A kind of attapulgite refractory ceramsite

Abstract

The present invention relates to the technical field of attapulgite refractory ceramsite, specifically a attapulgite refractory ceramsite: comprising the following raw materials by weight: 60 to 80 parts of blast furnace slag powder, 60 to 80 parts of kaolin, 40 to 60 parts of attapulgite clay powder, 30 to 40 parts of filler, 20 to 30 parts of coal gangue powder, 10 to 20 parts of feldspar powder, and 4 to 6 parts of binder. In the present invention, the porous and lightweight material of expanded perlite powder is utilized, and after surface treatment with sodium hydroxide, its specific surface area is increased, and subsequent reaction activity is enhanced. By adding 3-aminopropyltriethoxysilane and methyltrimethoxysilane, a hybrid layer can be formed on the surface of the expanded perlite, improving the interface bonding force with other components. The addition of nano-silica can fill the pores for structural reinforcement, improve the density and bonding tightness of the material, and effectively improve the high temperature resistance and strength performance of the attapulgite refractory ceramsite.

Description

Technical Field

[0001] The invention relates to the technical field of attapulgite refractory ceramsite, in particular to attapulgite refractory ceramsite. Background Art

[0002] Attapulgite refractory ceramsite is a porous granular material that is processed, shaped, and calcined at high temperature. It is widely used in kiln linings and insulation layers in the fields of metallurgy, chemical industry, building materials, etc., as well as sewage treatment in the environmental protection industry. It is a refractory and thermal insulation material with excellent performance.

[0003] In the prior art, the structure of attapulgite refractory ceramsite is formed by mixing and firing a plurality of composite materials. After firing, interconnected pores exist in the structure, which affects the high-temperature resistance of the attapulgite refractory ceramsite. Based on this, the present invention provides a attapulgite refractory ceramsite. Summary of the Invention

[0004] The object of the present invention is to provide a attapulgite refractory ceramsite. The attapulgite refractory ceramsite prepared by the present invention not only has good high temperature resistance, but also has excellent compressive strength, thereby effectively improving the performance of the attapulgite refractory ceramsite.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides an attapulgite refractory ceramsite, comprising the following raw materials in parts by weight: 60 to 80 parts of blast furnace slag powder, 60 to 80 parts of kaolin, 40 to 60 parts of attapulgite clay powder, 30 to 40 parts of filler, 20 to 30 parts of coal gangue powder, 10 to 20 parts of feldspar powder, and 4 to 6 parts of a binder;

[0007] The preparation of the filler comprises the following steps:

[0008] S1: base material preparation, wherein the raw materials of the base material include expanded perlite powder, 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane;

[0009] S2: preparing a mixture, wherein the raw materials of the mixture include corn starch, water, borax, diatomaceous earth, and aluminum sol, and the mass of the mixture is 30-40% of the mass of the base material;

[0010] S3: Mixing treatment: the base material and the mixed material are mixed to obtain the filler.

[0011] Furthermore, the method for preparing the base material is as follows: expanded perlite powder and sodium hydroxide aqueous solution are added to a reactor, the reactor temperature is set at 60-70°C, the stirring speed is 200-300 r / min, and the mixture is stirred at a constant temperature for 30-40 minutes. The obtained product is rinsed with deionized water, then drained and added to a reactor, 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane are added to the reactor, the reactor temperature is set at 100-120°C, the stirring speed is 300-500 r / min, and the mixture is stirred at a constant temperature for 40-60 minutes. The obtained product is rinsed with deionized water and then sent to an oven, the oven is set at 60-80°C and dried for 4-6 hours to obtain the base material.

[0012] Furthermore, the mass concentration of the sodium hydroxide aqueous solution is 2-4%, the mass of the sodium hydroxide aqueous solution is 8-12 times the mass of the expanded perlite powder, the mass ratio of 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane is 1: (0.4-0.6): (0.1-0.2), the mass of 3-aminopropyltriethoxysilane is 2-4% of the mass of the expanded perlite powder, and the particle size of the expanded perlite powder is 20-100 μm.

[0013] Furthermore, the method for preparing the mixture is: corn starch, water, and borax are added to a reactor, the reactor temperature is set to 60-70°C, the stirring speed is 60-80 r / min, and constant temperature stirring is performed for 8-12 minutes, and then diatomaceous earth and aluminum sol are added to the reactor. After cooling to room temperature, the stirring speed is set to 200-300 r / min and stirring is performed for 20-30 minutes to obtain a mixture.

