CN113321435A - Alkali-activated fluidized bed fly ash geopolymer and preparation method thereof - Google Patents

Alkali-activated fluidized bed fly ash geopolymer and preparation method thereof Download PDF

Info

Publication number
CN113321435A
CN113321435A CN202110423484.0A CN202110423484A CN113321435A CN 113321435 A CN113321435 A CN 113321435A CN 202110423484 A CN202110423484 A CN 202110423484A CN 113321435 A CN113321435 A CN 113321435A
Authority
CN
China
Prior art keywords
fly ash
fluidized bed
parts
alkali
bed fly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110423484.0A
Other languages
Chinese (zh)
Inventor
王彦君
王庆平
卢春阳
吴求刚
赵恒�
朱龙涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sinochem Jiangsu Geology And Mineral Resources Design And Research Institute Co ltd
Original Assignee
Sinochem Jiangsu Geology And Mineral Resources Design And Research Institute Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sinochem Jiangsu Geology And Mineral Resources Design And Research Institute Co ltd filed Critical Sinochem Jiangsu Geology And Mineral Resources Design And Research Institute Co ltd
Priority to CN202110423484.0A priority Critical patent/CN113321435A/en
Publication of CN113321435A publication Critical patent/CN113321435A/en
Pending legal-status Critical Current

Links

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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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

Abstract

An alkali-activated fluidized bed fly ash geopolymer comprises the following components in parts by weight: 250-270 parts of fluidized bed fly ash, 30-50 parts of cement, 5-18 parts of inorganic alkali activator, 5-18 parts of organic alkali activator and 120-140 parts of water. According to the invention, the organic alkali activator and the inorganic alkali activator are used for carrying out composite alkali excitation on the fluidized bed fly ash, so that the problem of high utilization difficulty of the fluidized bed fly ash due to complex components and low activity of the fly ash is effectively solved, the high-dosage utilization of the fluidized bed fly ash is realized, and the mechanical property of the prepared fluidized bed fly ash geopolymer is ensured.

