Sagger repair slurry and preparation method therefor, sagger, and sagger repair method

Abstract

The present application provides a sagger repair slurry and a preparation method therefor, a saggar, and a sagger repair method. The sagger repair slurry comprises solid components and liquid components, the solid components comprise a base material and clay, and the liquid components comprise a binder and water. The base material is at least one of aluminum oxide, mullite, cordierite, spinel, and a crushed sagger material. The solid content in the sagger repair slurry is 15% to 25%, the particle size of the sagger repair slurry is less than 5 μm, and the sagger repair slurry is used for soaking a scrapped sagger. The sagger repair slurry can be used to repair scrapped saggers to reduce the amount of scrapped saggers, that is, the recycling rate of the scrapped saggers is increased, so that the service life of saggers can be prolonged, and the preparation costs of positive electrode materials can be reduced.

Description

The present application relates to the technical field of lithium batteries and, especially, to a saggar repair slurry and a preparation method therefor, a saggar, and a saggar repair method. BACKGROUND When used for producing positive electrode materials, the saggar has its maximum number of times for repeated use. After used for the maximum number of times, the saggar will be scrapped. Generally, the overall appearance of the saggar being scrapped, that is, a scrap saggar, barely changes. However, damage such as corrosion, cracks, or peeling is caused to the inner walls of most scrap saggars. For example, when the saggars are used for producing ternary 811 positive electrode materials of lithium batteries, the saggars are generally scrapped after used for 20 to 30 cycles so that the production workshop of the positive electrode materials of the lithium batteries generates a large number of scrap saggars daily. According to statistics, the use cost of the saggars is about 10% to 20% of the processing cost of the positive electrode materials of the lithium batteries. Moreover, a large amount of harmful metal is permeated into the scrap saggar and difficult to be dealt with. Therefore, most manufacturers put scrap saggars into storage, increasing a burden of storage, or transfer scrap saggars to related certified companies by paying a certain fee, increasing a hidden cost for producing the lithium batteries. Therefore, how to extend the service life of the saggar, reduce the number of scrap saggars generated, and develop a suitable method for treating scrap and old saggars becomes a difficulty in reducing the production cost of a positive electrode material and is of great significance to the production and technical progress of positive electrode materials of lithium-ion batteries. SUMMARY The following is a summary of the subject detailed in this disclosure. The summary is not intended to limit the protection scope of the claims. To overcome the shortcomings in the related art, the present application provides a saggar repair slurry and a preparation method therefor, a saggar, and a saggar repair method, and the saggar repair slurry and the preparation method therefor can repair a scrap saggar to reduce the number of scrap saggars generated, that is, to improve the reuse rate of scrap saggars so that the service life of the saggar can be extended and the preparation cost of a positive electrode material can be reduced. The present application adopts the technical solutions described below. A saggar repair slurry includes a solid component and a liquid component, where the solid component includes a matrix and clay and the liquid component includes an adhesive and water. The matrix is at least one of aluminum oxide, mullite, cordierite, spinel, and a crushed saggar material. The saggar repair slurry has a solid content of 15% to 25% and a particle size of less than 5 pm and is used for immersing a scrap saggar. In an embodiment, the saggar repair slurry includes the following components in parts by mass: 50 parts to 60 parts of matrix; 5 parts to 10 parts of clay; 1 part to 1.5 parts of adhesive; and the remaining parts of water. In an embodiment, the matrix has a particle size of 0.1 pm to 5 pm. In an embodiment, the clay has a particle size of less than 5 pm. In an embodiment, the matrix includes mullite and the crushed saggar material. In an embodiment, the adhesive is at least one of polyurethane and polyacrylamide. A method for preparing the saggar repair slurry in any one of the preceding embodiments includes the steps of: acquiring a matrix, clay, and an adhesive; mixing the matrix, the clay, and the adhesive to obtain a mixture; and stirring and diluting the mixture with water to obtain the saggar repair slurry. In an embodiment, the mixture is stirred and diluted with water at a stirring rate of 1000 r / min to 1500 r / min. In an embodiment, the saggar repair slurry has a viscosity of less than 350 cP. A saggar repair method includes the steps of: acquiring a scrap saggar and the saggar repair slurry in any one of the preceding embodiments; scraping a surface of the scrap saggar to remove an easily detached peeling layer on the surface of the scrap saggar; impregnating the scrap saggar with the surface scraped with the saggar repair slurry to obtain a pre-repaired saggar; subjecting the pre-repaired saggar to overturned standing to remove the saggar repair slurry which is flowable on a surface of the pre-repaired saggar; and performing heat treatment on the pre-repaired saggar after the overturned standing. In an embodiment, impregnating the scrap saggar with the surface scraped with the saggar repair slurry includes: subjecting the scrap saggar with the surface scraped to stacking treatment by using an impregnation tank so that the scrap saggars are stacked in the impregnation tank; injecting the saggar repair slurry into the impregnation tank and sealing and vacuumizing the impregnation tank; and performing ultrasonic impregnation on the scrap saggar after the sealing and vacuumizing. A saggar is repaired by the saggar repair method in any one of the preceding embodiments. Compared with the related art, the present application has at least the advantages below. In the saggar repair slurry of the present application, the matrix, the clay, the adhesive, and water are combined to prepare the saggar repair slurry for immersing the scrap saggar, and the saggar repair slurry has a solid content of 15% to 25%, thereby ensuring the fluidity of the saggar repair slurry and relatively well ensuring the impregnation effect of the saggar repair slurry on the whole scrap saggar. Additionally, the saggar repair slurry has a particle size of less than 5 pm, ensuring the permeability of the saggar repair slurry into the cracks of the scrap saggar, and that is, ensuring that the saggar repair slurry can permeate into the cracks of the scrap saggar to fill and level the cracks of the scrap saggar. Additionally, the matrix is at least one of aluminum oxide, mullite, cordierite, spinel, and the crushed saggar material and combined with the clay, the adhesive, and water to prepare the slurry for repairing the scrap saggar so that the high bonding strength of the saggar repair slurry on the surface of the scrap saggar after the heat treatment on the scrap saggar is achieved relatively stably, and the structural strength of the scrap saggar after the heat treatment is enhanced, that is, the repair effect of the scrap saggar is ensured relatively well. As a result, not only is the scrap saggar repaired to reduce the number of scrap saggars generated, but also the service life of the repaired scrap saggar is extended, thereby effectively improving the reuse rate of scrap saggars, extending the service life of the saggar, and reducing the preparation cost of the positive electrode material. Other aspects can be understood upon reading and perceiving the drawings and detailed description. BRIEF DESCRIPTION OF DRAWINGS To illustrate the technical solutions in embodiments of the present application more clearly, the drawings used in the embodiments are briefly described below. It is to be understood that the drawings merely illustrate some embodiments of the present application and are not to be construed as limiting the scope. Those of ordinary skill in the art may obtain other relevant drawings based on these drawings without creative work. FIG. 1 is a flowchart of a method for preparing a saggar repair slurry according to an embodiment of the present application; FIG. 2 is a flowchart of a saggar repair method according to an embodiment of the present application; FIG. 3 shows a scrap saggar used 22 times; and FIG. 4 shows a repaired scrap saggar. DETAILED DESCRIPTION To facilitate the understanding of the present application, a more complete description of the present application is provided below with reference to the drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided for a more thorough and complete understanding of the content disclosed in the present application. It is to be noted that when a component is described as being “fixed to” another component, it may be directly fixed on the particular component or fixed through an intervening component. When a component is described as being “connected to” another component, it may be directly connected to the particular component or connected through an intervening component. The terms used herein, such as “vertical”, “horizontal”, “left”, and “right”, are only used for an illustrative purpose and do not mean that it is the only embodiment. Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application pertains. Terms used in the description of the present application are only used for describing embodiments and are not intended to limit the present application. The term “and / or” used herein includes any or all combinations of one or more listed associated items. The present application provides a saggar repair slurry. The saggar repair slurry includes a solid component and a liquid component, where the solid component includes a matrix and clay and the liquid component includes an adhesive and water. The matrix is at least one of aluminum oxide, mullite, cordierite, spinel, and a crushed saggar material. The saggar repair slurry has a solid content of 15% to 25% and a particle size of less than 5 pm and is used for immersing a scrap saggar. In the preceding saggar repair slurry, the matrix, the clay, the adhesive, and water are combined to prepare the saggar repair slurry for immersing the scrap saggar, and the saggar repair slurry has a solid content of 15% to 25%, thereby ensuring the fluidity of the saggar repair slurry and relatively well ensuring the impregnation effect of the saggar repair slurry on the whole scrap saggar. Additionally, the saggar repair slurry has a particle size of less than 5 pm, ensuring the permeability of the saggar repair slurry into the cracks of the scrap saggar, and that is, ensuring that the saggar repair slurry can permeate into the cracks of the scrap saggar to fill and level the cracks of the scrap saggar. Additionally, the matrix is at least one of aluminum oxide, mullite, cordierite, spinel, and the crushed saggar material and combined with the clay, the adhesive, and water to prepare the slurry for repairing the scrap saggar so that the high bonding strength of the saggar repair slurry on the surface of the scrap saggar after heat treatment on the scrap saggar is achieved relatively stably, and the structural strength of the scrap saggar after the heat treatment is enhanced, that is, the repair effect of the scrap saggar is ensured relatively well. As a result, not only is the scrap saggar repaired to reduce the number of scrap saggars generated, but also the service life of the repaired scrap saggar is extended, thereby effectively improving the reuse rate of scrap saggars, extending the service life of the saggar, and reducing the preparation cost of a positive electrode material. In an embodiment, the crushed saggar material is powder obtained by further crushing saggar powder scraped off from the surface of the scrap saggar. It is to be understood that the crushed saggar material is a substance that has been subjected to the heat treatment, and has relatively small hardness and stability as well as the same nature as the scrap saggar, which can be attached and fdled into the cracks of the scrap saggar relatively stably, further ensuring the repair effect of the scrap saggar. In an embodiment, the matrix includes the crushed saggar material and mullite. It is to be understood that both the crushed saggar material and mullite are stable, mullite has relatively high structural strength, and the crushed saggar material has the same nature as the scrap saggar so that the crushed saggar material and mullite are used together as the matrix and combined with the clay and the adhesive to form the saggar repair slurry and repair the scrap saggar, ensuring the stability with which the saggar repair slurry is attached and filled into the cracks of the scrap saggar, effectively improving the reuse rate of scrap saggars, ensuring that the repaired scrap saggar has relatively high structural strength, and further extending the service life of the repaired scrap saggar. In an embodiment, a mass ratio of the crushed saggar material to mullite is 1:(1.5^3). It is to be understood that the mass ratio of the crushed saggar material to mullite is 1:(1.5^3) so that in the case where the stability with which the saggar repair slurry is attached and filled into the scrap saggar is ensured, the structural strength of the repaired scrap saggar is effectively enhanced and the service life of the scrap saggar is extended relatively well. In an embodiment, before the saggar powder is scraped off from the surface of the scrap saggar, the surface of the scrap saggar is cleaned with air to remove the positive electrode material on the surface of the scrap saggar. In an embodiment, after the saggar powder is scraped off from the surface of the scrap saggar, the saggar powder is cleaned with air to remove the positive electrode material on the surface of the saggar powder. In an embodiment, the scrap saggar is a saggar with a rough and scratched surface. In an embodiment, the saggar repair slurry includes the following components in parts by mass: 50 parts to 60 parts of matrix, 5 parts to 10 parts of clay, 1 part to 1.5 parts of adhesive, and the remaining parts of water, ensuring that the saggar repair slurry has relatively good fluidity and can easily enter the cracks of the scrap saggar and relatively well ensuring the stability with which the saggar repair slurry is attached and filled into the cracks of the scrap saggar. Thus, the scrap saggar can achieve a relatively good repair effect and the repaired scrap saggar has relatively high structural strength, relatively well extending the service life of the repaired scrap saggar. In an embodiment, the matrix has a particle size of 0.1 pm to 5 pm, relatively well ensuring that the matrix in the saggar repair slurry can be smoothly attached and filled into the cracks of the scrap saggar and ensuring the repair effect of the scrap saggar. In an embodiment, the clay has a particle size of less than 5 pm, relatively well ensuring that the clay in the saggar repair slurry can be smoothly attached and filled into the cracks of the scrap saggar and ensuring the repair effect of the scrap saggar. In an embodiment, the adhesive is at least one of polyurethane and polyacrylamide, relatively well ensuring the adhesion strength of the saggar repair slurry to the clacks and surface of the scrap saggar and ensuring the repair effect of the scrap saggar. The present application also provides a method for preparing the saggar repair slurry in any one of the preceding embodiments. To better understand the method for preparing the saggar repair slurry of the present application, the method for preparing the saggar repair slurry of the present application is further explained and illustrated below. The method for preparing the saggar repair slurry in an embodiment includes part or all of the steps described below. In S100, a matrix, clay, and an adhesive are acquired. It is to be understood that the matrix is at least one of aluminum oxide, mullite, cordierite, spinel, and a crushed saggar material; the matrix is at least one of aluminum oxide, mullite, cordierite, spinel, and the crushed saggar material and combined with the clay, the adhesive, and water to prepare the slurry for repairing the scrap saggar, so that the high bonding strength of the saggar repair slurry on the surface of the scrap saggar after the heat treatment on the scrap saggar is achieved relatively stably, and the structural strength of the scrap saggar after the heat treatment can be enhanced, that is, the repair effect of the scrap saggar can be ensured relatively well. Therefore, the matrix, the clay, and the adhesive are acquired to prepare the saggar repair slurry for immersing and repairing the scrap saggar, so as to repair the scrap saggar. In S200, the matrix, the clay, and the adhesive are