Exothermic and insulated riser as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of casting, and particularly relates to an exothermic and insulated riser and a preparation method and application thereof. The hollow aluminum oxide is used for replacing part of or all of floating beads or calcined aluminum oxide in the existing exothermic and insulated riser aggregate, so that the thermal insulation property or compressive strength of the riser can be accurately controlled and improved under the condition of not influencing other properties, and as the highest use temperature of the hollow aluminum oxide is 1800 DEG C, the service life of the hollow aluminum oxide is greatly prolonged. And meanwhile, due to the hollow structure, the volume density is lower, the product is lighter, the labor intensity is reduced, and the energy consumption in the production, storage and transportation processes is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of casting, and in particular relates to a heat-insulating riser and a preparation method and application thereof. Background Art

[0002] The heat-insulating riser sleeve for casting refers to the supplementary part attached to the top or side of the casting to avoid defects in the casting. Function In the casting mold, the cavity of the riser is the cavity for storing liquid metal. It supplies metal when the casting is formed, and has the functions of preventing shrinkage, shrinkage, exhaust and slag collection. The main function of the riser is to compensate for shrinkage.

[0003] The shrinkage compensation principle is to compensate for the liquid shrinkage of the molten metal in the mold cavity and the shrinkage of the casting during solidification to obtain a dense casting without shrinkage cavities. When the casting is cooled in the mold, the thinnest part solidifies first, and its shrinkage can be compensated by the thicker part nearby; when the thicker part solidifies, it can be compensated by the thickest part; when the thickest part solidifies, if there is no external compensation, a large shrinkage cavity will be formed there. In this case, the role of the riser is to compensate for the last part of the casting to solidify, so it should be placed above or on the side of the thickest part of the casting, and its solidification is required to be later than the thickest part of the casting.

[0004] The riser made of insulation material is called a heat-generating insulation riser. The solidification time of the molten metal in the heat-generating insulation riser is longer than that of the ordinary riser, which saves metal. In the traditional heat-generating insulation riser, floating beads are used as insulation materials, aluminum powder is used as a heat-generating agent, and calcined alumina is used as a structural strength filler, which is also a refractory material.

[0005] Among them, floating beads are hollow fly ash balls that can float on the water. They are off-white in color, thin-walled and hollow, very light in weight, with a bulk density of 720kg / m 3 (Heavy), 418.8kg / m 3 (Lightweight), particle size is about 0.1 mm, surface is closed and smooth, thermal conductivity is small, refractoriness is ≥1610℃, it is an excellent thermal insulation refractory material, widely used in the production of lightweight castables and oil drilling. The chemical composition of the floating beads is mainly silicon dioxide and aluminum oxide, and the thermal conductivity is 0.08-0.1W / (m·K).

[0006] Calcined alumina is a type of aluminum oxide obtained by calcining aluminum hydroxide or industrial alumina at 1200-1700℃. Calcined alumina has a high melting point, hardness and wear resistance, as well as good chemical stability and insulation properties. The crystal form is trigonal, with a relative molecular mass of 101.96. It is mainly α-Al2O3, with stable physical and chemical properties and a white powder appearance. The melting point is 2050℃, the boiling point is 2980℃, and the linear expansion coefficient is 8.6×10 -6 / ℃, the thermal conductivity of calcined alumina is very high, usually between 20 and 30W / (m·K). α-Al2O3 has small specific surface area, uniform particle size, easy dispersion, high hardness (Mohs hardness is 9.0), low water absorption (≤2.5%),

[0007] Generally speaking, the heat-insulating riser needs to have sufficient compressive strength while taking into account the thermal insulation ability to ensure the stability of the riser in the casting scenario. The floating beads have good thermal insulation performance but insufficient hardness, and the calcined alumina has strong hardness but high thermal conductivity. Generally speaking, the existing technology generally chooses to adjust the ratio of floating beads and calcined alumina to meet the needs of different scenarios, but it will inevitably sacrifice some of the thermal insulation ability or compressive strength.

