A renewable skateboard brick, its preparation method and application

Abstract

The application provides a renewable slide plate brick and a preparation method and application thereof, and belongs to the technical field of refractory materials. The application uses waste slide plate bricks as initial raw materials, and after simple impurity removal, crushing and hydration treatment, the waste slide plate bricks can be used as renewable slide plate bricks to replace part of the tabular corundum and be used in combination with other components to prepare renewable slide plate bricks with high strength, low porosity and excellent resistance to molten steel scouring. Meanwhile, the renewable slide plate bricks can also be treated in a series of processes to realize renewable reuse. Through testing, the renewable slide plate bricks prepared by the application have no hydration and cracking phenomenon after forming and heat treatment processes, the finished product indexes meet the actual use requirements, and the average service life is more than 2 times.

Description

Technical Field

[0001] This invention belongs to the field of refractory materials technology, specifically relating to a renewable sliding plate brick, its preparation method, and its application. Background Technology

[0002] As a key flow control refractory material used in sliding gate mechanisms, slide gate bricks endure extremely harsh service environments during steelmaking, including severe scouring by high-temperature molten steel, chemical corrosion, and thermal shock. Therefore, slide gate bricks require extremely high performance and are typically prepared using high-quality raw materials, primarily high-grade tabular corundum. Research has shown that the residue of used slide gate bricks still retains a large amount of valuable main crystalline phase components, making it a rare secondary resource.

[0003] However, during high-temperature service, the metallic aluminum in the skateboard brick components undergoes complex high-temperature phase reactions with carbon. For example... Figure 1 As shown in the curve corresponding to untreated recycled waste skateboard bricks, the post-reaction phase composition is complex. Besides the original Al₂O₃ and residual Al and C, non-oxide phases such as aluminum nitride (AlN) and aluminum carbide (Al₄C₃) are also generated. Among these, AlN and aluminum carbide (Al₄C₃) exhibit significant chemical instability and readily undergo hydration reactions under normal temperature and humidity: Al₄C₃ + 12H₂O = 4Al(OH)₃ + 3CH₄, AlN + 3H₂O = Al(OH)₃ + NH₃. These reactions not only generate gaseous products, but the formation of the solid product Al(OH)₃ is accompanied by a volume expansion effect of up to 2 to 4 times. If untreated recycled skateboard bricks are directly introduced into the production process, this severe volume effect will lead to extremely high structural stress within the material, ultimately causing cracking or even pulverization of the product, severely damaging the material's volume stability and mechanical properties. Due to this hydration problem, efficient direct recycling of used skateboard bricks is currently largely unattainable in the industry.

[0004] To address the aforementioned technical bottlenecks, existing treatment methods often employ a "tiered utilization" strategy, where recycled materials are used in refractory products with lower performance requirements. However, this is clearly a waste of high-value resources and fails to fully exploit the potential value of used sliding plate bricks. Therefore, there is an urgent need to develop an efficient, convenient, and cost-effective treatment method to completely remove or stabilize easily hydrated harmful phases in recycled sliding plate brick particles, thereby improving the resource utilization rate of refractory materials. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a renewable sliding plate brick, its preparation method, and its application. This invention recycles used sliding plate bricks and uses them as raw materials to prepare sliding plate bricks, resulting in a renewable sliding plate brick with high strength, low porosity, and excellent resistance to molten steel erosion. Furthermore, this sliding plate brick can be recycled and reused.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a renewable skateboard brick, comprising, by weight:

[0008] 30-55 parts recycled skateboard pellets, 20-45 parts tabular corundum, 8-15 parts high-alumina fine powder, 0.5-4 parts carbon black, 1-6 parts metallic aluminum powder, 1-4 parts antioxidant, and 3-5.5 parts resin;

[0009] The recycled skateboard granules are obtained by removing impurities, crushing and hydrating waste skateboard bricks; the recycled skateboard granules include recycled skateboard particles and recycled skateboard fine powder; the recycled skateboard granules include recycled skateboard particles with a particle size of 3~1 mm, recycled skateboard particles with a particle size of 1~0 mm and recycled skateboard fine powder with a particle size of 0.088 mm.

[0010] The tabular corundum includes tabular corundum particles and tabular corundum fine powder.

[0011] Preferably, after the crushing process, crushed particles of 3~0 mm are obtained.

[0012] Preferably, the hydration treatment is performed by sprinkling and / or soaking the crushed particles in water; the hydration treatment is carried out under stirring conditions, and the hydration treatment time is 15 to 20 days.

[0013] Preferably, the hydration treatment further includes a drying treatment.

[0014] Preferably, the moisture content of the recycled skateboard pellets obtained after the drying process is ≤0.5 wt%.

[0015] Preferably, the recycled skateboard pellets, by weight, include 15-30 parts of recycled skateboard pellets with a particle size of 3-1 mm, 10-20 parts of recycled skateboard pellets with a particle size of 1-0 mm, and 5-10 parts of recycled skateboard fine powder with a particle size of 0.088 mm.

[0016] Preferably, the tabular corundum comprises tabular corundum particles with a particle size of 2-1 mm, tabular corundum particles with a particle size of 1-0.5 mm, tabular corundum particles with a particle size of 0.5-0 mm, and tabular corundum fine powder with a particle size of 0.044 mm.