mixed to obtain a mixture. It is to be understood that the clay, i.e., sticky earth, is sticky soil including a small amount of sand, and the clay has relatively good plasticity since it is difficult for water to pass through; and the adhesive is a substance having relatively good bonding performance and connects objects by bonding their surfaces through adhesion and cohesion. If the matrix, the clay, and the adhesive are directly diluted and mixed in water, the clay, the matrix, and the adhesive will be mixed with relatively poor uniformity even at a relatively high stirring speed. Thus, in order to prepare the slurry, the matrix, the clay, and the adhesive are mixed firstly so that the matrix, the clay, and the adhesive are uniformly mixed and dispersed in a physical kneading manner or in a stirring and mixing manner, thereby facilitating the uniform dispersion of the matrix, the clay, and the adhesive in the saggar repair slurry. In S300, the mixture is stirred and diluted with water to obtain the saggar repair slurry. It is to be understood that the mixture is stirred and diluted with water after the matrix, the clay, and the adhesive are mixed uniformly, facilitating the uniform dispersion of the matrix, the clay, and the adhesive in water, relatively well preparing the saggar repair slurry having relatively good dispersion uniformity, and ensuring the repair effect of the saggar repair slurry on the scrap saggar. In the preceding method for preparing the saggar repair slurry, the matrix, the clay, and the adhesive are acquired to prepare the saggar repair slurry for immersing and repairing the scrap saggar, so as to achieve a relatively good repair effect of the scrap saggar; the matrix, the clay, and the adhesive are mixed firstly to prepare the slurry so that the matrix, the clay, and the adhesive are uniformly mixed and dispersed in the physical kneading manner or in the stirring and mixing manner; and then the mixture is stirred and diluted with water, facilitating the uniform dispersion of the matrix, the clay, and the adhesive in water, relatively well preparing the saggar repair slurry having relatively good dispersion uniformity, and ensuring the repair effect of the saggar repair slurry on the scrap saggar. In an embodiment, the mixture is stirred and diluted with water, which specifically includes that the mixture is stirred and diluted multiple times with small amounts of water, that is, the mixture is stirred and diluted in a dough kneading manner. It is to be understood that since the clay is difficult for water to pass through, if relatively much water is added at one time, local clay is wetted with water and the matrix, the clay, and / or the adhesive coated by the local clay are relatively difficult to be in contact with water and form a uniform slurry. As a result, the matrix, the clay, and the adhesive are relatively difficult to form, in water, a fine slurry with relatively good uniformity and improve the repair effect of the scrap saggar. Therefore, in the present application, the mixture is stirred and diluted multiple times with small amounts of water. The mixture is stirred and diluted in a manner similar to “dough kneading”, that is, water is added to the mixture portion-wise and the mixture is stirred and mixed in the manner similar to “dough kneading” so that the mixture is gradually wetted and mixed uniformly, relatively well ensuring the dispersion uniformity of the mixture in water, ensuring the fineness of the saggar repair slurry, and achieving a relatively good repair effect of the saggar repair slurry on the scrap saggar. In an embodiment, the mixture is stirred and diluted multiple times with small amounts of water, which specifically includes the following steps: an addition amount of water is acquired; the mixture is added with 10% to 15% of water and stirred and diluted for the first time; the mixture stirred and diluted once is added with 20% to 25% of water and stirred and diluted for the second time; the mixture stirred and diluted twice is added with 40% to 60% of water and stirred and diluted for the third time; and the mixture stirred and diluted three times is added with the remaining water and stirred and diluted for the fourth time. It is to be understood that although the clay, the adhesive, and the matrix in the mixture are already mixed relatively uniformly before water is added to the mixture for the first time, relatively much local clay is unwetted and if too much water is added, the local clay is wetted immediately, affecting the internal permeation of the clay wetted by an aqueous phase and affecting the dispersion uniformity of the saggar repair slurry. Therefore, when the water is added for the first time, only a small amount of water needs to be added to wet and disperse the mixture, that is, only 10% to 15% of water is added to wet and disperse the mixture, relatively well ensuring the dispersion uniformity of the mixture in water. Furthermore, before water is added to the mixture again, relatively much unwetted clay is still distributed uniformly in the mixture. If all water or relatively much water is added to the mixture, local clay still will be wetted immediately, affecting the internal permeation of the clay wetted by an aqueous phase and affecting the dispersion uniformity of the saggar repair slurry. That is to say, an amount of water to be added still needs to be controlled. Considering the preparation efficiency of the saggar repair slurry, when water is added to the mixture again, only 20% to 25% of water is added, ensuring the dispersion uniformity of the saggar repair slurry and the preparation efficiency of the saggar repair slurry. Similarly, to further ensure the dispersion uniformity and the preparation efficiency of the saggar repair slurry, the remaining water is controlled to be added in two portions, namely, 40% to 60% of water and the remaining water, relatively well ensuring the preparation efficiency of the saggar repair slurry and the repair effect of the saggar repair slurry on the scrap saggar. In an embodiment, the mixture is stirred and diluted with water at a stirring rate of 1000 r / min to 1500 r / min. It is to be understood that a stirring speed is related to the mixing effect of the mixture. If the stirring speed is relatively low, the mixture is relatively difficult to be uniformly wetted with water and form a uniform slurry, and the preparation efficiency of the saggar repair slurry is reduced. If the stirring speed is too high, the matrix and the clay with relatively small particle sizes float as dust, causing dust pollution, affecting the ratio of the substances in the saggar repair slurry, and thereby affecting the repair effect of the saggar repair slurry on the scrap saggar. In an embodiment, the mixture is stirred and diluted with water for a stirring time of 1 h to 2 h. It is to be understood that in the case where a stirring rate is 1000 r / min to 1500 r / min, the mixture is stirred and diluted with water for a stirring time of 1 h to 2 h, relatively well ensuring the dispersion uniformity of the saggar repair slurry. In an embodiment, the saggar repair slurry has a viscosity of less than 350 cP, relatively well ensuring the fluidity of the saggar repair slurry, the strength with which the saggar repair slurry is filled and attached into the cracks of the scrap saggar, and the strength with which the saggar repair slurry is attached to the surface of the scrap saggar, and then relatively well ensuring the repair effect of the saggar repair slurry on the scrap saggar. Furthermore, in the present application, the viscosity is determined by using a Brookfield rotary viscometer. In an embodiment, the saggar repair slurry has a viscosity of 150 cP to 250 cP, better ensuring the fluidity of the saggar repair slurry, the strength with which the saggar repair slurry is filled and attached into the cracks of the scrap saggar, and the strength with which the saggar repair slurry is attached to the surface of the scrap saggar, and then better ensuring the repair effect of the saggar repair slurry on the scrap saggar. The present application also provides a saggar repair method. To better understand the saggar repair method of the present application, the saggar repair method of the present application is further explained and illustrated below. The saggar repair method in an embodiment includes part or all of the steps described below. In SI 0, a scrap saggar and the saggar repair slurry in any one of the preceding embodiments are acquired. It is to be understood that although the saggar repair