Castable for tilting type aluminum smelting furnace burner

Abstract

The invention belongs to the technical field of refractory castable, and particularly relates to castable for a tilting type aluminum smelting furnace burner. The castable is prepared from the following raw materials: Al2O3 coarse aggregate, Al2O3 fine aggregate, Al2O3 powder, a reinforcing agent, Al2O3 fibers, AlN micro powder and an aluminate cement binding agent, and the reinforcing agent is a mixture of ZrO2 and Si3N4. The natural gas erosion-resistant castable at least has the beneficial effects that the castable has outstanding natural gas erosion resistance.

Description

Technical Field

[0001] The present application belongs to the technical field of refractory castables, and in particular relates to a castable for a tilting aluminum melting furnace burner. Background Art

[0002] Compared with ordinary aluminum melting furnaces, the difference in structure between the tilting aluminum melting furnace and the ordinary aluminum melting furnace is mainly reflected in the exterior of the furnace body. Generally, the tilting aluminum melting furnace is hingedly installed on the frame. After the aluminum material is smelted, it can be tilted and discharged at the original feeding port position by rotating itself, which is very convenient and efficient.

[0003] Accordingly, the castables used in tilting aluminum melting furnaces need to have not only the three basic advantages of low thermal conductivity, high temperature resistance and outstanding thermal shock resistance, but also outstanding mechanical vibration resistance to cope with the frequent and small vibrations that are unavoidable during normal rotation of such aluminum melting furnaces. Otherwise, a large number of small cracks will appear on the castable layer of the tilting aluminum melting furnace due to the mechanical vibration of the entire furnace body, which will ultimately greatly shorten the effective service life of the castable layer.

[0004] On the other hand, the castable for the burner is used above the liquid surface of the molten aluminum material, and its functions mainly include the following three: First, pour it on the inner ring surface of the burner to protect the burner itself; Second, pouring between the burner installation hole of the furnace body and the burner, sealing and filling the installation hole, and installing and fixing the burner; Third, pour it on the relatively upper part of the inner surface of the furnace body to protect the furnace body itself.

[0005] Among them, the above-mentioned burner generally refers to a natural gas burner.

[0006] In addition, the main difference between the burner castable and the main castable used in a large number of aluminum melting furnaces is that the two are used in different locations and contact materials. The former generally does not need to contact molten aluminum. Therefore, the formula and process of the burner castable need to be adjusted accordingly based on the existing main castable of aluminum melting furnaces.

[0007] For example, the Chinese invention patent application with application publication number CN118812272A and application publication date 2024.10.22 discloses a high-strength, chemical-resistant, wear-resistant and fire-resistant castable, whose raw material composition mainly includes: 50-70% silicon carbide aggregate, 5-20% corundum aggregate, 3-7% aluminate cement, 0.1-0.3% water reducer, 0.7-1.2% silica sol, 2-5% boron nitride, 2-5% aluminum nitride, and 0.3-0.8% steel fiber.

[0008] The castable in the invention patent application has the following advantages: using silicon carbide as the main aggregate in combination with corundum can effectively improve the acid and alkali corrosion resistance and thermal shock resistance of the castable.

[0009] However, when the castable is used on the burner of an aluminum furnace or near the burner, it still has at least the following performance deficiencies, specifically manifested as: When faced with working conditions above the surface of molten aluminum, this castable is unable to provide sufficient and targeted resistance to chemical corrosion, so harmful phenomena such as breakage, cracking, and peeling will occur in a relatively short period of time. Summary of the invention

[0010] The present application provides a castable for a tilting aluminum melting furnace burner, and the technical problem to be solved is: how to make the special castable have sufficient and targeted chemical corrosion resistance near the burner and above the liquid level of molten aluminum.

[0011] The technical solution adopted by the present application to solve the above-mentioned problem is: a castable for a tilting aluminum melting furnace burner, the raw material composition includes: Al2O3 coarse aggregate, Al2O3 fine aggregate, Al2O3 powder, reinforcing agent, Al2O3 fiber, AlN micropowder, and aluminate cement binder, wherein the reinforcing agent is a mixture of ZrO2 and Si3N4.

[0012] A further preferred technical solution is that the particle size of the Al2O3 coarse aggregate is 1.0-3.0 mm, the particle size of the Al2O3 fine aggregate is 0.4-0.8 mm, the particle size of the Al2O3 powder is 100-260 μm, and the particle size of the AlN fine powder is 2-12 μm.

