Dry-hanging hollow ceramic plate prepared from gasified slag and preparation method of dry-hanging hollow ceramic plate

Abstract

The invention provides a dry-hanging hollow ceramic plate prepared from gasified slag. The ceramic plate is prepared from the following raw materials in parts by weight: 40-60 parts of gasified slag, 35-70 parts of mine spoil, 5-20 parts of quartz, 5-20 parts of kaolin and 5-15 parts of a fluxing agent. The industrial solid waste slag and the mine spoil are used as main raw materials for producing the ceramic plate, so that the problem of stockpiling of the gasified slag and the mine spoil is solved, and the production cost is reduced. According to the invention, the drying section and the firing section adopt a stepped temperature mode, plastic raw materials are the key for high flatness of extrusion molded products, mine spoil and kaolin are plastic raw materials, the extruded products are high in water content, the principle followed by wet green body drying is temperature and humidity control, uniform ventilation and gradient drying, the drying speed is prevented from being too high, and the product quality is improved. Cracking and deformation of the product are caused; in the sintering section, stepped sintering is carried out at 300-1050 DEG C, cracking and bending phenomena are avoided, heat preservation is carried out at 800 DEG C to promote sufficient oxidation of carbon residues and avoid black cores, and heat preservation is carried out at 1050 DEG C to enable products to be heated uniformly and shrink consistently.

Description

Technical Field

[0001] This invention relates to the field of inorganic solid waste recycling technology, and in particular to a dry-hanging hollow ceramic slab prepared using gasification slag and its preparation method. Background Technology

[0002] Coal gasification technology is an important way to utilize clean coal. With the continuous expansion of coal gasification scale, the annual emissions of its solid byproduct, coal gasification slag, are also increasing. Coal gasification slag typically contains oxides of silicon, aluminum, iron, calcium, and a small amount of unburned residual carbon, making it a typical industrial solid waste. Currently, the vast majority of coal gasification slag is disposed of through open-air stockpiling or direct landfilling. This not only occupies a large amount of land resources in the long term, but also makes it susceptible to erosion by wind and rain during storage, leading to the leaching of heavy metal ions and causing secondary pollution to surrounding water bodies and soil. Fine particulate matter dust also affects air quality, posing a potential threat to the ecological environment and human health.

[0003] In existing technologies, the main ways to utilize coal gasification slag include road construction, backfilling, cement admixtures, and building material preparation. However, these applications generally suffer from limited capacity, low added value, and poor process adaptability. Particularly in the preparation of high-performance ceramic building materials, the poor plasticity, large compositional fluctuations, and residual carbon content of the gasification slag mean that direct use in sintering products can easily lead to defects such as drying cracks and "black core" defects during firing, affecting the product's appearance and mechanical properties. Summary of the Invention

[0004] This invention provides a dry-hanging hollow ceramic slab prepared using gasification slag and its preparation method, in order to solve the problems mentioned in the background art.

[0005] This invention provides a dry-hanging hollow ceramic slab prepared using gasification slag. The ceramic slab comprises the following raw materials in parts by weight: 20-60 parts of gasification slag, 35-70 parts of mine waste soil, 5-25 parts of quartz, 5-25 parts of kaolin, and 5-15 parts of flux.

[0006] Optionally, the terracotta panel comprises the following raw materials in parts by weight: 30-50 parts gasification slag, 45-60 parts mine waste soil, 5-15 parts quartz, 10-15 parts kaolin, and 5-10 parts flux.

[0007] Optionally, the flux includes one or more of potassium feldspar, sodium feldspar, and talc.

[0008] This invention also provides a method for preparing dry-hanging hollow ceramic slabs using gasification slag, comprising the following steps: S1: Raw material pretreatment: The gasification slag is screened, and the coarse particles above 80 mesh are pre-calcined at 500℃. The pre-calcined coarse particles and fine powder are ground to below 0.074mm by a ball mill, and the mine waste soil is crushed to below 0.25mm by a crusher. S2: Ingredients: Weigh the following raw materials according to the following weight proportions: 20-60 parts of gasification slag, 35-70 parts of mine waste soil, 5-25 parts of quartz, 5-25 parts of kaolin, and 5-15 parts of flux. S3: Mixing: Put the weighed raw materials into a planetary mixer and mix them evenly; S4: Mud preparation: Add water to the well-mixed raw materials at a ratio of 15-18% of the ingredients and stir to prepare mud. Place the prepared mud into an aging chamber for aging for 48 hours. S5: Molding: The mud processed in S4 is mixed and kneaded using a twin-shaft mixer. The kneaded mud is then fed into a vacuum extruder and formed into a product through a mold. The blank is cut according to the product specifications to obtain a wet blank. S6: Drying: Place the wet green body obtained in S5 in the shade at room temperature. After the green body has a certain strength, place it in a drying oven with a temperature range of 40-105℃ for further drying, so that the moisture content of the dried green body is <0.5%. S7: Firing: Place the dried green body obtained in S6 into a muffle furnace and calcine it at 300-1050℃. After calcination, keep it at the temperature and then cool it to obtain the dry-hanging hollow ceramic slab.

