Micro-pore high-purity aluminum-silicon high-temperature-resistant rotary kiln lining material and preparation method thereof

Abstract

The invention relates to the technical field of refractory materials, in particular to a microporous high-purity aluminum-silicon high-temperature-resistant rotary kiln lining material which comprises the following components in percentage by weight: 1-5% of alpha-Al2O3 micro powder, 1-5% of alumina micro powder, 1-5% of alumina micro powder and the balance of alumina micro powder. 2 to 6 percent of bauxite; 5-10% of silicon dioxide micro powder; 1 to 3 percent of soft clay; 0.3 to 0.5 percent of modified industrial solid waste; 0.1%-0.3% of a water reducing agent; 0.1%-0.3% of a binding agent; and the balance of tabular corundum. The preparation method of the lining material comprises the following steps: S1, preparing the hard layer and the soft layer; s2, coating according to a sequence from a soft layer to a hard layer to obtain a pre-shaped material; s3, sintering the pre-shaped material to obtain a lining material; the lining material prepared by the invention is of a soft and hard alternate nacreous layer imitating structure, and the interface thermal stress can be reduced, so that the high temperature resistance and thermal shock resistance of the lining material are improved.

Description

Technical Field

[0001] This invention relates to the field of refractory materials technology, specifically to a microporous high-purity aluminum-silicon refractory rotary kiln lining material and its preparation method. Background Technology

[0002] The function of kiln lining in rotary kilns is to protect the kiln shell from high-temperature damage, provide insulation, and reduce heat loss. Industrial solid waste typically contains abundant oxides, such as alumina and magnesium oxide, which are important components of refractory materials. Furthermore, if industrial solid waste is not properly treated, its long-term accumulation not only occupies large amounts of land and increases economic costs, but also seriously harms the ecological environment.

[0003] Therefore, this invention proposes to design a microporous high-purity aluminum-silicon refractory rotary kiln lining material and its preparation method, combining industrial solid waste with aluminum-silicon refractory materials to further improve the performance of the aluminum-silicon lining material. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a microporous high-purity aluminum-silicon resistant high-temperature rotary kiln lining material and its preparation method.

[0005] A microporous high-purity aluminum-silicon resistant high-temperature rotary kiln lining material, comprising the following components by weight percentage:

[0006] α-Al₂O₃ micro powder: 1–5%;

[0007] Bauxite: 2-6%;

[0008] Silica micro powder: 5-10%;

[0009] Soft clay: 1-3%;

[0010] Modified industrial solid waste: 0.3-0.5%;

[0011] Water-reducing agent: 0.1-0.3%;

[0012] Binder: 0.1–0.3%;

[0013] Tabular corundum: Balance.

[0014] Furthermore, the particle size of the tabular corundum is 0–5 mm; the particle size of the α-Al₂O₃ micro powder is 1–5 μm; the particle size of the bauxite is 0–5 mm; and the particle size of the silica micro powder is 1–5 μm.

[0015] Note: The particle size of the above raw materials is designed to form a coarse aggregate skeleton and a dense packing structure of fine powder, which ensures high density while achieving controllable micropores, thus meeting the requirements of strength, thermal shock stability and erosion resistance of the lining material.

[0016] Furthermore, the method for preparing the modified industrial solid waste is as follows:

[0017] Industrial solid waste is crushed, ground, and sieved to obtain fragments with a particle size of 60-80 μm. The fragments are then evaporated until the moisture content is ≤10%, pressurized to 0.4-0.5 MPa, and hot steam at 105-110°C is introduced. The mixture is stirred at 90-110 r / min for 5-15 min in the hot steam environment. After stirring, the fragments are separated into solid phase A and solid phase B with a mass ratio of 1:3-5.

[0018] Solid phase A is treated with acid to obtain solid waste fiber. The solid waste fiber is then dispersed in polyvinyl alcohol solution at a solid-liquid ratio of 1g:15-30ml. During the dispersion process, a high voltage electric field with an electric field strength of 50-60kV is applied for 10-20min to obtain fiber bundle.

