CN115259814B - Preparation method of baking-free aggregate of waste stone powder of artificial stone and prepared baking-free aggregate - Google Patents
Preparation method of baking-free aggregate of waste stone powder of artificial stone and prepared baking-free aggregate Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the field of building materials, in particular to a preparation method of an artificial stone waste stone powder baking-free aggregate and the prepared baking-free aggregate, wherein the preparation method comprises the following steps: (1) 80-95 parts of waste stone powder of artificial stone are dried, ball milling is carried out to complete homogenization, and then 1-3 parts of slaked lime is added to uniformly mix to complete modification, thus obtaining modified waste stone powder; (2) Fully mixing the modified waste stone powder with 2-8 parts of mineral powder, 1-3 parts of steel slag, 1-3 parts of kaolin, 1-3 parts of fly ash and 1-3 parts of gypsum to obtain a mixture; (3) putting the mixture into a granulator for granulation; (4) screening the particles to obtain a first aggregate and a second aggregate; (5) And curing the first aggregate and the second aggregate to obtain a finished product. The baking-free aggregate with the advantages of light texture, excellent mechanical property and the like is prepared by the processes of physical modification, aging, chemical modification, raw material mixing, high-speed granulation, low-temperature maintenance and the like.
Description
Technical Field
The invention relates to the field of building materials, in particular to a preparation method of an artificial stone waste stone powder baking-free aggregate and the prepared baking-free aggregate.
Background
Along with the continuous development of stone industry, stone processing enterprises are more and more remained, and particularly stone powder generated after stone sawing is accumulated and piled up into mountains over the years, occupies land and pollutes the environment. With the deep concept of saving resources and protecting environment, the country has also put higher demands on the environmental protection of enterprises. The waste stone powder for artificial stone is different from natural waste stone powder, and contains a great amount of additives such as aluminum hydroxide, calcium carbonate, silicon oxide, flame retardant, stabilizer, antioxidant, pigment and the like. Is mainly used as concrete admixture, stone-like paint and the like at present.
The artificial stone waste stone powder is used as an admixture for concrete, the addition amount is generally less than 25%, and the comprehensive utilization rate is low. The Chinese patent with the application number of 201711331265.X discloses application of waste stone powder in stone factories in concrete, wherein the waste stone powder in stone factories is compounded with China hemp fibers and then is used as an additive to be added into the concrete, and the concrete with high strength, good freezing resistance, small drying shrinkage, difficult cracking, antibacterial property and heat resistance can be prepared. The addition amount of the waste stone powder is less than 5%, so that the comprehensive utilization rate of the waste stone powder of the artificial stone is very low. In addition, the presence of various additives can also have an effect on the stability of the concrete.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method of an artificial stone waste stone powder baking-free aggregate, which is prepared by physically and chemically modifying the artificial stone waste stone powder and has the advantages of light texture, excellent mechanical property and the like, and the specific technical scheme is as follows:
the preparation method of the baking-free aggregate of the waste stone powder of the artificial stone comprises the following steps:
(1) 80-95 parts of waste stone powder of artificial stone are dried, ball milling is carried out to complete homogenization, and then 1-3 parts of slaked lime is added to uniformly mix to complete modification, thus obtaining modified waste stone powder;
(2) Fully mixing the modified waste stone powder with 2-8 parts of mineral powder, 1-3 parts of steel slag, 1-3 parts of kaolin, 1-3 parts of fly ash and 1-3 parts of gypsum to obtain a mixture;
(3) Granulating the mixture in a granulator;
(4) Screening the particles to obtain a first aggregate and a second aggregate;
(5) And curing the first aggregate and the second aggregate to obtain a finished product.
Further, the specific surface area of the mineral powder, the kaolin, the fly ash and the gypsum is 500-600m 2 /kg。
Further, the gypsum is one or two of desulfurized gypsum and phosphogypsum.