[0009] Optionally, when drying S6, it is first air-dried at room temperature, then dried at 40-60℃ for 2-3 hours, and then dried at 80-105℃ for 1-2 hours.

[0010] Optionally, the calcination and heat preservation process in S7 is as follows: first, calcination is carried out at 300-800℃ for 2-3 hours, and after calcination, heat preservation is carried out at 800℃ for 30 minutes; then, calcination is continued at 800-1050℃ for 2-3 hours, and after calcination, heat preservation is carried out at 1050℃ for 30 minutes.

[0011] The beneficial effects of the dry-hanging hollow ceramic slab prepared using gasification slag and its preparation method provided by this invention include: (1) The main raw materials for producing ceramic slabs in this invention are gasification slag and mine waste soil, both of which are industrial solid wastes. Long-term storage will occupy a large amount of land and pollute the environment. This invention solves the problem of storage of gasification slag and mine waste soil and reduces production costs.

[0012] (2) In this invention, the drying section and the firing section adopt a stepped temperature method. The extrusion molding requires plastic raw materials, and the extruded products have a high moisture content. The drying process must be stepped to avoid the drying speed being too fast, which would cause the products to crack and deform. The firing section adopts a stepped temperature method. The gasification slag contains unreacted residual carbon. The heating rate is controlled at 600-1000℃, and the temperature is maintained at 800℃ and 1000℃ respectively to ensure that the residual carbon in the green body is fully burned, thus solving the problem of black core during the firing process.

[0013] (3) The production process of ceramic slabs is extrusion molding. The key to extrusion molding is the selection of raw material plasticity. Gasification slag is a barren material. The purpose of adding mine waste soil and kaolin is to improve plasticity. A suitable formula system ensures that the product is extruded, the green body is dried without defects, and the firing shrinkage is moderate. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of the present invention.

[0015] This invention provides a dry-hanging hollow ceramic slab prepared using gasification slag. The ceramic slab comprises the following raw materials in parts by weight: 20-60 parts of gasification slag, 35-70 parts of mine waste soil, 5-25 parts of quartz, 5-25 parts of kaolin, and 5-15 parts of flux.

[0016] Furthermore, the terracotta panel comprises the following raw materials in parts by weight: 30-50 parts gasification slag, 45-60 parts mine waste soil, 5-15 parts quartz, 10-15 parts kaolin, and 5-10 parts flux.

[0017] Furthermore, the flux includes one or more of potassium feldspar, sodium feldspar, and talc.

[0018] This invention also provides a method for preparing dry-hanging hollow ceramic slabs using gasification slag, comprising the following steps: S1: Raw material pretreatment: The gasification slag is screened, and the coarse particles above 80 mesh are pre-calcined at 500℃. The pre-calcined coarse particles and fine powder are ground to below 0.074mm by a ball mill, and the mine waste soil is crushed to below 0.25mm by a crusher. S2: Ingredients: Weigh the following raw materials according to the following weight proportions: 20-60 parts of gasification slag, 35-70 parts of mine waste soil, 5-25 parts of quartz, 5-25 parts of kaolin, and 5-15 parts of flux. S3: Mixing: Put the weighed raw materials into a planetary mixer and mix them evenly; S4: Mud preparation: Add water to the well-mixed raw materials at a ratio of 15-18% of the ingredients and stir to prepare mud. Place the prepared mud into an aging chamber for aging for 48 hours. S5: Molding: The mud processed in S4 is mixed and kneaded using a twin-shaft mixer. The kneaded mud is then fed into a vacuum extruder and formed into a product through a mold. The blank is cut according to the product specifications to obtain a wet blank. S6: Drying: Place the wet green body obtained in S5 in the shade at room temperature. After the green body has a certain strength, place it in a drying oven with a temperature range of 40-105℃ for further drying, so that the moisture content of the dried green body is <0.5%. S7: Firing: Place the dried green body obtained in S6 into a muffle furnace and calcine it at 300-1050℃. After calcination, keep it at the temperature and then cool it to obtain the dry-hanging hollow ceramic slab.