[0008] Therefore, it is necessary to find a new replacement form that will not affect the compressive strength of the riser while taking into account or even improving the thermal insulation performance of the riser. Summary of the invention

[0009] In order to solve at least one of the above problems, the present invention proposes a heat-generating and heat-insulating riser, the aggregate of which comprises: heat-insulating material, structural strength filler, aluminum powder, aluminum chips, potassium fluoroaluminate,

[0010] Wherein, the thermal insulation material and the structural strength filler both include hollow alumina microspheres.

[0011] By replacing part or all of the floating beads or calcined alumina in the existing heat-generating and thermal-insulating riser aggregates with hollow alumina, the inventors can precisely control and improve the thermal insulation performance or compressive strength of the riser without affecting other properties, thereby meeting the needs of different scenarios.

[0012] According to a specific embodiment of the present invention, the aggregate of the heat-generating and heat-insulating riser includes, by weight: 400-450 parts of heat-insulating material, 300-350 parts of structural strength filler, 500-600 parts of aluminum powder, 55-75 parts of aluminum chips, and 45-55 parts of potassium fluoroaluminate.

[0013] According to a specific embodiment of the present invention, the thermal insulation material further includes floating beads.

[0014] According to a specific embodiment of the present invention, in the thermal insulation material, the floating beads and the hollow alumina microspheres are mixed in any proportion, and the greater the proportion of the hollow alumina microspheres, the stronger the compressive resistance of the heat-generating and thermal insulation riser.

[0015] According to a specific embodiment of the present invention, the structural strength material further comprises calcined alumina.

[0016] According to a specific embodiment of the present invention, in the structural strength material, the calcined alumina and the alumina hollow microspheres are mixed in any proportion, and the greater the proportion of the alumina hollow microspheres, the longer the insulation time of the heat-generating and heat-insulating riser.

[0017] By replacing part or all of the floating beads or calcined alumina in the existing heat-generating and thermal-insulating riser aggregates with hollow alumina, the inventors can precisely control and improve the thermal insulation performance or compressive strength of the riser without affecting other properties, thereby meeting the needs of different scenarios.

[0018] According to a specific embodiment of the present invention, in the heat-insulating riser, the mass ratio of the floating beads, alumina hollow microspheres, and calcined alumina is (130-140): (445-455): (110-120), preferably 135:450:115, the heat-insulating time and compressive strength of the heat-insulating riser can reach an optimal balance.

[0019] According to a specific embodiment of the present invention, in the heat-insulating riser, the mass ratio of the floating beads, alumina hollow microspheres, calcined alumina, aluminum powder, aluminum chips, and potassium fluoroaluminate is (130-140):(445-455):(110-120):(490-510):(50-60):(40-50), preferably 135:450:115:500:55:45, the heat-insulating time and compressive strength of the heat-insulating riser can reach an optimal balance.

[0020] According to a specific embodiment of the present invention, the inner diameter of the hollow alumina microspheres is 0.2-1 mm.

[0021] The second aspect of the present invention provides a method for preparing the heat-generating and heat-insulating riser according to the first aspect, comprising the following steps:

[0022] S1, partially or completely replacing the floating beads and / or calcined alumina in the aggregate of the original heat-insulating riser with hollow alumina microspheres, and mixing with the remaining aggregates in the original heat-insulating riser to obtain riser aggregate 1;

[0023] S2, mixing the riser aggregate 1 with the cold box resin component 1 and the component 2 in sequence to obtain a riser premix;

[0024] S3, placing the riser premix into a core shooting machine, and preparing the heat-generating and heat-insulating riser by a core shooting process,

[0025] in,

[0026] In parts by weight, the aggregate of the original heating and heat-insulating riser includes 400-450 parts of floating beads, 300-350 parts of calcined alumina, 500-600 parts of aluminum powder, 55-75 parts of aluminum chips, and 45-55 parts of potassium fluoroaluminate.

[0027] The present invention adopts hollow alumina balls to replace part or all of the calcined alumina in the heating and insulating riser sleeve for casting (core shooting process), forming a new core shooting riser production process, which can reduce the thermal conductivity, extend the riser insulation time (by replacing the calcined alumina with different mass proportions, the insulation time can be further controlled to meet the needs of different scenarios), and improve the insulation effect without increasing the gas emission of the product and affecting the basic structure strength. At the same time, it can reduce the weight of the product, thereby reducing the transportation and storage costs, and is suitable for industrial production and application.

