CN117534440A - Solid waste-based sintered brick and preparation method thereof - Google Patents
Solid waste-based sintered brick and preparation method thereof Download PDFInfo
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- CN117534440A CN117534440A CN202311573820.5A CN202311573820A CN117534440A CN 117534440 A CN117534440 A CN 117534440A CN 202311573820 A CN202311573820 A CN 202311573820A CN 117534440 A CN117534440 A CN 117534440A
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- 239000011449 brick Substances 0.000 title claims abstract description 69
- 239000002910 solid waste Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000005245 sintering Methods 0.000 claims abstract description 30
- 239000002585 base Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000011707 mineral Substances 0.000 claims abstract description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 230000005284 excitation Effects 0.000 claims abstract description 13
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000011863 silicon-based powder Substances 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000003623 enhancer Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims 1
- 229910052623 talc Inorganic materials 0.000 claims 1
- 239000012752 auxiliary agent Substances 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000006253 efflorescence Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 206010037844 rash Diseases 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910017090 AlO 2 Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910018626 Al(OH) Inorganic materials 0.000 description 1
- 229910000503 Na-aluminosilicate Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910002800 Si–O–Al Inorganic materials 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000000404 calcium aluminium silicate Substances 0.000 description 1
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 1
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 1
- 229940078583 calcium aluminosilicate Drugs 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000429 sodium aluminium silicate Substances 0.000 description 1
- 235000012217 sodium aluminium silicate Nutrition 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/138—Waste materials; Refuse; Residues from metallurgical processes, e.g. slag, furnace dust, galvanic waste
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- C—CHEMISTRY; METALLURGY
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- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
- C04B33/1322—Red mud
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/32—Burning methods
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- 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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- 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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
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- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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Abstract
The invention relates to the technical field of solid waste recovery, in particular to a solid waste-based sintered brick and a preparation method thereof. The raw materials of the solid waste base sintered brick comprise 100 parts of solid waste, 0.5-1 part of sintering aid, 5-10 parts of nano silica fume, 10-20 parts of liquid water glass and 10-20 parts of water; the solid waste comprises 0-50 parts of red mud and 50-100 parts of mineral powder; the preparation method comprises the steps of uniformly mixing solid waste and sintering auxiliary agent to obtain premixed dry material; mixing nano silica fume, liquid water glass and water to obtain an alkali excitation reinforcing agent; adding an alkali excitation reinforcing agent into the premixed dry material, and stirring and mixing to obtain a cementing material; vibrating and molding the cementing material to obtain a green brick; drying the green bricks to obtain dried green bricks; roasting the dried green body to obtain the solid waste base sintered brick. The solid waste-based sintered brick prepared by the method has high strength and strong durability, does not generate obvious whiskering phenomenon, and can realize the recycling utilization of solid waste.
Description
Technical Field
The invention relates to the technical field of solid waste recovery, in particular to a solid waste-based sintered brick and a preparation method thereof.
Background
In industrial production, a large amount of industrial solid waste is often generated, such as red mud discharged during alumina extraction in aluminum production industry, mineral exploitation, slag produced in blast furnace ironmaking, mineral powder and the like. If the solid wastes are directly buried, burned or otherwise discharged into the natural environment, not only can the waste of resources be caused, but also the hidden danger of damaging the natural environment is caused. How to consume such solid waste in large amounts is an important research topic.
In the prior art, one of the main methods for consuming the solid waste is to use the solid waste in the building engineering to replace or partially replace the traditional building materials, so that the original building materials can be saved while the damage of the solid waste discharge to the environment is reduced, the exploitation of natural resources is further reduced, and the environmental burden is further lightened. The brick building material is an ideal application direction of the prior solid waste resource utilization, wherein the solid waste-based sintered brick is a brick material produced by taking industrial wastes such as fly ash, red mud, mineral powder and the like as main materials and matching with auxiliary materials such as cement, retarder, sintering aid and the like.
However, in the existing baked brick production process, in order to improve the strength, the consumption of alkali-exciting agent in raw materials is generally large, and main materials such as red mud and the like are alkaline materials, and the content of alkaline substances in the manufactured baked brick can be improved after a large amount of alkali-exciting agent is added, so that the existing solid waste-based baked brick is extremely easy to generate a whiskering phenomenon in the use process, the internal structure and the appearance of a brick body are influenced, even the structure of the baked brick is loose, the surface of the baked brick is peeled off under severe conditions, and the service life is short.