[0019] Furthermore, during the drying process in S6, the product is first air-dried at room temperature, then dried at 40-60℃ for 2-3 hours, and then dried at 80-105℃ for 1-2 hours.

[0020] Furthermore, the calcination and heat preservation process in S7 is as follows: First, calcination is carried out at 300-800℃ for 2-3 hours, and after calcination, heat preservation is carried out at 800℃ for 30 minutes; then, calcination is continued at 800-1050℃ for 2-3 hours, and after calcination, heat preservation is carried out at 1050℃ for 30 minutes.

[0021] The present invention will be further described in detail below with reference to specific embodiments.

[0022] Example 1 A type of dry-hanging hollow ceramic slab prepared using gasification slag, comprising the following raw materials in parts by weight: 20 parts gasification slag, 35 parts mine waste soil, 5 parts quartz, 5 parts kaolin, and 5 parts flux. The flux is potassium feldspar.

[0023] A method for preparing dry-hanging hollow ceramic slabs using gasification slag includes the following steps: S1: Raw material pretreatment: The gasification slag is screened, and the coarse particles above 80 mesh are pre-calcined at 500℃. The pre-calcined coarse particles and fine powder are ground to below 0.074mm by a ball mill, and the mine waste soil is crushed to below 0.25mm by a crusher. S2: Ingredients: Weigh the raw materials according to the above requirements; S3: Mixing: Put the weighed raw materials into a planetary mixer and mix them evenly; S4: Mud preparation: Add water to the well-mixed raw materials at a ratio of 18% of the ingredients and stir to prepare mud. Place the prepared mud into an aging chamber for aging for 48 hours. S5: Molding: The mud processed in S4 is mixed and kneaded using a twin-shaft mixer. The kneaded mud is then fed into a vacuum extruder and formed into a product through a mold. The blank is cut according to the product specifications to obtain a wet blank. S6: Drying: Place the wet green body obtained in S5 in the air at room temperature to dry. After the green body has a certain strength, dry it at 40℃ for 2 hours, and then dry it at 80℃ for 1 hour. S7: Firing: Place the dried blank obtained in S6 into a muffle furnace and calcine it at 300℃ for 2 hours. After calcination, hold it at 800℃ for 30 minutes. Then continue calcining at 800℃ for 2 hours. After calcination, hold it at 1050℃ for 30 minutes. After holding, cool it to obtain the dry-hanging hollow ceramic slab.

[0024] Example 2 A type of dry-hanging hollow ceramic slab prepared using gasification slag, the ceramic slab comprising the following raw materials in parts by weight: 60 parts gasification slag, 70 parts mine waste soil, 25 parts quartz, 25 parts kaolin, and 15 parts flux, wherein the flux is albite.

[0025] A method for preparing dry-hanging hollow ceramic slabs using gasification slag includes the following steps: S1: Raw material pretreatment: The gasification slag is screened, and the coarse particles above 80 mesh are pre-calcined at 500℃. The pre-calcined coarse particles and fine powder are ground to below 0.074mm by a ball mill, and the mine waste soil is crushed to below 0.25mm by a crusher. S2: Ingredients: Weigh the raw materials according to the above requirements; S3: Mixing: Put the weighed raw materials into a planetary mixer and mix them evenly; S4: Mud preparation: Add water to the well-mixed raw materials at a ratio of 15% to the ingredients and stir to prepare mud. Place the prepared mud into an aging chamber for aging for 48 hours. S5: Molding: The mud processed in S4 is mixed and kneaded using a twin-shaft mixer. The kneaded mud is then fed into a vacuum extruder and formed into a product through a mold. The blank is cut according to the product specifications to obtain a wet blank. S6: Drying: Place the wet green body obtained in S5 in the air at room temperature to dry. After the green body has a certain strength, dry it at 60℃ for 3 hours, and then dry it at 105℃ for 2 hours. S7: Firing: The dried blank obtained in S6 is placed in a muffle furnace and first calcined at 800℃ for 3 hours. After calcination, it is held at 800℃ for 30 minutes. Then, it is calcined at 1050℃ for another 3 hours. After calcination, it is held at 1050℃ for 30 minutes. After holding, it is cooled to obtain the dry-hanging hollow ceramic slab.