[0014] Furthermore, the mass ratio of corn starch, water and borax is 1: (4-6): (0.2-0.4), the mass of diatomaceous earth is 30-50% of the mass of corn starch, and the mass of aluminum sol is 60-80% of the mass of diatomaceous earth.

[0015] Furthermore, the mixing method is as follows: the base material and the mixed material are added to a mixer, the mixer is set to 400-600 r / min and stirred for 30-40 minutes, the resulting product is added to a muffle furnace, the muffle furnace is set to a heating rate of 3-5°C / min, the temperature is raised to 500-600°C, and the temperature is kept warm for 20-30 minutes, and then the cooling rate is set to 4-6°C / min, the temperature is lowered to 40°C, the mixing process is completed, and the filler is obtained.

[0016] Furthermore, the particle size of the blast furnace slag powder, kaolin, and attapulgite clay powder is 2-4 mm, and the particle size of the coal gangue powder and feldspar powder is ≤1 mm.

[0017] Furthermore, the binder is prepared by the following method: methyl cellulose, water glass, glycerin and polyvinyl alcohol are added into a mixer, and the mixer is set at 120 to 160 r / min and stirred for 20 to 30 minutes to prepare the binder.

[0018] Furthermore, the mass ratio of methyl cellulose, water glass, glycerin and polyvinyl alcohol is 1: (0.4-0.6): (2-3): (0.2-0.4).

[0019] In the second aspect, the present invention also provides a preparation method of attapulgite refractory ceramsite, comprising the following steps: weighing blast furnace slag powder, kaolin, attapulgite clay powder, filler, coal gangue powder, feldspar powder, and binder as needed and adding them into a mixer, setting the mixer to 400-600 r / min and stirring for 30-40 minutes, adding the resulting product into a disc granulator for granulation, the resulting particles have a particle size of 3-10 mm and a particle length of 20-30 mm, and calcining the particles, setting the heating rate for the calcination process to 10-15°C / min, heating to 600-800°C, and keeping warm for 3-5 hours to obtain attapulgite refractory ceramsite.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, the porous and lightweight material of expanded perlite powder is used. After surface treatment with sodium hydroxide, its specific surface area is increased, and the subsequent reaction activity is enhanced. By adding 3-aminopropyltriethoxysilane and methyltrimethoxysilane, a hybrid layer can be formed on the surface of the expanded perlite, improving the interfacial bonding force with other components. The addition of nano-silica can fill the pores for structural reinforcement, improve the density and bonding tightness of the material, and effectively improve the high temperature resistance and strength performance of the attapulgite refractory ceramsite.

[0022] 2. In the present invention, by adding corn starch and borax components to the mixture, corn starch and borax can form a viscous substance, which can enhance the bonding performance of the material before sintering. At the same time, borax can utilize its flame retardant properties and the presence of a dense structure to effectively improve the flame retardant and heat-resistant properties of the attapulgite refractory ceramsite. Aluminum sol can be converted into alumina at high temperature, and its higher melting point performance is utilized to further improve the high temperature resistance of the attapulgite refractory ceramsite. DETAILED DESCRIPTION

[0023] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0024] It should be noted that the raw materials used in the following examples are all commercially available raw materials.

[0025] Example 1

[0026] A attapulgite refractory ceramsite comprises the following raw materials in parts by weight: 60 parts of blast furnace slag powder, 60 parts of kaolin, 40 parts of attapulgite clay powder, 30 parts of filler, 20 parts of coal gangue powder, 10 parts of feldspar powder, and 4 parts of binder;

[0027] The preparation of the filler comprises the following steps:

[0028] S1: base material preparation, wherein the raw materials of the base material include expanded perlite powder, 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane;

[0029] S2: preparing a mixture, wherein the raw materials of the mixture include corn starch, water, borax, diatomaceous earth, and aluminum sol, and the mass of the mixture is 30% of the mass of the base material;

[0030] S3: Mixing treatment: the base material and the mixed material are mixed to obtain the filler.

[0031] The base material preparation method comprises the following steps: adding expanded perlite powder and sodium hydroxide aqueous solution into a reactor, setting the temperature of the reactor to 60° C., stirring at a speed of 200 r / min, and stirring at a constant temperature for 30 minutes; rinsing the obtained product with deionized water, draining the water, and adding the obtained product into a reactor; adding 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane into the reactor; setting the temperature of the reactor to 100° C., stirring at a speed of 300 r / min, and stirring at a constant temperature for 40 minutes; rinsing the obtained product with deionized water, and then sending the product into an oven, setting the oven to 60° C. for drying for 4 hours, to obtain the base material.

