CN111574193A - Sludge ash ceramsite filter material and preparation method thereof - Google Patents
Sludge ash ceramsite filter material and preparation method thereof Download PDFInfo
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- C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D39/00—Filtering material for liquid or gaseous fluids
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- C04B33/13—Compounding ingredients
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- 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
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- 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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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention belongs to the technical field of water pollution purification materials, and particularly relates to a sludge ash ceramsite filter material and a preparation method thereof. The raw materials of the ceramsite filter material comprise 10-40 wt% of sludge ash and 60-90 wt% of engineering waste soil; the preparation method of the ceramsite comprises the following steps: crushing sludge ash and engineering waste soil according to a ratio and mixing; grinding the mixture to 80 μm with a sieve residue of 15% -30%, and granulating with a disc granulator to obtain raw material spheres of 0.5-9.0 mm; drying the raw material spheres, putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from 20 ℃ to 200-700 ℃, and keeping the temperature for 5-15 min; then the temperature is raised to 1050-1150 ℃, and after the temperature is preserved for 5-20min, the mixture is naturally cooled to the normal temperature. The invention utilizes the residual organic carbon in the sludge ash to improve the pore structure in the ceramsite filter material and utilizes elements with the melting assisting function, such as iron, calcium, magnesium and the like in the sludge ash to reduce the firing temperature of the ceramsite filter material.
Description
Technical Field
The invention belongs to the technical field of water pollution purification materials, and particularly relates to a sludge ash ceramsite filter material and a preparation method thereof.
Background
The ceramsite filter material is prepared by taking a silicon-aluminum raw material as a ceramic component, adding a proper amount of binder and additive, mixing ingredients, granulating into balls and roasting, and comprises the following raw materials: clay ceramsite filtering material, shale ceramsite filtering material, fly ash ceramsite filtering material, sludge ceramsite filtering material and the like. The traditional filter material mainly comprises: (1) the inorganic filter materials such as quartz sand, volcanic rock and the like have low specific surface area and less biofilm formation; (2) the organic filtering materials such as glass fiber reinforced plastics, polystyrene and the like have smooth surfaces, poor adhesion of biological membranes, easy aging and high price. Compared with the traditional filter material, the ceramsite filter material has the advantages of multiple micropores, high specific surface area, good membrane-forming performance, strong dirt-intercepting capability and the like, and the raw materials are cheap and easy to obtain. Therefore, the research and development of the high-efficiency and low-cost ceramsite filter material have important significance for the popularization and application of the sewage treatment process of the biological aerated filter.
Chinese patent (application No. 200810230795.X) discloses a method for preparing a ceramsite filter material by mixing 60-80% of waste glass, 25-45% of sludge and 3-10% of additive and then roasting, wherein the volume weight of the ceramsite filter material is 419Kg/m3The compressive strength is 5.2Mpa, and the acid dissolution rate is 9.5 percent. Chinese patent (application No. 201010249977201210159253.4) discloses a ceramsite filter material which is formed by combining and sintering 30-50% of metallurgical comprehensive sludge, 18-30% of coal gangue, 8-20% of metallurgical power plant fly ash and 10-40% of coal powder, wherein the compressive strength of the ceramsite filter material is 10.4-14.1MPa, and the specific surface area is 1-1.96 multiplied by 104cm2The dissolubility rate of hydrochloric acid is 2.24-2.84; chinese patent (application No. 200610010355.4) discloses a ceramsite filter material prepared from 30-40% of shale, 30-45% of fly ash, 10-20% of sludge, 3-8% of pore-forming agent and 0.5-2% of binder. The volume weight of the ceramsite filter material is 900-1200Kg/m3The compressive strength is 5.2MPa, and the specific surface area is 2-15 x 104cm2(ii) in terms of/g. Chinese patent application No. 201510985517.5 discloses a ceramsite filter material prepared by combining 50% of water supply sludge, 25% of sewage sludge and 25% of clay. The volume weight of the ceramsite filter material is 710-3Porosity of 42.3-53.21%, specific surface area of 0.55-0.74 x 104cm2/g。
As the standard of the ceramsite filter material QB/T4383-2012 has specific indexes on the relevant performance of the ceramsite filter material. In summary, the problems of the prior art are as follows:
(1) the cylinder pressure strength of the ceramsite filter material prepared by the prior art can not meet the minimum requirement of being more than or equal to 8MPa in the standard ceramsite filter material QB/T4383-2012, or the specific surface area of the ceramsite filter material can not meet the minimum requirement of being more than or equal to 2 x 10 in the standard after the cylinder pressure strength meets the standard4cm2Or the hydrochloric acid dissolubility rate is 2 percent higher than the maximum value of the standard.