[0026] Example 3 A type of dry-hanging hollow ceramic slab prepared using gasification slag, comprising the following raw materials in parts by weight: 40 parts gasification slag, 55 parts mine waste soil, 15 parts quartz, 15 parts kaolin, and 10 parts flux. The flux is talc.

[0027] A method for preparing dry-hanging hollow ceramic slabs using gasification slag includes the following steps: S1: Raw material pretreatment: The gasification slag is screened, and the coarse particles above 80 mesh are pre-calcined at 500℃. The pre-calcined coarse particles and fine powder are ground to below 0.074mm by a ball mill, and the mine waste soil is crushed to below 0.25mm by a crusher. S2: Ingredients: Weigh the raw materials according to the above requirements; S3: Mixing: Put the weighed raw materials into a planetary mixer and mix them evenly; S4: Mud preparation: Add water to the well-mixed raw materials at a ratio of 16% of the ingredients and stir to prepare mud. Place the prepared mud into an aging chamber for aging for 48 hours. S5: Molding: The mud processed in S4 is mixed and kneaded using a twin-shaft mixer. The kneaded mud is then fed into a vacuum extruder and formed into a product through a mold. The blank is cut according to the product specifications to obtain a wet blank. S6: Drying: Place the wet green body obtained in S5 in the air at room temperature to dry. After the green body has a certain strength, dry it at 50℃ for 2 hours, and then dry it at 90℃ for 1 hour. S7: Firing: The dried blank obtained in S6 is placed in a muffle furnace and first calcined at 500℃ for 3 hours. After calcination, it is held at 800℃ for 30 minutes. Then, it is calcined at 900℃ for another 2 hours. After calcination, it is held at 1050℃ for 30 minutes. After holding, it is cooled to obtain the dry-hanging hollow ceramic slab.

[0028] Example 4 A type of dry-hanging hollow ceramic slab prepared using gasification slag, comprising the following raw materials in parts by weight: 30 parts gasification slag, 45 parts mine waste soil, 5 parts quartz, 10 parts kaolin, and 5 parts flux. The flux consists of two parts potassium feldspar and three parts talc.

[0029] A method for preparing dry-hanging hollow ceramic slabs using gasification slag includes the following steps: S1: Raw material pretreatment: The gasification slag is screened, and the coarse particles above 80 mesh are pre-calcined at 500℃. The pre-calcined coarse particles and fine powder are ground to below 0.074mm by a ball mill, and the mine waste soil is crushed to below 0.25mm by a crusher. S2: Ingredients: Weigh the raw materials according to the above requirements; S3: Mixing: Put the weighed raw materials into a planetary mixer and mix them evenly; S4: Mud preparation: Add water to the well-mixed raw materials at a ratio of 18% of the ingredients and stir to prepare mud. Place the prepared mud into an aging chamber for aging for 48 hours. S5: Molding: The mud processed in S4 is mixed and kneaded using a twin-shaft mixer. The kneaded mud is then fed into a vacuum extruder and formed into a product through a mold. The blank is cut according to the product specifications to obtain a wet blank. S6: Drying: Place the wet green body obtained in S5 in the air at room temperature to dry. After the green body has a certain strength, dry it at 40℃ for 3 hours, and then dry it at 95℃ for 2 hours. S7: Firing: The dried blank obtained in S6 is placed in a muffle furnace and first calcined at 400℃ for 3 hours. After calcination, it is held at 800℃ for 30 minutes. Then, it is calcined at 1000℃ for 2 hours. After calcination, it is held at 1050℃ for 30 minutes. After holding, it is cooled to obtain the dry-hanging hollow ceramic slab.

[0030] Example 5 A type of dry-hanging hollow ceramic slab prepared using gasification slag, comprising the following raw materials in parts by weight: 50 parts gasification slag, 60 parts mine waste soil, 15 parts quartz, 15 parts kaolin, and 10 parts flux. The flux consists of 3 parts potassium feldspar, 3 parts sodium feldspar, and 4 parts talc.

