CN114409425B - Preparation method of sludge-based porous high-water-absorption ceramsite - Google Patents
Preparation method of sludge-based porous high-water-absorption ceramsite Download PDFInfo
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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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- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/131—Inorganic additives
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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
- C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
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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
- C04B33/1328—Waste materials; Refuse; Residues without additional clay
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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
- C04B33/1355—Incineration residues
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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
- C04B33/138—Waste materials; Refuse; Residues from metallurgical processes, e.g. slag, furnace dust, galvanic waste
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- C04B33/00—Clay-wares
- C04B33/32—Burning methods
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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
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/36—Glass starting materials for making ceramics, e.g. silica glass
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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
Abstract
The invention discloses a preparation method of sludge-based porous high-water-absorption ceramsite, which takes sludge and household garbage incinerator slag as main raw materials, and adds a proper amount of glass powder, wherein the mass ratio of main components is regulated and controlled as follows: siO (SiO) 2 /Al 2 O 3 ＝2.3～3.4，(SiO 2 +Al 2 O 3 )/(CaO+K 2 O+MgO) =1.7-3.8 to control the liquid phase production amount during roasting, so as to raise the cylinder pressure strength of haydite and lower the roasting temperature. The household garbage incinerator slag, the sludge, the glass powder and the water which meet the mass ratio of the components are uniformly mixed, granulated and dried, and then baked for 20-50 min at the temperature of 1000-1080 ℃ to obtain the ceramsite with excellent performance. The invention has the advantages of simple process, low production cost, high resource utilization rate, environmental protection and the like, not only can synchronously realize thorough detoxification and resource efficient utilization of sludge, but also can provide raw materials for the ceramsite industry and reduce the dependence on natural raw materials.
Description
Technical Field
The invention belongs to the field of water pollution purification materials, relates to sludge recycling, and in particular relates to a preparation method of sludge-based porous high-water-absorption ceramsite, which realizes heavy metal solidification and recycling of sludge.
Background
Municipal sludge is a byproduct of sewage plants that is produced during the treatment of municipal domestic and industrial wastewater with a large amount of pollutants. From the appearance, the urban sludge is black or black brown semi-fluid or mud cake-shaped floccule, is zoogloea formed by mud sand, fiber, animal and plant residues and various microorganisms, and contains heavy metals such as copper, arsenic, lead, zinc, chromium, cadmium and the like and organic and inorganic pollution components which are difficult to degrade. The water-retaining agent is characterized in that (1) the water content is very high, the water-retaining capacity is strong, and the compression dehydration is difficult; (2) the stability is extremely poor, the quality is easy to be changed, and malodor is generated; (3) exhibiting a flocculent state between the fluid and the colloid, poor flowability; (4) contains various heavy metal components, and the simple treatment can cause heavy metal pollution; (5) the yield is large, the treatment cost is high, and the treatment cost accounts for 30-40% of the sewage treatment cost.
The ceramsite is prepared from SiO 2 And Al 2 O 3 The bulk density of the raw material as the main component obtained by high-temperature roasting is less than 1200kg/m 3 Porous lightweight aggregate of (a). The composite material has the characteristics of low density, high strength, low water absorption, heat preservation, heat insulation, shock resistance, fire resistance and the like, and has wide market application and huge potential in recent years. The porous water treatment ceramsite can be used as a water treatment filter material, an adsorbent and a permeable pavement material instead of common sand stone, can be used as a culture medium for soilless culture in agriculture and gardens, and can be used as building materials such as bridge decks, hollow building blocks and the like, the water absorption rate of the ceramic particles prepared from the sludge is lower than 7%, the porosity is lower, and the prior art on how to prepare the porous water treatment ceramsite with the porosity of more than 50% and the water absorption rate of more than 50% by utilizing municipal sludge and slag has not been reported yet.
Disclosure of Invention
The invention aims to provide a preparation method of sludge-based porous high-water-absorption ceramsite, which takes municipal sludge and household garbage slag as main raw materials, and adds glass powder to prepare the porous high-water-absorption ceramsite, so that the problem of sewage sludge treatment of the existing municipal sewage treatment plant can be effectively solved, the problem of environmental pollution of sewage sludge can be effectively solved, and the new application of the sludge and slag is expanded.