Further, the surface area of the steel slag is 600-700m 2 /kg。
Further, the particle size of the first aggregate is more than 4.78mm, the particle size of the second aggregate is less than or equal to 4.78mm, the first aggregate is coarse aggregate, and the second aggregate is fine aggregate.
Further, the rotating speed of the granulator is 1000-3000r/min.
Further, the curing temperature is 20-50 ℃ and the curing time is 3-28 days.
Further, in the step (2), a coloring material may be added. When the pigment is added, the coarse aggregate can be used as colored stone, and the fine aggregate can be used as colored sand; when no pigment is added, the coarse aggregate can be used as ceramsite, and the fine aggregate can be used as synthetic sand. Specifically, the specific surface area of the pigment is more than or equal to 600m 2 /kg。
The baking-free aggregate for the waste stone powder of the artificial stone is prepared by the preparation method of the baking-free aggregate for the waste stone powder of the artificial stone.
The preparation method of the baking-free aggregate of the waste stone powder of the artificial stone and the prepared baking-free aggregate have the following beneficial effects:
(1) The invention carries out chemical modification on the waste stone powder of the artificial stone by adding a proper amount of slaked lime, so that the whole body of the waste stone powder of the artificial stone is alkaline, and SiO in the waste stone powder of the artificial stone 2 And Al 2 O 3 The isostructure is excited to dissociate to form more silicate ions and aluminate ions, and after encountering calcium ions, amorphous aluminosilicate gel is finally formed through a series of reactions, so that the strength of the aggregate is improved. In addition, the organic additive existing in the waste stone powder of the artificial stone is modified and decomposed under the alkaline condition, therebyThe influence of various additives in the waste stone powder on the aggregate performance is reduced.
(2) The invention carries out physical modification on the waste stone powder of the artificial stone by a ball milling method, is beneficial to homogenizing the waste stone powder of the artificial stone and improves the mechanical strength of aggregate products. The components of the artificial stone are different in each batch, the components of the generated waste stone powder are greatly different, a large amount of gap moisture can be entrained in the process of the production, and the semi-dry waste stone powder filter cake can be obtained after filter pressing and airing. The invention repeatedly receives the action of grinding pressure stress by ball milling the dried waste stone powder, so that inherent or newly generated cracks on the surface of the particles expand, and then the cracks are crushed or plastically deformed, and the waste stone powder with different components is homogenized.
(3) The invention adopts mineral powder, steel slag, gypsum, fly ash, kaolin and other auxiliary agents to compound the waste stone powder of the main raw material artificial stone. The waste stone powder of the artificial stone is pretreated by chemical modification to obtain alkaline powder in a fluffy state, and auxiliary agents such as mineral powder, steel slag, gypsum, fly ash, kaolin and the like can be added to compound gypsum to perform pozzolan reaction and ettringite reaction, and the aggregate with excellent mechanical properties is obtained through high-speed granulation and low-temperature solidification.
(4) The waste stone powder baking-free aggregate for the artificial stone has the advantages of light weight, excellent mechanical property and the like, can effectively replace natural aggregate, and is applied to the fields of structural concrete, decorative concrete, lightweight concrete, artificial stone and the like. Meanwhile, the problems that the waste polishing powder of the artificial stone is difficult to utilize, the environment is polluted and the like are solved, and the recycling utilization of the waste stone powder of the artificial stone is realized.
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings which are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a preparation method of the baking-free aggregate of the waste stone powder of the artificial stone.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1
As shown in fig. 1, the preparation method of the baking-free aggregate of the waste stone powder of the artificial stone comprises the following steps:
(1) 80 parts of artificial stone waste stone powder is dried, ball milling is carried out to complete homogenization, and then 3 parts of slaked lime is added to uniformly mix to complete modification, so as to obtain modified waste stone powder;
(2) Fully mixing the modified waste stone powder with 8 parts of mineral powder, 1 part of steel slag, 3 parts of kaolin, 3 parts of fly ash and 3 parts of gypsum to obtain a mixture;
(3) Granulating the mixture in a granulator;
(4) Screening the particles to obtain a first aggregate and a second aggregate;
(5) And curing the first aggregate and the second aggregate to obtain a finished product.