[0013] A further preferred technical solution is that the length of the Al2O3 fiber is 0.6-1.5 cm and the wire diameter is 0.1-0.5 mm.

[0014] A further preferred technical solution is that the particle size of the reinforcing agent is ≤0.2 mm.

[0015] A further preferred technical solution is that the raw material composition includes the following components by weight: 30-34% Al2O3 coarse aggregate, 20-22% Al2O3 fine aggregate, 14-18% Al2O3 powder, 11-15% reinforcing agent, 1-2% Al2O3 fiber, 11-20% AlN fine powder, and 3-4% aluminate cement binder.

[0016] A further preferred technical solution is that in the reinforcing agent, the weight proportion of ZrO2 and Si3N4 is ≥35%.

[0017] A further preferred technical solution is that the raw material composition also includes: aminosulfonate water reducer and sodium tripolyphosphate dispersant.

[0018] A method for using a castable for a tilting aluminum melting furnace burner comprises the following steps in sequence: S1, add water to mix; S2, burner port pouring; S3, thermal sintering; S4, anti-corrosion coating, Wherein, the material of the anti-corrosion coating is Si3N4.

[0019] A further preferred technical solution is that: in S1, the amount of water added is 4.5-5.0% of the weight of the castable; in S2, the burner is poured and fixed at the burner port to ensure that the distance between the lower end of the casting layer and the liquid surface of the molten aluminum material is ≥15 cm.

[0020] A further preferred technical solution is that: in S3, the temperature of the thermal sintering is 400-950°C; in S4, the coating method of Si3N4 is flame spraying, and the thickness of the anti-corrosion coating is 0.2-0.4mm.

[0021] The applicant found that water vapor, carbon dioxide and a small amount of hydrogen sulfide gas generated during the combustion of natural gas will corrode the castable layer. The specific principles include: 1. Water vapor can react with iron oxide to generate iron hydroxide, which will decompose and volatilize in the high temperature environment of the aluminum melting furnace, thus causing material loss in the casting layer; 2. Water vapor can react with castable raw materials such as silicon carbide and graphite to generate carbon monoxide and hydrogen, causing the castable layer to be eroded; 3. Carbon dioxide can react with alkaline oxides such as magnesium oxide and calcium oxide to generate carbonates. This reaction will expand the volume of the castable layer, leading to structural cracking and peeling; 4. Hydrogen sulfide gas can react with alkaline oxides such as magnesium oxide and calcium oxide to generate sulfates or sulfites. The above-mentioned sulfates or sulfites usually have a low melting point and are easy to melt at high temperatures, resulting in structural damage to the castable layer.

[0022] Therefore, the chemical corrosion resistance required for the castables used for burners of aluminum melting furnaces does not refer to the corrosion resistance of aluminum liquid, but the corrosion resistance of natural gas. For the castables in this application, its basic advantages are: low thermal conductivity, high temperature resistance, and outstanding thermal shock resistance, its upgraded advantages are: outstanding mechanical vibration resistance, and its special advantages are: outstanding natural gas corrosion resistance.

[0023] The basic reasons why the castable in this application has the above outstanding comprehensive properties mainly include the following 7 points: First, raw materials that easily react with various gases produced during the natural gas combustion process are not used, including iron oxide, silicon carbide, graphite, magnesium oxide, and calcium oxide; Second, the main components of castable products are coarse aggregate, fine aggregate and powder. The castables in this application are all made of Al2O3, and through a reasonable particle grading method, the castable has basic density and corrosion resistance, which is one of the common foundations of the above-mentioned thermal shock resistance, mechanical vibration resistance, and natural gas corrosion resistance. Third, ZrO2 in the above-mentioned reinforcing agent has a toughening effect on Al2O3 coarse aggregate, Al2O3 fine aggregate and Al2O3 powder, which can significantly improve the thermal shock resistance and mechanical vibration resistance of the castable. One of the reasons is that ZrO2 has good toughness and phase change toughening effect, which can effectively absorb mechanical vibration energy. Fourth, Si3N4 in the above-mentioned reinforcing agent not only has high refractoriness and good oxidation resistance, but also has excellent mechanical impact resistance, which ultimately enhances the mechanical strength of the castable, corresponding to the above-mentioned mechanical vibration resistance; Fifth, Al2O3 fiber, as an excellent explosion-proof fiber, can form a three-dimensional network structure inside the castable, effectively disperse and absorb mechanical vibration energy, prevent crack expansion, improve overall toughness and impact resistance, and ultimately make the castable have outstanding thermal shock resistance and mechanical vibration resistance; Sixth, the particle size of AlN micro powder is smaller than that of Al2O3 powder, which can further improve the density of the castable, which is beneficial to the above-mentioned thermal shock resistance, mechanical vibration resistance, and natural gas erosion resistance; Seventh, the Si3N4 anti-corrosion coating can effectively prevent the surface of the castable layer from being damaged by mechanical wear and impact, which is beneficial to the castable's resistance to mechanical vibration and natural gas erosion.

