Tank bottom structure capable of prolonging service cycle of torpedo ladle and manufacturing method

Abstract

A tank bottom structure capable of prolonging the service cycle of a torpedo tank is composed of a tank bottom shell, a heat preservation layer, a permanent layer and a working layer, a reinforced refractory material layer is arranged on the working layer, the thickness of the reinforced refractory material layer is at least 10% of the total thickness of a torpedo tank bottom refractory material, and the area of the reinforced refractory material layer is 1.4-2.5 times of the area of a torpedo tank opening; an anti-corrosion refractory material layer is arranged on the reinforced refractory material layer, the thickness of the anti-corrosion refractory material layer is at least 8% of the total thickness of the torpedo ladle bottom refractory material, the area of the anti-corrosion refractory material layer is 1.2-2.3 times of the area of a torpedo ladle opening, and the area of the anti-corrosion refractory material layer is smaller than that of the reinforced refractory material layer by not more than 18%; the manufacturing method comprises the steps of cleaning the tank bottom working layer; pouring a reinforced refractory material layer; pouring an anti-corrosion refractory material layer; curing for 2-3 days, and baking; and using. According to the method, the process requirement of adding the scrap steel into the ladle under the large scrap steel ratio can be met, and the service cycle of the torpedo ladle can be prolonged to be not lower than 1760 heat from current about 1653 heat.

Description

Technical Field

[0001] The invention relates to a torpedo tank structure, in particular to a torpedo tank bottom structure and a manufacturing method thereof. Background Art

[0002] Torpedo ladles are used to hold molten iron. Their large loading capacity and long transport distances make them the preferred transport equipment for many large steel companies. Torpedo ladles have long operating cycles. The lifespan of their brick linings, along with their safe and stable operation, directly impact iron and steelmaking production, and also influence process efficiency and costs. With advancements in ironmaking technology, blast furnace molten iron temperatures have gradually increased to 1500°C, and the silicon content in the molten iron has been controlled to between 0.3% and 0.5%. Therefore, on the one hand, the torpedo tank lining is subjected to higher temperature thermal shock, making brick linings of the same material more susceptible to spalling and erosion. The increased molten iron temperature and reduced silicon content in the molten iron enhance the fluidity of the molten iron and slag. The brick lining is in direct contact with the molten iron, subjecting it to the dual damage of molten iron flow and chemical reactions, causing it to become brittle and thin. To reduce the iron-steel ratio, many domestic steel mills are adding scrap steel to the torpedo tanks. As the scrap steel ratio increases in the steel production process, the impact and erosion of the tank lining are also exacerbated, especially in the impact zone at the bottom of the tank, which is most affected by the molten iron. If the bottom refractory material is damaged, it can easily cause safety accidents such as molten iron leaks. For example, the furnace life of a 320t torpedo tank at one steel plant was assessed at 1800 cycles before adding scrap steel, but this was reduced to 1600 cycles after adding scrap steel.

[0003] As a refractory material for the torpedo tank bottom reinforcement layer, it is crucial to possess resistance to thermal shock, impact from scrap steel and molten iron, slag erosion, and wear. Currently, torpedo tanks mostly use aluminum carbide silicon carbon bricks as the working layer. This layer is in direct contact with high-temperature molten iron and scrap steel. Adding scrap steel lowers the temperature, causing the scrap steel to not melt or solidify into lumps. This increases the thermal and mechanical stress impact on the torpedo tank bottom, causing damage to the torpedo tank bottom and seriously shortening its service life.

[0004] After searching: Chinese patent application number CN202111126858.9 discloses a "Torpedo Tank Working Layer Repair Material," which primarily addresses the technical problem of reduced working lining life, caused by damage to the working lining due to the addition of scrap steel and the addition of slag magnetic separation materials in previous processes. The technical solution is a torpedo tank working layer repair material composed of the following raw materials by weight: 45% to 55% corundum, 10% to 15% lightweight alumina, 5% to 10% feldspar glaze, and 5% to 18% pure calcium aluminate cement. The document describes a material primarily used to repair damaged working layers of torpedo tanks. However, it lacks resistance to molten iron impact and erosion, and thus does not significantly improve the overall lifespan or operating efficiency of the torpedo tank.

[0005] Chinese patent application number CN202311790282.5 discloses a "torpedo tank impact-resistant brick." Its raw materials include 5-10 parts 5-3 alumina clinker, 15-18 parts 3-1 alumina clinker, 8-12 parts 3-1 brown corundum, 25-30 parts 1-0 brown corundum, 6-10 parts 200-mesh silicon carbide, 14-18 parts flake graphite, 1-3 parts 200-mesh aluminum powder, 12-14 parts material A, and 3-3.5 parts phenolic resin. Material A has the following formula: 60-62 parts 325-mesh white corundum, 38-41 parts 325-mesh silicon nitride, and 0.5-1 part catalyst. The brick described in this document is actually an ASC refractory brick. Because it uses flake graphite, it easily oxidizes and becomes loose under high-temperature conditions, leading to the intrusion of molten iron and consequently, damage to the refractory brick.

[0006] Chinese patent application number CN201420641851.X discloses a "shock-resistant torpedo tank lining structure." The structure comprises a metal shell with a mouth at its upper center. The inner wall of the shell is coated with a layer of FN-130 spray paint, which is then topped with an Al2O3-SiC-C brick layer. The inner wall of the mouth is coated with an amorphous steel fiber castable. The Al2O3-SiC-C brick layer at the bottom of the metal shell is thicker than that at other locations. Furthermore, an anti-shock platform is located on the Al2O3-SiC-C brick layer directly below the mouth. Positioning posts are located between the anti-shock platform and the Al2O3-SiC-C brick layer. This document installs an impact-resistant platform on the Al2O3-SiC-C brick layer directly below the tank mouth. However, it does not provide a layered design based on the impact of molten iron on the impact platform, nor does it describe the material used for the impact platform. This merely thickens the structure, but it cannot guarantee the bottom's resistance to molten iron corrosion directly below the tank mouth, nor can it fundamentally improve the tank bottom's lifespan.