[0032] The mass concentration of the sodium hydroxide aqueous solution is 2%, and the mass of the sodium hydroxide aqueous solution is 8 times the mass of the expanded perlite micropowder. The mass ratio of 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane is 1:0.4:0.1, and the mass of 3-aminopropyltriethoxysilane is 2% of the mass of the expanded perlite micropowder. The particle size of the expanded perlite micropowder is 20 μm.

[0033] The method for preparing the mixture is as follows: corn starch, water, and borax are added to a reactor, the reactor temperature is set to 60° C., the stirring speed is 60 r / min, and constant temperature stirring is performed for 8 minutes, then diatomaceous earth and aluminum sol are added to the reactor, and after cooling to room temperature, the stirring speed is set to 200 r / min and stirring is performed for 20 minutes to obtain the mixture.

[0034] The mass ratio of corn starch, water and borax is 1:4:0.2, the mass of diatomaceous earth is 30% of the mass of corn starch, and the mass of aluminum sol is 60% of the mass of diatomaceous earth.

[0035] The mixing method is as follows: the base material and the mixed material are added to a mixer, the mixer is set to 400 r / min and stirred for 30 minutes, the obtained product is added to a muffle furnace, the muffle furnace is set to a heating rate of 3°C / min, the temperature is raised to 500°C, and the temperature is kept for 20 minutes, and then the cooling rate is set to 4°C / min, the temperature is lowered to 40°C, and the mixing process is completed to obtain the filler.

[0036] The particle size of the blast furnace slag powder, kaolin, and attapulgite clay powder is 2 mm, and the particle size of the coal gangue powder and feldspar powder is ≤1 mm.

[0037] The binder is prepared by the following method: methyl cellulose, water glass, glycerin and polyvinyl alcohol are added into a mixer, and the mixer is set at 120 r / min and stirred for 20 minutes to prepare the binder.

[0038] The mass ratio of methyl cellulose, water glass, glycerin and polyvinyl alcohol is 1:0.4:2:0.2.

[0039] Preparation method: comprising the following steps: weighing blast furnace slag powder, kaolin, attapulgite clay powder, filler, coal gangue powder, feldspar powder, and binder as needed and adding them into a mixer, setting the mixer to 400r / min and stirring for 30 minutes, adding the resulting product into a disc granulator for granulation, and the resulting particles have a particle size of 3mm and a particle length of 20mm. The particles are calcined, and the calcination process is set to a heating rate of 10°C / min, heating to 600°C, and keeping warm for 3 hours to obtain attapulgite refractory ceramsite.

[0040] Example 2

[0041] A attapulgite refractory ceramsite comprises the following raw materials in parts by weight: 70 parts of blast furnace slag powder, 70 parts of kaolin, 50 parts of attapulgite clay powder, 35 parts of filler, 25 parts of coal gangue powder, 15 parts of feldspar powder, and 5 parts of binder;

[0042] The preparation of the filler comprises the following steps:

[0043] S1: base material preparation, wherein the raw materials of the base material include expanded perlite powder, 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane;

[0044] S2: preparing a mixture, wherein the raw materials of the mixture include corn starch, water, borax, diatomaceous earth, and aluminum sol, and the mass of the mixture is 35% of the mass of the base material;

[0045] S3: Mixing treatment: the base material and the mixed material are mixed to obtain the filler.

[0046] The base material preparation method comprises the following steps: adding expanded perlite powder and sodium hydroxide aqueous solution into a reactor, setting the temperature of the reactor to 65° C., stirring at a speed of 250 r / min, and stirring at a constant temperature for 35 minutes; rinsing the obtained product with deionized water, draining the water, and adding the obtained product into a reactor; adding 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane into the reactor; setting the temperature of the reactor to 110° C., stirring at a speed of 400 r / min, and stirring at a constant temperature for 50 minutes; rinsing the obtained product with deionized water, and then placing the product into an oven, setting the oven to 70° C. for drying for 5 hours, to obtain the base material.

