CN116986829A - Semi-dry desulfurization ash-fly ash-slag composite cementing material and preparation method thereof - Google Patents
Semi-dry desulfurization ash-fly ash-slag composite cementing material and preparation method thereof Download PDFInfo
- Publication number
- CN116986829A CN116986829A CN202310698914.9A CN202310698914A CN116986829A CN 116986829 A CN116986829 A CN 116986829A CN 202310698914 A CN202310698914 A CN 202310698914A CN 116986829 A CN116986829 A CN 116986829A
- Authority
- CN
- China
- Prior art keywords
- ash
- semi
- fly ash
- slag
- dry desulfurization
- 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
Links
- 239000000463 material Substances 0.000 title claims abstract description 53
- 239000002893 slag Substances 0.000 title claims abstract description 39
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 33
- 230000023556 desulfurization Effects 0.000 title claims abstract description 33
- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002351 wastewater Substances 0.000 claims abstract description 43
- 239000010881 fly ash Substances 0.000 claims abstract description 31
- 239000002956 ash Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000007873 sieving Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 16
- 239000012190 activator Substances 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 235000019353 potassium silicate Nutrition 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 239000003755 preservative agent Substances 0.000 claims description 4
- 230000002335 preservative effect Effects 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 36
- 238000002386 leaching Methods 0.000 abstract description 28
- 230000001988 toxicity Effects 0.000 abstract description 7
- 231100000419 toxicity Toxicity 0.000 abstract description 7
- 239000004567 concrete Substances 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 25
- 230000000694 effects Effects 0.000 description 17
- 238000006703 hydration reaction Methods 0.000 description 9
- 239000000047 product Substances 0.000 description 8
- 238000004088 simulation Methods 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 230000036571 hydration Effects 0.000 description 7
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 229910052793 cadmium Inorganic materials 0.000 description 5
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 239000011206 ternary composite Substances 0.000 description 4
- 229910002056 binary alloy Inorganic materials 0.000 description 3
- 239000012153 distilled water Substances 0.000 description 3
- 239000002920 hazardous waste Substances 0.000 description 3
- 239000010842 industrial wastewater Substances 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002699 waste material Substances 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a semi-dry desulfurization ash-fly ash-slag composite cementing material and a preparation method thereof. The invention comprises the following raw materials: fly ash + slag: 50% of semi-dry desulfurization ash: 3 to 9 percent, 5 to 20 percent of alkali-activated agent and 20.1 to 29.5 percent of wastewater, wherein the mass ratio of the fly ash to the slag is 0.4 to 2.3:1. the preparation method comprises the steps of sieving the semi-dry desulfurization ash, slag and fly ash according to the mass percentages, uniformly mixing, adding a certain amount of wastewater, adding the prepared excitant solution, uniformly stirring, pouring into a mould, vibrating, standing, demoulding and curing. The semi-dry desulfurization ash-fly ash-slag composite cementing material can effectively solidify heavy metal Pb in wastewater simultaneously 2+ 、Cd 2+ No extra energy consumption substances are needed, the concrete national standard is met, the heavy metal leaching toxicity is low, and the environmental safety is high.
Description
Technical Field
The invention relates to the technical field of inorganic cementing materials, in particular to a semi-dry desulfurization ash-fly ash-slag composite cementing material and a preparation method thereof.
Background
Industrial wastewater refers to wastewater discharged in the production process of industrial enterprises, and the wastewater contains waste in the production process, lost pollutants such as raw materials, intermediate products, final products, byproducts and the like, and is a main pollution source for causing water environment pollution. Along with the continuous development of industrial production such as chemistry, smelting, electroplating and the like, the dosage of cadmium, lead and compounds thereof is also increased, and the discharge of the polluted wastewater containing cadmium and lead is also more serious, so that the polluted wastewater becomes one of industrial wastewater with great hazard in the world. The traditional lead and cadmium containing wastewater treatment method mainly comprises a chemical precipitation method, an ion exchange method, an electrolytic method, a reverse osmosis method, an electrodialysis method, an active carbon adsorption method, a biological adsorption method and the like, wherein the heavy metal removal rate of most methods is only about 90 percent. And most of the methods in the prior art use energy materials to remove heavy metals in wastewater.
Disclosure of Invention
The invention aims at providing a semi-dry desulfurization ash-fly ash-slag composite cementing material and a preparation method thereof, aiming at the defects of the prior art.