[0007] With the metallurgical industry trending towards high scrap rates and the pursuit of extreme efficiency, extending the service life of torpedo tanks and reducing the number of repairs is imperative. The most important measure is to extend the service life of the torpedo tank bottom and reduce wear and tear. Summary of the Invention

[0008] The present invention aims to overcome the deficiencies of the prior art and provide a tank bottom structure and a manufacturing method for a torpedo tank, which can improve the service life of the torpedo tank from the current 1653 heats to not less than 1760 heats, by providing a tank bottom structure and a manufacturing method for a torpedo tank, which can improve the service life of the torpedo tank. The present invention overcomes the deficiencies of the prior art and provides a tank bottom structure and a manufacturing method for a torpedo tank, which can improve the service life of the torpedo tank from the current 1653 heats to not less than 1760 heats, in the process of adding scrap steel to the existing ladle.

[0009] Measures to achieve the above objectives: A tank bottom structure capable of increasing the service life of a torpedo tank comprises a tank bottom outer shell, an insulation layer built within the tank bottom outer shell, a permanent layer, and a working layer. The structure comprises: a reinforced refractory material layer is provided on the working layer, the thickness of the layer being at least 10% of the total thickness of the refractory material of the torpedo tank bottom, and the area of ​​the layer being 1.4 to 2.5 times the area of ​​the torpedo tank mouth; an anti-corrosion refractory material layer is provided on the reinforced refractory material layer, the thickness of the layer being at least 8% of the total thickness of the refractory material of the torpedo tank bottom, and the area of ​​the layer being 1.2 to 2.3 times the area of ​​the torpedo tank mouth; the area of ​​the anti-corrosion refractory material layer being less than the area of ​​the reinforced refractory material layer by no more than 18%.

[0010] The invention is characterized in that the raw material composition and weight percentage of the reinforced refractory material layer are as follows: 35-50% of fused corundum with a particle size of 3-5 mm, 5-10% of waste mullite brick aggregate with a particle size of 1-3 mm, 3-14% of silicon carbide with a particle size of 0.088 mm or less, 10-30% of white corundum fine powder with a particle size of 0.088 mm or less, 0.01-5% of alumina micropowder with a particle size of 3-6 μm, 2.5-9% of alumina micropowder with a particle size of 0.088 mm or less, 1-5% of mesophase asphalt powder with a particle size of 0.088 mm or less, 0.1-2% of aluminum powder with a particle size of 0.01 mm or less, and 3-6% of calcium aluminate cement binder; and 3-10% of water is added to the total amount of the above raw materials.

[0011] The method for preparing the refractory material for the reinforced refractory material layer is as follows: 1) Prefabricated mixture A is prepared by mixing silicon carbide, white corundum fine powder, alumina fine powder, aluminum powder, and calcium aluminate cement in proportion by weight for 5 to 25 minutes to obtain prefabricated mixture A; 2) Prefabricated mixture B is prepared by mixing fused corundum and waste mullite brick aggregate weighed in proportion by weight, and stirring for 15 to 35 minutes to obtain prefabricated mixture B; 3) Mix precast mix A and precast mix B and stir and dry mix for 10 to 30 minutes; 4) Set aside.

[0012] The invention is characterized in that the raw material composition and weight percentage of the anti-corrosion refractory material layer are as follows: 50-65% of fused mullite aggregate with a particle size of 1-5 mm, 3-14% of andalusite with a particle size of 0.1-0.01 mm, 4-9% of alumina micropowder with a particle size of 3-6 μm, 0.5-6% of silicon nitride with a particle size of ≤0.088 mm, 3-15% of zirconium mullite fine powder with a particle size of ≤0.074 mm, 1-3% of silicone resin powder with a particle size of ≤0.088 mm, 2-5% of high-temperature modified asphalt, and 2-8% of calcium aluminate cement binder; and 3-8% of water based on the total amount of the above raw materials.

[0013] The method for preparing the refractory material of the anti-corrosion refractory material layer is as follows: 1) Prefabricated mixture C is prepared by mixing andalusite and calcium aluminate cement weighed in proportion by weight for 5 to 25 minutes to obtain prefabricated mixture C; 2) Prefabricated mixture D is prepared by mixing silicon nitride, fused mullite, zirconium mullite fine powder, aluminum powder, silicone resin powder and high-temperature modified asphalt in proportion by weight, and stirring for 15 to 35 minutes to obtain prefabricated mixture D; 3) Mix precast mix C and precast mix D and stir and dry mix for 10 to 30 minutes; 4) Set aside.

[0014] A method for manufacturing a torpedo tank bottom structure capable of increasing the service life of the torpedo tank comprises the following steps: 1) First, clean the working layer at the bottom of the torpedo tank; 2) Pour reinforced refractory materials to form a reinforced refractory layer, the thickness of which is at least 10% of the total thickness of the refractory material at the bottom of the torpedo tank, and its area is 1.4 to 2.5 times the area of ​​the torpedo tank mouth; and maintain for not less than 22 hours; 3) pouring anti-corrosion refractory material on the reinforced refractory layer to form an anti-corrosion refractory layer; providing an anti-corrosion refractory layer on the reinforced refractory layer, the thickness of which is at least 8% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​which is 1.2 to 2.3 times the area of ​​the torpedo tank mouth; 4) After curing at room temperature for 2 to 3 days, bake at a temperature of 600 to 1000°C for no less than 5 days; 5) Start the furnace for use.

