Mullite-glass composite material for chlorination furnace and preparation method thereof

Abstract

The application belongs to the technical field of refractory materials, and particularly relates to a mullite-glass composite material for a chlorination furnace, which is prepared from the following components in parts by mass: 10-30 parts of mullite particles with a particle size of 3-1 mm, 10-30 parts of andalusite particles with a particle size of 3-1 mm, 5-10 parts of mullite particles with a particle size of 1-0 mm, 5-10 parts of andalusite particles with a particle size of 1-0 mm, 5-10 parts of sillimanite particles with a particle size of 1-0 mm, 10-20 parts of 200-mesh mullite powder, 10-20 parts of 200-mesh andalusite powder, 5-10 parts of 325-mesh andalusite powder, 1-3 parts of zirconium oxide powder, 1-3 parts of talc powder, 1-3 parts of silicon powder, 3-8 parts of binding clay, and 4±2 parts of a binding agent solution.

Description

Technical Field

[0001] This invention belongs to the field of refractory materials technology, specifically relating to a mullite-glass composite material for chlorination furnaces and its preparation method. Background Technology

[0002] The fluidized bed chlorination process is a key technology in the production of titanium metal via chlorination and a crucial link in the titanium industry chain for the preparation of TiCl4. It uses fine-grained synthetic rutile (or high-titanium slag) and petroleum coke as raw materials, and is a fluidized bed chlorination process carried out at high temperatures (approximately 950-1000℃). Specifically, the mixture is continuously added into the furnace, where it forms a vortex fluidized bed with chlorine gas introduced from the bottom in an inverted frustum-shaped reaction section. The material fully contacts the chlorine gas and undergoes a chlorination reaction (TiO2 + 2C + 2Cl2 → TiCl4 + 2CO) to produce gaseous titanium tetrachloride.

[0003] Currently, the commonly used furnace lining materials for chlorination furnaces in China are mainly high-alumina or mullite refractories. Although they have a certain high-temperature strength, they have the following prominent problems: (1) Al2O3 in the main component is easily chlorinated. Under high-temperature chlorination environment, the Al2O3 component in the furnace lining material is easily reacted with chlorine to generate AlCl3 volatiles, which gradually erodes the furnace lining. In order to reduce the erosion rate, it is necessary to control the alumina content of the material and increase the silicon oxide content to improve the stability of the material.

[0004] (2) The reducing atmosphere leads to structural damage. A large amount of CO gas is generated during the reaction, resulting in a high reducing atmosphere in the furnace. Under the reducing atmosphere, Fe2O3 impurities in the material are easily chlorinated to form FeCl3, causing damage to the material structure.

[0005] (3) High porosity leads to accelerated erosion. The apparent porosity of refractory materials prepared by traditional processes is often between 12% and 26%. Since chlorine and CO are both gaseous molecules, they can quickly diffuse into the interior of the material through open pores and react with the matrix, causing structural damage from the surface inward. High porosity not only weakens the strength of the material, but also makes chloride intrusion more rapid, resulting in a significant reduction in service life.

[0006] (4) Insufficient high-temperature structural stability. The exothermic characteristics of the boiling chlorination reaction can easily cause local overheating (up to 1500℃ or more). When the material load softening temperature is too low, the furnace lining is prone to deformation or collapse under thermal stress, resulting in unstable reaction zone dimensions and deterioration of fluidization state.

[0007] Patent CN116253574A discloses a method for preparing a refractory material for a chlorination furnace with low aluminum and ultra-low porosity. The material has an Al2O3 content between 32% and 43%. At high temperatures, the liquid phase in the low aluminum and high potassium raw materials is used to promote sintering, reducing the porosity of the material to below 8%. Although this helps to inhibit the diffusion and erosion of harmful gases into the material, the increase in the amount of liquid phase inevitably greatly reduces its high-temperature resistance. Under the exothermic reaction and overheating conditions in the fluidized bed chlorination furnace, it exhibits insufficient high-temperature resistance.