[0024] The castable in this application has the above outstanding comprehensive performances due to the following three reasons: First, the whole of Al2O3 coarse aggregate, Al2O3 fine aggregate and Al2O3 powder, Al2O3 fiber, Si3N4 reinforcing agent and Si3N4 anti-corrosion coating all have the characteristics of "similar compatibility" between the same raw materials. This feature may not be obvious under low temperature conditions, but it is very important and significant in the high temperature environment of aluminum melting furnace. The degree of combination between raw materials is higher, and the physical and chemical properties are more similar, which is helpful for the thermal shock resistance, mechanical vibration resistance and natural gas corrosion resistance of castables. Second, like the raw material of Al2O3 coarse aggregate, Al2O3 fine aggregate and Al2O3 powder as a whole, all other raw materials used do not include, at least not in large quantities, the above-mentioned iron oxide, silicon carbide, graphite, magnesium oxide, and calcium oxide that actively react with natural gas combustion gas, which further improves the natural gas erosion resistance of the castable in the present application; Third, the castable in the present application is an alumina castable, which has basic and comprehensive low thermal conductivity and high temperature resistance, and fully meets the installation and use requirements of aluminum melting furnace burners.

[0025] The beneficial effects of this application include at least the following three points.

[0026] First, the castable used for the burner of the tilting aluminum melting furnace has outstanding low thermal conductivity, high temperature resistance and thermal shock resistance. The specific parameters are: thermal conductivity at 800°C is ≤1.4W / (m·K), high temperature resistance is ≥1640°C, and thermal shock resistance is ≥28 times.

[0027] Second, the castable has outstanding resistance to mechanical vibration. The specific parameters are: compressive strength ≥185MPa (1100℃×3h), flexural strength ≥40MPa (1100℃×3h).

[0028] Third, the castable has outstanding resistance to natural gas erosion. The specific result is: the castable is used at the natural gas burner position of the 120-ton tilting melting furnace of Shunbo Alloy Anhui Co., Ltd., which can ensure that there will be no obvious cracking and peeling of the castable layer during 240 days of continuous smelting. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a table of average results of castable performance tests in 4 embodiments and 6 comparative examples of the present application.

[0030] Figure 2 This is a schematic diagram of the use position of the castable in this application.

[0031] Figure 3 This is a photo of the position and shape of the castable in the burner in this application.

[0032] Figure 4 These are photos of cracking and / or peeling of the burner castable layer in Comparative Example 6 of the present application.

[0033] In the figure, the meanings of the symbols are as follows.

[0034] Burner a, furnace body b, inlet and outlet cover plate c, burner installation hole d, burner special casting material layer e, main body casting material layer f, rotating shaft g, hinged plate h, liquid level position k. DETAILED DESCRIPTION

[0035] The following description is merely a preferred embodiment of the present application and does not limit the scope of the present application.

[0036] Example 1 like Figure 1-3 As shown, a castable for a tilting aluminum melting furnace burner, the raw material composition of which is the following components by weight: Al2O3 coarse aggregate 34%, Al2O3 fine aggregate 20%, Al2O3 powder 15%, reinforcing agent 12%, Al2O3 fiber 1%, AlN micropowder 14.5%, aluminate cement binder 3%, and aminosulfonate water reducer and sodium tripolyphosphate dispersant totaling 0.5%.

[0037] Wherein, the particle size of the Al2O3 coarse aggregate is 1.0-2.2 mm, the particle size of the Al2O3 fine aggregate is 0.3-0.7 mm, the particle size of the Al2O3 powder is 115-187 μm, and the particle size of the AlN micro powder is 7-12 μm.

[0038] The length of the Al2O3 fiber is 0.6-1.4 cm, and the wire diameter is 0.1-0.5 mm.

[0039] The reinforcing agent is a mixture of ZrO2 and Si3N4, the particle sizes of both are ≤0.2 mm, and the weight of each of them accounts for ≥35% of the total weight of the two.

