CN114773071B - Ceramsite sand for high-end casting and preparation method thereof - Google Patents

Ceramsite sand for high-end casting and preparation method thereof Download PDF

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CN114773071B
CN114773071B CN202210364866.5A CN202210364866A CN114773071B CN 114773071 B CN114773071 B CN 114773071B CN 202210364866 A CN202210364866 A CN 202210364866A CN 114773071 B CN114773071 B CN 114773071B
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sand
ceramsite sand
composite additive
casting
waste
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CN114773071A (en
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李维鹏
徐东芳
安良田
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Hebei Sheng Huoxin Mstar Technology Ltd
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Hebei Sheng Huoxin Mstar Technology Ltd
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    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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Abstract

The invention relates to ceramsite sand for high-end casting, which is prepared from the following raw materials: waste fly ash, aluminum-containing tailing waste, bauxite and a composite additive; the composite additive comprises manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide which are mixed uniformly in advance. The raw materials for preparing the ceramsite sand comprise waste fly ash, aluminum-containing tailing waste, bauxite and a composite additive, and particularly, the performance of the ceramsite sand can be greatly improved by adding the composite additive, and the method comprises the following steps: (1) High refractoriness, reduced sand sticking of castings and improved collapsibility; the sand removal is easier; (2) The expansion rate is low, the defects of the casting are reduced, and the size precision is improved; (3) The angular coefficient is low, the grain shape is round, and the air permeability and the surface precision of the casting are improved; (4) The strength is high, the crushing rate is low, the material is repeatedly recycled, the energy is saved, the environment is protected, and the emission of solid wastes is reduced; (5) Low bulk density, reduced resin consumption, and improved tensile and bending strength of sand mold.

Description

Ceramsite sand for high-end casting and preparation method thereof
Technical Field
The invention relates to the technical field of high-end casting materials, in particular to ceramsite sand for high-end casting and a preparation method thereof.
Background
At present, more than 80% of castings are finished by sand casting. The foundry sand mainly includes silica sand, japanese CB sand, and the like. And (3) mixing the casting (3D printing) sand and the curing agent, conveying the mixture into a powder spreader of 3D printing equipment, spraying resin on the surface of a laying layer when each layer of sand mixed with the curing agent is laid, and circulating the steps until all layers of the product to be printed are finished, so as to prepare the 3D printing product. Because the silica sand has low refractoriness, large thermal expansion rate and poor air permeability, a large amount of gas generated by the interior of the silica sand due to strong heat radiation effect cannot be discharged in time, so that the phenomenon of fire choking can occur, and the defects of air holes, cold shut and the like are generated in castings, even the silica sand is scrapped, thereby being not applied to high-end casting. Japanese CB sand relies on import, has high economic cost and seriously restricts the development of high-end casting.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a high-end casting ceramsite sand and a preparation method thereof, which has the advantages of high refractoriness, high strength, low thermal expansion rate, low angle coefficient, low breakage rate, low bulk density, etc., and solves the technical problems of low refractoriness, high thermal expansion rate, poor air permeability, etc. of the existing silica sand.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, the invention provides ceramsite sand for high-end casting, which is prepared from the following raw materials: waste fly ash, aluminum-containing tailing waste, bauxite and a composite additive;
the composite additive comprises manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide which are mixed uniformly in advance.
Preferably, in the composite additive, the mass ratio of manganese ore powder, clinker, iron oxide, silicon oxide and titanium oxide is 1-50:50-100:1-50:1-50:1-50.
Preferably, in the raw material components, the mixing mass ratio of the waste fly ash, the waste material containing aluminum tailings, the bauxite and the composite additive is 4-6:2-4:8-12.
In a second aspect, the present invention provides a method for preparing high-end casting ceramsite sand, comprising:
s1, preparing a mixture: respectively grinding the waste fly ash, the aluminum-containing tailing waste, the bauxite and the composite additive to obtain powder with the particle size of more than or equal to 800 meshes, and mixing to obtain dry powder; wherein the composite additive comprises manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide which are mixed uniformly in advance;
s2, ageing and homogenizing: adding water into the dry powder material, mixing to obtain a wet material, controlling the water content in the wet material to be 16-20%, and standing the mixed wet material for 2-3 days;
s3, granulating: crushing the aged wet material into powder, adding dry powder during crushing, and granulating in a rotary granulator to obtain a primary ceramsite sand product;
s4, calcining: and drying and calcining the primary ceramsite sand at 1350-1550 ℃ for 10-15 hours to obtain the high-end ceramsite sand for casting.