[0008] Patent CN103086724B, "Preparation Method of Mullite Ceramic Glazed Composite Bricks for Chlorination Furnaces," discloses a method for preparing mullite ceramic glazed composite refractory materials for the lining of high-temperature chlorination furnaces used in the production of titanium dioxide via the chlorination process. This method involves manually brushing or spraying a 2-5mm layer of low-temperature glazing onto the brick surface using a glaze mixture. During the subsequent furnace drying process, a 1-3mm thick high-temperature glazed layer resistant to chlorine gas, titanium tetrachloride, and strong acid corrosion is formed on the brick surface, preventing leakage and corrosion from high-temperature chlorine gas, titanium tetrachloride, strong acids, and chlorinated impurities. While this method can initially prevent the erosion of harmful gases, the high-temperature glaze is inevitably eroded and washed away by materials after a period of use. In actual use, the performance of the internal materials becomes the decisive factor.

[0009] Patent CN106518114A, "Manufacturing Process of Clay Refractory Materials with Ultra-Low Porosity and Low Expansion Rate," discloses a process that utilizes the reduction of Fe2O3 in raw materials to FeO during firing in a CO-rich reducing atmosphere to form a low-melting-point glass phase and promote sintering. This process can produce clay refractory materials with a porosity as low as 5%. However, this process requires the use of CO to control the reducing atmosphere, which has high safety requirements. In addition, the raw materials used have a high Fe2O3 content. Under the action of CO and chlorine, this material will form FeCl3 and volatilize, causing damage to the material structure and pulverization.

[0010] In summary, existing technologies still struggle to simultaneously achieve low porosity, high load softening temperature, high mechanical strength, and high erosion resistance. Overcoming this deficiency has become an urgent need to break through the current industrial bottleneck.

[0011] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0012] The present invention aims to overcome the shortcomings of the prior art and provides a mullite-glass composite material for chlorination furnaces. The refractory material prepared by this method has a porosity of less than 5%, a strength of more than 120 MPa, and a load softening temperature of more than 1550℃. It is expected to solve the problems of high porosity, insufficient resistance to chlorine gas corrosion, and short service life of existing refractory materials for chlorination furnaces.

[0013] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, embodiments of this disclosure provide a mullite-glass composite material for chlorination furnaces, the raw material composition comprising, by mass parts, the following components: 10-30 parts of mullite particles with a particle size of 3-1 mm, 10-30 parts of andalusite particles with a particle size of 3-1 mm, 5-10 parts of mullite particles with a particle size of 1-0 mm, 5-10 parts of andalusite particles with a particle size of 1-0 mm, 5-10 parts of sillimanite particles with a particle size of 1-0 mm, 10-20 parts of 200-mesh mullite fine powder, 10-20 parts of 200-mesh andalusite fine powder, 5-10 parts of 325-mesh andalusite fine powder, 1-3 parts of zirconium oxide powder, 1-3 parts of talc powder, 1-3 parts of silica powder, 3-8 parts of binding clay, and 4±2 parts of binder solution.

[0014] In one optional embodiment, the mullite particles and mullite powder are dense low-alumina-high-silica glass phase composite materials, wherein the content of Al2O3 is 40-50%, the content of Fe2O3 is ≤0.6%, the main crystalline phase is mullite, the remainder is a glass phase, and the content of SiO2 in the glass phase is ≥70%.

[0015] In one optional embodiment, the content of Al2O3 in the andalusite particles and andalusite powder is ≥59%, and the content of Fe2O3 is ≤0.6%.

[0016] In one optional embodiment, the sillimanite particles contain ≥55% Al2O3 and ≤0.6% Fe2O3.

[0017] In one optional embodiment, the zirconium oxide powder has a particle size of 200-800 nm, wherein the ZrO2 content is ≥99%.

[0018] In one optional embodiment, the silicon micropowder contains ≥95% SiO2.