[0040] The preparation method of the casting material is as follows: all the above raw materials are added in a mixer in proportion, and the mixture is fully stirred and evenly mixed to obtain the casting material. The casting material product is packed in bags.

[0041] The method for using the castable comprises the following steps in sequence: S1, add water to mix; S2, burner port pouring; S3, thermal sintering; S4, anti-corrosion coating, Wherein, the material of the anti-corrosion coating is Si3N4.

[0042] In S1, the amount of water added is 4.6% of the weight of the castable; in S2, the burner is poured and fixed at the burner port to ensure that the distance between the lower end of the casting layer and the liquid surface of the molten aluminum material is ≥15 cm.

[0043] In S3, the thermal sintering temperature is 470°C; in S4, the coating method of Si3N4 is flame spraying, and the thickness of the anti-corrosion coating is 0.4 mm.

[0044] Example 2 like Figure 1-3 As shown, a castable for a tilting aluminum melting furnace burner, the raw material composition of which is the following components by weight: Al2O3 coarse aggregate 33%, Al2O3 fine aggregate 20%, Al2O3 powder 14%, reinforcing agent 12%, Al2O3 fiber 2%, AlN micro powder 15%, and aluminate cement binder 4%.

[0045] The particle size of the Al2O3 coarse aggregate is 1.0-2.6 mm, the particle size of the Al2O3 fine aggregate is 0.3-0.7 mm, the particle size of the Al2O3 powder is 115-187 μm, and the particle size of the AlN micro powder is 7-12 μm.

[0046] The length of the Al2O3 fiber is 0.7-1.4 cm, and the wire diameter is 0.2-0.5 mm.

[0047] The reinforcing agent is a mixture of ZrO2 and Si3N4, the particle sizes of both are ≤0.2 mm, and the weight of each of them accounts for ≥35% of the total weight of the two.

[0048] The preparation method of the casting material is as follows: all the above raw materials are added in a mixer in proportion, and the mixture is fully stirred and evenly mixed to obtain the casting material. The casting material product is packed in bags.

[0049] The method for using the castable comprises the following steps in sequence: S1, add water to mix; S2, burner port pouring; S3, thermal sintering; S4, anti-corrosion coating, Wherein, the material of the anti-corrosion coating is Si3N4.

[0050] In S1, the amount of water added is 4.7% of the weight of the castable; in S2, the burner is poured and fixed at the burner port to ensure that the distance between the lower end of the casting layer and the liquid surface of the molten aluminum material is ≥15 cm.

[0051] In S3, the thermal sintering temperature is 530°C; in S4, the coating method of Si3N4 is flame spraying, and the thickness of the anti-corrosion coating is 0.4 mm.

[0052] Example 3 like Figure 1-3 As shown, a castable for a tilting aluminum melting furnace burner, the raw material composition of which is the following components by weight: Al2O3 coarse aggregate 34%, Al2O3 fine aggregate 21%, Al2O3 powder 15%, reinforcing agent 12%, Al2O3 fiber 1%, AlN micropowder 13.5%, aluminate cement binder 3%, and aminosulfonate water reducer and sodium tripolyphosphate dispersant totaling 0.5%.

[0053] Wherein, the particle size of the Al2O3 coarse aggregate is 1.5-2.5 mm, the particle size of the Al2O3 fine aggregate is 0.3-0.6 mm, the particle size of the Al2O3 powder is 120-185 μm, and the particle size of the AlN micro powder is 5-11 μm.

[0054] The length of the Al2O3 fiber is 0.6-1.4 cm, and the wire diameter is 0.1-0.5 mm.

[0055] The reinforcing agent is a mixture of ZrO2 and Si3N4, the particle sizes of both are ≤0.2 mm, and the weight of each of them accounts for ≥35% of the total weight of the two.

[0056] The preparation method of the casting material is as follows: all the above raw materials are added in a mixer in proportion, and the mixture is fully stirred and evenly mixed to obtain the casting material. The casting material product is packed in bags.

[0057] The method for using the castable comprises the following steps in sequence: S1, add water to mix; S2, burner port pouring; S3, thermal sintering; S4, anti-corrosion coating, Wherein, the material of the anti-corrosion coating is Si3N4.

[0058] In S1, the amount of water added is 4.9% of the weight of the castable; in S2, the burner is poured and fixed at the burner port to ensure that the distance between the lower end of the casting layer and the liquid surface of the molten aluminum material is ≥15 cm.

[0059] In S3, the thermal sintering temperature is 660°C; in S4, the coating method of Si3N4 is flame spraying, and the thickness of the anti-corrosion coating is 0.4 mm.

