CN115504697B - Method for preparing geopolymer cement by utilizing industrial waste - Google Patents
Method for preparing geopolymer cement by utilizing industrial waste Download PDFInfo
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- CN115504697B CN115504697B CN202211163882.4A CN202211163882A CN115504697B CN 115504697 B CN115504697 B CN 115504697B CN 202211163882 A CN202211163882 A CN 202211163882A CN 115504697 B CN115504697 B CN 115504697B
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- 239000011413 geopolymer cement Substances 0.000 title claims abstract description 29
- 229920003041 geopolymer cement Polymers 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002440 industrial waste Substances 0.000 title claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 46
- 239000004568 cement Substances 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000002699 waste material Substances 0.000 claims abstract description 25
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims abstract description 15
- 230000003647 oxidation Effects 0.000 claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 238000007873 sieving Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 39
- 239000003077 lignite Substances 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 239000003513 alkali Substances 0.000 claims description 9
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000012266 salt solution Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 229920000876 geopolymer Polymers 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002802 bituminous coal Substances 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910017090 AlO 2 Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910052622 kaolinite Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910017121 AlSiO Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052661 anorthite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- GWWPLLOVYSCJIO-UHFFFAOYSA-N dialuminum;calcium;disilicate Chemical group [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] GWWPLLOVYSCJIO-UHFFFAOYSA-N 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000011396 hydraulic cement Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- 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
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of preparing cement by using ground polymerized water, in particular to a method for preparing ground polymerized cement by using industrial waste, which comprises the following steps: s1, crushing and grinding bottom slag of a boiler, and sieving to obtain bottom slag with the grain diameter smaller than 150 mu m; s2, drying the screened bottom slag for a period of time, and taking the dried bottom slag as a ground cement basic component, and recording as A; s3, taking aluminum alloy anodic oxidation alkaline washing waste liquid, and marking as B; s4, mixing the materials A and B according to the mass ratio of 60-80:20-40, and vibrating the slurry obtained by uniformly stirring for a period of time to obtain the geopolymer cement; the invention prepares the waste into the ground cement, changes waste into valuable, can replace part of traditional cement, reduces the traditional cement requirement, further reduces the energy consumption and reduces the carbon emission.
Description
Technical Field
The invention relates to the technical field of preparation of geopolymer cement, in particular to a method for preparing the geopolymer cement by utilizing industrial waste.
Background
Cement is mainly of two types: hydraulic cement and geopolymeric cement. The geopolymeric cement is produced by mineral polycondensation, i.e. mineral synthesis, caused by alkali activation, in contrast to conventional hydraulic binders, in which hydration of calcium aluminate and calcium silicate results in hardening.
The existing geopolymerization cement is basically produced by calcium geopolymerization of geological elements rich in ferric oxide and ferric kaolinite, and the geological elements of ferric kaolinite formed in weathering acidic rock such as granite or gneiss, or alkaline rock (iron-magnesia) such as basalt and gabbro. The raw materials are not easy to obtain and have high price, and the production is greatly restricted. Therefore, it is important to reduce the production cost of the geopolymer cement and to obtain cement with high strength and high performance.
Cement production is however an energy intensive industrial process, and a large amount of energy consumption results in a large amount of carbon dioxide emissions. This contradicts the current trend of environmental protection, and the traditional cement production process is urgently required to be replaced by a new environment-friendly process.
Disclosure of Invention
The inventor utilizes the waste generated in the working environment to recycle, thereby not only reducing the harm and the pollution caused by the waste emission, but also changing waste into valuables. In particular, in the anodic oxidation process flow of aluminum alloy, alkali washing is a very important process, and plays a vital role in the surface quality of aluminum materials. The procedure generally uses a solution with sodium hydroxide (NaOH) as a main component, and the NaOH solution must be replaced after being used many times, so that an aluminum alloy anodized alkaline waste liquid occurs, and acid needs to be added to neutralize the aluminum alloy before the aluminum alloy is discharged into the environment, which means that the production cost is increased, and if the aluminum alloy can be utilized, the production cost can be reduced and the income can be created. In addition, the invention produces a large amount of boiler bottom slag in a power station boiler in an artificial environment, and a large amount of bottom slag is piled up to pollute the environment. The inventor finds that the two are recycled and made into various-property geopolymer cements by adopting different proportions to replace the conventional cement so as to save energy consumption and reduce carbon emission, and the geopolymer cement with higher strength can be obtained after treatment.