[0031] A method for preparing dry-hanging hollow ceramic slabs using gasification slag includes the following steps: S1: Raw material pretreatment: The gasification slag is screened, and the coarse particles above 80 mesh are pre-calcined at 500℃. The pre-calcined coarse particles and fine powder are ground to below 0.074mm by a ball mill, and the mine waste soil is crushed to below 0.25mm by a crusher. S2: Ingredients: Weigh the raw materials according to the above requirements; S3: Mixing: Put the weighed raw materials into a planetary mixer and mix them evenly; S4: Mud preparation: Add water to the well-mixed raw materials at a ratio of 16% of the ingredients and stir to prepare mud. Place the prepared mud into an aging chamber for aging for 48 hours. S5: Molding: The mud processed in S4 is mixed and kneaded using a twin-shaft mixer. The kneaded mud is then fed into a vacuum extruder and formed into a product through a mold. The blank is cut according to the product specifications to obtain a wet blank. S6: Drying: Place the wet green body obtained in S5 in the air at room temperature to dry. After the green body has a certain strength, dry it at 60℃ for 2 hours, and then dry it at 100℃ for 2 hours. S7: Firing: The dried green body obtained in S6 is placed in a muffle furnace and first calcined at 400℃ for 3 hours. After calcination, it is held at 800℃ for 30 minutes. Then, it is calcined at 900℃ for another 3 hours. After calcination, it is held at 1050℃ for 30 minutes. After holding, it is cooled to obtain the dry-hanging hollow ceramic slab.

[0032] Comparative Example 1 The only difference between Comparative Example 1 and Example 3 is that the raw materials for the ceramic slab in Comparative Example 1 consist of only 40 parts of gasification slag and 55 parts of mine waste soil.

[0033] Comparative Example 2 The only difference between Comparative Example 2 and Example 3 is that no flux was added to the raw materials of the ceramic slab in Comparative Example 2.

[0034] Comparative Example 3 The only difference between Comparative Example 3 and Example 3 is that kaolin was not added to the raw materials of the ceramic slab in Comparative Example 3.

[0035] Comparative Example 4 The only difference between Comparative Example 4 and Example 3 is that the gasification slag in S1 of Comparative Example 4 was not screened and sintered.

[0036] Comparative Example 5 The only difference between Comparative Example 5 and Example 3 is that in Comparative Example 5, S7 was sintered directly at 1150°C for 5 hours.

[0037] Note: The wet blank dimensions obtained in Examples 1-5 and Comparative Examples 1-5 are all 100*50*20 (mm).

[0038] The performance of the terracotta panels obtained in Examples 1-5 and Comparative Examples 1-5 was tested, and the test results are shown in Table 1: Table 1 Water absorption rate % Destructive strength (MPa) Example 1 2.5 38 Example 2 2.7 35 Example 3 1.9 47 Example 4 2.4 40 Example 5 2.8 36 Comparative Example 1 3.4 29 Comparative Example 2 3.1 30 Comparative Example 3 2.9 33 Comparative Example 4 3.5 28 Comparative Example 5 4.2 24 The gasification slag in Examples 1-5 and Comparative Examples 1-5 came from Yulin, Shaanxi Province, and the mine waste soil came from Ganquan, Shaanxi Province. The chemical composition of the gasification slag and mine waste soil is shown in Table 2. Table 2 This invention provides a method for preparing dry-hanging hollow ceramic slabs using gasification slag. The gasification slag serves as the main silica-alumina raw material, providing SiO2, Al2O3, and other ceramic matrix components. Using gasification slag as a raw material solves the problem of slag storage and reduces the raw material cost of the dry-hanging hollow ceramic slabs. Mine waste soil provides plasticity to the dry-hanging hollow ceramic slabs, improving their molding performance. It compensates for the lack of lean material in gasification slag, ensuring a smooth and crack-free extruded green body. Using mine waste soil also reduces land occupation and environmental pollution. Quartz, as an aggregate, reduces firing shrinkage and increases the strength of the green body. Kaolin provides plasticity and adhesion to the slabs, working synergistically with the mine waste soil to ensure the integrity of the extruded green body. Furthermore, kaolin transforms into mullite at high temperatures, further enhancing the ceramic structure. Flux lowers the firing temperature.

[0039] The raw materials for the ceramic slabs in Comparative Example 1 only contain gasification slag and mine waste soil, lacking other auxiliary components. As can be seen from the data in Table 1, the products in Comparative Example 1 have large firing shrinkage, high water absorption, and low strength.