[0019] In one optional embodiment, the binding clay includes any one of Guangxi white clay, Suzhou clay, Jiaozuo clay, and ball clay; the particle size of the binding clay is 200 mesh, wherein the Al2O3 content is 30-39%, and the Fe2O3 content is ≤0.4%.

[0020] In one alternative embodiment, the binder solution comprises any one of silica sol, alumina sol, and pulp waste liquid.

[0021] Secondly, this disclosure also provides a method for preparing the mullite-glass composite material for chlorination furnaces as described above, comprising the following steps: S1, mixing 200-mesh mullite powder, 200-mesh andalusite powder, 325-mesh andalusite powder, silica powder, and binding clay in a certain proportion to obtain a first mixture, which is then prepared for use; placing zirconia powder and talc powder in a ball mill for mixing, using corundum balls as the mixing medium, with a ball-to-material ratio of 2:1, a rotation speed of 60 r / min, and mixing for 3 h to obtain a second mixture, which is then prepared for use; mixing mullite particles and andalusite... Stone particles and sillimanite particles are added to a mixer and mixed for 1 minute. Then, a second mixture is added and mixed for 2 minutes. A binder solution is added and mixed until the particle surface is wetted and uniformly adhered by the second mixture. Then, the first mixture is added and mixed thoroughly to obtain mud. S2, the mud is pressed under a high pressure of not less than 150 MPa to obtain a brick blank. S3, the brick blank is thoroughly dried in an environment of not less than 110°C. Then, it is heated to 1500-1600°C in an oxidizing atmosphere and fired. After heat preservation and shaping, it is cooled to room temperature to obtain a mullite-glass composite material for chlorination furnaces.

[0022] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: First, this invention employs a multi-level particle size gradient system composed of 3-1 mm and 1-0 mm granules and 200-325 mesh and 200-800 nm powders. Through graded mixing of raw materials of different particle sizes, coarse particles form a stable skeletal structure, while fine and micro powders fully fill the gaps between particles. Simultaneously, a premixing method using talc and nanoparticles is used to prevent nanoparticle agglomeration and promote uniform dispersion. Combined with high-pressure molding, the densest packing of the particle system is achieved, significantly reducing the initial porosity of the material. Second, the introduced andalusite undergoes a mullite reaction at high temperature, accompanied by a certain volume expansion effect, which further fills the residual pores inside the material, increasing its density. Furthermore, the silica-rich glassy phase formed during mullite formation, together with the added talc, forms a silica-rich glassy phase system within the material. This glassy phase not only promotes the bonding between particles and matrix fine powders during sintering but also encapsulates the aluminum-rich mullite phase and matrix fine powders. The prepared material has low porosity, and the formed silica-rich glass phase encapsulates the particulate material and matrix fine powder, creating an isolation barrier between the aluminum-rich mullite phase and the external corrosive medium. This reduces the possibility of Al2O3 reacting with chlorine to form AlCl3, thus lowering the risk of material damage by chlorination. Therefore, the obtained material exhibits extremely low porosity and excellent chemical stability, demonstrating good resistance to chlorine corrosion.

[0023] In terms of material preparation, this invention incorporates talc and nano-zirconia during the mixing stages of 3-1 mm and 1-0 mm particle materials, along with a binder, to facilitate adhesion of talc and nano-zirconia to the particle surface and pores. Under high-temperature conditions, the silica-rich glass phase formed by talc adhering to the particle surface and matrix components more readily encapsulates the particles, promoting sintering between the particles and the fine matrix powder, thus improving material strength. Furthermore, nano-zirconia preferentially distributes within the silica-rich glass phase, increasing its viscosity and, to some extent, raising the material's load softening temperature. Finally, the added sillimanite undergoes a mullitization reaction at high temperatures, accompanied by a certain volume expansion effect, which can partially compensate for material shrinkage during high-temperature firing and use, improving high-temperature dimensional stability and load softening temperature. Ultimately, this results in refractory materials with high compressive strength and high load softening temperature.

