CN115504697A - Method for preparing geopolymerized cement by using industrial waste - Google Patents
Method for preparing geopolymerized cement by using industrial waste Download PDFInfo
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- CN115504697A CN115504697A CN202211163882.4A CN202211163882A CN115504697A CN 115504697 A CN115504697 A CN 115504697A CN 202211163882 A CN202211163882 A CN 202211163882A CN 115504697 A CN115504697 A CN 115504697A
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- geopolymerized
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- 239000004568 cement Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002440 industrial waste Substances 0.000 title claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 44
- 239000002699 waste material Substances 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000005406 washing Methods 0.000 claims abstract description 20
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 17
- 230000003647 oxidation Effects 0.000 claims abstract description 15
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 15
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 32
- 239000000243 solution Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000012266 salt solution Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 6
- 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
- 239000003077 lignite Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011413 geopolymer cement Substances 0.000 description 8
- 229920003041 geopolymer cement Polymers 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000002802 bituminous coal Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 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
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- 239000010882 bottom ash Substances 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 229910018125 Al-Si Inorganic materials 0.000 description 2
- 229910017090 AlO 2 Inorganic materials 0.000 description 2
- 229910018520 Al—Si 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009471 action Effects 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
- 238000007743 anodising Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 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
- 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
- 230000008092 positive effect Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000007873 sieving Methods 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
- 230000004913 activation Effects 0.000 description 1
- 229910052661 anorthite Inorganic materials 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 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
- 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
- 238000002474 experimental method Methods 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
- 229910052742 iron Inorganic materials 0.000 description 1
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 229910052907 leucite Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
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- 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 geopolymerized cement preparation, in particular to a method for preparing geopolymerized cement by using industrial waste, which comprises the following steps: s1, crushing, grinding and screening boiler bottom slag, and screening out bottom slag with the particle size of less than 150 microns; s2, drying the screened bottom slag for a period of time, and taking the dried bottom slag as a geopolymeric cement basic component, and recording the component A as A; s3, taking the aluminum alloy anodic oxidation alkali washing waste liquid, and recording the waste liquid as B; s4, mixing the materials A and B according to a mass ratio of 60-80; the waste is made into the geopolymerized cement, so that the waste is changed into valuable, part of the traditional cement can be replaced, the requirement of the traditional cement is reduced, the energy consumption is further reduced, and the carbon emission is reduced.
Description
Technical Field
The invention relates to the technical field of geopolymerized cement preparation, and particularly relates to a method for preparing geopolymerized cement by using industrial waste.
Background
There are two main types of cement: hydraulic cement and geopolymeric cement. Geocement is produced by mineral polycondensation, i.e. mineral synthesis reaction, caused by alkali activation, in contrast to conventional hydraulic binders, in which the hydration of calcium aluminate and calcium silicate leads to hardening.
The existing geopolymeric cement production is basically produced by calcium geopolymeric polymerization of geological elements rich in iron oxide, iron kaolinite, weathered acid rocks such as granite and gneiss, or alkaline rocks (iron magnesium rocks) such as basalt and gabbro. The raw materials are not easy to obtain and have high price, which greatly restricts the production. Therefore, it is important to reduce the production cost of geopolymer cement and obtain cement with high strength and high performance.
However, cement production is an energy intensive industrial process, and the large energy consumption results in a large amount of carbon dioxide emissions. This is in contradiction with the current trend of environmental protection, and the traditional cement production process urgently needs new process replacement for environmental protection.
Disclosure of Invention
The inventor utilizes the waste generated in the working environment for recycling, thereby not only reducing the pollution caused by waste discharge, but also changing waste into valuables. In particular, in the aluminum alloy anodic oxidation process flow, alkaline washing is a very important process, and plays a crucial role in the surface quality of the aluminum material. This procedure generally uses a solution with sodium hydroxide (NaOH) as the main component, which must be replaced after several uses, so that an alkaline waste liquor of anodic oxidation of aluminium alloys appears, which needs to be neutralized by adding acid before being discharged to the environment, which means increasing the production costs, which if they could be utilized could be reduced and revenue could be created. In addition, the power station boiler in the working environment of the inventor generates a large amount of boiler bottom slag, and the large amount of bottom slag is accumulated to pollute the environment. The inventor finds that the two are reused and the cement with multiple properties and textures is prepared by adopting different proportions to replace the conventional cement, so that the energy consumption is saved, the carbon emission is reduced, and the cement with higher strength can be obtained after treatment.
