A kind of sintering-free aeolian sand pottery sand and preparation method thereof

Abstract

The present invention provides a sinter-free aeolian sand pottery sand and a preparation method thereof. The sinter-free aeolian sand pottery sand of the present invention utilizes the alkali activity of aeolian sand powder and industrial waste slag to prepare the sinter-free aeolian sand pottery sand, and the sinter-free aeolian sand pottery sand is compounded with aeolian sand for use, which can solve the unreasonable grading of aeolian sand while reducing the environmental problems caused by the use of river sand and machine-made sand; the preparation process of the present invention is simple, no CO2 emission is required due to firing, the performance of the product is easy to adjust, and functionalization is convenient to achieve; the present invention uses aeolian sand powder as a filler and binder for the sinter-free pottery sand, and uses fine-grained aeolian sand (0.08-0.3mm) to provide a skeleton support for the sinter-free aeolian sand pottery sand, further improving the mechanical properties of the sinter-free aeolian sand pottery sand; the present invention provides a new resource utilization approach for aeolian sand, opens up a new path for the high-value utilization of aeolian sand, and plays a positive role in the sustainable development of mineral resources.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to sintering-free aeolian sand pottery sand and a preparation method thereof. Background Art

[0002] Aeolian sand is formed by the disintegration of sandstone due to strong desert sunlight, scarce precipitation, and high evaporation. Under long-term wind movement, the edges and corners of the stone fragments are polished and rounded, with small particle size, and are deposited by wind over long distances. The particle grading of aeolian sand is discontinuous, with uniform particle distribution and basically less than 1 mm. This grading feature increases the amount of cement when used as fine aggregate, and leads to reduced fluidity and strength of aeolian sand concrete. Therefore, aeolian sand is often compounded with river sand and machine-made sand to prepare concrete, and inferior stone chips, stone powder, and even mud are used as machine-made sand, affecting the quality of the project.

[0003] As a lightweight and porous granular material, ceramic sand is mainly used in the construction industry and the fields of thermal insulation and refractory materials. In the production process of ceramic sand, natural resources such as shale and clay are mainly used as raw materials. However, since these raw materials are non-renewable resources, large-scale mining and use may cause environmental damage, thus posing a major threat to the sustainable production and development of ceramic sand. Therefore, finding alternative raw materials to reduce the impact on the environment is crucial for the future development of the ceramic sand industry.

[0004] Using aeolian sand as the main raw material and mixing it with industrial solid waste to form balls to prepare aeolian sand unburned pottery sand provides a new resource utilization method for aeolian sand and industrial solid waste. The compounding of aeolian sand unburned pottery sand and aeolian sand can solve the problem of unreasonable grading of aeolian sand, while reducing the environmental problems caused by the use of river sand and machine-made sand, and opening up a new path for the high-value utilization of aeolian sand. However, there is currently no solution to combine aeolian sand with industrial waste to prepare pottery sand. Summary of the invention

[0005] In view of this, the present invention provides a sintering-free aeolian sand pottery sand and a preparation method thereof. Its main purpose is to use aeolian sand powder, silicate cement, industrial waste slag, aeolian sand, alkaline activator, water, etc. to develop a sintering-free aeolian sand pottery sand, dispose of industrial waste, and realize the resource utilization, high value and diversified utilization of aeolian sand.

[0006] In a first aspect, the present invention provides a sinter-free aeolian sand pottery sand, comprising the following components in parts by weight:

[0007] 50-80 parts of aeolian sand powder, 10-40 parts of Portland cement, 10-40 parts of industrial waste slag, 10-30 parts of aeolian sand, 3-12 parts of alkaline activator, and 15-30 parts of water.

[0008] Preferably, the particle size of the aeolian sand powder is ≤0.075 mm.

[0009] Preferably, the particle size of the aeolian sand is 0.08-0.3 mm.

[0010] Preferably, the silicate cement is P·O 42.5 silicate cement.

[0011] Preferably, the industrial waste residue includes at least one of mineral powder and fly ash.

[0012] Preferably, the alkaline activator includes at least one of sodium silicate, sodium sulfate, sodium hydroxide, calcium hydroxide, calcium oxide, and potassium hydroxide.