The invention relates to a semi-dry desulfurization ash-fly ash-slag composite cementing material, which comprises the following raw materials in percentage by mass: fly ash + slag: 50% of semi-dry desulfurization ash: 3 to 9 percent, 5 to 20 percent of alkali excitant and 20.1 to 29.5 percent of wastewater; wherein the mass ratio of the fly ash to the slag is 0.4-2.3: 1.
further, the alkali-activator is NaOH and sodium water glass Na 2 O·nSiO 2 。
Further, the modulus of the alkali-activated agent is 0.5-2.0.
The preparation method of the semi-dry desulfurization ash-fly ash-slag composite cementing material comprises the steps of sieving the semi-dry desulfurization ash, the slag and the fly ash according to the mass percentage, uniformly mixing, adding a certain amount of wastewater, adding the prepared excitant, uniformly stirring, pouring into a mould, vibrating, standing, demoulding and curing to obtain the semi-dry desulfurization ash-fly ash-slag composite cementing material.
Further, the semi-dry desulfurization ash, slag and fly ash are sieved by a 120-mesh sieve.
Further, the alkali-activator is NaOH and sodium water glass Na 2 O·nSiO 2 The method comprises the steps of carrying out a first treatment on the surface of the The preparation process of the alkali-activator solution comprises the following steps: weighing sodium hydroxide in a beaker, adding a proper amount of distilled water, stirring for dissolution, cooling, adding water glass, stirring and standing to obtain an alkali-activated agent solution.
Further, covering a preservative film and standing for 24 hours.
The semi-dry desulfurization ash-fly ash-slag composite cementing material disclosed by the invention takes solid waste as a main raw material, and does not need extra energy consumption substances to treat wastewater, so that the cementing material meeting the national standard of concrete is obtained; when the Fly Ash (FA) and the slag (Sg) are added simultaneously, the activity of the slag is stimulated first, and the released heat can excite the fly ash more quickly, so that the pozzolanic effect of the fly ash is improved. In addition, semi-dry desulfurization ash (FGD) contains a large amount of SO 3 The method has the advantages that the method has an excitation effect on the pozzolan effect of the fly ash, the fly ash is subjected to hydration reaction under the sulfate activity excitation effect of the desulfurization ash, and the generated needle-shaped crystal ettringite is crossed with other hydration products and is filled with the other hydration products, so that the compressive strength of the cementing material can be increased, the strength accords with the national standard of concrete in different ages, the heavy metal leaching toxicity is lower, and the heavy metal Pb is realized 2+ 、Cd 2+ Is effective in curing.
Drawings
FIG. 1 is a flow chart of the preparation and testing of the semi-dry desulfurization ash-fly ash-slag composite cementing material of the present invention.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention are further described, but the present invention is not limited to these examples.
1. Embodiments are described below:
3.1.1 technical proposal (taking the cementing material of the invention as an example)
(1) And (3) preparing a cementing material:
adding 3% Pb into distilled water 2+ 、Cd 2+ Simulating heavy metal-containing wastewater by adding nitrate, adopting orthogonal experiment, selecting five factors including water-gel ratio, exciting agent modulus, exciting agent content, fly ash-slag ratio and desulfurized ash content, setting four levels for each factor, performing 16 groups of orthogonal experiments, wherein the factor levels are shown in Table 1, preparing 20cm multiplied by 20cm samples according to the flow of FIG. 1, curing for 7 and 28 days respectively, and curing according to heavy metal Pb 2+ 、Cd 2+ Leaching concentration, selecting the optimal experimental proportion.
TABLE 1 level of orthogonal experimental factors
(2) Heavy metal solidification experiment
According to tables 2 and 3, simulated wastewater containing heavy metals Cd (II) and Pb (II) with different contents is prepared, and cementing materials are prepared according to an optimal formula respectively.
Table 2 simulation of Cd content settings in wastewater
| Cd-0 | Cd-1 | Cd-2 | Cd-3 | Cd-4 | Cd-5 |
| 0％ | 0.5％ | 1％ | 2％ | 3％ | 4％ |
TABLE 3 simulation of Pb content settings in wastewater
| Pb-0 | Pb-1 | Pb-2 | Pb-3 | Pb-4 | Pb-5 |
| 0％ | 0.5％ | 1％ | 2％ | 3％ | 4％ |
Wherein:
the Cd curing experiment started at a time of 2021.11.23 A.M. of 11:15 and the Pb curing experiment started at a time of 2021.11.25 A.M. of 10.25; each group was freeze-dried and cured for 7 and 28 days, and performance tests were performed at different times, respectively.