Further, the specific surface area of the mineral powder, the kaolin, the fly ash and the gypsum is 500-600m 2 /kg。
Further, the gypsum is desulfurized gypsum.
Further, the surface area of the steel slag is 600-700m 2 /kg。
Further, the particle size of the first aggregate is more than 4.78mm, the particle size of the second aggregate is less than or equal to 4.78mm, the first aggregate is coarse aggregate, and the second aggregate is fine aggregate.
Further, the rotational speed of the granulator is 2000r/min.
Further, the curing temperature was 50℃and the curing time was 7 days.
Example 2
The preparation method of the baking-free aggregate of the waste stone powder of the artificial stone comprises the following steps:
(1) Drying 85 parts of waste stone powder of the artificial stone, performing ball milling to complete homogenization, and adding 3 parts of slaked lime to uniformly mix to complete modification to obtain modified waste stone powder;
(2) Fully mixing the modified waste stone powder with 5 parts of mineral powder, 3 parts of steel slag, 1 part of kaolin, 2 parts of fly ash and 3 parts of gypsum to obtain a mixture;
(3) Granulating the mixture in a granulator;
(4) Screening the particles to obtain a first aggregate and a second aggregate;
(5) And curing the first aggregate and the second aggregate to obtain a finished product.
Further, the specific surface area of the mineral powder, the kaolin, the fly ash and the gypsum is 500-600m 2 /kg。
Further, the gypsum is one or two of desulfurized gypsum.
Further, the surface area of the steel slag is 600-700m 2 /kg。
Further, the particle size of the first aggregate is more than 4.78mm, the particle size of the second aggregate is less than or equal to 4.78mm, the first aggregate is coarse aggregate, and the second aggregate is fine aggregate.
Further, the rotational speed of the granulator is 3000r/min.
Further, the curing temperature was 40℃and the curing time was 3 days.
Example 3
The preparation method of the baking-free aggregate of the waste stone powder of the artificial stone comprises the following steps:
(1) Drying 90 parts of waste stone powder of the artificial stone, performing ball milling to complete homogenization, and adding 2 parts of slaked lime to uniformly mix to complete modification to obtain modified waste stone powder;
(2) Fully mixing the modified waste stone powder with 3 parts of mineral powder, 1 part of steel slag, 1 part of kaolin, 1 part of fly ash and 3 parts of gypsum to obtain a mixture;
(3) Granulating the mixture in a granulator;
(4) Screening the particles to obtain a first aggregate and a second aggregate;
(5) And curing the first aggregate and the second aggregate to obtain a finished product.
Further, the specific surface area of the mineral powder, the kaolin, the fly ash and the gypsum is 500-600m 2 /kg。
Further, the gypsum is desulfurized gypsum.
Further, the surface area of the steel slag is 600-700m 2 /kg。
Further, the particle size of the first aggregate is more than 4.78mm, the particle size of the second aggregate is less than or equal to 4.78mm, the first aggregate is coarse aggregate, and the second aggregate is fine aggregate.
Further, the rotational speed of the granulator is 3000r/min.
Further, the curing temperature was 30℃and the curing time was 14 days.
Example 4
(1) Drying 92 parts of waste stone powder of the artificial stone, performing ball milling to complete homogenization, and adding 1.5 parts of slaked lime to uniformly mix to complete modification to obtain modified waste stone powder;
(2) Fully mixing the modified waste stone powder with 3 parts of mineral powder, 1 part of steel slag, 1 part of kaolin, 1 part of fly ash and 2.5 parts of gypsum to obtain a mixture;
(3) Granulating the mixture in a granulator;
(4) Screening the particles to obtain a first aggregate and a second aggregate;
(5) And curing the first aggregate and the second aggregate to obtain a finished product.
Further, the specific surface area of the mineral powder, the kaolin, the fly ash and the gypsum is 500-600m 2 /kg。
Further, the gypsum is phosphogypsum.