[0013] In a second aspect, the present invention further provides a method for preparing the sinter-free aeolian sand pottery sand, comprising the following steps:

[0014] Mixing silicate cement, industrial waste residue, aeolian sand and aeolian sand powder to obtain a mixture;

[0015] Mix water and alkaline activator and stir to obtain mixing water;

[0016] Mix the mixed material with mixing water, stir evenly, and prepare a mixed slurry;

[0017] Adding the mixed slurry to a granulator for granulation to obtain granulated material;

[0018] The granulated material is placed in an indoor environment for natural curing, then subjected to steam curing, and finally subjected to standard curing to obtain sintering-free aeolian sand pottery sand.

[0019] Preferably, the natural curing is specifically as follows: placing the granules in an indoor environment, curing at a temperature of 20±3°C and a relative humidity of 60±5%RH for 1 to 3 days;

[0020] Steam maintenance is specifically as follows:

[0021] The granulated material after natural curing is steam cured in an environment with a curing temperature of 40 to 90° C. for 6 to 48 hours.

[0022] Preferably, the standard curing is specifically as follows: placing the granulated material after steam curing in an environment with a temperature of 20° C.±2° C. and a relative humidity of 95% RH or higher for curing for 28 days.

[0023] Preferably, the sinter-free aeolian sand pottery sand is spherical with a diameter of 1.18 to 4.75 mm.

[0024] The sinter-free aeolian sand pottery sand of the present invention has the following beneficial effects compared with the prior art:

[0025] The sintering-free aeolian sand pottery sand of the present invention utilizes the alkali activity of aeolian sand powder and industrial waste slag to prepare the sintering-free aeolian sand pottery sand, and the sintering-free aeolian sand pottery sand is compounded with aeolian sand for use, which can solve the unreasonable grading of aeolian sand and reduce the environmental problems caused by the use of river sand and machine-made sand; the preparation process of the present invention is simple, no CO2 emission is required due to firing, the performance of the product is easy to adjust, and functionalization is convenient to achieve; the present invention uses aeolian sand powder as a filler and binder for the sintering-free pottery sand, and uses fine-grained aeolian sand (0.08-0.3mm) to provide a skeleton support for the sintering-free aeolian sand pottery sand, thereby further improving the mechanical properties of the sintering-free aeolian sand pottery sand; the present invention provides a new resource utilization approach for aeolian sand, opens up a new path for the high-value utilization of aeolian sand, and plays a positive role in the sustainable development of mineral resources. DETAILED DESCRIPTION

[0026] 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.

[0027] The following are described in detail. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments. In addition, in the description of the present application, the term "including" means "including but not limited to". Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and simplicity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single values ​​within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the numbered ranges, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated in this article, it is meant to include any quoted numbers (fractions or integers) within the indicated range.

[0028] The present invention provides a sintering-free aeolian sand pottery sand, comprising the following components in parts by weight:

[0029] 50-80 parts of aeolian sand powder, 10-40 parts of Portland cement, 10-40 parts of industrial waste slag, 10-30 parts of aeolian sand, 3-12 parts of alkaline activator, and 15-30 parts of water.

[0030] The present invention utilizes aeolian sand as a main raw material, and mixes it with industrial solid waste to form balls by stirring and agitating, thereby preparing aeolian sand unburned pottery sand, providing a new resource utilization approach for aeolian sand and industrial solid waste; the compounding of aeolian sand unburned pottery sand and aeolian sand can solve the problem of unreasonable grading of aeolian sand, and while reducing the environmental problems caused by the use of river sand and machine-made sand, it opens up a new path for the high-value utilization of aeolian sand.

[0031] The sinter-free aeolian sand pottery sand of the present invention uses aeolian sand powder and industrial waste slag as main raw materials. Under the stimulation of an alkaline activator, the Si-O-Si bonds and Al-O-Al bonds on the surface of the aeolian sand powder and the industrial waste slag glass body are broken and separated from the particle surface to form [SiO4] 4- and [AlO4] 5- Dispersed in the solution, OH in the liquid phase - Rapid adsorption to the fracture surface of the particles increases the pH value near the fracture surface, causing more Si-O-Si bonds to break. 4- and [AlO4] 5- It continues to increase and gradually forms flocculent products in the liquid phase. When the flocculent products accumulate to a certain extent, they undergo condensation to form CSH and CAH, which overlap with AFt, CSH and Ca(OH)2 generated by the hydration of silicate cement. In addition, aeolian sand is filled in the matrix as aggregate to improve the mechanical properties of the matrix.