[0060] Example 4 like Figure 1-3 As shown, a castable for a tilting aluminum melting furnace burner, the raw material composition of which is the following components by weight: Al2O3 coarse aggregate 32%, Al2O3 fine aggregate 21%, Al2O3 powder 15%, reinforcing agent 11%, Al2O3 fiber 2%, AlN micro powder 15%, and aluminate cement binder 4%.

[0061] The particle size of the Al2O3 coarse aggregate is 1.1-2.4 mm, the particle size of the Al2O3 fine aggregate is 0.4-0.7 mm, the particle size of the Al2O3 powder is 180-225 μm, and the particle size of the AlN micro powder is 4.5-12 μm.

[0062] The length of the Al2O3 fiber is 0.7-1.4 cm, and the wire diameter is 0.2-0.5 mm.

[0063] The reinforcing agent is a mixture of ZrO2 and Si3N4, the particle sizes of both are ≤0.2 mm, and the weight of each of them accounts for ≥35% of the total weight of the two.

[0064] The preparation method of the casting material is as follows: all the above raw materials are added in a mixer in proportion, and the mixture is fully stirred and evenly mixed to obtain the casting material. The casting material product is packed in bags.

[0065] The method for using the castable comprises the following steps in sequence: S1, add water to mix; S2, burner port pouring; S3, thermal sintering; S4, anti-corrosion coating, Wherein, the material of the anti-corrosion coating is Si3N4.

[0066] In S1, the amount of water added is 5.0% of the weight of the castable; in S2, the burner is poured and fixed at the burner port to ensure that the distance between the lower end of the casting layer and the liquid surface of the molten aluminum material is ≥15 cm.

[0067] In S3, the thermal sintering temperature is 700°C; in S4, the coating method of Si3N4 is flame spraying, and the thickness of the anti-corrosion coating is 0.4 mm.

[0068] Comparative Example 1 The special castable for the burner of the tilting aluminum melting furnace in this comparative example, and the preparation and use method thereof, are different from those in Example 1 in the following two points: First, remove the enhancer and do not use it; Second, the step of "anti-corrosion coating" is omitted, that is, the casting material layer in this comparative example does not include Si3N4 coating.

[0069] Comparative Example 2 The special castable for the burner of the tilting aluminum melting furnace in this comparative example, and the preparation and use method thereof, are different from those in Example 1 in the following two points: First, remove the Al2O3 fiber and do not use it; Second, take out the AlN powder and dispose of it.

[0070] Comparative Example 3 The special castable for the burner of the tilting aluminum melting furnace in this comparative example, and the preparation and use method thereof, are different from those in Example 1 in the following three points: First, Al2O3 coarse aggregate, Al2O3 fine aggregate and Al2O3 powder are replaced with existing silicon carbide coarse aggregate, corundum fine aggregate and mullite powder respectively; Second, remove the enhancer and do not use it; Third, remove the Al2O3 fiber and dispose of it.

[0071] Comparative Example 4 The special castable for the burner of the tilting aluminum melting furnace in this comparative example, and the preparation and use method thereof, are different from those in Example 1 in the following three points: First, Al2O3 coarse aggregate, Al2O3 fine aggregate and Al2O3 powder are replaced with existing silicon carbide coarse aggregate, corundum fine aggregate and mullite powder respectively; Second, take out the AlN powder and discard it; Third, the step of "anti-corrosion coating" is omitted, that is, the casting material layer in this comparative example does not include Si3N4 coating.

[0072] Comparative Example 5 The special castable for the burner of the tilting aluminum melting furnace in this comparative example, and the preparation and use method thereof, are different from those in Example 1 in the following four points only; First, remove the enhancer and do not use it; Second, remove the Al2O3 fiber and do not use it; Third, take out the AlN powder; Fourth, the step of "anti-corrosion coating" is omitted, that is, the castable layer in this comparative example does not include Si3N4 coating.

[0073] Comparative Example 6 The special castable for the burner of the tilting aluminum melting furnace in this comparative example, and the preparation and use method thereof, are different from those in Example 1 in the following four points only; First, Al2O3 coarse aggregate, Al2O3 fine aggregate and Al2O3 powder are replaced with existing silicon carbide coarse aggregate, corundum fine aggregate and mullite powder respectively; Second, remove the enhancer and do not use it; Third, remove the Al2O3 fiber and do not use it; Fourth, replace the Si3N4 coating with SiC coating.

[0074] Performance Test 1 In the above 4 embodiments and 6 comparative examples, 10 samples were taken respectively and subjected to the following Figure 1Performance tests of the items shown, average results are attached Figure 1 .

[0075] Among them, the testing standard for thermal conductivity refers to GB / T 10294-2008, the testing standard for high temperature resistance refers to ISO5013:2014, the testing standard for thermal shock resistance refers to GB / T 3006-2006, and the testing standard for mechanical vibration resistance refers to GB / T 18301-2012.

[0076] Performance Test 2 Shunbo Alloy Anhui Co., Ltd. has 10 120-ton tilting melting furnaces, corresponding to 10 burner castable layer areas, and uses the above 10 castables for casting and molding. Finally, after 240 days of normal use of the aluminum melting furnace, obvious natural gas erosion occurred in the castable layer areas corresponding to multiple comparison examples.

[0077] Specifically, as attached Figure 4 As shown, it shows the natural gas erosion phenomenon in the casting layer area corresponding to Example 6, which is mainly manifested as cracking of the casting layer and secondarily as peeling of the casting layer.

[0078] Performance Analysis The castables in the first and fourth embodiments have basic low thermal conductivity, high temperature resistance, thermal shock resistance, upgraded mechanical vibration resistance, and ultimate natural gas erosion resistance, and can meet various usage requirements of the tilting aluminum melting furnace burner.

[0079] Second, the castables in the six comparative examples all have more or less deficiencies in the above-mentioned performances, which indicates that the castables in the embodiments have the above-mentioned combined advantages through the synergistic effect of the overall solution, and also indicate that the differences in all comparative examples are indispensable to the embodiments.

[0080] The above detailed description of the implementation methods of the present application is made in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present application. These are all non-creative modifications and are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A castable for a tilting aluminum melting furnace burner, characterized in that The raw material composition includes: Al2O3 coarse aggregate, Al2O3 fine aggregate, Al2O3 powder, reinforcing agent, Al2O3 fiber, AlN micro powder, and aluminate cement binder, wherein the reinforcing agent is a mixture of ZrO2 and Si3N4.

2. The castable material for a tilting aluminum melting furnace burner according to claim 1, characterized in that: The particle size of the Al2O3 coarse aggregate is 1.0-3.0 mm, the particle size of the Al2O3 fine aggregate is 0.4-0.8 mm, the particle size of the Al2O3 powder is 100-260 μm, and the particle size of the AlN micro powder is 2-12 μm.

3. The castable material for a tilting aluminum melting furnace burner according to claim 1, characterized in that: The length of the Al2O3 fiber is 0.6-1.5 cm, and the wire diameter is 0.1-0.5 mm.

4. The castable material for a tilting aluminum melting furnace burner according to claim 1, characterized in that: The particle size of the reinforcing agent is ≤0.2 mm.

5. The castable material for a tilting aluminum melting furnace burner according to claim 1, characterized in that The raw material composition includes the following components by weight: 30-34% Al2O3 coarse aggregate, 20-22% Al2O3 fine aggregate, 14-18% Al2O3 powder, 11-15% reinforcing agent, 1-2% Al2O3 fiber, 11-20% AlN fine powder, and 3-4% aluminate cement binder.

6. The castable material for a tilting aluminum melting furnace burner according to claim 5, characterized in that: In the reinforcing agent, the weight proportion of ZrO2 and Si3N4 is ≥35%.

7. The castable material for a tilting aluminum melting furnace burner according to claim 5, characterized in that The raw material composition also includes: aminosulfonate water reducer and sodium tripolyphosphate dispersant.

8. A method for using the castable for a tilting aluminum melting furnace burner as claimed in claim 1, characterized in that The following steps are included in sequence: S1, add water to mix; S2, burner port pouring; S3, thermal sintering; S4, anti-corrosion coating, Wherein, the material of the anti-corrosion coating is Si3N4.

9. The method for using a castable for a tilting aluminum melting furnace burner according to claim 8, characterized in that: In S1, the amount of water added is 4.5-5.0% of the weight of the castable; in S2, the burner is poured and fixed at the burner port to ensure that the distance between the lower end of the casting layer and the liquid surface of the molten aluminum material is ≥15 cm.

10. The method for using a castable for a tilting aluminum melting furnace burner according to claim 8, characterized in that: In S3, the temperature of the thermal sintering is 400-950°C; in S4, the coating method of Si3N4 is flame spraying, and the thickness of the anti-corrosion coating is 0.2-0.4 mm.

Images