[0017] Preferably, the tabular alumina comprises, by weight, 4-20 parts of tabular alumina particles with a particle size of 2-1 mm, 3-8 parts of tabular alumina particles with a particle size of 1-0.5 mm, 3-7 parts of tabular alumina particles with a particle size of 0.5-0 mm, and 10-15 parts of fine tabular alumina powder with a particle size of 0.044 mm.

[0018] Preferably, the particle size of the high-alumina fine powder is 0.044~0.088 mm.

[0019] Preferably, the particle size of the aluminum powder is 0.044~0.088 mm.

[0020] Preferably, the carbon black includes, but is not limited to, carbon black N220.

[0021] Preferably, the resin includes, but is not limited to, phenolic resin and / or silicone resin.

[0022] Preferably, the antioxidant includes boron carbide powder and silicon carbide powder.

[0023] Preferably, the antioxidant comprises, by weight, 0.2 to 1 part boron carbide powder and 1 to 2 parts silicon carbide powder.

[0024] Secondly, the present invention provides a method for preparing the above-mentioned renewable sliding plate brick, comprising the following steps:

[0025] After the recycled skateboard particles and tabular corundum particles are mixed evenly, resin is added and mixing continues. Then, recycled skateboard fine powder, tabular corundum fine powder, high alumina fine powder, carbon black, metallic aluminum powder and antioxidant are added to make mud. After post-processing, renewable skateboard bricks are obtained.

[0026] Thirdly, the present invention provides an application of the above-mentioned renewable sliding plate brick in a sliding gate mechanism.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] This invention uses waste sliding plate bricks as initial raw materials. After simple impurity removal, crushing, and hydration treatment, they can be used as recycled sliding plate particles to replace part of the tabular corundum. When combined with other components, they can be used to prepare recyclable sliding plate bricks with high strength, low porosity, and excellent resistance to molten steel erosion. Furthermore, these recyclable sliding plate bricks can also undergo a series of treatments to achieve recycling.

[0029] The recycled skateboard material prepared by the method of this invention can be mass-produced, and effectively removes the easily hydrated components Al4C3 and AlN from the recycled skateboard material.

[0030] Tests have shown that the renewable sliding plate bricks prepared by this invention, after undergoing molding, heat treatment, and other processes, exhibit no dehydration or cracking. The finished product meets the requirements for actual use, with an average service life of more than two uses. Attached Figure Description

[0031] Figure 1 XRD patterns of waste skateboard brick recycled materials after calcination, 20-day water immersion, and no treatment;

[0032] Among them, 20-day immersion treatment corresponds to Examples 1 to 5; no treatment corresponds to Example 1; calcination treatment corresponds to Example 4. Detailed Implementation

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] The present invention will now describe the corresponding technical solutions in three parts.

[0035] Part One

[0036] This invention provides a renewable skateboard brick, comprising, by weight:

[0037] 30-55 parts recycled skateboard granules, 20-45 parts tabular corundum, 8-15 parts high-alumina fine powder, 0.5-4 parts carbon black, 1-6 parts metallic aluminum powder, 1-4 parts antioxidant, and 3-5.5 parts resin.

[0038] In this invention, the recyclable sliding plate brick comprises, by weight, 30-55 parts of recycled sliding plate aggregate, such as 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, or 55 parts, etc. The addition of the recycled sliding plate aggregate can replace a portion of the tabular corundum as the main material of the recyclable sliding plate brick, primarily used as aggregate to form the main framework and resist molten steel erosion and slag corrosion.

[0039] In this invention, the recycled skateboard pellets are obtained by removing impurities, crushing, and hydrating waste skateboard bricks.

[0040] Specifically, in some embodiments of the present invention, the recycled skateboard pellets are prepared according to the following method:

[0041] A) Impurity Removal Treatment: The waste skateboard bricks are treated to remove impurities, such as iron shells, iron hoops, veneers, and iron shell assembly mortar. Small steel pieces, steel slag, and other debris are cleaned from the skateboard surface. Cast holes that have been used in steel casting are removed, and the uncorroded and deteriorated areas of the skateboard are preserved.

[0042] B) Crushing process: The pre-treated waste skateboard bricks are crushed into recycled skateboard pre-treated material of 3~0 mm.

[0043] C) Hydration treatment: The crushed material is placed in a mixing hydration tank for treatment, or water is sprayed on it. The hydration cycle is greater than 15 days, preferably 15 to 30 days (e.g., 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30 days). During the hydration period, it is required to stir thoroughly at least once every half day to discharge the gas generated during hydration, avoid gas accumulation in the particles, and separate the water to slow down the hydration rate of the regenerated particles.

[0044] D) The hydrated material is dried at a temperature of 140~220℃, such as 140℃, 150℃, 160℃, 170℃, 180℃, 190℃, 200℃, 210℃, 220℃, etc., preferably 170℃; the drying time is 4~10h, such as 4h, 5h, 6h, 7h, 8h, 9h or 10h, etc., preferably 6h; the moisture content of the dried recycled skateboard pellets should be ≤0.5 wt%.

[0045] E) The dried recycled skateboard pellets are screened to obtain recycled skateboard pellets of 3~1 mm, recycled skateboard pellets of 1~0 mm and recycled skateboard fine powder of 0.088 mm.

[0046] In this invention, the specific surface area of ​​the material obtained after the above-mentioned crushing treatment increases, which facilitates and accelerates the subsequent hydration process. In this invention, the hydration treatment is used to remove aluminum carbide and aluminum nitride from waste skateboard bricks. Aluminum carbide and aluminum nitride easily react with moisture in the air to generate aluminum hydroxide, which expands in volume. If the treatment is not thorough, it will cause the product to crack and pulverize, affecting its use.