[0024] The mullite-glass composite material prepared in this invention was tested and found to have: an apparent porosity of 2-5%; and a bulk density of 2.30-2.45 g / cm³. 3 The compressive strength at room temperature is 120-165 MPa; the softening temperature under load is above 1550℃.

[0025] Therefore, the preparation process of this invention is simple, and the mullite-glass composite material prepared by this method has low porosity, high strength, high load-bearing capacity, and good resistance to chlorine and CO corrosion.

[0026] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 Microstructure diagram of a mullite-glass composite material for a fluidized bed chlorination furnace provided in this embodiment of the present disclosure.

[0030] The image clearly shows that the acicular mullite, the mullite transformed from andalusite, and the mullite formed by binding clay in the matrix are immersed in a silica-rich glass phase, and the aluminum-rich mullite is fully encapsulated by the silica-rich glass phase. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 within the scope of protection of the present invention.

[0032] The present invention will be further described below with reference to specific embodiments, but this is not intended to limit the scope of protection thereof.

[0033] Example 1, the formula is as follows: 20 parts of mullite particles with a particle size of 3-1mm, 20 parts of andalusite particles with a particle size of 3-1mm, 5 parts of mullite particles with a particle size of 1-0mm, 5 parts of andalusite particles with a particle size of 1-0mm, 10 parts of sillimanite particles with a particle size of 1-0mm, 10 parts of 200-mesh mullite fine powder, 15 parts of 200-mesh andalusite fine powder, 5 parts of 325-mesh andalusite fine powder, 2 parts of zirconium oxide powder, 1 part of talc powder, 2 parts of silica powder, 5 parts of Guangxi white clay, and 4 parts of silica sol binder.

[0034] Preparation steps: S1, Mix 200-mesh mullite powder, 200-mesh andalusite powder, 325-mesh andalusite powder, silica powder, and Guangxi white clay in a certain proportion to obtain the first mixture, and set aside; Place zirconia powder and talc powder in a ball mill and mix them with corundum balls as the mixing medium, with a ball-to-material ratio of 2:1, a rotation speed of 60 r / min, and mix for 3 hours to obtain the second mixture, and set aside; Add mullite particles, andalusite particles, and sillimanite particles to a mixer and mix for 1 minute. In step S1, add the second mixture and mix for 2 minutes. Add the binder solution and mix until the particle surface is wetted and uniformly adhered by the second mixture. Then add the first mixture and mix thoroughly to obtain mud. In step S2, press the mud under a high pressure of not less than 150 MPa to obtain brick blanks. In step S3, dry the brick blanks at not less than 110℃ for 24 hours, then heat them to 1600℃ in an oxidizing atmosphere and keep them at that temperature for 6 hours. After keeping them at that temperature, cool them to room temperature to obtain mullite-glass composite material for chlorination furnaces.

[0035] The performance indicators of the mullite-glass composite material are as follows: Al2O3 content: 48.54%; apparent porosity: 2.8%; room temperature compressive strength: 150 MPa; Fe2O3 content: 0.74%; load softening temperature (0.6 MPa): 1580℃.

[0036] Example 2, the formula is as follows: 30 parts of mullite particles with a particle size of 3-1mm, 10 parts of andalusite particles with a particle size of 3-1mm, 10 parts of mullite particles with a particle size of 1-0mm, 5 parts of andalusite particles with a particle size of 1-0mm, 5 parts of sillimanite particles with a particle size of 1-0mm, 15 parts of 200-mesh mullite fine powder, 10 parts of 200-mesh andalusite fine powder, 5 parts of 325-mesh andalusite fine powder, 2 parts of zirconium oxide powder, 1 part of talc powder, 2 parts of silica powder, 5 parts of Suzhou clay, and 4 parts of binder pulp waste liquor.