Description

Alkali-activated fluidized bed fly ash geopolymer and preparation method thereof
Technical Field
The invention relates to the technical field of cementing materials, in particular to an alkali-activated fluidized bed fly ash geopolymer and a preparation method thereof.
Background
Limestone is known to be harvested in large quantities as a raw material for cement production around the world, which results in an ecological imbalance. Since concrete is the most widely used building material, the pressure of sand and aggregate as natural resources has also increased. The cement manufacturer converts limestone into calcium oxide by heating, the fuel used by the heating cement kiln can be coal, natural gas, sawdust, methane gas and the like, and carbon dioxide is released in the chemical conversion and firing processes, which is also the main component of greenhouse gas. Therefore, it is very important to find alternatives to these resources.
In 1978, professor france Joseph Davidovits reacted kaolin with lye to produce a novel aluminosilicate material having a three-dimensional network structure ranging from amorphous to semi-crystalline, which was a network polymeric gel composed of siloxahedron and alundum tetrahedrons. Joseph Davidovits called geopolymers for this material. The geopolymer raw material is natural mineral, mining waste residue and tailings rich in silicon-aluminum components, and the source of the geopolymer raw material is rich, such as fly ash, slag, potassium feldspar tailings, kaolin and the like. The preparation process of the geopolymer is simple, the energy consumption is low, and the preparation process is only about 60 percent of that of the portland cement. Reacting liquid excitant with mineral containing active silicon-aluminium component, solid waste or their mixture at normal temperature to 100 deg.C, and curing for a short time, wherein only a small amount of CO is used in the preparation process2The discharge is 10 to 20 percent of the Portland cement. The geopolymer has excellent mechanical property, low shrinkage, high temperature resistance, chemical corrosion resistance and low thermal conductivity, and has high ionic conductivity. The geopolymer has wide application, and can be used in the fields of building materials, refractory and heat-insulating materials, metallurgy, toxic metal ion fixation treatment and the like.
The trend to replace cement with alkali activated materials and geopolymers opens new avenues for researchers worldwide to start with the potential waste bottom ash becoming a commercial entity.
The fluidized bed fly ash exists in irregular particles, so that the surface area of the fluidized bed fly ash is smaller than that of the traditional pulverized coal furnace fly ash spherical particles; and the carbon content of the fluidized bed fly ash is higher due to the difference of the calcining temperature. However, compared with pulverized coal furnace fly ash, the fluidized bed fly ash has more complex components, low activity and great utilization difficulty. Therefore, the fluidized bed fly ash with huge reserves and large annual output is difficult to be effectively utilized.
Disclosure of Invention
In order to solve the defect that the fluidized bed fly ash in the prior art is difficult to be effectively utilized due to low activity and the like, the invention provides an alkali-activated fluidized bed fly ash geopolymer and a preparation method thereof.
One of the purposes of the invention adopts the following technical scheme:
an alkali-activated fluidized bed fly ash geopolymer comprises the following components in parts by weight: 250-270 parts of fluidized bed fly ash, 30-50 parts of cement, 5-18 parts of inorganic alkali activator, 5-18 parts of organic alkali activator and 120-140 parts of water.
Preferably, the composition comprises the following components in parts by weight: 250 parts of fluidized bed fly ash, 50 parts of cement, 15 parts of inorganic alkali activator, 15 parts of organic alkali activator and 126 parts of water.
Preferably, the inorganic alkali activator adopts sodium silicate with a modulus of 1.2-2.
Preferably, the inorganic alkali activator is prepared by sodium silicate with an initial modulus of greater than or equal to 2 and sodium hydroxide solution.
Preferably, the organic base activator is sodium acetate.
Preferably, the fluidized bed fly ash is grade III low-calcium fluidized bed fly ash, and the CaO content of the fluidized bed fly ash is 4.02% by mass, the water content of the fluidized bed fly ash is 20.92% by mass, and the burning vector of the fluidized bed fly ash is 11.46% by mass.
The second purpose of the invention adopts the following technical scheme:
a preparation method of an alkali-activated fluidized bed fly ash geopolymer comprises the following steps:
s1, weighing 250-270 parts of fluidized bed fly ash, 30-50 parts of cement, 5-18 parts of inorganic alkali activator, 5-18 parts of organic alkali activator and 120-140 parts of water according to parts by weight;
s2, drying the fluidized bed fly ash and then crushing the dried fluidized bed fly ash to 200 meshes and 250 meshes; then uniformly stirring the pulverized fluidized bed fly ash and cement to obtain a mixture A;