The invention aims to provide a method for preparing geopolymer cement by utilizing industrial waste, and more particularly relates to a method for preparing geopolymer cement by utilizing boiler bottom slag and aluminum industrial wastewater.
The embodiment of the invention is realized by the following technical scheme:
a method for preparing geopolymer cement from industrial waste, comprising the steps of:
s1, crushing and grinding bottom slag of a boiler, and sieving the crushed and ground bottom slag under 100-150 meshes to obtain bottom slag with the particle size smaller than 150 mu m;
s2, drying the screened bottom slag at 80-150 ℃ for 24-48 hours, and taking the dried bottom slag as a ground cement basic component, and marking the ground cement basic component as A;
s3, taking aluminum alloy anodic oxidation alkaline washing waste liquid, and marking as B;
s4, mixing the materials A and B according to the mass ratio of 60-80:20-40, and vibrating the slurry obtained by uniformly stirring for a period of time to obtain the geopolymer cement.
Further, modified silica may be added in S4, i.e., when mixing a and B, the modified silica is added while mixing, specifically, the amount of the modified silica is added in an amount of 20 to 40% by mass of a; specifically, the modified silica is prepared by embedding silica with aluminum salt, and the preparation method comprises the following steps: dropwise adding alkali liquor and aluminum salt solution into the silicon dioxide dispersion liquid under the stirring state, and keeping the pH value between 11.5 and 12.5; after the dripping is completed, regulating the solution to be neutral, preserving heat and curing for a period of time, filtering, washing, drying at 110-120 ℃ and grinding to obtain the modified silicon dioxide.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
1. the raw materials adopted by the invention are industrial waste materials, and have positive effects on environmental protection. Meanwhile, the waste is utilized, the waste is made into the ground cement, waste is changed into valuable, part of traditional cement can be replaced, the traditional cement requirement is reduced, the energy consumption is further reduced, and the carbon emission is reduced.
2. The bottom slag of the boiler can be preferably selected from lignite bottom slag to synthesize cement, and when the ratio of the bottom slag of the boiler to the aluminum alloy anodic oxidation alkaline washing waste liquid is 60-80:20-40, especially 75:25, the cement is optimally polymerized. Specifically, under the cooperation of boiler bottom slag and aluminum alloy anodic oxidation alkali washing waste liquid, aluminosilicate raw materials are dissolved in alkaline solution, and the dissolved aluminum-silicon complex diffuses from the surface of solid particles to the gaps of particles, and gel phase M { SiO } 2 )z—AlO 2 }n·wH 2 O, resulting in polymerization between the alkali silicate solution and the aluminum silicon complex; the gel phase gradually removes the residual moisture, and is solidified and hardened into mineral polymer material blocks, so that the strength of the geopolymer cement is greatly improved.
Drawings
FIG. 1 shows the compressive strength of samples of examples and comparative examples of the present invention;
FIG. 2 is a graph showing bulk densities of samples of examples and comparative examples of the present invention;
FIG. 3 shows the surface porosities of samples of examples and comparative examples according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The method for preparing geopolymer cement by using industrial waste provided in the embodiment of the invention is specifically described below.
A method for preparing geopolymer cement from industrial waste, comprising the steps of:
s1, crushing and grinding bottom slag of a boiler, and sieving the crushed and ground bottom slag under 100-150 meshes to obtain bottom slag with the particle size smaller than 150 mu m;
s2, drying the screened bottom slag at 80-150 ℃ for 24-48 hours, and taking the dried bottom slag as a ground cement basic component, and marking the ground cement basic component as A;
s3, taking aluminum alloy anodic oxidation alkaline washing waste liquid, and marking as B;
s4, mixing the materials A and B according to the mass ratio of 6-8:2-4, and vibrating the slurry obtained by uniformly stirring for a period of time to obtain the geopolymer cement.