[0047] The mass concentration of the sodium hydroxide aqueous solution is 3%, and the mass of the sodium hydroxide aqueous solution is 10 times the mass of the expanded perlite micropowder. The mass ratio of 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane is 1:0.5:0.15, and the mass of 3-aminopropyltriethoxysilane is 3% of the mass of the expanded perlite micropowder. The particle size of the expanded perlite micropowder is 60μm.

[0048] The method for preparing the mixture is as follows: corn starch, water, and borax are added to a reactor, the reactor temperature is set to 65° C., the stirring speed is 70 r / min, and the mixture is stirred at constant temperature for 10 minutes. Then, diatomaceous earth and aluminum sol are added to the reactor, and after cooling to room temperature, the stirring speed is set to 250 r / min and stirred for 25 minutes to obtain the mixture.

[0049] The mass ratio of corn starch, water and borax is 1:5:0.3, the mass of diatomaceous earth is 40% of the mass of corn starch, and the mass of aluminum sol is 70% of the mass of diatomaceous earth.

[0050] The mixing method is as follows: the base material and the mixed material are added to a mixer, the mixer is set to 500 r / min and stirred for 35 minutes, the obtained product is added to a muffle furnace, the muffle furnace is set to a heating rate of 4°C / min, the temperature is raised to 550°C, and the temperature is kept for 25 minutes, and then the cooling rate is set to 5°C / min, the temperature is lowered to 40°C, and the mixing process is completed to obtain the filler.

[0051] The particle size of the blast furnace slag powder, kaolin, and attapulgite clay powder is 3 mm, and the particle size of the coal gangue powder and feldspar powder is ≤1 mm.

[0052] The binder is prepared by the following method: methyl cellulose, water glass, glycerin and polyvinyl alcohol are added into a mixer, and the mixer is set at 140 r / min and stirred for 25 minutes to prepare the binder.

[0053] The mass ratio of methyl cellulose, water glass, glycerin and polyvinyl alcohol is 1:0.5:2.5:0.3.

[0054] Preparation method: comprising the following steps: weighing blast furnace slag powder, kaolin, attapulgite clay powder, filler, coal gangue powder, feldspar powder, and binder as needed and adding them into a mixer, setting the mixer to 500 r / min and stirring for 35 minutes, adding the resulting product into a disc granulator for granulation, and the resulting particles have a particle size of 6 mm and a particle length of 25 mm. The particles are calcined, and the calcination process is set to a heating rate of 12°C / min, heating to 700°C, and keeping warm for 4 hours to obtain attapulgite refractory ceramsite.

[0055] Example 3

[0056] A attapulgite refractory ceramsite comprises the following raw materials in parts by weight: 80 parts of blast furnace slag powder, 80 parts of kaolin, 60 parts of attapulgite clay powder, 40 parts of filler, 30 parts of coal gangue powder, 20 parts of feldspar powder, and 6 parts of binder;

[0057] The preparation of the filler comprises the following steps:

[0058] S1: base material preparation, wherein the raw materials of the base material include expanded perlite powder, 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane;

[0059] S2: preparing a mixture, wherein the raw materials of the mixture include corn starch, water, borax, diatomaceous earth, and aluminum sol, and the mass of the mixture is 40% of the mass of the base material;

[0060] S3: Mixing treatment: the base material and the mixed material are mixed to obtain the filler.

[0061] The base material preparation method comprises the following steps: adding expanded perlite micropowder and sodium hydroxide aqueous solution into a reactor, setting the temperature of the reactor to 70° C., stirring at a speed of 300 r / min, and stirring at a constant temperature for 40 minutes; rinsing the obtained product with deionized water, draining the water, and adding the obtained product into a reactor; adding 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane into the reactor; setting the temperature of the reactor to 120° C., stirring at a speed of 500 r / min, and stirring at a constant temperature for 60 minutes; rinsing the obtained product with deionized water, and then sending the product into an oven, setting the oven to 80° C. for drying for 6 hours, to obtain the base material.

[0062] The mass concentration of the sodium hydroxide aqueous solution is 4%, and the mass of the sodium hydroxide aqueous solution is 12 times the mass of the expanded perlite micropowder. The mass ratio of 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane is 1:0.6:0.2, and the mass of 3-aminopropyltriethoxysilane is 4% of the mass of the expanded perlite micropowder. The particle size of the expanded perlite micropowder is 100 μm.