s3, dividing the water into three parts, and dissolving one part of water in the inorganic base activator to form a solution B; dissolving the other part of water in an organic base activator to form a solution C;
s4, mixing the solution B and the solution C to obtain a solution D, adding the solution D into the mixture A and stirring, and adding the last part of water in the stirring process to obtain uniformly stirred slurry; or adding the solution B and the solution C into the mixture A and stirring, and adding the last part of water in the stirring process to obtain uniformly stirred slurry;
s5, pouring the slurry into a mould and leveling to form a sample;
s6, curing the sample in a high-temperature curing box for a set first time, then demolding, and curing in a common curing box for a designed second time to obtain the fluidized bed fly ash geopolymer;
in the steps, the sequence of S2 and S3 is not divided.
Preferably, in step S4, stirring is performed at 1000 to 1200r/min in a neat paste stirrer.
Preferably, in step S5, the slurry is poured into a six-link mold in two layers, the first layer of slurry is filled, the vibration is carried out for 1min, the second layer of slurry is filled, the vibration is carried out for 2min, and the surface of the slurry is smoothed to form a sample.
Preferably, in step S6, the first time period is 2 days, and the second time period is 26 days.
The invention has the advantages that:
(1) according to the invention, the organic alkali activator and the inorganic alkali activator are used for carrying out composite alkali excitation on the fluidized bed fly ash, so that the problem of high utilization difficulty of the fluidized bed fly ash due to complex components and low activity of the fly ash is effectively solved, the high-dosage utilization of the fluidized bed fly ash is realized, and the mechanical property of the prepared fluidized bed fly ash geopolymer is ensured.
(2) In the invention, the organic alkali activator and the inorganic alkali activator are used for carrying out composite alkali excitation, so that the problem of saltpetering caused by inorganic alkali excitation is effectively solved.
(3) In the invention, sodium silicate, namely sodium silicate glass, is added into the fluidized bed fly ash to be used as an inorganic alkali activator, the sodium silicate is a strong alkali weak acid salt, and can be hydrolyzed in water to generate OH-Providing an alkaline environment for geological reaction; SO in sodium silicate3 2-Is an active silicon source and can provide raw materials for geological reactions. When inorganic alkali excitation is carried out on geological reaction by only using sodium silicate, redundant alkali reacts with carbon dioxide in the environment to generate Na2CO3Thereby causing a saltpetering phenomenon. In the invention, sodium acetate as an organic base activator is added into geological reaction, so that the acidity of acetic acid is stronger than that of carbonic acid, so that CH3COO-The presence of (A) inhibits Na2CO3Thereby inhibiting the phenomena of whiskering, and realizing the balance of excellent mechanical property of the fluidized bed fly ash geopolymer and the inhibition of the phenomena of whiskering.
(4) The invention realizes the high-doping utilization of the fluidized bed fly ash, and the prepared fluidized bed fly ash geopolymer cementing material realizes the low emission of carbon dioxide, and meets the characteristics of energy conservation, environmental protection and the like.
(5) The fluidized bed fly ash geopolymer provided by the invention has the advantages of simple process, low price and easy obtainment of raw materials, and the production cost of the address polymer is reduced.
Drawings
FIG. 1 is a flow chart of a method for preparing an alkali-activated fluidized bed fly ash geopolymer;
FIG. 2 is a flow chart of another method for preparing an alkali-activated fluidized bed fly ash geopolymer.
Detailed Description
Name interpretation:
vector burning: the mass of the substance lost after being burned for 20min by a high-temperature furnace; generally refers to the carbon content of the fly ash and other trace substances which can be lost by burning.
The invention is further illustrated with reference to the following specific examples.
In each of the following embodiments, the components for preparing the alkali-activated fluidized bed fly ash geopolymer comprise, in parts by mass: 250-270 parts of fluidized bed fly ash, 30-50 parts of cement, 5-18 parts of inorganic alkali activator, 5-18 parts of organic alkali activator and 120-140 parts of water.
In the following examples, sodium water glass having a modulus of 1.2 to 2 is used as the inorganic alkali activator. Specifically, the sodium silicate with the modulus of 1.2-2 is prepared from sodium silicate with the initial modulus of more than or equal to 2 and a sodium hydroxide solution.
In the following examples, sodium acetate is used as the organic base activator.
In the following examples, the fluidized bed fly ash is a class III low-calcium fluidized bed fly ash, and has a CaO content of 4.02%, a water content of 20.92%, and a burning vector of 11.46% by mass.
In this embodiment, the grade III low-calcium fluidized bed fly ash used has the composition shown in table 1 below.
Table 1: XRF result table for class III low-calcium fluidized bed fly ash