[0028] The present invention adopts alumina hollow balls to replace part or all of the floating beads in the heating and insulation riser sleeve (core shooting process) for casting, forming a new core shooting riser production process. Without significantly affecting other properties, the compressive strength of the riser can be further improved to meet different industrial needs.

[0029] According to a specific embodiment of the present invention, the inner diameter of the hollow alumina microspheres is 0.2-1 mm.

[0030] According to a specific embodiment of the present invention, the mass ratio of the riser aggregate 1 to the cold box resin component 1 and component 2 is 1:(60-70):(60-70).

[0031] Compared with the prior art, the present invention has the following beneficial effects: the use of 0.2-1mm spherical grade alumina hollow balls has a lower thermal conductivity than calcined alumina, which can provide better thermal insulation effect. At the same time, due to its maximum use temperature of 1800°C, it can meet the use of most cast iron and steel castings in hot environments. At the same time, due to its hollow structure, the volume density is lower, the product is lighter, and the labor intensity and energy consumption in the production, storage and transportation process are reduced. In addition, the alumina hollow balls themselves are stable in high temperature environments, and replacement has little effect on the gas emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a test curve of the insulation time of the AL60-90 type riser prepared in Example 1 of the present application;

[0034] Figure 2 This is a test curve of the insulation time of the AL60-90 type riser prepared in Example 2 of the present application;

[0035] Figure 3 This is a test curve of the insulation time of the A50-80 type riser prepared in Example 1 of the present application;

[0036] Figure 4 This is a test curve of the insulation time of the A50-80 type riser prepared in Example 2 of the present application;

[0037] Figure 5 This is a test curve of the insulation time of the A70-90 model riser prepared in Example 1 of the present application;

[0038] Figure 6 This is a test curve chart of the insulation time of the A70-90 model riser prepared in Example 2 of the present application. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0040] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Further, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0041] In this document, the terms “contain”, “include” or “comprise” are open expressions, that is, they include the contents specified in the present invention but do not exclude other contents.

[0042] As used herein, the terms "optionally", "optional" or "optionally" generally mean that the subsequently described event or circumstance may but need not occur, and that the description includes instances where the event or circumstance occurs and instances where it does not.

[0043] The present invention uses 0.2-1mm spherical grade alumina hollow balls, which have a lower thermal conductivity than calcined alumina and can provide better thermal insulation effect. At the same time, due to its maximum use temperature of 1800°C, it can meet the use of most cast iron and steel castings in hot environments. At the same time, its hollow structure has a lower volume density and a lighter product, which reduces labor intensity and energy consumption during production, storage and transportation. In addition, the alumina hollow balls themselves are stable in high temperature environments, and replacement has little effect on the gas emission.

[0044] Alumina hollow sphere is a new type of high-temperature insulation material, which is made of industrial alumina by melting and blowing in an electric furnace. The crystal form is a-Al2O3 microcrystal. With alumina hollow sphere as the main body, it can be made into products of various shapes, with a maximum use temperature of 1800℃. The products have high mechanical strength, which is several times that of general lightweight products, and the volume density is only half of that of corundum products. The density of alumina hollow sphere is 2.3~2.5g / cm 3 The specific heat capacity is about 0.72 kJ / (kg·K), so it can be estimated that its thermal conductivity is generally between 0.05 and 0.2 W / m·K.

[0045] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention provides drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and advantages of the present invention.

[0046] It should be noted that, when preparing risers, those skilled in the art will first mix the riser aggregates evenly according to a specific mass ratio, and then fill them into riser molds of different sizes. Generally speaking, the mixed riser aggregates can be used to prepare n risers. Since the riser molds of the same size are fixed, the volume of the riser aggregates that can be filled is also fixed. Within unit volume, the density of the filled riser aggregates is smaller, the more risers are prepared, and the lighter the average mass of the risers is.