[0037] Preparation steps: S1, Mix 200-mesh mullite powder, 200-mesh andalusite powder, 325-mesh andalusite powder, silica powder, and Suzhou clay in a certain proportion to obtain the first mixture, and set aside; Place zirconia powder and talc powder in a ball mill and mix them with corundum balls as the mixing medium, with a ball-to-material ratio of 2:1, a rotation speed of 60 r / min, and mix for 3 hours to obtain the second mixture, and set aside; Add mullite particles, andalusite particles, and sillimanite particles to a mixer and mix for 1 minute. In step S1, add the second mixture and mix for 2 minutes. Add the binder solution and mix until the particle surface is wetted and uniformly adhered by the second mixture. Then add the first mixture and mix thoroughly to obtain mud. In step S2, press the mud under a high pressure of not less than 150 MPa to obtain brick blanks. In step S3, dry the brick blanks at not less than 110℃ for 24 hours, then heat them to 1550℃ in an oxidizing atmosphere and keep them at that temperature for 6 hours. After keeping them at that temperature, cool them to room temperature to obtain mullite-glass composite material for chlorination furnaces.

[0038] The performance indicators of the mullite-glass composite material are as follows: Al2O3 content: 45.36%; apparent porosity: 3.8%; room temperature compressive strength: 143 MPa; Fe2O3 content: 0.78%; load softening temperature (0.6 MPa): 1550℃.

[0039] Example 3, the formula is as follows: 10 parts of mullite particles with a particle size of 3-1mm, 30 parts of andalusite particles with a particle size of 3-1mm, 5 parts of mullite particles with a particle size of 1-0mm, 10 parts of andalusite particles with a particle size of 1-0mm, 5 parts of sillimanite particles with a particle size of 1-0mm, 10 parts of 200-mesh mullite fine powder, 15 parts of 200-mesh andalusite fine powder, 5 parts of 325-mesh andalusite fine powder, 2 parts of zirconium oxide powder, 1 part of talc powder, 2 parts of silica powder, 5 parts of Suzhou clay, and 4 parts of binder pulp waste liquor.

[0040] Preparation steps: S1, Mix 200-mesh mullite powder, 200-mesh andalusite powder, 325-mesh andalusite powder, silica powder, and Suzhou clay in a certain proportion to obtain the first mixture, and set aside; Place zirconia powder and talc powder in a ball mill and mix them with corundum balls as the mixing medium, with a ball-to-material ratio of 2:1, a rotation speed of 60 r / min, and mix for 3 hours to obtain the second mixture, and set aside; Add mullite particles, andalusite particles, and sillimanite particles to a mixer and mix for 1 minute. In step S1, add the second mixture and mix for 2 minutes. Add the binder solution and mix until the particle surface is wetted and uniformly adhered by the second mixture. Then add the first mixture and mix thoroughly to obtain mud. In step S2, press the mud under a high pressure of not less than 150 MPa to obtain brick blanks. In step S3, dry the brick blanks at not less than 110℃ for 24 hours, then heat them to 1580℃ in an oxidizing atmosphere and keep them at that temperature for 8 hours. After keeping them at that temperature, cool them to room temperature to obtain mullite-glass composite material for chlorination furnaces.

[0041] The performance indicators of the mullite-glass composite material are as follows: Al2O3 content: 50.00%; apparent porosity: 1.8%; room temperature compressive strength: 165 MPa; Fe2O3 content: 0.53%; load softening temperature (0.6 MPa): 1620℃.

[0042] Example 4, the formula is as follows: 20 parts of mullite particles with a particle size of 3-1mm, 20 parts of andalusite particles with a particle size of 3-1mm, 5 parts of mullite particles with a particle size of 1-0mm, 5 parts of andalusite particles with a particle size of 1-0mm, 10 parts of sillimanite particles with a particle size of 1-0mm, 10 parts of 200-mesh mullite fine powder, 13 parts of 200-mesh andalusite fine powder, 5 parts of 325-mesh andalusite fine powder, 3 parts of zirconium oxide powder, 1 part of talc powder, 3 parts of silica powder, 5 parts of coking soil, and 4 parts of binder pulp waste liquor.