The invention aims to provide a method for preparing geopolymerized cement by using industrial waste, in particular to the method for preparing the geopolymerized cement by using boiler bottom slag and aluminum industrial wastewater.
The embodiment of the invention is realized by the following technical scheme:
a method for preparing geopolymerized cement by using industrial waste comprises the following steps:
s1, crushing and grinding boiler bottom slag, sieving the ground boiler bottom slag under 100-150 meshes, and screening out bottom slag with the particle size of less 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 geopolymeric cement basic component, namely A;
s3, taking the aluminum alloy anodic oxidation alkali washing waste liquid, and recording the waste liquid as B;
s4, mixing the materials A and B according to a mass ratio of 60-80.
Further, modified silica can be added into S4, namely when A and B are mixed, the modified silica is added and mixed at the same time, and specifically, the amount of the modified silica is added according to 20-40% of the mass of A; specifically, the modified silicon dioxide is embedded by 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 dropwise addition is finished, the solution is adjusted to be neutral, and is subjected to heat preservation and curing for a period of time, filtration, washing, drying at the temperature of 110-120 ℃, and grinding to obtain the modified silicon dioxide.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. the raw materials adopted by the invention are industrial waste materials, and have positive effect on environmental protection. Meanwhile, the waste is utilized, the waste is made into geopolymerized cement, waste is changed into valuable, partial traditional cement can be replaced, the requirement of the traditional cement is reduced, and further, the energy consumption and the carbon emission are reduced.
2. The boiler bottom slag can be preferably synthesized by lignite bottom slag, and the strength of the agglomerated cement is optimal when the ratio of the boiler bottom slag to the aluminum alloy anodic oxidation alkali washing waste liquid is (60-80). Specifically, under the coordination action of boiler bottom slag and aluminum alloy anodic oxidation alkaline washing waste liquid, an aluminosilicate raw material is dissolved in an alkaline solution, a dissolved aluminum-silicon complex is diffused from the surface of solid particles to the gaps among the particles, and a gel phase M { - (SiO) 2 )z—AlO 2 }n·wH 2 The formation of O, resulting in polymerization between the alkali silicate solution and the Al-Si complex; the gel phase gradually removes residual water, and is consolidated and hardened into mineral polymer material blocks, so that the strength of the geopolymer cement is greatly improved.
Drawings
FIG. 1 is a graph showing the compressive strength of samples of examples and comparative examples of the present invention;
FIG. 2 is a graph showing the bulk densities of samples of examples and comparative examples of the present invention;
FIG. 3 is a graph of surface porosity for samples of examples and comparative examples of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.
The method for preparing geopolymer cement using industrial waste according to the embodiments of the present invention will be described in detail.
A method for preparing geopolymerized cement by using industrial waste comprises the following steps:
s1, crushing and grinding boiler bottom slag, sieving the crushed and ground boiler bottom slag under a mesh of 100-150 meshes, and screening out bottom slag with the particle size of less 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 geopolymeric cement basic component, namely A;
s3, taking the aluminum alloy anodic oxidation alkali washing waste liquid, and recording the waste liquid as B;
s4, mixing the materials A and B according to a mass ratio of 6-8.
Further, modified silica can be added into S4, namely when A and B are mixed, the modified silica is added and mixed at the same time, and specifically the amount of the modified silica is added according to 20-40% of the mass of A; specifically, the modified silicon dioxide is embedded by 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 dropwise addition is finished, the solution is adjusted to be neutral, and is subjected to heat preservation and curing for a period of time, filtration, washing, drying at the temperature of 110-120 ℃, and grinding to obtain the modified silicon dioxide.