[0015] Function and mechanism of the main structure and preparation process of the present invention The reason why the present invention provides a reinforced refractory layer on the working layer and an anti-corrosion refractory layer on the reinforced refractory layer is that the high-temperature molten iron poured from the tank mouth first contacts the anti-corrosion refractory layer, and the S, P, O, etc. contained in the molten iron first have a corrosive effect on the refractory material in contact. The anti-corrosion refractory layer can play an anti-corrosion role on the molten iron. At the same time, the molten iron poured from the tank mouth has the greatest impact force on the tank bottom directly below the tank mouth, and the reinforced refractory layer can effectively resist the impact force of the molten iron.

[0016] The present invention controls the thickness of the reinforced refractory layer to at least 10% of the total refractory thickness of the torpedo tank bottom, and its area is 1.4 to 2.5 times the area of ​​the torpedo tank mouth; and curing for at least 22 hours. This is because if the reinforced refractory layer is less than 10%, it cannot effectively resist the impact of molten iron, and molten iron poured from the tank mouth will disperse and wash the tank bottom. If the area is less than 1.4 times the tank mouth, it cannot ensure that the molten iron will not be completely washed on the reinforced refractory layer. If it is greater than 2.5 times the tank mouth area, it will result in excessive waste of reinforced layer material. Curing for at least 22 hours is to ensure that the reinforced refractory layer has good strength at room temperature.

[0017] The reason why the present invention controls the thickness of the anti-corrosion refractory material layer to be at least 8% of the total thickness of the refractory material of the torpedo tank bottom and its area is 1.2 to 2.3 times the area of ​​the torpedo tank mouth is that if the thickness of the anti-corrosion refractory material layer is less than 8%, it cannot effectively resist the corrosiveness of molten iron, and the molten iron poured from the tank mouth will disperse and erode the tank bottom. If the area is less than 1.2 times the tank mouth, it cannot be guaranteed that the molten iron can be completely flushed on the reinforced refractory material layer. If it is greater than 2.3 times the tank mouth area, it will lead to excessive waste of erosion layer material.

[0018] The reason why the present invention performs curing at room temperature for 2 to 3 days and baking at a baking temperature of 600 to 1000° C. for not less than 5 days after preparation is that better strength is formed at room temperature and volatile matter and water vapor in the refractory castable are gradually discharged to prevent cracking of the refractory castable.

[0019] The refractory material for the reinforced refractory layer of the present invention adopts 35-50% of fused corundum with a particle size of 3-5 mm, 5-10% of waste mullite brick aggregate with a particle size of 1-3 mm, 3-14% of silicon carbide with a particle size of ≤0.088 mm, 10-30% of white corundum fine powder with a particle size of ≤0.088 mm, 0.01-5% of alumina micropowder with a particle size of 3-6 μm, 2.5-9% of alumina micropowder with a particle size of ≤0.088 mm, 1-5% of mesophase asphalt powder with a particle size of ≤0.088 mm, 0.1-2% of aluminum powder with a particle size of ≤0.01 mm, and 3-6% of calcium aluminate cement binder; and 3-10% of water is added to the total amount of the above raw materials. This is because the use of multi-level batching according to different particle sizes, namely large particles, medium particles and small particles, is more conducive to improving the bulk density and construction performance. Adding 3-10% water to the total raw material volume facilitates the mixing and forming of the castable. Adding too much water will reduce the bulk density and strength of the castable. Adding too little water will not be conducive to the mixing and forming of the castable.

[0020] The raw materials for the corrosion-resistant refractory layer of the present invention are: 50-65% fused mullite aggregate with a particle size of 1-5 mm, 3-14% andalusite with a particle size of 0.1-0.01 mm, 4-9% alumina powder with a particle size of 3-6 μm, 0.5-6% silicon nitride with a particle size ≤0.088 mm, 3-15% zirconium mullite fine powder with a particle size ≤0.074 mm, 1-3% silicone resin powder with a particle size ≤0.088 mm, 2-5% high-temperature modified asphalt, and 2-8% calcium aluminate cement binder. Water is added to the castable material at a rate of 3-8% of the total amount. This is because the use of multi-grade batching of different particle sizes, such as large, medium, and small particles, is more conducive to improving bulk density and workability. Adding 3-8% of water to the castable material facilitates mixing and molding. Excessive water addition reduces the castable's bulk density, increases porosity, and reduces the material's resistance to molten iron corrosion. Adding too little water is not conducive to the mixing and forming of the castable.

[0021] Compared with the prior art, the present invention has the following beneficial effects: (1) The reinforcement layer and anti-erosion layer casting materials are poured on the working layer opposite to the tank bottom and the tank mouth, which effectively improves the safety of the tank bottom and the service life of the refractory material, that is, from the current 1653 heats to no less than 1760 heats.

[0022] (2) It is cast in two layers. The upper layer is mainly used to resist the erosion and wear of scrap steel and hot molten iron, and the lower reinforcement layer is mainly used to improve the impact resistance of the tank bottom and ensure the safety of the tank bottom.

[0023] (3) The working layer bricks are made of mullite silicon carbide andalusite bricks with staggered joints, which enhances the thermal shock resistance, impact resistance, oxidation resistance and tightness of the working layer.

[0024] (4) In the existing technology, the part of the tank bottom facing the tank mouth is subject to the greatest impact from molten iron and scrap steel, and is the most vulnerable part. Adding a reinforcement layer enhances the strength of the tank bottom working layer. At the same time, the part of the tank bottom facing the pipe warehouse is the part in direct contact with scrap steel and molten iron, and is severely subject to scrap wear and molten iron erosion, especially the impact of molten iron and scrap steel and the oxidizing properties of slag. This effectively solves the problem of tank bottom corrosion.

[0025] (5) The pouring area of ​​the reinforcement layer and the anti-corrosion layer is 1.25 to 3 times the area of ​​the tank mouth, not the entire inner wall of the torpedo tank. This scientific selective pouring is beneficial to saving costs and increasing the service life of the torpedo tank.