(3) Performance test:
A. solidification Property-heavy metal Leaching test
The block sample after 7 days and 28 days of curing and freeze drying is crushed, then the sample is sieved by a 7-mesh sieve and a 16-mesh sieve (1.19 mm-2.80 mm), 10g of sample particles after sieving are put into a 250mL conical flask, and 100mL of secondary water (solid-liquid ratio 1:10) is added. Sealing the bottle mouth of the conical flask by using a preservative film. The conical flask is fixed in a digital display water bath constant temperature oscillator for 8 hours of oscillation, the oscillation frequency is 120r/min, and the flask is kept stand for 16 hours after the oscillation is finished. The leachate was filtered through a microporous membrane (0.45 μm). The resulting leachate was diluted 2-fold with 2% hno3 and then tested for concentration of heavy metal ions in the leachate using ICP. Neutral environment leaching tests were performed according to HJ 557-2010.
B. Mechanical Property-compressive Strength test
And (3) placing the prepared gel material slurry in a triple metal test mould with the thickness of 20mm multiplied by 20mm to prepare a test block, standing for 1d, removing the film number, sealing and placing the test block sample in a standard curing chamber with the relative humidity of more than 90 percent and the temperature of (20+/-2) DEG C, continuously curing to 3, 7, 14 and 28d, respectively testing the unconfined compressive strength, and executing the steps according to the test procedure of the stable material test procedure of inorganic binders for highway engineering (JTGE 51-2009).
3.1.2 formula of cementing material
Cement a (cement of the invention):
water-to-gel ratio: 0.46; alkali-activator modulus: 0.5; water glass: 20.95g; naOH:9.82g; FA:31.80g; sg:74.8g; FGD:10g; simulating waste water: 50.98g;
cementing material B:
alkali-activator modulus: 0.5; water glass: 20.95g; naOH:9.82g; sg:91.6g; FGD:13.2g; simulating waste water: 65.34g;
cementing material C:
alkali-activator modulus: 0.5; water glass: 20.95g; naOH:9.82g; FA:56.8g; FGD:18.97g; simulating waste water: 95.8g;
cementing material D:
alkali-activator modulus: 0.5; water glass: 20.95g; naOH:9.82g; FA:34.4g; sg:79.3g; simulating waste water: 56.5g;
cementing material E:
rice hull ash: 18.4g; CFB desulfurization ash: 113g; slag powder: 55.5g; exciting agent: 25.4g; simulating waste water: 100g;
cementing material F:
slag: 167g; desulfurization ash: 28.6g; limestone: 4.4g; an activity excitant: 4.85g; simulating waste water: 100g.
The cementing material A is a ternary system composite material; the cementing materials B, C, D are binary system composite materials with one raw material reduced on the basis of A; cement E, F is a common other type of composite.
The invention provides a ternary composite cementing material for curing heavy metals Pb (II) and Cd (II) in industrial wastewater, which has lower leaching rate of heavy metals than the existing research after curing for a corresponding age, and has compressive strength meeting the national standard.
3.1.3 preparation flow of cementing Material
Weighing sodium hydroxide in a beaker, adding a proper amount of distilled water, stirring for dissolution, cooling, adding sodium silicate, stirring and standing, sieving with a 120-mesh sieve for semi-dry desulfurization ash, slag, fly ash and the like, stirring uniformly, adding a certain amount of wastewater, and weighing an exciting agent (NaOH+Na) 2 O.nSiO 2 ) Pouring into the mixture, stirring for 5 minutes, pouring into a mould, vibrating, covering with a preservative film, waiting for 24 hours, demoulding, and placing into a standard curing box for curing.
3.2 effects after implementation
3.2.1, examples and comparative examples
TABLE 4Pb Leaching test (Unit: μg/l)
TABLE 5Cd Leaching test (Unit: μg/l)
As shown in tables 4 and 5, pb of group 9 2+ 、Cd 2+ The leaching toxicity of the heavy metals 7d and 28d is the lowest, and the leaching amount is far lower than the limit value (Pb) specified in national standard GB5085.3-2001 hazardous waste identification Standard-leaching toxicity identification<5mg/L、Cd<1 mg/L), comprehensively considering the economic cost and the plasticity problem of the cementing material, selecting the 9 th formula as the preparation condition of the cementing material, and carrying out subsequent experiments such as heavy metal solidification performance comparison, compressive strength test and the like.