SiO2％ Al2O3％ Fe2O3％ CaO％ MgO％ SO3％ TiO2％ LOI％ H20％
53.02 31.95 3.82 4.02 1.26 0.58 1.32 11.46 20.92
In table 2 above, LOI represents the burning vector.
In the following examples, the preparation of the alkali-activated fluidized bed fly ash geopolymer was as follows:
s1, weighing 250-270 parts of fluidized bed fly ash, 30-50 parts of cement, 5-18 parts of inorganic alkali activator, 5-18 parts of organic alkali activator and 120-140 parts of water according to parts by weight.
S2, drying the fluidized bed fly ash and then crushing the dried fluidized bed fly ash to 200 meshes and 250 meshes; and then uniformly stirring the pulverized fluidized bed fly ash and cement to obtain a mixture A.
S3, dividing the water into three parts, and dissolving one part of water in the inorganic base activator to form a solution B; and dissolving the other part of water in the organic base activator to form a solution C.
S4, mixing the solution B and the solution C to obtain a solution D, adding the solution D into the mixture A and stirring, and adding the last part of water in the stirring process to obtain uniformly stirred slurry; alternatively, solution B and solution C are added to mixture a and stirred, and the last portion of water is added during stirring to obtain a uniformly stirred slurry.
S5, pour the slurry into a mold and trowel to form a coupon.
And S6, curing the sample in a high-temperature curing box for a set first time, then demolding, and curing in a common curing box for a designed second time to obtain the fluidized bed fly ash geopolymer. Specifically, in the step, the high-temperature curing box is an HY-84 type curing box, and the ordinary curing box is an HBY-40B type curing box.
In the steps, the sequence of S2 and S3 is not divided.
Example 1
The preparation steps of the alkali-activated fluidized bed fly ash geopolymer in this example are as follows:
s1, weighing 250 parts of fluidized bed fly ash, 50 parts of cement, 15 parts of inorganic base activator, 15 parts of organic base activator and 126 parts of water according to parts by weight. The inorganic alkali activator adopts sodium water glass Na with a modulus of 1.82O·nSiO2The organic alkali activator adopts sodium acetate NaAc.
S2, drying the fluidized bed fly ash and then crushing the dried fluidized bed fly ash to 200 meshes and 250 meshes; and then uniformly stirring the pulverized fluidized bed fly ash and cement to obtain a mixture A.
S3, dividing the water into three parts, and dissolving one part of water in the inorganic base activator to form a solution B; and dissolving the other part of water in the organic base activator to form a solution C.
And S4, mixing the solution B and the solution C to obtain a solution D, adding the solution D into the mixture A, stirring in a slurry purification stirrer at a speed of 1000-1200 r/min, and adding the last part of water during stirring to obtain uniformly stirred slurry.
And S5, pouring the slurry into a six-connection die in two layers, filling the slurry into the first layer, vibrating for 1min, filling the slurry into the second layer, vibrating for 2min, and smoothing the surface of the slurry to form a sample.
And S6, curing the sample in a high-temperature curing box for 2 days, then demolding, and then curing in a common curing box for 26 days to obtain the fluidized bed fly ash geopolymer.
In the steps, the sequence of S2 and S3 is not divided.
It should be noted that, in step S4 of this embodiment, the solution B and the solution C may also be directly added to the mixture a, and stirred in a slurry mixer at 1000-1200 r/min, and the last part of water is added during stirring, so as to obtain a slurry with uniform stirring. The two solutions B and C are added into the mixture A, and the effect of the fluidized bed fly ash geopolymer finally obtained is the same. The effects include intensity and saltpetering phenomena.
Example 2
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 1, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed in this example relative to example 1.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 18 parts of inorganic alkali activator, 12 parts of organic alkali activator and 132 parts of water. Wherein, the inorganic alkali activator adopts sodium water glass with the modulus of 1.8, and the organic alkali activator adopts NaAc.
Example 3
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 1, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed in this example relative to example 1.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 12 parts of inorganic alkali activator, 18 parts of organic alkali activator and 132 parts of water. Wherein, the inorganic alkali activator adopts sodium water glass with the modulus of 1.8, and the organic alkali activator adopts NaAc.
Example 4
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 1, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed in this example relative to example 1.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 10 parts of inorganic alkali activator, 5 parts of organic alkali activator and 126 parts of water. Wherein, the inorganic alkali activator adopts sodium water glass with the modulus of 1.8, and the organic alkali activator adopts NaAc.
Example 5