(2) The acid dissolution rate of the ceramsite filter material can not meet the minimum requirement standard requirement of less than or equal to 2 percent in the standard ceramsite filter material QB/T4383-2012.
(3) Wet sludge with the water content of 30-80% is mostly adopted, the usage amount of the sludge is less than or equal to 50%, the dry basis of the sludge is smaller, and the large-scale use of the sludge is limited.
(4) The main raw materials of part of the patents are natural shale and clay, and the natural shale and clay are forbidden to be exploited at home at present. In addition, pore-forming agent and binder are added, which increases the cost of raw materials.
For this reason, the applicant designs and develops difficulties and meanings for solving the above technical problems:
shale and clay are valuable natural resources, so that the vigorous development of the ceramsite filter material can lead to the destruction and loss of a large amount of high-quality cultivated land, and the production of ceramsite by using shale can destroy natural vegetation and environment and break the balance of an ecological system to a certain extent. Therefore, the sludge ash after the municipal sludge incineration and the engineering waste soil are used as main raw materials to prepare the ceramsite filter material, a new way is opened up for the comprehensive utilization of the municipal sludge, the municipal sludge is changed into valuable, and the pollution degree to the environment can be reduced. Meanwhile, the influence of the engineering waste soil on the urban environment and the water and soil loss is also overcome. At present, no public report for preparing the ceramsite filter material by using sludge ash and engineering waste soil as main raw materials is found.
Disclosure of Invention
The invention provides a sludge ash ceramsite filter material and a preparation method thereof, aiming at solving the technical problems in the prior art. The method fully utilizes the residual organic carbon in the sludge ash to improve the pore structure in the ceramsite filter material, and elements with the melting assisting function such as iron, calcium, magnesium and the like in the sludge ash to reduce the firing temperature of the ceramsite filter material; the prepared ceramsite filter material has the advantages of being microporous, high in specific surface area, good in membrane hanging performance, strong in sewage interception capability and the like, and raw materials are cheap and easy to obtain, so that the ceramsite filter material can be applied to urban sewage treatment, water environment treatment and the like. The urban sludge ash and the engineering waste soil are used as main raw materials to prepare the ceramsite filter material, so that the solid waste is harmlessly utilized, the harm to the environment is reduced, and the ceramsite filter material has good social benefit and environmental benefit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the ceramsite filter material comprises the following raw materials of 0-40 wt% of sludge ash and 0-60 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% SiO2；18-24wt％Al2O3；10-16％Fe2O3；5-8wt％CaO；3-6wt％MgO；2-4wt％K2O；1-3wt％Na2O；
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 ceramsite filter material has the following characteristics: the cylinder pressure strength is 8.6-17.0MPa, and the bulk density is 769.2-924.9kg/m3A porosity of 40% or more and a specific surface area of 2 to 10% or more4cm2/g。
Furthermore, the invention also discloses a preparation method of the ceramsite filter material, which mainly comprises the following steps:
s1, crushing 10-40 wt% of sludge ash and 60-90 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 0.5-9.0 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 to 200-700 ℃ from 20 ℃, keeping the temperature for 70-100min, and keeping the temperature for 5-15 min; then heating from 700 ℃ to 1050-1150 ℃, heating for 30-45min, preserving heat for 5-20min, and naturally cooling to normal temperature.
