Molten aluminum purification equipment lining splicing structure and construction method

Abstract

The invention belongs to the technical field of molten aluminum purification equipment manufacturing, and particularly relates to a molten aluminum purification equipment lining splicing structure and a construction method.The molten aluminum purification equipment lining splicing structure comprises at least two prefabricated parts made of refractory materials, and the sides, making contact with molten aluminum, of the prefabricated parts are working faces; a step-shaped splicing seam is arranged between every two connected prefabricated parts, fiber paper is pasted on the step face of each splicing seam through water glass, and the splicing seams are filled with corundum self-flowing castable. According to the invention, no aluminum leakage at the gap of the lining can be avoided, the construction is simple and convenient, the overall performance of the lining is good, the lining is not easy to crack in a heated state, and the safe operation of equipment can be ensured.

Description

Technical Field

[0001] This invention belongs to the field of aluminum liquid purification equipment manufacturing technology, specifically relating to an aluminum liquid purification equipment lining assembly structure and construction method. Background Technology

[0002] In the aluminum industry, molten aluminum requires purification, which necessitates corresponding purification and filtration equipment. The lining of this equipment is composed of refractory materials. Due to the demands of aluminum processing, the required throughput of molten aluminum is increasing, leading to larger linings. The lining is primarily constructed from precast refractory components. These components are large and complex. During operation, the lining must withstand temperatures up to 800°C. The material is highly susceptible to thermal stress due to temperature variations, making it prone to cracking and potential leakage of molten aluminum. Therefore, these large precast components often employ an assembled structure, where the entire lining is composed of two or more precast components to reduce thermal stress concentration within the lining. However, gaps between adjacent precast components also easily lead to aluminum leakage. Furthermore, due to the volume change of the refractory castable at high temperatures, the precast component material cannot expand freely, resulting in cracking or damage. To address these issues, the applicant designed an assembly structure and construction method for the lining of an aluminum molten metal purification device. Summary of the Invention

[0003] To address the problems of existing technologies, the purpose of this invention is to provide an assembly structure and construction method for the inner lining of an aluminum liquid purification equipment, so as to prevent aluminum leakage at the gaps in the inner lining, and to simplify construction, improve the overall performance of the inner lining, prevent cracking under heat, and ensure safe operation of the equipment.

[0004] To achieve the above objectives, the present invention is implemented according to the following technical solution: An aluminum molten metal purification device lining assembly structure includes at least two prefabricated components made of refractory material. The side of the prefabricated component that contacts the aluminum molten metal is the working surface. A stepped splicing seam is provided between two connected prefabricated components. Fiber paper is pasted onto the stepped surface of the splicing seam through water glass. The splicing seam is filled with corundum self-flowing castable. The splicing seam, fiber paper, and corundum self-flowing castable are used to prevent aluminum leakage when the aluminum molten metal flows along the gaps between the joint surfaces of different materials.

[0005] Preferably, the modulus of the water glass is 2.4 to 3.3.

[0006] Preferably, the fiber paper is mullite fiber paper, and the thickness of the mullite fiber paper is determined according to the total length L of all preforms: when L > 2m, the thickness of the mullite fiber paper is 2mm; when L ≤ 2m, the thickness of the mullite fiber paper is 1mm.

[0007] Preferably, the mullite fiber paper is polycrystalline mullite fiber paper with an alumina content >72% and a maximum operating temperature of 1600℃.

[0008] Specifically, polycrystalline mullite fiber paper is heat resistant and has certain elasticity, toughness and compressibility, which can eliminate the thermal stress concentration caused by the thermal expansion of precast components and the resulting thermal stress effect on the splicing joints.

[0009] Preferably, the upper width L1 of the splice joint is less than the lower width L2, and L1 is 25~35mm and L2 is 50~70mm. The upper depth H1 of the splice joint is equal to the lower depth H2, and the sum of H1 and H2 is equal to the thickness of the precast component.

[0010] Preferably, the corners of the splice seams are set as arcs with a radius of 4 to 6 mm.

[0011] Specifically, this can prevent corner cracking caused by the thermal expansion of the precast component and the pressure generated by the corundum self-flowing castable.

[0012] Preferably, the alumina content of the corundum self-flowing castable is >90%, and the bulk density is 2.85~3.05 g / cm³. 3 Its compressive strength is 30~35MPa.

