CN113880477A - Building ceramsite prepared from fly ash, sludge and slag and preparation process thereof - Google Patents
Building ceramsite prepared from fly ash, sludge and slag and preparation process thereof Download PDFInfo
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- CN113880477A CN113880477A CN202111013424.8A CN202111013424A CN113880477A CN 113880477 A CN113880477 A CN 113880477A CN 202111013424 A CN202111013424 A CN 202111013424A CN 113880477 A CN113880477 A CN 113880477A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 71
- 239000010802 sludge Substances 0.000 title claims abstract description 60
- 239000002893 slag Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000004484 Briquette Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims description 28
- 239000000843 powder Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 238000010304 firing Methods 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 239000002699 waste material Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 13
- 239000010865 sewage Substances 0.000 abstract description 10
- 239000010813 municipal solid waste Substances 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 7
- 239000002910 solid waste Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000002920 hazardous waste Substances 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000004056 waste incineration Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004017 vitrification Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 241000607479 Yersinia pestis Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910001779 copper mineral Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000000528 statistical test Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a building ceramsite prepared from fly ash, sludge and slag and a preparation process thereof, which is a process for harmless and resource waste utilization of fly ash, industrial slag and sludge of a sewage treatment plant generated by garbage incineration, and comprises the steps of washing and drying the fly ash, uniformly mixing the dried fly ash, the dried and ground-into-fine slag, the dried and ground-into-fine sludge and a pore-forming agent according to the parts by weight of 30-70 parts of fly ash, 30-50 parts of sludge, 30-60 parts of slag and 10-30 parts of a pore-forming agent respectively, then adding a proper amount of water, uniformly stirring to form a plastic briquette, processing the briquette into a plurality of spherical blanks with the particle size of 8-15mm, then drying the spherical blanks in an oven at 105 ℃ for 2h, finally transferring the dried spherical blanks into a muffle furnace, preheating for 30 minutes at 450 ℃, then roasting for 10 minutes at the temperature of 1150 ℃, and cooling to room temperature after roasting is finished to obtain the fired ceramsite. The pore-forming agent is added to increase the internal pores of the ceramsite and achieve the purpose of light weight.
Description
Technical Field
The invention belongs to the technical field of recycling treatment of fly ash, slag and sludge, and particularly relates to building ceramsite prepared from fly ash, sludge and slag and a preparation process thereof.
Background
The tailings are industrial solid wastes with the largest output and stockpiling quantity in China, particularly a large amount of metal sulfides in a metal mine tailing pond are harmful to the environment, and meanwhile, a plurality of useful elements and components in the tailings pond have recycling value; the development and utilization of copper minerals in China have a long history, and because the copper tailings have high heavy metal content and low organic matter content, the copper tailings inevitably cover the original ecological system when stacked, and certain influence is caused on a tailing pond and the surrounding ecological environment. The resources and the environment are hot problems of global attention, and the important tasks of finding the utilization potential of tailing resources, improving the comprehensive utilization level, strengthening the protection of the mine environment and advocating the construction of green mines are the current in the face of the increase of the development of the economic society of China on the rigidity requirement of the mineral resources and the increasing attention on the comprehensive utilization of various mineral resources
In addition, in recent years, China pays high attention to the problem of water pollution treatment, and more sewage plants are built. Sludge, which is a solid or semi-solid waste generated in a water treatment process in a municipal sewage treatment plant, increases as the amount of sewage treatment increases. Because the sludge of the sewage plant contains various organic components and inorganic components, a large amount of organic pollutants are easy to decay and smell, and seriously affect the sanitation condition of the environment, and toxic organic matters, heavy metals, pathogenic bacteria and the like contained in the sludge have toxicity and nondegradability, if the sludge is not safely treated, the pollutants circulate through different forms of biological chains, and potential safety hazards are generated to soil, rivers and even human bodies in the growth period.