3.2.2 Performance test
A. Solidification Property-heavy metal Leaching test
TABLE 6 simulated wastewater 7d Leaching test with Cd-containing heavy metals (Unit: μg/l)
TABLE 7 simulated wastewater 7d Leaching test with Pb-containing heavy metals (Unit: μg/l)
Table 8 simulated wastewater 28d leaching test (Unit: μg/l) with Cd-containing heavy metal
TABLE 9 simulated wastewater 28d Leaching test with Pb-containing heavy metals (Unit: μg/l)
As shown in tables 6 to 9, as the heavy metal content in the simulated wastewater increases, the leaching concentration increases. Under neutral conditions (ph=7), in the cement according to the invention: adding 4% Pb 2+ Pb in 7 days and 28 days 2+ The cure rate of (2) was 99.75% and 99.95%, respectively; adding 4% Cd 2+ Cd 7 days and 28 days 2+ The solidification rate of the resin is 99.99 percent and 99.99 percent respectively, and the leaching amount is far lower than the limit value (Pb) specified in national standard GB5085.3-2001 hazardous waste identification standard-leaching toxicity identification<5mg/L、Cd<1 mg/L), the lead and cadmium cementing materials doped with 4% have no leaching toxicity, and meanwhile, the leaching amount of heavy metals is higher in 7 days, but the leaching amount is reduced to 28 days along with the increase of curing time, which indicates Pb 2+ And Cd 2+ Is cured inside the cement during curing. The group A, B, C, D shows that the ternary system (fly ash, slag and semi-dry desulfurization ash) provided by the invention has good effect of solidifying heavy metals in wastewater, and the solidification effect is better than that of a binary system; as can be seen from the comparison of group A, E, F, the cementing material of the invention cures heavy metal Cd 2+ 、Pb 2+ The effect of the adhesive is superior to other common cementing materials.
B. Mechanical Property-compressive Strength test
Table 10 compression resistance comparison
Table 11 simulation of the compressive strength test of Pb-containing heavy metal added wastewater (unit: mpa)
Table 12 simulation of 3d compressive strength test (unit: mpa) of wastewater containing Cd heavy metal
Table 13 simulation of the compressive Strength test of Pb-containing heavy Metal added wastewater 7d (Unit: mpa)
Table 14 simulation of compressive strength test of wastewater 7d containing Cd heavy metal (unit: mpa)
Table 15 simulation of compressive Strength test of Pb-containing heavy Metal added wastewater 14d (Unit: mpa)
Table 16 compressive strength test (Unit: mpa) of simulated wastewater containing Cd heavy metal 14d
Table 17 simulation of the compressive strength test of Pb-containing heavy metal added wastewater 28d (unit: mpa)
Table 18 test of compressive strength of simulated wastewater 28d containing Cd heavy metal (unit: mpa)
As shown in table 10, group a is the optimal formulation (ternary composite system) for the cement of the present invention; group B, C, D is the compressive strength of the cementing material prepared by canceling one raw material, performing an orthogonal experiment and obtaining the optimal formula; group E, F is other types of cement compressive strength. A. E, F the comparison shows that the cementing material has excellent mechanical properties and is obviously superior to other cementing materials; A. b, C, D comparison shows that the ternary composite system of the fly ash, slag and semi-dry desulfurization ash has good synergistic effect, and the compressive strength is superior to that of a binary system, and the principle is as follows: when the fly ash and the slag are added simultaneously, the activity of the slag is stimulated first, and the released heat can more rapidly stimulate the fly ash, so that the pozzolanic effect of the fly ash is improved. In addition, the desulfurized fly ash contains a large amount of SO 3 The method has the advantages that the method has an excitation effect on the pozzolan effect of the fly ash, the fly ash is subjected to hydration reaction under the sulfate activity excitation effect of the desulfurization ash, and the generated needle-shaped crystal ettringite is crossed with other hydration products and is filled with the other hydration products, so that the compressive strength of the cementing material can be increased, and the strength meets the national standards of concrete in different ages.