Further, the surface area of the steel slag is 600-700m 2 /kg。
Further, the particle size of the first aggregate is more than 4.78mm, the particle size of the second aggregate is less than or equal to 4.78mm, the first aggregate is coarse aggregate, and the second aggregate is fine aggregate.
Further, the rotational speed of the granulator is 3000r/min.
Further, the curing temperature was 25℃and the curing time was 28 days.
Example 5
The preparation method of the baking-free aggregate of the waste stone powder of the artificial stone comprises the following steps:
(1) Drying 95 parts of waste stone powder of the artificial stone, performing ball milling to complete homogenization, and adding 1 part of slaked lime to uniformly mix to complete modification to obtain modified waste stone powder;
(2) Fully mixing the modified waste stone powder with 2 parts of mineral powder, 1 part of steel slag, 1 part of kaolin, 1 part of fly ash and 2 parts of gypsum to obtain a mixture;
(3) Granulating the mixture in a granulator;
(4) Screening the particles to obtain a first aggregate and a second aggregate;
(5) And curing the first aggregate and the second aggregate to obtain a finished product.
Further, the specific surface area of the mineral powder, the kaolin, the fly ash and the gypsum is 500-600m 2 /kg。
Further, the gypsum is phosphogypsum.
Further, the surface area of the steel slag is 600-700m 2 /kg。
Further, the particle size of the first aggregate is more than 4.78mm, the particle size of the second aggregate is less than or equal to 4.78mm, the first aggregate is coarse aggregate, and the second aggregate is fine aggregate.
Further, the rotational speed of the granulator is 3000r/min.
Further, the curing temperature was 30℃and the curing time was 7 days.
Comparative example 1
Compared with the example 1, the comparative example only differs in that no slaked lime is added, and the specific technical scheme is as follows:
the preparation method of the baking-free aggregate of the waste stone powder of the artificial stone comprises the following steps:
(1) 80 parts of artificial stone waste stone powder is dried and then ball-milled to complete homogenization, so as to obtain modified waste stone powder;
(2) Fully mixing the modified waste stone powder with 8 parts of mineral powder, 1 part of steel slag, 3 parts of kaolin, 3 parts of fly ash and 3 parts of gypsum to obtain a mixture;
(3) Granulating the mixture in a granulator;
(4) Screening the particles to obtain a first aggregate and a second aggregate;
(5) And curing the first aggregate and the second aggregate to obtain a finished product.
Further, the specific surface area of the mineral powder, the kaolin, the fly ash and the gypsum is 500-600m 2 /kg。
Further, the gypsum is desulfurized gypsum.
Further, the surface area of the steel slag is 600-700m 2 /kg。
Further, the particle size of the first aggregate is more than 4.78mm, the particle size of the second aggregate is less than or equal to 4.78mm, the first aggregate is coarse aggregate, and the second aggregate is fine aggregate.
Further, the rotational speed of the granulator is 2000r/min.
Further, the curing temperature was 50℃and the curing time was 7 days.
Comparative example 2
Compared with the example 1, the comparative example only differs in that the artificial stone waste stone powder is not subjected to ball milling, and the specific technical scheme is as follows:
the preparation method of the baking-free aggregate of the waste stone powder of the artificial stone comprises the following steps:
(1) Drying 80 parts of waste stone powder of the artificial stone, adding 3 parts of slaked lime, and uniformly mixing to finish modification to obtain modified waste stone powder;
(2) Fully mixing the modified waste stone powder with 8 parts of mineral powder, 1 part of steel slag, 3 parts of kaolin, 3 parts of fly ash and 3 parts of gypsum to obtain a mixture;
(3) Granulating the mixture in a granulator;
(4) Screening the particles to obtain a first aggregate and a second aggregate;
(5) And curing the first aggregate and the second aggregate to obtain a finished product.
Further, the specific surface area of the mineral powder, the kaolin, the fly ash and the gypsum is 500-600m 2 /kg。
Further, the gypsum is desulfurized gypsum.