[0019] Solid phase B and the modifier are mixed at a mass ratio of 4 to 7:1 and reacted for 2.5 to 4.5 hours. The reaction product is then mixed with sulfite pulp at a solid-liquid ratio of 1 g to 15 to 25 ml and heated at 105 to 115 °C for 30 to 40 minutes to obtain the pulp.

[0020] The slurry is evenly sprayed onto the surface of the fiber bundle and sintered at 900–1050℃ for 1.5–2.5 h to obtain modified industrial solid waste.

[0021] Explanation: Industrial solid waste is activated on the particle surface and optimized in terms of internal pores through evaporation and steam stirring, providing a physical basis for subsequent acid treatment and fiber dispersion. The fibers obtained after acid treatment of solid phase A are dispersed in a polyvinyl alcohol solution under a high-voltage electric field to form oriented fiber bundles. This fiber network can significantly improve the flexural strength and fracture toughness of the material. Solid phase B, combined with modifiers and sulfite pulp, forms a microporous slurry, which combines with the fiber bundles to reduce the thermal conductivity of the material and improve its thermal insulation performance. The high-toughness fiber bundles are located inside to buffer thermal stress, while the highly dense slurry distributed on the outer layer enhances the wear resistance of the modified industrial solid waste, achieving performance zoning optimization.

[0022] Furthermore, the modifier is calcium carbonate or silicate.

[0023] Note: Calcium carbonate and silicate are used as modifiers to improve the overall performance of industrial solid waste-based refractory materials by enhancing mechanical strength, thermal conductivity, and high-temperature stability, respectively.

[0024] Furthermore, the industrial solid waste is selected from any one of coal gangue, fly ash, and blast furnace slag.

[0025] Note: Coal gangue and fly ash contain substances such as silicon dioxide, which help improve the thermal insulation performance of refractory materials; blast furnace slag does not contain free calcium oxide and has high stability.

[0026] Further, the acid treatment method is as follows: solid phase A is treated in an acid solution with a pH of 4.5-5 and a temperature of 40-60°C at a solid-liquid ratio of 1g:5-8ml for 2-4 hours, wherein the acid solution is a sulfuric acid solution with a mass concentration of 10-20%.

[0027] Note: Sulfuric acid preferentially dissolves impurities such as Fe2O3 and CaO in solid waste under acidic conditions, while retaining the aluminum-silicon main phase, thus improving the purity of solid waste fibers.

[0028] Furthermore, the water-reducing agent is any one of FS10, sodium tripolyphosphate, and sodium hexametaphosphate.

[0029] Note: The above-mentioned water-reducing agent can reduce the fluidity of the raw materials for the lining material during the preparation process and has thermal stability.

[0030] Furthermore, the binder is aluminum dihydrogen phosphate.

[0031] Note: Aluminum dihydrogen phosphate can firmly bind various refractory aggregates together. Under high temperature conditions, aluminum dihydrogen phosphate will gradually transform into a stable ceramic phase, continue to play a binding role, and maintain the structural strength of the refractory material.

[0032] A method for preparing a microporous high-purity aluminum-silicon resistant high-temperature rotary kiln lining material as described in any of the above claims includes the following steps:

[0033] S1. The main materials are tabular corundum, α-Al2O3 micro powder, bauxite, silica micro powder, and water-reducing agent.

[0034] By weight percentage, 65-75% of the main material, 15-20% of the modified industrial solid waste, 20-30% of the soft clay, and 70-80% of the binder are mixed to form the hard layer; the remaining raw materials are mixed to form the soft layer.

[0035] S2. First, take 1 / 5 to 1 / 3 of the total mass of the soft layer as a spherical matrix. Then, uniformly cover the surface of the spherical matrix with the first hard layer, and then uniformly cover the surface of the hard layer with the first soft layer. The first soft layer and the first hard layer have the same thickness, and the thickness of the first hard layer is 1 / 8 to 1 / 6 of the radius of the spherical matrix.

[0036] Repeat the coating process until the soft layer material is used up. Then, coat the remaining hard layer material onto the outermost soft layer surface to obtain the pre-shaped material.

[0037] S3. The pre-shaped material is sintered to obtain a lining material with a pearl-like layer.

[0038] Furthermore, in step S3, the sintering temperature is 1200–1300°C, and the time is 12–13 hours.