[0047] In some embodiments of the present invention, the recycled skateboard pellets include recycled skateboard granules and recycled skateboard fine powder.

[0048] Specifically, by weight, the recycled skateboard pellets include 15-30 parts of recycled skateboard pellets with a particle size of 3-1 mm (e.g., 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 parts, etc.), 10-20 parts of recycled skateboard pellets with a particle size of 1-0 mm (e.g., 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 parts, etc.), and 5-10 parts of recycled skateboard fine powder with a particle size of 0.088 mm (e.g., 5, 6, 7, 8, 9, or 10 parts, etc.).

[0049] The aforementioned 1~0 mm recycled skateboard pellets refer to pellets with a diameter greater than 0.088 mm and less than 1 mm, which are used as aggregates along with other large particles.

[0050] It should be noted that the recycled skateboard pellets of the above three particle sizes are specifically selected in this invention because the dense skeleton formed by the above-mentioned reasonable gradation can effectively resist load deformation at high temperatures. If any particle size is missing, or if the above range is not met, it will lead to segregation or uneven structure, and pitting or delamination will easily occur during the molding process.

[0051] In this invention, the recyclable sliding plate brick comprises, by weight, 20-45 parts of tabular corundum, such as 20, 22, 25, 28, 30, 32, 35, 38, 40, 42, or 45 parts, etc. The tabular corundum, as another main material of the recyclable sliding plate brick, is primarily used to adjust the alumina content. Furthermore, as a main material, tabular corundum exhibits superior overall performance compared to recycled sliding plate granules, improving the overall physicochemical properties of the recycled sliding plate brick (e.g., increasing bulk density and compressive strength).

[0052] In some embodiments of the present invention, the tabular corundum includes tabular corundum particles with a particle size of 2 to 1 mm, tabular corundum particles with a particle size of 1 to 0.5 mm, tabular corundum particles with a particle size of 0.5 to 0 mm, and tabular corundum fine powder with a particle size of 0.044 mm.

[0053] In some preferred embodiments of the present invention, the tabular alumina comprises, by weight, 4-20 parts of tabular alumina particles with a particle size of 2-1 mm, 3-8 parts of tabular alumina particles with a particle size of 1-0.5 mm, 3-7 parts of tabular alumina particles with a particle size of 0.5-0 mm, and 10-15 parts of fine tabular alumina powder with a particle size of 0.044 mm.

[0054] The above 4 to 20 portions can be 4, 6, 8, 10, 12, 14, 16, 18, or 20 portions, etc.; the above 3 to 8 portions can be 3, 4, 5, 6, 7, or 8 portions; the above 3 to 7 portions can be 3, 4, 5, 6, or 7 portions; the above 10 to 15 portions can be 10, 11, 12, 13, 14, or 15 portions, etc.

[0055] The aforementioned 0.5~0 mm plate-shaped corundum particles refer to particles with a diameter greater than 0.088 mm and less than 0.5 mm, which are used as aggregates along with other large particles.

[0056] In this invention, the renewable sliding plate brick comprises 8-15 parts of high-alumina fine powder, such as 8, 9, 10, 11, 12, 13, 14, or 15 parts, preferably 8-12 parts. The high-alumina fine powder has a particle size of less than 0.088 mm and an Al2O3 content of more than 88%. Its function is to fill the voids, achieve densification, improve resistance to erosion and permeability, promote sintering, and form a ceramic bond.

[0057] In some embodiments of the present invention, the particle size of the high-alumina fine powder is 0.044~0.088 mm, preferably 0.088 mm.

[0058] In this invention, the renewable skateboard brick comprises 1 to 6 parts of aluminum powder, such as 1, 2, 3, 4, 5, or 6 parts, preferably 5 to 6 parts. The aluminum powder mainly acts as a binder in the skateboard brick. The melting point of the aluminum powder is 660°C, and sintering at a medium temperature (approximately 680°C) can effectively improve the strength of the skateboard brick.

[0059] In some embodiments of the present invention, the particle size of the aluminum powder is 0.044~0.088 mm, preferably 0.088 mm.

[0060] In this invention, the renewable skateboard brick comprises 0.5 to 4 parts of carbon black, such as 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, or 4 parts, preferably 1 to 2 parts. The purpose of adding the carbon black is to form a high-strength carbon bond network with the phenolic resin, thereby improving the medium-temperature strength.

[0061] In some embodiments of the present invention, the carbon black includes, but is not limited to, carbon black N220.

[0062] In this invention, the renewable skateboard brick includes 1 to 4 parts of antioxidant, such as 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, or 4 parts, etc.

[0063] In some embodiments of the present invention, the antioxidant comprises boron carbide powder and silicon carbide powder. Preferably, the antioxidant comprises 0.2 to 1 part by weight of boron carbide powder and 1 to 2 parts by weight of silicon carbide powder.

[0064] The aforementioned 0.2 to 1 part can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1 part, etc. The aforementioned 1 to 2 parts can be 1 part, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2 parts, etc.

[0065] In this invention, the renewable skateboard brick comprises 3 to 5.5 parts of resin, such as 3 parts, 3.2 parts, 3.5 parts, 3.8 parts, 4 parts, 4.2 parts, 4.5 parts, 4.8 parts, 5 parts, 5.2 parts, or 5.5 parts, etc.

