CN116102272A - Green gel material capable of realizing carbon reduction and carbon fixation and preparation method thereof - Google Patents
Green gel material capable of realizing carbon reduction and carbon fixation and preparation method thereof Download PDFInfo
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- CN116102272A CN116102272A CN202310018447.0A CN202310018447A CN116102272A CN 116102272 A CN116102272 A CN 116102272A CN 202310018447 A CN202310018447 A CN 202310018447A CN 116102272 A CN116102272 A CN 116102272A
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- 239000000463 material Substances 0.000 title claims abstract description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 86
- 239000004568 cement Substances 0.000 claims abstract description 52
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 50
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 45
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 44
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 43
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 43
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 230000000694 effects Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 10
- 239000002440 industrial waste Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 32
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 241000537371 Fraxinus caroliniana Species 0.000 claims description 2
- 235000010891 Ptelea trifoliata Nutrition 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 42
- 239000001569 carbon dioxide Substances 0.000 abstract description 21
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 21
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 19
- 239000000047 product Substances 0.000 description 17
- 239000011148 porous material Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 239000012467 final product Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- -1 carbonic acid compound Chemical class 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 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
- C04B9/00—Magnesium cements or similar cements
- C04B9/20—Manufacture, e.g. preparing the batches
-
- 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
- C04B9/00—Magnesium cements or similar cements
- C04B9/06—Cements containing metal compounds other than magnesium compounds, e.g. compounds of zinc or lead
Abstract
The invention provides a preparation method of a green gel material capable of realizing carbon reduction and carbon fixation, which comprises the following steps: first, CO is continuously introduced 2 Under the condition of (1), sodium hydroxide reacts with water to obtain sodium bicarbonate; secondly, magnesium oxide and sodium bicarbonate are mixed according to the molar mass ratio of (2-4): 1, mixing to obtain a dry mixed material; and finally, adding water into the dry mixed material according to the water-cement mass ratio of 0.5-0.55, uniformly mixing to obtain the mixed material, pouring, oscillating and curing the mixed material to a specified age. On one hand, compared with cement, the green gel material prepared by the invention can reduce the generation of carbon dioxide in the preparation and curing processes, and has higher compressive strength than cement under the same condition; on the other hand, the sodium bicarbonate is obtained by adding water into sodium hydroxide to absorb carbon dioxide in industrial waste gas for reaction, and is used as a carrier of the carbon dioxide in practical engineering, thereby achieving the recycling of the carbon dioxideThe effect of 'carbon reduction and carbon fixation' is realized, and the method has popularization and application values.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a green gelling material capable of realizing carbon reduction and carbon fixation and a preparation method thereof.
Background
Cement is a raw material used in a large amount in construction engineering, and the cement is subjected to grinding, high-temperature calcination and other processes in the production process, so that a large amount of fuel and electric energy are consumed, and pollutants such as particulate matters are released. In addition, part of cement factories are close to residential houses, so that dust, waste gas, noise and the like are polluted, and a large amount of carbon dioxide gas is generated. The research shows that 0.85 ton of carbon dioxide is required to be discharged to the atmosphere every 1 ton of cement, the carbon dioxide discharged by the cement industry accounts for about 10% of the total amount of carbon dioxide artificially discharged in the world, and how to realize carbon reduction and carbon fixation becomes an important problem in the current environmental engineering research.
In view of the above problems, there is an urgent need for a new green material to replace cement, and the new green material needs to satisfy three conditions: firstly, from the aspect of practical engineering, the compressive strength is close to that of cement or even better; secondly, from the aspect of environment, the concept of energy conservation and emission reduction is to be satisfied, and the energy consumption and carbon emission in the production and use are lower than those of cement; thirdly, from the economical aspect, the price of the cement is not far higher than that of cement, and is preferably similar to or lower than that of cement for large-scale application.
Based on the method, a novel green material which has low energy consumption, low carbon emission, low cost and mechanical strength equivalent to that of cement is developed, and the novel green material can be used as a building engineering raw material instead of cement, has important significance for realizing the aim of reducing and fixing carbon, and is a technical problem to be solved by researchers.
Disclosure of Invention
The invention aims to provide a preparation method of a green gelling material which has low energy consumption, low carbon emission, low cost and mechanical strength equivalent to that of cement and can realize the carbon reduction and fixation effects.
The second purpose of the invention is to provide a green gelling material which has low energy consumption, low carbon emission, low cost and mechanical strength equivalent to cement and can realize the carbon reduction and fixation effects.