[0039] Note: If the sintering parameters are too small or too large, the strength of the lining material will be weakened.

[0040] Compared with existing rotary kiln lining materials, the advantages of this invention are:

[0041] (1) The modified industrial solid waste used in the lining material of this invention achieves particle surface activation and internal pore optimization through evaporation and steam stirring of industrial solid waste, providing a physical basis for subsequent acid treatment and fiber dispersion of industrial solid waste. The fibers obtained after acid treatment of solid phase A are dispersed in polyvinyl alcohol solution under high voltage electric field to form oriented fiber bundles. This fiber network can significantly improve the flexural strength and fracture toughness of the material. Solid phase B combines with modifier and sulfite pulp to form a slurry with a microporous structure, which combines with the fiber bundles to reduce the thermal conductivity of the material and improve the thermal insulation performance. The high-toughness fiber bundles are located inside to buffer thermal stress, and the high-density slurry is distributed on the outer layer to improve the wear resistance of modified industrial solid waste, realize performance zoning optimization, and thus improve the thermal shock resistance of the lining material.

[0042] (2) The lining material prepared by the present invention has a structure of alternating hard and soft layers. The hard layer is composed of plate-shaped corundum, α-Al2O3 micro powder and bauxite as the core, which gives the lining material excellent impact resistance. The soft layer contains soft clay and modified industrial solid waste, which improve the fracture toughness of the lining material through crack deflection and fiber bridging mechanism. The hard layer is similar to the "brick" (rigid phase) in mother-of-pearl, and the soft layer is similar to the "mud" (flexible phase). When the crack propagates, it deflects along the hard-soft interface. Energy is dissipated through layering, and the gradient matching of alternating hard and soft layers can reduce the interfacial thermal stress, thereby improving the high temperature resistance and thermal shock resistance of the lining material. Attached Figure Description

[0043] Figure 1 This is a comparison chart of the thermal conductivity results of Investigation 1 of this invention;

[0044] Figure 2 This is a comparison chart of the rate of decrease in high-temperature flexural strength in Investigation 1 of this invention;

[0045] Figure 3 This is a comparison chart of the thermal conductivity results of Investigation 2 of this invention;

[0046] Figure 4 This is a comparison chart of the rate of decrease in high-temperature flexural strength in Investigation 2 of this invention;

[0047] Figure 5 This is a comparison chart of the thermal conductivity results of Investigation 3 of this invention;

[0048] Figure 6 This is a comparison chart of the rate of decrease in high-temperature flexural strength in Investigation 3 of this invention. Detailed Implementation

[0049] To further illustrate the methods and effects of this invention, the technical solution of this invention will be clearly and completely described below in conjunction with experiments.

[0050] Example 1: A microporous high-purity aluminum-silicon resistant high-temperature rotary kiln lining material, comprising the following components by weight percentage:

[0051] α-Al₂O₃ micro powder: 3%;

[0052] Bauxite: 4%;

[0053] Silica micro powder: 7.5%;

[0054] Soft clay: 2%;

[0055] Modified industrial solid waste: 0.4%;

[0056] Water-reducing agent: 0.2%;

[0057] Binder: 0.2%;

[0058] Tabular corundum: Balance;

[0059] The particle size of the tabular corundum is 2-4 mm; the particle size of the α-Al2O3 micro powder is 2-3 μm, the particle size of the bauxite is 2-4 mm, and the particle size of the silica micro powder is 2-3 μm; the water-reducing agent is FS10; and the binder is aluminum dihydrogen phosphate.

[0060] The method for preparing the modified industrial solid waste is as follows:

[0061] Industrial solid waste (blast furnace slag) is crushed, ground, and sieved to obtain fragments with a particle size of 65-75 μm. The fragments are then evaporated to a moisture content of 5%, pressurized to 0.45 MPa, and hot steam at 108°C is introduced. The mixture is stirred at 100 r / min for 10 min in the hot steam environment. After stirring, the fragments are separated into solid phase A and solid phase B with a mass ratio of 1:4.