[0066] In some embodiments of the present invention, the resin includes, but is not limited to, phenolic resin and / or silicone resin, preferably phenolic resin.

[0067] This invention uses waste skateboard bricks as initial raw materials. After simple impurity removal, crushing and hydration treatment, they can be used as recycled skateboard particles to replace part of the tabular corundum. When used in combination with other components, recycled skateboard bricks with high strength (above 135MPa), low porosity (not exceeding 4%) and excellent resistance to molten steel erosion can be prepared.

[0068] Part Two

[0069] This invention provides a method for preparing the above-mentioned renewable sliding plate brick, comprising the following steps:

[0070] After the recycled skateboard particles and tabular corundum particles are mixed evenly, resin is added and mixing continues. Then, recycled skateboard fine powder, tabular corundum fine powder, high alumina fine powder, carbon black, metallic aluminum powder and antioxidant are added to make mud. After post-processing, renewable skateboard bricks are obtained.

[0071] In some embodiments of the present invention, it is preferable to mix and grind the treated recycled skateboard particles with tabular corundum particles for 2-5 minutes, add resin and continue mixing and grinding for 3-8 minutes, then add recycled skateboard particle fine powder, tabular corundum fine powder, high alumina fine powder, carbon black, metallic aluminum powder and antioxidant and continue mixing and grinding for 15-20 minutes to form mud. After the mud is left to stand for 20-24 hours, it is then molded, heat-treated, oil-immersed, assembled, ground and brushed to obtain a recyclable skateboard brick.

[0072] Part Three

[0073] The present invention also provides an application of the above-mentioned renewable sliding plate brick in a sliding gate mechanism.

[0074] Tests have shown that the renewable sliding plate bricks provided by this invention have an average service life of more than two uses after being installed and used in the sliding gate mechanism of a 120-ton steel ladle, which can meet the actual use requirements.

[0075] In summary, this invention successfully recycles used waste sliding plate bricks. Through sorting, cutting, crushing, hydration, drying, and sieving, recycled sliding plate particles and fine powder are obtained, which are then used to replace the original corundum material in a certain proportion. At the same time, liquid resin, high-alumina fine powder, carbon black, metallic aluminum powder, and antioxidants are added. Through mixing, rolling, molding, heat treatment, oil immersion, assembly, grinding, and brushing processes, a high-strength, low-porosity, and excellent resistance to molten steel erosion recyclable sliding plate brick has been successfully developed. This type of sliding plate brick can be recycled and reused through the above steps.

[0076] To further illustrate the present invention, the following embodiments provide a detailed description. The waste sliding plate bricks used in the following embodiments of the present invention are recycled waste sliding plate bricks from steel mills (the alumina content was tested to be in the range of 75-85%).

[0077] Example 1

[0078] I. Recycled skateboard pellets can be obtained through the following steps:

[0079] (1) The waste skateboard bricks are pretreated to remove the iron shell, iron hoop, veneer and iron shell assembly fire mud, clean the small steel pieces, steel slag and other debris remaining on the skateboard surface, remove the casting hole parts of the steel, and retain the uncorroded and deteriorated areas of the skateboard.

[0080] (2) The pre-treated waste skateboard bricks are crushed into 3~0 mm waste skateboard brick pre-treated material.

[0081] (3) The material obtained after crushing the waste skateboard bricks is put into the mixing hydration tank for treatment. The hydration cycle is about 20 days. During the hydration period, it is required to stir thoroughly at least once every half day to discharge the gas (CH4, NH3) generated during hydration, avoid the gas accumulation in the particles, isolate the moisture and slow down the hydration speed of the recycled skateboard particles.

[0082] (4) The recycled skateboard pellets after soaking in water (their XRD pattern is shown in the figure) Figure 1 The material (as shown) is dried at 170℃ for 6 hours. The moisture content of the recycled skateboard particles after drying should be ≤0.5%.

[0083] (5) The dried recycled skateboard particles are screened to obtain recycled skateboard particles of 3~1 mm and 1~0 mm and recycled skateboard fine powder of 0.088 mm.

[0084] The phase composition test results of recycled skateboard particles of 3~1 mm and 1~0 mm and recycled skateboard fine powder of 0.088 mm are shown in Table 1, Table 2 and Table 3, respectively. It can be seen that the easily hydrated phases AlN and Al4C3 in the recycled skateboard material have been cleaned up.

[0085] Table 1. Hydrate phase composition of 3~1 mm recycled skateboard particles

[0086]

[0087] Table 2. Hydrate phase composition of 1~0 mm recycled skateboard particles

[0088]

[0089] Table 3. Hydrated phase composition of 0.088 mm recycled skateboard fine powder

[0090]

[0091] II. Renewable skateboard bricks can be obtained through the following steps:

[0092] The above-processed recycled skateboard particles were used to prepare recycled skateboard bricks: 22 wt% recycled skateboard particles with a particle size of 3-1 mm, 15 wt% recycled skateboard particles with a particle size of 1-0 mm, 7 wt% recycled skateboard fine powder with a particle size of 0.088 mm, 8 wt% tabular corundum particles with a particle size of 2-1 mm, 5 wt% tabular corundum particles with a particle size of 1-0.5 mm, 6 wt% tabular corundum particles with a particle size of 0.5-0 mm, 11 wt% tabular corundum fine powder with a particle size of 0.044 mm, 12 wt% high-alumina fine powder with a particle size of 0.088 mm, 2.5 wt% antioxidant (the antioxidant includes boron carbide powder and silicon carbide powder, with a mass ratio of boron carbide powder to silicon carbide powder of 4:1), 1 wt% carbon black N220, 6 wt% metallic aluminum powder with a particle size of 0.088 mm, and 4.5 wt% phenolic resin.

