CN117923877A - Method for preparing water permeable brick by using aluminum ash - Google Patents
Method for preparing water permeable brick by using aluminum ash Download PDFInfo
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- CN117923877A CN117923877A CN202311580043.7A CN202311580043A CN117923877A CN 117923877 A CN117923877 A CN 117923877A CN 202311580043 A CN202311580043 A CN 202311580043A CN 117923877 A CN117923877 A CN 117923877A
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- aluminum ash
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- permeable brick
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 239000011449 brick Substances 0.000 title claims abstract description 89
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 84
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000010802 sludge Substances 0.000 claims abstract description 70
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 50
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000013078 crystal Substances 0.000 claims abstract description 34
- 239000000853 adhesive Substances 0.000 claims abstract description 31
- 230000001070 adhesive effect Effects 0.000 claims abstract description 31
- 239000011159 matrix material Substances 0.000 claims abstract description 25
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 17
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000001354 calcination Methods 0.000 claims abstract description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 20
- 239000003921 oil Substances 0.000 claims description 19
- 239000011230 binding agent Substances 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 12
- 238000004132 cross linking Methods 0.000 claims description 9
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000010902 straw Substances 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- 239000000920 calcium hydroxide Substances 0.000 claims description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- 238000011282 treatment Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000011978 dissolution method Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000012188 paraffin wax Substances 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- IQDXNHZDRQHKEF-UHFFFAOYSA-N dialuminum;dicalcium;dioxido(oxo)silane Chemical compound [Al+3].[Al+3].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O IQDXNHZDRQHKEF-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 239000000404 calcium aluminium silicate Substances 0.000 description 10
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 10
- 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 10
- 229940078583 calcium aluminosilicate Drugs 0.000 description 10
- 239000011499 joint compound Substances 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 8
- 229910001385 heavy metal Inorganic materials 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- QPILZZVXGUNELN-UHFFFAOYSA-M sodium;4-amino-5-hydroxynaphthalene-2,7-disulfonate;hydron Chemical compound [Na+].OS(=O)(=O)C1=CC(O)=C2C(N)=CC(S([O-])(=O)=O)=CC2=C1 QPILZZVXGUNELN-UHFFFAOYSA-M 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 239000011941 photocatalyst Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004520 agglutination Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- -1 aluminum ions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000005591 charge neutralization Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Landscapes
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The application discloses a method for preparing water permeable bricks by using aluminum ash, belonging to the technical field of environmental engineering; the method comprises the following steps: s1, manufacturing a water permeable brick matrix taking black and odorous water body substrate sludge as a main raw material, and uniformly adding nano titanium dioxide into the water permeable brick matrix; s2, preparing oily sludge, and preparing a dirty oil sludge adhesive by using the oily sludge; s3, treating aluminum ash, preparing liquid polyaluminium chloride, and crystallizing the liquid polyaluminium chloride to obtain powdery polyaluminium chloride; s4, adding powdery polyaluminium chloride into the aluminum ash and grinding again, wherein the ground aluminum ash mixture is crosslinked with a dirty oil sludge adhesive to generate crystals coated on the water permeable brick matrix; s5, calcining the water permeable brick matrix coated by the crystals to obtain the water permeable brick loaded with nano titanium dioxide. The application can greatly increase the strength of the water permeable brick after molding and can improve the bonding capability of the titanium dioxide and the water permeable brick.
Description
Technical Field
The invention provides a method for preparing water permeable bricks by using aluminum ash, and belongs to the technical field of environmental engineering.
Background
With the acceleration of the urban process in China, the problem of black and odorous water bodies is more serious in many cities, especially in south China, and urgent treatment is needed. One of the important factors restricting the black and odorous treatment effect is the pollution of the bottom mud, and a large amount of pollutants are accumulated in the bottom mud, so that the bottom mud is an important secondary pollution source for causing water pollution. The large amount of sediment produced in dredging works is also a great difficulty in engineering disposal, and its handling and disposal are prominent problems in current black and odorous treatments. The prior art utilizes the sediment to prepare the water permeable brick, so that the pollution problem of the sediment can be solved, and the water permeability of the brick body sintered by the sediment can be utilized to relieve urban waterlogging, thereby achieving two purposes.