The raw materials adopted by the inventor are industrial waste materials, and have a positive effect on environmental protection. Meanwhile, the waste is utilized, and the waste is prepared into the geopolymer cement, so that waste is changed into valuable, part of the traditional cement can be replaced, the requirement of the traditional cement is reduced, the energy consumption is further reduced, and the carbon emission is reduced.
Specifically, the boiler bottom slag can be synthesized geocement by lignite bottom slag, various physical properties are higher than those of bituminous coal bottom slag, and first, the strength of geopolymer is determined by the content of aluminum in a sample and is inversely proportional to the elemental silicon-aluminum ratio of raw materials for synthesizing geopolymer. In addition, the calcium content of the lignite bottom slag sample is high, which is another reason that the various physical properties of the cohesive cement synthesized by the lignite bottom slag are strong.
In addition, the inventor finds out through theoretical research and practice that: when the ratio of the boiler bottom slag to the aluminum alloy anodic oxidation alkaline washing waste liquid is 60-80, particularly 75. Specifically, under the coordination action of boiler bottom slag and aluminum alloy anodic oxidation alkaline washing waste liquid, an aluminosilicate raw material is dissolved in an alkaline solution, a dissolved aluminum-silicon complex is diffused from the surface of solid particles to the gaps among the particles, and a gel phase M { - (SiO) 2 )z—AlO 2 }n·wH 2 The formation of O, resulting in polymerization between the alkali silicate solution and the Al-Si complex; the gel phase gradually removes residual water, and is consolidated 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 process of mixing with water, so that the hydration degree of cement is more thorough, and the strength of geopolymer cement is improved.
Further, the mass ratio of the two materials A and B is 75.
Further, the mass ratio of the two materials A and B is 70.
Further, the mass ratio of the two materials A and B is 80.
Further, the mass ratio of the two materials A and B is 60.
Further, the mass ratio of the two materials A and B is 65.
Example 1
A method for preparing geopolymerized cement by using industrial waste comprises the following steps:
And 2, drying the selected bottom slag at the environment of 100 ℃ for 24 hours to serve as a geopolymeric cement basic component, and recording the component as A.
And 3, taking the aluminum alloy anode oxidation alkali washing waste liquid, and recording the waste liquid as B.
And 4, mixing the materials A and B according to a mass ratio of 75.
And 6, taking out the sample, and performing a performance test after the sample is placed in an air environment for 28 days, wherein the sample is marked as HM1.
Example 2
The present example differs from example 1 in that: step 4 in this embodiment: mixing the materials A and B according to a mass ratio of 70.
The remaining implementation steps and conditions were the same as in example 1.
The sample is designated HM2.
Example 3
This example differs from example 1 in that: step 4 in this embodiment: mixing the materials A and B according to a mass ratio of 65.
The remaining implementation steps and conditions were the same as in example 1.
The sample is denoted HM3.
Example 4
This example differs from example 1 in that: step 4 in this embodiment: mixing the materials A and B according to a mass ratio of 60.
The remaining implementation steps and conditions were the same as in example 1.
The sample is designated HM4.
Example 5
The present example differs from example 1 in that: step 4 in this embodiment: mixing the materials A and B according to a mass ratio of 75 to 25, stirring for 15 minutes, adding modified silica, mixing to obtain uniform slurry, and vibrating for 15 minutes to remove air remaining in the slurry.
Specifically, the amount of the modified silica is added in an amount of 30% by mass of A; specifically, the modified silicon dioxide is embedded by 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 the stirring state, and keeping the pH value at 11.5; after the dropwise addition is finished, the solution is adjusted to be neutral, and is subjected to heat preservation and curing for 5 hours, filtering, washing, drying at 110 ℃ and grinding to obtain the modified silicon dioxide.
The remaining implementation steps and conditions were the same as in example 1.
The sample is denoted HM5.
Comparative examples 1 to 5
Compared with the process for preparing geopolymer cement in the comparative examples 1 to 5, the lignite bottom slag sample is changed into bituminous coal bottom slag: the samples of comparative examples 1 to 5 are designated YM1 to YM5, respectively.