In the calcining process, the internal organization structure of the ceramsite sand is subjected to phase change to form a large amount of mullite phase and quartz phase and glass phase mixed tissues, and a foundation is laid for the good technological properties of the ceramsite sand for high-end casting (3D printing).
According to the preferred embodiment of the invention, in S1, the mixing mass ratio of the waste fly ash, the aluminum-containing tailing waste, the bauxite and the composite additive is 4-6:2-4:8-12.
According to a preferred embodiment of the invention, in S1, the mass ratio of manganese ore powder, clinker, iron oxide, silicon oxide and titanium oxide in the composite additive is 1-50:50-100:1-50:1-50:1-50.
According to a preferred embodiment of the invention, in S1, after the dry powder material is obtained, the dry powder material is further winnowed by an ultrafine winnowing machine, the particle size of the dry powder material is homogenized and refined, the mesh number reaches 500-800 meshes, and the dry powder material is used for aging homogenization.
According to the preferred embodiment of the present invention, in S3, during the granulation process, the moisture content and the roundness of the primary granules are detected at intervals of 30-60min, water is added or the operating parameters of the rotary granulator are adjusted according to the detected moisture content and roundness, so as to prepare the primary ceramsite sand product with an angle form factor of <1.19 and a particle size distribution range of 0.075-0.212 mm.
According to a preferred embodiment of the present invention, in S3, after the completion of the granulation, the primary ceramsite sand is classified and sieved to obtain a plurality of primary ceramsite sand products with different grade size distributions.
The invention also relates to the high-end ceramsite sand for casting, which is prepared by the preparation method in the embodiment.
(III) advantageous technical effects
Compared with the prior art, the main technical contribution of the invention lies in:
1. the raw materials for preparing the ceramsite sand comprise waste fly ash, aluminum-containing tailing waste, bauxite and a composite additive, and particularly, the performance of the ceramsite sand can be greatly improved by adding the composite additive, and the method comprises the following steps: (1) High refractoriness (refractoriness 1790-1900 ℃), reduces sand sticking of castings and improves collapsibility; the sand removal is easier; (2) The expansion rate is low, the defects of the casting are reduced, and the size precision is improved; (3) The angular coefficient is low, the grain shape is round, and the air permeability and the surface precision of the casting are improved; (4) The strength is high, the crushing rate is low, the material is repeatedly recycled, the energy is saved, the environment is protected, and the emission of solid waste is reduced; (5) Low bulk density, reduced resin consumption, and improved tensile and bending strength of sand mold.
2. Compared with the silica sand, the ceramsite sand prepared by the method has the performance obviously superior to that of the traditional silica sand in the aspects of crushing wear rate, pressure resistance, casting tensile strength, bending strength and the like. Therefore, the sand is a substitute far superior to silica sand and can be used for replacing imported CB sand in the casting field. Specifically, the method comprises the following steps: (1) After being ground for 1 hour by a GMS5-2 pot mill, the crushing wear rate of the silica sand is 2.47 percent, while the crushing wear rate of the ceramsite sand prepared by the method is only 0.06 percent, and the crushing wear resistance is obviously superior to that of the silica sand. (2) Putting into a pressure tester for 2 minutes, increasing the pressure to 69Mpa, maintaining the pressure for 2 minutes, changing the AFS fineness of the silica sand from 47.2 to 54.8, and having a large fineness change range; the ceramsite AFS prepared by the method is changed from 66.5 to 66.8 and is basically unchanged, the granularity of the sand is basically unchanged, and the compression resistance of the ceramsite sand is obviously superior to that of silica sand. (3) The silicon sand/ceramsite sand provided by the invention is used for 3D printing of a test piece, and under the condition of the same curing agent, binder and addition amount, the tensile strength and the bending strength of the test piece prepared from the ceramsite sand are respectively more than 2 times of those of the silicon sand.