As can be seen from tables 11 to 18, the ternary composite cementing material A of the present invention was prepared using a cementing material containing Cd 2+ 、Pb 2+ After the heavy metal simulates the wastewater, the compressive strength of the wastewater exceeds B, C, D, E, F groups of cementing materials no matter in the early stage (3 d) or the later stage (28 d), because the ternary system (fly ash, slag and desulfurized ash) has good synergistic effect, dense cementing grids can be generated to wrap heavy metal ions, and good fixation can be achieved in a short timeThe gel material hydration products are crossed and filled together, so that the compressive strength can be increased, the gel material hydration products conform to the C30 standard (30 MPa is less than or equal to fcu) of GB50010-2010 concrete structural design Specification, and the gel material hydration products can be applied to multiple occasions.
3.3 examples of the invention
3.3.1 example of wastewater treatment
TABLE 19 certain wastewater Components
After uniformly stirring the wastewater and the raw materials of the cementing material, adding an alkali-exciting agent, uniformly mixing, demolding to prepare the cementing material, and respectively detecting the heavy metal leaching concentration of the cementing material after curing to 7d and 28d, wherein the detection result is as follows: cd at age 7d 2+ The leaching concentration is 122 mug/L, and the Pb < 2+ > leaching concentration is 436 mug/L; cd at 28d age 2+ The leaching concentration is 65 mug/L, the leaching concentration of Pb < 2+ > is 141 mug/L, which are far lower than the limit value (Pb) specified in national standard GB5085.3-2001 hazardous waste identification Standard-leaching toxicity identification<5mg/L、Cd<1mg/L)。
3.3.2 roadbed examples
After the wastewater and raw materials (semi-dry desulfurization ash, slag and fly ash) are stirred uniformly, an alkali-activated agent is added and mixed uniformly to prepare a cementing material, and compressive strength detection is carried out at the ages of 7d and 28d respectively, so that the strength of the cementing material meets the C30 standard (30 MPa is less than or equal to fcu) of GB50010-2010 concrete structural design Specification.
The above is not relevant and is applicable to the prior art.
While certain specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the foregoing examples are provided for the purpose of illustration only and are not intended to limit the scope of the invention, and that various modifications or additions and substitutions to the described specific embodiments may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the invention as defined in the accompanying claims. It should be understood by those skilled in the art that any modification, equivalent substitution, improvement, etc. made to the above embodiments according to the technical substance of the present invention should be included in the scope of protection of the present invention.
Claims (7)
1. A semi-dry desulfurization ash-fly ash-slag composite cementing material is characterized in that: comprises the following raw materials in percentage by mass: fly ash + slag: 50% of semi-dry desulfurization ash: 3 to 9 percent, 5 to 20 percent of alkali excitant and 20.1 to 29.5 percent of wastewater; wherein the mass ratio of the fly ash to the slag is 0.4-2.3: 1.
2. the semi-dry desulfurization ash-fly ash-slag composite cement according to claim 1, wherein: the alkali activator is NaOH and sodium silicate Na 2 O·nSiO 2 。
3. The semi-dry desulfurization ash-fly ash-slag composite cement according to claim 2, wherein: the modulus of the alkali-activated agent is 0.5-2.0.
4. A method for preparing a semi-dry desulfurization ash-fly ash-slag composite cementing material according to any one of claims 1 to 3, wherein: sieving the semi-dry desulfurization ash, slag and fly ash according to the mass percentage, uniformly mixing, adding the wastewater and alkali-activator, uniformly stirring, pouring into a mould, vibrating, standing, demoulding and curing to obtain the semi-dry desulfurization ash-fly ash-slag composite cementing material.
5. The method of manufacturing according to claim 4, wherein: the semi-dry desulfurization ash, slag and fly ash are sieved by a 120-mesh sieve.
6. The method of manufacturing according to claim 4, wherein: the alkali activator is NaOH and sodium silicate Na 2 O·nSiO 2 The method comprises the steps of carrying out a first treatment on the surface of the The preparation process of the alkali-activator solution comprises the following steps: weighing sodium hydroxide in beaker, adding appropriate amountDistilled water is stirred and dissolved, water glass is added after cooling, and the mixture is stirred and stood to obtain alkali-activated agent solution.