In addition, it should be noted that the ash content of the lignite bottom ash and the bituminous coal bottom ash used in the examples of the present invention, i.e., the comparative examples, is shown in table 1; the components of the aluminum alloy anodic oxidation alkali washing waste liquid are shown in table 2;
TABLE 1 two boiler bottom ash analysis (XRF)
TABLE 2 aluminium alloy anodizing alkaline washing waste liquid composition analysis (XRF)
According to XRD analysis, the main component of the lignite bottom slag (HM) in the embodiment is anorthite ((Ca, na) Al 2 Si 2 O 8 ) And the minor component is leucite (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 is mullite (Al 6 Si) 2 O 13 ) And cristobalite (SiO) 2 ) And (4) forming.
Examples of the experiments
The obtained example samples HM1 to HM5 and the comparative example samples YM1 to YM5 were measured for compressive strength, bulk density, and surface porosity, respectively, and the physical properties of the examples are shown in fig. 1 to 3.
As can be seen from FIGS. 1 to 3, the physical properties of the geopolymer cement synthesized from the lignite bottom slag are higher than those of the bituminous coal bottom slag. First, the strength of geopolymers 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, HM is 2.05, and YM is 2.8. In addition, when the ratio of the boiler bottom slag to the aluminum alloy anodic oxidation alkaline washing waste liquid is 75. The amount of the aluminum alloy anodic oxidation alkali washing waste liquid is increased to 30%, 35% and 40%, the aluminum alloy anodic oxidation alkali washing waste liquid is excessive, the cement strength is reduced, and the surface porosity is increased, so that the fineness and the strength of cement surface particles are weakened, gaps among the cement particles are large, and cement stones are difficult to reach a very dense degree. Therefore, the present invention preferably also exhibits the best performance when the boiler bottom slag (especially lignite bottom slag) and aluminum alloy anodizing alkaline washing waste liquor ratio is 75.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for preparing geopolymerized cement by using industrial waste is characterized by comprising the following steps:
s1, crushing, grinding and screening boiler bottom slag, and screening out bottom slag with the particle size of less than 150 microns;
s2, drying the screened bottom slag for a period of time, and taking the dried bottom slag as a geopolymeric cement basic component, and recording the component A as A;
s3, taking the aluminum alloy anodic oxidation alkali washing waste liquid, and recording the waste liquid as B;
s4, mixing the materials A and B according to a mass ratio of 60-80.
2. The method for producing geopolymerized cement from industrial waste according to claim 1, wherein the mass ratio of the two materials A and B is 75.
3. The method for preparing geopolymerized cement from industrial waste according to claim 1, characterized in that the mass ratio of the two materials A and B is 70.
4. The method for preparing geopolymerized cement from industrial waste according to claim 1, characterized in that the mass ratio of the two materials A and B is 80.
5. The method for preparing geopolymerized cement using industrial waste according to claim 1, wherein the mass ratio of the two materials A and B is 60.
6. The method for preparing geopolymerized cement from industrial waste according to claim 1, characterized in that the mass ratio of the two materials A and B is 65.
7. The method for preparing geopolymerized cement from industrial waste according to claim 1, wherein S4 further comprises modified silica which is embedded in silica by aluminum salt.
8. The method for preparing geopolymerized cement using industrial waste according to claim 7, wherein the modified silica is prepared by: 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 dropwise addition is finished, the solution is adjusted to be neutral, and is subjected to heat preservation and curing for a period of time, filtration, washing, drying at the temperature of 110-120 ℃, and grinding to obtain the modified silicon dioxide.
9. The method for preparing geopolymerized cement using industrial waste according to claim 1, wherein the screening in S1 is: screening is carried out under 100-150 meshes.
10. The method for preparing cohesive cement using industrial waste according to claim 1, wherein the drying at 80-150 ℃ for 24-48 hours in S2.
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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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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 |
Non-Patent Citations (1)
| Title |
|---|
| 房永广等: "《赤泥资源化利用理论及技术》", vol. 1, 中国建材工业出版社, pages: 101 - 102 * |
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