[0047] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] Step 1: Take 800g of floating beads, 600g of 0.2-1mm spherical grade alumina hollow microspheres, 1000g of aluminum powder, 110g of aluminum chips, and 90g of potassium fluoroaluminate, mix and stir to form a riser aggregate;

[0050] Step 2: Mix the riser aggregate with 130 g of a conventional cold box resin 1 (purchased from Suzhou Xingye Materials Co., Ltd.), and then mix it with 130 g of a cold box resin 2 (purchased from Suzhou Xingye Materials Co., Ltd.) to obtain a riser premix;

[0051] Step 3: Place the riser premix into a core shooting machine for sand shooting, and then introduce triethylamine gas in an amount of 0.8-1.2 g / k for catalytic curing and molding to prepare a heat-generating and heat-insulating riser finished product.

[0052] Comparative Example 1

[0053] Compared with Example 1, the difference is that in step 1, the 0.2-1 mm spherical grade alumina hollow spheres are replaced with calcined alumina of the same mass fraction.

[0054] Based on the riser aggregates of Example 1 and Comparative Example 1, three risers of different sizes (AL60-90: inner diameter 60 mm, height 90 mm; A50-80: inner diameter 50 mm, height 80 mm; A70-100: inner diameter 70 mm, height 1000 mm) were prepared, and the prepared risers were tested for performance, and the maximum temperature, holding time, instantaneous compressive strength KN, gas evolution and average weight were tested respectively. The results are shown in Table 1:

[0055] Table 1

[0056]

[0057] Foundry companies have various demands for heat-insulating risers for casting. Among them, special attention is paid to the requirements for insulation time while ensuring compressive strength and gas generation.

[0058] In terms of compressive strength, the inventors used the ZOZEN test machine in accordance with the JBT 13040-2017 industry standard for heat-insulating riser sleeves for casting. Among the three types of risers, only the compressive strength of A50-80 decreased slightly, with a decrease of 5.5%, which is basically within the error range. The other two types of risers showed an increase in strength, but the increases were 6.8% and 2.7% respectively, which were basically within the error range. The three sets of data were all above the industry standard, indicating that the riser using hollow alumina balls to replace calcined alumina has a slight increase in strength, and the strength does not fail to meet the standard. This process can reduce the amount of calcined alumina. Due to the hollow structure of hollow alumina balls, the density is small, the volume is large, and the weight is reduced to varying degrees. According to three sets of experiments, the weight is reduced by an average of 10.3%.

[0059] In terms of gas emission, the inventors used the GET-Ⅲ intelligent gas emission detector to detect the gas emission of three types of risers. It can be seen from Table 1 that there is no obvious change in the gas emission of the risers when the conventional calcined alumina is replaced by hollow alumina balls, and the gas emission is within the error range. Therefore, replacing calcined alumina with hollow alumina balls will not cause an increase in the gas emission of the risers and affect their use.

[0060] In terms of the holding time, the inventors used a combustion experiment, transmitted data through a temperature sensor and automatically updated the experimental data. The holding time was based on the industry standard of the time from reaching 1150°C to the highest point and then falling back to 1150°C. The results are as follows: Figure 1-6 As shown, after testing three groups of different types of risers, the insulation time is positively improved, AL60-90, A50-80, A70-100 increased by 36%, 17% and 42.2% respectively. It can be seen that improving the insulation effect by using hollow alumina balls has obvious effects in the field of heating and insulation risers for casting.

[0061] The present invention adopts hollow alumina balls to replace part or all of the calcined alumina in the heat-insulating riser sleeve (core-shooting process) for casting, forming a new core-shooting riser production process, which can reduce the thermal conductivity and extend the riser insulation time (by replacing the calcined alumina with different mass proportions, the insulation time can be further controlled to meet the needs of different scenarios). The design of the riser for the casting customer scenario is to realize the shrinkage compensation function, and risers of different sizes, shapes, different calorific values, and different insulation times will be set at different positions. At the same time, it is necessary to ensure that there is sufficient strength to ensure that the riser structure is not significantly damaged in the above situation, and the requirements for insulation time and structural strength are all improved. Improve the insulation effect without increasing the gas emission of the product and without affecting the basic structure strength, and at the same time can reduce the weight of the product, thereby reducing the transportation and storage costs, which is suitable for industrial production and application.