In conclusion, the invention provides the ceramsite sand for high-end casting (3D printing), which has the advantages of high refractoriness, high strength, low breakage rate, low thermal expansion rate, high casting precision, high regeneration utilization rate, spherical sand, angle form coefficient smaller than 1.1 (good casting fluidity and excellent process performance), good air permeability and low stacking density (1.4 g/m) 3 -1.6g/m 3 ) The casting method has the advantages that the casting method can be used for replacing silica sand and imported CB sand to be applied in the casting field, the casting requirement is met, and the economic cost of a casting enterprise can be effectively reduced. The ceramsite sand prepared by the method is suitable for various sand mold casting process fields such as self-hardening furan resin sand, alkaline phenolic resin sand, precoated sand, cold box resin sand, 3D printing and the like, and is applied to manufacturing high-end precision castings such as aviation, ships, 3D printing and the like.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail below with reference to specific embodiments.
The invention discloses ceramsite sand for high-end casting, which is prepared from the following raw materials in parts by weight: waste fly ash, aluminum-containing tailing waste, bauxite and a composite additive; the composite additive comprises manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide which are mixed uniformly in advance. Preferably, the mixing mass ratio of the waste fly ash, the aluminum-containing tailing waste, the bauxite and the composite additive is 4-6:2-4:8-12.
The composite additive can achieve a good technical effect as long as the composite additive contains the components of manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide, and can greatly improve the refractoriness of the prepared ceramsite sand, improve the compressive strength, reduce the breakage rate, reduce the expansion rate and the like, and improve the tensile strength and the bending strength of the casting. Preferably, the mass ratio of the manganese ore powder, the clinker, the ferric oxide, the silicon oxide and the titanium oxide is 1-50:50-100:1-50:1-50:1-50.
In the raw material composition, the main component of the waste fly ash is SiO 2 、Al 2 O 3 C, etc.; the main component of the aluminum-containing tailing fertilizer is that the main component of the fertilizer mainly contains Al 2 O 3 、TiO 2 And also contains Fe 2 O 3 Etc.; the main component of bauxite is Al 2 O 3 . Clinker in the composite additive is clay calcined at high temperature and mainly plays a role of a binder; manganese ore powder and iron oxide (Fe) 2 O 3 ) The combination can enhance the compressive strength of the ceramsite sand and reduce the pulverization rate. Silicon oxide (SiO) 2 ) Mainly plays a role in forming a mixed structure of a quartz phase and a glass phase and promoting pore formation. Titanium oxide (TiO) 2 ) The refractory temperature of the ceramsite sand can be improved by combining the refractory temperature-increasing agent with the ferric oxide, so that the ceramsite sand and a casting adapt to a high-temperature environment, and the refractory degree of the ceramsite sand is mainly improved. The waste fly ash, the waste material containing the aluminum tailings and the composite additive can be used for preparing the ceramsite sand containing a large amount of mixed tissues of mullite phase, quartz phase and glass phase, the waste fly ash and the waste material containing the aluminum tailings are used for replacing high-quality bauxite, the using amount of the high-quality bauxite is reduced, and the bauxite resources are protected. The waste fly ash is recycled, and the environmental pollution can be reduced. The waste aluminum-containing tailings are subjected to reduction and harmless treatment to avoid stackingThe land occupation and the environmental pollution caused by the accumulation are reduced.
The following are specific examples of the present invention.
Example 1
The embodiment provides ceramsite sand for high-end casting, which is prepared from the following raw materials in parts by weight: 4 parts of waste fly ash, 4 parts of aluminum-containing tailing waste, 12 parts of bauxite and 2 parts of a compound additive. The composite additive is prepared from manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide according to the weight ratio of 1: 2: and 4, mixing the components in a mass ratio of.
The preparation steps of the high-end ceramsite sand for casting in the embodiment are as follows:
(1) The waste fly ash, the aluminum-containing tailing waste, the bauxite and the composite additive are uniformly mixed, and then air separation ball milling is carried out to separate dry powder with the particle size of 500-800 meshes.
(2) And adding water into the dry powder, uniformly mixing to obtain wet materials, fully mixing the wet materials with the water content of 20%, granulating, and adding a certain amount of dry powder in the granulating process. In the granulating process, the initial rotation speed of a granulator is 5000r/min, the mixture is mixed for 2min, then the rotation speed is adjusted to 4000/min, the mixture is mixed for 3min, shaping is carried out for 2h after the granulation is finished, and then primary ceramsite sand products with the granularity of 0.075-0.212mm are screened from the shaped ceramsite.
(3) And drying the primary ceramsite sand at 120 ℃ for 0.5h, then roasting at 1400 ℃ for 10h, and finally cooling to obtain the high-end ceramsite sand for casting.