[0062] Solid phase A was treated with acid to obtain solid waste fibers. The acid treatment method was as follows: solid phase A was treated in an acid solution with a pH of 4.8 and a temperature of 50°C at a solid-liquid ratio of 1g:6.5ml for 3 hours. The acid solution was a sulfuric acid solution with a mass concentration of 15%. Then, the solid waste fibers were dispersed in a polyvinyl alcohol solution at a solid-liquid ratio of 1g:22ml. During the dispersion process, a high voltage electric field with an electric field strength of 55kV was applied for 15 minutes to obtain fiber bundles.

[0063] Solid phase B and modifier, calcium carbonate, were mixed at a mass ratio of 5:1 and reacted for 3.5 h. The reaction product was then mixed with sulfite pulp at a solid-liquid ratio of 1 g: 20 ml and heated at 110 °C for 35 min to obtain the pulp.

[0064] The slurry was evenly sprayed onto the surface of the fiber bundle and sintered at 1000℃ for 2 hours to obtain modified industrial solid waste.

[0065] Example 2: A method for preparing a microporous high-purity aluminum-silicon resistant high-temperature rotary kiln lining material as described in Example 1, comprising the following steps:

[0066] S1. The main materials are tabular corundum, α-Al2O3 micro powder, bauxite, silica micro powder, and water-reducing agent.

[0067] By weight percentage, 70% of the main material, 18% of the modified industrial solid waste, 25% of the soft clay, and 75% of the binder are mixed to form the hard layer; the remaining raw materials are mixed to form the soft layer.

[0068] S2. First, take 1 / 4 of the total mass of the soft layer as a spherical matrix. Then, uniformly cover the surface of the spherical matrix with the first hard layer, and then uniformly cover the surface of the hard layer with the first soft layer. The first soft layer and the first hard layer have the same thickness, and the thickness of the first hard layer is 1 / 7 of the radius of the spherical matrix.

[0069] Repeat the coating process until the soft layer material is used up. Then, coat the remaining hard layer material onto the outermost soft layer surface to obtain the pre-shaped material.

[0070] S3. The pre-shaped material is sintered at a temperature of 1250°C for 12.5 hours to obtain a pearl-like lining material.

[0071] Example 3: This example differs from Example 1 in that it includes the following components by weight percentage:

[0072] α-Al₂O₃ micro powder: 1%;

[0073] Bauxite: 2%;

[0074] Silica micro powder: 5%;

[0075] Soft clay: 1%;

[0076] Modified industrial solid waste: 0.5%;

[0077] Water-reducing agent: 0.1%; the water-reducing agent is sodium tripolyphosphate;

[0078] Binder: 0.1%;

[0079] Tabular corundum: Balance.

[0080] Example 4: This example differs from Example 1 in that it includes the following components by weight percentage:

[0081] α-Al₂O₃ micro powder: 5%;

[0082] Bauxite: 6%;

[0083] Silica micro powder: 10%;

[0084] Soft clay: 3%;

[0085] Modified industrial solid waste: 0.3%;

[0086] Water-reducing agent: 0.3%; the water-reducing agent is sodium hexametaphosphate;

[0087] Binder: 0.3%;

[0088] Tabular corundum: Balance.

[0089] Example 5: The difference between this example and Example 1 is that the particle size of the tabular corundum is 0-2 mm; the particle size of the α-Al2O3 micro powder is 1-2 μm; the particle size of the bauxite is 0-2 mm; and the particle size of the silica micro powder is 1-2 μm.

[0090] Example 6: The difference between this example and Example 1 is that the particle size of the tabular corundum is 4-5 mm; the particle size of the α-Al2O3 micro powder is 3-5 μm; the particle size of the bauxite is 4-5 mm; and the particle size of the silica micro powder is 3-5 μm.

[0091] Example 7: The difference between this example and Example 1 is that the coal gangue fragments with a particle size of 75-80μm are evaporated to a moisture content of 55%, pressurized to 0.4Mpa, and hot steam at 105℃ is introduced. The mixture is stirred at 90r / min for 5min in the hot steam environment.

[0092] Example 8: The difference between this example and Example 1 is that the fly ash fragments with a particle size of 60-65 μm are evaporated to a moisture content of 35%, pressurized to 0.5 MPa, and hot steam at 110°C is introduced. The mixture is stirred at 110 r / min for 15 min in the hot steam environment.

