CN115784721B - Aggregate for high-purity corundum refractory bricks and preparation method and application thereof - Google Patents
Aggregate for high-purity corundum refractory bricks and preparation method and application thereof Download PDFInfo
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- CN115784721B CN115784721B CN202211327783.5A CN202211327783A CN115784721B CN 115784721 B CN115784721 B CN 115784721B CN 202211327783 A CN202211327783 A CN 202211327783A CN 115784721 B CN115784721 B CN 115784721B
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- 239000011449 brick Substances 0.000 title claims abstract description 56
- 229910052593 corundum Inorganic materials 0.000 title claims abstract description 55
- 239000010431 corundum Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000005245 sintering Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 21
- 238000007598 dipping method Methods 0.000 claims abstract description 14
- 239000008247 solid mixture Substances 0.000 claims abstract description 14
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims abstract description 11
- 230000001070 adhesive effect Effects 0.000 claims abstract description 11
- 239000011819 refractory material Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 37
- 238000000498 ball milling Methods 0.000 claims description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000012798 spherical particle Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 8
- 239000003758 nuclear fuel Substances 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 238000007605 air drying Methods 0.000 claims description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000007711 solidification Methods 0.000 abstract description 4
- 230000008023 solidification Effects 0.000 abstract description 4
- 238000005469 granulation Methods 0.000 abstract description 3
- 230000003179 granulation Effects 0.000 abstract description 3
- 239000011230 binding agent Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007788 roughening Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000004901 spalling Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Abstract
The invention relates to an aggregate for high-purity corundum refractory bricks, and a preparation method and application thereof, and belongs to the technical field of refractory materials. The aggregate includes a solid mixture and a binder. Wherein, the solid mixture comprises the following components in percentage by weight: 85% -95% of corundum with the grain diameter of not less than 0.5mm, 4% -14% of alumina with the grain diameter of 5-150 mu m and 0.2% -1% of alumina with the grain diameter of 20-500 nm; the adhesive accounts for 0.1% -5% of the weight of the solid mixture. After the aggregate is subjected to grinding, coarsening treatment, gum dipping, granulation and sintering solidification, the alumina fine powder can be uniformly distributed around corundum particles, so that the combination property is improved, the generation of micro cracks and macro cracks in the sintering process is avoided, and further the compactness, normal-temperature flexural strength and high-temperature flexural strength of the refractory brick are improved. After the aggregate prepared by the invention is used for refractory bricks, the average room temperature flexural strength of the refractory bricks is 23.5MPa, and the average high temperature flexural strength of the refractory bricks is 8.9MPa, and compared with the traditional process, the aggregate is obviously improved. Meanwhile, the preparation method is simple, easy to operate and suitable for expanded production.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and relates to an aggregate for high-purity corundum refractory bricks, and a preparation method and application thereof.
Background
Compared with thermal power with high energy consumption and high pollution, nuclear energy is clean, efficient, inexhaustible and inexhaustible. The main way of human use of nuclear energy is to generate electricity through nuclear reactors, thereby being applied to social production and life. The walking beam sintering furnace is a high temperature sintering equipment designed for precisely controlling the temperature and sintering nuclear fuel pellets under the hydrogen condition. The nuclear fuel pellet sintering furnace has the operating temperature as high as 1750-1780 ℃, long continuous working time, no shutdown in 2-5 years under normal conditions, and the inside of the furnace adopts hydrogen as protective atmosphere, so that the requirement on the selection of refractory materials is very strict. At present, imported high-purity corundum refractory bricks are mainly used as refractory materials in nuclear fuel sintering furnaces at home and abroad, and the high-purity corundum refractory bricks have the advantages of high refractoriness, high-temperature strength, good chemical inertness and the like, so that the high-purity corundum refractory bricks become the best choice of refractory bricks for the nuclear fuel sintering furnaces. However, the kiln has the problems of low density, high impurity content, low normal-temperature flexural strength, low high-temperature flexural strength and the like, so that the conditions of chemical erosion, abnormal fracture, creep deformation and the like are easy to occur in the use process, the kiln is further damaged locally, and the nuclear fuel production line is stopped when the kiln is serious, so that the production progress is influenced.
In order to solve the problems of the high-purity corundum refractory bricks, the sintering performance of the high-purity corundum refractory bricks needs to be improved, and the key point of the improvement of the sintering performance is aggregate. According to practical experience and related technologies, the alumina fine powder which wraps the main skeleton of the aggregate is more uniformly distributed, the sphericity of the aggregate is higher, and the performance of the refractory brick is better, but the standard is difficult to reach in practical production. In addition, the aggregate sphericity used in actual production is poor, so that the aggregate particles are not densely filled, and gaps among irregular aggregate particles are overlarge; in addition, the alumina fine powder has large specific surface area and high surface activity, and is easy to agglomerate when mixed by utilizing the traditional mixing mode (ball milling and wheel milling), so that the alumina is unevenly distributed, and further, the destructive defects such as micro cracks, macro cracks and the like are generated due to stress concentration during compression molding. Therefore, in order to solve the problems that the alumina fine powder wrapping the main skeleton of the aggregate is difficult to disperse uniformly and the sphericity of the aggregate is low, thereby solving the problems of low normal-temperature flexural strength, low high-temperature flexural strength and the like of the high-purity corundum refractory brick, a novel aggregate for the high-purity corundum refractory brick and a preparation process thereof are necessary to be developed.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an aggregate for high-purity corundum refractory bricks; the second purpose of the invention is to provide a preparation method of the aggregate for the high-purity corundum refractory bricks; the invention further aims to provide an application of the aggregate for the high-purity corundum refractory brick in preparing a refractory material for a nuclear fuel sintering furnace.
In order to achieve the above purpose, the present invention provides the following technical solutions:
1. an aggregate for high-purity corundum refractory bricks, wherein the aggregate comprises a solid mixture and an adhesive;
the solid mixture comprises the following components in percentage by weight: 85% -95% of corundum with the grain diameter of not less than 0.5mm, 4% -14% of alumina with the grain diameter of 5-150 mu m and 0.2% -1% of alumina with the grain diameter of 20-500 nm;
the weight of the adhesive is 0.1% -5% of the weight of the solid mixture.
Preferably, the adhesive is any one or more of sodium metaaluminate, aluminum phosphate and aluminum hydroxide.
2. The preparation method of the aggregate for the high-purity corundum refractory brick comprises the following steps:
(1) And (3) grinding materials: mixing corundum with the particle size of not less than 0.5mm, alumina with the particle size of 5-150 mu m, alumina with the particle size of 20-500nm and deionized water to form a mixture, placing the mixture in a horizontal ball milling tank, and ball milling to obtain ball grinding materials, wherein the volume of the mixture is not more than 70% of that of the horizontal ball milling tank;
(2) Coarsening: immersing the ball milling material in the step (1) in sodium hydroxide solution with the concentration of 0.05-0.8mol/L for 2-24 hours, and filtering to obtain a mixed material;
(3) Dipping: adding an adhesive into the mixed material in the step (2), and fully stirring and mixing to obtain a sizing material;
(4) Granulating: granulating the gum dipping material in the step (3) in a granulator to obtain spherical particles;
(5) Sintering and solidifying: and (3) naturally air-drying the spherical particles in the step (4), transferring the spherical particles into a box furnace for sintering, and naturally cooling and solidifying the spherical particles after the sintering is completed to form the aggregate.
Preferably, the mass ratio of deionized water to solid mixture in step (1) is 20:1-40:1; the ball milling speed is 20-200r/min, and the ball milling time is 5-24h.
Preferably, the sintering in step (5) is carried out at a temperature of 450-1200 ℃ for a time of 5-24 hours.
3. The aggregate for the high-purity corundum refractory brick is applied to preparing refractory materials for nuclear fuel sintering furnaces.
The invention has the beneficial effects that: the invention discloses an aggregate for high-purity corundum refractory bricks. The aggregate includes a solid mixture and a binder. Wherein, the solid mixture comprises the following components in percentage by weight: 85% -95% of corundum with the grain diameter of not less than 0.5mm, 4% -14% of alumina with the grain diameter of 5-150 mu m and 0.2% -1% of alumina with the grain diameter of 20-500 nm; the weight of the adhesive is 0.1% -5% of the weight of the solid mixture. Corundum with the grain diameter of not less than 0.5mm is used as a framework support of the whole aggregate, and the sintering temperature of the high-purity corundum brick can be effectively reduced by adding alumina with the grain diameter of 5-150 mu m and fine powder with various grain diameters of alumina with the grain diameter of 20-500nm into the framework. The introduction of the adhesive promotes the corundum and the alumina fine powder to be firmly combined.
The invention also discloses a preparation method of the aggregate for the high-purity corundum refractory brick. The preparation method of the invention comprises 5 steps: abrasive material, roughening treatment, gum dipping, granulation and sintering solidification. The ball mill grinding material eliminates irregular sharp angles in the aggregate particles, improves sphericity of the aggregate, compacts the aggregate particles, increases fluidity of the aggregate particles, and avoids the problem of early failure of refractory bricks caused by concentration of stress at sharp angle positions in the use process; after coarsening treatment, the surface of the main aggregate skeleton becomes coarse, which is favorable for the adhesion of alumina micro-powder; in addition, sodium metaaluminate generated by slowly reacting the alumina fine powder with sodium hydroxide has certain tackiness, which is favorable for firmly adhering the aggregate framework and the alumina fine powder together; the alumina fine powder and the aggregate framework are further firmly combined through the processes of gum dipping, granulation and sintering solidification, so that the agglomeration of the alumina fine powder is avoided. The preparation method of the invention ensures that the alumina fine powder with two particle sizes can be uniformly distributed around the main framework in the aggregate, thus improving the combination property of the framework and the framework as well as the alumina fine powder with different particle sizes in the sintering process, avoiding the generation of microcracks and further being beneficial to improving the compactness, normal-temperature flexural strength and high-temperature flexural strength of the refractory brick. After the aggregate prepared by the preparation method is used for refractory bricks, the average room temperature flexural strength of the refractory bricks is 23.5MPa, and the average high temperature flexural strength of the refractory bricks is 8.9MPa, and compared with the traditional process, the aggregate is obviously improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a graph showing the morphology of corundum with a particle size of 2-3mm in example 1;
FIG. 2 is a graph showing the morphology of the mixture in step (2) of example 1;
FIG. 3 is a topography of the aggregate in step (5) of example 1;
FIG. 4 is a morphology graph of an aggregate prepared by a conventional preparation method in comparative example 1.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Example 1
An aggregate for high-purity corundum refractory bricks, which is prepared by the following steps:
(1) And (3) grinding materials: 900g of corundum with the grain diameter of 2-3mm, 95g of alumina with the grain diameter of 10 mu m, 5g of alumina with the grain diameter of 80nm and 20kg of deionized water are placed in a 10L horizontal ball milling tank, and ball milling is carried out for 12 hours under the condition that the ball milling rotating speed is 125r/min, so as to obtain ball grinding materials;
(2) Coarsening: immersing the ball milling material in the step (1) in sodium hydroxide solution with the concentration of 0.1mol/L, fully soaking for 10 hours, and filtering to obtain a mixed material;
(3) Dipping: adding 10g of aluminum phosphate into the mixed material in the step (2), and fully stirring and mixing to obtain a sizing material;
(4) Granulating: granulating the gum dipping material in the step (3) in a granulator to obtain spherical particles;
(5) Sintering and solidifying: and (3) naturally airing the spherical particles in the step (4), transferring the spherical particles to a box furnace, sintering for 8 hours at 600 ℃, and naturally cooling and solidifying after the sintering is finished to form aggregate.
Example 2
An aggregate for high-purity corundum refractory bricks, which is prepared by the following steps:
(1) And (3) grinding materials: 950g of corundum with the grain diameter of 3-5mm, 40g of alumina with the grain diameter of 5 mu m, 10g of alumina with the grain diameter of 20nm and 25kg of deionized water are placed in a 10L horizontal ball milling tank, and ball milling is carried out for 5 hours under the condition of the ball milling rotating speed of 200r/min to obtain ball grinding materials;
(2) Coarsening: immersing the ball milling material in the step (1) in sodium hydroxide solution with the concentration of 0.8mol/L, fully soaking for 2 hours, and filtering to obtain a mixed material;
(3) Dipping: adding 50g of aluminum phosphate into the mixed material in the step (2), and fully stirring and mixing to obtain a sizing material;
(4) Granulating: granulating the gum dipping material in the step (3) in a granulator to obtain spherical particles;
(5) Sintering and solidifying: and (3) naturally airing the spherical particles in the step (4), transferring the spherical particles to a box furnace, sintering for 24 hours at the temperature of 450 ℃, and naturally cooling and solidifying after the sintering is finished to form the aggregate.