[0063] The method for preparing the mixture is as follows: corn starch, water, and borax are added to a reactor, the reactor temperature is set to 70° C., the stirring speed is 80 r / min, and constant temperature stirring is performed for 12 minutes, then diatomaceous earth and aluminum sol are added to the reactor, and after cooling to room temperature, the stirring speed is set to 300 r / min and stirring is performed for 30 minutes to obtain the mixture.

[0064] The mass ratio of corn starch, water and borax is 1:6:0.4, the mass of diatomaceous earth is 50% of the mass of corn starch, and the mass of aluminum sol is 80% of the mass of diatomaceous earth.

[0065] The mixing method is as follows: the base material and the mixed material are added to a mixer, the mixer is set to 600 r / min and stirred for 40 minutes, the obtained product is added to a muffle furnace, the muffle furnace is set to a heating rate of 5°C / min, the temperature is raised to 600°C, and the temperature is kept for 30 minutes, and then the cooling rate is set to 6°C / min, the temperature is lowered to 40°C, and the mixing process is completed to obtain the filler.

[0066] The particle size of the blast furnace slag powder, kaolin, and attapulgite clay powder is 4 mm, and the particle size of the coal gangue powder and feldspar powder is ≤1 mm.

[0067] The binder is prepared by the following method: methyl cellulose, water glass, glycerin and polyvinyl alcohol are added into a mixer, and the mixer is set at 160 r / min and stirred for 30 minutes to prepare the binder.

[0068] The mass ratio of methyl cellulose, water glass, glycerin and polyvinyl alcohol is 1:0.6:3:0.4.

[0069] The preparation method comprises the following steps: weighing blast furnace slag powder, kaolin, attapulgite clay powder, filler, coal gangue powder, feldspar powder and binder as needed and adding them into a mixer, setting the mixer to 600 r / min and stirring for 40 minutes, adding the resulting product into a disc granulator for granulation, and the resulting particles have a particle size of 10 mm and a particle length of 30 mm, and calcining the particles, setting the heating rate for the calcination process to 15°C / min, heating to 800°C, and keeping warm for 5 hours to obtain attapulgite refractory ceramsite.

[0070] Comparative Example 1: The difference between this comparative example and Example 1 is that this comparative example does not contain 3-aminopropyltriethoxysilane.

[0071] Comparative Example 2: The difference between this comparative example and Example 1 is that this comparative example does not contain a mixed material.

[0072] Comparative Example 3: The difference between this comparative example and Example 1 is that in this comparative example, an equal amount of kaolin is used to replace the filler.

[0073] Comparative Example 4: This comparative example is different from Example 1 in that: this comparative example does not contain filler.

[0074] Performance test: The attapulgite refractory ceramsite prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 was subjected to performance tests, and the test data obtained are recorded in the following table:

[0075]

[0076] In the performance test, the test method in GB / T 7322-2017 was used to test the high temperature resistance of the attapulgite refractory ceramsite prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4;

[0077] The compressive strength of the attapulgite refractory ceramsite prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 was tested using the test method in GB / T 5072-2023.

[0078] It can be seen that the high temperature resistance and compressive strength performance of the attapulgite refractory ceramsite prepared in Comparative Examples 1, 2, 3, and 4 are lower than those in Examples 1, 2, and 3; this shows that: the porous and lightweight material of the expanded perlite powder is increased after surface treatment with sodium hydroxide, and the subsequent reaction activity is enhanced. By adding 3-aminopropyltriethoxysilane and methyltrimethoxysilane, a hybrid layer can be formed on the surface of the expanded perlite, thereby improving the interfacial bonding force with other components. The addition of nano-silica can fill the pores for structural reinforcement, improve the density and bonding tightness of the material, and effectively improve the high temperature resistance and strength performance of the attapulgite refractory ceramsite;

[0079] By adding corn starch and borax components to the mixture, corn starch and borax can form a sticky substance, which can enhance the bonding performance of the material before sintering. At the same time, borax can utilize its flame retardant properties and the existence of a dense structure to effectively improve the flame retardant and heat resistance of the attapulgite refractory ceramsite. Aluminum sol can be converted into alumina at high temperature, and its higher melting point performance is utilized to further improve the high temperature resistance of the attapulgite refractory ceramsite.

[0080] By comparing and analyzing the relevant data in the table, it can be seen that the attapulgite refractory ceramsite prepared by the present invention not only has good high temperature resistance, but also has excellent compressive strength. This shows that the attapulgite refractory ceramsite provided by the present invention has a broader market prospect and is more suitable for promotion.

