CN113563036A - Fly ash autoclaved brick containing fly ash of garbage power plant and preparation method thereof - Google Patents
Fly ash autoclaved brick containing fly ash of garbage power plant and preparation method thereof Download PDFInfo
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- CN113563036A CN113563036A CN202110996917.1A CN202110996917A CN113563036A CN 113563036 A CN113563036 A CN 113563036A CN 202110996917 A CN202110996917 A CN 202110996917A CN 113563036 A CN113563036 A CN 113563036A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 89
- 239000011449 brick Substances 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000002156 mixing Methods 0.000 claims abstract description 47
- 239000002738 chelating agent Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 17
- 150000001875 compounds Chemical class 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 16
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims abstract description 14
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 20
- 239000003513 alkali Substances 0.000 claims description 15
- 229910001385 heavy metal Inorganic materials 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 8
- 239000006004 Quartz sand Substances 0.000 claims description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 8
- 150000001735 carboxylic acids Chemical class 0.000 claims description 8
- 239000004571 lime Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 229940120146 EDTMP Drugs 0.000 claims description 6
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 claims description 4
- 229920000805 Polyaspartic acid Polymers 0.000 claims description 4
- 229920002125 Sokalan® Polymers 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 4
- 239000004584 polyacrylic acid Substances 0.000 claims description 4
- 108010064470 polyaspartate Proteins 0.000 claims description 4
- 229920001529 polyepoxysuccinic acid Polymers 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000012047 saturated solution Substances 0.000 claims description 4
- LMBWSYZSUOEYSN-UHFFFAOYSA-N diethyldithiocarbamic acid Chemical group CCN(CC)C(S)=S LMBWSYZSUOEYSN-UHFFFAOYSA-N 0.000 claims description 2
- 150000002023 dithiocarboxylic acids Chemical class 0.000 claims description 2
- 229950004394 ditiocarb Drugs 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 description 13
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 239000003814 drug Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- -1 dithio carboxylate Chemical class 0.000 description 2
- 229910052816 inorganic phosphate Inorganic materials 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 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 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- DQIPXGFHRRCVHY-UHFFFAOYSA-N chromium zinc Chemical compound [Cr].[Zn] DQIPXGFHRRCVHY-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/10—Burned or pyrolised refuse
- C04B18/105—Gaseous combustion products or dusts collected from waste incineration, e.g. sludge resulting from the purification of gaseous combustion products of waste incineration
- C04B18/106—Fly ash from waste incinerators
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of fly ash treatment, and discloses a fly ash autoclaved brick containing fly ash of a garbage power plant and a preparation method thereof, wherein the autoclaved brick is prepared from the following raw materials in parts by mass: 45-50 parts of aggregate; 10-15 parts of a cementing agent; 5-10 parts of cement; 20-30 parts of silica sand; 10-20 parts of coal gangue; 0.3-0.5 part of a water reducing agent; the preparation method comprises the following steps: s1, mixing fly ash, water and a compound chelating agent in a mass mixing ratio of 3-10: 5-50: 2 to form mortar; s2, carrying out solid-liquid separation on the mortar to obtain filter residues, and taking the filter residues as aggregate; s3, adding the aggregate, the cementing agent, the cement, the silica sand, the coal gangue and the water reducing agent into a mixing stirrer in proportion, and adding water for mixing to obtain a stabilized product; s4, conveying the stabilized product into a full-automatic hydraulic brick machine to be pressed into a green brick; s5, feeding the green brick into a still kettle with steam temperature above 175 ℃ and steam pressure above 0.8MPa for high-pressure steam curing to obtain the finished steam-pressed brick.
Description
Technical Field
The invention belongs to the technical field of fly ash treatment, and particularly relates to a fly ash autoclaved brick containing fly ash of a garbage power plant and a preparation method thereof.
Background
The fly ash generated in the process of burning the garbage contains substances such as heavy metal, dioxin, soluble salts and the like with high concentration, so that the resource utilization of the fly ash is restricted. At present, the fly ash treatment in China mainly adopts a technology of curing first and then burying, and the curing mode mainly comprises cement curing and medicament stabilizing treatment.
Wherein: the cement curing strength and the water immersion durability are poor; the medicament stabilizing treatment mostly adopts chelating agent made of inorganic phosphate, and the inorganic phosphate can pollute the environment, especially water area, and can only react with partial heavy metal ions in the curing process, so that the curing range is greatly limited. Therefore, the existing solidification landfill treatment still has the problems of resource waste, potential secondary pollution and the like.
In conclusion, the fly ash autoclaved brick containing the fly ash of the garbage power plant is provided for realizing the recycling of the fly ash.
Disclosure of Invention
In view of the above, the present invention provides a fly ash autoclaved brick containing fly ash of a refuse power plant and a preparation method thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
1) a fly ash autoclaved brick containing fly ash of a refuse power plant comprises the following raw materials in parts by mass:
45-50 parts of aggregate;
10-15 parts of a cementing agent;
5-10 parts of cement;
20-30 parts of silica sand;
10-20 parts of coal gangue;
0.3-0.5 part of a water reducing agent;
wherein
The aggregate is fly ash after heavy metal capture, and the fly ash is generated by incineration of a refuse power plant;
the cementing agent is formed by mixing lime, quartz sand and fly ash according to a proportion;
the cement is one or a mixture of Portland cement and sulphoaluminate cement;
SiO in the silica sand2The content is more than or equal to 75 percent.
Preferably, the mass mixing ratio of the lime, the quartz sand and the fly ash is 20: 10: 70.
2) the preparation method of the fly ash autoclaved brick containing the fly ash of the refuse power plant comprises the following steps:
s1, mixing fly ash, water and a compound chelating agent in a mass mixing ratio of 3-10: 5-50: 2, stirring and mixing to form mortar;
s2, carrying out solid-liquid separation on the mortar to obtain filter residues, and taking the filter residues as aggregate;
s3, adding the aggregate, the cementing agent, the cement, the silica sand, the coal gangue and the water reducing agent into a mixing stirrer in proportion, and adding water for mixing to obtain a stabilized product;
s4, conveying the stabilized product into a full-automatic hydraulic brick machine to be pressed into a green brick;
and S5, feeding the green brick into an autoclave with steam temperature of more than 175 ℃ and steam pressure of more than 0.8MPa for high-pressure steam curing, and standing at normal temperature for 1-2 weeks after curing to obtain a finished autoclaved brick.
Preferably, the compound chelating agent is formed by mixing an organic chelating agent and an alkali solution, and the mass mixing ratio of the organic chelating agent to the alkali solution is 35-14: 65 to 86.
Preferably, the organic chelating agent is prepared from the following raw materials in parts by mass:
5-10 parts of organic phosphonic acid;
3-11 parts of a carboxylic acid polymer;
6-14 parts of dithio-carboxylate.
Preferably, the organic phosphonic acid is ethylenediamine tetramethylene phosphonic acid; the carboxylic acid polymer is one or a mixture of hydroxycarboxylic acid and water-soluble carboxylic acid, the hydroxycarboxylic acid is polyacrylic acid, and the water-soluble carboxylic acid is one or a mixture of polyepoxysuccinic acid and polyaspartic acid; the dithiocarboxylic acid salt is sodium diethyldithiocarbamate.
Preferably, the alkali solution is a calcium hydroxide saturated solution or a sodium hydroxide solution with the concentration of 2-6 mol/L.
Preferably, in step S3, the method further includes: and grinding the aggregate and the cementing agent into fine powder by using a ball mill, wherein the grain size of more than 95 percent of the fine powder is less than or equal to 0.08 mm.
Preferably, in the step S3, the kneading time is 3 to 5 min.
Preferably, in the step S5, the steam temperature is 190-250 ℃, the steam pressure is 1.5-3 MPa, and the curing time of the high-pressure steam curing is 10-12 h.
Compared with the prior art, the invention has the following beneficial effects:
in the invention, the organic chelating agent and the alkali solution are compounded to form the compound chelating agent, and the compound chelating agent is utilized to capture heavy metals in the fly ash, so that on one hand, the pollution to the environment caused by medicament treatment is avoided, and on the other hand, the compound chelating agent can quickly react with various heavy metal ions (mercury, lead, copper, chromium, nickel, manganese, zinc chromium and the like) to chelate and synthesize precipitates at normal temperature, thereby achieving the purpose of capturing and removing the heavy metals in a large range.