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 1, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed in this example relative to example 1.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 5 parts of inorganic alkali activator, 10 parts of organic alkali activator and 126 parts of water. Wherein, the inorganic alkali activator adopts sodium water glass with the modulus of 1.8, and the organic alkali activator adopts NaAc.
Example 6
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 1, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed in this example relative to example 1.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 7.5 parts of inorganic alkali activator, 7.5 parts of organic alkali activator and 126 parts of water. Wherein, the inorganic alkali activator adopts sodium water glass with the modulus of 1.8, and the organic alkali activator adopts NaAc.
Example 7
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 1, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed in this example relative to example 1.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 15 parts of inorganic alkali activator, 15 parts of organic alkali activator and 126 parts of water. Wherein, the inorganic alkali activator adopts sodium water glass with the modulus of 1.2, and the organic alkali activator adopts NaAc.
Example 8
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 1, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed in this example relative to example 1.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 15 parts of inorganic alkali activator, 15 parts of organic alkali activator and 126 parts of water. Wherein, the inorganic alkali activator adopts sodium water glass with the modulus of 2.0, and the organic alkali activator adopts NaAc.
Example 9
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 1, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed in this example relative to example 1.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 260 parts of fluidized bed fly ash, 40 parts of cement, 15 parts of inorganic alkali activator, 15 parts of organic alkali activator and 132 parts of water. Wherein, the inorganic alkali activator adopts sodium water glass with the modulus of 1.8, and the organic alkali activator adopts NaAc.
Example 10
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 1, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed in this example relative to example 1.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 270 parts of fluidized bed fly ash, 30 parts of cement, 15 parts of an inorganic alkali activator, 15 parts of an organic alkali activator and 132 parts of water. Wherein, the inorganic alkali activator adopts sodium water glass with the modulus of 1.8, and the organic alkali activator adopts NaAc.
Example 11
The preparation steps of the alkali-activated fluidized bed fly ash geopolymer in this example are as follows:
s1, weighing 250 parts of fluidized bed fly ash, 50 parts of cement and 120 parts of water according to parts by weight.
S2, drying the fluidized bed fly ash and then crushing the dried fluidized bed fly ash to 200 meshes and 250 meshes; and then uniformly stirring the pulverized fluidized bed fly ash and cement to obtain a mixture A.
S3, adding water into the mixture A, and stirring in a clean slurry stirrer at a speed of 1000-1200 r/min to obtain uniformly stirred slurry.
And S4, pouring the slurry into a six-connection die in two layers, filling the slurry into the first layer, vibrating for 1min, filling the slurry into the second layer, vibrating for 2min, and smoothing the surface of the slurry to form a sample.
And S5, curing the sample in a high-temperature curing box for 2 days, then demolding, and then curing in a common curing box for 26 days to obtain the fluidized bed fly ash geopolymer.
Example 12
The preparation steps of the alkali-activated fluidized bed fly ash geopolymer in this example are as follows:
s1, weighing 250 parts of fluidized bed fly ash, 50 parts of cement, 30 parts of inorganic base activator and 132 parts of water according to parts by weight. The inorganic alkali activator adopts sodium water glass Na with a modulus of 1.82O·nSiO2。
S2, drying the fluidized bed fly ash and then crushing the dried fluidized bed fly ash to 200 meshes and 250 meshes; and then uniformly stirring the pulverized fluidized bed fly ash and cement to obtain a mixture A.
S3, dividing the water into two parts, and dissolving one part of the water in the inorganic base activator to form a solution B.
And S4, adding the solution B into the mixture A, stirring in a clean slurry stirrer at a speed of 1000-1200 r/min, and adding the residual water in the stirring process to obtain uniformly stirred slurry.
And S5, pouring the slurry into a six-connection die in two layers, filling the slurry into the first layer, vibrating for 1min, filling the slurry into the second layer, vibrating for 2min, and smoothing the surface of the slurry to form a sample.
And S6, curing the sample in a high-temperature curing box for 2 days, then demolding, and then curing in a common curing box for 26 days to obtain the fluidized bed fly ash geopolymer.
In the steps, the sequence of S2 and S3 is not divided.
Example 13