[0040] No flux was added to the raw materials of the ceramic slab in Comparative Example 2, and the firing temperature was too high. As can be seen from the data in Table 1, its product has high water absorption and low strength.

[0041] In Comparative Example 3, no kaolin was added to the raw material of the terracotta panel, and no large amount of mullite phase was produced under high temperature sintering. As can be seen from the data in Table 1, the strength of the terracotta panel decreased significantly after firing.

[0042] The pre-firing process in the raw material pretreatment of the preparation method can burn off the residual char in the coarse particles in advance, avoiding black core formation. After fine grinding, the particles are uniform, which is beneficial for mixing and sintering. In Comparative Example 4, no sieving and pre-firing were performed when preparing dry-hanging hollow ceramic panels, resulting in a black core problem, high water absorption, and low strength in the finished product.

[0043] Stepped sintering avoids uneven heating during the green body sintering process, preventing cracks and bending. Holding at 800℃ promotes full oxidation of residual carbon and avoids black core formation. Holding at 1050℃ ensures uniform heating and consistent shrinkage. In Comparative Example 5, direct high-temperature firing resulted in incomplete combustion of residual carbon in the raw materials, leading to high water absorption and extremely low strength.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dry-hanging hollow ceramic slab prepared using gasification slag, characterized in that, The terracotta panel comprises the following raw materials in parts by weight: 20-60 parts gasification slag, 35-70 parts mine waste soil, 5-25 parts quartz, 5-25 parts kaolin, and 5-15 parts flux.

2. The dry-hanging hollow ceramic slab prepared using gasification slag according to claim 1, characterized in that, The terracotta panel comprises the following raw materials in parts by weight: 30-50 parts gasification slag, 45-60 parts mine waste soil, 5-15 parts quartz, 10-15 parts kaolin, and 5-10 parts flux.

3. The dry-hanging hollow ceramic slab prepared using gasification slag according to claim 1, characterized in that, The flux includes one or more of potassium feldspar, sodium feldspar, and talc.

4. A method for preparing dry-hanging hollow ceramic slabs using gasification slag as described in any one of claims 1-3, characterized in that, Includes the following steps: S1: Raw material pretreatment: The gasification slag is screened, and the coarse particles above 80 mesh are pre-calcined at 500℃. The pre-calcined coarse particles and fine powder are ground to below 0.074mm by a ball mill, and the mine waste soil is crushed to below 0.25mm by a crusher. S2: Ingredients: Weigh the following raw materials according to the following weight proportions: 20-60 parts of gasification slag, 35-70 parts of mine waste soil, 5-25 parts of quartz, 5-25 parts of kaolin, and 5-15 parts of flux. S3: Mixing: Put the weighed raw materials into a planetary mixer and mix them evenly; S4: Mud preparation: Add water to the well-mixed raw materials at a ratio of 15-18% of the ingredients and stir to prepare mud. Place the prepared mud into an aging chamber for aging for 48 hours. S5: Molding: The mud processed in S4 is mixed and kneaded using a twin-shaft mixer. The kneaded mud is then fed into a vacuum extruder and formed into a product through a mold. The blank is cut according to the product specifications to obtain a wet blank. S6: Drying: Place the wet green body obtained in S5 in the shade at room temperature. After the green body has a certain strength, place it in a drying oven with a temperature range of 40-105℃ for further drying, so that the moisture content of the dried green body is <0.5%. S7: Firing: The dried blank obtained in S6 is placed in a muffle furnace and calcined at 300-1050℃. After calcination, the blank is kept at a certain temperature and then cooled to obtain the dry-hanging hollow ceramic slab.

5. The method for preparing dry-hanging hollow ceramic slabs using gasification slag according to claim 4, characterized in that, During the drying process in S6, the product is first air-dried at room temperature, then dried at 40-60℃ for 2-3 hours, and finally dried at 80-105℃ for 1-2 hours.

6. The method for preparing dry-hanging hollow ceramic slabs using gasification slag according to claim 5, characterized in that, The calcination and heat preservation process in S7 is as follows: First, calcination is carried out at 300-800℃ for 2-3 hours, and after calcination, heat preservation is carried out at 800℃ for 30 minutes; then, calcination is continued at 800-1050℃ for 2-3 hours, and after calcination, heat preservation is carried out at 1050℃ for 30 minutes.

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