In addition, in the invention, the fly ash after heavy metal capture is used as a raw material to manufacture the fly ash autoclaved brick, so that the fly ash is effectively recycled, and the manufactured brick body has the advantages of high strength and low cost. And moreover, the problem of heavy metal ion precipitation in the use process of the brick body is effectively avoided based on the stable solidification of the compound chelating agent.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A fly ash autoclaved brick containing fly ash of a refuse power plant comprises the following raw materials in parts by mass:
45 parts of aggregate (fly ash after heavy metal capture, wherein the fly ash is generated by incineration in a refuse power plant);
10 parts of cementing agent (comprising 2 parts of lime, 1 part of quartz sand and 7 parts of fly ash);
5 parts of Portland cement;
SiO229.5 parts of silica sand with the content of 88 percent;
10 parts of coal gangue;
0.5 part of water reducing agent.
A preparation method of a fly ash autoclaved brick containing fly ash of a garbage power plant comprises the following steps:
s1, mixing fly ash, water and a compound chelating agent by a mass mixing ratio of 3: 5: 2, stirring and mixing to form mortar; wherein:
the compound chelating agent is formed by mixing 14 parts of organic chelating agent and 86 parts of alkali solution, wherein the 14 parts of organic chelating agent comprises 5 parts of ethylenediamine tetramethylene phosphonic acid, 3 parts of polyacrylic acid and 6 parts of dithio carboxylate;
the alkali solution is calcium hydroxide saturated solution;
s2, carrying out solid-liquid separation on the mortar to obtain filter residues, and taking the filter residues as aggregate;
s3, grinding the aggregate and the cementing agent into fine powder by using a ball mill, adding the aggregate, the cementing agent, cement, silica sand, coal gangue and a water reducing agent into a mixing stirrer according to the proportion, and adding water for mixing to obtain a stabilized product, wherein more than 95% of the fine powder has a particle size of less than or equal to 0.08 mm;
s4, conveying the stabilized product into a full-automatic hydraulic brick machine to be pressed into a green brick;
and S5, feeding the green brick into a still kettle with steam temperature of 190 ℃ and steam pressure of 1.5MPa for high-pressure steam curing for 12h, and standing at normal temperature for 1-2 weeks after curing to obtain a finished product of the autoclaved brick.
In this example, the strength of the finished autoclaved brick can reach 35 MPa.
Example 2
A fly ash autoclaved brick containing fly ash of a refuse power plant comprises the following raw materials in parts by mass:
40 parts of aggregate (fly ash after heavy metal capture, wherein the fly ash is generated by incineration in a refuse power plant);
12 parts of cementing agent (comprising 2.4 parts of lime, 1.2 parts of quartz sand and 8.4 parts of fly ash);
8.6 parts of sulphoaluminate cement;
SiO226 parts of silica sand with the content of 80 percent;
14 parts of coal gangue;
0.4 part of water reducing agent.
A preparation method of a fly ash autoclaved brick containing fly ash of a garbage power plant comprises the following steps:
s1, mixing fly ash, water and a compound chelating agent by a mass mixing ratio of 5: 25: 2, stirring and mixing to form mortar; wherein:
the compound chelating agent is formed by mixing 25 parts of organic chelating agent and 75 parts of alkali solution, wherein the 25 parts of organic chelating agent comprises 8 parts of ethylenediamine tetramethylene phosphonic acid, 7 parts of polyepoxysuccinic acid and 10 parts of dithio carboxylate;
the alkali solution is a sodium hydroxide solution with the concentration of 2 mol/L;
s2, carrying out solid-liquid separation on the mortar to obtain filter residues, and taking the filter residues as aggregate;
s3, grinding the aggregate and the cementing agent into fine powder by using a ball mill, adding the aggregate, the cementing agent, cement, silica sand, coal gangue and a water reducing agent into a mixing stirrer according to the proportion, and adding water for mixing to obtain a stabilized product, wherein more than 95% of the fine powder has a particle size of less than or equal to 0.08 mm;
s4, conveying the stabilized product into a full-automatic hydraulic brick machine to be pressed into a green brick;
and S5, feeding the green bricks into a still kettle with steam temperature of 220 ℃ and steam pressure of 2MPa for high-pressure steam curing for 11h, and standing at normal temperature for 1-2 weeks after curing to obtain finished autoclaved bricks.
