CN111517820A - High-strength ceramsite containing sludge ash and preparation method thereof - Google Patents
High-strength ceramsite containing sludge ash and preparation method thereof 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/009—Porous or hollow ceramic granular materials, e.g. microballoons
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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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
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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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/135—Combustion residues, e.g. fly ash, incineration waste
- C04B33/1355—Incineration residues
- C04B33/1357—Sewage sludge ash or slag
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of artificial lightweight aggregates, and particularly relates to high-strength ceramsite containing sludge ash and a preparation method thereof. The raw materials of the ceramsite comprise 10-90 wt% of sludge ash and 10-90 wt% of engineering waste soil; the preparation method of the ceramsite comprises the following steps: s1, crushing and mixing sludge ash and engineering waste soil according to the proportion; s2, grinding the mixture to 80 mu m with 15-30 percent of screen residue, and preparing raw material spheres with the size of 5-20mm by using a disc granulator; s3, drying the raw material spheres; s4, putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from room temperature to 200 ℃, and then preserving the heat; then raising the temperature from 200 ℃ to 600-700 ℃ and then preserving the heat; finally, the temperature is raised to 1080-1200 ℃, the temperature is preserved for 20-30min, and then the product is naturally cooled to the normal temperature. The invention solves the problem that the municipal sludge cannot be mixed with a large amount of high-strength ceramsite due to high water content and high organic matter content.
Description
Technical Field
The invention belongs to the technical field of artificial lightweight aggregates, and particularly relates to high-strength ceramsite containing sludge ash and a preparation method thereof.
Background
Ceramsite is a lightweight aggregate produced by foaming in a rotary kiln. It has the advantages of spherical shape, smooth and hard surface, honeycomb shape inside, low density, low heat conductivity and high strength. In the refractory industry, ceramsite is mainly used as aggregate of heat-insulating refractory material.
At present, the preparation raw material of the ceramsite is mainly clay or shale, and as the clay is a precious natural resource, the clay ceramsite is developed vigorously, which inevitably causes the damage and loss of a large amount of high-quality cultivated land; the shale is used for producing ceramsite, which can destroy natural vegetation and environment and break the balance of an ecological system to a certain extent.
In addition, the preparation method also comprises other preparation methods:
for example, Chinese patent application No. 200910156987.5 discloses a method for preparing ceramsite by mixing and roasting 30-45% of municipal sludge, 20-40% of fly ash and 20-40% of river bottom sludge, wherein the volume weight of the ceramsite is less than or equal to 700Kg/m3, the cylinder pressure strength is 6.8-7.0MPa, and the water absorption rate is less than or equal to 1.0.
For example, chinese patent application No. 201811583149.1 discloses a pore-controllable sludge soil-based ceramsite, which is prepared from the following raw materials in percentage by weight: 45-55% of municipal sludge with water content of 45-45%, 30-40% of muck, 5-10% of shale, 2% of rice husk, 4-6% of pore regulator and 0.2-2% of fluxing agent. The water absorption of the ceramsite is 9.3-11.2%, the cylinder pressure strength is 2.3-2.7MPa, and the bulk density is 580 kg/m3And (4) obtaining a finished product.
For example, Chinese patent application No. 201610316035.5 discloses a preparation method of lightweight high-strength sludge ceramsite, which comprises 10-25 parts of sawdust, 20-30 parts of fly ash, 5-10 parts of silica fume, 30-40 parts of sludge, 10-15 parts of quicklime, 20-30 parts of red mudstone, 1-5 parts of gypsum, 5-10 parts of magnesite and 1-3 parts of iron powder. The water absorption of the ceramsite is 9.3-11.2%, the cylinder pressure strength is 8.3-8.8MPa, and the bulk density is 522-539kg/m 3.