[0013] Specifically, corundum self-flowing castable has high strength and high alumina content, and has high resistance to corrosion from molten aluminum and aluminum slag. It can be self-flowing and formed during construction without vibration, making it convenient to construct in confined spaces. It also ensures that the joints do not fall off or get damaged during use, thus guaranteeing the integrity of the joint position.

[0014] This invention also proposes a construction method for the assembly structure of the inner lining of an aluminum liquid purification equipment, including the following steps: S1. Connect any two prefabricated components and adjust the size of the joint to the design value; S2. After applying water glass to the stepped surface inside the splicing seam, paste the fiber paper. S3. Based on the assembly structure, reserve one direction as the pouring opening and close the other directions; S4. Mix the corundum self-flowing casting material to make a flowable clay. S5. Pour corundum self-flowing castable mortar into the joint from the opening; S6. Smooth the pouring surface with a shovel, allow it to cure naturally, and then remove the sealing material.

[0015] Preferably, in step S3, the material used to close the remaining directions is fiber paper, adhesive tape, or template.

[0016] Preferably, in step S4, the mixing time of the corundum self-flowing castable slurry is not less than 3 minutes to ensure that there are no lumps and the fluidity meets the standard.

[0017] The beneficial effects of this invention are: (1) Excellent aluminum leakage prevention performance: The splicing seam structure blocks the aluminum liquid leakage path. Combined with the high density of corundum self-flowing casting material and the sealing and buffering of mullite fiber paper, the problem of aluminum leakage at the seam is completely solved. (2) Eliminate thermal stress concentration: Mullite fiber paper has high elasticity and low thermal conductivity (use temperature 1600℃, far exceeding the working temperature 800℃), which can absorb the thermal stress generated by the high temperature expansion of the precast parts and avoid cracking of the lining.

[0018] (3) Simple and efficient construction: Corundum self-flowing castable does not require vibration and is suitable for operation in narrow spaces; the overall construction steps are few and no complicated equipment is required, which can greatly shorten the construction period. (4) Strong material compatibility: Water glass, mullite fiber paper and corundum self-flowing castable are all commercially available materials, and the three have matching physical and chemical properties (high temperature resistance and aluminum liquid corrosion resistance), ensuring the overall service life of the lining. (5) High safety and reliability: The lining is free from cracks and aluminum leakage, which can ensure the long-term safe and stable operation of the aluminum liquid purification equipment under high temperature conditions. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 for Figure 1 Sectional view along the AA direction.

[0022] In the figure: 1. Working surface, 2. Precast component, 3. Fiber paper, 4. Corundum self-flowing castable. Detailed Implementation

[0023] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely illustrative and is not intended to limit the scope of the invention. Any modifications, equivalent substitutions, or improvements made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the scope of protection of the present invention.

[0024] Example 1 like Figure 1-2As shown, this embodiment of the invention provides an internal lining assembly structure for an aluminum liquid purification device, including two prefabricated components 2 made of refractory material. The side of the prefabricated component that contacts the aluminum liquid is the working surface 1. A stepped splicing seam is provided between the two prefabricated components. Fiber paper 3 is pasted on the stepped surface of the splicing seam through water glass. The splicing seam is filled with corundum self-flowing castable 4. The splicing seam, fiber paper, and corundum self-flowing castable 4 are used to prevent aluminum leakage when the aluminum liquid flows along the gaps between the joint surfaces of different materials.

[0025] The modulus of the water glass is 2.4 to 3.3; the fiber paper is polycrystalline mullite fiber paper, and the thickness of the polycrystalline mullite fiber paper is determined according to the total length L of the two preforms: when L > 2m, the thickness is 2mm; when L ≤ 2m, the thickness is 1mm.

[0026] Understandably, polycrystalline mullite fiber paper, using existing technologies such as those from Zhejiang Hongda Crystal Fiber Co., Ltd., features low thermal conductivity, low heat capacity, thermal shock resistance, excellent flexibility, tear resistance, is asbestos-free, corrosion-resistant, does not react with molten aluminum, and has excellent machinability. Its thickness is available in the range of 1-4mm. Its function is to eliminate thermal stress concentration caused by the thermal expansion of prefabricated components and the resulting thermal stress effect on the splicing seams.

[0027] The physicochemical properties of polycrystalline mullite fiber paper are shown in the table below:

[0028] The upper width L1 of the splice joint is less than the lower width L2, and L1 is 30mm and L2 is 60mm. The upper depth H1 of the splice joint is equal to the lower depth H2, and the sum of H1 and H2 is equal to the thickness of the precast component. The corner of the splice joint is set as an arc with a radius of 5mm. This can avoid corner cracking caused by the thermal expansion of the precast component and the pressure generated by the corundum self-flowing castable.