The core innovation point of the invention is that the raw materials are selected, the household garbage incinerator slag and municipal sludge are taken as main materials, wherein the municipal sludge contains more than 50% of organic matters, and according to the characteristic, the resource utilization of the household garbage incinerator slag and municipal sludge can be realized without adding pore-forming agents into the raw materials. According to the invention, the sludge is used as a foaming agent in the sintering process of the ceramic particles, the sludge and the slag are in synergistic effect, under the presintering and roasting mechanism, the glass powder is added to enable enough liquid phases to be generated in the roasting process, the generated gas is wrapped, the gas is left in the ceramic particles to form more holes, and finally, the ceramic particles have higher porosity and water absorption rate.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the preparation method of the sludge-based porous high-water-absorption ceramsite comprises the steps of 30-65wt% of sludge, 5-40wt% of garbage incinerator slag and 20-40wt% of glass powder in a ceramsite raw material; the main components and the contents (see table 1) of the raw materials before the ceramsite roasting are respectively as follows: al (Al) 2 O 3 The content is 11-17 wt percent, siO 2 35 to 40 weight percent of MgO, 2.5 to 3.5 weight percent of CaO, 10 to 24 weight percent of CaO and K 2 The content of O is 1-2 wt% and the content of the rest substances is 5-10 wt%.
The preparation method comprises the following specific processes:
s1: drying the sludge to constant weight;
s2: crushing and ball milling sludge and slag, and sieving with a 200-mesh sieve;
s3: respectively weighing corresponding sludge, slag, glass powder and starch according to the proportion, and ball milling and mixing;
s4: adding 40-60% deionized water into the uniformly mixed raw materials, and aging;
s5: granulating the raw materials after ageing in a granulator, wherein the diameter of the ceramsite ranges from 5 mm to 9mm;
s6: putting the rubbed haydite into a baking oven for drying;
s7: roasting the dried ceramsite in a muffle furnace, cooling and taking out;
s8: and (5) testing the performance of the ceramsite.
Preferably, the municipal sludge content is 55-65wt% and the garbage incinerator slag content is 5-20wt%.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the household garbage slag and the sludge as the main raw materials and glass powder as the auxiliary materials to prepare the ceramsite, which has simple process and low cost, and can fully utilize the slag and the sludge. The waste is turned into wealth, precious resources such as clay, shale and the like are saved, a large amount of emission and accumulation of slag and sludge are avoided, the environmental pollution is reduced, the purposes of recycling, harmlessness and reduction of solid wastes are really achieved, and the waste is turned into wealth. From the viewpoint of raw materialsSince the sludge contains a large amount of organic matters, a large amount of gas is generated in the sintering process, and therefore, the ceramic particles with excellent pore-forming effect can be obtained without using a foaming agent. The water-treated ceramic particle has water absorption up to 69.45%, porosity up to 58.84% and specific surface area greater than 3.8X10 4 cm 2 And/g, compared with other solid waste ceramsite, the porous ceramic has better pore-forming effect and higher water absorption.
The invention takes sludge and household garbage incinerator slag as main raw materials, and adds a proper amount of glass powder, and the mass ratio of the main components is regulated and controlled as follows: siO (SiO) 2 /Al 2 O 3 ＝2.3～3.4，(SiO 2 +Al 2 O 3 )/(CaO+K 2 O+MgO) =1.7-3.8 to control the liquid phase production amount during roasting, so as to raise the cylinder pressure strength of haydite and lower the roasting temperature. The household garbage incinerator slag, the sludge, the glass powder and the water which meet the mass ratio of the components are uniformly mixed, granulated and dried, and then baked for 20-50 min at the temperature of 1000-1080 ℃ to obtain the ceramsite with excellent performance. The ceramsite has rough surface and porous inside, can be used as a water treatment filter material, can be used for treating oily sewage after modification, such as edible oil in domestic sewage and sewage of catering industry, has higher waste oil content, and can efficiently adsorb greasy dirt. The invention has the advantages of simple process, low production cost, high resource utilization rate, environmental protection and the like, not only can synchronously realize thorough detoxification and resource efficient utilization of sludge, but also can provide raw materials for the ceramsite industry and reduce the dependence on natural raw materials.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the present application will be clearly and completely described below with reference to examples.
The chemical composition of the raw materials involved in the examples below is shown in table 1.