The requirement of the GB/T17431.1-2010 standard on the high-strength ceramsite is as follows: strength grade is not less than 25MPa, water absorption is not less than 10%, 700Kg/m3Density grade ≦ 1200Kg/m3(ii) a The cylinder pressure strength is not less than 4 MPa; therefore, the preparation method of the ceramsite disclosed by the patent is slightly higher than the standard in cylinder pressure strength, or the utilization rate of the municipal sludge is less than or equal to 55 percent, so that the large-scale use of the municipal sludge is limited; in addition, various auxiliary additives are also added, so that the raw material cost is increased, the uniformity of the raw materials is poor, and the firing of the ceramsite is adversely affected. Therefore, the existing preparation method of the ceramsite must be improved.
Disclosure of Invention
The invention provides a high-strength ceramsite containing sludge ash and a preparation method thereof for solving the technical problems in the known technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides high-strength ceramsite containing sludge ash, which comprises the following raw materials: 10-90% (mass percent) of sludge ash; 10-90% (mass percent) of engineering waste soil;
the sludge ash is prepared by burning municipal sludge, and the loss on ignition is 0-2%; the water content of the municipal sludge for preparing the sludge ash is 80 percent; the sludge ash comprises the following components: 35-45 wt% SiO 2; 18-24 wt% Al2O 3; 10-16% Fe2O 3; 5-8 wt% CaO; 3-6 wt% MgO; 2-4 wt% K2O; 1-3 wt% Na 2O;
the ignition loss of the engineering waste soil is 8-12%, and the water content before incineration is 8-15%; the engineering waste soil comprises the following components: 48-55 wt% SiO2；15-22wt％Al2O3；2-8wt％Fe2O3；2-6wt％CaO；2-5wt％MgO；0-2wt％K2O；0-2wt％Na2O。
Further, the high-strength ceramsite has the following characteristics: water absorption rate less than or equal to 10%, cylinder pressure strength 7.5-17.8MPa, bulk density 763-3。
Furthermore, the amount of the sludge slag after high-temperature calcination is 8-12% of that before calcination.
Further, the invention also discloses a preparation method of the high-strength ceramsite, which mainly comprises the following steps:
s1, crushing 10-90 wt% of sludge ash and 10-90 wt% of engineering waste soil respectively and mixing together;
s2, grinding the mixture in a small ball mill until the 80 mu m screen residue is 15-30%, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 5-20 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from room temperature to 200 ℃, keeping the temperature for 25-35min, and keeping the temperature for 15-25 min; then heating from 200 ℃ to 600 ℃ and 700 ℃, the heating time is 40-50min, and the temperature is kept for 15-30 min; finally, the temperature is raised from 600 ℃ to 700 ℃ to 1080-1200 ℃, the temperature raising time is 55-75min, and the temperature is naturally cooled to the normal temperature after 20-30min of heat preservation.
The invention has the advantages and positive effects that:
1. the sludge ash selected by the invention is the sludge ash obtained by drying the municipal sludge with the water content of 80 percent and burning the dried municipal sludge in the muffle furnace at the high temperature of 800 ℃ as the main raw material to prepare the high-strength ceramsite, thereby solving the problem that the general municipal sludge (with the water content of 80 percent) cannot be used for preparing the high-strength ceramsite in large mixing amount due to the restriction of high water content, high organic matter content and other factors, and eliminating the problem that the organic matter content in the sludge is higher and greatly improving the actual mixing amount of the sludge as the sludge ash after the municipal sludge is calcined at the high temperature is only 8-12 percent of the sludge before the calcination.
2. Under the condition that the doping amount of the sludge ash is 10-90%, the water absorption of the ceramsite is controlled within 10%, and the cylinder pressure strength (7.5-17.8MPa) of the ceramsite is greatly improved. In addition, the invention also fully utilizes a small amount of carbon in the sludge ash, effectively improves the volume weight of the ceramsite, regulates the pore distribution in the ceramsite, and improves the hardness of the surface layer of the ceramsite and reduces the calcination temperature by utilizing the iron element in the sludge ash.