[0093] Example 9: The difference between this example and Example 1 is that solid phase A is treated in an acidic solution with a pH of 5 and a temperature of 40°C at a solid-liquid ratio of 1g:8ml for 2h. The acidic solution is a sulfuric acid solution with a mass concentration of 10%.

[0094] Example 10: This example differs from Example 1 in that solid phase A is treated in an acidic solution with a pH of 4.5 and a temperature of 60°C at a solid-liquid ratio of 1g:5ml for 4 hours. The acidic solution is a sulfuric acid solution with a mass concentration of 20%.

[0095] Example 11: The difference between this example and Example 1 is that solid waste fibers are dispersed in a polyvinyl alcohol solution at a solid-liquid ratio of 1g:30ml, and a high-voltage electric field with an electric field strength of 50kV is applied during the dispersion process for 10min.

[0096] Example 12: The difference between this example and Example 1 is that the solid waste fiber is dispersed in a polyvinyl alcohol solution at a solid-liquid ratio of 1g:15ml, and a high voltage electric field with an electric field strength of 60kV is applied during the dispersion process for 20min.

[0097] Example 13: The difference between this example and Example 1 is that solid phase B and modifier (calcium carbonate) are mixed at a mass ratio of 4:1 and reacted for 2.5 hours. The reaction product is mixed with sulfite pulp at a solid-liquid ratio of 1g:25ml and heated at 105°C for 30 minutes.

[0098] Example 14: The difference between this example and Example 1 is that solid phase B and modifier (sodium silicate) are mixed at a mass ratio of 7:1 and reacted for 4.5 hours. The reaction product is mixed with sulfite pulp at a solid-liquid ratio of 1g:15ml and heated at 115°C for 40 minutes.

[0099] Example 15: The difference between this example and Example 1 is that the scrap is divided into solid phase A and solid phase B with a mass ratio of 1:3. The slurry is sprayed evenly on the surface of the fiber bundle and sintered at 900°C for 1.5 hours.

[0100] Example 16: The difference between this example and Example 1 is that the scrap is divided into solid phase A and solid phase B with a mass ratio of 1:5. The slurry is sprayed evenly on the surface of the fiber bundle and sintered at 1050°C for 2.5 hours.

[0101] Example 17: This example differs from Example 2 in that, by weight percentage, 65% of the main material, 20% of the modified industrial solid waste, 30% of the soft clay, and 70% of the binder are mixed to form the hard layer.

[0102] Example 18: This example differs from Example 2 in that, by weight percentage, 75% of the main material, 15% of the modified industrial solid waste, 20% of the soft clay, and 80% of the binder are mixed to form the hard layer.

[0103] Example 19: The difference between this example and Example 2 is that 1 / 5 of the total mass of the soft layer is used as the spherical matrix, and the thickness of the first hard layer is 1 / 6 of the radius of the spherical matrix.

[0104] Example 20: The difference between this example and Example 2 is that 1 / 3 of the total mass of the soft layer is used as the spherical matrix, and the thickness of the first hard layer is 1 / 8 of the radius of the spherical matrix.

[0105] Example 21: The difference between this example and Example 2 is that in step S3, the sintering temperature is 1200℃ and the time is 12h.

[0106] Example 22: This example differs from Example 2 in that, in step S3, the sintering temperature is 1300℃ and the time is 13h.

[0107] Experimental Example: The description of this experimental example is based on the scheme described in Example 2, and aims to illustrate the practical application effect of the present invention.

[0108] To illustrate the high-temperature resistance and thermal shock resistance of the lining material obtained in this invention, the lining material was measured using the laser flash method. The sample was tested at a specified temperature, heat flow was recorded, and thermal conductivity was calculated. The lining material underwent a thermal shock stability test (1100℃ water quenching method) according to YB / T376.1-1995 standard. The high-temperature flexural strength after the test was obtained, and then compared with the high-temperature flexural strength before the thermal shock stability test to obtain the high-temperature flexural strength reduction rate, which was used as the test result for thermal shock resistance. The test results are as follows:

[0109] 1. Investigate the influence of the composition of the lining material on the thermal conductivity and thermal shock resistance of the lining material.