Further, the preparation method of the ceramsite filter material mainly comprises the following steps:
s1, crushing 40 wt% of sludge ash and 60 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 0.5-9.0 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 20 ℃ to 200 ℃, keeping the temperature for 70min, and keeping the temperature for 5 min; then heating from 700 ℃ to 1050 ℃, heating for 30min, preserving heat for 5min, and naturally cooling to normal temperature.
Further, the preparation method of the ceramsite filter material mainly comprises the following steps: s1, crushing 30 wt% of sludge ash and 70 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 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 0.5-9.0 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, drying the raw material spheres in an oven at 105 ℃ for 2 hours, then putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from 20 ℃ to 700 ℃, heating for 85min, and keeping the temperature for 10 min; then heating from 700 ℃ to 1080 ℃ of roasting temperature, heating for 40min, preserving heat for 15min, and naturally cooling to normal temperature.
Further, the preparation method of the ceramsite filter material mainly comprises the following steps:
s1, crushing 20 wt% of sludge ash and 80 wt% of engineering waste soil respectively and mixing together;
s2, grinding the mixture in a small ball mill until the sieved residue of the mixture is 20 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 0.5-9.0 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material balls into a muffle furnace, heating the raw material balls from 20 ℃ to 700 ℃, heating the raw material balls for 90min, preserving the heat for 15min, heating the raw material balls from 700 ℃ to 1110 ℃, heating the raw material balls for 40min, preserving the heat for 15min, and naturally cooling the raw material balls to the normal temperature.
Furthermore, the preparation method of the ceramsite filter material mainly comprises the following steps:
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 15 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 0.5-9.0 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, placing the dried raw material balls into a muffle furnace, heating the raw material balls from 20 ℃ to 700 ℃, heating the raw material balls for 100min, preserving the heat for 15min, heating the raw material balls from 700 ℃ to 1150 ℃ for roasting, heating the raw material balls for 45min, preserving the heat for 20min, and naturally cooling the raw material balls to the normal temperature.
The invention has the advantages and positive effects that:
the sludge ash selected by the invention is a product of municipal sludge burned at 800 ℃ (the weight of the sludge burned is reduced by about 90%), and the sludge ash mainly comprises elements such as silicon, aluminum, iron, calcium and magnesium, wherein the elements of iron, calcium and magnesium can reduce the sintering temperature of the ceramsite filter material, and the cosolvent cost is saved. The sludge ash contains a small amount of unburned organic carbon (0-5%), a small amount of carbon components in the sludge ash are fully utilized, the volume weight and the internal porous structure of the ceramsite are effectively improved, and the additional cost of a pore-forming agent and the like is saved. In addition, the method adopts the decarburized coal in the prior artCompared with sludge, the sludge ash has the advantages of ① percent and carbon content<2% of the total weight of the ceramic particles, ② cosolvent mineral (Fe)2O3，CaO，MgO，K2O，Na2High O) content, favorable for reducing the firing temperature of the ceramsite and increasing the thickness of a vitrification layer on the surface of the ceramsite, good ③ grindability, saving grinding power consumption, no moisture in ④ sludge ash, and capability of grinding together with other raw materials, thereby ensuring the uniformity of raw materials.
Compared with the mixing amount of wet sludge (less than or equal to 50%), the wet sludge mixing amount of the invention can be improved by 25 times, the performance index of the ceramsite filter material meets the relevant regulations in the ceramsite filter material QB/T4383-2012 standard, the cylinder pressure strength of the ceramsite is greatly improved (8.6-17.0MPa), and a new path is provided for large-scale, harmless and high-valued use of the municipal sludge.
The invention firstly provides the preparation of the ceramsite filter material by using the sludge ash and engineering waste soil combined ingredients, solves the influence of the engineering waste soil on the urban environment and the water and soil loss, fully utilizes the good plasticity index of the engineering waste soil, can effectively reduce the difficulty of the pelletizing and granulating process in the preparation process of the ceramsite, saves the energy consumption, fully utilizes the silicon-aluminum components in the waste clay, and increases the strength of the ceramsite filter material.