3. The invention provides the preparation of the high-strength ceramsite by using the sludge ash and the engineering waste soil for the first time, solves the influence of the engineering waste soil on urban environment and water and soil loss, fully has good plasticity index, can effectively reduce the difficulty of a pelletizing and granulating process in the preparation process of the ceramsite, saves energy consumption, fully utilizes silicon-aluminum components in the waste clay, and increases the framework strength of the ceramsite.
4. The invention does not need to add other additives such as quartz sand, feldspar and the like, and only utilizes the iron raw material in the sludge ash slag to ensure that the surface texture of the sintered ceramsite is hard, the volume weight is light, the cylinder pressure strength is high, the water absorption rate is low and the like.
5. The high-strength ceramsite can be applied to high-strength structural concrete, prefabricated parts and fabricated buildings, not only harmlessly utilizes solid wastes such as municipal sludge, engineering waste soil and the like, but also reduces the harm to the environment, and has better social benefit and environmental benefit.
Detailed Description
The technical scheme of the invention will be clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; rather than all embodiments. Based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
The invention provides a high-strength ceramsite, which comprises the following raw materials: 10-90 wt% of sludge ash and 10-90 wt% (mass percentage) of engineering waste soil.
The sludge ash is obtained by drying municipal sludge with the water content of 80% at 105 ℃ and then burning the municipal sludge in a muffle furnace at the high temperature of 800 ℃, and the sludge ash mainly contains elements such as silicon, aluminum, iron, calcium, magnesium and the like and contains a small amount of organic carbon which is not burnt out.
The engineering waste soil is a component of construction waste and mainly comes from various large-scale engineering projects such as real estate construction, urban underground traffic construction, underground pipe gallery construction and the like. With the rapid promotion of infrastructure construction in China, the quantity of engineering waste soil in China is increased rapidly in recent years, and a large amount of waste soil is accumulated and is difficult to treat. Because the engineering waste soil is loose in soil quality, steep in accumulation surface and serious in soil erosion, the produced water and soil loss accounts for a large proportion in the whole project, and the engineering waste soil for developing and constructing the project is an important source for newly increasing water and soil loss in cities.
The characteristics of the sludge ash and the engineering waste soil are as follows:
in addition, the water content of the engineering waste soil before incineration is 8-15%.
The invention also discloses a preparation method of the high-strength ceramsite, which mainly comprises the following steps:
s1, crushing 10-90 wt% of sludge ash and 10-90 wt% of engineering waste soil respectively and mixing together;
s2, grinding the mixture in a small ball mill until the 80 mu m screen residue is 15-30%, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 5-20 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from room temperature to 200 ℃, keeping the temperature for 25-35min, and keeping the temperature for 15-25 min; then heating from 200 ℃ to 600 ℃ and 700 ℃, the heating time is 40-50min, and the temperature is kept for 15-30 min; finally, the temperature is raised from 600 ℃ to 700 ℃ to 1080-1200 ℃, the temperature raising time is 55-75min, and the temperature is naturally cooled to the normal temperature after 20-30min of heat preservation.
By the method, the water absorption rate is less than or equal to 10 percent, the cylinder pressure strength is 7.5-17.8MPa, and the bulk density is 763-3The sludge ash content of the high-strength ceramsite finished product after high-temperature calcination is only 8-12% of that before calcination.
In order to further understand the contents, features and effects of the present invention, the following examples are listed:
example 1
S1, crushing 90 wt% of sludge ash and 10 wt% of engineering waste soil respectively and mixing together;
s2, grinding the mixture in a small ball mill until the 80 mu m screen residue is 30 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 5-20 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from room temperature to 200 ℃, heating for 25min, and keeping the temperature for 15 min; heating from 200 deg.C to 600 deg.C for 40min, and maintaining for 15 min; and finally, heating from 600 ℃ to 1080 ℃, heating for 55min, preserving heat for 20min, and naturally cooling to the normal temperature.