[0043] Preparation steps: S1, Mix 200-mesh mullite powder, 200-mesh andalusite powder, 325-mesh andalusite powder, silica powder, and coke clay in a certain proportion to obtain the first mixture, and set aside; Place zirconia powder and talc powder in a ball mill and mix them with corundum balls as the mixing medium, with a ball-to-material ratio of 2:1, a rotation speed of 60 r / min, and mix for 3 hours to obtain the second mixture, and set aside; Add mullite particles, andalusite particles, and sillimanite particles to a mixer and mix for 1 minute. n, add the second mixture, mix for 2 minutes, add the binder solution and mix until the particle surface is wetted and uniformly adhered by the second mixture, then add the first mixture and mix thoroughly to obtain mud; S2, press the mud under a high pressure of not less than 150 MPa to obtain brick blanks; S3, dry the brick blanks at not less than 110℃ for 24 hours, then heat them to 1560℃ in an oxidizing atmosphere and keep them at that temperature for 10 hours, then cool them to room temperature to obtain mullite-glass composite material for chlorination furnaces.

[0044] The performance indicators of the mullite-glass composite material are as follows: Al2O3 content: 47.24%; apparent porosity: 4.2%; room temperature compressive strength: 138 MPa; Fe2O3 content: 0.58%; load softening temperature (0.6 MPa): 1556℃.

[0045] Example 5, the formula is as follows: 30 parts of mullite particles with a particle size of 3-1mm, 10 parts of andalusite particles with a particle size of 3-1mm, 5 parts of mullite particles with a particle size of 1-0mm, 5 parts of andalusite particles with a particle size of 1-0mm, 10 parts of sillimanite particles with a particle size of 1-0mm, 13 parts of 200-mesh mullite fine powder, 10 parts of 200-mesh andalusite fine powder, 5 parts of 325-mesh andalusite fine powder, 1 part of zirconium oxide powder, 3 parts of talc powder, 1 part of silica powder, 7 parts of ball clay, and 4 parts of binder pulp waste liquor.

[0046] Preparation steps: S1, Mix 200-mesh mullite powder, 200-mesh andalusite powder, 325-mesh andalusite powder, silica powder, and ball clay in a certain proportion to obtain the first mixture, and set aside; Place zirconia powder and talc powder in a ball mill and mix them with corundum balls as the mixing medium, with a ball-to-material ratio of 2:1, a rotation speed of 60 r / min, and mix for 3 h to obtain the second mixture, and set aside; Add mullite particles, andalusite particles, and sillimanite particles to a mixer and mix for 1 min. n, add the second mixture, mix for 2 minutes, add the binder solution and mix until the particle surface is wetted and uniformly adhered by the second mixture, then add the first mixture and mix thoroughly to obtain mud; S2, press the mud under a high pressure of not less than 150 MPa to obtain brick blanks; S3, dry the brick blanks at not less than 110℃ for 24 hours, then heat them to 1500℃ in an oxidizing atmosphere and keep them at that temperature for 10 hours, then cool them to room temperature to obtain mullite-glass composite material for chlorination furnaces.

[0047] The performance indicators of the mullite-glass composite material are as follows: Al2O3 content: 46.03%; apparent porosity: 2.2%; room temperature compressive strength: 148 MPa; Fe2O3 content: 0.63%; load softening temperature (0.6 MPa): 1552℃.

[0048] In summary, this mullite-glass composite material for chlorination furnace uses a full-gradient particle size distribution. Coarse particles form the skeleton structure, while fine and micro powders fully fill the skeleton. This eliminates micropores, reduces diffusion channels for chlorine and CO into the material, prevents erosion of the material matrix by the medium, and improves the material's strength and stability. Simultaneously, the combination of mullite and andalusite controls the alumina content to reduce its reaction with chlorine, thereby controlling the amount of AlCl3 volatiles. Combined with the excellent chemical stability of the high-silica glass phase in mullite, this reduces chlorination erosion while preventing the formation of low-melting-point phases, effectively increasing the load softening temperature, and ultimately achieving a balance of the three core performance characteristics of the refractory material.