The invention does not need to add other additives such as cosolvent or pore-forming agent, saves the cost of raw materials and ensures the uniformity and stability of the ceramsite raw material.
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 sludge ash ceramsite filter material, which comprises the following raw materials of 0-40 wt% of sludge ash and 0-60 wt% 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 10-40 wt% of sludge ash and 60-90 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 0.5-9.0 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 to 200-700 ℃ from 20 ℃, keeping the temperature for 70-100min, and keeping the temperature for 5-15 min; then heating from 700 ℃ to 1050-1150 ℃, heating for 30-45min, preserving heat for 5-20min, and naturally cooling to normal temperature.
By the method, the following can be obtainedThe ceramsite filter material is characterized in that: cylinder pressure strength 8.6-17.0MPa, bulk density 769.2-924.9kg/m3A porosity of 40% or more and a specific surface area of 2 to 10% or more4cm2/g。
In order to further understand the contents, features and effects of the present invention, the following examples are listed:
example 1
S1, crushing 40 wt% of sludge ash and 60 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 0.5-9.0 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 20 ℃ to 200 ℃, keeping the temperature for 70min, and keeping the temperature for 5 min; then heating from 700 ℃ to 1050 ℃, heating for 30min, preserving heat for 5min, and naturally cooling to normal temperature.
The characteristics of the ceramsite products obtained according to the above scheme are shown in table 1 below.
TABLE 1 EXAMPLE 1 Haydite Filter Material Performance index
| Serial number | Test items | Test index | Standard middle index | Whether or not to meet the standard |
| 1 | Pile upDensity kg/m3 | 769.2 | Self-defined by owner | |
| 2 | Porosity% | 55 | ≤40 | Qualified |
| 3 | Specific surface area cm2/g | 8.2*104 | ≥2*104 | Qualified |
| 4 | Hydrochloric acid solubility% | 0.80 | ≤2 | Qualified |
| 5 | Content of mud% | 0.42 | ≤1 | Qualified |
| 6 | The sum of the crushing rate and the wear rate% | 1.5 | ≤6 | Qualified |
| 7 | Barrel pressure strength Mpa | 8.6 | ≥8 | Qualified |
Example 2
S1, crushing 30 wt% of sludge ash and 70 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 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 0.5-9.0 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, drying the raw material spheres in an oven at 105 ℃ for 2 hours, then putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from 20 ℃ to 700 ℃, heating for 85min, and keeping the temperature for 10 min; then heating from 700 ℃ to 1080 ℃ of roasting temperature, heating for 40min, preserving heat for 15min, and naturally cooling to normal temperature. The characteristics of the ceramsite products obtained according to the above scheme are shown in table 2 below.
TABLE 2 EXAMPLE 2 Haydite Filter Material Performance index
| Serial number | Test items | Test index | Standard middle index | Whether or not to meet the standard |
| 1 | Bulk density kg/m3 | 812.4 | Self-defined by owner | |
| 2 | Porosity% | 51 | ≤40 | Qualified |
| 3 | Specific surface area cm2/g | 6.5*104 | ≥2*104 | Qualified |
| 4 | Hydrochloric acid solubility% | 0.62 | ≤2 | Qualified |
| 5 | Content of mud% | 0.31 | ≤1 | Qualified |
| 6 | The sum of the crushing rate and the wear rate% | 1.21 | ≤6 | Qualified |
| 7 | Barrel pressure strength Mpa | 12.6 | ≥8 | Qualified |
Example 3
S1, crushing 20 wt% of sludge ash and 80 wt% of engineering waste soil respectively and mixing together;
s2, grinding the mixture in a small ball mill until the sieved residue of the mixture is 20 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 0.5-9.0 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material balls into a muffle furnace, heating the raw material balls from 20 ℃ to 700 ℃, heating the raw material balls for 90min, preserving the heat for 15min, heating the raw material balls from 700 ℃ to 1110 ℃, heating the raw material balls for 40min, preserving the heat for 15min, and naturally cooling the raw material balls to the normal temperature. The characteristics of the ceramsite filter material obtained by the scheme are shown in the following table 3.