Further, modified silica may be added in S4, i.e., when mixing a and B, the modified silica is added while mixing, specifically, the amount of the modified silica is added in an amount of 20 to 40% by mass of a; specifically, the modified silica is prepared by embedding silica with aluminum salt, and the preparation method comprises the following steps: dropwise adding alkali liquor and aluminum salt solution into the silicon dioxide dispersion liquid under the stirring state, and keeping the pH value between 11.5 and 12.5; after the dripping is completed, regulating the solution to be neutral, preserving heat and curing for a period of time, filtering, washing, drying at 110-120 ℃ and grinding to obtain the modified silicon dioxide.
The raw materials adopted by the inventor are industrial waste materials, and have positive effects on environmental protection. Meanwhile, the waste is utilized, the waste is made into the ground cement, waste is changed into valuable, part of traditional cement can be replaced, the traditional cement requirement is reduced, the energy consumption is further reduced, and the carbon emission is reduced.
Specifically, the bottom slag of the boiler can be selected to be synthesized with the cement by using lignite, each physical property of the cement is higher than that of the soft coal bottom slag, and the strength of the geopolymer depends on the aluminum content in a sample and is inversely proportional to the elemental silicon-aluminum ratio of the raw material for synthesizing the geopolymer. In addition, the lignite bottom slag sample has high calcium content, which is another reason for the strong physical properties of the lignite bottom slag synthetic ground cement.
In addition, the inventor has found through theoretical research, namely practice: when the ratio of the boiler bottom slag to the aluminum alloy anodic oxidation alkali wash waste liquid is 60-80:20-40, especially 75:25, the cement strength is polymerized locallyOptimally. Specifically, under the cooperation of boiler bottom slag and aluminum alloy anodic oxidation alkali washing waste liquid, aluminosilicate raw materials are dissolved in alkaline solution, and the dissolved aluminum-silicon complex diffuses from the surface of solid particles to the gaps of particles, and gel phase M { SiO } 2 )z—AlO 2 }n·wH 2 O, resulting in polymerization between the alkali silicate solution and the aluminum silicon complex; the gel phase gradually removes the residual moisture, and is solidified and hardened into mineral polymer material blocks, so that the strength of the geopolymer cement is greatly improved.
More importantly, the modified silicon dioxide is added in the preparation process, the surface of the silicon dioxide treated by the aluminum salt has hydrophobicity, and the silicon dioxide can be effectively prevented from being combined with a large amount of water molecules in the mixing process with water, so that the hydration degree of cement is more thorough, and the strength of the geopolymerized cement is improved.
Further, the mass ratio of the A material to the B material is 75:25.
Further, the mass ratio of the A material to the B material is 70:30.
Further, the mass ratio of the A material to the B material is 80:20.
Further, the mass ratio of the A material to the B material is 60:40.
Further, the mass ratio of the A material to the B material is 65:35.
Example 1
A method for preparing geopolymer cement from industrial waste, comprising the steps of:
and 1, rapidly grinding lignite bottom slag in a 380rpm crusher for 15 minutes, and screening the bottom slag with the grain size smaller than 150 mu m by using a 100-mesh sieve.
And 2, drying the selected bottom slag for 24 hours at the temperature of 100 ℃ to serve as a ground cement base component, and marking the ground cement base component as A.
And 3, taking the aluminum alloy anodic oxidation alkaline washing waste liquid, and marking as B.
And 4, mixing the materials A and B according to the mass ratio of 75:25, stirring for 15 minutes to obtain uniform slurry, and vibrating for 15 minutes to remove residual air in the slurry.
Step 5, pouring the slurry into a metal cubic die of 50mm x 50mm x 50mm and placing for 48 hours to form a sample.
Step 6, taking out the sample, and after the sample is placed in an air environment for 28 days, performing a performance test, and recording the sample as HM1.