One of the achievement purposes of the invention adopts the technical proposal that: the preparation method of the green gel material capable of realizing the carbon reduction and fixation effects comprises the following steps:
s1, continuously introducing CO 2 Under the condition of (1), sodium hydroxide reacts with water to obtain sodium bicarbonate;
s2, mixing magnesium oxide and sodium bicarbonate according to the molar mass ratio of (2-4) to 1 to obtain a dry mixed material;
s3, adding water into the dry mixture according to the water-cement mass ratio of 0.5-0.55, uniformly mixing to obtain a mixture, pouring, oscillating and curing the mixture to a specified age, thus obtaining the green gelling material capable of realizing the carbon reduction and carbon fixation effects.
The invention provides a preparation method for mixing magnesium oxide and sodium bicarbonate, and adding water and uniformly stirring to form a cementing material, wherein the sodium bicarbonate is obtained by the reaction of sodium hydroxide and carbon dioxide in water absorption industrial waste gas, and is used as a carrier of carbon dioxide in practical engineering, so that the effect of recycling carbon dioxide is achieved, and the aim of reducing carbon and fixing carbon is fulfilled. Meanwhile, sodium hydroxide generated by sodium bicarbonate and magnesium oxide under the action of water can also absorb carbon dioxide in the air, so that the effects of reducing and fixing carbon are further realized. In addition, in the preparation and curing process of the cementing material, the magnesium oxide can absorb carbon dioxide to generate a carbonic acid compound of magnesium, so that the mechanical strength of the cementing material is increased, and the application requirement of the cementing material for having higher early strength is met.
Furthermore, compared with cement, the green gelling material provided by the invention not only reduces the emission of carbon dioxide in the preparation and use processes, but also has the price close to that of cement, and can also economically meet the requirement of low cost.
In the present invention, the main reaction processes involved are as follows:
2NaOH+CO 2 →Na 2 CO 3 +H 2 o chemical reaction formula (a);
Na 2 CO 3 +H 2 O+CO 2 →2NaHCO 3 chemical reaction formula (b);
NaHCO 3 +MgO+H 2 O→MgCO 3 ·3H 2 o+naoh formula (c);
or → Mg 5 (CO 3 ) 4 (OH) 2 ·5H 2 O (coccyx) +naoh chemical formula (d);
or → Mg 5 (CO 3 ) 4 (OH) 2 ·4H 2 O (hydromagnesite) +naoh chemical formula (e);
further, in the present invention, the molar mass ratio of magnesium oxide to sodium bicarbonate (the ratio of the mass of the substance per the amount of the substance) is defined as (2 to 4): 1, the research shows that in the proportion range, the mechanical property (compressive strength) of the prepared green gel material is higher than that of cement, so that the application requirement of the building engineering is met.
Further, the CO 2 From industrial waste gases or off-gases. The preparation process of the sodium bicarbonate can consume a large amount of carbon dioxide in industrial waste gas, improves the strength of the product, realizes the effect of reducing and fixing carbon, and has important significance on energy conservation and emission reduction.
Further, the magnesium oxide is selected from industrial magnesium oxide having an MgO content of 75 to 80wt.% (i.e. a purity of 75 to 80%).
Preferably, the molar mass ratio of magnesium oxide to sodium bicarbonate is 4:1. The research shows that the prepared green gel material has better mechanical strength under the condition of the proportion.
Preferably, in the present invention, a water cement ratio of 0.55, i.e., a mass ratio of water to the mixture of magnesium oxide and sodium bicarbonate of 0.55 is used, so that better molding and higher mechanical strength of the cement can be ensured.
Furthermore, the curing condition of the green gelling material capable of realizing the carbon reduction and fixation is 5-50 ℃, and the green gelling material is suitable for construction environments at different temperatures.
Preferably, the curing condition of the green gel material capable of realizing the carbon reduction and fixation is 20-50 ℃. More preferably, the curing condition of the green gel material capable of realizing the carbon reduction and fixation is 25+/-2 ℃. Under the condition, the compressive strength of the cementing material in the curing process is continuously increased, and the early compressive strength far higher than that of cement can be obtained, thereby having important significance for the application of building materials.
The second technical scheme adopted for realizing the purpose of the invention is as follows: the green gel material capable of achieving the carbon reduction and fixation effects is prepared by the preparation method according to one of the purposes of the invention.