Publication number CN110183204A discloses a water permeable brick loaded with nano titanium dioxide and a preparation method thereof, and discloses a water permeable brick matrix prepared by adopting bottom mud, a binder and straw residues as raw materials, and impregnating a titanium dioxide precursor suspension on the water permeable brick matrix by a multi-time impregnation method, wherein nano titanium dioxide is uniformly embedded in pores of the water permeable brick matrix after calcination.
The above disclosure suffers from the following disadvantages: as the manufacturing raw materials of the water permeable brick are bottom mud, sand and slag in the bottom mud can form a pore structure, so that the water permeability of the brick body is improved, but the strength of the water permeable brick is also reduced; meanwhile, the fixation effect of titanium dioxide loaded by the titanium dioxide precursor suspension is poor, and when the water permeable brick is used, the loaded titanium dioxide is easy to wash away and fall off by water, so that the loss of a photocatalyst is caused, and the self-cleaning effect of the water permeable brick is affected.
Disclosure of Invention
According to the method for preparing the water permeable brick by using the aluminum ash, disclosed by the invention, the sludge binder and the aluminum ash are used for reacting and crosslinking to generate crystals coated on the bottom mud, so that the strength of the formed water permeable brick can be greatly increased, and the carbon source in the sludge binder is used for adsorbing titanium dioxide, so that the binding capacity of the titanium dioxide and the water permeable brick is improved.
In order to solve the problems, the technical scheme provided by the invention is as follows: a method for preparing water permeable bricks by using aluminum ash comprises the following steps: s1, manufacturing a water permeable brick matrix taking black and odorous water body substrate sludge as a main raw material, and uniformly adding nano titanium dioxide into the water permeable brick matrix; s2, preparing oily sludge, and preparing a dirty oil sludge adhesive by using the oily sludge; s3, treating aluminum ash, preparing liquid polyaluminium chloride, and crystallizing the liquid polyaluminium chloride to obtain powdery polyaluminium chloride; s4, adding powdery polyaluminium chloride into the aluminum ash and grinding again, wherein the ground aluminum ash mixture is crosslinked with a dirty oil sludge adhesive to generate crystals coated on the water permeable brick matrix; s5, calcining the water permeable brick matrix coated by the crystals to obtain the water permeable brick loaded with nano titanium dioxide.
As an improvement, in the step S1, the addition amount of the bottom mud is 85%, the binder is 15%, the straw slag is 0.4%, and the load amount of the nano titanium dioxide is 0.2 g/brick.
In the step S5, the porous brick substrate loaded with titanium dioxide is sintered at 1100 ℃ for 1h.
As an improvement, in step S2, the oily sludge is pretreated in the following specific treatment modes: crushing the oily sludge until the particle size is less than 8mm, sending the crushed oily sludge to a settling tank, adding a certain amount of adhesive and water under the stirring effect, uniformly mixing, centrifugally separating, and removing middle-layer water to obtain the dirty oil sludge adhesive consisting of oil, soil and adhesive.
As an improvement, in the step S3, aluminum ash and hydrochloric acid are used as raw materials to prepare liquid polyaluminium chloride by an acid dissolution method; firstly, pretreating aluminum ash, and removing water-soluble salts by using a water washing method to reduce the consumption of hydrochloric acid; adding 30% of alumina in the treated aluminum ash, preparing hydrochloric acid solution, heating to a certain temperature, weighing the aluminum ash, gradually adding hydrochloric acid solution, continuously stirring, adding water, controlling the reaction time to be 6-12 h, controlling the reaction temperature to be 96 ℃, adding water to dilute materials after the reaction is finished, adjusting the pH value to be 3.5-4.5, precipitating for 15-24h to obtain liquid polyaluminium chloride, and crystallizing to separate out powdery polyaluminium chloride.
As an improvement, in the step S4, the content of alumina in the aluminum ash is 70 percent, and the content of calcium oxide is 2 percent; the mixing ratio of the powdery polyaluminum chloride to the aluminum ash is 2:8, and the mixing grinding granularity of the powdery polyaluminum chloride and the aluminum ash is 400-500 meshes.
As an improvement, in the step S4, water is added in the process of crosslinking the aluminum ash mixture and the sludge adhesive, and the water reacts with calcium oxide to generate calcium hydroxide; organic matters and impurities in the sludge adhesive are crosslinked with aluminum oxide and calcium hydroxide in aluminum ash to generate crystals of calcium aluminum silicate gel.
In a modified form, in step S4, a stabilizer, which may be a zirconate or titanate, is added to the aluminum ash mixture sludge binder during crosslinking to alter the crystal structure of the calcium alumino silicate gel during its crystal formation.
As improvement, in the step S2, the content of asphaltene in the oil-containing sludge is 8-12%, the content of paraffin is 5-8%, the oil content is more than or equal to 40%, and the ash content is 3-5%; the mixing ratio of the adhesive to the oily sludge is 4:6; the large amount of carbon source in the oily sludge has the effect of adsorbing titanium dioxide.
The invention has the beneficial effects that:
1. According to the method for preparing the water permeable brick, the nano titanium dioxide is loaded on the water permeable brick, so that the water permeable brick has a water permeable function, and the titanium dioxide can be used as a photocatalyst to catalyze and degrade pollutants penetrating through the brick body and some pollutants attached to the surface of the brick body, so that the self-cleaning performance is good, and the service life of a water permeable brick substrate is effectively prolonged.
2. The aluminum ash mixture is crosslinked with the sludge adhesive to generate crystals coated on the water permeable brick matrix; the carbon source in the sludge adhesive can play a role in adsorbing titanium dioxide, so that the bonding capacity of the titanium dioxide and the water permeable bricks is improved, the loss of the titanium dioxide loaded on the water permeable bricks is avoided, and the self-cleaning function time of the water permeable bricks is prolonged; meanwhile, the crystals of the calcium aluminosilicate gel are coated on the water permeable brick matrix, so that the strength of the water permeable brick can be greatly increased. Meanwhile, the addition of the stabilizing agents such as zirconate or titanate can change the crystal structure of the calcium aluminosilicate gel in the process of forming the crystal, so that the high-temperature resistance of the calcium aluminosilicate gel is improved, and the crystal structure is not damaged when the brick body is calcined at high temperature.
3. Treating aluminum ash, preparing liquid polyaluminium chloride, and crystallizing the liquid polyaluminium chloride to obtain powdery polyaluminium chloride; the powdered polyaluminium chloride is prepared from aluminum ash, and is a high-performance inorganic polymeric flocculant, and has the characteristics of large molecular structure, strong adsorption capacity, strong agglutination capacity, large formed floccules and small addition amount, and the flocculating settling speed is high, so that the color matters and heavy metal ions in water can be effectively removed, and the cleaning effect is improved.
Drawings
FIG. 1 is a flow chart of a method for preparing water permeable bricks by using aluminum ash.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
According to the illustration in fig. 1: the invention provides a method for preparing a water permeable brick by using aluminum ash, which comprises the following steps: the method comprises the following steps: s1, manufacturing a water permeable brick matrix taking black and odorous water body substrate sludge as a main raw material, and uniformly adding nano titanium dioxide into the water permeable brick matrix; s2, preparing oily sludge, and preparing a dirty oil sludge adhesive by using the oily sludge; s3, treating aluminum ash, preparing liquid polyaluminium chloride, and crystallizing the liquid polyaluminium chloride to obtain powdery polyaluminium chloride; s4, adding powdery polyaluminium chloride into the aluminum ash and grinding again, wherein the ground aluminum ash mixture is crosslinked with a dirty oil sludge adhesive to generate crystals coated on the water permeable brick matrix; s5, calcining the water permeable brick matrix coated by the crystals to obtain the water permeable brick loaded with nano titanium dioxide.
In the step S1, the addition amount of the bottom mud is 85%, the binder is 15%, the straw slag is 0.4%, and the load amount of the nano titanium dioxide is 0.2 g/brick.
In the step S5, the porous brick matrix loaded with titanium dioxide is sintered at 1100 ℃ for 1h.
In the step S2, the oily sludge is pretreated in the following specific treatment modes: crushing the oily sludge until the particle size is less than 8mm, sending the crushed oily sludge to a settling tank, adding a certain amount of adhesive and water under the stirring effect, uniformly mixing, centrifugally separating, and removing middle-layer water to obtain the dirty oil sludge adhesive consisting of oil, soil and adhesive.
In the step S3, aluminum ash and hydrochloric acid are used as raw materials to prepare liquid polyaluminium chloride by an acid dissolution method; firstly, pretreating aluminum ash, and removing water-soluble salts by using a water washing method to reduce the consumption of hydrochloric acid; adding 30% of alumina in the treated aluminum ash, preparing hydrochloric acid solution, heating to a certain temperature, weighing the aluminum ash, gradually adding hydrochloric acid solution, continuously stirring, adding water, controlling the reaction time to be 6-12 h, controlling the reaction temperature to be 96 ℃, adding water to dilute materials after the reaction is finished, adjusting the pH value to be 3.5-4.5, precipitating for 15-24h to obtain liquid polyaluminium chloride, and crystallizing to separate out powdery polyaluminium chloride. In the step S4, the content of alumina in the aluminum ash is 70 percent, and the content of calcium oxide is 2 percent; the mixing ratio of the powdery polyaluminum chloride to the aluminum ash is 2:8, and the mixing grinding granularity of the powdery polyaluminum chloride and the aluminum ash is 400-500 meshes.
Aluminum in polyaluminum chloride is present in the form of multivalent ions, such as al3+. The multivalent ions have higher charge density and adsorption capacity and can form chemical complex with heavy metal ions. The chemical complexation can adsorb heavy metal ions through mechanisms such as charge neutralization, electrostatic attraction, ion-matching effect and the like. When water passes through the water permeable bricks, part of aluminum ions can react with hydroxide in the water to generate aluminum hydroxide precipitate. These hydroxide precipitates are capable of adsorbing heavy metal ions and forming solid particles, which are removed or separated. Meanwhile, the polyaluminum chloride has a high molecular structure and polymer characteristics and can form granular aggregates in water. The agglomerates have larger surface area and internal pores, provide more adsorption sites and can effectively capture and adsorb heavy metal ions; therefore, the effect of absorbing heavy metal ions by the water permeable bricks can be improved and the cleaning capacity of the water permeable bricks can be improved by adding the polyaluminium chloride into the aluminum ash.
In the step S4, water is added in the cross-linking process of the aluminum ash mixture and the sludge adhesive, and the water reacts with calcium oxide to generate calcium hydroxide; organic matters and impurities in the sludge adhesive are crosslinked with aluminum oxide and calcium hydroxide in aluminum ash to generate crystals of calcium aluminum silicate gel. In step S4, a stabilizer, which may be a zirconate or titanate, is added during the cross-linking of the sludge binder of the aluminum ash mixture to alter the crystal structure of the calcium aluminosilicate gel during its crystal formation.
The calcium aluminosilicate gel has the characteristics of uniform and continuous micropore structure, low density, large pore diameter, small crystal size, large inner area, high hardness, good chemical stability and the like, so that the calcium aluminosilicate gel can show good strength and hardness and the water permeability of the water permeable brick is not influenced; the crystal structure of calcium aluminosilicate gel is mainly composed of silicate gel and calcium aluminate hydrate crystal structure. After adding zirconate or titanate admixture, the components of the admixture can react with the water permeable brick in the preparation process to generate novel compounds similar to the crystal structure of calcium aluminate hydrate and form microstructures and crystal forms different from those of common cement, so that the high temperature resistance of the water permeable brick is improved.
In the step S2, the content of asphaltene in the oily sludge is 8-12%, the content of paraffin is 5-8%, the oil content is more than or equal to 40%, and the ash content is 3-5%; the mixing ratio of the adhesive to the oily sludge is 4:6; the large amount of carbon source in the oily sludge has the effect of adsorbing titanium dioxide.