7. The method of manufacturing according to claim 4, wherein: covering with preservative film, and standing for 24 hr.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310698914.9A CN116986829A (en) | 2023-06-13 | 2023-06-13 | Semi-dry desulfurization ash-fly ash-slag composite cementing material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310698914.9A CN116986829A (en) | 2023-06-13 | 2023-06-13 | Semi-dry desulfurization ash-fly ash-slag composite cementing material and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116986829A true CN116986829A (en) | 2023-11-03 |
Family
ID=88525575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310698914.9A Pending CN116986829A (en) | 2023-06-13 | 2023-06-13 | Semi-dry desulfurization ash-fly ash-slag composite cementing material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116986829A (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101670264A (en) * | 2009-10-29 | 2010-03-17 | 福州大学 | Desulfurized ash slag waste water dephosphorization materials prepared by baking-free method and preparation method |
| CN101670265A (en) * | 2009-10-29 | 2010-03-17 | 福州大学 | Recyclable wastewater delead materials prepared by desulfurized ash slag and preparation method |
| CN101717218A (en) * | 2009-12-02 | 2010-06-02 | 江苏大峘集团有限公司 | Composite blend of semi-dry desulphurization ash and slag and preparation method thereof |
| CN106180134A (en) * | 2016-07-08 | 2016-12-07 | 重庆百世星程环境科技有限公司 | The curing of the produced chromium residue of electroplating wastewater technique |
| CN106220013A (en) * | 2016-08-05 | 2016-12-14 | 武汉理工大学 | A kind of Desulphurization flyash complex mineral blending material and preparation method thereof |
| CN107311488A (en) * | 2017-08-10 | 2017-11-03 | 河北德谦环保科技股份有限公司 | The hydraulic cementing materials being excited into is closed by raw material of a variety of Industrial Solid Wastes |
| CN109354445A (en) * | 2018-10-12 | 2019-02-19 | 天津大学 | A kind of preparation method of non-sintered lytag |
| CN112125543A (en) * | 2020-09-16 | 2020-12-25 | 张延年 | Composite gel material prepared from bulk solid wastes and preparation method thereof |
| CN113121133A (en) * | 2019-12-31 | 2021-07-16 | 可徕卡（上海）环境科技有限公司 | Integrated process for preparing cementing material by flue gas desulfurization and denitrification in synergy |
| CN113117490A (en) * | 2019-12-31 | 2021-07-16 | 中晶新材料有限公司 | Integrated process for flue gas desulfurization and denitrification and cementing material production |
| CN113117494A (en) * | 2019-12-31 | 2021-07-16 | 中晶新材料有限公司 | Integrated method for flue gas desulfurization and denitrification and cementing material production |
| CN113117483A (en) * | 2019-12-30 | 2021-07-16 | 中晶新材料有限公司 | Integrated method for dry desulfurization and denitrification and cementing material manufacturing |
| CN113603435A (en) * | 2021-08-09 | 2021-11-05 | 安徽理工大学 | Alkali-activated concrete prepared from non-ferrous metal beneficiation wastewater |
| CN113797884A (en) * | 2021-09-30 | 2021-12-17 | 东北大学 | Steel slag/fly ash composite waste slag porous adsorption material, preparation method and application |
| CN115819024A (en) * | 2022-12-15 | 2023-03-21 | 华勘(天津)生态城市研究院有限责任公司 | Baking-free brick and preparation method thereof |
-
2023
- 2023-06-13 CN CN202310698914.9A patent/CN116986829A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101670264A (en) * | 2009-10-29 | 2010-03-17 | 福州大学 | Desulfurized ash slag waste water dephosphorization materials prepared by baking-free method and preparation method |
| CN101670265A (en) * | 2009-10-29 | 2010-03-17 | 福州大学 | Recyclable wastewater delead materials prepared by desulfurized ash slag and preparation method |
| CN101717218A (en) * | 2009-12-02 | 2010-06-02 | 江苏大峘集团有限公司 | Composite blend of semi-dry desulphurization ash and slag and preparation method thereof |
| CN106180134A (en) * | 2016-07-08 | 2016-12-07 | 重庆百世星程环境科技有限公司 | The curing of the produced chromium residue of electroplating wastewater technique |
| CN106220013A (en) * | 2016-08-05 | 2016-12-14 | 武汉理工大学 | A kind of Desulphurization flyash complex mineral blending material and preparation method thereof |
| CN107311488A (en) * | 2017-08-10 | 2017-11-03 | 河北德谦环保科技股份有限公司 | The hydraulic cementing materials being excited into is closed by raw material of a variety of Industrial Solid Wastes |