[0093] The above raw materials are mixed and ground evenly by the following method: the treated recycled skateboard particles and plate-shaped corundum particles are mixed and ground for 2 minutes, resin is added and the mixture is ground for another 3 minutes, then recycled skateboard fine powder, plate-shaped corundum fine powder, high alumina fine powder, carbon black, metallic aluminum powder and antioxidant are added and the mixture is ground for another 15-20 minutes to make mud. After the mud is left to stand for 24 hours, it is molded, heat-treated, oil-immersed, assembled, ground and brushed to obtain the finished recycled skateboard brick.

[0094] The physicochemical properties of the renewable sliding gate bricks prepared in Example 1 are shown in Table 4. When the renewable sliding gate bricks are installed and used in the sliding gate mechanism of a 120-ton steel ladle, the average service life is 2.54 times, which can meet the actual use requirements.

[0095] Example 2

[0096] I. Recycled skateboard pellets can be obtained through the following steps:

[0097] (1) The waste skateboard bricks are pretreated to remove the iron shell, iron hoop, veneer and iron shell assembly fire mud, clean the small steel pieces, steel slag and other debris remaining on the skateboard surface, remove the casting hole parts of the steel, and retain the uncorroded and deteriorated areas of the skateboard.

[0098] (2) The pre-treated waste skateboard bricks are crushed into 3~0 mm waste skateboard brick pre-treated material.

[0099] (3) The material obtained after crushing the waste skateboard bricks is put into the mixing hydration tank for treatment. The hydration cycle is about 18 days. During the hydration period, it is required to stir thoroughly at least once every half day to discharge the gas generated during hydration, avoid gas accumulation in the particles, isolate moisture and slow down the hydration speed of the recycled skateboard particles.

[0100] (4) The recycled skateboard pellets after soaking in water are dried at 170°C for 6 hours. The moisture content of the dried recycled skateboard pellets should be ≤0.5%.

[0101] (5) The dried recycled skateboard particles are screened to obtain recycled skateboard particles of 3~1 mm and 1~0 mm and recycled skateboard fine powder of 0.088 mm.

[0102] II. Renewable skateboard bricks can be obtained through the following steps:

[0103] The above-processed recycled skateboard particles were used to prepare recycled skateboard bricks: 15 wt% recycled skateboard particles with a particle size of 3-1 mm, 13 wt% recycled skateboard particles with a particle size of 1-0 mm, 5 wt% recycled skateboard fine powder with a particle size of 0.088 mm, 20 wt% tabular corundum particles with a particle size of 2-1 mm, 8 wt% tabular corundum particles with a particle size of 1-0.5 mm, 5 wt% tabular corundum particles with a particle size of 0.5-0 mm, 11 wt% tabular corundum fine powder with a particle size of 0.044 mm, 12 wt% high-alumina fine powder with a particle size of 0.088 mm, 2.5 wt% antioxidant (the antioxidant includes boron carbide powder and silicon carbide powder, with a mass ratio of boron carbide powder to silicon carbide powder of 4:1), 1 wt% carbon black N220, 3 wt% metallic aluminum powder with a particle size of 0.088 mm, and 4.5 wt% phenolic resin.

[0104] The above raw materials are mixed and ground evenly by the following method: the treated recycled skateboard particles and plate-shaped corundum particles are mixed and ground for 2 minutes, resin is added and the mixture is ground for another 3 minutes, then recycled skateboard fine powder, plate-shaped corundum fine powder, high alumina fine powder, carbon black, metallic aluminum powder and antioxidant are added and the mixture is ground for another 15-20 minutes to make mud. After the mud is left to stand for 24 hours, it is molded, heat-treated, oil-immersed, assembled, ground and brushed to obtain the finished recycled skateboard brick.

[0105] The physicochemical properties of the renewable sliding gate bricks prepared in Example 2 are shown in Table 4. The renewable sliding gate bricks were installed and used in the sliding gate mechanism of a 120-ton steel ladle, with an average service life of 2.61 cycles, which can meet the actual use requirements.

[0106] Example 3

[0107] I. Recycled skateboard pellets can be obtained through the following steps:

[0108] (1) The waste skateboard bricks are pretreated to remove the iron shell, iron hoop, veneer and iron shell assembly fire mud, clean the small steel pieces, steel slag and other debris remaining on the skateboard surface, remove the casting hole parts of the steel, and retain the uncorroded and deteriorated areas of the skateboard.

[0109] (2) The pre-treated waste skateboard bricks are crushed into 3~0 mm waste skateboard brick pre-treated material.

[0110] (3) The material obtained after crushing the waste skateboard bricks is put into the mixing hydration tank for treatment. The hydration cycle is about 25 days. During the hydration period, it is required to stir thoroughly at least once every half day to discharge the gas generated during hydration, avoid gas accumulation in the particles, isolate moisture and slow down the hydration speed of the recycled skateboard particles.

[0111] (4) The recycled skateboard pellets after soaking in water are dried at 170°C for 6 hours. The moisture content of the dried recycled skateboard pellets should be ≤0.5%.