Furthermore, the green gel material capable of realizing the carbon reduction and fixation has the 7d compressive strength of 26.42-32.09 MPa under the curing condition of 25+/-2 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention provides a preparation method of a green gelling material capable of realizing carbon reduction and fixation, which comprises the steps of firstly absorbing carbon dioxide in air by sodium hydroxide to generate sodium carbonate, then reacting the sodium carbonate with the carbon dioxide under the action of water to obtain the green gelling material, wherein the use of the sodium bicarbonate consumes the generated carbon dioxide; and secondly, sodium hydroxide, which is a product of sodium bicarbonate and magnesium oxide under the action of water, can also absorb carbon dioxide in the air, so that the emission of the carbon dioxide is greatly reduced, the carbon reduction and carbon fixation effects are achieved, and the method has important significance for improving the environment. Finally, the preparation method has the advantages that the required raw materials are easy to obtain, the price is close to that of cement, the economic benefit is high, the strength can be rapidly generated, and the strength within 7 days is higher than that of the conventional cement under the same curing condition.
(2) Compared with the traditional magnesia carbonization method, the preparation method of the green gel material capable of realizing the carbon reduction and fixation provided by the invention has the advantages that the magnesia and the sodium bicarbonate are mixed in a certain proportion to obtain a dry mixed material, and the problem of product strength difference caused by uneven carbon dioxide distribution is solved. In addition, in the invention, not only the mixing and solidifying stage of magnesium oxide and sodium bicarbonate can absorb carbon dioxide in the air, but also the preparation process of sodium bicarbonate can consume a large amount of CO in industrial waste gas or tail gas 2 The preparation method provided by the invention is taken as a whole of a technical scheme, and better effects of reducing and fixing carbon are realized.
(3) The green gelling material capable of realizing the carbon reduction and fixation effect is easy to obtain the required raw materials, has the price close to that of cement, has higher economic benefit, can quickly generate strength, is cured for 7 days at the room temperature of 25 ℃, has the compressive strength of 26.42-32.09 MPa, is higher than the conventional cement with the same curing condition, and has wide popularization and application prospects in construction engineering.
Drawings
FIG. 1 is a schematic flow chart of a preparation method of a green gel material capable of realizing carbon reduction and carbon fixation;
FIG. 2 is a graph showing the compressive strength of the cement prepared in examples 1 to 3 and comparative examples 1 to 5 according to the present invention;
FIG. 3 is a graph showing the compressive strength of the cement prepared in example 1 according to the present invention at different curing temperatures;
FIG. 4 is a graph showing pore size-pore volume comparison of the cement prepared in example 3 of the present invention and comparative example 3;
FIG. 5 is a graph showing the porosity distribution of the cement prepared in example 3 of the present invention and comparative example 3;
FIG. 6 is an XRD pattern of the cement prepared in example 3 and comparative example 3 according to the present invention, cured at 25℃for 7 d.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be further illustrated, but is not limited, by the following examples.
The magnesium oxide used in examples 1-3 of the present invention is industrial magnesium oxide, and its main components and contents are shown in Table 1 below:
TABLE 1
| Chemical composition | MgO | SiO 2 | Al 2 O 3 | CaO | SO 3 | Na 2 O | F | Others |
| Content/wt.% | 76.72 | 10.23 | 6.34 | 5.62 | 0.55 | 0.27 | 0.10 | 0.18 |
Example 1
Step 1: adding sodium hydroxide into water under stirring to dissolve completely, and continuously introducing excessive CO into the reaction device 2 Fully reacting to obtain an initial product; purifying and fully drying the initial product to obtain a final product sodium bicarbonate;
step 2: magnesium oxide and sodium bicarbonate in the step 1 are mixed according to a molar mass ratio of 2:1, uniformly mixing to obtain a dry mixed material;
step 3: adding water into the dry blend according to the water-cement mass ratio of 0.55, uniformly mixing to obtain a blend, pouring, oscillating and curing the blend to a specified age, thus obtaining the green gel material capable of realizing the carbon reduction and carbon fixation.
Example 2
Step 1:adding sodium hydroxide into water under stirring to dissolve completely, and continuously introducing excessive CO into the reaction device 2 Fully reacting to obtain an initial product; purifying and fully drying the initial product to obtain a final product sodium bicarbonate;
step 2: magnesium oxide and sodium bicarbonate in the step 1 are mixed according to a molar mass ratio of 3:1, uniformly mixing to obtain a dry mixed material;
step 3: adding water into the dry blend according to the water-cement mass ratio of 0.55, uniformly mixing to obtain a blend, pouring, oscillating and curing the blend to a specified age, thus obtaining the green gel material capable of realizing the carbon reduction and carbon fixation.