| CN109354445A (en) * | 2018-10-12 | 2019-02-19 | 天津大学 | A kind of preparation method of non-sintered lytag |
| CN113117483A (en) * | 2019-12-30 | 2021-07-16 | 中晶新材料有限公司 | Integrated method for dry desulfurization and denitrification and cementing material manufacturing |
| CN113121133A (en) * | 2019-12-31 | 2021-07-16 | 可徕卡（上海）环境科技有限公司 | Integrated process for preparing cementing material by flue gas desulfurization and denitrification in synergy |
| CN113117490A (en) * | 2019-12-31 | 2021-07-16 | 中晶新材料有限公司 | Integrated process for flue gas desulfurization and denitrification and cementing material production |
| CN113117494A (en) * | 2019-12-31 | 2021-07-16 | 中晶新材料有限公司 | Integrated method for flue gas desulfurization and denitrification and cementing material production |
| CN112125543A (en) * | 2020-09-16 | 2020-12-25 | 张延年 | Composite gel material prepared from bulk solid wastes and preparation method thereof |
| CN113603435A (en) * | 2021-08-09 | 2021-11-05 | 安徽理工大学 | Alkali-activated concrete prepared from non-ferrous metal beneficiation wastewater |
| CN113797884A (en) * | 2021-09-30 | 2021-12-17 | 东北大学 | Steel slag/fly ash composite waste slag porous adsorption material, preparation method and application |
| CN115819024A (en) * | 2022-12-15 | 2023-03-21 | 华勘(天津)生态城市研究院有限责任公司 | Baking-free brick and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 中国环境科学学会编: "《中国环境科学学会学术年会论文集 2011 第2卷》", 30 November 2011, 中国环境科学出版社, pages: 1429 - 1430 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Waste solidification/stabilization of lead–zinc slag by utilizing fly ash based geopolymers | |
| CN101215137A (en) | Ferromanganese ore slag concrete blending material and producing method thereof | |
| CN113929398A (en) | Recycled concrete and preparation method thereof | |
| CN111704423A (en) | Green concrete with high chloride ion curing capability | |
| EP0853602B1 (en) | Hazardous waste treatment | |
| CN111875325A (en) | Curing agent for kaolin polluted by copper ions and sample preparation method | |
| CN111040769B (en) | Soil restoration improving agent and soil restoration improving method | |
| CN109111927A (en) | A kind of heavy metal pollution sandy soil curing agent and its application method | |
| JPH05238790A (en) | Cement extender and production thereof | |
| CN116986829A (en) | Semi-dry desulfurization ash-fly ash-slag composite cementing material and preparation method thereof | |
| CN102826796A (en) | Brick prepared from composition containing sludge and building waste and preparation method thereof | |
| JP3154786B2 (en) | Method for producing artificial aggregate for concrete and artificial aggregate for concrete | |
| KR101096012B1 (en) | Natural friendly-concrete block with function of purificating water using composition of firm-agent and recyclable materials | |
| CN113387669B (en) | Red mud-phosphogypsum-based heavy metal curing agent, and preparation method and application thereof | |
| CN114804683A (en) | For Pb 2+ Novel APG curing agent for pollution treatment and preparation method thereof | |
| CN115785963A (en) | Remediation agent and remediation method for heavy metal contaminated soil | |
| CN113402244A (en) | Setting and curing material, hardened body containing same and preparation method thereof | |
| CN113336502A (en) | Geopolymer curing material for multi-metal contaminated soil and preparation method thereof | |
| CN110615586A (en) | Method for promoting arsenic-containing gypsum slag sludge solidification by using iron-manganese oxide | |
| Hao et al. | Recycling of solar panel waste glass as a partial replacement of meta-kaolinite in the production of geopolymers | |
| CN115572128B (en) | Concrete containing waste incineration fly ash and preparation method thereof | |
| CN108098989A (en) | A kind of method that cupro-nickel contaminated soil cures disposal of resources | |
| CN115504712A (en) | Geopolymer material solidified with heavy metal ions and preparation method thereof | |
| CN116199525A (en) | CO (carbon monoxide) 2 Preparation method for preparing calcium carbonate binder through activation | |
| Anggarini et al. | V. The Effect of Pb Immobilization on Fly Ash Geopolymer Microstructure and Compressive Strength |
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 |