Example 2
The embodiment provides ceramsite sand for high-end casting, which is prepared from the following raw materials in parts by weight: 4 parts of waste fly ash, 4 parts of aluminum-containing tailing waste, 12 parts of bauxite and 2 parts of a compound additive. The composite additive is prepared from manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide according to a weight ratio of 1: 2: and 4, mixing the components in a mass ratio of.
The preparation steps of the high-end ceramsite sand for casting in the embodiment are as follows:
(1) Preparing a mixture: the waste fly ash, the aluminum-containing tailing waste, the bauxite and the composite additive are uniformly mixed, then ball milling is carried out, and dry powder with the particle size of 500-800 meshes is air-separated.
(2) Aging and homogenizing: and adding water into the dry powder material, mixing to obtain a wet material, controlling the water content in the wet material to be 20%, and standing the mixed wet material for 3 days.
(3) And (3) granulating: crushing the aged wet material into powder, adding dry powder during crushing, and granulating in a rotary granulator. In the granulating process, detecting the moisture content and roundness of the granules at intervals of 60min, and adding water or adjusting the working parameters of a rotary granulator according to the detected moisture content and roundness to prepare the primary ceramsite sand product with the angle form coefficient of less than 1.1 and the particle size distribution range of 0.075-0.212 mm.
(4) And drying the primary ceramsite sand at 120 ℃ for 0.5h, roasting at 1400 ℃ for 12h, and finally cooling to obtain the high-end ceramsite sand for casting.
Example 3
The embodiment provides ceramsite sand for high-end casting, which is prepared from the following raw materials in parts by weight: 6 parts of waste fly ash, 3 parts of aluminum-containing tailing waste, 8 parts of bauxite and 3 parts of a compound additive. The composite additive is prepared from manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide according to the weight ratio of 5: 2: 10. See example 2 for the preparation method.
Example 4
The embodiment provides ceramsite sand for high-end casting, which is prepared from the following raw materials in parts by weight: 5 parts of waste fly ash, 3 parts of aluminum-containing tailing waste, 10 parts of bauxite and 2 parts of a compound additive. The composite additive is prepared from manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide according to the weight ratio of 10: 10:20 and 10 by mass ratio. See example 2 for the preparation method.
Example 5
The embodiment provides ceramsite sand for high-end casting, which is prepared from the following raw materials in parts by weight: 5 parts of waste fly ash, 3 parts of aluminum-containing tailing waste, 10 parts of bauxite and 2 parts of composite additive. The composite additive is prepared from manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide in a proportion of 5: 10:20 and 10 by mass ratio.
(1) Preparing a mixture: the waste fly ash, the aluminum-containing tailing waste, the bauxite and the composite additive are uniformly mixed, then ball milling is carried out, and dry powder with the particle size of 500-800 meshes is air-separated.
(2) Aging and homogenizing: and adding water into the dry powder, mixing to obtain a wet material, controlling the water content in the wet material to be 18%, and standing the mixed wet material for 3 days.
(3) And (3) granulating: crushing the aged wet material into powder, adding dry powder during crushing, and granulating in a rotary granulator. In the granulating process, detecting the moisture content and roundness of the granules at intervals of 60min, and adding water or adjusting the working parameters of a rotary granulator according to the detected moisture content and roundness to prepare the primary ceramsite sand with the angle form coefficient of less than 1.1 and the particle size distribution range of 0.075-0.212 mm.
(4) And drying the primary ceramsite sand at 120 ℃ for 1h, roasting at 1550 ℃ for 10h, and finally cooling to obtain the high-end ceramsite sand for casting.
Example 6
The embodiment provides ceramsite sand for high-end casting, which is prepared from the following raw materials in parts by weight: 6 parts of waste fly ash, 4 parts of aluminum-containing tailing waste, 12 parts of bauxite and 3 parts of a composite additive. The composite additive is prepared from manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide according to the weight ratio of 1: 20:20 and (3) mixing the components in a mass ratio of 20. See example 5 for the preparation method.
Example 7
The embodiment provides ceramsite sand for high-end casting, which is prepared from the following raw materials in parts by weight: 4 parts of waste fly ash, 2 parts of aluminum-containing tailing waste, 8 parts of bauxite and 2 parts of a composite additive. The composite additive is prepared from manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide according to the weight ratio of 50: 20: and (3) mixing the components in a mass ratio of 50. See example 5 for the preparation method.