[0026] (6) Mullite is used in the entire ladle lining refractory system, which has uniform expansion, excellent thermal shock stability, high load softening point, small high temperature creep value, high hardness and good chemical corrosion resistance.

[0027] (7) The use of intermediate phase asphalt, which becomes liquid spherical at high temperature, helps to fill the pores of the material and reduce the erosion of the material.

[0028] (8) Silicone resin and high-temperature modified asphalt are used, both of which are high-molecular polymers. They depolymerize and repolymerize at high temperatures to form high-molecular silicon carbide whiskers, which greatly improves the material's oxidation resistance and impact resistance.

[0029] Using zirconium mullite as part of the fine powder effectively improves the chemical corrosion resistance of the castable matrix and the corrosion resistance of the anti-corrosion layer. The laboratory conducted a crucible slag test and found that the slag corrosion resistance was improved by more than 8%. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the cross-sectional structure of the bottom of the torpedo tank of the present invention; In the figure: 1-tank bottom shell, 2-insulation layer, 3-permanent layer, 4-working layer, 5-reinforced refractory layer, 6-anti-corrosion refractory layer. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the drawings: Example 1 The tank opening area of ​​this embodiment is 6m 2 The total thickness of the refractory material of the torpedo tank bottom is 350mm; A tank bottom structure capable of increasing the service life of a torpedo tank comprises a tank bottom shell 1, an insulation layer 2 built within the tank bottom shell 1, a permanent layer 3, and a working layer 4. A reinforced refractory material layer 5 is cast on the working layer 4, wherein the thickness of the reinforced refractory material layer 5 is 22% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​the reinforced refractory material layer 5 is twice the area of ​​the torpedo tank mouth. An anti-corrosion refractory material layer 6 is cast on the reinforced refractory material layer 5, wherein the thickness of the reinforced refractory material layer 5 is 20% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​the reinforced refractory material layer 6 is 1.8 times the area of ​​the torpedo tank mouth. The area of ​​the anti-corrosion refractory material layer 6 is 11% less than that of the reinforced refractory material layer.

[0032] The raw material composition and weight percentage of the reinforced refractory material layer 5 are as follows: fused corundum with a particle size of 3 to 5 mm: 41%, waste mullite brick aggregate with a particle size of 1 to 3 mm: 10%, silicon carbide with a particle size of ≤0.088 mm: 9%, white corundum fine powder with a particle size of ≤0.088 mm: 21%, alumina fine powder with a particle size of 3 to 6 μm: 3.5%, alumina fine powder with a particle size of ≤0.088 mm: 6.5%, mesophase pitch powder with a particle size of ≤0.088 mm: 3%, aluminum powder with a particle size of ≤0.01 mm: 1%, calcium aluminate cement binder: 5%; and water accounting for 6% of the total amount of the above raw materials. The method for preparing the refractory material of the reinforced refractory material layer 5 comprises the following steps: 1) Prefabricated mixture A is prepared by mixing silicon carbide, white corundum fine powder, alumina fine powder, aluminum powder, and calcium aluminate cement in proportion by weight for 18 minutes to obtain prefabricated mixture A; 2) Prefabricated mixture B was prepared by mixing fused corundum and waste mullite brick aggregate weighed in proportion by weight and stirring for 31 minutes to obtain prefabricated mixture B; 3) Mix precast mix A and precast mix B and stir and dry mix for 24 minutes; 4) Set aside.

[0033] The raw material composition and weight percentage content of the anti-corrosion refractory material layer 6 are as follows: fused mullite aggregate with a particle size of 1 to 5 mm: 51%, andalusite with a particle size of 0.1 to 0.01 mm: 11%, alumina powder with a particle size of 3 to 6 μm: 8%, silicon nitride with a particle size of ≤0.088 mm: 5.5%, zirconium mullite fine powder with a particle size of ≤0.074 mm: 14.5%, silicone resin powder with a particle size of ≤0.088 mm: 2%, high-temperature modified asphalt: 4%, calcium aluminate cement binder, 4%; plus 6% water of the total amount of the above raw materials.

[0034] The refractory material preparation method of the anti-corrosion refractory material layer 6 comprises the following steps: 1) Prefabricated mixture C is prepared by mixing andalusite and calcium aluminate cement weighed in proportion by weight for 24 minutes to obtain prefabricated mixture C; 2) Prefabricated mixture D is prepared by mixing silicon nitride, fused mullite, zirconium mullite fine powder, aluminum powder, silicone resin powder and high-temperature modified asphalt in proportion by weight, and stirring for 32 minutes to obtain prefabricated mixture D; 3) Mix precast mix C and precast mix D and stir and dry mix for 28 minutes; 4) Set aside.

[0035] The manufacturing method of the torpedo tank bottom structure comprises the following steps: 1) First clean the working layer 4 at the bottom of the torpedo tank; 2) pouring reinforced refractory material to form a reinforced refractory material layer 5, the thickness of which is 22% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​which is twice the area of ​​the torpedo tank mouth; and curing for 28 hours; 3) pouring an anti-corrosion refractory material on the reinforced refractory material layer 5 to form an anti-corrosion refractory material layer 6; the thickness of this layer is 20% of the total thickness of the refractory material of the torpedo tank bottom, and its area is 1.8 times the area of ​​the torpedo tank mouth; 4) After curing at room temperature for 3 days, bake at a temperature of 625°C for 7 days; 5) Start the furnace for use.

[0036] After use and testing, it was found that after 1,780 furnaces were put into use, the bottom of the torpedo tank still had no pits, cracks or other damage or corrosion, the number of repairs was reduced to 3 times, and the turnover efficiency was improved by 12%.