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 12, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed from that in example 12.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 15 parts of inorganic alkali activator and 126 parts of water. Wherein, the inorganic alkali excitant adopts sodium water glass with the modulus of 1.8.
Example 14
The preparation steps of the alkali-activated fluidized bed fly ash geopolymer in this example are as follows:
s1, weighing 250 parts of fluidized bed fly ash, 50 parts of cement, 30 parts of organic base activator and 132 parts of water according to parts by weight. The organic alkali activator adopts sodium acetate NaAc.
S2, drying the fluidized bed fly ash and then crushing the dried fluidized bed fly ash to 200 meshes and 250 meshes; and then uniformly stirring the pulverized fluidized bed fly ash and cement to obtain a mixture A.
S3, dividing the water into two parts, and dissolving one part of the water in the organic base activator to form a solution C.
And S4, adding the solution C into the mixture A, stirring in a clean slurry stirrer at a speed of 1000-1200 r/min, and adding the residual water in the stirring process to obtain uniformly stirred slurry.
And S5, pouring the slurry into a six-connection die in two layers, filling the slurry into the first layer, vibrating for 1min, filling the slurry into the second layer, vibrating for 2min, and smoothing the surface of the slurry to form a sample.
And S6, curing the sample in a high-temperature curing box for 2 days, then demolding, and then curing in a common curing box for 26 days to obtain the fluidized bed fly ash geopolymer.
In the steps, the sequence of S2 and S3 is not divided.
Example 15
The procedure for preparing the alkali-activated fluidized bed fly ash geopolymer in this example was the same as in example 14, and only the composition of the alkali-activated fluidized bed fly ash geopolymer was changed from that in example 14.
The alkali-activated fluidized bed fly ash geopolymer in the embodiment comprises the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 15 parts of organic base activator and 126 parts of water. The organic base excitant adopts NaAc.
In the above examples 1 to 6, 9 to 10, and 12 to 13, the inorganic alkali activator is sodium water glass with a modulus of 1.8, that is, the solution B in the above examples is sodium water glass with a modulus of 1.8, and the solution B is specifically prepared from sodium water glass with a modulus of 2 and sodium hydroxide solution.
In the above embodiments 1 to 15, the cement may specifically be portland cement.
Specifically, the preparation method of the solution B in the above embodiment is as follows: with mass mNaDissolving OH NaOH solid powder in water, adding NaOH solution with mass
Figure BDA0003028770060000111
To form a solution B.
Figure BDA0003028770060000112
Figure BDA0003028770060000113
In the formula: m isInorganic substanceFor the required quality of the inorganic base excitant,
Figure BDA0003028770060000114
is Na2Molar mass of O, MNaOHIs the molar mass of the NaOH,
Figure BDA0003028770060000115
is the mass percent of sodium oxide in the initial sodium water glass, MRaw materialsThe modulus of the initial sodium water glass, MFinished productThe modulus of the sodium water glass produced was determined.
Figure BDA0003028770060000116
MNaOH＝40
For example, in example 12, the desired mass m of the inorganic base activatorInorganic substance30g, modulus M of the required sodium silicateFinished product1.8. In example 12, the initial sodium silicate used was sodium silicate nonahydrate with the parameters: modulus 2, by mass percent, silica 53.52%, sodium oxide 26.75%. Thus, MRaw materials＝2，
Figure BDA0003028770060000117
Calculation according to the above formula (1) gives:
Figure BDA0003028770060000121
Figure BDA0003028770060000122
thus, in example 12, the preparation of solution B was: 1.38 g of NaOH are dissolved in water, and 28.62 g of initial sodium water glass solid powder with a modulus of 2 are added to the NaOH solution.
In the alkali-activated fluidized bed fly ash geopolymer in the above examples 1 to 10, the inorganic alkali activator and the organic alkali activator are used for composite alkali activation in the preparation process, and the finally obtained geopolymer has high strength and is not easy to be saltpetering.
The alkali-activated fluidized bed fly ash geopolymer in example 11 above was prepared without alkali activation, and the address polymer did not exhibit saltpetering, but was of lower strength.
In the alkali-activated fluidized bed fly ash geopolymers in the above examples 12 to 13, the inorganic alkali activator is used for alkali activation in the preparation process, and the finally obtained geopolymer has high strength but severe saltpetering.
In the alkali-activated fluidized bed fly ash geopolymers in the above examples 14 to 15, the organic alkali activator is used for alkali activation in the preparation process, and the finally obtained geopolymer has low strength.
Examples 11-15 above are used to provide comparative data to illustrate the effect of the alkali-activated fluidized bed fly ash geopolymer obtained in examples 1-10.
Specifically, in table 2 below, the effect of the geopolymer was compared with the strength and the degree of saltpetering after curing the geopolymer with alkali-activated fluidized bed fly ash for 28 days.