With the rapid development of solid waste incineration treatment, the yield of incineration fly ash is increasing. If the stabilization and solidification pretreatment is carried out according to the national hazardous waste treatment requirement and then the safe landfill treatment is carried out, the current hazardous waste safe landfill resources can hardly meet the actual requirement. The existing fly ash harmless and stabilizing technologies at home and abroad mainly comprise three main types of solidification and stabilization, wet chemical treatment and high-temperature treatment, wherein the solidification and stabilization comprise cement solidification, chelating agent stabilization and the like, the wet chemical treatment comprises acid extraction, waste gas neutralization and carbonation and the like, and the two methods are used for treating a final product, and the final product also needs to enter a landfill site and cannot solve the problem of long-term heavy metal dissolution. The high-temperature treatment mainly comprises sintering solidification and melting vitrification, and the high-temperature treatment can generate secondary pollution of waste gas and has higher treatment cost. With the increase of the total capacity of the fly ash from waste incineration and the trend of saturated landfill treatment space, a route for harmless, stable and resource utilization of the fly ash must be found.
Slag and sludge are used as two wastes with large output and serious environmental pollution, no perfect treatment method exists at present for the two wastes, and the main components of the household garbage incineration fly ash are CaO and Al2O3、SiO2And the components are basically consistent with those required by building materials, so that the production of the building ceramsite by using the household garbage incineration fly ash is feasible on the technical level, and most of the production raw materials of the traditional ceramsite are clay, shale and other non-renewable resources. If the fly ash, the slag and the sludge of the sewage treatment plant can be comprehensively recycled, the sludge of the domestic sewage treatment plant and the mine slag are added into the fly ash as auxiliary materials to produce the building ceramsite, the method is undoubtedly a practical technology for treating the fly ash on a large scale, the three wastes are used as materials for manufacturing the ceramsite, the pollution problem of waste materials is solved, and the resource problem of shortage of ceramsite raw materials is relieved to a certain extent. The concept of using waste to prepare waste can effectively treat solid waste and hazardous waste, reduces production cost, and becomes an economical and practical technology in the future.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a building ceramsite prepared from fly ash, sludge and slag and a preparation process thereof, and mainly solves the technical problems that: how to add two wastes of slag and sludge into fly ash for waste utilization, and sludge of domestic sewage treatment plants and mine slag are added into the fly ash as auxiliary materials to realize the purpose of preparing ceramsite.
In order to solve the technical problems, the invention provides a building ceramsite prepared from fly ash, sludge and slag, which comprises the following raw materials in parts by weight:
30-70 parts of fly ash;
30-50 parts of sludge;
30-60 parts of slag;
10-30 parts of pore-forming agent.
Preferably, the raw materials comprise the following components in percentage by mass: 60 parts of fly ash, 50 parts of sludge, 60 parts of slag and 30 parts of pore-forming agent.
Preferably: the pore-forming agent is sodium carbonate.
In addition, according to the raw material composition, the invention provides a process for preparing building ceramsite by fly ash, sludge and slag, which comprises the following steps:
step one, preparing main materials, washing fly ash, respectively drying the washed fly ash, sludge and slag to constant weight, breaking the dried fly ash and slag into fine powder, and grinding the dried sludge into fine powder;
step two, mixing materials, namely uniformly mixing the prepared main material and a pore-forming agent according to the weight part ratio of 30-70 parts of fly ash, 30-50 parts of sludge, 30-60 parts of slag and 10-30 parts of the pore-forming agent to obtain a mixed raw material, and then adding a proper amount of water into the mixed raw material and uniformly stirring to form a plastic briquette;
step three, forming, namely granulating the material mass to manufacture a plurality of spherical blanks with the diameters of 8-15 mm;
drying, namely drying the spherical green body for 2 hours at the temperature of 90-110 ℃ to obtain a dried spherical green body;
and step five, firing the spherical blank into pottery, preheating and insulating the dried spherical blank for 25-35min at the temperature of 400-500 ℃, then firing the spherical blank for 8-12min at the temperature of 1120-1180 ℃, and cooling the spherical blank to room temperature after the firing is finished to obtain the spherical ceramsite.
Preferably: in the first step, the fly ash, the sludge and the slag are fine powder which can pass through a 100-mesh sieve.
Preferably: in the second step, the mass of the water added to the mixed raw material is 20-25% of the mass of the mixed raw material.