[0037] Example 2 The tank opening area of ​​this embodiment is 5m 2 The total thickness of the refractory material of the torpedo tank bottom is 330mm; A tank bottom structure capable of increasing the service life of a torpedo tank comprises a tank bottom outer shell 1, an insulation layer 2 built within the tank bottom outer shell 1, a permanent layer 3, and a working layer 4. A reinforced refractory material layer 5 is cast on the working layer 4, wherein the thickness of the reinforced refractory material layer 5 is 21% of the total thickness of the refractory material of the torpedo tank bottom, and the area of ​​the reinforced refractory material layer 5 is 1.82 times the area of ​​the torpedo tank mouth. An anti-corrosion refractory material layer 6 is cast on the reinforced refractory material layer 5, wherein the thickness of the reinforced refractory material layer 5 is 18% of the total thickness of the refractory material of the torpedo tank bottom, and the area of ​​the reinforced refractory material layer 6 is 17.5% less than the area of ​​the reinforced refractory material layer.

[0038] The raw material composition and weight percentage content of the reinforced refractory material layer 5 are as follows: fused corundum with a particle size of 3 to 5 mm: 42%, waste mullite brick aggregate with a particle size of 1 to 3 mm: 9.5%, silicon carbide with a particle size ≤0.088 mm: 12%, white corundum fine powder with a particle size ≤0.088 mm: 19%, alumina micropowder with a particle size of 3 to 6 μm: 4.2%, alumina micropowder with a particle size ≤0.088 mm: 4.3%, mesophase asphalt powder with a particle size ≤0.088 mm: 2.5%, aluminum powder with a particle size ≤0.01 mm: 0.4%, calcium aluminate cement binder: 6.1%; plus 6.5% of the total amount of the above raw materials, water.

[0039] Preparation method of the refractory material of the reinforced refractory material layer 5: 1) Prefabricated mixture A is prepared by mixing silicon carbide, white corundum fine powder, alumina fine powder, aluminum powder, and calcium aluminate cement in proportion by weight for 22 minutes to obtain prefabricated mixture A; 2) Prefabricated mixture B was prepared by mixing fused corundum and waste mullite brick aggregate weighed in proportion by weight and stirring for 33 minutes to obtain prefabricated mixture B; 3) Mix precast mix A and precast mix B and stir and dry mix for 26 minutes; 4) Set aside.

[0040] The raw material composition and weight percentage content of the anti-corrosion refractory material layer 6 are as follows: fused mullite aggregate with a particle size of 1 to 5 mm: 60%, andalusite with a particle size of 0.1 to 0.01 mm: 12%, alumina powder with a particle size of 3 to 6 μm: 7%, silicon nitride with a particle size of ≤0.088 mm: 4.5%, zirconium mullite fine powder with a particle size of ≤0.074 mm: 6.5%, silicone resin powder with a particle size of ≤0.088 mm: 2%, high-temperature modified asphalt: 3.5%, calcium aluminate cement binder, 5.5%; plus 4.8% water of the total amount of the above raw materials.

[0041] The refractory material preparation method of the anti-corrosion refractory material layer 6 comprises the following steps: 1) Prefabricated mixture C is prepared by mixing andalusite and calcium aluminate cement weighed in proportion by weight for 21 minutes to obtain prefabricated mixture C; 2) Prefabricated mixture D was prepared by mixing silicon nitride, fused mullite, zirconium mullite fine powder, aluminum powder, silicone resin powder, and high-temperature modified asphalt in proportion by weight and stirring for 31 minutes to obtain prefabricated mixture D; 3) Mix precast mix C and precast mix D and stir and dry mix for 17 minutes; 4) Set aside.

[0042] The manufacturing method of the torpedo tank bottom structure comprises the following steps: 1) First clean the working layer 4 at the bottom of the torpedo tank; 2) pouring reinforced refractory material to form a reinforced refractory material layer 5, the thickness of which is 21% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​which is 1.82 times the area of ​​the torpedo tank mouth; and curing for 22 hours; 3) pouring an anti-corrosion refractory material on the reinforced refractory material layer 5 to form an anti-corrosion refractory material layer; the thickness of this layer is 18% of the total thickness of the refractory material of the torpedo tank bottom, and its area is 1.5 times the area of ​​the torpedo tank mouth; 4) After curing at room temperature for 2.5 days, bake at a temperature of 715°C for 6.7 days; 5) Start the furnace for use.

[0043] After use and testing, it was found that after 1796 furnaces were put into use, the bottom of the torpedo tank still had no pits, cracks or other damage or corrosion, the number of repairs was reduced to 4 times, and the turnover efficiency was improved by 15%.

[0044] Example 3 The tank opening area of ​​this embodiment is 4m 2 The total thickness of the refractory material of the torpedo tank bottom is 300mm; A tank bottom structure capable of increasing the service life of a torpedo tank comprises a tank bottom outer shell 1, an insulation layer 2 built within the tank bottom outer shell 1, a permanent layer 3, and a working layer 4. A reinforced refractory material layer 5 is cast on the working layer 4, wherein the thickness of the reinforced refractory material layer 5 is 18% of the total thickness of the refractory material of the torpedo tank bottom, and the area of ​​the reinforced refractory material layer 5 is 1.6 times the area of ​​the torpedo tank mouth. An anti-corrosion refractory material layer 6 is cast on the reinforced refractory material layer 5, wherein the thickness of the reinforced refractory material layer 5 is 16% of the total thickness of the refractory material of the torpedo tank bottom, and the area of ​​the reinforced refractory material layer 6 is 1.45 times the area of ​​the torpedo tank mouth. The area of ​​the anti-corrosion refractory material layer 6 is less than 9% of the area of ​​the reinforced refractory material layer.

[0045] The raw material composition and weight percentage content of the reinforced refractory material layer 5 are as follows: fused corundum with a particle size of 3 to 5 mm: 42%, waste mullite brick aggregate with a particle size of 1 to 3 mm: 7%, silicon carbide with a particle size ≤0.088 mm: 11%, white corundum fine powder with a particle size ≤0.088 mm: 23%, alumina micropowder with a particle size of 3 to 6 μm: 2.6%, alumina micropowder with a particle size ≤0.088 mm: 6.4%, mesophase asphalt powder with a particle size ≤0.088 mm: 2.9%, aluminum powder with a particle size ≤0.01 mm: 1.2%, calcium aluminate cement binder: 3.9%; plus 3.2% water based on the total amount of the above raw materials.