Table 2 below: effect statistics of alkali-activated fluidized bed fly ash geopolymer prepared in examples
Figure BDA0003028770060000123
Figure BDA0003028770060000131
In table 2 above, explanation of the degree of whiskering:
slight: the color of the surface of the concrete becomes lighter;
more serious is that: small-area bulging and peeling of the concrete surface;
severe: the surface of the concrete is peeled and fallen in large area.
Combining the above table 2, it can be seen that in examples 12 and 13, the geopolymer of the fluidized bed fly ash is alkali-excited by the inorganic alkali-exciting agent, and the finally obtained geopolymer has excellent mechanical properties, i.e., strength, but severe saltpetering. Examples 14 and 15 the geopolymer of the fluidized bed fly ash was alkali-excited by an organic alkali activator, and the resulting geopolymer had poor mechanical properties but no whiskering. The geopolymer finally obtained by the method of carrying out composite alkali excitation by the organic alkali exciting agent and the inorganic alkali exciting agent ensures excellent mechanical property and inhibits the phenomenon of saltpetering. The fluidized bed geopolymer obtained by the method can be widely used.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The alkali-activated fluidized bed fly ash geopolymer is characterized by comprising the following components in parts by mass: 250-270 parts of fluidized bed fly ash, 30-50 parts of cement, 5-18 parts of inorganic alkali activator, 5-18 parts of organic alkali activator and 120-140 parts of water.
2. The alkali-activated fluidized bed fly ash geopolymer of claim 1, comprising the following components in parts by mass: 250 parts of fluidized bed fly ash, 50 parts of cement, 15 parts of inorganic alkali activator, 15 parts of organic alkali activator and 126 parts of water.
3. The alkali-activated fluidized bed fly ash geopolymer as claimed in claim 1 or 2, wherein the inorganic alkali activator is sodium water glass with a modulus of 1.2-2.
4. The alkali-activated fluidized bed fly ash geopolymer of claim 3, wherein the inorganic alkali-activator is formulated with sodium water glass having an initial modulus of 2 or greater and a sodium hydroxide solution.
5. The alkali-activated fluidized bed fly ash geopolymer of claim 1, wherein the organic alkali-activator is sodium acetate.
6. The alkali-activated fluidized bed fly ash geopolymer of claim 1, wherein the fluidized bed fly ash is a class III low calcium fluidized bed fly ash having a CaO content of 4.02%, a water content of 20.92%, and a burning vector of 11.46% by mass.
7. The preparation method of the alkali-activated fluidized bed fly ash geopolymer is characterized by comprising the following steps of:
s1, weighing 250-270 parts of fluidized bed fly ash, 30-50 parts of cement, 5-18 parts of inorganic alkali activator, 5-18 parts of organic alkali activator and 120-140 parts of water according to parts by weight;
s2, drying the fluidized bed fly ash and then crushing the dried fluidized bed fly ash to 200 meshes and 250 meshes; then uniformly stirring the pulverized fluidized bed fly ash and cement to obtain a mixture A;
s3, dividing the water into three parts, and dissolving one part of water in the inorganic base activator to form a solution B; dissolving the other part of water in an organic base activator to form a solution C;
s4, mixing the solution B and the solution C to obtain a solution D, adding the solution D into the mixture A and stirring, and adding the last part of water in the stirring process to obtain uniformly stirred slurry; or adding the solution B and the solution C into the mixture A and stirring, and adding the last part of water in the stirring process to obtain uniformly stirred slurry;
s5, pouring the slurry into a mould and leveling to form a sample;
s6, curing the sample in a high-temperature curing box for a set first time, then demolding, and curing in a common curing box for a designed second time to obtain the fluidized bed fly ash geopolymer;
in the steps, the sequence of S2 and S3 is not divided.
8. The method for preparing the alkali-activated fluidized bed fly ash geopolymer as claimed in claim 7, wherein in step S4, stirring is performed in a neat paste stirrer at 1000-1200 r/min.
9. The method for preparing the alkali-activated fluidized bed fly ash geopolymer as claimed in claim 7, wherein in step S5, the slurry is poured into a six-link mould in two layers, the slurry in the first layer is filled and vibrated for 1min, the slurry in the second layer is filled and vibrated for 2min, and the surface of the slurry is smoothed to form the sample.
10. The method of making an alkali-activated fluidized bed fly ash geopolymer of claim 7, wherein in step S6, the first time period is 2 days and the second time period is 26 days.
CN202110423484.0A 2021-04-20 2021-04-20 Alkali-activated fluidized bed fly ash geopolymer and preparation method thereof Pending CN113321435A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110423484.0A CN113321435A (en) 2021-04-20 2021-04-20 Alkali-activated fluidized bed fly ash geopolymer and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110423484.0A CN113321435A (en) 2021-04-20 2021-04-20 Alkali-activated fluidized bed fly ash geopolymer and preparation method thereof