Compared with the prior art, the invention has the following advantages:
1. the invention takes three wastes of fly ash, sludge and slag as main raw materials to manufacture the ceramsite, and the three pollutants of fly ash, sludge and slag are solidified, thereby changing waste into valuable under the condition of eliminating environmental pollutants;
2. the fly ash, slag and sludge which are pollution wastes are mixed and fired into the ceramsite, and the doping ratio of the fly ash exceeds 30 percent, so that the prepared ceramsite reaches the basic properties and requirements of the ceramsite, the quality of a fired product is ensured, all properties of the ceramsite reach the requirements of national standard light aggregate, and the aim of treating the fly ash in a large scale is fulfilled;
3. the invention adopts the process of firing the ceramsite by taking the fly ash, the slag and the sludge as main raw materials, has low energy consumption, can realize the harmless and resource utilization of solid waste, effectively and harmlessly treats heavy metal and dioxin, and has important significance on the concept of green development.
Drawings
FIG. 1 is a flow chart of the preparation process of the building ceramsite.
Detailed Description
The construction ceramsite prepared from fly ash, sludge and slag and the preparation process thereof according to the present invention will be further described with reference to FIG. 1 and preferred embodiments.
As shown in figure 1, the building ceramsite prepared from fly ash, sludge and slag and the preparation process thereof are a process for harmless and resource waste utilization of fly ash, industrial slag and sludge of sewage treatment plants generated by garbage incineration, firstly, the fly ash is washed and then dried, the dried fly ash, the dried and ground fine slag and sludge and pore-forming agent are uniformly mixed according to the parts by weight of 30-70 parts of fly ash, 30-50 parts of sludge, 30-60 parts of slag and 10-30 parts of pore-forming agent, then, a proper amount of water is added for stirring uniformly to form a plastic briquette, the briquette is processed into a plurality of spherical blanks with the grain diameter of 8-15mm, then, the spherical blanks are put into a drying oven for drying for 2h under the condition of 105 ℃, finally, the dried spherical blanks are transferred into a muffle furnace, and are preheated for 30 minutes under the condition of temperature of 450 ℃, then roasting for 10 minutes at the temperature of 1150 ℃, and cooling to room temperature after roasting is finished to obtain the fired ceramsite. The pore-forming agent is added to increase the internal pores of the ceramsite and achieve the purpose of light weight.
Example 1, which comprises the steps of:
step one, raw material treatment, namely washing fly ash, then respectively putting the washed fly ash, sludge and slag into an oven to be dried to constant weight, breaking the dried fly ash and slag into fine powder which can pass through a 100-mesh sieve, and simultaneously grinding the dried sludge into fine powder which can pass through the 100-mesh sieve by using a ball mill;
secondly, performing blank molding, namely uniformly mixing 30 parts of fly ash, 30 parts of sludge, 30 parts of slag and 10 parts of pore-forming agent (sodium carbonate) according to the weight part ratio to obtain a mixed raw material, then adding a proper amount of water into the mixed raw material and uniformly stirring to form a moldable briquette, and then granulating the briquette to prepare a plurality of spherical blanks with the diameters of 8-15 mm;
step three, drying, namely putting the spherical green body into an oven, and drying for 2 hours at the temperature of 100 ℃ to obtain a dried spherical green body;
step four, firing the mixture into the pottery,
1) preheating: firstly, putting the dried spherical blank into a muffle furnace at the temperature of 450 ℃, and preheating and preserving heat for 30 min;
2) roasting: then, the temperature of the muffle furnace is adjusted to 1150 ℃, and roasting is carried out for 10 min;
3) and (3) cooling: after the baking and sintering, the spherical ceramsite can be obtained after the spherical ceramsite is cooled to room temperature.
The bulk density of the ceramsite obtained in the embodiment 1 is 630kg/m3, the cylinder pressure strength is 8MPa, the water absorption rate for 1 hour is 6%, and the dioxin content, the heavy metal leaching content, the soluble chlorine content, the sulfide and sulfate content and the radioactivity in the ceramsite prepared by the method are far lower than the national standard limit value.
Example 2, which comprises the steps of:
step one, raw material treatment, namely washing fly ash, then respectively putting the washed fly ash, sludge and slag into an oven to be dried to constant weight, breaking the dried fly ash and slag into fine powder which can pass through a 100-mesh sieve, and simultaneously grinding the dried sludge into fine powder which can pass through the 100-mesh sieve by using a ball mill;
step two, performing blank molding, namely uniformly mixing 60 parts of fly ash, 50 parts of sludge, 60 parts of slag and 30 parts of pore-forming agent (sodium carbonate) according to the weight part ratio to obtain a mixed raw material, then adding a proper amount of water into the mixed raw material and uniformly stirring to form a moldable briquette, and then granulating the briquette to prepare a plurality of spherical blanks with the diameters of 8-15 mm;
step three, drying, namely putting the spherical green body into an oven, and drying for 2 hours at the temperature of 100 ℃ to obtain a dried spherical green body;
step four, firing the mixture into the pottery,
1) preheating: firstly, putting the dried spherical blank into a muffle furnace at the temperature of 450 ℃, and preheating and preserving heat for 30 min;
2) roasting: then, the temperature of the muffle furnace is adjusted to 1150 ℃, and roasting is carried out for 10 min;
3) and (3) cooling: after the baking and sintering, the spherical ceramsite can be obtained after the spherical ceramsite is cooled to room temperature.
The bulk density of the ceramsite obtained in the embodiment 2 is 570kg/m3, the cylinder pressure strength is 7MPa, the water absorption rate in 1 hour is 8%, and the dioxin content, the heavy metal leaching content, the soluble chlorine content, the sulfide and sulfate content and the radioactivity in the ceramsite prepared by the method are far lower than the national standard limit value.
Example 3, which comprises the steps of:
step one, raw material treatment, namely washing fly ash, then respectively putting the washed fly ash, sludge and slag into an oven to be dried to constant weight, breaking the dried fly ash and slag into fine powder which can pass through a 100-mesh sieve, and simultaneously grinding the dried sludge into fine powder which can pass through the 100-mesh sieve by using a ball mill;
step two, performing blank molding, namely uniformly mixing 60 parts of fly ash, 50 parts of sludge, 60 parts of slag and 30 parts of pore-forming agent (sodium carbonate) according to the weight part ratio to obtain a mixed raw material, then adding a proper amount of water into the mixed raw material and uniformly stirring to form a moldable briquette, and then granulating the briquette to prepare a plurality of spherical blanks with the diameters of 8-15 mm;
step three, drying, namely putting the spherical green body into an oven, and drying for 2 hours at the temperature of 100 ℃ to obtain a dried spherical green body;
step four, firing the mixture into the pottery,
1) preheating: firstly, putting the dried spherical blank into a muffle furnace at the temperature of 450 ℃, and preheating and preserving heat for 30 min;
2) roasting: then, the temperature of the muffle furnace is adjusted to 1150 ℃, and roasting is carried out for 10 min;
3) and (3) cooling: after the baking and sintering, the spherical ceramsite can be obtained after the spherical ceramsite is cooled to room temperature.
The bulk density of the ceramsite obtained in the example 3 is 600kg/m3, the cylinder pressure strength is 6.5MPa, the water absorption rate in 1 hour is 9%, and the dioxin content, the heavy metal leaching content, the soluble chlorine content, the sulfide and sulfate content and the radioactivity in the ceramsite prepared by the method are far lower than the limit value of the national standard.
In the above embodiment of the present invention, the building ceramsite prepared from fly ash, slag and sludge from sewage treatment plants and the preparation process of the building ceramsite are provided; the building ceramsite prepared by mixing the waste incineration fly ash, the polluted waste slag, the sludge and the pore-forming agent generates a liquid phase in the sintering process, the surface of the building ceramsite forms vitrification, and simultaneously expands, so that the basic properties and requirements of the ceramsite are realized, the quality of a fired product is ensured, the ceramsite prepared by the method is safe, high in strength and durable, each property of the ceramsite meets the requirements of national standard light aggregate, the current situation of shortage of ceramsite raw materials can be greatly relieved, the harmless recycling and utilization of solid wastes are realized, and the building ceramsite has important significance on the concept of green development.
Table 1 shows statistical test data for each example.
| Ceramic particle | Barrel pressure strength | Density of | Water absorption/h | Standard of pest control |
| Example 1 | 8MPa | 630kg/m3 | 6% | Far below |
| Example 2 | 7MPa | 570kg/m3 | 8% | Far below |
| Example 3 | 6.5MPa | 600kg/m3 | 9% | Far below |
As can be seen from Table 1, the properties of the ceramsite prepared by the fly ash, the sludge and the slag provided by the invention meet the national standard requirements.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent process changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. The building ceramsite prepared from fly ash, sludge and slag is characterized in that raw materials comprise the fly ash, the slag, the sludge and a pore-forming agent, and the raw materials comprise the following components in parts by weight:
30-70 parts of fly ash;
30-50 parts of sludge;
30-60 parts of slag;
10-30 parts of pore-forming agent.
2. The architectural ceramsite prepared from fly ash, sludge and slag according to claim 1, wherein: the raw material comprises the following components in percentage by mass: 60 parts of fly ash, 50 parts of sludge, 60 parts of slag and 30 parts of pore-forming agent.
3. The architectural ceramsite prepared from fly ash, sludge and slag according to claim 2, wherein: the pore-forming agent is sodium carbonate.
4. A process for preparing building ceramsite from fly ash, sludge and slag is characterized by comprising the following steps:
step one, preparing main materials, washing fly ash, respectively drying the washed fly ash, sludge and slag to constant weight, breaking the dried fly ash and slag into fine powder, and grinding the dried sludge into fine powder;
step two, mixing materials, namely uniformly mixing the prepared main material and a pore-forming agent according to the weight part ratio of 30-70 parts of fly ash, 30-50 parts of sludge, 30-60 parts of slag and 10-30 parts of the pore-forming agent to obtain a mixed raw material, and then adding a proper amount of water into the mixed raw material and uniformly stirring to form a plastic briquette;
step three, forming, namely granulating the material mass to manufacture a plurality of spherical blanks with the diameters of 8-15 mm;
drying, namely drying the spherical green body for 2 hours at the temperature of 90-110 ℃ to obtain a dried spherical green body;
and step five, firing the spherical blank into pottery, preheating and insulating the dried spherical blank for 25-35min at the temperature of 400-500 ℃, then firing the spherical blank for 8-12min at the temperature of 1120-1180 ℃, and cooling the spherical blank to room temperature after the firing is finished to obtain the spherical ceramsite.
5. The process for preparing building ceramsite according to claim 4, wherein the fly ash, the sludge and the slag comprise the following steps: in the first step, the fly ash, the sludge and the slag are fine powder which can pass through a 100-mesh sieve.
6. The process for preparing building ceramsite according to claim 4 or 5, wherein the fly ash, the sludge and the slag are as follows: in the second step, the mass of the water added to the mixed raw material is 20-25% of the mass of the mixed raw material.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114409432A (en) * | 2022-01-25 | 2022-04-29 | 河北工业大学 | Method for preparing water treatment ceramsite by using waste incinerator slag and molybdenum tailings |
| CN114890701A (en) * | 2022-05-09 | 2022-08-12 | 成都理工大学 | Environment-friendly economical ceramsite for plateau building concrete and preparation method and application thereof |
| CN117123591A (en) * | 2023-10-26 | 2023-11-28 | 常熟理工学院 | Method for dry dechlorination of waste incineration fly ash and synchronous preparation of liquid chlorine and solidified soil |
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| CN114890701A (en) * | 2022-05-09 | 2022-08-12 | 成都理工大学 | Environment-friendly economical ceramsite for plateau building concrete and preparation method and application thereof |
| CN117123591A (en) * | 2023-10-26 | 2023-11-28 | 常熟理工学院 | Method for dry dechlorination of waste incineration fly ash and synchronous preparation of liquid chlorine and solidified soil |
| CN117123591B (en) * | 2023-10-26 | 2024-02-02 | 常熟理工学院 | Method for dry dechlorination of waste incineration fly ash and synchronous preparation of liquid chlorine and solidified soil |
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