[0062] Comparative Example 2

[0063] Compared with Example 1, the difference is that in step 1, the floating beads are replaced with 0.2-1 mm spherical grade alumina hollow microspheres of equal mass.

[0064] The inventor further prepared the riser aggregate provided in Comparative Example 2 into three different sizes (AL60-90: inner diameter 60 mm, height 90 mm; A50-80: inner diameter 50 mm, height 80 mm; A70-100: inner diameter 70 mm, height 1000 mm) according to the method of Example 1 and Comparative Example 1, and performed performance tests on the prepared risers, respectively testing the maximum temperature, holding time, instantaneous compressive strength KN, gas evolution and average weight, and compared the performance of the different types of risers prepared in Example 1. The results are shown in Table 2:

[0065] Table 2

[0066]

[0067] The heat-insulating riser for casting has high requirements for the compressive strength of the riser in different usage scenarios. The inventor replaced the floating beads with hollow alumina balls, which can greatly improve the hardness of the riser without significantly affecting other properties. It is suitable for scenarios with high requirements for the compressive strength of the heat-insulating riser. For example, during the casting process, the riser position needs to be insulated and bear a large weight of molten iron to prevent collapse, rupture, and molten iron overflow, which requires high strength requirements.

[0068] In this embodiment, the floating beads are replaced by hollow alumina. Although a single hollow alumina is heavier than a single floating bead, because the volume of the floating beads is smaller, the number of floating beads filled per unit volume is much larger than the number of hollow alumina. Therefore, the measured average weight of the riser containing floating beads is higher than the average weight of the riser after replacing it with hollow alumina.

[0069] Example 2

[0070] Step 1: By adjusting the mass ratio of floating beads, calcined alumina, and hollow alumina microspheres, 5 experimental groups were set up, namely:

[0071] Experimental group 1: 270g of floating beads, 900g of 0.2-1mm spherical grade alumina hollow microspheres, 230g of calcined alumina, 1000g of aluminum powder, 110g of aluminum chips, and 90g of potassium fluoroaluminate were mixed and stirred to form a riser aggregate;

[0072] Experimental group 2: 130g of floating beads, 430g of 0.2-1mm spherical grade alumina hollow microspheres, 840g of calcined alumina, 1000g of aluminum powder, 110g of aluminum chips, 90g of potassium fluoroaluminate, mixed and stirred to form a riser aggregate;

[0073] Experimental group 3: 900g of floating beads, 70g of 0.2-1mm spherical grade alumina hollow microspheres, 430g, 1000g of calcined alumina, 110g of aluminum chips, and 90g of potassium fluoroaluminate were mixed and stirred to form a riser aggregate;

[0074] Experimental group 4: 700 g of floating beads, 700 g of 0.2-1 mm spherical grade alumina hollow microspheres, 1000 g of aluminum powder, 110 g of aluminum chips, and 90 g of potassium fluoroaluminate were mixed and stirred to form a riser aggregate;

[0075] Experimental group 5: 700 g of 0.2-1 mm spherical alumina hollow microspheres, 700 g of calcined alumina, 1000 g of aluminum powder, 110 g of aluminum chips, and 90 g of potassium fluoroaluminate were mixed and stirred to form a riser aggregate;

[0076] Step 2: Mix the riser aggregate with 130 g of the conventional cold box resin 1 component, and then mix it with 130 g of the cold box resin 2 component to obtain five kinds of riser premixes;

[0077] Step 3: Place the riser premix into a core shooting machine for sand shooting, and then introduce triethylamine gas in an amount of 0.8-1.2 g / k for catalytic curing and molding to prepare a heat-generating and heat-insulating riser finished product.