Further, the surface area of the steel slag is 600-700m 2 /kg。
Further, the particle size of the first aggregate is more than 4.78mm, the particle size of the second aggregate is less than or equal to 4.78mm, the first aggregate is coarse aggregate, and the second aggregate is fine aggregate.
Further, the rotational speed of the granulator is 2000r/min.
Further, the curing temperature was 50℃and the curing time was 7 days.
Coarse aggregate and fine aggregate prepared in the above examples and comparative examples were tested, and table 1 shows coarse aggregate test results and table 2 shows fine aggregate test results.
TABLE 1
| Group of | Barrel pressure strength/MPa | Water absorption/% | Bulk density/kg/m 3 |
| Example 1 | 9.3 | 9.8 | 923 |
| Example 2 | 8.6 | 10.9 | 904 |
| Example 3 | 7.3 | 12.8 | 889 |
| Example 4 | 6.7 | 14.2 | 870 |
| Example 5 | 5.9 | 15.0 | 858 |
| Comparative example 1 | 4.5 | 16.1 | 921 |
| Comparative example 2 | 3.8 | 20.4 | 841 |
TABLE 2
| Group of | Crush value/% | Water absorption/% | Bulk density/kg/m 3 |
| Example 1 | 4.2 | 12.0 | 859 |
| Example 2 | 4.9 | 13.9 | 853 |
| Example 3 | 5.8 | 15.7 | 848 |
| Example 4 | 6.5 | 17.5 | 836 |
| Example 5 | 7.7 | 18.0 | 825 |
| Comparative example 1 | 7.9 | 15.9 | 857 |
| Comparative example 2 | 12.0 | 25.0 | 825 |
As shown by the test results of the coarse aggregate and the fine aggregate prepared in the examples 1-5, the waste stone powder baking-free aggregate prepared by the invention has the advantages of high compressive strength, low bulk density, light weight, excellent mechanical property and the like.
As a result of testing the baking-free aggregate prepared in comparative examples 1 and 1, the aggregate performance of example 1 was superior to that of comparative example 1, and it was found that the addition of slaked lime made the entirety of the waste stone powder of the artificial stone alkaline and the SiO in the waste stone powder of the artificial stone 2 And Al 2 O 3 The isostructure is excited to dissociate to form more silicate ions and aluminate ions, and after encountering calcium ions, amorphous aluminosilicate gel is finally formed through a series of reactions, so that the strength of the aggregate is improved.
The test results of the baking-free aggregate prepared in comparative examples 1 and 2 show that the aggregate performance of example 1 is better than that of comparative example 2, and therefore, the ball milling method is used for physically modifying the waste stone powder of the artificial stone, so that the homogenization of the waste stone powder of the artificial stone is facilitated, and the mechanical strength of the aggregate product is improved. According to the invention, the dried waste stone powder is subjected to ball milling and repeatedly subjected to the action of grinding pressure stress, so that inherent or newly generated cracks on the surface of the particles are expanded, and then the cracks are crushed or plastically deformed, so that the waste stone powder with different components is homogenized, and the mechanical strength of the product is improved.
Claims (8)
1. The preparation method of the baking-free aggregate of the waste stone powder of the artificial stone is characterized by comprising the following steps:
(1) 80-95 parts of waste stone powder of artificial stone are dried, ball milling is carried out to complete homogenization, and then 1-3 parts of slaked lime is added to uniformly mix to complete modification, thus obtaining modified waste stone powder;
(2) Fully mixing the modified waste stone powder with 2-8 parts of mineral powder, 1-3 parts of steel slag, 1-3 parts of kaolin, 1-3 parts of fly ash and 1-3 parts of gypsum to obtain a mixture;
(3) Granulating the mixture in a granulator;
(4) Screening the particles to obtain a first aggregate and a second aggregate;
(5) And curing the first aggregate and the second aggregate to obtain a finished product.