Publications (1)

Publication Number Publication Date
CN113321435A true CN113321435A (en) 2021-08-31

Family

ID=77414890

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110423484.0A Pending CN113321435A (en) 2021-04-20 2021-04-20 Alkali-activated fluidized bed fly ash geopolymer and preparation method thereof

Country Status (1)

Country Link
CN (1) CN113321435A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115368068A (en) * 2022-10-27 2022-11-22 途昇(天津)环保科技有限公司 Preparation method of efflorescence-resistant incineration waste bottom ash geopolymer solid brick and solid brick

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014397A1 (en) * 1979-01-27 1980-08-20 Maruli H. Dr. Simatupang Process for the manufacture of materials
CN103833246A (en) * 2014-01-15 2014-06-04 南京大学 Quick-setting gel material and preparation method thereof
CN104230292A (en) * 2014-09-03 2014-12-24 石河子大学 Basalt fiber reinforced gypsum
CN108395162A (en) * 2018-05-09 2018-08-14 辽宁工程技术大学 A kind of flyash geo-polymer composite gelled material and preparation method thereof
CN112028541A (en) * 2020-09-09 2020-12-04 江西省建筑材料工业科学研究设计院 Concrete nano reinforcing modifier and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014397A1 (en) * 1979-01-27 1980-08-20 Maruli H. Dr. Simatupang Process for the manufacture of materials
CN103833246A (en) * 2014-01-15 2014-06-04 南京大学 Quick-setting gel material and preparation method thereof
CN104230292A (en) * 2014-09-03 2014-12-24 石河子大学 Basalt fiber reinforced gypsum
CN108395162A (en) * 2018-05-09 2018-08-14 辽宁工程技术大学 A kind of flyash geo-polymer composite gelled material and preparation method thereof
CN112028541A (en) * 2020-09-09 2020-12-04 江西省建筑材料工业科学研究设计院 Concrete nano reinforcing modifier and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李泽等: "粉煤灰基地质聚合物固化重金属Pb2+的研究", 《硅酸盐通报》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115368068A (en) * 2022-10-27 2022-11-22 途昇(天津)环保科技有限公司 Preparation method of efflorescence-resistant incineration waste bottom ash geopolymer solid brick and solid brick

Similar Documents

Publication Publication Date Title
US7682448B2 (en) High compressive strength silica mortar and manufacturing method thereof
CN104098281A (en) Geopolymer composition, geopolymer material and preparation method thereof
CN1286766C (en) Steel slag-metakaolin compound gel material and preparation method thereof
CN101792275A (en) Fly ash-based inorganic polymer composite cementitious material and preparation method thereof
CN107265891A (en) One kind is using enhanced geopolymer of rice hull ash and preparation method thereof
CN110467368A (en) A kind of activity excitant and preparation method thereof for inorganic solid waste building materials
CN105693119B (en) A kind of modified phosphorous slag powder and its preparation method and application
Nassar et al. Effective utilization of agricultural waste in synthesizing activator for sustainable geopolymer technology
CN103319103A (en) Regenerative hardened cement mortar gelling material and preparation method thereof
CN115259702A (en) Slag fly ash-based alkali-activated cementing material and preparation method thereof
CN106946537B (en) A kind of titanium gypsum high performance concrete building materials and preparation method thereof
Detphan et al. Strength development and thermal conductivity of POFA lightweight geopolymer concrete incorporating FA and PC.
CN108218269A (en) A kind of ferronickel refuse lac gel material and its preparation process
CN113321435A (en) Alkali-activated fluidized bed fly ash geopolymer and preparation method thereof
Jaradat et al. Effects of micro silica on the compressive strength and absorption characteristics of olive biomass ash-based geopolymer
CN108947427A (en) A kind of facing mortar and its preparation and application
Chen et al. Fabrication of one-part geopolymer from coal gasification slag via alkali fusion and component additive method: Effect of different alkali-to-slag ratios
CN102936121A (en) Composite material used in mine roadway filling
CN107663044A (en) A kind of geopolymer class weak soil cementing agent and preparation method thereof
CN109020397A (en) A kind of phase-change energy-storage mortar and preparation method thereof
CN113443879B (en) Lightweight aggregate concrete produced by utilizing recycled lightweight aggregate and production process thereof
CN115259726A (en) Composite excitant for cementing material and preparation method thereof
CN108358549A (en) A kind of high-performance insulating brick for building and preparation method thereof
CN108530015A (en) A kind of steamed brick and preparation method thereof using bauxite gangue manufacture
CN113773001A (en) Geopolymer material containing iron ore tailings powder and granite stone powder and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination