rate is high, and manufacturing cost is low.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the preparation method for soluble gadolinium base neutron poison medicament that the present invention is provided.
Embodiment
The invention will be further described with reference to the accompanying drawings and detailed description.
Embodiment 1
Coarse fodder is heat-treated：It is 5-6 chloride hydrate gadolinium as coarse fodder to take 50kg average crystallites water, in 50 DEG C of normal pressure, wet
Degree makes to reach after thermal balance, maintained 20 minutes in the atmospheric environment less than 50%；
Coarse fodder is ground：The coarse fodder after heat treatment is ground using ball mill, 600- is reached to its particle diameters
800 microns, form fines；
Fines is dried：Obtain after fines, sprawled immediately on platform, be spread to thin thickness of feed layer for 10 millimeters,
35-40 DEG C of normal pressure, humidity are dried 40 minutes in the atmospheric environment less than 50%；
Fines is moulding：Fines after heat treatment is loaded into tablet press machine and is pressed into cylindrical medicament label, cylindrical medicament piece
6 millimeters of the thickness (cylinder height) of core, 15 millimeters of diameter (cylinder basal diameter), in tableting processes, ambient humidity is less than
5%, pressure 10MPa, are maintained 10-15 minutes；
Medicament label is surface-treated：After fines is moulding, craft or machine filter out complete without substantially incomplete geometry
Medicament piece, using sand-blasting machine treatment agent piece, forms rough surface, absolute roughness is between 0.01 to 0.05 millimeter, and sandblasting is complete
Cheng Hou, with 40 DEG C of air scavenging medicament piece surface powders and material spray；
Medicament label face coat：Starch is soluble in water, it is sprayed on medicament piece surface, forms thickness for 0.05 millimeter
Coating.
Embodiment 2
Method according to embodiment 1 prepares soluble gadolinium base neutron poison medicament, unlike, in coarse fodder heat treatment step
It is 5-6 nitric hydrates gadolinium as coarse fodder to use average crystallite water, and fines is spread into fines on platform in fines drying steps
Thickness degree is 10 millimeters, 4 millimeters of the thickness (cylinder height) for the cylindrical medicament label being pressed into the moulding step of fines, directly
10 millimeters of footpath (cylinder basal diameter).
Embodiment 3
Method according to embodiment 1 prepares soluble gadolinium base neutron poison medicament, unlike, in coarse fodder heat treatment step
It is 3-4 hydrated sulfuric acids gadolinium as coarse fodder to use average crystallite water, and fines is spread into fines on platform in fines drying steps
Thickness degree is 5 millimeters, 5 millimeters of the thickness (cylinder height) for the cylindrical medicament label being pressed into the moulding step of fines, directly
12 millimeters of footpath (cylinder basal diameter).
Embodiment 4
Coarse fodder is heat-treated：It is 5-6 chloride hydrate gadolinium as coarse fodder to take 37.5kg average crystallites water, 50 DEG C of normal pressure,
Humidity makes to reach after thermal balance, maintained 20 minutes in the atmospheric environment less than 50%；
Cosolvent is added：Take 12.5kg sodium acid carbonates and ammonium carbonate mixture (weight ratio be 10:1) it is cosolvent, plus
Enter in the coarse fodder to after heat treatment；
Coarse fodder is ground：The coarse fodder added with cosolvent is ground using ball mill, reached to its particle diameters
500-600 microns, form fines；
Fines is dried：Obtain after fines, sprawled immediately on platform, thin thickness of feed layer is spread to for 5 millimeters, normal
35-40 DEG C of pressure, humidity are dried 60 minutes in the atmospheric environment less than 50%；
Fines is moulding：Fines after heat treatment is loaded into tablet press machine and is pressed into cylindrical medicament label, cylindrical medicament piece
4 millimeters of the thickness (cylinder height) of core, 10 millimeters of diameter (cylinder basal diameter), in tableting processes, ambient humidity is less than
5%, pressure 10MPa, are maintained 10-15 minutes；
Medicament label is surface-treated：After fines is moulding, craft or machine filter out complete without substantially incomplete geometry
Medicament piece, using sand-blasting machine treatment agent piece, forms rough surface, absolute roughness is between 0.01 to 0.05 millimeter, and sandblasting is complete
Cheng Hou, with 40 DEG C of air scavenging medicament piece surface powders and material spray；
Medicament label face coat：Starch is soluble in water, it is sprayed on medicament piece surface, it is 0.025 milli to form thickness
The coating of rice.
Embodiment 5
Method according to embodiment 4 prepares soluble gadolinium base neutron poison medicament, unlike, in coarse fodder heat treatment step
Use average crystallite water be 5-6 oxalic acid hydrates gadolinium as coarse fodder, use sodium acid carbonate 0.5kg in addition cosolvent step for hydrotropy
Particle diameters are ground in agent, coarse fodder grinding steps to reach fines in 600-800 microns, fines drying steps in platform
On be spread to thin thickness of feed layer for 5 millimeters, (cylinder is high for the thickness for the cylindrical medicament label being pressed into the moulding step of fines
Degree) 6 millimeters, 15 millimeters of diameter (cylinder basal diameter).
After measured, the medicament block being made by above-mentioned formula of the invention, shakes in frequency 5Hz, horizontal vibration amplitude 10mm shaking table
(consider that medicament block is impinging one another) after dynamic 1 hour, medicament block is still substantially complete；Medicament block is statically placed in the water of 100 times of quality itself
In, according to compositional difference, the time is completely dissolved between 20 to 180 minutes.