TABLE 3 EXAMPLE 3 Haydite Filter Material Performance index
| Serial number | Test items | Test index | Standard middle index | Whether or not to meet the standard |
| 1 | Bulk density kg/m3 | 857.3 | Self-defined by owner | |
| 2 | Porosity% | 47.5 | ≤40 | Qualified |
| 3 | Specific surface area cm2/g | 5.5*104 | ≥2*104 | Qualified |
| 4 | Hydrochloric acid solubility% | 0.46 | ≤2 | Qualified |
| 5 | Content of mud% | 0.38 | ≤1 | Qualified |
| 6 | The sum of the crushing rate and the wear rate% | 0.75 | ≤6 | Qualified |
| 7 | Barrel pressure strength Mpa | 17.0 | ≥8 | Qualified |
Example 4
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 15 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 0.5-9.0 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, placing the dried raw material balls into a muffle furnace, heating the raw material balls from 20 ℃ to 700 ℃, heating the raw material balls for 100min, preserving the heat for 15min, heating the raw material balls from 700 ℃ to 1150 ℃ for roasting, heating the raw material balls for 45min, preserving the heat for 20min, and naturally cooling the raw material balls to the normal temperature. The characteristics of the ceramsite filter material obtained by the scheme are shown in the following table 4.
TABLE 4 EXAMPLE 4 Haydite Filter Material Performance index
| Serial number | Test items | Test index | Standard middle index | Whether or not to meet the standard |
| 1 | Bulk density kg/m3 | 924.9 | Self-defined by owner | |
| 2 | Porosity% | 44.5 | ≤40 | Qualified |
| 3 | Specific surface area cm2/g | 3.5*104 | ≥2*104 | Qualified |
| 4 | Hydrochloric acid solubility% | 0.37 | ≤2 | Qualified |
| 5 | Content of mud% | 0.23 | ≤1 | Qualified |
| 6 | The sum of the crushing rate and the wear rate% | 0.64 | ≤6 | Qualified |
| 7 | Barrel pressure strength Mpa | 14.3 | ≥8 | Qualified |
The sludge ash selected by the invention is a product of municipal sludge burned at 800 ℃ (the weight of the sludge burned is reduced by about 90%), the sludge ash mainly comprises elements such as silicon-aluminum-iron-calcium-magnesium, and the like, wherein the elements such as iron, calcium and magnesium can reduce the burning temperature of a ceramsite filter material, and the cosolvent cost is saved<2% of the total weight of the ceramic particles, ② cosolvent mineral (Fe)2O3，CaO，MgO，K2O，Na2High O) content, favorable for reducing the firing temperature of the ceramsite and increasing the thickness of a vitrification layer on the surface of the ceramsite, good ③ grindability, saving grinding power consumption, no moisture in ④ sludge ash, and capability of grinding together with other raw materials, thereby ensuring the uniformity of raw materials.
Compared with the mixing amount of wet sludge (less than or equal to 50%), the wet sludge mixing amount of the invention can be improved by 25 times, the performance index of the ceramsite filter material meets the relevant regulations in the ceramsite filter material QB/T4383-2012 standard, the cylinder pressure strength of the ceramsite is greatly improved (8.6-17.0MPa), and a new path is provided for large-scale, harmless and high-valued use of the municipal sludge.
The invention firstly provides the preparation of the ceramsite filter material by using the sludge ash and engineering waste soil combined ingredients, solves the influence of the engineering waste soil on the urban environment and the water and soil loss, fully utilizes the good plasticity index of the engineering waste soil, can effectively reduce the difficulty of the pelletizing and granulating process in the preparation process of the ceramsite, saves the energy consumption, fully utilizes the silicon-aluminum components in the waste clay, and increases the strength of the ceramsite filter material.