[0081] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0082] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An attapulgite refractory ceramsite, characterized in that: The invention comprises the following raw materials in parts by weight: 60 to 80 parts of blast furnace slag powder, 60 to 80 parts of kaolin, 40 to 60 parts of attapulgite clay powder, 30 to 40 parts of filler, 20 to 30 parts of coal gangue powder, 10 to 20 parts of feldspar powder, and 4 to 6 parts of binder; The preparation of the filler comprises the following steps: S1: base material preparation, the base material preparation method is: expanded perlite powder and sodium hydroxide aqueous solution are added to a reactor, the reactor temperature is set at 60-70°C, the stirring speed is 200-300 r / min, and the constant temperature stirring is performed for 30-40 min, the resulting product is rinsed with deionized water, then drained and added to a reactor, 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane are added to the reactor, the reactor temperature is set at 100-120°C, the stirring speed is 300-500 r / min, and the constant temperature stirring is performed for 40-60 min, the resulting product is rinsed with deionized water, then sent to an oven, and the oven is set at 60-80°C for drying for 4-6 hours to obtain the base material; S2: preparing a mixture, wherein the method for preparing the mixture is as follows: adding corn starch, water, and borax into a reactor, setting the temperature of the reactor to 60-70°C, stirring at a speed of 60-80 r / min, and stirring at the constant temperature for 8-12 minutes, then adding diatomaceous earth and aluminum sol into the reactor, and after cooling to room temperature, setting the stirring speed to 200-300 r / min and stirring for 20-30 minutes to obtain a mixture; S3: Mixing treatment. The mixing treatment method is as follows: the base material and the mixed material are added to a mixer, the mixer is set to 400-600 r / min and stirred for 30-40 minutes, the resulting product is added to a muffle furnace, the muffle furnace is set to a heating rate of 3-5°C / min, the temperature is raised to 500-600°C, and the temperature is kept for 20-30 minutes, and then the cooling rate is set to 4-6°C / min, and the temperature is lowered to 40°C to complete the mixing treatment to obtain the filler.

2. The attapulgite refractory ceramsite according to claim 1, characterized in that The mass concentration of the sodium hydroxide aqueous solution is 2-4%, the mass of the sodium hydroxide aqueous solution is 8-12 times the mass of the expanded perlite micropowder, the mass ratio of 3-aminopropyltriethoxysilane, nano-silica, and methyltrimethoxysilane is 1: (0.4-0.6): (0.1-0.2), the mass of 3-aminopropyltriethoxysilane is 2-4% of the mass of the expanded perlite micropowder, and the particle size of the expanded perlite micropowder is 20-100 μm.

3. The attapulgite refractory ceramsite according to claim 1, characterized in that The mass ratio of corn starch, water and borax is 1: (4-6): (0.2-0.4), the mass of diatomaceous earth is 30-50% of the mass of corn starch, and the mass of aluminum sol is 60-80% of the mass of diatomaceous earth.

4. The attapulgite refractory ceramsite according to claim 1, characterized in that The particle sizes of the blast furnace slag powder, kaolin and attapulgite clay powder are 2-4 mm, and the particle sizes of the coal gangue powder and feldspar powder are ≤1 mm.

5. The attapulgite refractory ceramsite according to claim 1, characterized in that The binder is prepared by the following method: methyl cellulose, water glass, glycerin and polyvinyl alcohol are added into a mixer, and the mixer is set at 120 to 160 r / min and stirred for 20 to 30 minutes to prepare the binder.

6. The attapulgite refractory ceramsite according to claim 5, characterized in that The mass ratio of methyl cellulose, water glass, glycerin and polyvinyl alcohol is 1: (0.4-0.6): (2-3): (0.2-0.4).

7. A method for preparing the attapulgite refractory ceramsite according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: weighing blast furnace slag powder, kaolin, attapulgite clay powder, filler, coal gangue powder, feldspar powder and binder as required, adding the powders into a mixer, setting the mixer at 400-600 r / min and stirring for 30-40 min, adding the obtained product into a disc granulator for granulation, the obtained particles have a particle size of 3-10 mm and a particle length of 20-30 mm, calcining the particles, setting the heating rate during the calcination process at 10-15° C. / min, heating the temperature to 600-800° C., and keeping the temperature for 3-5 h, thereby obtaining attapulgite refractory ceramsite.

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