Example 3
Step 1: adding sodium hydroxide into water under stirring to dissolve completely, and continuously introducing excessive CO into the reaction device 2 Fully reacting to obtain an initial product; purifying and fully drying the initial product to obtain a final product sodium bicarbonate;
step 2: magnesium oxide and sodium bicarbonate in the step 1 are mixed according to a molar mass ratio of 4:1, uniformly mixing to obtain a dry mixed material;
step 3: adding water into the dry blend according to the water-cement mass ratio of 0.55, uniformly mixing to obtain a blend, pouring, oscillating and curing the blend to a specified age, thus obtaining the green gel material capable of realizing the carbon reduction and carbon fixation.
Comparative example 1
Adopting ordinary Portland cement with the strength grade of 42.5, and uniformly mixing Portland cement and water according to the water-cement mass ratio of 0.55 to obtain a mixture; pouring and oscillating the mixture, and curing the mixture to a specified age to obtain the cementing material.
Comparative example 2
Uniformly mixing magnesium oxide and water according to a water ash mass ratio of 0.55 to obtain a mixture; pouring and oscillating the mixture, and curing the mixture to a specified age to obtain the cementing material.
Comparative example 3
Step 1: adding sodium hydroxide into water under stirring to dissolve completely, and loading into reaction vesselContinuously introducing excessive CO 2 Fully reacting to obtain an initial product; purifying and fully drying the initial product to obtain a final product sodium bicarbonate;
step 2: magnesium oxide and sodium bicarbonate in the step 1 are mixed according to the molar mass ratio of 1:2, uniformly mixing to obtain a dry mixed material;
step 3: adding water into the dry blend according to the water-cement mass ratio of 0.55, uniformly mixing to obtain a blend, pouring, oscillating and curing the blend to a specified age, thus obtaining the green gel material capable of realizing the carbon reduction and carbon fixation.
Comparative example 4
Step 1: adding sodium hydroxide into water under stirring to dissolve completely, and continuously introducing excessive CO into the reaction device 2 Fully reacting to obtain an initial product; purifying and fully drying the initial product to obtain a final product sodium bicarbonate;
step 2: uniformly mixing magnesium oxide and sodium bicarbonate in the step 1 according to a molar mass ratio of 1:1 to obtain a dry mixed material;
step 3: adding water into the dry blend according to the water-cement mass ratio of 0.55, uniformly mixing to obtain a blend, pouring, oscillating and curing the blend to a specified age, thus obtaining the green gel material capable of realizing the carbon reduction and carbon fixation.
Comparative example 5
Step 1: adding sodium hydroxide into water under stirring to dissolve completely, and continuously introducing excessive CO into the reaction device 2 Fully reacting to obtain an initial product; purifying and fully drying the initial product to obtain a final product sodium bicarbonate;
step 2: magnesium oxide and sodium bicarbonate in the step 1 are mixed according to a molar mass ratio of 5:1, uniformly mixing to obtain a dry mixed material;
step 3: adding water into the dry blend according to the water-cement mass ratio of 0.55, uniformly mixing to obtain a blend, pouring, oscillating and curing the blend to a specified age, thus obtaining the green gel material capable of realizing the carbon reduction and carbon fixation.
Performance testing
Test of compressive Strength
Pressing the cementing materials prepared in the examples 1-3 and the comparative examples 1-5 into square dies with the dimensions of 20mm by 20mm respectively, and oscillating to discharge bubbles until the bubbles are completely compacted; wrapping the mold sample with a preservative film, curing for a period of time at 25 ℃ (6 h, 1d and 7d respectively), and demolding to obtain a compacted sample. An unconfined compressive strength test was performed on each compacted sample using a 20kN pressure tester, and the test results are shown in table 2 and fig. 2 below:
TABLE 2
As can be seen from the above table, the data,
examples 1-3 control the molar mass ratio of magnesium oxide to sodium bicarbonate to be (2-4): at 1, the compressive strength for 6 hours was higher than that of the cement of comparative example 1 and the pure magnesia of comparative example 2. Further, in examples 1 to 3, the compressive strengths of 6h, 1d and 7d all showed a tendency to gradually rise with an increase in the content of magnesium oxide, and were higher than those of cements 1d and 7d in comparative example 1. Wherein the molar mass ratio of magnesium oxide to sodium bicarbonate was controlled to be 4 in example 3:1, the compressive strength of each stage of curing is the maximum value, and the 7d compressive strength is 32.09MPa.