[0110] The difference between Comparative Example 1 and Example 1 is that no modified industrial solid waste is added to the lining material;

[0111] Depend on Figure 1 and Figure 2 The results show that, compared with Examples 1, 3-7, which lack modified industrial solid waste and lack the crack bridging of solid waste fibers and the pore buffering mechanism of modified industrial solid waste, the performance of the lining material is reduced.

[0112] Comparing Examples 1 and 3-6, it can be seen that if the proportion of modified industrial solid waste is too small or too large, or if the particle size of the raw material is too small or too large, the thermal conductivity of the lining material and the rate of decrease in high-temperature compressive strength will increase. Therefore, in a comprehensive comparison, the parameter effect of Example 1 is relatively better.

[0113] 2. To investigate the effect of the preparation of modified industrial solid waste on the thermal conductivity and thermal shock resistance of the lining material.

[0114] The difference between Comparative Example 2 and Example 1 is that the solid waste fibers are not dispersed or treated with a high-voltage electric field;

[0115] The difference between Comparative Example 3 and Example 1 is that the slurry was mixed with the fiber bundle instead of being sprayed;

[0116] Depend on Figure 3 and Figure 4 The results show that Comparative Example 2 lacks the induction of directional arrangement of solid waste fibers, which reduces the inhibition effect on high-temperature creep of the lining material compared with Examples 1 and 7-16; In the mixing method of Comparative Example 3, the modified material randomly fills the fiber gaps, making it difficult to form the heat conduction path that is synergistically optimized by the directional arrangement of fibers and the modified layer in the coating method, resulting in unstable thermal insulation of the lining material.

[0117] Comparing Examples 1 and 7-16, it can be seen that excessively small or large parameters for the shredding process, acid treatment, dispersion electric field, modification, and sintering all increase the thermal conductivity and the rate of decrease in high-temperature compressive strength of the lining material. In Example 16, the sintering parameters are higher, resulting in a slight improvement in the performance of the lining material. However, the improvement is less than the improvement achieved by the sintering parameters. Therefore, from an economic perspective, the parameters in Example 1 are relatively more effective.

[0118] 3. Investigate the influence of the preparation of the lining material on the thermal conductivity and thermal shock resistance of the lining material.

[0119] The difference between Comparative Example 4 and Example 2 is that all raw materials were mixed evenly.

[0120] The difference between Comparative Example 5 and Example 2 is that the coating is performed in the order of hard layer-soft layer, with the outermost layer being a soft layer;

[0121] Depend on Figure 5 and Figure 6 The results show that the homogeneous material formed by uniform mixing in Comparative Example 4 lacks the soft-hard alternating structure of the imitation nacre layer, and cannot absorb impact energy through the plastic deformation of the soft layer or deflect crack paths through the hard layer; in the structure of Comparative Example 5, the surface of the soft layer heats up rapidly at high temperatures, while the heat dissipation of the inner hard layer is delayed, resulting in the outer soft layer bearing greater thermal gradient stress, which significantly reduces the high temperature resistance of the inner lining material compared to Examples 2 and 17-22.

[0122] Comparing Examples 2 and 17-22, it can be seen that too small or too large a proportion of industrial solid waste in the hard layer, too small or too large a thickness difference between the soft and hard layers, and too small sintering parameters will all increase the thermal conductivity and the rate of decrease in high-temperature compressive strength of the lining material. In Example 22, the sintering parameters are higher, resulting in a slight improvement in the performance of the lining material. However, the improvement in performance is lower than the improvement in sintering parameters. Therefore, from an economic point of view, the parameter effect of Example 2 is relatively better.

Claims

1. A microporous high-purity aluminum-silicon based high-temperature resistant rotary kiln lining material, characterized in that, By weight percentage, it includes the following components: α-Al₂O₃ micro powder: 1–5%; Bauxite: 2-6%; Silica micro powder: 5-10%; Soft clay: 1-3%; Modified industrial solid waste: 0.3-0.5%; Water-reducing agent: 0.1-0.3%; Binder: 0.1–0.3%; Tabular corundum: Balance.