[0046] The method for preparing the refractory material of the reinforced refractory material layer 5 comprises the following steps: 1) Prefabricated mixture A was prepared by mixing silicon carbide, white corundum fine powder, alumina fine powder, aluminum powder, and calcium aluminate cement in proportion by weight for 19 minutes to obtain prefabricated mixture A; 2) Prefabricated mixture B is prepared by mixing fused corundum and waste mullite brick aggregate weighed in proportion by weight and stirring for 32 minutes to obtain prefabricated mixture B; 3) Mix precast mix A and precast mix B and stir and dry mix for 25 minutes; 4) Set aside.

[0047] The raw material composition and weight percentage content of the anti-corrosion refractory material layer 6 are as follows: fused mullite aggregate with a particle size of 1 to 5 mm: 55%, andalusite with a particle size of 0.1 to 0.01 mm: 13%, alumina powder with a particle size of 3 to 6 μm: 4.6%, silicon nitride with a particle size of ≤0.088 mm: 2.4%, zirconium mullite fine powder with a particle size of ≤0.074 mm: 13%, silicone resin powder with a particle size of ≤0.088 mm: 2.8%, high-temperature modified asphalt: 2.6%, calcium aluminate cement binder, 6.6%; plus 5.8% water of the total amount of the above raw materials.

[0048] The refractory material preparation method of the anti-corrosion refractory material layer 6 comprises the following steps: 1) Prefabricated mixture C is prepared by mixing andalusite and calcium aluminate cement weighed in proportion by weight for 17 minutes to obtain prefabricated mixture C; 2) Prefabricated mixture D was prepared by mixing silicon nitride, fused mullite, zirconium mullite fine powder, aluminum powder, silicone resin powder and high-temperature modified asphalt in proportion by weight and stirring for 21 minutes to obtain prefabricated mixture D; 3) Mix precast mix C and precast mix D and stir and dry mix for 25 minutes; 4) Set aside.

[0049] The manufacturing method of the torpedo tank bottom structure comprises the following steps: 1) First clean the working layer 4 at the bottom of the torpedo tank; 2) pouring reinforced refractory material to form a reinforced refractory material layer 5, the thickness of which is 18% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​which is 1.6 times the area of ​​the torpedo tank mouth; and curing for 24 hours; 3) pouring an anti-corrosion refractory material on the reinforced refractory material layer 5 to form an anti-corrosion refractory material layer 6; the thickness of this layer is 16% of the total thickness of the refractory material of the torpedo tank bottom, and its area is 1.45 times the area of ​​the torpedo tank mouth; 4) After curing at room temperature for 2.5 days, bake at a temperature of 825°C for 6.8 days; 5) Start the furnace for use.

[0050] After use and testing, it was found that after 1790 furnaces were put into use, the bottom of the torpedo tank still had no pits, cracks or other damage or corrosion, the number of repairs was reduced to 6 times, and the turnover efficiency was improved by 17%.

[0051] Example 4 The tank opening area of ​​this embodiment is 7.5m 2 The total thickness of the refractory material of the torpedo tank bottom is 410mm; A tank bottom structure capable of increasing the service life of a torpedo tank comprises a tank bottom shell 1, an insulation layer 2 built within the tank bottom shell 1, a permanent layer 3, and a working layer 4. A reinforced refractory material layer 5 is cast on the working layer 4, wherein the thickness of the reinforced refractory material layer 5 is 21% of the total thickness of the refractory material of the torpedo tank bottom, and the area of ​​the reinforced refractory material layer 5 is 1.81 times the area of ​​the torpedo tank mouth. An anti-corrosion refractory material layer 6 is cast on the reinforced refractory material layer 5, wherein the thickness of the reinforced refractory material layer 5 is 17.3% of the total thickness of the refractory material of the torpedo tank bottom, and the area of ​​the reinforced refractory material layer 6 is 1.52 times the area of ​​the torpedo tank mouth. The area of ​​the anti-corrosion refractory material layer 6 is less than 16% of the area of ​​the reinforced refractory material layer 5.

[0052] The raw material composition and weight percentage content of the reinforced refractory material layer 5 are as follows: fused corundum with a particle size of 3 to 5 mm: 50%, waste mullite brick aggregate with a particle size of 1 to 3 mm: 7.6%, silicon carbide with a particle size ≤0.088 mm: 8.4%, white corundum fine powder with a particle size ≤0.088 mm: 23%, alumina micropowder with a particle size of 3 to 6 μm: 1.6%, alumina micropowder with a particle size ≤0.088 mm: 1.8%, mesophase asphalt powder with a particle size ≤0.088 mm: 2.6%, aluminum powder with a particle size ≤0.01 mm: 1.4%, calcium aluminate cement binder: 3.6%; plus 4.1% water of the total amount of the above raw materials.

[0053] The method for preparing the refractory material of the reinforced refractory material layer 5 comprises the following steps: 1) Prefabricated mixture A is prepared by mixing silicon carbide, white corundum fine powder, alumina fine powder, aluminum powder, and calcium aluminate cement in proportion by weight for 25 minutes to obtain prefabricated mixture A; 2) Prefabricated mixture B is prepared by mixing fused corundum and waste mullite brick aggregate weighed in proportion by weight and stirring for 34 minutes to obtain prefabricated mixture B; 3) Mix precast mix A and precast mix B and stir and dry mix for 29 minutes; 4) Set aside.