In this example, the strength of the finished autoclaved brick can reach 30 MPa.
Example 3
A fly ash autoclaved brick containing fly ash of a refuse power plant comprises the following raw materials in parts by mass:
37.6 parts of aggregate (fly ash after heavy metal capture, wherein the fly ash is generated by incineration in a refuse power plant);
14 parts of cementing agent (comprising 2.8 parts of lime, 1.4 parts of quartz sand and 9.8 parts of fly ash);
8 parts of Portland cement;
SiO222 parts of 83 percent silica sand;
18 parts of coal gangue;
0.4 part of water reducing agent.
A preparation method of a fly ash autoclaved brick containing fly ash of a garbage power plant comprises the following steps:
s1, mixing fly ash, water and a compound chelating agent by a mass mixing ratio of 7: 30: 2, stirring and mixing to form mortar; wherein:
the compound chelating agent is formed by mixing 31 parts of organic chelating agent and 69 parts of alkali solution, wherein the 31 parts of organic chelating agent comprises 9 parts of ethylenediamine tetramethylene phosphonic acid, 9 parts of polyaspartic acid and 13 parts of dithio-carboxylate;
the alkali solution is calcium hydroxide saturated solution;
s2, carrying out solid-liquid separation on the mortar to obtain filter residues, and taking the filter residues as aggregate;
s3, grinding the aggregate and the cementing agent into fine powder by using a ball mill, adding the aggregate, the cementing agent, cement, silica sand, coal gangue and a water reducing agent into a mixing stirrer according to the proportion, and adding water for mixing to obtain a stabilized product, wherein more than 95% of the fine powder has a particle size of less than or equal to 0.08 mm;
s4, conveying the stabilized product into a full-automatic hydraulic brick machine to be pressed into a green brick;
and S5, feeding the green brick into a still kettle with the steam temperature of 230 ℃ and the steam pressure of 2.4MPa for high-pressure steam curing for 11 hours, and standing at normal temperature for 1-2 weeks after curing to obtain a finished product autoclaved brick.
In this example, the strength of the finished autoclaved brick can reach 31 MPa.
Example 4
A fly ash autoclaved brick containing fly ash of a refuse power plant comprises the following raw materials in parts by mass:
35 parts of aggregate (fly ash after heavy metal capture, wherein the fly ash is generated by incineration in a refuse power plant);
15 parts of cementing agent (comprising 3 parts of lime, 1.5 parts of quartz sand and 10.5 parts of fly ash);
10 parts of Portland cement;
SiO220 parts of silica sand with the content of 75 percent;
19.7 parts of coal gangue;
0.3 part of water reducing agent.
A preparation method of a fly ash autoclaved brick containing fly ash of a garbage power plant comprises the following steps:
s1, mixing fly ash, water and a compound chelating agent by a mass mixing ratio of 10: 50: 2, stirring and mixing to form mortar; wherein:
the compound chelating agent is formed by mixing 35 parts of organic chelating agent and 65 parts of alkali solution, wherein the 35 parts of organic chelating agent comprises 10 parts of ethylenediamine tetramethylene phosphonic acid, 11 parts of polyacrylic acid, a mixture formed by combining polyepoxysuccinic acid and polyaspartic acid, and 14 parts of dithio-carboxylate;
the alkali solution is a sodium hydroxide solution with the concentration of 6 mol/L;
s2, carrying out solid-liquid separation on the mortar to obtain filter residues, and taking the filter residues as aggregate;
s3, grinding the aggregate and the cementing agent into fine powder by using a ball mill, adding the aggregate, the cementing agent, cement, silica sand, coal gangue and a water reducing agent into a mixing stirrer according to the proportion, and adding water for mixing to obtain a stabilized product, wherein more than 95% of the fine powder has a particle size of less than or equal to 0.08 mm;
s4, conveying the stabilized product into a full-automatic hydraulic brick machine to be pressed into a green brick;
and S5, feeding the green brick into a still kettle with steam temperature of 250 ℃ and steam pressure of 3MPa for high-pressure steam curing for 10h, and standing at normal temperature for 1-2 weeks after curing to obtain a finished product of the autoclaved brick.