Above-described embodiment is for example, the present invention can also be with other ad hoc fashions or others to the present invention
Particular form is implemented, without departing from idea of the invention or substantive characteristics.Therefore, from the point of view of the embodiment of description is in terms of any
It is regarded as illustrative and non-limiting.The scope of the present invention should illustrate by appended claims, any and claim
Intention and the equivalent change of scope also should be within the scope of the present invention.
Claims (9)
1. a kind of soluble gadolinium base neutron poison medicament, it is characterised in that by label and even application containing gadolinium-based material in piece
The soluble coating of wicking surface is constituted, and the weight of gadolinium-based material is more than the 75% of medicament gross weight in label, the coating
Thickness is 0.01-0.1mm, the cosolvent in the label also containing the 1%-25% for accounting for medicament gross weight.
2. a kind of soluble gadolinium base neutron poison medicament according to claim 1, it is characterised in that the gadolinium-based material is
Chloride hydrate gadolinium, nitric hydrate gadolinium, hydrated sulfuric acid gadolinium or oxalic acid hydrate gadolinium；Formed the material of the soluble coating for starch,
Glycan, chitosan, PLA, polyethylene glycol or polylactic-co-glycolic acid.
3. a kind of soluble gadolinium base neutron poison medicament according to claim 1, it is characterised in that the cosolvent is carbon
Sour hydrogen sodium, ammonium carbonate or their mixture.
4. a kind of preparation method of soluble gadolinium base neutron poison medicament described in claim 1 or 2, comprises the following steps：
Coarse fodder is heat-treated：Gadolinium-based material is weighed as coarse fodder by proportioning, in the atmospheric environment of 50 DEG C of normal pressure, humidity less than 50%
Make to reach after thermal balance, maintain 20-60 minutes；
Coarse fodder is ground：Coarse fodder after heat treatment is ground, fines is formed；
Fines is dried：The fines of acquisition is placed on platform and sprawled, is dried；
Fines is moulding：Compressing tablet process is carried out to the fines after heat treatment, medicament label is obtained；
Medicament label is surface-treated：Satisfactory medicament label is filtered out, piece wicking surface is handled, coarse table is formed
Face, and remove the clout for remaining in piece wicking surface；
Medicament label face coat：Soluble material is coated in medicament piece wicking surface, the coating of thickness needed for being formed.
5. a kind of preparation method of soluble gadolinium base neutron poison medicament according to claim 4, it is characterised in that coarse fodder
In grinding steps, grinding makes the particle diameters of obtained fines reach 500-800 microns.
6. a kind of preparation method of soluble gadolinium base neutron poison medicament according to claim 4, it is characterised in that fines
In drying steps, fines is spread to thin thickness of feed layer for 1-10 millimeters, is less than 50% air in 35-40 DEG C of normal pressure, humidity
Dried 20-40 minutes in environment.
7. a kind of preparation method of soluble gadolinium base neutron poison medicament according to claim 4, it is characterised in that fines
In moulding step, the ambient humidity of tableting processes is less than 5%, pressure 10-15MPa, maintains 10-15 minutes.
8. a kind of preparation method of soluble gadolinium base neutron poison medicament according to claim 4, it is characterised in that medicament
In label surface treatment step, using sand-blasting machine carry out medicament label surface treatment, the rough surface formed it is absolute coarse
Degree is between 0.01-0.05 millimeters；Formed after rough surface, with the powder of 40 DEG C of air scavenging medicament label remained on surface and spray
Material.
9. according to a kind of preparation method of any described soluble gadolinium base neutron poison medicaments of claim 4-8, its feature exists
In, before coarse fodder grinding steps, the cosolvent for the 1-25% for accounting for medicament gross weight is added in the coarse fodder after heat treated, it is described
Cosolvent is sodium acid carbonate, ammonium carbonate or their mixture.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410836250.9A CN104599725B (en) | 2014-12-26 | 2014-12-26 | A kind of soluble gadolinium base neutron poison medicament and preparation method thereof |
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| CN201410836250.9A CN104599725B (en) | 2014-12-26 | 2014-12-26 | A kind of soluble gadolinium base neutron poison medicament and preparation method thereof |
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| CN104599725B true CN104599725B (en) | 2017-07-28 |
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| US3335063A (en) * | 1963-11-18 | 1967-08-08 | Gen Dynamics Corp | Multi-pyrocarbon coated nuclear fuel and poison particles and method of preparing same |
| JPH0980192A (en) * | 1995-09-08 | 1997-03-28 | Japan Atom Energy Res Inst | Criticality safety maintaining method for nuclear fuel reprocessing process with organic boron compound as soluble neutron poison or stable neutron absorber |
| JP2007033059A (en) * | 2005-07-22 | 2007-02-08 | Hitachi Ltd | Neutron shielding material and spent fuel storage cask |
| CN103021479B (en) * | 2012-11-27 | 2015-07-08 | 中国核电工程有限公司 | Movable nuclear material reactive inhibition system suitable for accident condition |
| CN103578589B (en) * | 2013-10-10 | 2016-02-24 | 中国核电工程有限公司 | A kind of neutron poison cladding particle with hot attachment characteristic |
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