slurry has a relatively good repair effect on the scrap saggar, if the saggar repair slurry is used by an inappropriate method or the saggar repair slurry is used by different methods, the scrap saggar is repaired with different strength effect. Therefore, in the present application, to maximize the repair effect of the saggar repair slurry on the scrap saggar, the scrap saggar and the saggar repair slurry are acquired for the subsequent operations. In S20, a surface of the scrap saggar is scraped to remove an easily detached peeling layer on the surface of the scrap saggar. It is to be understood that a residue of a positive electrode material exists on the surface of the scrap saggar and the scrap saggar itself has relatively many cracks and an easily detached surface layer; if the scrap saggar is directly repaired, no matter what method is adopted to repair the scrap saggar, the repair effect of the scrap saggar is affected and so the saggar repair slurry has a relatively poor repair effect on the scrap saggar. Therefore, the surface of the scrap saggar is scraped to remove the easily detached peeling layer on the surface of the scrap saggar, relatively well ensuring the repair effect of the saggar repair slurry on the scrap saggar. In S30, the scrap saggar with the surface scraped is impregnated with the saggar repair slurry to obtain a pre-repaired saggar. It is to be understood that generally, the scrap saggar is mostly repaired by being directly coated, and when the scrap saggar is repaired by being coated, the fluidity of the saggar repair slurry needs to be controlled, that is, the fluidity of the saggar repair slurry needs to be reduced, so as to ensure the adhesion of the saggar repair slurry to the surface of the scrap saggar; in this manner, the saggar repair slurry is more likely to be directly attached to the surface of the scrap saggar, that is, the saggar repair slurry is relatively difficult to permeate into the cracks of the scrap saggar; thus, when the scrap saggar is repaired by being coated, the surface of the scrap saggar needs to be polished to a relatively large degree and the saggar needs to be coated with the saggar repair slurry multiple times to ensure the overall thickness and strength of the scrap saggar, requiring a relatively large amount of work; moreover, if the cracks of the scrap saggar are relatively deep and are not removed when the scrap saggar is polished, since the saggar repair slurry is relatively difficult to permeate into the cracks of the scrap saggar, the cracks of the scrap saggar still exist and the scrap saggar will be scrapped again relatively quickly when the scrap saggar is put into use again, that is, the repair effect is relatively poor and the service life of the repaired saggar is relatively short. Therefore, in the present application, the saggar repair slurry with relatively good fluidity is used and the scrap saggar is repaired by being impregnated with the saggar repair slurry. On the one hand, the degree to which the surface of the scrap saggar is polished is reduced so that the overall thickness and strength of the scrap saggar can be ensured by simply forming a repair layer with a relatively small thickness on the surface of the scrap saggar. On the other hand, even when the surface of the scrap saggar is polished to a relatively small degree and there are still relatively many cracks on the surface of the scrap saggar, the saggar repair slurry can permeate into the cracks of the scrap saggar relatively well and be attached and filled into the cracks of the scrap saggar relatively well so that even when the scrap saggar is polished to a relatively small degree, the repair effect of the scrap saggar is improved relatively well and the service life of the repaired scrap saggar is ensured relatively well. In S40, the pre-repaired saggar is subjected to overturned standing to remove the saggar repair slurry which is flowable on a surface of the pre-repaired saggar. It is to be understood that after the scrap saggar is impregnated with the saggar repair slurry, lots of the saggar repair slurry is attached to the surface of the scrap saggar in a flowable manner when the scrap saggar is taken out and if the scrap saggar is directly subjected to heat treatment after being taken out, many flow lines appear on the surface of the scrap saggar, affecting the use of the scrap saggar. Therefore, in the present application, the pre-repaired saggar is subjected to overturned standing to remove the saggar repair slurry which is flowable on the surface of the pre-repaired saggar, relatively well ensuring the surface flatness of the scrap saggar during the heat treatment. It is also to be understood that if the scrap saggar taken out is placed with its top side up to remove the saggar repair slurry flowable on the surface of the pre-repaired saggar, relatively much saggar repair slurry is accumulated in the scrap saggar and the internal flatness of the scrap saggar after the heat treatment is relatively poor, affecting the use of the scrap saggar. In S50, the heat treatment is performed on the pre-repaired saggar after the overturned standing so that the scrap saggar is repaired relatively well. In the preceding saggar repair method, the scrap saggar and the saggar repair slurry are acquired to maximize the repair effect of the saggar repair slurry on the scrap saggar in the subsequent process. Next, the saggar repair slurry with relatively large fluidity is used and the scrap saggar is repaired by being impregnated with the saggar repair slurry. On the one hand, the degree to which the surface of the scrap saggar is polished is reduced so that the overall thickness and strength of the scrap saggar can be ensured by simply forming the repair layer with a relatively small thickness on the surface of the scrap saggar. On the other hand, even when the surface of the scrap saggar is polished to a relatively small degree and there are still relatively many cracks on the surface of the scrap saggar, the saggar repair slurry can permeate into the cracks of the scrap saggar relatively well and be attached and filled into the cracks of the scrap saggar relatively well so that even when the scrap saggar is polished to a relatively small degree, the repair effect of the scrap saggar is improved relatively well and the service life of the repaired scrap saggar is ensured relatively well. Furthermore, the pre-repaired saggar is subjected to overturned standing to remove the saggar repair slurry flowable on the surface of the pre-repaired saggar, relatively well ensuring the surface flatness of the scrap saggar during the heat treatment and the repair effect of the scrap saggar. In an embodiment, before the step of scraping the surface of the scrap saggar and after the step of acquiring the scrap saggar and the saggar repair slurry in any one of the preceding embodiments, the saggar repair method further includes the following step: the surface of the scrap saggar is cleaned to remove the positive electrode material on the surface of the scrap saggar. In an embodiment, the surface of the scrap saggar is cleaned, which specifically includes that the scrap saggar is cleaned with air and washed with water, separately. In an embodiment, the scrap saggar with the surface scraped is impregnated with the saggar repair slurry, which specifically includes the following steps: the scrap saggar with the surface scraped is subjected to stacking treatment by using an impregnation tank so that the scrap saggars are stacked in the impregnation tank; the saggar repair slurry is injected into the impregnation tank and the impregnation tank is sealed and vacuumized; and ultrasonic impregnation is performed on the scrap saggar after sealing and vacuumizing. In this manner, the sufficient impregnation of the scrap saggars is achieved relatively well, that is, it is ensured relatively well that the saggar repair slurry is sufficiently attached and filled into the cracks of the scrap saggar, and then the repair effect of the scrap saggar is ensured relatively well. In an embodiment, the scrap saggars are stacked in the impregnation tank by 8 to 12 layers, relatively well ensuring the impregnation effect of the scrap saggars. In an embodiment, the scrap saggars are stacked in the impregnation tank in a non-overturned manner. It is to be understood that if the scrap saggars are stacked in the impregnation tank in an overturned manner, the scrap saggars are quickly submerged when the saggar repair slurry is poured into the impregnation tank at a relatively high speed; thus, large air