Disclosure of Invention
Aiming at the technical problem that the use of solid waste to produce baked bricks is easy to cause the efflorescence in the use process due to the large consumption of alkali-exciting agent in the prior art, the invention provides the solid waste-based baked bricks and the preparation method thereof.
In a first aspect, the invention provides a solid waste-based sintered brick, which comprises the following raw materials in parts by weight:
100 parts of solid waste, 0.5-1 part of sintering aid, 5-10 parts of nano micro silicon powder, 10-20 parts of liquid sodium silicate and 10-20 parts of water; the solid waste comprises 0-50 parts of red mud and 50-100 parts of mineral powder.
The nano silica fume is used as a pre-dispersion carrier, a crystal nucleus structure can be formed in the solid waste base sintered brick, the durability of the solid waste base sintered brick is remarkably improved, the strength of the solid waste base sintered brick can be adjusted by adjusting the addition amount of the nano silica fume, the nano silica fume is suitable for different construction requirements, and the maintenance cost is effectively reduced.
Furthermore, the sintering aid is nano aluminum oxide or the combination of nano aluminum oxide and talcum powder and/or mica powder, and the nano aluminum oxide is used as one of the components of the sintering aid, so that the sintering system can be obviously promoted, the sintering process is accelerated, and the sintering temperature can be reduced on the premise of ensuring the strength of the sintered brick.
Further, the mineral powder is S105-grade mineral powder, and the main components comprise silicon dioxide, aluminum oxide, ferric oxide, calcium oxide and magnesium oxide.
Further, the grain diameter of the nanometer silica fume is 20-200nm.
Further, the modulus of the liquid water glass is 1.0-2.5.
In a second aspect, the invention provides a method for preparing the solid waste base sintered brick, which comprises the following steps:
(1) Uniformly mixing the solid waste with a sintering aid to obtain a premixed dry material;
(2) Mixing and stirring nano silica fume and liquid water glass with water to obtain an alkali excitation reinforcing agent;
(3) Adding an alkali excitation reinforcing agent into the premixed dry material, and stirring and mixing to obtain a cementing material;
(4) Placing the cementing material into a mould, and performing vibration molding to obtain a green brick;
(5) And drying the green bricks to obtain dried green bricks.
(6) And uniformly placing the dried green bodies at intervals in a high-temperature furnace for roasting, and cooling or directly taking out along with the furnace after roasting is finished to obtain the solid waste base sintered bricks.
The reaction principle in the preparation process of the solid waste base baked brick is as follows:
after the alkali excitation reinforcing agent is mixed with the premixed dry material, the water glass dissolves out Si and Al ions on the surfaces of the red mud and/or mineral powder, and the Si and Al ions are polymerized, dehydrated and hardened in the subsequent vibration molding, drying and roasting processes to form a short-range ordered long-range unnecessary three-dimensional structure of Si-O-Al, thereby forming a composite material containing [ SiO ] 4 ](silicon oxygen tetrahedra) and [ AlO 4 ]The (aluminum oxide tetrahedral) structure, three-dimensional network gel material with quasi-crystalline character, provides high strength and high durability for solid waste based sintered bricks.
The reaction equations involved include:
SiO 2 +OH - +H 2 O→[H 3 SiO 4 ] - ；
AlO 2 +OH - +H 2 O→[H 3 AlO 4 ] 2- ；
AlO 2 +OH - +H 2 O→[Al(OH) 6 ] 3- ；
Ca 2+ +[H 3 SiO 4 ] - +[H 3 AlO 4 ] 2- c (A) -S-H (hydrated calcium silicate gel and/or hydrated calcium aluminosilicate gel);
Na + +[H 3 SiO 4 ] - +[H 3 AlO 4 ] 2- N-A-S-H (hydrated sodium aluminosilicate gel).
Further, the specific operation of the step (1) is that the red mud, the mineral powder and the sintering auxiliary agent are added into a mixing kettle and stirred for 2-10min at 1800-2000 r/min; the specific operation of the step (3) is that after the alkali excitation enhancer is added into the premixed dry material, the mixture is stirred for 2-10min at 1200-1500 r/min.
Further, the drying temperature in the step (5) is 80-120 ℃ and the drying time is 12-24 hours; the roasting temperature in the step (6) is 1000-1100 ℃, the heating rate in the roasting process is 5-20 ℃/min, and the heat preservation time is 2-6h.
The invention has the beneficial effects that:
1. the invention uses the solid wastes such as red mud, mineral powder and the like as the main materials of the solid waste base sintered bricks, the solid wastes have large proportion in the raw materials and high utilization rate, and a large amount of solid wastes can be consumed, so that the solid wastes can be well utilized as resources.
2. The liquid water glass has small dosage, and the prepared solid waste base sintered brick has no obvious phenomena of whiskering and layering in the use process, no damage to the aesthetic degree of the solid waste base sintered brick and long service life.
3. The sintering aid containing nano alumina is used as an auxiliary material, so that a remarkable sintering promoting effect can be generated on a sintering system, the sintering process is accelerated, the sintering temperature is reduced, the production energy consumption of solid waste-based sintered bricks is reduced, and the resource utilization rate is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a physical view of the solid waste-based sintered brick produced in example 1.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The ore powder used in the following examples 1 to 8 was grade S105 provided by Long Ze water purification materials Co., ltd. In Henan, and the main components were silica, alumina, ferric oxide, calcium oxide, magnesium oxide, etc.; the red mud is taken from Shandong Ping, and comprises ferric oxide, silicon dioxide, sodium oxide, calcium oxide, titanium dioxide and the like as main components.
Example 1
The preparation method of the solid waste base sintered brick comprises the following steps:
(1) 70kg of mineral powder, 30kg of red mud and 0.5kg of nano alumina are added into a mixing kettle, and are stirred for 2min at 1800r/min to be uniformly mixed, so as to obtain premixed dry materials;
(2) Mixing and stirring 10kg of nano micro silicon powder, 10kg of liquid water glass and 15kg of water to obtain an alkali excitation reinforcing agent, wherein the particle size of the nano micro silicon powder is 100-200nm, and the modulus of the water glass is 1.5-2.0;
(3) Adding an alkali excitation enhancer into the premixed dry material, and stirring for 2min at 1200r/min to obtain a cementing material;
(4) Placing the cementing material into a mould, and performing vibration molding to obtain a green brick;
(5) And (3) drying the green bricks at 100 ℃ for 16 hours to obtain dried green bodies.
(6) Uniformly placing the dried green bodies at intervals in a high-temperature furnace for roasting, wherein the roasting temperature is 1050 ℃, the heating rate in the roasting process is 15 ℃/min, the heat preservation time is 4 hours, and cooling along with the furnace or directly taking out after the roasting is finished, so as to obtain the solid waste-based sintered brick.
Example 2
The preparation method of the solid waste base sintered brick comprises the following steps:
(1) Mixing nano alumina and mica powder in a ratio of 1:1 to obtain a sintering aid, adding 50kg of mineral powder, 50kg of red mud and 0.5kg of the sintering aid into a mixing kettle, and stirring for 10min at 2000r/min to obtain a premixed dry material;
(2) Mixing and stirring 10kg of nano micro silicon powder, 10kg of liquid water glass and 15kg of water to obtain an alkali excitation reinforcing agent, wherein the particle size of the nano micro silicon powder is 100-200nm, and the modulus of the water glass is 1.5-2.0;
(3) Adding an alkali excitation enhancer into the premixed dry material, and stirring for 10min at 1500r/min to obtain a cementing material;
(4) Placing the cementing material into a mould, and performing vibration molding to obtain a green brick;
(5) And (3) drying the green bricks at 100 ℃ for 16 hours to obtain dried green bodies.
(6) Uniformly placing the dried green bodies at intervals in a high-temperature furnace for roasting, wherein the roasting temperature is 1050 ℃, the heating rate in the roasting process is 15 ℃/min, the heat preservation time is 4 hours, and cooling along with the furnace or directly taking out after the roasting is finished, so as to obtain the solid waste-based sintered brick.
Example 3
The preparation method of the solid waste base sintered brick is basically the same as that of the example 2, except that: the adding amount of the nano-micro silicon powder in the step (2) is 5kg.
Example 4
The preparation method of the solid waste base sintered brick is basically the same as that of the example 2, except that: step (2) no nano-silica powder is added;
example 5
The preparation method of the solid waste base sintered brick is basically the same as that of the example 2, except that: the sintering temperature in the step (6) is 1000 ℃.
Example 6
The preparation method of the solid waste base sintered brick is basically the same as that of the example 2, except that: the sintering temperature in the step (6) is 1100 ℃.
Example 7
The preparation method of the solid waste base sintered brick is basically the same as that of the example 2, except that: the addition amount of the sintering aid in the step (1) is 1kg, and the sintering temperature in the step (6) is 1000 ℃.
The solid waste base sintered bricks prepared in the examples 1-7 are subjected to strength measurement on a test piece according to the building mortar basic performance test method standard (JGJ/T70-2009), and a compression test is carried out by adopting a DYE-300N pressure tester and is loaded at a constant speed of 2400N/s+/-200N/s; and the solid waste-based aluminosilicate landscape sintered bricks prepared in examples 1-7 were placed in a dark place for 28 days to observe the phenomenon of efflorescence, and the test results are shown in table 1.
TABLE 1 compressive Strength and results of test for the salt-forming condition
It can be seen that none of the solid waste-based sintered bricks of examples 1 to 7 had a efflorescence phenomenon.
The comparison of the examples 2-4 shows that the addition of the nano micro silicon powder into the raw materials of the solid waste base sintered bricks has excellent promotion effect on the brick body strength, and the corresponding nano micro silicon powder addition amount can be selected according to the requirement on the brick body strength in construction;
as is clear from a comparison of examples 2 and examples 5 to 7, the compressive strength of the solid waste-based sintered bricks is positively correlated with the sintering temperature in the temperature range of 1000 to 1100 ℃, but the addition of the sintering aid is increased to some extent to compensate the loss of compressive strength caused by the decrease of temperature, so that the addition of an appropriate amount of the sintering aid can reduce the temperature required for sintering on the premise of maintaining the brick body strength.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (8)
1. The solid waste base baked brick is characterized by comprising the following raw materials in parts by weight:
100 parts of solid waste, 0.5-1 part of sintering aid, 5-10 parts of nano micro silicon powder, 10-20 parts of liquid sodium silicate and 10-20 parts of water; the solid waste comprises 0-50 parts of red mud and 50-100 parts of mineral powder.
2. The solid waste-based sintered brick of claim 1, wherein the sintering aid is nano-alumina, or a combination of nano-alumina with talc and/or mica powder.
3. The solid waste-based sintered brick of claim 1, wherein the nano silica fume has a particle size of 20-200nm.
4. The solid waste-based sintered brick of claim 1, wherein the mineral powder is S105 grade mineral powder, and the main components include silica, aluminum oxide, ferric oxide, calcium oxide and magnesium oxide.
5. The solid waste-based baked brick of claim 1, wherein the liquid water glass has a modulus of 1.0 to 2.5.
6. A method for preparing the solid waste-based sintered brick as claimed in claim 1, comprising the steps of:
(1) Uniformly mixing the solid waste with a sintering aid to obtain a premixed dry material;
(2) Mixing and stirring nano silica fume and liquid water glass with water to obtain an alkali excitation reinforcing agent;
(3) Adding an alkali excitation reinforcing agent into the premixed dry material, and stirring and mixing to obtain a cementing material;
(4) Placing the cementing material into a mould, and performing vibration molding to obtain a green brick;
(5) Drying the green bricks to obtain dried green bricks;
(6) And uniformly placing the dried green bodies at intervals in a high-temperature furnace for roasting, and cooling or directly taking out along with the furnace after roasting is finished to obtain the solid waste base sintered bricks.
7. The preparation method of claim 6, wherein the specific operation of the step (1) is that solid waste, nano silica fume and sintering aid are added into a mixing kettle and stirred for 2-10min at 1800-2000 r/min; the specific operation of the step (3) is that after the alkali excitation enhancer is added into the premixed dry material, the mixture is stirred for 2-10min at 1200-1500 r/min.
8. The preparation method according to claim 6, wherein the drying temperature in the step (5) is 80-120 ℃ and the drying time is 12-24 hours; the roasting temperature in the step (6) is 1000-1100 ℃, the heating rate in the roasting process is 5-20 ℃/min, and the heat preservation time is 2-6h.
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