Example 3
An aggregate for high-purity corundum refractory bricks, which is prepared by the following steps:
(1) And (3) grinding materials: 850g of corundum with the grain diameter of 5-8mm, 140g of alumina with the grain diameter of 150 mu m, 10g of alumina with the grain diameter of 500nm and 40kg of deionized water are placed in a 10L horizontal ball milling tank, and ball milling is carried out for 8 hours under the condition that the ball milling rotating speed is 180r/min, so as to obtain ball grinding materials;
(2) Coarsening: immersing the ball milling material in the step (1) in sodium hydroxide solution with the concentration of 0.05mol/L, fully soaking for 24 hours, and filtering to obtain a mixed material;
(3) Dipping: adding 1g of aluminum phosphate into the mixed material in the step (2), and fully stirring and mixing to obtain a sizing material;
(4) Granulating: granulating the gum dipping material in the step (3) in a granulator to obtain spherical particles;
(5) Sintering and solidifying: and (3) naturally airing the spherical particles in the step (4), transferring the spherical particles to a box furnace, sintering for 6 hours at 1200 ℃, and naturally cooling and solidifying after the sintering is finished to form aggregate.
Comparative example 1
The procedure of (2) to (5) in example 1 was removed, and the remaining steps were unchanged.
Comparative example 2
The procedure of (2) to (5) in example 2 was removed, and the remaining steps were unchanged.
Comparative example 3
The procedure of (2) to (5) in example 3 was removed, and the remaining steps were unchanged.
FIG. 1 is a morphology diagram of corundum with a particle size of 2-3mm in example 1, and the irregular shape and smoother surface can be seen from FIG. 1. Therefore, in order to increase the adhesion of the alumina fine powder to the surface thereof, it is necessary to perform a roughening treatment step; fig. 2 is a morphology diagram of the mixed material in step (2) in example 1, and it can be seen from fig. 2 that after the abrasive and roughening treatment procedures, the particle size of corundum remains unchanged basically, but the sphericity is improved remarkably, and a layer of fine particles, namely alumina micro-powder, is adhered to the surface of corundum obviously, but the distribution of the fine particles is uneven; FIG. 3 is a morphology diagram of the aggregate in step (5) in example 1, and it can be seen from FIG. 3 that after 5 processes, particles with a size of about 5-20mm are formed in the prepared aggregate, wherein alumina fine powder is uniformly distributed in the middle of corundum, so that ideal dispersion condition is obtained, thereby being beneficial to improving compactness and sintering strength of the refractory brick, reducing spalling defect of the high-purity corundum refractory brick and improving high yield; fig. 4 is a morphology diagram of the aggregate prepared by the conventional preparation method in comparative example 1, and it can be seen from fig. 4 that the corundum and alumina fine powder are very unevenly distributed, and the alumina fine powder is mostly aggregated on the outermost layer of the corundum particles, so that the importance of roughening, dipping, granulating and sintering solidification processes can be illustrated, thereby also illustrating the superiority of the preparation method of the present invention.
Similarly, the aggregate in examples 2-3 was subjected to the morphology test as in example 1 above, and the test results showed that the corundum particle size in the aggregate remained substantially unchanged after the abrasive, roughening treatment, gumming, granulating, curing and sintering procedures, but the sphericity was significantly improved. The alumina fine powder can be uniformly distributed in the middle of corundum, so that ideal dispersion condition is obtained.
In order to better illustrate the superiority of the aggregate for the high-purity corundum refractory bricks and the preparation method thereof, the invention prepares 16 high-purity corundum refractory bricks for nuclear industry to be divided into two groups for carrying out control experiments, wherein the aggregate of the 8 refractory bricks in the group A is prepared by the invention, and the aggregate of the 8 refractory bricks in the group B adopts the old process. The number of cracks, the average room temperature flexural strength, the average high temperature flexural strength and the average apparent porosity of the refractory bricks in the two groups of experiments were tested under the same conditions, and the experimental results are shown in table 1.