Example 1
Taking 2kg of black and odorous water body substrate sludge as a main raw material of the water permeable brick, adding a binder and straw slag, so that the substrate sludge amount is 85% of the water permeable brick substrate, the binder is 15%, the straw slag is 0.4%, and simultaneously preparing 0.2g of nano titanium dioxide. Preparing oily sludge, wherein the asphaltene content in the oily sludge is 8%, the paraffin content is 5%, the oil content is 40%, and the ash content is 3%, and uniformly mixing the adhesive and the oily sludge according to the ratio of 4:6 to prepare the sludge adhesive. Preparing liquid polyaluminium chloride by taking aluminum ash and hydrochloric acid as raw materials and adopting an acid dissolution method; firstly, pretreating aluminum ash, and removing water-soluble salts by using a water washing method to reduce the consumption of hydrochloric acid; adding a hydrochloric acid solution into a reaction kettle, heating to a certain temperature, weighing the aluminum ash, gradually adding the hydrochloric acid solution, continuously stirring and adding water, controlling the reaction time to be 6 hours, controlling the reaction temperature to be 96 ℃, adding water to dilute materials after the reaction is finished, adjusting the pH value to be 3.5, precipitating for 15 hours to obtain liquid polyaluminium chloride, and crystallizing to separate out powdery polyaluminium chloride.
Mixing and grinding aluminum ash with 70% of aluminum oxide and 2% of calcium oxide with powdery polyaluminium chloride, wherein the mixing ratio of the powdery polyaluminium chloride to the aluminum ash is 2:8, mixing and grinding the powdery polyaluminium chloride and the aluminum ash to 400 meshes to obtain an aluminum ash mixture, coating the aluminum ash mixture and a sludge binder on a titanium dioxide and water permeable brick substrate, crosslinking the aluminum ash mixture and the sludge binder, adding zirconate, generating crystals of calcium aluminosilicate gel with a changed crystal structure and high temperature resistance, and coating the crystals on the water permeable brick. And sintering the porous brick matrix loaded with the titanium dioxide, wherein the sintering temperature is 1100 ℃, and the heat preservation time is 1h, so that the porous brick with high strength and difficult detachment of the titanium dioxide is obtained.
Example 2
Taking 2kg of black and odorous water body substrate sludge as a main raw material of the water permeable brick, adding a binder and straw slag, so that the substrate sludge amount is 85% of the water permeable brick substrate, the binder is 15%, the straw slag is 0.4%, and simultaneously preparing 0.2g of nano titanium dioxide. Preparing oily sludge, wherein the asphaltene content in the oily sludge is 12%, the paraffin content is 8%, the oil content is 45%, and the ash content is 5%, and uniformly mixing the adhesive and the oily sludge according to the ratio of 4:6 to prepare the sludge adhesive. Preparing liquid polyaluminium chloride by taking aluminum ash and hydrochloric acid as raw materials and adopting an acid dissolution method; firstly, pretreating aluminum ash, and removing water-soluble salts by using a water washing method to reduce the consumption of hydrochloric acid; adding a hydrochloric acid solution into a reaction kettle, heating to a certain temperature, weighing the aluminum ash, gradually adding the hydrochloric acid solution, continuously stirring and adding water, controlling the reaction time at 12h, controlling the reaction temperature at 96 ℃, adding water to dilute materials after the reaction is finished, adjusting the pH value to 4.5, precipitating for 24h to obtain liquid polyaluminium chloride, and crystallizing to separate out powdery polyaluminium chloride.
Mixing and grinding aluminum ash with 80% of aluminum oxide and 2% of calcium oxide with powdery polyaluminium chloride, wherein the mixing ratio of the powdery polyaluminium chloride to the aluminum ash is 2:8, mixing and grinding the powdery polyaluminium chloride and the aluminum ash to 500 meshes to obtain an aluminum ash mixture, coating the aluminum ash mixture and a sludge binder on a titanium dioxide and water permeable brick substrate, crosslinking the aluminum ash mixture and the sludge binder, adding zirconate, generating crystals of calcium aluminosilicate gel with a changed crystal structure and high temperature resistance, and coating the crystals on the water permeable brick. And sintering the porous brick matrix loaded with the titanium dioxide, wherein the sintering temperature is 1100 ℃, and the heat preservation time is 1h, so that the porous brick with high strength and difficult detachment of the titanium dioxide is obtained.
The invention and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the invention as shown in the drawings.