Table 1: chemical composition of raw materials (wt%)
| Chemical composition | SiO 2 | Al 2 O 3 | MgO | CaO | K 2 O |
| Household garbage incinerator slag | 23.4 | 6.82 | 4.61 | 43.6 | 1.71 |
| Municipal sludge | 28.5 | 23.7 | 2.32 | 8.49 | 1.99 |
| Glass powder | 67.9 | 5.07 | 3.50 | 10.2 | 0.07 |
Example one
The preparation method of the sludge-based porous high-water-absorption ceramsite comprises the following raw materials of 65% of municipal sludge, 5% of garbage incinerator slag and 30% of glass powder;
the method comprises the following steps:
s1: drying the sludge in a drying oven to constant weight, wherein the temperature of the drying oven is 80 ℃, and the drying time is 12 hours;
s2: respectively ball-grinding the dried sludge and slag into powder, sieving with a 200-mesh sieve, wherein the rotating speed of the ball mill is 1500r/min, and the time is 30min;
s3: weighing raw materials with corresponding weight according to the formula proportion, and ball-milling and uniformly mixing, wherein the rotating speed of the ball mill is 800r/min, and the time is 5min;
s4: pouring the uniformly mixed raw materials into a grinding pot, adding 50% deionized water, uniformly mixing, and aging for 20min;
s5: granulating the raw materials after ageing in a granulator, wherein the diameter of the ceramsite ranges from 5 mm to 9mm;
s6: drying the formed ceramsite in a drying oven at 80 ℃ for 3 hours;
s7: roasting the dried ceramsite in a muffle furnace at a preheating temperature of 400 ℃ for 10min and a heating rate of 5 ℃/min, and roasting at a roasting temperature of 1030 ℃ for 30min and a heating rate of 10 ℃/min; then taking out the ceramsite when the furnace temperature is naturally cooled to room temperature;
s8: the ceramic granules obtained by firing in this example were subjected to a performance test, wherein the water absorption rate for 1 hour was 69.45% and the specific surface area was 3.79×10 4 cm 2 And/g, the porosity is 58.84%, the hydrochloric acid solubility is 0.7%, and the requirements of CJ/T299-2008 on main performance standards of the water treatment ceramsite filter material are met. In addition, the leaching concentration of heavy metals, the content of soluble chlorine, sulfide and sulfate and the radioactivity are all lower than the national standard limit value.
Example two
The preparation method of the sludge-based porous high-water-absorption ceramsite comprises the following raw materials of 55% of sludge, 15% of slag and 30% of glass powder;
the method comprises the following steps:
s1: drying the sludge in a drying oven to constant weight, wherein the temperature of the drying oven is 80 ℃, and the drying time is 12 hours;
s2: respectively ball-grinding the dried sludge and slag into powder, sieving with a 200-mesh sieve, wherein the rotating speed of the ball mill is 1500r/min, and the time is 30min;
s3: weighing raw materials with corresponding weight according to the formula proportion, and ball-milling and uniformly mixing, wherein the rotating speed of the ball mill is 800r/min, and the time is 5min;
s4: pouring the uniformly mixed raw materials into a grinding pot, adding 50% deionized water, uniformly mixing and ageing for 2 hours;
s5: granulating the raw materials after ageing in a granulator, wherein the diameter of the ceramsite ranges from 5 mm to 9mm;
s6: drying the formed ceramsite in a drying oven at 80 ℃ for 3 hours;
s7: roasting the dried ceramsite in a muffle furnace at a preheating temperature of 400 ℃ for 10min and a heating rate of 5 ℃/min, and roasting at a roasting temperature of 1050 ℃ for 30min and a heating rate of 10 ℃/min; then taking out the ceramsite when the furnace temperature is naturally cooled to room temperature;
s8: the ceramic granules obtained by firing in this example were subjected to a performance test, in which the water absorption was 62.39% and the specific surface area was 3.17X10 4 cm 2 And/g, the porosity is 52.34%, the hydrochloric acid solubility is 0.9%, and the requirements of CJ/T299-2008 on main performance standards of the water treatment ceramsite filter material are met. In addition, the leaching concentration of heavy metals, the content of soluble chlorine, sulfide and sulfate and the radioactivity are all lower than the national standard limit value.
Example three
The preparation method of the sludge-based porous high-water-absorption ceramsite comprises the following raw materials of 30% of municipal sludge, 40% of garbage incinerator slag and 30% of glass powder;
the method comprises the following steps:
s1: drying the sludge in a drying oven to constant weight, wherein the temperature of the drying oven is 80 ℃, and the drying time is 12 hours;
s2: respectively ball-grinding the dried sludge and slag into powder, sieving with a 200-mesh sieve, wherein the rotating speed of the ball mill is 1500r/min, and the time is 30min;
s3: weighing raw materials with corresponding weight according to the formula proportion, and ball-milling and uniformly mixing, wherein the rotating speed of the ball mill is 800r/min, and the time is 5min;
s4: pouring the uniformly mixed raw materials into a grinding pot, adding 50% deionized water, uniformly mixing, and aging for 20min;
s5: granulating the raw materials after ageing in a granulator, wherein the diameter of the ceramsite ranges from 5 mm to 9mm;
s6: drying the formed ceramsite in a drying oven at 80 ℃ for 3 hours;
s7: roasting the dried ceramsite in a muffle furnace at a preheating temperature of 400 ℃ for 10min and a heating rate of 5 ℃/min, and roasting at a roasting temperature of 1000 ℃ for 20min and a heating rate of 10 ℃/min; then taking out the ceramsite when the furnace temperature is naturally cooled to room temperature;
s8: the ceramic granules obtained by firing in this example were subjected to a performance test, wherein the water absorption rate for 1 hour was 50.34% and the specific surface area was 2.53×10 4 cm 2 And/g, the porosity is 51.13%, the hydrochloric acid solubility is 1.1%, and the requirements of CJ/T299-2008 on main performance standards of the water treatment ceramsite filter material are met. In addition, the leaching concentration of heavy metals, the content of soluble chlorine, sulfide and sulfate and the radioactivity are all lower than the national standard limit value.