bubbles exist in the scrap saggars due to the presence of air inside the scrap saggars; and it is relatively difficult to ensure the effective removal of such air bubbles through sealing and vacuumizing, affecting the impregnation effect of the scrap saggars relatively greatly, that is, affecting the repair effect of the scrap saggar relatively greatly. Therefore, in the present application, the scrap saggars are stacked in the impregnation tank in the non-overturned manner so that the generation of such air bubbles is reduced relatively well and the repair effect of the scrap saggar is ensured relatively well. In an embodiment, after the saggar repair slurry is injected into the impregnation tank, the level of the saggar repair slurry is at least 15 cm higher than the top scrap saggar, relatively well ensuring the impregnation effect of the scrap saggars. In an embodiment, after the impregnation tank is sealed and vacuumized, the impregnation tank has a pressure of 0.3 atm to 0.7 atm, relatively well ensuring the impregnation effect of the scrap saggars. In an embodiment, the ultrasonic impregnation is performed on the scrap saggars after sealing and vacuumizing for an impregnation time of 20 min to 30 min, relatively well ensuring the impregnation effect of the scrap saggars. In an embodiment, the ultrasonic impregnation is performed on the scrap saggars after sealing and vacuumizing at an impregnation temperature of 45 °C to 60 °C, relatively well ensuring the impregnation effect of the scrap saggars. In an embodiment, the ultrasonic impregnation is performed on the scrap saggars after sealing and vacuumizing at an ultrasonic frequency of 20 kHz to 45 kHz, relatively well ensuring the impregnation effect of the scrap saggars. In an embodiment, the heat treatment is performed on the pre-repaired saggar after the overturned standing, which specifically includes the following steps: the pre-repaired saggar after the overturned standing is dried; and the pre-repaired saggar after drying is baked thermally, relatively well ensuring the repair effect of the scrap saggar. In an embodiment, the pre-repaired saggar after the overturned standing is dried at 25 °C to 60 °C, relatively well ensuring the repair effect of the scrap saggar. In an embodiment, the pre-repaired saggar after the overturned standing is dried for 6 h to 9 h, relatively well ensuring the repair effect of the scrap saggar. In an embodiment, the pre-repaired saggar after drying is baked thermally at 200 °C to 700 °C, relatively well ensuring the repair effect of the scrap saggar. In an embodiment, the pre-repaired saggar after drying is baked thermally for 15 min to 30 min, relatively well ensuring the repair effect of the scrap saggar. The present application also provides a saggar repaired by the saggar repair method in any one of the preceding embodiments. Compared with the related art, the present application has at least the advantages below. In the saggar repair slurry of the present application, the matrix, the clay, the adhesive, and water are combined to prepare the saggar repair slurry for immersing the scrap saggar, and the saggar repair slurry has a solid content of 15% to 25%, thereby ensuring the fluidity of the saggar repair slurry and relatively well ensuring the impregnation effect of the saggar repair slurry on the whole scrap saggar. Additionally, the saggar repair slurry has a particle size of less than 5 pm, ensuring the permeability of the saggar repair slurry into the cracks of the scrap saggar, and that is, ensuring that the saggar repair slurry can permeate into the cracks of the scrap saggar to fill and level the cracks of the scrap saggar. Additionally, the matrix is at least one of aluminum oxide, mullite, cordierite, spinel, and the crushed saggar material and combined with the clay, the adhesive, and water to prepare the slurry for repairing the scrap saggar so that the high bonding strength of the saggar repair slurry on the surface of the scrap saggar after the heat treatment on the scrap saggar is achieved relatively stably, and the structural strength of the scrap saggar after the heat treatment is enhanced, that is, the repair effect of the scrap saggar is ensured relatively well. As a result, not only is the scrap saggar repaired to reduce the number of scrap saggars generated, but also the service life of the repaired scrap saggar is extended, thereby effectively improving the reuse rate of scrap saggars, extending the service life of the saggar, and reducing the preparation cost of the positive electrode material. Some specific examples are set forth below. The “%” mentioned represents a percentage by weight. It is to be noted that all possible cases are not exhausted in the following examples and the materials used in the following examples are commercially available unless otherwise specified. Example 1 A repair slurry was prepared. A matrix (50 kg), clay (5 kg), and polyurethane (1 kg) were acquired. The matrix was powder formed by mixing mullite and saggar powder (where the mass ratio of the saggar powder to mullite was 1:1.5) generated when the surface layer of a reusable saggar was polished, the particle size of the matrix was D50 = 0.50 pm, and the particle size of the clay was less than 4.5 pm. The matrix, the clay, and polyurethane were mixed to form a mixture. Water was added to the mixture in four portions and the mixture was stirred for 2 h at a stirring rate of 1000 r / min, where the amount of water added was 10%, 20%, 60%, and the remaining water, and the stirring was stopped when the viscosity of the formed slurry was 315 cP, where the solid content of the slurry was 15%. A scrap saggar was repaired. The scrap saggar was prepared, part of an easily detached peeling layer on the surface of the saggar to be treated was scraped off with a scraper, and the saggar (height: 70 mm) was placed with its top side up and stacked in an impregnation tank, where 12 layers were stacked. The slurry was injected into the impregnation tank along its wall to reduce the generation of air bubbles, where a slurry injection height was 1 m. After the slurry injection height was reached, slurry injection was stopped, the cover plate of the impregnation tank was closed and locked so that the impregnation tank was in a sealed state, the impregnation tank was vacuumized to 0.7 standard atmospheric pressure through an air suction hole provided on the cover plate of the impregnation tank to improve slurry permeability, and ultrasonic impregnation was performed for 20 min at 60 °C. After the impregnation ended, the slurry was pumped out, the saggar was taken out and turned upside down to be placed in an overturned manner to remove the excess slurry on the surface; and the saggar was dried with hot air for 9 h at 25 °C and subjected to heat treatment for 30 min at 250 °C. The object treated in this example was a saggar used 22 times (the saggar being used for producing a ternary positive electrode material and the surface of the saggar being damaged to a degree similar to that of the scrap saggar shown in FIG. 3). The treated saggar (its surface being similar to that of the repaired scrap saggar shown in FIG. 4) was reused 13 times before being scrapped. Example 2 A repair slurry was prepared. A matrix (55 kg), clay (8 kg), and polyurethane (1.2 kg) were acquired. The matrix was powder formed by mixing mullite and saggar powder (where the mass ratio of the saggar powder to mullite was 1:2) generated when the surface layer of a reusable saggar was polished, the particle size of the matrix was D50 = 0.57 pm, and the particle size of the clay was less than 3 pm. The matrix, the clay, and polyurethane were mixed to form a mixture. Water was added to the mixture in four portions and the mixture was stirred for 1.5 h at a stirring rate of 1300 r / min, where the amount of water added was 12%, 22%, 45%, and the remaining water, and the stirring was stopped when the viscosity of the formed slurry was 250 cP, where the solid content of the slurry was 20%. A scrap saggar was repaired. The scrap saggar was prepared, part of an easily detached peeling layer on the surface of the saggar to be treated was scraped off with a scraper, and the saggar (height: 70 mm) was placed with its top side up and stacked in an impregnation tank, where 10 layers were stacked. The slurry was injected into the impregnation tank along its wall to reduce the generation of air bubbles, where the slurry injection height was 0.9 m. After the slurry injection height was reached, slurry injection was stopped, the cover plate of the impregnation