[0112] (5) The dried recycled skateboard particles are screened to obtain recycled skateboard particles of 3~1 mm and 1~0 mm and recycled skateboard fine powder of 0.088 mm.

[0113] II. Renewable skateboard bricks can be obtained through the following steps:

[0114] The above-processed recycled skateboard particles were used to prepare recycled skateboard bricks: 20 wt% recycled skateboard particles with a particle size of 3-1 mm, 19 wt% recycled skateboard particles with a particle size of 1-0 mm, 7 wt% recycled skateboard fine powder with a particle size of 0.088 mm, 10 wt% tabular corundum particles with a particle size of 2-1 mm, 3 wt% tabular corundum particles with a particle size of 1-0.5 mm, 7 wt% tabular corundum particles with a particle size of 0.5-0 mm, 15 wt% tabular corundum fine powder with a particle size of 0.044 mm, 8 wt% high-alumina fine powder with a particle size of 0.088 mm, 2.5 wt% antioxidant (the antioxidant includes boron carbide powder and silicon carbide powder, with a mass ratio of boron carbide powder to silicon carbide powder of 4:1), 1 wt% carbon black N220, 3 wt% metallic aluminum powder with a particle size of 0.088 mm, and 4.5 wt% phenolic resin.

[0115] The above raw materials are mixed and ground evenly by the following method: the treated recycled skateboard particles and plate-shaped corundum particles are mixed and ground for 2 minutes, resin is added and the mixture is ground for another 3 minutes, then recycled skateboard particle fine powder, plate-shaped corundum fine powder, high alumina fine powder, carbon black, metallic aluminum powder and antioxidant are added and the mixture is ground for another 15-20 minutes to make mud. After the mud is left to stand for 24 hours, it is molded, heat-treated, oil-immersed, assembled, ground and brushed to obtain the finished recycled skateboard brick.

[0116] The physicochemical properties of the renewable sliding gate bricks prepared in Example 3 are shown in Table 4. The renewable sliding gate bricks were installed and used in the sliding gate mechanism of a 120-ton steel ladle, with an average service life of 2.34 cycles, which can meet the actual use requirements.

[0117] Example 4

[0118] I. Recycled skateboard pellets can be obtained through the following steps:

[0119] (1) The waste skateboard bricks are pretreated to remove the iron shell, iron hoop, veneer and iron shell assembly fire mud, clean the small steel pieces, steel slag and other debris remaining on the skateboard surface, remove the casting hole parts of the steel, and retain the uncorroded and deteriorated areas of the skateboard.

[0120] (2) The pre-treated waste skateboard bricks are crushed into 3~0 mm waste skateboard brick pre-treated material.

[0121] (3) The material obtained after crushing the waste skateboard bricks is put into the mixing hydration tank for treatment. The hydration cycle is about 20 days. During the hydration period, it is required to stir thoroughly at least once every half day to discharge the gas generated by hydration, avoid gas accumulation in the particles, isolate moisture and slow down the hydration speed of the recycled skateboard particles.

[0122] (4) The recycled skateboard pellets after soaking in water are dried at 170°C for 6 hours. The moisture content of the dried recycled skateboard pellets should be ≤0.5%.

[0123] (5) The dried recycled skateboard particles are screened to obtain recycled skateboard particles of 3~1 mm and 1~0 mm and recycled skateboard fine powder of 0.088 mm.

[0124] II. Renewable skateboard bricks can be obtained through the following steps:

[0125] The above-treated recycled skateboard particles were used to prepare recycled skateboard bricks: 28 wt% recycled skateboard particles with a particle size of 3-1 mm, 20 wt% recycled skateboard particles with a particle size of 1-0 mm, 7 wt% recycled skateboard fine powder with a particle size of 0.088 mm, 4 wt% tabular corundum particles with a particle size of 2-1 mm, 6 wt% tabular corundum particles with a particle size of 1-0.5 mm, 5 wt% tabular corundum particles with a particle size of 0.5-0 mm, 11 wt% tabular corundum fine powder with a particle size of 0.044 mm, 8 wt% high-alumina fine powder with a particle size of 0.088 mm, 2.5 wt% antioxidant (the antioxidant includes boron carbide powder and silicon carbide powder, with a mass ratio of boron carbide powder to silicon carbide powder of 4:1), 1 wt% carbon black N220, 3 wt% metallic aluminum powder with a particle size of 0.088 mm, and 4.5 wt% phenolic resin.

[0126] The above raw materials are mixed and ground evenly by the following method: the treated recycled skateboard particles and plate-shaped corundum particles are mixed and ground for 2 minutes, resin is added and the mixture is ground for another 3 minutes, then recycled skateboard particle fine powder, plate-shaped corundum fine powder, high alumina fine powder, carbon black, metallic aluminum powder and antioxidant are added and the mixture is ground for another 15-20 minutes to make mud. After the mud is left to stand for 24 hours, it is molded, heat-treated, oil-immersed, assembled, ground and brushed to obtain the finished recycled skateboard brick.

[0127] The physicochemical properties of the renewable sliding gate bricks prepared in Example 4 are shown in Table 4. The renewable sliding gate bricks were installed and used in the sliding gate mechanism of a 120-ton steel ladle, with an average service life of 2.25 cycles, which can meet the actual use requirements.