In this example, the strength of the finished autoclaved brick can reach 32 MPa.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The fly ash autoclaved brick containing fly ash of a refuse power plant is characterized by comprising the following raw materials in parts by mass:
45-50 parts of aggregate;
10-15 parts of a cementing agent;
5-10 parts of cement;
20-30 parts of silica sand;
10-20 parts of coal gangue;
0.3-0.5 part of a water reducing agent;
wherein
The aggregate is fly ash after heavy metal capture, and the fly ash is generated by incineration of a refuse power plant;
the cementing agent is formed by mixing lime, quartz sand and fly ash according to a proportion;
the cement is one or a mixture of Portland cement and sulphoaluminate cement;
SiO in the silica sand2The content is more than or equal to 75 percent.
2. The fly ash autoclaved brick containing fly ash of a refuse power plant according to claim 1, wherein: the mass mixing ratio of the lime, the quartz sand and the fly ash is 20: 10: 70.
3. a method of making the fly ash autoclaved brick containing fly ash from a refuse power plant of claim 1 or 2, comprising:
s1, mixing fly ash, water and a compound chelating agent in a mass mixing ratio of 3-10: 5-50: 2, stirring and mixing to form mortar;
s2, carrying out solid-liquid separation on the mortar to obtain filter residues, and taking the filter residues as aggregate;
s3, adding the aggregate, the cementing agent, the cement, the silica sand, the coal gangue and the water reducing agent into a mixing stirrer in proportion, and adding water for mixing to obtain a stabilized product;
s4, conveying the stabilized product into a full-automatic hydraulic brick machine to be pressed into a green brick;
and S5, feeding the green brick into an autoclave with steam temperature of more than 175 ℃ and steam pressure of more than 0.8MPa for high-pressure steam curing, and standing at normal temperature for 1-2 weeks after curing to obtain a finished autoclaved brick.
4. The method for preparing the fly ash autoclaved brick containing fly ash of a refuse power plant according to claim 3, wherein: the compound chelating agent is formed by mixing an organic chelating agent and an alkali solution, and the mass mixing ratio of the organic chelating agent to the alkali solution is 35-14: 65 to 86.
5. The method for preparing the fly ash autoclaved brick containing fly ash of the refuse electric power plant according to claim 4, wherein the organic chelating agent is composed of the following raw materials in parts by mass:
5-10 parts of organic phosphonic acid;
3-11 parts of a carboxylic acid polymer;
6-14 parts of dithio-carboxylate.
6. The method of claim 5, wherein the fly ash autoclaved brick containing fly ash from a refuse power plant comprises:
the organic phosphonic acid is ethylenediamine tetramethylene phosphonic acid;
the carboxylic acid polymer is one or a mixture of hydroxycarboxylic acid and water-soluble carboxylic acid, the hydroxycarboxylic acid is polyacrylic acid, and the water-soluble carboxylic acid is one or a mixture of polyepoxysuccinic acid and polyaspartic acid;
the dithiocarboxylic acid salt is sodium diethyldithiocarbamate.
7. The method for preparing the fly ash autoclaved brick containing fly ash of the refuse power plant according to claim 4, wherein the alkali solution is a calcium hydroxide saturated solution or a sodium hydroxide solution with a concentration of 2-6 mol/L.
8. The method for preparing the fly ash autoclaved brick containing fly ash of the refuse electric power plant according to claim 3, wherein in the step S3, the method further comprises:
and grinding the aggregate and the cementing agent into fine powder by using a ball mill, wherein the grain size of more than 95 percent of the fine powder is less than or equal to 0.08 mm.
9. The method of claim 8, wherein the fly ash autoclaved brick containing fly ash from a refuse power plant comprises: in the step S3, the mixing time is 3-5 min.
10. The method for preparing the fly ash autoclaved brick containing fly ash of a refuse power plant according to claim 3, wherein: in the step S5, the steam temperature is 190-250 ℃, the steam pressure is 1.5-3 MPa, and the curing time of high-pressure steam curing is 10-12 h.
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| CN114011839A (en) * | 2021-11-16 | 2022-02-08 | 上海理工大学 | Method for innocent treatment of fly ash by ultrahigh pressure pressing process |
| WO2024210940A3 (en) * | 2022-04-07 | 2025-02-27 | William Marsh Rice University | Heavy-metal-reduced post-industrial waste in cementitious materials and methods of making and system |
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