[0029] In addition, corundum self-flowing castables, using existing technologies such as those from Zhengzhou Xindeyuan Refractory Materials Co., Ltd., are characterized by high strength, high alumina content, and high resistance to erosion by molten aluminum and aluminum slag. They can be self-flowing and formed during construction without vibration, making them convenient for construction in confined spaces. They also prevent joints from falling off or being damaged during use, ensuring the integrity of the joints. Their function is to degas and level themselves without vibration by relying on their own gravity, thereby achieving densification.

[0030] The physicochemical properties of corundum self-flowing castables are shown in the table below:

[0031] Example 2 This invention provides a construction method for the assembly structure of the inner lining of an aluminum liquid purification equipment, including the following steps: S1. Connect the two prefabricated components together and adjust the size of the splice joint to the design value; S2. After applying water glass to the stepped surface within the splicing seam, paste polycrystalline mullite fiber paper. S3. Based on the assembly structure, reserve one direction as a pouring opening, and close the other directions with templates; S4. Mix the corundum self-flowing castable to make a flowable clay. The mixing time should be no less than 3 minutes to ensure that there are no lumps and the fluidity meets the standard. S5. Pour corundum self-flowing castable mortar into the joint from the opening; S6. Smooth the pouring surface with a shovel, allow it to cure naturally, and then remove the sealing material.

[0032] The embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A lining assembly structure for an aluminum liquid purification device, comprising at least two prefabricated components made of refractory material, characterized in that: The side of the precast component that contacts the molten aluminum is the working surface. A stepped splicing seam is set between two connected precast components. Fiber paper is pasted on the stepped surface of the splicing seam through water glass, and the splicing seam is filled with corundum self-flowing castable.

2. The lining assembly structure of an aluminum liquid purification equipment according to claim 1, characterized in that: The modulus of water glass is 2.4 to 3.

3.

3. The lining assembly structure of an aluminum liquid purification equipment according to claim 1, characterized in that: The fiber paper is made of mullite fiber paper. The thickness of the mullite fiber paper is determined according to the total length L of all prefabricated parts: when L > 2m, the thickness of the mullite fiber paper is 2mm; when L ≤ 2m, the thickness of the mullite fiber paper is 1mm.

4. The lining assembly structure of an aluminum liquid purification equipment according to claim 3, characterized in that: Mullite fiber paper is a polycrystalline mullite fiber paper with an alumina content of >72% and a maximum service temperature of 1600℃.

5. The lining assembly structure of an aluminum liquid purification equipment according to claim 1, characterized in that: The upper width L1 of the splice joint is less than the lower width L2, and L1 is 25~35mm and L2 is 50~70mm. The upper depth H1 of the splice joint is equal to the lower depth H2, and the sum of H1 and H2 is equal to the thickness of the precast component.

6. The lining assembly structure of an aluminum liquid purification equipment according to claim 1, characterized in that: The corners of the seams are designed as arcs with a radius of 4-6mm.

7. The lining assembly structure of an aluminum liquid purification equipment according to claim 1, characterized in that: The alumina content of the corundum self-flowing castable is >90%, and the bulk density is 2.85~3.05 g / cm³. 3 Its compressive strength is 30~35MPa.

8. A construction method for the lining assembly structure of an aluminum liquid purification equipment according to claim 1, characterized in that: Includes the following steps: S1. Connect any two prefabricated components and adjust the size of the joint to the design value; S2. After applying water glass to the stepped surface inside the splicing seam, paste the fiber paper. S3. Based on the assembly structure, reserve one direction as the pouring opening and close the other directions; S4. Mix the corundum self-flowing casting material to make a flowable clay. S5. Pour corundum self-flowing castable mortar into the joint from the opening; S6. Smooth the pouring surface with a shovel, allow it to cure naturally, and then remove the sealing material.

9. A construction method for the lining assembly structure of an aluminum liquid purification equipment according to claim 8, characterized in that: In step S3, the material used to close the remaining directions is fiber paper, adhesive tape, or template.

10. A construction method for the lining assembly structure of an aluminum liquid purification equipment according to claim 8, characterized in that: In step S4, the mixing time of the corundum self-flowing castable slurry shall not be less than 3 minutes to ensure that there are no lumps and the fluidity meets the standard.

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