Claims (9)
1. The method for preparing the water permeable brick by using the aluminum ash is characterized by comprising the following steps of: s1, manufacturing a water permeable brick matrix taking black and odorous water body substrate sludge as a main raw material, and uniformly adding nano titanium dioxide into the water permeable brick matrix; s2, preparing oily sludge, and preparing a dirty oil sludge adhesive by using the oily sludge; s3, treating aluminum ash, preparing liquid polyaluminium chloride, and crystallizing the liquid polyaluminium chloride to obtain powdery polyaluminium chloride; s4, adding powdery polyaluminium chloride into the aluminum ash and grinding again, wherein the ground aluminum ash mixture is crosslinked with a dirty oil sludge adhesive to generate crystals coated on the water permeable brick matrix; s5, calcining the water permeable brick matrix coated by the crystals to obtain the water permeable brick loaded with nano titanium dioxide.
2. The method for preparing the water permeable brick by using the aluminum ash according to claim 1, wherein in the step S1, the addition amount of the bottom mud is 85%, the binder is 15%, the straw slag is 0.4%, and the load amount of the nano titanium dioxide is 0.2 g/brick.
3. The method for preparing the water permeable brick by using the aluminum ash according to claim 2, wherein in the step S5, the water permeable brick matrix loaded with the titanium dioxide is sintered at 1100 ℃ for 1h.
4. The method for preparing the water permeable brick by using the aluminum ash according to claim 1, wherein in the step S2, the oily sludge is pretreated by the following specific treatment modes: crushing the oily sludge until the particle size is less than 8mm, sending the crushed oily sludge to a settling tank, adding a certain amount of adhesive and water under the stirring effect, uniformly mixing, centrifugally separating, and removing middle-layer water to obtain the dirty oil sludge adhesive consisting of oil, soil and adhesive.
5. The method for preparing the water permeable brick by using the aluminum ash according to claim 1, wherein in the step S3, the aluminum ash and the hydrochloric acid are used as raw materials to prepare the liquid polyaluminum chloride by an acid dissolution method; firstly, pretreating aluminum ash, and removing water-soluble salts by using a water washing method to reduce the consumption of hydrochloric acid; adding 30% of alumina in the treated aluminum ash, preparing hydrochloric acid solution, heating to a certain temperature, weighing the aluminum ash, gradually adding hydrochloric acid solution, continuously stirring, adding water, controlling the reaction time to be 6-12 h, controlling the reaction temperature to be 96 ℃, adding water to dilute materials after the reaction is finished, adjusting the pH value to be 3.5-4.5, precipitating for 15-24h to obtain liquid polyaluminium chloride, and crystallizing to separate out powdery polyaluminium chloride.
6. The method for preparing the water permeable brick by using the aluminum ash according to claim 1, wherein in the step S4, the aluminum ash contains 70% -80% of aluminum oxide and 2% of calcium oxide; the mixing ratio of the powdery polyaluminum chloride to the aluminum ash is 2:8, and the mixing grinding granularity of the powdery polyaluminum chloride and the aluminum ash is 400-500 meshes.
7. The method for preparing water permeable bricks by using aluminum ash according to claim 1, wherein in the step S4, water is added in the process of crosslinking the aluminum ash mixture and the sludge binder, and the water reacts with calcium oxide to generate calcium hydroxide; organic matters and impurities in the sludge adhesive are crosslinked with aluminum oxide and calcium hydroxide in aluminum ash to generate crystals of calcium aluminum silicate gel.
8. The method for manufacturing a water permeable brick using aluminum ash according to claim 7, wherein in step S4, a stabilizer, which may be zirconate or titanate, is added during the crosslinking of the sludge binder of the aluminum ash mixture so as to change the crystal structure during the crystal formation of the calcium aluminum silicate gel.
9. The method for preparing the water permeable brick by utilizing the aluminum ash according to claim 1, wherein in the step S2, the asphaltene content in the oil-containing sludge is 8% -12%, the paraffin content is 5% -8%, the oil content is more than or equal to 40%, and the ash content is 3% -5%; the mixing ratio of the adhesive to the oily sludge is 4:6; the large amount of carbon source in the oily sludge has the effect of adsorbing titanium dioxide.
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