Through inspection, the ceramsite product obtained by the scheme is characterized in that: the bulk density was 763kg/m3The cylinder pressure strength is 7.5MPa, and the water absorption rate is 9.63% in 1 h; the amount of sludge and ash after high-temperature calcination is 12.0 percent of that before calcination.
Example 2
S1, crushing 10 wt% of sludge ash and 90 wt% of engineering waste soil respectively and mixing together;
s2, grinding the mixture in a small ball mill until the 80 mu m screen residue is 20 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 5-20 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from room temperature to 200 ℃, heating for 25min, and keeping the temperature for 20 min; heating from 200 deg.C to 700 deg.C for 45min, and maintaining for 20 min; and finally, heating from 700 ℃ to 1200 ℃, heating for 65min, keeping the temperature for 25min, and naturally cooling to the normal temperature.
Through inspection, the ceramsite product obtained by the scheme has the characteristics that: bulk density of 960kg/m3The cylinder pressure strength is 14.6MPa, and the water absorption rate is 2.56% in 1 h; the amount of sludge and ash after high-temperature calcination was 9.4% of that before calcination.
Example 3
S1, respectively crushing 25 wt% of sludge ash and 75 wt% of engineering waste soil, and mixing together;
s2, grinding the mixture in a small ball mill until the sieved residue of 80 mu m is 15 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 5-20 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from room temperature to 200 ℃, keeping the temperature for 35min, and keeping the temperature for 25 min; heating from 200 deg.C to 700 deg.C for 50min, and maintaining for 30 min; and finally, heating from 700 ℃ to 1140 ℃ for 75min, preserving the heat for 30min, and naturally cooling to the normal temperature.
Through inspection, the ceramsite product obtained by the scheme is characterized in that: the bulk density was 1053kg/m3The cylinder pressure strength is 17.8MPa, and the water absorption rate is 0.5% in 1 h; the amount of sludge and ash after high-temperature calcination is 8.0 percent of that before calcination.
Example 4
S1, crushing 50 wt% of sludge ash and 50 wt% of engineering waste soil respectively and mixing together;
s2, grinding the mixture in a small ball mill until the sieved residue of 80 mu m is 20 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 5-20 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from room temperature to 200 ℃, keeping the temperature for 35min, and keeping the temperature for 20 min; heating from 200 deg.C to 600 deg.C for 45min, and maintaining for 25 min; and finally, heating from 600 ℃ to 1100 ℃, heating for 70min, preserving heat for 30min, and naturally cooling to normal temperature.
Through inspection, the ceramsite product obtained by the scheme is characterized in that: the bulk density was 889kg/m3The cylinder pressure strength is 12.4MPa, and the water absorption rate is 3.76% in 1 h; the amount of sludge and ash after high-temperature calcination is 10.3 percent of that before calcination.
The sludge ash selected by the invention is the sludge ash obtained by drying the municipal sludge with the water content of 80 percent and burning the dried municipal sludge in the muffle furnace at the high temperature of 800 ℃ as the main raw material to prepare the high-strength ceramsite, thereby solving the problem that the general municipal sludge (with the water content of 80 percent) cannot be used for preparing the high-strength ceramsite in large mixing amount due to the restriction of high water content, high organic matter content and other factors, and eliminating the problem that the organic matter content in the sludge is higher and greatly improving the actual mixing amount of the sludge because the sludge ash after the sludge (dry basis) is calcined at the high temperature is only 8-12 percent of the sludge ash before the calcination. Compared with the decarbonized coal slime adopted in the prior art, the sludge ash has the following advantages: firstly, the carbon content is less than 2%, which is beneficial to controlling the pore structure in the ceramsite; the cosolvent has high mineral content (Fe2O3, CaO, MgO, K2O and Na2O), and is favorable for reducing the firing temperature of the ceramsite and increasing the thickness of a glass layer on the surface of the ceramsite; good grindability and power consumption saving. The sludge ash contains no moisture and can be ground together with other raw materials, so that the uniformity of raw materials is ensured.