Comparative example 1
The comparative example uses molybdenum tailings to replace waste incineration slag on the basis of the first example, and the raw materials comprise 65% of sludge, 5% of molybdenum tailings and 30% of glass powder.
Table 2: chemical composition of raw materials (wt%)
| Chemical composition | SiO 2 | Al 2 O 3 | MgO | CaO | K 2 O |
| Molybdenum tailings | 68.8 | 14.3 | 0.668 | 2.01 | 6.31 |
The method comprises the following steps:
s1: drying the sludge in a drying oven to constant weight, wherein the temperature of the drying oven is 80 ℃, and the drying time is 12 hours;
s2: respectively ball-grinding the dried sludge and molybdenum tailings into powder, sieving with a 200-mesh sieve, wherein the rotating speed of the ball mill is 1500r/min, and the time is 30min;
s3: weighing raw materials with corresponding weight according to the formula proportion, and ball-milling and uniformly mixing, wherein the rotating speed of the ball mill is 800r/min, and the time is 5min;
s4: pouring the uniformly mixed raw materials into a grinding pot, adding 50% deionized water, uniformly mixing and ageing for 2 hours;
s5: granulating the raw materials after ageing in a granulator, wherein the diameter of the ceramsite ranges from 5 mm to 9mm;
s6: drying the formed ceramsite in a drying oven at 80 ℃ for 3 hours;
s7: roasting the dried ceramsite in a muffle furnace at a preheating temperature of 400 ℃ for 10min and a heating rate of 5 ℃/min, and roasting at a roasting temperature of 1030 ℃ for 30min and a heating rate of 10 ℃/min; then taking out the ceramsite when the furnace temperature is naturally cooled to room temperature;
s8: the ceramic granules obtained by firing in this example were subjected to a performance test, in which the water absorption was 36.71% and the specific surface area was 1.97X10 4 cm 2 Per g, porosity 41.23%, hydrochloric acid may be usedThe dissolution rate was 1.2%.
As can be seen from the above-described test results,
comparative example 2
In the comparative example, on the basis of the first example, attapulgite is used for replacing waste incineration slag, and the raw materials comprise 65% of sludge, 5% of attapulgite and 30% of glass powder;
table 3: chemical composition of raw materials (wt%)
| Chemical composition | SiO 2 | Al 2 O 3 | MgO | CaO | K 2 O |
| Attapulgite | 63.6 | 15.2 | 4.51 | 5.49 | 1.7 |
The method comprises the following steps:
s1: drying the sludge in a drying oven to constant weight, wherein the temperature of the drying oven is 80 ℃, and the drying time is 12 hours;
s2: respectively ball-grinding the dried sludge and the attapulgite into powder, sieving with a 200-mesh sieve, wherein the rotating speed of the ball mill is 1500r/min, and the time is 30min;
s3: weighing raw materials with corresponding weight according to the formula proportion, and ball-milling and uniformly mixing, wherein the rotating speed of the ball mill is 800r/min, and the time is 5min;
s4: pouring the uniformly mixed raw materials into a grinding pot, adding 50% deionized water, uniformly mixing and ageing for 2 hours;
s5: granulating the raw materials after ageing in a granulator, wherein the diameter of the ceramsite ranges from 5 mm to 9mm;
s6: drying the formed ceramsite in a drying oven at 80 ℃ for 3 hours;
s7: roasting the dried ceramsite in a muffle furnace at a preheating temperature of 400 ℃ for 10min and a heating rate of 5 ℃/min, and roasting at a roasting temperature of 1030 ℃ for 30min and a heating rate of 10 ℃/min; then taking out the ceramsite when the furnace temperature is naturally cooled to room temperature;
s8: the sintered ceramic particles of this example were subjected to a performance test, in which the water absorption was 26.64% and the specific surface area was 1.56X10 4 cm 2 Per g, a porosity of 36.87% and a hydrochloric acid solubility of 1.4%.