tank was closed and locked so that the impregnation tank was in a sealed state, the impregnation tank was vacuumized to 0.5 standard atmospheric pressure through an air suction hole provided on the cover plate of the impregnation tank to improve slurry permeability, and ultrasonic impregnation was performed for 25 min at 50 °C. After the impregnation ended, the slurry was pumped out, the saggar was taken out and turned upside down to be placed in an overturned manner to remove the excess slurry on the surface; and the saggar was dried with hot air for 7 h at 50 °C and subjected to heat treatment for 20 min at 320 °C. The object treated in this example was a saggar used 22 times (the saggar being used for producing a ternary positive electrode material and the surface of the saggar being damaged to a degree similar to that of the scrap saggar shown in FIG. 3). The treated saggar (its surface being similar to that of the repaired scrap saggar shown in FIG. 4) was reused 15 times before being scrapped. Example 3 A repair slurry was prepared. A matrix (60 kg), clay (10 kg), and polyurethane (1.5 kg) were acquired. The matrix was powder formed by mixing mullite and saggar powder (where the mass ratio of the saggar powder to mullite was 1:3) generated when the surface layer of a reusable saggar was polished, the particle size of the matrix was D50 = 0.75 pm, and the particle size of the clay was less than 1.2 pm. The matrix, the clay, and polyurethane were mixed to form a mixture. Water was added to the mixture in four portions and the mixture was stirred for 1 h at a stirring rate of 1500 r / min, where the amount of water added was 15%, 25%, 40%, and the remaining water, and the stirring was stopped when the viscosity of the formed slurry was 150 cP, where the solid content of the slurry was 25%. A scrap saggar was repaired. The scrap saggar was prepared, part of an easily detached peeling layer on the surface of the saggar to be treated was scraped off with a scraper, and the saggar (height: 70 mm) was placed with its top side up and stacked in an impregnation tank, where 8 layers were stacked. The slurry was injected into the impregnation tank along its wall to reduce the generation of air bubbles, where the slurry injection height was 0.75 m. After the slurry injection height was reached, slurry injection was stopped, the cover plate of the impregnation tank was closed and locked so that the impregnation tank was in a sealed state, the impregnation tank was vacuumized to 0.3 standard atmospheric pressure through an air suction hole provided on the cover plate of the impregnation tank to improve slurry permeability, and ultrasonic impregnation was performed for 30 min at 45 °C. After the impregnation ended, the slurry was pumped out, the saggar was taken out and turned upside down to be placed in an overturned manner to remove the excess slurry on the surface; and the saggar was dried with hot air for 6 h at 60 °C and subjected to heat treatment for 15 min at 650 °C. The object treated in this example was a saggar used 22 times (the saggar being used for producing a ternary positive electrode material and the surface of the saggar being damaged to a degree similar to that of the scrap saggar shown in FIG. 3). The treated saggar (its surface being similar to that of the repaired scrap saggar shown in FIG. 4) was reused 12 times before being scrapped. Example 4 A repair slurry was prepared. A matrix (55 kg), clay (8 kg), and polyurethane (1.2 kg) were acquired. The matrix was mullite, the particle size of the matrix was D50 = 0.57 pm, and the particle size of the clay was less than 3 pm. The matrix, the clay, and polyurethane were mixed to form a mixture. Water was added to the mixture in four portions and the mixture was stirred for 1.5 h at a stirring rate of 1300 r / min, where the amount of water added was 12%, 22%, 45%, and the remaining water, and the stirring was stopped when the viscosity of the formed slurry was 250 cP, where the solid content of the slurry was 20%. A scrap saggar was repaired. The scrap saggar was prepared, part of an easily detached peeling layer on the surface of the saggar to be treated was scraped off with a scraper, and the saggar (height: 70 mm) was placed with its top side up and stacked in an impregnation tank, where 10 layers were stacked. The slurry was injected into the impregnation tank along its wall to reduce the generation of air bubbles, where the slurry injection height was 0.9 m. After the slurry injection height was reached, slurry injection was stopped, the cover plate of the impregnation tank was closed and locked so that the impregnation tank was in a sealed state, the impregnation tank was vacuumized to 0.5 standard atmospheric pressure through an air suction hole provided on the cover plate of the impregnation tank to improve slurry permeability, and ultrasonic impregnation was performed for 25 min at 50 °C. After the impregnation ended, the slurry was pumped out, the saggar was taken out and turned upside down to be placed in an overturned manner to remove the excess slurry on the surface; and the saggar was dried with hot air for 7 h at 50 °C and subjected to heat treatment for 20 min at 320 °C. The object treated in this example was a saggar used 22 times (the saggar being used for producing a ternary positive electrode material and the surface of the saggar being damaged to a degree similar to that of the scrap saggar shown in FIG. 3). The treated saggar (its surface being similar to that of the repaired scrap saggar shown in FIG. 4) was reused 10 times before being scrapped. Example 5 A repair slurry was prepared. A matrix (50 kg), clay (5 kg), and polyurethane (1 kg) were acquired. The matrix was aluminum oxide, the particle size of the matrix was D50 = 0.57 pm, and the particle size of the clay was less than 5 pm. The matrix, the clay, and polyurethane were mixed to form a mixture. Water was added to the mixture in four portions and the mixture was stirred at a stirring rate of 1500 r / min, where the amount of water added was 12%, 22%, 40%, and the remaining water, and the stirring was stopped when the viscosity of the formed slurry was less than 350 cP (tested by a Brookfield rotary viscometer, 315 cP), where the solid content of the slurry was 15%. A scrap saggar was repaired. The scrap saggar was prepared, part of an easily detached peeling layer on the surface of the saggar to be treated was scraped off with a scraper, and the saggar (height: 70 mm) was placed with its top side up and stacked in an impregnation tank, where 12 layers were stacked. The slurry was injected into the impregnation tank along its wall to reduce the generation of air bubbles, where the slurry injection height was 1.2 m. After the slurry injection height was reached, slurry injection was stopped, the cover plate of the impregnation tank was closed and locked so that the impregnation tank was in a sealed state, the impregnation tank was vacuumized to 0.3 standard atmospheric pressure through an air suction hole provided on the cover plate of the impregnation tank to improve slurry permeability, and impregnation was performed for 20 min. After the impregnation ended, the slurry was pumped out, the saggar was taken out and turned upside down to be placed in an overturned manner to remove the excess slurry on the surface; and the saggar was dried with hot air for 7 h at 45 °C and subjected to heat treatment for 15 min at 300 320 °C. The object treated in this example was a saggar used 22 times (the saggar being used for producing a ternary positive electrode material and the surface of the saggar being damaged to a degree similar to that of the scrap saggar shown in FIG. 3). The treated saggar (its surface being similar to that of the repaired scrap saggar shown in FIG. 4) was reused 9 times before being scrapped. Example 6 A repair slurry was prepared. A matrix (50 kg), clay (5 kg), and polyurethane (1 kg) were acquired. The matrix was cordierite, the particle size of the matrix was D50 = 0.57 pm, and the particle size of the clay was less than 5 pm. The matrix, the clay, and polyurethane were mixed to form a mixture. Water was added to the mixture in four portions and the mixture was stirred at a stirring rate of 1500 r / min, where the amount of water added was 12%, 22%, 40%, and the remaining water, and the stirring was stopped when the viscosity of the formed slurry was less than 350 cP (tested by a Brookfield rotary viscometer, 315 cP), where the solid content of the slurry was 15%. A scrap saggar was repaired. The scrap saggar was prepared, part of an easily