[0078] Based on the riser aggregates of experimental groups 1-5, three risers of different sizes (AL60-90: inner diameter 60mm, height 90mm; A50-80: inner diameter 50mm, height 80mm; A70-100: inner diameter 70mm, height 1000mm) were prepared, and the prepared risers were tested for performance. The maximum temperature, holding time, instantaneous compressive strength KN, gas evolution and average weight were tested respectively to screen the riser aggregate ratio with the most balanced riser performance. The results are shown in Table 3:

[0079] Table 3

[0080]

[0081] The inventors speculate that although completely replacing calcined alumina with hollow alumina microspheres can significantly increase the insulation time of the heating and thermal insulation riser, since both the floating beads and the hollow alumina microspheres are spherical structures, there will be gaps on the contact surface. If an appropriate amount of calcined alumina is filled in the gaps, the thermal insulation performance of the heating and thermal insulation riser will be further improved. In this embodiment, after a lot of exploration, the inventors found that when the mass ratio of floating beads, hollow alumina microspheres, and alumina in the riser aggregate is 135:450:115, as shown in Experimental Group 1, the obtained heating and thermal insulation riser has the longest insulation time and the most balanced performance while ensuring compressive strength and gas generation.

[0082] In summary, the inventors can accurately control and improve the thermal insulation performance or compressive strength of the riser by replacing part or all of the floating beads or calcined alumina in the existing heat-generating and thermal-insulating riser aggregates with hollow alumina to meet the needs of different scenarios.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat-generating and heat-insulating riser, characterized in that: The aggregates of the heat-generating and heat-insulating riser include: heat-insulating materials, structural strength fillers, aluminum powder, aluminum chips, potassium fluoroaluminate, Wherein, the thermal insulation material and / or the structural strength filler include hollow alumina microspheres.

2. The heat-generating and heat-insulating riser according to claim 1, characterized in that: The aggregates of the exothermic and heat-insulating riser include, by weight: 400-450 pieces of insulation materials, 300-350 parts of structural strength filler, 500-600 parts of aluminum powder, 55-75 parts of aluminum chips, 45-55 parts of potassium fluoroaluminate.

3. The heat-generating and heat-insulating riser according to claim 2, characterized in that: The thermal insulation material further comprises floating beads, and the floating beads are mixed with the hollow alumina microspheres in any proportion; The structural strength material further comprises calcined alumina, and the calcined alumina is mixed with the hollow alumina microspheres in any proportion.

4. The heat-generating and heat-insulating riser according to claim 3, characterized in that: In the heat-generating and heat-insulating riser, the mass ratio of the floating beads, hollow alumina microspheres, and calcined alumina is (130-140): (445-455): (110-120).

5. In the heat-generating and heat-insulating riser, the mass ratio of the floating beads, hollow alumina microspheres, calcined alumina, aluminum powder, aluminum chips, and potassium fluoroaluminate is (130-140):(445-455):(110-120):(490-510):(50-60):(40-50).

6. The heat-generating and heat-insulating riser according to claim 1, characterized in that: The crystal form of the alumina hollow microspheres is a-Al2O3 microcrystals.

7. The heat-generating and heat-insulating riser according to claim 1, characterized in that: The inner diameter of the alumina hollow microspheres is 0.2-1 mm.

8. A method for preparing the exothermic and heat-insulating riser according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, partially or completely replacing the floating beads and / or calcined alumina in the aggregate of the original heat-insulating riser with hollow alumina microspheres, and mixing with the remaining aggregates in the original heat-insulating riser to obtain riser aggregate 1; S2, mixing the riser aggregate 1 with the cold box resin component 1 and the component 2 in sequence to obtain a riser premix; S3, placing the riser premix into a core shooting machine, and preparing the heat-generating and heat-insulating riser by a core shooting process, in, In parts by weight, the aggregate of the original heating and heat-insulating riser includes 400-450 parts of floating beads, 300-350 parts of calcined alumina, 500-600 parts of aluminum powder, 55-75 parts of aluminum chips, and 45-55 parts of potassium fluoroaluminate.

9. The method according to claim 8, characterized in that The inner diameter of the alumina hollow microspheres is 0.2-1 mm.

10. The method according to claim 8, characterized in that The mass ratio of the riser aggregate 1 to the cold box resin component 1 and component 2 is 1:(60-70):(60-70).

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