The invention is applicable to the prior art where it is not described.
Claims (5)
1. A preparation method of a sludge-based porous high-water-absorption ceramsite is characterized by comprising the following steps: the municipal sludge and the household garbage incinerator slag are used as raw materials, glass powder is added, wherein the municipal sludge content is 55-65wt%, the household garbage incinerator slag content is 5-40wt% and the glass powder content is 20-40wt%, and the mass ratio of the main components is regulated and controlled to be: siO (SiO) 2 /Al 2 O 3 ＝2.3～3.4，(SiO 2 +Al 2 O 3 )/(CaO+K 2 O+mgo) =1.7 to 3.8 to control the amount of liquid phase produced during the firing, thereby increasing the cylinder pressure of the ceramic grains and reducing the firing temperature; uniformly mixing household garbage incinerator slag, municipal sludge, glass powder and water which meet the mass ratio of the components, granulating, drying, and roasting at 1000-1080 ℃ for 20-50 min to obtain porous water treatment ceramsite with the porosity of more than 50% and the water absorption rate of more than 50%;
the porous water treatment ceramsite has a water absorption rate of 51.34-69.45% and a specific surface area of 2.4-3.8X10 after 1h 4 cm 2 The porosity is 51.13-58.84%, the hydrochloric acid solubility is 0.7-1.1%, and the heavy metal leaching concentration, the soluble chlorine content, the sulfide and sulfate content and the radioactivity in the ceramsite are all lower than the national standard limit;
the chemical composition of the raw materials is as follows:
2. the method of manufacturing according to claim 1, characterized in that: municipal sludge and household garbage incinerator slag are used as raw materials, and auxiliary material glass powder is added; the main components and the contents of the raw materials before the ceramic grain roasting are respectively as follows: al (Al) 2 O 3 The content is 11-17 wt percent, siO 2 35 to 40 weight percent of MgO, 2.5 to 3.5 weight percent of CaO, 10 to 24 weight percent of CaO and K 2 The content of O is 1-2 wt% and the content of the rest substances is 5-10 wt%.
3. A preparation method of a sludge-based porous high-water-absorption ceramsite is characterized by comprising the following steps: the municipal sludge content in the ceramsite raw material is 55-65wt%, the garbage incinerator slag is 5-40wt% and the glass powder is 20-40wt%; the main components and the contents of the raw materials before the ceramic grain roasting are respectively as follows: al (Al) 2 O 3 The content is 11-17 wt percent, siO 2 35 to 40 weight percent of MgO, 2.5 to 3.5 weight percent of CaO, 10 to 24 weight percent of CaO and K 2 The O content is 1-2 wt%, and the content of the rest substances is 5-10 wt%; the municipal sludge contains more than 50% of organic matters;
the preparation method comprises the following specific processes:
s1: drying municipal sludge to constant weight;
s2: crushing and ball milling municipal sludge and slag, and sieving with a 200-mesh sieve;
s3: respectively weighing corresponding municipal sludge, slag, glass powder and starch according to a proportion, and ball-milling and mixing;
s4: adding 40-60% deionized water into the uniformly mixed raw materials, and aging;
s5: granulating the raw materials after ageing in a granulator, wherein the diameter of the ceramsite ranges from 5 mm to 9mm;
s6: putting the rubbed haydite into a baking oven for drying;
s7: roasting the dried ceramsite in a muffle furnace at a preheating temperature of 400 ℃ for 10min and a heating rate of 5 ℃/min, wherein the roasting temperature is 1000-1080 ℃; roasting time is 20-50 min, and heating rate is 10 ℃/min; then taking out the ceramsite when the furnace temperature is naturally cooled to room temperature;
the chemical composition of the raw materials is as follows:
4. a method of preparation according to claim 3, characterized in that: the municipal sludge content is 55-65wt% and the garbage incinerator slag content is 5-20wt%.
5. A ceramsite, characterized in that it is obtained by the method according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210091176.7A CN114409425B (en) | 2022-01-26 | 2022-01-26 | Preparation method of sludge-based porous high-water-absorption ceramsite |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210091176.7A CN114409425B (en) | 2022-01-26 | 2022-01-26 | Preparation method of sludge-based porous high-water-absorption ceramsite |
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| Publication Number | Publication Date |
|---|---|
| CN114409425A CN114409425A (en) | 2022-04-29 |
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