Under the condition that the doping amount of the sludge ash is 10-90%, the water absorption of the ceramsite is controlled within 10%, and the cylinder pressure strength of the ceramsite is improved to 7.5-17.8 MPa. In addition, the invention also fully utilizes a small amount of carbon components in the sludge ash, effectively improves the volume weight and the internal porous structure of the ceramsite, and utilizes iron elements in the sludge ash to improve the hardness of the surface layer of the ceramsite and reduce the calcination temperature.
In addition, the invention firstly provides the method for preparing the high-strength ceramsite by using the sludge ash and engineering waste soil combined ingredient, solves the influence of the engineering waste soil on urban environment and water and soil loss, fully realizes the good plasticity index of the engineering waste soil, can effectively reduce the difficulty of a pelletizing and granulating process in the process of preparing the ceramsite, saves energy consumption, fully utilizes the silicon-aluminum components in the waste clay, and increases the framework strength of the ceramsite.
The invention does not need to add other additives such as quartz sand, feldspar and the like, and only utilizes the iron raw material in the sludge ash slag to ensure that the surface texture of the sintered ceramsite is hard, the volume weight is light, the cylinder pressure strength is high, the water absorption rate is low and the like.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (4)
1. The high-strength ceramsite containing sludge ash is characterized in that the raw materials of the ceramsite comprise 10-90 wt% of sludge ash and 10-90 wt% of engineering waste soil;
the sludge ash is prepared by burning municipal sludge, and the loss on ignition is 0-2%; the water content of the municipal sludge for preparing the sludge ash is 80 percent; the sludge ash comprises the following components: 35-45 wt% SiO 2; 18-24 wt% Al2O 3; 10-16% Fe2O 3; 5-8 wt% CaO; 3-6 wt% MgO; 2-4 wt% K2O; 1-3 wt% Na 2O;
the ignition loss of the engineering waste soil is 8-12%, and the water content before incineration is 8-15%; the engineering waste soil comprises the following components: 48-55 wt% SiO2；15-22wt％Al2O3；2-8wt％Fe2O3；2-6wt％CaO；2-5wt％MgO；0-2wt％K2O；0-2wt％Na2O。
2. The high-strength ceramsite containing sludge ash as claimed in claim 1, wherein the high-strength ceramsite is characterized by comprising the following components in parts by weight: water absorption rate less than or equal to 10%, cylinder pressure strength 7.5-17.8MPa, bulk density 763-3。
3. The high-strength ceramsite containing sludge ash as claimed in claim 1, wherein the high-strength ceramsite comprises: the sludge ash content after high-temperature calcination is 8-12% of that before calcination.
4. The method for preparing high-strength ceramsite containing sludge ash as claimed in any one of claims 1 to 3, wherein the method comprises the following steps:
s1, crushing 10-90 wt% of sludge ash and 10-90 wt% of engineering waste soil respectively and mixing together;
s2, grinding the mixture in a small ball mill until the 80 mu m screen residue is 15-30%, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 5-20 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from room temperature to 200 ℃, keeping the temperature for 25-35min, and keeping the temperature for 15-25 min; then heating from 200 ℃ to 600 ℃ and 700 ℃, the heating time is 40-50min, and the temperature is kept for 15-30 min; finally, the temperature is raised from 600 ℃ to 700 ℃ to 1080-1200 ℃, the temperature raising time is 55-75min, and the temperature is naturally cooled to the normal temperature after 20-30min of heat preservation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112679222A (en) * | 2020-12-09 | 2021-04-20 | 辽宁省环保集团有限责任公司 | Resource disposal method for sludge drying incineration granulation |
| CN115028468A (en) * | 2022-05-27 | 2022-09-09 | 贵州茅台酒股份有限公司 | Ceramsite based on waste pit mud and preparation method thereof |
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| CN115028468A (en) * | 2022-05-27 | 2022-09-09 | 贵州茅台酒股份有限公司 | Ceramsite based on waste pit mud and preparation method thereof |
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