Example 2
This embodiment differs from embodiment 1 in that: step 4 in this embodiment: mixing the materials A and B according to the mass ratio of 70:30, stirring for 15 minutes to obtain uniform slurry, and vibrating for 15 minutes to remove residual air in the slurry.
The remaining implementation steps and conditions were the same as in example 1.
The sample was designated HM2.
Example 3
This embodiment differs from embodiment 1 in that: step 4 in this embodiment: mixing the materials A and B according to the mass ratio of 65:35, stirring for 15 minutes to obtain uniform slurry, and vibrating for 15 minutes to remove residual air in the slurry.
The remaining implementation steps and conditions were the same as in example 1.
The sample was designated HM3.
Example 4
This embodiment differs from embodiment 1 in that: step 4 in this embodiment: mixing the materials A and B according to the mass ratio of 60:30, stirring for 15 minutes to obtain uniform slurry, and vibrating for 15 minutes to remove residual air in the slurry.
The remaining implementation steps and conditions were the same as in example 1.
The sample was designated HM4.
Example 5
This embodiment differs from embodiment 1 in that: step 4 in this embodiment: mixing the materials A and B according to the mass ratio of 75:25, stirring for 15 minutes, adding modified silicon dioxide, mixing to obtain uniform slurry, and vibrating for 15 minutes to remove residual air in the slurry.
Specifically the amount of modified silica is added in 30% of the mass of A; specifically, the modified silicon dioxide is prepared by embedding silicon dioxide through aluminum sulfate solution, and the preparation method comprises the following steps: dropwise adding sodium hydroxide and aluminum sulfate solution into the silicon dioxide dispersion liquid under stirring, and keeping the pH at 11.5; after the dripping is completed, the solution is regulated to be neutral, and is cured for 5 hours under the heat preservation, filtered, washed, dried and ground at the temperature of 110 ℃ to obtain the modified silicon dioxide.
The remaining implementation steps and conditions were the same as in example 1.
The sample was designated HM5.
Comparative examples 1 to 5
In the process for preparing the geopolymer cement in the comparative examples 1 to 5, compared with the comparative examples 1 to 5, the lignite bottom slag sample samples in the comparative examples 1 to 5 are respectively replaced by the bituminous coal bottom slag: the samples of comparative examples 1 to 5 were designated YM1 to YM5, respectively.
In addition, ash content of the lignite bottom slag and the bituminous coal bottom slag used in the examples of the present invention, i.e., comparative examples, is shown in table 1; the components of the aluminum alloy anodic oxidation alkaline washing waste liquid are shown in table 2;
table 1 two boiler bottom slag ash analysis (XRF)
TABLE 2 analysis of aluminium alloy anodized alkaline wash effluent composition (XRF)
According to XRD analysis, the main component of lignite bottom slag (HM) in this example is anorthite ((Ca, na) Al) 2 Si 2 O 8 ) And the minor component is Huang Liudan (CaFe 3 AlSiO 6 ) Quartz (SiO) 2 ) Mullite (Al) 6 Si 2 O1 3 ) And cristobalite (SiO) 2 ). The main crystal phase of the bituminous coal bottom slag (YM) is quartz (SiO) 2 ) The secondary crystal phase consists of mullite (Al 6Si 2 O 13 ) And cristobalite (SiO) 2 ) Composition is prepared.
Experimental example
The compressive strength, bulk density and surface porosity of each sample were measured for each of the obtained examples HM1 to HM5 and comparative examples YM1 to YM5, and the physical properties of each example are shown in FIGS. 1 to 3.
From fig. 1 to 3, it is clear that the physical properties of the synthetic ground cement of the lignite bottom slag are higher than those of the lignite bottom slag. First, the strength of a geopolymer depends on the aluminum content in the sample and is inversely proportional to the elemental silicon-to-aluminum ratio of the raw materials used to synthesize the geopolymer. As shown in tables 1 and 2, the silicon to aluminum ratio of HM was 2.05, and the silicon to aluminum ratio of YM was 2.8. In addition, the cement polymer of the invention shows the best performance when the ratio of the boiler bottom slag to the aluminum alloy anodic oxidation alkali wash waste liquid is 75:25. The amount of the aluminum alloy anodic oxidation alkaline washing waste liquid is increased to 30%, 35% and 40%, the aluminum alloy anodic oxidation alkaline washing waste liquid is excessive, the cement strength is reduced, and the surface porosity is increased, so that the fineness and strength of the cement surface particles are weakened, the gaps among the cement particles are larger, and the cement stone is difficult to reach a very compact degree. Thus, the present invention also preferably exhibits optimal performance when the boiler bottom slag (especially lignite bottom slag) to aluminum alloy anodized alkaline wash liquor ratio is 75:25.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for preparing a geopolymer cement from industrial waste, comprising the steps of:
s1, crushing, grinding and sieving bottom slag of a boiler, wherein the bottom slag of the boiler is lignite;
s2, drying the screened bottom slag for a period of time, and taking the dried bottom slag as a ground cement basic component, and recording as A;
s3, taking aluminum alloy anodic oxidation alkaline washing waste liquid, and marking as B;
s4, mixing the materials A and B according to a mass ratio of 60-80:20-40, and simultaneously adding modified silicon dioxide, wherein the modified silicon dioxide is prepared by embedding silicon dioxide through aluminum salt; and (5) vibrating the slurry obtained by uniformly stirring for a period of time to obtain the geopolymer cement.
2. The method for preparing a geopolymer cement using industrial waste according to claim 1, wherein the mass ratio of the two materials a and B is 75:25.
3. The method for preparing a geopolymer cement by using industrial waste according to claim 1, wherein the mass ratio of the two materials a and B is 70:30.
4. The method for preparing a geopolymer cement by using industrial waste according to claim 1, wherein the mass ratio of the two materials A and B is 80:20.
5. The method for preparing a geopolymer cement using industrial waste according to claim 1, wherein the mass ratio of the two materials a and B is 60:40.
6. The method for preparing a geopolymer cement by using industrial waste according to claim 1, wherein the mass ratio of the two materials A and B is 65:35.
7. The method for preparing a geopolymer cement using industrial waste according to claim 1, wherein the modified silica is prepared by the following steps: dropwise adding alkali liquor and aluminum salt solution into the silicon dioxide dispersion liquid in a stirring state, and keeping the pH value between 11.5 and 12.5; after the dripping is completed, regulating the solution to be neutral, preserving heat and curing for a period of time, filtering, washing, drying at 110-120 ℃ and grinding to obtain the modified silicon dioxide.
8. The method for preparing a geopolymer cement using industrial waste according to claim 1, wherein the step of screening in S1: screening was performed at 100-150 mesh.
9. The method for preparing a geopolymer cement using industrial waste according to claim 1, wherein the drying is performed at 80-150 ℃ for 24-48 hours in S2.
Priority Applications (1)
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Citations (2)
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|---|---|---|---|---|
| CN101879746A (en) * | 2010-06-23 | 2010-11-10 | 南京大学 | Method for preparing circulating fluid bed (CFB) bottom slag base polymer material |
| EP4015480A2 (en) * | 2020-12-18 | 2022-06-22 | Technische Universität Bergakademie Freiberg | Residual material-based composition for the preparation of a geopolymer light stone; geopolymer light stone, method for its preparation and its use |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101879746A (en) * | 2010-06-23 | 2010-11-10 | 南京大学 | Method for preparing circulating fluid bed (CFB) bottom slag base polymer material |
| EP4015480A2 (en) * | 2020-12-18 | 2022-06-22 | Technische Universität Bergakademie Freiberg | Residual material-based composition for the preparation of a geopolymer light stone; geopolymer light stone, method for its preparation and its use |
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| Title |
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| 房永广等.《赤泥资源化利用理论及技术》.中国建材工业出版社,2020,(第1版),第73-74页. * |
| 曲烈等.《现代生土材料的性能与应用》.天津大学出版社,2017,(第1版),第101-102页. * |
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