[0032] In some embodiments, the aeolian sand powder is ground aeolian sand, and the particle size of the aeolian sand powder is ≤0.075 mm.

[0033] In some embodiments, the particle size of the aeolian sand is 0.08-0.3 mm.

[0034] In some embodiments, the silicate cement is P·O 42.5 silicate cement.

[0035] In some embodiments, the industrial waste residue includes at least one of mineral powder and fly ash.

[0036] Specifically, the mineral powder is S95 grade mineral powder.

[0037] In some embodiments, the alkaline activator includes at least one of sodium silicate, sodium sulfate, sodium hydroxide, calcium hydroxide, calcium oxide, and potassium hydroxide.

[0038] Based on the same inventive concept, the present invention also provides a method for preparing the above-mentioned sintering-free aeolian sand pottery sand, comprising the following steps:

[0039] S1, mixing silicate cement, industrial waste residue, aeolian sand and aeolian sand powder to obtain a mixture;

[0040] S2, mixing water and alkaline activator and stirring to obtain mixing water;

[0041] S3, mixing the mixed material with mixing water, stirring evenly to obtain a mixed slurry;

[0042] S4, adding the mixed slurry to a granulator for granulation to obtain granules;

[0043] S5. The granulated material is placed in an indoor environment for natural curing, then steam curing is performed, and finally standard curing is performed to obtain sintering-free aeolian sand pottery sand.

[0044] In some embodiments, natural curing specifically includes placing the granules in an indoor environment and curing them at a temperature of 20±3° C. and a relative humidity of 60±5% RH for 1 to 3 days.

[0045] In some embodiments, steam curing is specifically:

[0046] The granulated material after natural curing is steam cured in an environment with a curing temperature of 40 to 90° C. for 6 to 48 hours.

[0047] In some embodiments, standard curing specifically includes placing the granulated material after steam curing in an environment with a temperature of 20° C.±2° C. and a relative humidity of 95% RH or higher for curing for 28 days.

[0048] In some embodiments, the sinter-free aeolian sand is spherical with a diameter of 1.18 to 4.75 mm.

[0049] In some embodiments, silicate cement, industrial waste residue, aeolian sand and aeolian sand powder are mixed and placed in a disperser for dispersion for 3 to 5 minutes to obtain a mixture.

[0050] The sintering-free aeolian sand pottery sand and the preparation method thereof of the present invention have at least the following advantages: the preparation process of the present invention is simple, no CO2 emission is required due to firing, the performance of the product is easy to adjust, and functionalization is convenient to achieve; the present invention utilizes the alkali activity of aeolian sand powder and industrial waste slag to prepare the sintering-free aeolian sand pottery sand, and the sintering-free aeolian sand pottery sand is compounded with aeolian sand, which can solve the unreasonable grading of aeolian sand and reduce the environmental problems caused by the use of river sand and machine-made sand; the present invention uses aeolian sand powder as a filler and binder for the sintering-free pottery sand, and uses fine-grained aeolian sand (0.08-0.3mm) to provide a skeleton support for the sintering-free aeolian sand pottery sand, thereby further improving the mechanical properties of the sintering-free aeolian sand pottery sand; the present invention provides a new resource utilization approach for aeolian sand, opens up a new path for the high-value utilization of aeolian sand, and plays a positive role in the sustainable development of mineral resources.

[0051] The following further describes the sinter-free aeolian sand pottery sand and its preparation method of the present application with specific examples. This section further describes the content of the present invention in conjunction with specific examples, but should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0052] Example 1

[0053] This embodiment provides a sinter-free aeolian sand pottery sand, comprising the following components by weight: 60 parts of aeolian sand powder, 20 parts of silicate cement, 20 parts of industrial waste residue, 10 parts of aeolian sand, 6 parts of alkaline activator, and 25 parts of water;

[0054] Among them, the aeolian sand powder is finely ground aeolian sand, and the average particle size of the aeolian sand powder is 0.035mm;

[0055] The silicate cement is P·O 42.5 silicate cement;

[0056] Industrial waste residue is mineral powder, and the mineral powder is S95 grade mineral powder;

[0057] The average particle size of aeolian sand is 0.19 mm;

[0058] The alkaline activator is sodium silicate.

[0059] This embodiment also provides a method for preparing the above-mentioned sintering-free aeolian sand pottery sand, comprising the following steps:

[0060] S1. Mix silicate cement, industrial waste residue, aeolian sand and aeolian sand powder, place in a disperser, and disperse for 5 minutes to obtain a mixture;

[0061] S2, mixing water and alkaline activator and stirring to obtain mixing water;

[0062] S3, mixing the mixed material with mixing water, stirring evenly to obtain a mixed slurry;

[0063] S4, adding the mixed slurry to a granulator for granulation to obtain granules;

[0064] S5. The granulated material is placed in an indoor environment for natural curing, then steam curing is performed, and finally standard curing is performed to obtain sintering-free aeolian sand pottery sand.

[0065] The natural curing is as follows: placing the granulated material in an indoor environment and curing it at a temperature of 20° C. and a relative humidity of 60% RH for 1 day;

[0066] Steam maintenance is specifically as follows:

[0067] The granulated material after natural curing is steam cured in an environment with a curing temperature of 40°C for 6 hours;

[0068] The standard curing is specifically as follows: placing the granulated material after steam curing in an environment with a temperature of 20° C. and a relative humidity of 95% RH or above (specifically, the relative humidity is 98% RH) for 28 days.

[0069] Example 2

[0070] This embodiment provides a sinter-free aeolian sand pottery sand, comprising the following components by weight: 70 parts of aeolian sand powder, 20 parts of Portland cement, 10 parts of industrial waste residue, 20 parts of aeolian sand, 3 parts of alkaline activator, and 18 parts of water;

[0071] Among them, the aeolian sand powder is finely ground aeolian sand, and the average particle size of the aeolian sand powder is 0.035mm;

[0072] The silicate cement is P·O 42.5 silicate cement;

[0073] Industrial waste residue is mineral powder, and the mineral powder is S95 grade mineral powder;

[0074] The average particle size of aeolian sand is 0.19 mm;

[0075] The alkaline activator is sodium hydroxide.

[0076] This embodiment also provides a method for preparing the above-mentioned sintering-free aeolian sand pottery sand, comprising the following steps:

[0077] S1. Mix silicate cement, industrial waste residue, aeolian sand and aeolian sand powder, place in a disperser, and disperse for 5 minutes to obtain a mixture;

[0078] S2, mixing water and alkaline activator and stirring to obtain mixing water;

[0079] S3, mixing the mixed material with mixing water, stirring evenly to obtain a mixed slurry;

[0080] S4, adding the mixed slurry to a granulator for granulation to obtain granules;

[0081] S5. The granulated material is placed in an indoor environment for natural curing, then steam curing is performed, and finally standard curing is performed to obtain sintering-free aeolian sand pottery sand.

[0082] The natural curing is as follows: placing the granulated material in an indoor environment and curing it at a temperature of 20° C. and a relative humidity of 60% RH for 1 day;

[0083] Steam maintenance is specifically as follows:

[0084] The granulated material after natural curing is steam cured in an environment with a curing temperature of 40°C for 6 hours;

[0085] The standard curing is specifically as follows: placing the granulated material after steam curing in an environment with a temperature of 20° C. and a relative humidity of 95% RH or above (specifically, the relative humidity is 98% RH) for 28 days.

[0086] Example 3

[0087] This embodiment provides a sinter-free aeolian sand pottery sand, comprising the following components by weight: 60 parts of aeolian sand powder, 20 parts of silicate cement, 20 parts of industrial waste residue, 10 parts of aeolian sand, 6 parts of alkaline activator, and 25 parts of water;

[0088] Among them, the aeolian sand powder is finely ground aeolian sand, and the average particle size of the aeolian sand powder is 0.035mm;

[0089] The silicate cement is P·O 42.5 silicate cement;

[0090] Industrial waste residue is fly ash;

[0091] The average particle size of aeolian sand is 0.19 mm;

[0092] The alkaline activator is sodium silicate.

[0093] This embodiment also provides a method for preparing the above-mentioned sintering-free aeolian sand pottery sand, comprising the following steps:

[0094] S1. Mix silicate cement, industrial waste residue, aeolian sand and aeolian sand powder, place in a disperser, and disperse for 5 minutes to obtain a mixture;

[0095] S2, mixing water and alkaline activator and stirring to obtain mixing water;

[0096] S3, mixing the mixed material with mixing water, stirring evenly to obtain a mixed slurry;

[0097] S4, adding the mixed slurry to a granulator for granulation to obtain granules;

[0098] S5. The granulated material is placed in an indoor environment for natural curing, then steam curing is performed, and finally standard curing is performed to obtain sintering-free aeolian sand pottery sand.

[0099] The natural curing is as follows: placing the granulated material in an indoor environment and curing it at a temperature of 20° C. and a relative humidity of 60% RH for 1 day;

[0100] Steam maintenance is specifically as follows:

[0101] The granulated material after natural curing is steam cured in an environment with a curing temperature of 40°C for 6 hours;

[0102] The standard curing is specifically as follows: placing the granulated material after steam curing in an environment with a temperature of 20° C. and a relative humidity of 95% RH or above (specifically, the relative humidity is 98% RH) for 28 days.

[0103] Example 4

[0104] This embodiment provides a sinter-free aeolian sand pottery sand, comprising the following components by weight: 70 parts of aeolian sand powder, 20 parts of Portland cement, 10 parts of industrial waste residue, 20 parts of aeolian sand, 3 parts of alkaline activator, and 18 parts of water;

[0105] Among them, the aeolian sand powder is finely ground aeolian sand, and the average particle size of the aeolian sand powder is 0.035mm;

[0106] The silicate cement is P·O 42.5 silicate cement;

[0107] Industrial waste residue is fly ash;

[0108] The average particle size of aeolian sand is 0.19 mm;

[0109] The alkaline activator is sodium hydroxide.

[0110] This embodiment also provides a method for preparing the above-mentioned sintering-free aeolian sand pottery sand, comprising the following steps:

[0111] S1. Mix silicate cement, industrial waste residue, aeolian sand and aeolian sand powder, place in a disperser, and disperse for 5 minutes to obtain a mixture;

[0112] S2, mixing water and alkaline activator and stirring to obtain mixing water;

[0113] S3, mixing the mixed material with mixing water, stirring evenly to obtain a mixed slurry;

[0114] S4, adding the mixed slurry to a granulator for granulation to obtain granules;

[0115] S5. The granulated material is placed in an indoor environment for natural curing, then steam curing is performed, and finally standard curing is performed to obtain sintering-free aeolian sand pottery sand.

[0116] The natural curing is as follows: placing the granulated material in an indoor environment and curing it at a temperature of 20° C. and a relative humidity of 60% RH for 1 day;

[0117] Steam maintenance is specifically as follows:

[0118] The granulated material after natural curing is steam cured in an environment with a curing temperature of 40°C for 6 hours;

[0119] The standard curing is specifically as follows: placing the granulated material after steam curing in an environment with a temperature of 20° C. and a relative humidity of 95% RH or above (specifically, the relative humidity is 98% RH) for 28 days.

[0120] Performance Testing

[0121] The sinter-free aeolian sand prepared in Examples 1 to 4 was tested for cylinder compressive strength, apparent density, bulk density and water absorption with reference to Light Aggregate and Test Methods Thereof Part 2: Test Methods for Light Aggregate (GB / T 17431.2-2010). The results are shown in Table 1.

[0122] Table 1 - Properties of the sinter-free aeolian sand prepared in Examples 1 to 4

[0123]

[0124] It can be seen from Table 1 that the cylinder compressive strength of the sinter-free aeolian sand prepared in Example 1 is 11.6 MPa and the apparent density is 1656 kg / m 3 , bulk density is 1162kg / m 3 The water absorption rate in 1h is 6.3%; the cylinder compressive strength of the sinter-free aeolian sand prepared in Example 2 is 10.9MPa, and the apparent density is 1724kg / m 3 , bulk density is 1198kg / m 3 , 1h water absorption rate is 5.2%; the cylinder compressive strength of the sinter-free aeolian sand prepared in Example 3 is 6.1MPa, and the apparent density is 1667kg / m 3 , bulk density is 1122kg / m 3 , 1h water absorption rate is 9.6%; the cylinder compressive strength of the sinter-free aeolian sand prepared in Example 4 is 5.7MPa, and the apparent density is 1792kg / m 3 , bulk density is 1178kg / m 3 The water absorption rate in 1h is 6.0%. The bulk density of the sinter-free aeolian sand prepared in Examples 1 to 4 is less than 1200 kg / m 3 The maximum cylinder pressure strength reaches 11.6MPa, and the 1h water absorption rate is less than 10%. It is a light aggregate with high application value.

[0125] 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 sinter-free aeolian sand pottery sand, characterized in that: The invention comprises the following components by weight: 60-70 parts of aeolian sand powder, 20 parts of silicate cement, 10-20 parts of industrial waste residue, 10-20 parts of aeolian sand, 3-6 parts of alkaline activator and 18-25 parts of water; Aeolian sand powder is finely ground aeolian sand, and the average particle size of aeolian sand powder is 0.035mm; The average particle size of aeolian sand is 0.19 mm; The silicate cement is P·O 42.5 silicate cement; The industrial waste residue is S95 grade mineral powder; The alkaline activator includes at least one of sodium silicate and sodium hydroxide; The method for preparing the sinter-free aeolian sand pottery sand comprises the following steps: Mixing silicate cement, industrial waste residue, aeolian sand and aeolian sand powder to obtain a mixture; Mix water and alkaline activator and stir to obtain mixing water; Mix the mixed material with mixing water, stir evenly, and prepare a mixed slurry; Adding the mixed slurry to a granulator for granulation to obtain granulated material; The granulated material is placed in an indoor environment for natural curing, then subjected to steam curing, and finally subjected to standard curing to obtain sinter-free aeolian sand pottery sand; The specific natural curing is as follows: the granulated material is placed in an indoor environment and cured for 1 to 3 days at a temperature of 20±3°C and a relative humidity of 60±5%; Steam maintenance is specifically as follows: The granulated material after natural curing is steam cured in an environment with a curing temperature of 40 to 90°C for 6 to 48 hours; The standard curing is as follows: the granulated material after steam curing is placed in an environment with a temperature of 20°C ± 2°C and a relative humidity of more than 95% for curing for 28 days.

2. A method for preparing sinter-free aeolian sand pottery sand as claimed in claim 1, characterized in that: The following steps are involved: Mixing silicate cement, industrial waste residue, aeolian sand and aeolian sand powder, placing in a disperser, and dispersing for 3 to 5 minutes to obtain a mixture; Mix water and alkaline activator and stir to obtain mixing water; Mix the mixed material with mixing water, stir evenly, and prepare a mixed slurry; Adding the mixed slurry to a granulator for granulation to obtain granulated material; The granulated material is placed in an indoor environment for natural curing, then subjected to steam curing, and finally subjected to standard curing to obtain sinter-free aeolian sand pottery sand; The specific natural curing is as follows: the granulated material is placed in an indoor environment and cured for 1 to 3 days at a temperature of 20±3°C and a relative humidity of 60±5%; Steam maintenance is specifically as follows: The granulated material after natural curing is steam cured in an environment with a curing temperature of 40 to 90°C for 6 to 48 hours; The standard curing is as follows: the granulated material after steam curing is placed in an environment with a temperature of 20°C ± 2°C and a relative humidity of more than 95% for curing for 28 days.

3. The method for preparing sinter-free aeolian sand pottery sand according to claim 2, characterized in that: The sinter-free aeolian sand pottery sand is spherical and has a diameter of 1.18 to 4.75 mm.

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