Example 8
The embodiment provides ceramsite sand for high-end casting, which is prepared from the following raw materials in parts by weight: 6 parts of waste fly ash, 2 parts of aluminum-containing tailing waste, 10 parts of bauxite and 3 parts of a composite additive. The composite additive is prepared from manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide according to the weight ratio of 10: 50:1 and 50 by mass ratio. See example 5 for the preparation method.
Comparative example 1
The comparative example provides ceramsite sand for high-end casting, and the raw materials of the ceramsite sand comprise the following raw materials in parts by weight: 4 parts of waste fly ash, 4 parts of aluminum-containing tailing waste, 12 parts of bauxite and 2 parts of clinker. In this example, no complex additive was used. See example 2 for preparation.
Comparative example 2
The comparative example is based on example 2, and the composition of the composite additive is changed as follows: manganese ore powder, clinker, iron oxide and silicon oxide are mixed according to the weight ratio of 1: 2:4: in a mass ratio. The composite additive does not contain titanium oxide.
Comparative example 3
The comparative example is based on example 2, and the composition of the composite additive is changed as follows: clinker, iron oxide, silicon oxide and titanium oxide in a ratio of 50:2: and 4, mixing the components in a mass ratio of. The composite additive does not contain manganese ore powder.
Comparative example 4
The comparative example is based on example 2, and the composition of the composite additive is changed as follows: manganese ore powder, clinker, silicon oxide and titanium oxide are mixed according to the weight ratio of 1: and 4, mixing the components in a mass ratio of. The composite additive does not contain ferric oxide.
Comparative example 5
The comparative example is based on example 2, and the composition of the composite additive is changed as follows: manganese ore powder, clinker, iron oxide and titanium oxide are mixed according to the weight ratio of 1: and 2, mixing the components in a mass ratio of. The composite additive does not contain silicon oxide.
The performance tests were performed on the above-described examples 1 to 8 and comparative examples 1 to 5 and conventional silica sand, and the test items and methods were as follows:
(1) Crushing wear rate experiment: a certain amount of sand to be tested was placed in a jar mill for 1 hour (GMS 5-2 jar mill), taken out and weighed, and the breakage rate was calculated.
(2) And (3) pressure resistance experiment: putting a certain amount of sand to be tested into a pressure tester, increasing the pressure to 69Mpa for 2min, maintaining the pressure for 2min, and then removing the pressure. Sand grains were tested for AFS fineness.
(3) Casting a test piece, and testing the tensile strength and the bending strength of the test piece:
mixing a sulfonic acid curing agent and ceramsite sand in advance, wherein the using amount of the curing agent is 38% of the adding amount of the resin; the curing agent and furan resin form a binder; the binder is used for increasing the bonding strength among the ceramsite sand. The binder accounts for 0.1 percent and 1.05 percent of the mass of the sand respectively, and two test pieces are obtained by casting. Test piece 24h tensile and flexural strength. The test results are summarized in the following table:
group of Breakage rate Fineness of AFS Tensile strength 0.1％ Bending resistance 0.1％ Tensile strength 1.05％ Bending resistance 1.05％
Example 1 0.26％ 67.1→68.4 1.98Mpa 1.14MPa 2.4MPa 1.25MPa
Example 2 0.14％ 67.0→68.0 2.10MPa 1.17MPa 2.7MPa 1.47MPa
Example 3 0.15％ 66.8→67.9 2.21MPa 1.15MPa 2.6MPa 1.45MPa
Example 4 0.11％ 66.6→67.4 2.34MPa 1.22MPa 3.1MPa 1.55Mpa
Example 5 0.06％ 66.5→66.8 2.5MPa 1.30MPa 3.2MPa 1.61Mpa
Example 6 0.08％ 66.6→67.1 2.30Mpa 1.24Mpa 3.1Mpa 1.49Mpa
Example 7 0.09％ 66.8→67.8 2.16Mpa 1.19Mpa 2.9Mpa 1.44Mpa
Example 8 0.12％ 66.6→67.5 2.08Mpa 1.18Mpa 2.7Mpa 1.38Mpa
Comparative example 1 3.68％ 47.7→54.9 1.41Mpa 0.74Mpa 1.8Mpa 0.98Mpa
Comparative example 2 1.45％ 66.5→67.4 1.78Mpa 1.04Mpa 2.2Mpa 1.15Mpa
Comparative example 3 2.08％ 48.3→54.4 1.52Mpa 0.85Mpa 1.9Mpa 1.04Mpa
Comparative example 4 1.99％ 48.8→55.2 1.54Mpa 0.89Mpa 2.0Mpa 1.07Mpa
Comparative example 5 2.01％ 48.6→55.0 1.75Mpa 1.06MPa 2.1MPa 1.10MPa
Silica sand 2.47％ 47.2→54.8 1.3MPa 0.6MPa 1.7MPa 0.9MPa