Table 1 comparison of Performance tests on various aspects of refractory bricks in two experiments
Table 1 is a comparison of performance tests for various aspects of an aggregate-pressed refractory brick made according to the present invention and an aggregate-pressed refractory brick made according to conventional techniques. As can be seen from Table 1, the refractory bricks prepared from the aggregate according to the present invention have a remarkable improvement in average room temperature flexural strength and average high temperature flexural strength as compared with the refractory bricks prepared from the aggregate according to the conventional process; the surface of the refractory brick is smooth, and the air hole content is low; since the spalling does not occur basically, chemical attack, abnormal fracture, creep deformation and the like are not easy to occur in the use process.
In conclusion, the invention discloses an aggregate for high-purity corundum refractory bricks, and a preparation method and application thereof. The corundum is used as the skeleton support of the whole aggregate in the aggregate, and the sintering temperature of the high-purity corundum brick can be effectively reduced by adding alumina micro-powder with various particle sizes into the skeleton. After the aggregate prepared by the preparation method is used for refractory bricks, the average room temperature flexural strength and the average high temperature flexural strength of the refractory bricks are obviously improved compared with the traditional process, and chemical erosion, abnormal fracture, creep deformation and the like are not easy to occur in the use process because the aggregate is basically not subjected to spalling.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (5)
1. A preparation method of aggregate for high-purity corundum refractory bricks is characterized by comprising the following steps: the aggregate comprises a solid mixture and an adhesive;
the solid mixture comprises the following components in percentage by weight: 85% -95% of corundum with the grain diameter of not less than 0.5mm, 4% -14% of alumina with the grain diameter of 5-150 mu m and 0.2% -1% of alumina with the grain diameter of 20-500 nm;
the weight of the adhesive is 0.1% -5% of the weight of the solid mixture;
the aggregate is prepared by the following steps:
(1) And (3) grinding materials: mixing corundum with the particle size of not less than 0.5mm, alumina with the particle size of 5-150 mu m, alumina with the particle size of 20-500nm and deionized water to form a mixture, placing the mixture in a horizontal ball milling tank, and ball milling to obtain ball grinding materials, wherein the volume of the mixture is not more than 70% of that of the horizontal ball milling tank;
(2) Coarsening: immersing the ball milling material in the step (1) in sodium hydroxide solution with the concentration of 0.05-0.8mol/L for 2-24 hours, and filtering to obtain a mixed material;
(3) Dipping: adding an adhesive into the mixed material in the step (2), and fully stirring and mixing to obtain a sizing material;
(4) Granulating: granulating the gum dipping material in the step (3) in a granulator to obtain spherical particles;
(5) Sintering and solidifying: and (3) naturally air-drying the spherical particles in the step (4), transferring the spherical particles into a box furnace for sintering, and naturally cooling and solidifying the spherical particles after the sintering is completed to form the aggregate.
2. The method for preparing the aggregate for the high-purity corundum refractory bricks according to claim 1, which is characterized by comprising the following steps: the adhesive is any one or more of sodium metaaluminate, aluminum phosphate and aluminum hydroxide.
3. The method for preparing the aggregate for the high-purity corundum refractory bricks according to claim 1, which is characterized by comprising the following steps: the mass ratio of the deionized water to the solid mixture in the step (1) is 20:1-40:1; the ball milling speed is 20-200r/min, and the ball milling time is 5-24h.
4. The method for preparing the aggregate for the high-purity corundum refractory bricks according to claim 1, which is characterized by comprising the following steps: the sintering temperature in the step (5) is 450-1200 ℃ and the sintering time is 5-24h.
5. Use of the aggregate for high-purity corundum refractory bricks prepared by the method according to any one of claims 1 to 4 in the preparation of refractory materials for nuclear fuel sintering furnaces.
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| CN113072364A (en) * | 2021-03-22 | 2021-07-06 | 中冶武汉冶金建筑研究院有限公司 | Lightweight refractory castable for blast furnace swinging chute and preparation method thereof |
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| CN107488049A (en) * | 2017-08-21 | 2017-12-19 | 李楠 | A kind of Al2O3‑SiO2The spherical lightweight refracrory aggregate of matter |
| CN113072364A (en) * | 2021-03-22 | 2021-07-06 | 中冶武汉冶金建筑研究院有限公司 | Lightweight refractory castable for blast furnace swinging chute and preparation method thereof |
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