2. The method for preparing the baking-free aggregate of the waste stone powder of the artificial stone according to claim 1, wherein the specific surface area of the mineral powder, the kaolin, the fly ash and the gypsum is 500-600m 2 /kg。
3. The method for preparing the baking-free aggregate of the waste stone powder of the artificial stone according to claim 2, wherein the gypsum is one or two of desulfurized gypsum and phosphogypsum.
4. The method for preparing the baking-free aggregate of the waste stone powder of the artificial stone according to claim 1, wherein the surface area of the steel slag is 600-700m 2 /kg。
5. The method for preparing the baking-free aggregate of the waste stone powder of the artificial stone according to claim 1, wherein the particle size of the first aggregate is more than 4.78mm, and the particle size of the second aggregate is less than or equal to 4.78mm.
6. The method for preparing the baking-free aggregate of the waste stone powder of the artificial stone according to claim 1, wherein the rotating speed of the granulator is 1000-3000r/min.
7. The method for preparing the baking-free aggregate of the waste stone powder of the artificial stone according to claim 1, wherein the curing temperature is 20-50 ℃ and the curing time is 3-28 days.
8. An artificial stone waste stone powder baking-free aggregate, which is characterized by being prepared by the preparation method of the artificial stone waste stone powder baking-free aggregate according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110484019.8A CN115259814B (en) | 2021-04-30 | 2021-04-30 | Preparation method of baking-free aggregate of waste stone powder of artificial stone and prepared baking-free aggregate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110484019.8A CN115259814B (en) | 2021-04-30 | 2021-04-30 | Preparation method of baking-free aggregate of waste stone powder of artificial stone and prepared baking-free aggregate |
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| Publication Number | Publication Date |
|---|---|
| CN115259814A CN115259814A (en) | 2022-11-01 |
| CN115259814B true CN115259814B (en) | 2023-07-28 |
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| CN1584208A (en) * | 2003-08-20 | 2005-02-23 | 王永新 | Constructing method for improving lime industry slag base course by solution method |
| CN107619235A (en) * | 2017-10-09 | 2018-01-23 | 大连地拓环境科技有限公司 | A kind of golden mine tailing is granulated water-permeable brick and preparation method thereof |
| CN112661430A (en) * | 2020-12-25 | 2021-04-16 | 建华建材（中国）有限公司 | Irregular light aggregate and concrete containing same |
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| GB2318115A (en) * | 1996-08-01 | 1998-04-15 | Cintag Limited | Lightweight aggregate from fly ash and coal tailings |
| CN105366975A (en) * | 2015-11-30 | 2016-03-02 | 武汉天意成再生资源有限公司 | Non-calcinated solid waste high-activity mineral admixture and preparation method therefor |
| CN107445556B (en) * | 2017-09-08 | 2020-04-17 | 济南大学 | Granite waste stone powder ceramsite pervious concrete and preparation method thereof |
| CN109796189B (en) * | 2019-04-04 | 2022-03-08 | 内江师范学院 | Water permeable brick prepared from building wastes and preparation method thereof |
| CN110510898A (en) * | 2019-09-24 | 2019-11-29 | 厦门高时实业有限公司 | Water-permeable brick made of pervious surface aggregate made of a kind of solid waste and the aggregate |
| CN111116070A (en) * | 2019-12-19 | 2020-05-08 | 广东清大同科环保技术有限公司 | Baking-free aggregate prepared from iron tailings and preparation method thereof |
| CN111205003B (en) * | 2020-01-19 | 2021-06-25 | 武汉理工大学 | Preparation method of regenerated cementing material |
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| CN1584208A (en) * | 2003-08-20 | 2005-02-23 | 王永新 | Constructing method for improving lime industry slag base course by solution method |
| CN107619235A (en) * | 2017-10-09 | 2018-01-23 | 大连地拓环境科技有限公司 | A kind of golden mine tailing is granulated water-permeable brick and preparation method thereof |
| CN112661430A (en) * | 2020-12-25 | 2021-04-16 | 建华建材（中国）有限公司 | Irregular light aggregate and concrete containing same |
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