detached peeling layer on the surface of the saggar to be treated was scraped off with a scraper, and the saggar (height: 70 mm) was placed with its top side up and stacked in an impregnation tank, where 12 layers were stacked. The slurry was injected into the impregnation tank along its wall to reduce the generation of air bubbles, where the slurry injection height was 1.2 m. After the slurry injection height was reached, slurry injection was stopped, the cover plate of the impregnation tank was closed and locked so that the impregnation tank was in a sealed state, the impregnation tank was vacuumized to 0.3 standard atmospheric pressure through an air suction hole provided on the cover plate of the impregnation tank to improve slurry permeability, and impregnation was performed for 20 min. After the impregnation ended, the slurry was pumped out, the saggar was taken out and turned upside down to be placed in an overturned manner to remove the excess slurry on the surface; and the saggar was dried with hot air for 7 h at 45 °C and subjected to heat treatment for 15 min at 300-320 °C. The object treated in this example was a saggar used 22 times (the saggar being used for producing a ternary positive electrode material and the surface of the saggar being damaged to a degree similar to that of the scrap saggar shown in FIG. 3). The treated saggar (its surface being similar to that of the repaired scrap saggar shown in FIG. 4) was reused 9 times before being scrapped. Example 7 A repair slurry was prepared. A matrix (50 kg), clay (5 kg), and polyurethane (1 kg) were acquired. The matrix was a mixture of mullite and spinel (where the mass ratio of spinel to mullite was 1:2), the particle size of the matrix was D50 = 0.57 pm, and the particle size of the clay was less than 5 pm. The matrix, the clay, and polyurethane were mixed to form a mixture. Water was added to the mixture in four portions and the mixture was stirred at a stirring rate of 1500 r / min, where the amount of water added was 12%, 22%, 40%, and the remaining water, and the stirring was stopped when the viscosity of the formed slurry was less than 350 cP (tested by a Brookfield rotary viscometer, 315 cP), where the solid content of the slurry was 15%. A scrap saggar was repaired. The scrap saggar was prepared, part of an easily detached peeling layer on the surface of the saggar to be treated was scraped off with a scraper, and the saggar (height: 70 mm) was placed with its top side up and stacked in an impregnation tank, where 12 layers were stacked. The slurry was injected into the impregnation tank along its wall to reduce the generation of air bubbles, where the slurry injection height was 1.2 m. After the slurry injection height was reached, slurry injection was stopped, the cover plate of the impregnation tank was closed and locked so that the impregnation tank was in a sealed state, the impregnation tank was vacuumized to 0.3 standard atmospheric pressure through an air suction hole provided on the cover plate of the impregnation tank to improve slurry permeability, and impregnation was performed for 20 min. After the impregnation ended, the slurry was pumped out, the saggar was taken out and turned upside down to be placed in an overturned manner to remove the excess slurry on the surface; and the saggar was dried with hot air for 7 h at 45 °C and subjected to heat treatment for 15 min at 300 320 °C. The object treated in this example was a saggar used 22 times (the saggar being used for producing a ternary positive electrode material and the surface of the saggar being damaged to a degree similar to that of the scrap saggar shown in FIG. 3). The treated saggar (its surface being similar to that of the repaired scrap saggar shown in FIG. 4) was reused 10 times before being scrapped. Comparative Example 1 A repair slurry was prepared. A matrix (55 kg), clay (8 kg), and polyurethane (1.2 kg) were acquired. The matrix was powder formed by mixing mullite and saggar powder (where the mass ratio of the saggar powder to mullite was 1:2) generated when the surface layer of a reusable saggar was polished, the particle size of the matrix was D50 = 0.57 pm, and the particle size of the clay was less than 3 pm. The matrix, the clay, and polyurethane were mixed to form a mixture. Water was added to the mixture in four portions and the mixture was stirred for 1.5 h at a stirring rate of 1300 r / min, where the amount of water added was 12%, 22%, 45%, and the remaining water, and the stirring was stopped when the viscosity of the formed slurry was 250 cP, where the solid content of the slurry was 20%. A scrap saggar was repaired. The scrap saggar was prepared, part of an easily detached peeling layer on the surface of the saggar to be treated was scraped off with a scraper, and the saggar (height: 70 mm) was placed with its top side up and stacked in an impregnation tank, where 12 layers were stacked. The slurry was injected into the impregnation tank along its wall to reduce the generation of air bubbles, where the slurry injection height was 1.2 m. After the slurry injection height was reached, slurry injection was stopped, the cover plate of the impregnation tank was closed and locked so that the impregnation tank was in a sealed state, the impregnation tank was vacuumized to 0.3 standard atmospheric pressure through an air suction hole provided on the cover plate of the impregnation tank to improve slurry permeability, and impregnation was performed for 20 min. After the impregnation ended, the slurry was pumped out, the saggar was taken out and turned upside down to be placed in an overturned manner to remove the excess slurry on the surface; and the saggar was dried with hot air for 7 h at 45 °C and subjected to heat treatment for 15 min at a temperature of 300-320 °C. The object treated in this example was a saggar used 22 times (the saggar being used for producing a ternary positive electrode material and the surface of the saggar being damaged to a degree similar to that of the scrap saggar shown in FIG. 3). During the heat treatment, cracks appeared on the surface of the saggar and the treated saggar was only reused once and then cracked and was scrapped. Comparative Example 2 A repair slurry was prepared. A matrix (55 kg), clay (8 kg), and polyurethane (1.2 kg) were acquired. The matrix was powder formed by mixing mullite and saggar powder (where the mass ratio of the saggar powder to mullite was 1:2) generated when the surface layer of a reusable saggar was polished, the particle size of the matrix was D50 = 0.57 pm, and the particle size of the clay was less than 3 pm. The matrix, the clay, and polyurethane were mixed to form a mixture. Water was added to the mixture in four portions and the mixture was stirred for 1.5 h at a stirring rate of 1300 r / min, where the amount of water added was 12%, 22%, 45%, and the remaining water, and the stirring was stopped when the viscosity of the formed slurry was 250 cP, where the solid content of the slurry was 20%. A scrap saggar was repaired. The scrap saggar was prepared, part of an easily detached peeling layer on the surface of the saggar to be treated was scraped off with a scraper, the slurry was automatically coated on the surface of the saggar by using an automatic coating apparatus, the coating was stopped after the saggar was coated 7 times, and the saggar was dried with hot air for 7 h at 45 °C and subjected to heat treatment for 15 min at 300-320 °C. The object treated in this example was a saggar used 22 times (the saggar being used for producing a ternary positive electrode material and the surface of the saggar being damaged to a degree similar to that of the scrap saggar shown in FIG. 3). During the heat treatment, small cracks appeared and the treated saggar cracked and was reused only 5 times and then cracked and was scrapped. Additionally, the automatic coating apparatus was not equipped in the production workshop of the positive electrode material and needed to be purchased and 5 debugged additionally, increasing the cost. The preceding embodiments are merely several embodiments of the present application, and the specific and detailed description thereof cannot be construed as limiting the scope of the present application. It is to be noted that those of ordinary skill in the art can make a number of variations and improvements without departing from the concept of the present application, and 10 such variations and improvements are within the scope of the present application. Therefore, the scope of the present application is defined by the appended claims.