[0128] Example 5

[0129] I. Recycled skateboard pellets can be obtained through the following steps:

[0130] (1) The waste skateboard bricks are pretreated to remove the iron shell, iron hoop, veneer and iron shell assembly fire mud, clean the small steel pieces, steel slag and other debris remaining on the skateboard surface, remove the casting hole parts of the steel, and retain the uncorroded and deteriorated areas of the skateboard.

[0131] (2) The pre-treated waste skateboard bricks are crushed into 3~0 mm waste skateboard brick pre-treated material.

[0132] (3) The material obtained after crushing the waste skateboard bricks is put into the mixing hydration tank for treatment. The hydration cycle is about 20 days. During the hydration period, it is required to stir thoroughly at least once every half day to discharge the gas generated by hydration, avoid gas accumulation in the particles, isolate moisture and slow down the hydration speed of the recycled skateboard particles.

[0133] (4) The recycled skateboard pellets after soaking in water are dried at 170°C for 6 hours. The moisture content of the dried recycled skateboard pellets should be ≤0.5%.

[0134] (5) The dried recycled skateboard particles are screened to obtain recycled skateboard particles of 3~1 mm and 1~0 mm and recycled skateboard fine powder of 0.088 mm.

[0135] II. Renewable skateboard bricks can be obtained through the following steps:

[0136] The above-processed recycled skateboard particles were used to prepare recycled skateboard bricks: 30 wt% recycled skateboard particles with a particle size of 3-1 mm, 10 wt% recycled skateboard particles with a particle size of 1-0 mm, 5 wt% recycled skateboard fine powder with a particle size of 0.088 mm, 12 wt% tabular corundum particles with a particle size of 2-1 mm, 6 wt% tabular corundum particles with a particle size of 1-0.5 mm, 3 wt% tabular corundum particles with a particle size of 0.5-0 mm, 10 wt% tabular corundum fine powder with a particle size of 0.044 mm, 10 wt% high-alumina fine powder with a particle size of 0.088 mm, 3.5 wt% antioxidant (the antioxidant includes boron carbide powder and silicon carbide powder, with a mass ratio of boron carbide powder to silicon carbide powder of 4:1), 3 wt% carbon black N220, 3 wt% metallic aluminum powder with a particle size of 0.088 mm, and 4.5 wt% phenolic resin.

[0137] The above raw materials are mixed and ground evenly by the following method: the treated recycled skateboard particles and plate-shaped corundum particles are mixed and ground for 2 minutes, resin is added and the mixture is ground for another 3 minutes, then recycled skateboard particle fine powder, plate-shaped corundum fine powder, high alumina fine powder, carbon black, metallic aluminum powder and antioxidant are added and the mixture is ground for another 15-20 minutes to make mud. After the mud is left to stand for 24 hours, it is molded, heat-treated, oil-immersed, assembled, ground and brushed to obtain the finished recycled skateboard brick.

[0138] The physicochemical properties of the renewable sliding gate bricks prepared in Example 5 are shown in Table 4. The renewable sliding gate bricks were installed and used in the sliding gate mechanism of a 120-ton steel ladle, with an average service life of 2.25 cycles, which can meet the actual use requirements.

[0139] Comparative Example 1

[0140] The difference from Example 1 is that in the preparation process of recycled skateboard pellets, the waste skateboard bricks were not subjected to the crushing treatment in step (2) and the hydration treatment in step (3). The remaining components and processes are consistent with those of Example 1.

[0141] The XRD pattern of the recycled material obtained in this comparative example is as follows: Figure 1 As shown.

[0142] The physicochemical properties of the renewable sliding plate bricks prepared in this comparative example are shown in Table 4. When the interior of the renewable sliding plate bricks is cut, obvious layer cracks are found, which affects normal use.

[0143] Comparative Example 2

[0144] The difference from Example 1 is that in the preparation process of recycled skateboard pellets, the waste skateboard bricks were not crushed in step (2), the steel casting hole was not removed, and the hydration treatment in step (3) was carried out directly. The remaining components and processes are consistent with those of Example 1.

[0145] The physicochemical properties of the renewable sliding plate bricks prepared in this comparative example are shown in Table 4. When the renewable sliding plate bricks are cut open, a small number of cracks are found inside, which affects normal use.

[0146] Comparative Example 3

[0147] The difference from Example 1 is that recycled skateboard particles were not used. Instead, the corresponding recycled skateboard particles of 3~1 mm, 1~0 mm, and 0.088 mm were replaced with equal amounts of tabular corundum particles of 3~1 mm, 1~0 mm, and 0.088 mm. The remaining components and processes are consistent with those of Example 1.

[0148] The physicochemical properties of the recycled skateboard bricks obtained in this comparative example are shown in Table 4. Comparison revealed that the service life of the recycled skateboard bricks produced in Examples 1-5 is essentially the same as that of the skateboard bricks produced using this method.

[0149] Comparative Example 4

[0150] The difference from Example 1 is that the recycled skateboard pellets used are obtained by high-temperature calcination of waste skateboard pellets to obtain corresponding recycled skateboard pellets of 3~1 mm, 1~0 mm, and 0.088 mm. The rest of the process is the same as in Example 1. The high-temperature calcination of waste skateboard pellets is obtained through the following steps.

[0151] (1) The waste skateboard bricks are pretreated to remove the iron shell, iron hoop, veneer and iron shell assembly fire mud, clean the small steel pieces, steel slag and other debris remaining on the skateboard surface, remove the casting hole parts of the steel, and retain the uncorroded and deteriorated areas of the skateboard.