[0049] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A mullite-glass composite material for a chlorination furnace, characterized in that, The raw material composition, by mass parts, includes the following components: 10-30 parts of mullite particles with a particle size of 3-1 mm, 10-30 parts of andalusite particles with a particle size of 3-1 mm, 5-10 parts of mullite particles with a particle size of 1-0 mm, 5-10 parts of andalusite particles with a particle size of 1-0 mm, 5-10 parts of sillimanite particles with a particle size of 1-0 mm, 10-20 parts of 200-mesh mullite fine powder, 10-20 parts of 200-mesh andalusite fine powder, 5-10 parts of 325-mesh andalusite fine powder, 1-3 parts of zirconium oxide powder, 1-3 parts of talc powder, 1-3 parts of silica powder, 3-8 parts of binding clay, and 4±2 parts of binder solution.

2. The mullite-glass composite material for chlorination furnaces as described in claim 1, characterized in that, The mullite particles and fine mullite powder are dense low-alumina-high-silica glass phase composite materials, wherein the content of Al2O3 is 40-50%, the content of Fe2O3 is ≤0.6%, the main crystalline phase is mullite, and the rest is glass phase, and the content of SiO2 in the glass phase is ≥70%.

3. The mullite-glass composite material for chlorination furnaces as described in claim 1, characterized in that, The content of Al2O3 in the andalusite particles and fine andalusite powder is ≥59%, and the content of Fe2O3 is ≤0.6%.

4. The mullite-glass composite material for chlorination furnaces as described in claim 1, characterized in that, The sillimanite particles contain ≥55% Al2O3 and ≤0.6% Fe2O3.

5. The mullite-glass composite material for chlorination furnaces as described in claim 1, characterized in that, The zirconium oxide powder has a particle size of 200-800 nm, and the ZrO2 content is ≥99%.

6. The mullite-glass composite material for chlorination furnaces as described in claim 1, characterized in that, The talc powder has a particle size of <0.044 mm, and contains 26-32% MgO and 50-62% SiO2.

7. The mullite-glass composite material for chlorination furnaces as described in claim 1, characterized in that, The silicon micropowder contains ≥95% SiO2.

8. The mullite-glass composite material for chlorination furnaces as described in claim 1, characterized in that, The bonding clay includes any one of Guangxi white clay, Suzhou clay, Jiaozuo clay and ball clay; The bonding clay has a particle size of 200 mesh, with an Al2O3 content of 30-39% and an Fe2O3 content of ≤0.4%.

9. The mullite-glass composite material for chlorination furnaces as described in claim 1, characterized in that, The binder solution includes any one of silica sol, alumina sol, and pulp waste liquid.

10. A method for preparing a mullite-glass composite material for a chlorination furnace as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Mix 200-mesh mullite powder, 200-mesh andalusite powder, 325-mesh andalusite powder, silica powder, and binding clay in a certain proportion to obtain the first mixture, and set it aside. Place zirconia powder and talc powder in a ball mill and mix them with corundum balls as the mixing medium, with a ball-to-material ratio of 2:1, a rotation speed of 60 r / min, and mix for 3 hours to obtain the second mixture, and set it aside. Add mullite particles, andalusite particles, and sillimanite particles to a mixer and mix for 1 minute. Add the second mixture and mix for 2 minutes. Add a binder solution and mix until the particle surface is wetted and uniformly adhered by the second mixture. Then add the first mixture and mix thoroughly to obtain the mud. S2, pressing the clay material under a high pressure of not less than 150MPa to obtain brick blanks; S3. The brick blank is thoroughly dried at an environment of not less than 110℃, and then fired at 1500-1600℃ in an oxidizing atmosphere. After heat preservation and shaping, it is cooled to room temperature to obtain a mullite-glass composite material for chlorination furnaces.

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