Claims

1. A saggar repair slurry, comprising a solid component and a liquid component, wherein the solid component comprises a matrix and clay and the liquid component comprises an adhesive and water;wherein the matrix is at least one of aluminum oxide, mullite, cordierite, spinel, and a crushed saggar material;the saggar repair slurry has a solid content of 15% to 25% and a particle size of less than 5 pm and is used for immersing a scrap saggar.

2. The saggar repair slurry according to claim 1, wherein the saggar repair slurry comprises the following components in parts by mass:50 parts to 60 parts of matrix;5 parts to 10 parts of clay;1 part to 1.5 parts of adhesive; andremaining parts of water.

3. The saggar repair slurry according to claim 1, wherein the matrix has a particle size of 0.1 pm to 5 pm; and / orthe clay has a particle size of less than 5 pm.

4. The saggar repair slurry according to claim 1, wherein the matrix comprises mullite and the crushed saggar material.

5. The saggar repair slurry according to claim 1, wherein the adhesive is at least one of polyurethane and polyacrylamide.

6. A method for preparing the saggar repair slurry according to any one of claims 1 to 5, comprising the steps of:acquiring a matrix, clay, and an adhesive;mixing the matrix, the clay, and the adhesive to obtain a mixture; andstirring and diluting the mixture with water to obtain the saggar repair slurry.

7. The method according to claim 6, wherein the mixture is stirred and diluted with water at a stirring rate of 1000 r / min to 1500 r / min; and / orthe saggar repair slurry has a viscosity of less than 350 cP.

8. A saggar repair method, comprising the steps of:acquiring a scrap saggar and the saggar repair slurry according to any one of claims 1 to 5;scraping a surface of the scrap saggar to remove an easily detached peeling layer on the surface of the scrap saggar;impregnating the scrap saggar with the surface scraped with the saggar repair slurry to obtain a pre-repaired saggar;subjecting the pre-repaired saggar to overturned standing to remove the saggar repair slurry which is flowable on a surface of the pre-repaired saggar; andperforming heat treatment on the pre-repaired saggar after the overturned standing.

9. The saggar repair method according to claim 8, wherein impregnating the scrap saggar with the surface scraped with the saggar repair slurry comprises:subjecting the scrap saggar with the surface scraped to stacking treatment by using an impregnation tank so that the scrap saggars are stacked in the impregnation tank;injecting the saggar repair slurry into the impregnation tank and sealing and vacuumizing the impregnation tank; andperforming ultrasonic impregnation on the scrap saggar after the sealing and vacuumizing.

10. A saggar repaired by the saggar repair method according to claim 8 or 9.INTERNATIONAL SEARCH REPORT International application No. PCT / CN2023 / 077580A. CLASSIFICATION OF SUBJECT MATTER C04B35 / 622(2006.01)i; C04B35 / 106(2006.01)i; C04B41 / 87(2006.01)i; H01M4 / 04(2006.01)i; C04B35 / 185(2006.01)i According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) IPC: C04B35 / -; C04B41 / -; H01M4 / - Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) CNABS, CNTXT, ENTXT, ENTXTC, VEN: AhhE, SM A, SB SS, AhW, E, EW, {¢#, Wil, Wttn, Si, SffA, ISA, al2o3, BRUNP, sagger, repair, mend, soak+, immers+, dipping, clay, cordierite, mullite, spinel, alumina, aluminum oxide C. DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. Y CN 112979294 A (CENTRAL SOUTH UNIVERSITY) 18 June 2021 (2021-06-18) description, paragraphs 6-26 1-10 Y A A CN 105777090 A (WUHAN UNIVERSITY OF TECHNOLOGY) 20 July 2016 (2016-07-20) description, paragraphs 3-26 CN 104926322 A (LI JINSHENG) 23 September 2015 (2015-09-23) entire document CN 108302942 A (ZHU XINGYU et al.) 20 July 2018 (2018-07-20) entire document 1-10 1-10 1-10 A JP Hl 1199333 A (NIPPON KOKAN KK; SHINAGAWA REFRACTORIES CO., LTD.) 27 July 1999 (1999-07-27) entire document 1-10 | | Further documents are listed in the continuation of Box C. | f | See patent family annex. * Special categories of cited documents: “T” later document published after the international filing date or priority “A” document defining the general state of the art which is not considered date and not in conflict with the application but cited to understand the to be of particular- relevance principle or theory underlying the invention “D” document cited by the applicant in the international application -‘X” document of particular relevance; the claimed invention cannot be “E" earlier application or patent but published on or after the international considered novel or cannot be considered to involve an inventive step filing date when the document is taken alone “L" document which may throw doubts on priority claim(s) or which is “Y” document of particular relevance; the claimed invention cannot be cited to establish the publication date of another citation or other considered to involve an inventive step when the document is special reason (as specified) combined with one or more other such documents, such combination “O” document referring to an oral disclosure, use, exhibition or other being obvious to a person skilled in the ait means document member of the same patent family “P” document published prior to the international filing date but later than the priority date claimed Date of the actual completion of the international search 18 May 2023 Date of mailing of the international search report 31 May 2023 Name and mailing address of the ISA / CN China National Intellectual Property Administration (ISA / CN) China No. 6, Xitucheng Road, Jimenqiao, Haidian District, Beijing 100088 Authorized officer Telephone No.INTERNATIONAL SEARCH REPORT Information on patent family membersInternational application No.PCT / CN2023 / 077580Patent document cited in search report Publication date (day / month / year) Patent family member) s) Publication date (day / month / year) CN 112979294 A 18 June 2021 CN 112979294 B 06 May 2022 CN 105777090 A 20 July 2016 None CN 104926322 A 23 September 2015 CN 104926322 B 25 July 2017 CN 108302942 A 20 July 2018 JP 2019121601 A 22 July 2019 JP 7229456 B2 28 February 2023 JP Hl 1199333 A 27 July 1999 None

Images