[0152] (2) The pre-treated recyclable sliding bricks are crushed into 3~0 mm recycled sliding pre-treated material.

[0153] (3) The recycled material obtained after crushing the recycled skateboard was placed in a calcining furnace and calcined in an atmospheric atmosphere at 800°C for 5 hours. The recycled skateboard particles after calcination were screened to obtain recycled skateboard particles of 3-1 mm and 1-0 mm and recycled skateboard fine powder of 0.088 mm. The remaining components and processes were consistent with those in Example 1.

[0154] The XRD pattern of the recycled material after calcination is shown below. Figure 1 As shown, the aluminum carbide phase disappears, while the aluminum nitride phase remains. The physicochemical properties of the recycled sliding plate bricks obtained in this comparative example are shown in Table 4. Comparison revealed that the service life of the sliding plate bricks produced using this method is basically the same as that of Examples 1-5, but the processing cost resulting from high-temperature calcination is much higher than that from water immersion treatment. Furthermore, the incomplete removal of aluminum nitride poses a certain risk of hydration.

[0155] The physicochemical properties of the products prepared in the above embodiments and comparative examples of this invention are shown in Table 4. The porosity and bulk density were determined according to GB / T 2997-2000; the compressive strength was determined according to GB / T 5072-2008; the average number of continuous casting cycles (also understood as "average life") = total number of continuous casting heats / number of sliding plate sets consumed.

[0156] Table 4

[0157]

[0158] As shown in Table 4, compared with using pure tabular corundum as aggregate or recycled skateboard particles obtained through high-temperature calcination as aggregate, the physicochemical properties and actual service life of the skateboard bricks produced by using recycled skateboard particles obtained through water immersion treatment in Examples 1-5 as part of the aggregate are basically the same as the former. The water immersion treatment effectively reduces the processing cost of recycled skateboard bricks and promotes the reuse of waste skateboard brick resources.

[0159] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A renewable skateboard brick, characterized in that, By weight, it includes: 30-55 parts recycled skateboard pellets, 20-45 parts tabular corundum, 8-15 parts high-alumina fine powder, 0.5-4 parts carbon black, 1-6 parts metallic aluminum powder, 1-4 parts antioxidant, and 3-5.5 parts resin; The recycled skateboard granules are obtained by removing impurities, crushing and hydrating waste skateboard bricks; the recycled skateboard granules include recycled skateboard particles and recycled skateboard fine powder; the recycled skateboard granules include recycled skateboard particles with a particle size of 3~1 mm, recycled skateboard particles with a particle size of 1~0 mm and recycled skateboard fine powder with a particle size of 0.088 mm. The tabular corundum includes tabular corundum particles and tabular corundum fine powder.

2. The renewable sliding plate brick according to claim 1, characterized in that, After the crushing process, crushed particles of 3~0 mm are obtained; The hydration treatment involves sprinkling and / or soaking the crushed particles in water; the hydration treatment is carried out under stirring conditions, and the hydration treatment time is 15 to 20 days.

3. The renewable sliding brick according to claim 1 or 2, characterized in that, The hydration treatment also includes a drying treatment; The moisture content of the recycled skateboard pellets obtained after the drying process is ≤0.5 wt%.

4. The renewable sliding plate brick according to claim 1, characterized in that, The recycled skateboard pellets, by weight, include 15-30 parts of recycled skateboard pellets with a particle size of 3-1 mm, 10-20 parts of recycled skateboard pellets with a particle size of 1-0 mm, and 5-10 parts of recycled skateboard fine powder with a particle size of 0.088 mm.

5. The renewable sliding plate brick according to claim 1, characterized in that, The tabular corundum includes tabular corundum particles with a particle size of 2-1 mm, tabular corundum particles with a particle size of 1-0.5 mm, tabular corundum particles with a particle size of 0.5-0 mm, and tabular corundum fine powder with a particle size of 0.044 mm. The tabular alumina, by weight, comprises 4-20 parts of tabular alumina particles with a particle size of 2-1 mm, 3-8 parts of tabular alumina particles with a particle size of 1-0.5 mm, 3-7 parts of tabular alumina particles with a particle size of 0.5-0 mm, and 10-15 parts of fine tabular alumina powder with a particle size of 0.044 mm.

6. The renewable sliding plate brick according to claim 1, characterized in that, The particle size of the high-alumina fine powder is 0.044~0.088 mm; The particle size of the aluminum powder is 0.044~0.088 mm.

7. The renewable sliding plate brick according to claim 1, characterized in that, The carbon black includes, but is not limited to, carbon black N220; The resins include, but are not limited to, phenolic resins and / or silicone resins.

8. The renewable sliding plate brick according to claim 1, characterized in that, The antioxidants include boron carbide powder and silicon carbide powder; The antioxidant, by weight, comprises 0.2 to 1 part boron carbide powder and 1 to 2 parts silicon carbide powder.

9. A method for preparing a renewable sliding plate brick as described in any one of claims 1 to 8, characterized in that, Includes the following steps: After the recycled skateboard particles and tabular corundum particles are mixed evenly, resin is added and mixing continues. Then, recycled skateboard fine powder, tabular corundum fine powder, high alumina fine powder, carbon black, metallic aluminum powder and antioxidant are added to make mud. After post-processing, renewable skateboard bricks are obtained.

10. The renewable sliding brick according to any one of claims 1 to 8 or Application of the renewable sliding plate brick prepared by the preparation method according to claim 9 in the sliding gate mechanism.

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