As seen from the above examples, example 1 was prepared using the inventive furnish, but using conventional techniques. Examples 2-8 were prepared using the preparation methods and conditions of the present invention. Finally, the ceramsite sand prepared in example 1 was superior to the comparative examples 1-5 and silica sand, while the ceramsite sand prepared in examples 2-8 was superior to example 1. The ceramsite sand prepared in example 5 has the best performance in all aspects, and compared with the traditional silica sand, the anti-crushing and anti-abrasion performance of the ceramsite sand is obviously superior to that of the silica sand. In the pressure resistance, the AFS of the ceramsite sand prepared in example 5 is changed from 66.5 to 66.8 and is basically unchanged, the granularity of the sand is basically unchanged, and the pressure resistance of the ceramsite sand for high-end casting (3D printing) is obviously superior to that of silica sand. The tensile strength and the bending strength of the casting cast by the ceramsite sand prepared by the method are 2 times of those of the casting cast by the silica sand.
In addition, the refractory degree of the ceramsite sand prepared by the method is 1790-1900 ℃, and the bulk density is 1.4-1.6g/cm 3 . In the comparative example 1, only clinker is added as a binder when the ceramsite sand is prepared, and a composite additive is not added, so that the tensile strength and the bending strength of a casting are greatly reduced, and the pulverization rate is high; the absence of titanium oxide in the additive package of comparative example 2 resulted in a decrease in the refractory temperature of the ceramsite sand and the casting. The composite additive of comparative example 3 lacks manganese ore powder, so that the refractory temperature of ceramsite sand is reduced, and the compressive strength of a casting is reduced (the pulverization rate of sand is increased); the compound additive of comparative example 4 lacks iron oxide, which results in increased pulverization rate of ceramsite sand and decreased compressive strength and bending strength of castings; the absence of silica in the additive package of comparative example 5 results in a decrease in the compressive strength of the casting.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (3)

1. A preparation method of ceramsite sand for high-end casting is characterized by comprising the following steps:
s1, preparing a mixture: respectively grinding the waste fly ash, the aluminum-containing tailing waste, the bauxite and the composite additive to obtain powder with the particle size of more than or equal to 800 meshes, and mixing to obtain dry powder; wherein the composite additive comprises manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide which are mixed uniformly in advance;
the mixing mass ratio of the waste fly ash, the aluminum-containing tailing waste, the bauxite and the composite additive is 4-6:2-4:8-12: in the composite additive, the mass ratio of manganese ore powder, clinker, ferric oxide, silicon oxide and titanium oxide is 1-50:50-100:1-50:1-50:1 to 50;
s2, ageing and homogenizing: adding water into the dry powder material, mixing to obtain a wet material, controlling the water content in the wet material to be 16-20%, and standing the mixed wet material for 2-3 days;
s3, granulating: crushing the aged wet material into powder, adding dry powder during crushing, and granulating in a rotary granulator to obtain ceramsite sand primary product;
detecting the moisture content and roundness of the granules at intervals of 30-60min in the granulating process, adding water or adjusting the working parameters of a rotary granulator according to the detected moisture content and roundness to prepare a primary ceramsite sand product with an angle form coefficient of less than 1.1 and a particle size distribution range of 0.075-0.212 mm;
s4, calcining: and drying and calcining the primary ceramsite sand at 1350-1550 ℃ for 10-15h to obtain the high-end ceramsite sand for casting.
2. The method of claim 1, wherein in step S3, after the completion of the granulation, the primary ceramsite sand is classified and sieved to obtain a plurality of primary ceramsite sand products with different grade size distributions.
3. High-end foundry ceramsite sand prepared by the preparation method according to claim 1 or 2.
CN202210364866.5A 2022-04-07 2022-04-07 Ceramsite sand for high-end casting and preparation method thereof Active CN114773071B (en)

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CN105618667B (en) * 2015-12-30 2018-12-14 韶关市晟发有色金属有限公司 A kind of fire resisting casting sand
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