2. The microporous high-purity aluminum-silicon based high-temperature resistant rotary kiln lining material as described in claim 1, characterized in that, The particle size of the tabular corundum is 0-5 mm; the particle size of the α-Al2O3 micro powder is 1-5 μm, the particle size of the bauxite is 0-5 mm, and the particle size of the silica micro powder is 1-5 μm.

3. The microporous high-purity aluminum-silicon based high-temperature resistant rotary kiln lining material as described in claim 1, characterized in that, The method for preparing the modified industrial solid waste is as follows: Industrial solid waste is crushed, ground, and sieved to obtain fragments with a particle size of 60-80 μm. The fragments are then evaporated until the moisture content is ≤10%, pressurized to 0.4-0.5 MPa, and hot steam at 105-110°C is introduced. The mixture is stirred at 90-110 r / min for 5-15 min in the hot steam environment. After stirring, the fragments are separated into solid phase A and solid phase B with a mass ratio of 1:3-5. Solid phase A is treated with acid to obtain solid waste fiber. The solid waste fiber is then dispersed in polyvinyl alcohol solution at a solid-liquid ratio of 1g:15-30ml. During the dispersion process, a high voltage electric field with an electric field strength of 50-60kV is applied for 10-20min to obtain fiber bundle. Solid phase B and the modifier are mixed at a mass ratio of 4 to 7:1 and reacted for 2.5 to 4.5 hours. The reaction product is then mixed with sulfite pulp at a solid-liquid ratio of 1 g to 15 to 25 ml and heated at 105 to 115 °C for 30 to 40 minutes to obtain the pulp. The slurry is evenly sprayed onto the surface of the fiber bundle and sintered at 900–1050℃ for 1.5–2.5 h to obtain modified industrial solid waste.

4. The microporous high-purity aluminum-silicon based high-temperature resistant rotary kiln lining material as described in claim 3, characterized in that, The modifier is calcium carbonate or silicate.

5. The microporous high-purity aluminum-silicon based high-temperature resistant rotary kiln lining material as described in claim 1, characterized in that, The industrial solid waste is selected from any one of coal gangue, fly ash, and blast furnace slag.

6. The microporous high-purity aluminum-silicon based high-temperature resistant rotary kiln lining material as described in claim 3, characterized in that, The acid treatment method is as follows: solid phase A is treated in an acid solution with a pH of 4.5-5 and a temperature of 40-60℃ at a solid-liquid ratio of 1g:5-8ml for 2-4 hours. The acid solution is a sulfuric acid solution with a mass concentration of 10-20%.

7. The microporous high-purity aluminum-silicon based high-temperature resistant rotary kiln lining material as described in claim 1, characterized in that, The water-reducing agent is any one of FS10, sodium tripolyphosphate, and sodium hexametaphosphate.

8. The microporous high-purity aluminum-silicon based high-temperature resistant rotary kiln lining material as described in claim 1, characterized in that, The binder is aluminum dihydrogen phosphate.

9. A method for preparing a microporous high-purity aluminum-silicon resistant high-temperature rotary kiln lining material as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. The main materials are tabular corundum, α-Al2O3 micro powder, bauxite, silica micro powder, and water-reducing agent. By weight percentage, 65-75% of the main material, 15-20% of the modified industrial solid waste, 20-30% of the soft clay, and 70-80% of the binder are mixed to form the hard layer; the remaining raw materials are mixed to form the soft layer. S2. First, take 1 / 5 to 1 / 3 of the total mass of the soft layer as a spherical matrix. Then, uniformly cover the surface of the spherical matrix with the first hard layer, and then uniformly cover the surface of the hard layer with the first soft layer. The first soft layer and the first hard layer have the same thickness, and the thickness of the first hard layer is 1 / 8 to 1 / 6 of the radius of the spherical matrix. Repeat the coating process until the soft layer material is used up. Then, coat the remaining hard layer material onto the outermost soft layer surface to obtain the pre-shaped material. S3. The pre-shaped material is sintered to obtain a lining material with a pearl-like layer.

10. The microporous high-purity aluminum-silicon based high-temperature resistant rotary kiln lining material and its preparation method as described in claim 9, characterized in that, In step S3, the sintering temperature is 1200-1300℃ and the time is 12-13h.

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