[0054] The raw material composition and weight percentage content of the anti-corrosion refractory material layer 6 are as follows: fused mullite aggregate with a particle size of 1 to 5 mm: 56%, andalusite with a particle size of 0.1 to 0.01 mm: 12%, alumina powder with a particle size of 3 to 6 μm: 6.4%, silicon nitride with a particle size of ≤0.088 mm: 5.6%, zirconium mullite fine powder with a particle size of ≤0.074 mm: 12%, silicone resin powder with a particle size of ≤0.088 mm: 2.3%, high-temperature modified asphalt: 2.7%, calcium aluminate cement binder, 3%; plus 3.8% water of the total amount of the above raw materials.

[0055] The refractory material preparation method of the anti-corrosion refractory material layer 6 comprises the following steps: 1) Prefabricated mixture C is prepared by mixing andalusite and calcium aluminate cement weighed in proportion by weight for 17 minutes to obtain prefabricated mixture C; 2) Prefabricated mixture D was prepared by mixing silicon nitride, fused mullite, zirconium mullite fine powder, aluminum powder, silicone resin powder, and high-temperature modified asphalt in proportion by weight and stirring for 29.5 minutes to obtain prefabricated mixture D; 3) Mix precast mix C and precast mix D and stir and dry mix for 27 minutes; 4) Set aside.

[0056] The manufacturing method of the torpedo tank bottom structure comprises the following steps: 1) First clean the working layer 4 at the bottom of the torpedo tank; 2) pouring reinforced refractory material to form a reinforced refractory material layer 5, the thickness of which is 21% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​which is 1.81 times the area of ​​the torpedo tank mouth; and curing for 24 hours; 3) pouring an anti-corrosion refractory material on the reinforced refractory material layer 5 to form an anti-corrosion refractory material layer 6, the thickness of which is 17.3% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​which is 1.52 times the area of ​​the torpedo tank mouth; 4) After curing at room temperature for 2.8 days, the product was baked at a temperature of 995°C for 7.3 days. 5) Start the furnace for use.

[0057] After use and testing, it was found that after 1792 furnaces were put into use, the bottom of the torpedo tank still had no pits, cracks or other damage or corrosion, the number of repairs was reduced to 6 times, and the turnover efficiency was improved by 18%.

[0058] Example 5 The tank opening area of ​​this embodiment is 4.5m 2 The total thickness of the refractory material of the torpedo tank bottom is 310mm; A tank bottom structure capable of increasing the service life of a torpedo tank comprises a tank bottom outer shell 1, an insulation layer 2 built within the tank bottom outer shell 1, a permanent layer 3, and a working layer 4. A reinforced refractory material layer 5 is cast on the working layer 4, wherein the thickness of the reinforced refractory material layer 5 is 17% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​the reinforced refractory material layer 5 is 1.53 times the area of ​​the torpedo tank mouth. An anti-corrosion refractory material layer 6 is cast on the reinforced refractory material layer 5, wherein the thickness of the reinforced refractory material layer 5 is 15% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​the reinforced refractory material layer 6 is 1.42 times the area of ​​the torpedo tank mouth. The area of ​​the anti-corrosion refractory material layer 6 is 7.2% less than that of the reinforced refractory material layer.

[0059] The raw material composition and weight percentage content of the reinforced refractory material layer 5 are as follows: fused corundum with a particle size of 3 to 5 mm: 39%, waste mullite brick aggregate with a particle size of 1 to 3 mm: 9%, silicon carbide with a particle size ≤0.088 mm: 13%, white corundum fine powder with a particle size ≤0.088 mm: 20%, alumina micropowder with a particle size of 3 to 6 μm: 4.5%, alumina micropowder with a particle size ≤0.088 mm: 5.5%, mesophase asphalt powder with a particle size ≤0.088 mm: 3.8%, aluminum powder with a particle size ≤0.01 mm: 1.9%, calcium aluminate cement binder: 3.3%; plus 3.8% of the total amount of the above raw materials, water.

[0060] The method for preparing the refractory material of the reinforced refractory material layer 6 comprises the following steps: 1) Prefabricated mixture A is prepared by mixing silicon carbide, white corundum fine powder, alumina fine powder, aluminum powder, and calcium aluminate cement in proportion by weight for 24 minutes to obtain prefabricated mixture A; 2) Prefabricated mixture B was prepared by mixing fused corundum and waste mullite brick aggregate weighed in proportion by weight and stirring for 33 minutes to obtain prefabricated mixture B; 3) Mix precast mix A and precast mix B and stir and dry mix for 23 minutes; 4) Set aside.

[0061] The raw material composition and weight percentage content of the anti-corrosion refractory material layer 6 are as follows: fused mullite aggregate with a particle size of 1 to 5 mm: 58%, andalusite with a particle size of 0.1 to 0.01 mm: 11%, alumina powder with a particle size of 3 to 6 μm: 8%, silicon nitride with a particle size of ≤0.088 mm: 3.3%, zirconium mullite fine powder with a particle size of ≤0.074 mm: 6.7%, silicone resin powder with a particle size of ≤0.088 mm: 2.1%, high-temperature modified asphalt: 3.9%, calcium aluminate cement binder: 7%; plus 6.8% of the total amount of the above raw materials. Water.

[0062] The refractory material preparation method of the anti-corrosion refractory material layer 6 comprises the following steps: 1) Prefabricated mixture C is prepared by mixing andalusite and calcium aluminate cement weighed in proportion by weight for 25 minutes to obtain prefabricated mixture C; 2) Prefabricated mixture D was prepared by mixing silicon nitride, fused mullite, zirconium mullite fine powder, aluminum powder, silicone resin powder and high-temperature modified asphalt in proportion by weight and stirring for 33 minutes to obtain prefabricated mixture D; 3) Mix precast mix C and precast mix D and stir and dry mix for 21 minutes; 4) Set aside.