The invention does not need to add other additives such as cosolvent or pore-forming agent, saves the cost of raw materials and ensures the uniformity and stability of the ceramsite raw material.
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 (7)
1. A sludge ash ceramsite filter material is characterized in that: the raw material formula of the ceramsite filter material comprises 0-40 wt% of sludge ash and 0-60 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% SiO2；18-24wt％Al2O3；10-16％Fe2O3；5-8wt％CaO；3-6wt％MgO；2-4wt％K2O；1-3wt％Na2O；
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 sludge ash ceramsite filter material of claim 1, which is characterized in that: the ceramsite filter material has the following characteristics: the cylinder pressure strength is 8.6-17.0MPa, and the bulk density is 769.2-924.9kg/m3A porosity of 40% or more and a specific surface area of 2 to 10% or more4cm2/g。
3. The method for preparing the sludge ash ceramsite filter material as claimed in claim 1 or 2, is characterized in that: the method comprises the following steps of,
s1, crushing 10-40 wt% of sludge ash and 60-90 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 0.5-9.0 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 to 200-700 ℃ from 20 ℃, keeping the temperature for 70-100min, and keeping the temperature for 5-15 min; then heating from 700 ℃ to 1050-1150 ℃, heating for 30-45min, preserving heat for 5-20min, and naturally cooling to normal temperature.
4. The method for preparing the sludge ash ceramsite filter material as claimed in claim 3, is characterized in that: the method comprises the following steps of,
s1, crushing 40 wt% of sludge ash and 60 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 0.5-9.0 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 20 ℃ to 200 ℃, keeping the temperature for 70min, and keeping the temperature for 5 min; then heating from 700 ℃ to 1050 ℃, heating for 30min, preserving heat for 5min, and naturally cooling to normal temperature.
5. The method for preparing the sludge ash ceramsite filter material as claimed in claim 3, is characterized in that: the method comprises the following steps of,
s1, crushing 30 wt% of sludge ash and 70 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 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 0.5-9.0 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, drying the raw material spheres in an oven at 105 ℃ for 2 hours, then putting the dried raw material spheres into a muffle furnace, heating the raw material spheres from 20 ℃ to 700 ℃, heating for 85min, and keeping the temperature for 10 min; then heating from 700 ℃ to 1080 ℃ of roasting temperature, heating for 40min, preserving heat for 15min, and naturally cooling to normal temperature.
6. The method for preparing the sludge ash ceramsite filter material as claimed in claim 3, is characterized in that: the method comprises the following steps of,
s1, crushing 20 wt% of sludge ash and 80 wt% of engineering waste soil respectively and mixing together;
s2, grinding the mixture in a small ball mill until the sieved residue of the mixture is 20 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 0.5-9.0 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, putting the dried raw material balls into a muffle furnace, heating the raw material balls from 20 ℃ to 700 ℃, heating the raw material balls for 90min, preserving the heat for 15min, heating the raw material balls from 700 ℃ to 1110 ℃, heating the raw material balls for 40min, preserving the heat for 15min, and naturally cooling the raw material balls to the normal temperature.
7. The method for preparing the sludge ash ceramsite filter material as claimed in claim 3, is characterized in that: the method comprises the following steps of,
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 15 percent, and preparing raw material spheres by using a disc granulator, wherein the particle size of the raw material spheres is 0.5-9.0 mm;
s3, drying the raw material spheres in an oven at 105 ℃ for 2 hours;
s4, placing the dried raw material balls into a muffle furnace, heating the raw material balls from 20 ℃ to 700 ℃, heating the raw material balls for 100min, preserving the heat for 15min, heating the raw material balls from 700 ℃ to 1150 ℃ for roasting, heating the raw material balls for 45min, preserving the heat for 20min, and naturally cooling the raw material balls to the normal temperature.
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