[0063] The manufacturing method of the torpedo tank bottom structure comprises the following steps: 1) First clean the working layer 4 at the bottom of the torpedo tank; 2) pouring reinforced refractory material to form a reinforced refractory material layer 5, the thickness of which is 17% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​which is 1.53 times the area of ​​the torpedo tank mouth; and curing for 24 hours; 3) pouring an anti-corrosion refractory material on the reinforced refractory material layer 5 to form an anti-corrosion refractory material layer 6, the thickness of which is 15% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​which is 1.42 times the area of ​​the torpedo tank mouth; 4) After curing at room temperature for 2.6 days, bake at a temperature of 880°C for 6.5 days; 5) Start the furnace for use.

[0064] After use and testing, it was found that after 1770 furnaces were put into use, the bottom of the torpedo tank still had no pits, cracks or other damage or corrosion, the number of repairs was reduced to 3 times, and the turnover efficiency was improved by 11%.

[0065] This specific implementation is only the best example and is not a restrictive implementation of the technical solution of the present invention.

Claims

1. A torpedo tank bottom structure capable of extending the service life of a torpedo tank, comprising a tank bottom shell, an insulation layer built within the tank bottom shell, a permanent layer, and a working layer, characterized in that: A reinforced refractory material layer is provided on the working layer, the thickness of which is at least 10% of the total thickness of the refractory material of the torpedo tank bottom, and its area is 1.4 to 2.5 times the area of ​​the torpedo tank mouth; an anti-corrosion refractory material layer is provided on the reinforced refractory material layer, the thickness of which is at least 8% of the total thickness of the refractory material of the torpedo tank bottom, and its area is 1.2 to 2.3 times the area of ​​the torpedo tank mouth, and the area of ​​the anti-corrosion refractory material layer is no more than 18% smaller than the area of ​​the reinforced refractory material layer.

2. The tank bottom structure capable of increasing the service life of a torpedo tank according to claim 1, characterized in that: The raw material composition and weight percentage content of the reinforced refractory material layer are: 35-50% of fused corundum with a particle size of 3-5 mm, 5-10% of waste mullite brick aggregate with a particle size of 1-3 mm, 3-14% of silicon carbide with a particle size of ≤0.088 mm, 10-30% of white corundum fine powder with a particle size of ≤0.088 mm, 0.01-5% of alumina micropowder with a particle size of 3-6 μm, 2.5-9% of alumina micropowder with a particle size of ≤0.088 mm, 1-5% of mesophase asphalt powder with a particle size of ≤0.088 mm, 0.1-2% of aluminum powder with a particle size of ≤0.01 mm, and 3-6% of calcium aluminate cement binder; plus 3-10% of water based on the total amount of the above raw materials.

3. A method for preparing a torpedo tank bottom structure capable of extending the service life of a torpedo tank as claimed in claim 1 or 2, characterized in that: The method for preparing the refractory material for the reinforced refractory material layer comprises the following steps: 1) Prefabricated mixture A is prepared by mixing silicon carbide, white corundum fine powder, alumina fine powder, aluminum powder, and calcium aluminate cement in proportion by weight for 5 to 25 minutes to obtain prefabricated mixture A; 2) Prefabricated mixture B is prepared by mixing fused corundum and waste mullite brick aggregate weighed in proportion by weight, and stirring for 15 to 35 minutes to obtain prefabricated mixture B; 3) Mix precast mix A and precast mix B and stir and dry mix for 10 to 30 minutes; 4) Set aside.

4. The tank bottom structure capable of increasing the service life of a torpedo tank according to claim 1, characterized in that: The raw material composition and weight percentage content of the anti-corrosion refractory material layer are: 50-65% of fused mullite aggregate with a particle size of 1-5 mm, 3-14% of andalusite with a particle size of 0.1-0.01 mm, 4-9% of alumina micropowder with a particle size of 3-6 μm, 0.5-6% of silicon nitride with a particle size of ≤0.088 mm, 3-15% of zirconium mullite fine powder with a particle size of ≤0.074 mm, 1-3% of silicone resin powder with a particle size of ≤0.088 mm, 2-5% of high-temperature modified asphalt, and 2-8% of calcium aluminate cement binder; plus 3-8% of water based on the total amount of the above raw materials.

5. A torpedo tank bottom structure capable of increasing the service life of a torpedo tank according to claim 1 or 4, characterized in that: The refractory material preparation method of the anti-corrosion refractory material layer comprises the following steps: 1) Prefabricated mixture C is prepared by mixing andalusite and calcium aluminate cement weighed in proportion by weight for 5 to 25 minutes to obtain prefabricated mixture C; 2) Prefabricated mixture D is prepared by mixing silicon nitride, fused mullite, zirconium mullite fine powder, aluminum powder, silicone resin powder and high-temperature modified asphalt in proportion by weight, and stirring for 15 to 35 minutes to obtain prefabricated mixture D; 3) Mix precast mix C and precast mix D and stir and dry mix for 10 to 30 minutes; 4) Set aside.

6. A method for manufacturing a torpedo tank bottom structure capable of extending the service life of a torpedo tank as claimed in claim 1, 3 or 5, comprising the following steps: 1) First, clean the working layer at the bottom of the torpedo tank; 2) Pour reinforced refractory materials to form a reinforced refractory layer, the thickness of which is at least 10% of the total thickness of the refractory material at the bottom of the torpedo tank, and its area is 1.4 to 2.5 times the area of ​​the torpedo tank mouth; and maintain for not less than 22 hours; 3) pouring anti-corrosion refractory material on the reinforced refractory layer to form an anti-corrosion refractory layer; providing an anti-corrosion refractory layer on the reinforced refractory layer, the thickness of which is at least 8% of the total thickness of the refractory material of the torpedo tank bottom and the area of ​​which is 1.2 to 2.3 times the area of ​​the torpedo tank mouth; 4) After curing at room temperature for 2 to 3 days, bake at a temperature of 600 to 1000°C for no less than 5 days; 5) Start the furnace.

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