The test results of comparative examples 3 to 5 show that when the molar mass ratio of magnesium oxide to sodium bicarbonate is higher or lower than (2 to 4): in the step 1, the compressive strength of the product after 7d curing is 11.80-18.24 MPa, which is lower than that of the cement sample in the comparative example 1. In comparative example 5, the molar mass ratio of magnesium oxide to sodium bicarbonate was 5:1, and the compressive strength of 7d was 17.41MPa although the molar mass ratio was high (20.14 MPa) with 1d compressive strength, and the mechanical strength was retracted. This means that in the present invention, the molar mass ratio of magnesium oxide to sodium bicarbonate is controlled to be (2 to 4): 1, is an important precondition for ensuring that the early mechanical strength of the cementing material is superior to that of cement.
(II) influence of curing temperature on mechanical Properties
Pressing the cementing material prepared in the embodiment 1 into a square die with the dimensions of 20mm by 20mm, and oscillating to discharge bubbles until the cementing material is completely compacted; and wrapping the mold sample with a preservative film, curing for a period of time (6 h, 1d and 7d respectively) at the temperature of 5 ℃ and the room temperature (25 ℃) and the temperature of 50 ℃ respectively, and demolding to obtain a compacted sample. An unconfined compressive strength test was performed on each compacted sample using a 20kN pressure tester, and the test results are shown in fig. 3:
as can be seen from FIG. 3, the cement prepared in example 1 has a compressive strength which is continuously improved with curing time at 25℃and has a compressive strength higher than that at 5℃and 50 ℃. The cementing material provided by the invention can obtain compressive strength which is far higher than that of cement produced at early stage under the curing condition of room temperature (25+/-2 ℃), is 26.42-32.09 MPa, and has great significance in the application of building materials.
(III) influence of microstructure of product on mechanical Properties
The T2 spectra including T2 relaxation time and strength of the gelled materials (cured at 25 ℃ for 7 d) obtained in example 3 and comparative example 3 were obtained by NMR (nuclear magnetic resonance spectroscopy), and were converted into a relationship between pore diameter (pore radius) and pore volume for analysis, and the results are shown in fig. 4 and 5.
As can be seen from fig. 4 and 5, the molar mass ratio of magnesium oxide to sodium bicarbonate in comparative example 3 is 1:2, the formed cementing material has more large pore size and volume; in contrast, the molar mass ratio of magnesium oxide to sodium bicarbonate in example 3 is 4: the small pore volume is more in 1 time, and the magnesium oxide: sodium bicarbonate = 4:1 the cement has a smaller porosity, probably due to the reaction of magnesium oxide and sodium bicarbonate filling the larger pores, a new pore size distribution is formed, thus increasing the strength of the cement.
Further, as can be seen from analysis of the XRD pattern in connection with FIG. 6, the molar mass ratio of magnesium oxide to sodium bicarbonate in comparative example 3 is 1:2, less carbonate forms to form magnesium from the cement; whereas the molar mass ratio of magnesium oxide to sodium bicarbonate in example 3 was 4:1, magnesium oxide was not reacted, indicating that sodium bicarbonate was consumed, which may be one of the main reasons for the higher compressive strength of the cement formed in example 3.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the teachings of the present invention, which are intended to be included within the scope of the present invention.
Claims (10)
1. A preparation method of a green gel material capable of realizing carbon reduction and carbon fixation comprises the following steps:
s1, continuously introducing CO 2 Under the condition of (1), sodium hydroxide reacts with water to obtain sodium bicarbonate;
s2, mixing magnesium oxide and sodium bicarbonate according to a molar mass ratio of (2-4): 1, mixing to obtain a dry mixed material;
s3, adding water into the dry mixture according to the water-cement mass ratio of 0.5-0.55, uniformly mixing to obtain a mixture, pouring, oscillating and curing the mixture to a specified age, thus obtaining the green gelling material capable of realizing the carbon reduction and carbon fixation effects.
2. The method according to claim 1, wherein in the step S1, CO 2 From industrial waste gases or off-gases.
3. The preparation method according to claim 2, wherein the magnesium oxide is selected from industrial magnesium oxide having a purity of 75 to 80%.
4. A process according to claim 3, wherein the molar mass ratio of magnesium oxide to sodium bicarbonate is 4:1.
5. The method according to claim 4, wherein the water-ash mass ratio in the step S3 is 0.55.
6. The method according to claim 5, wherein the curing conditions of the green gelling material capable of achieving the carbon-reduction and carbon-fixation effect are 5-50 ℃.
7. The method according to claim 6, wherein the curing conditions of the green gel material capable of achieving the carbon reduction and fixation are 20 to 50 ℃.
8. The method according to claim 7, wherein the curing conditions of the green gelling material capable of achieving the carbon reduction and fixation are 25±2 ℃.
9. A green gel material capable of achieving a carbon-reducing and carbon-fixing effect, characterized in that the green gel material capable of achieving a carbon-reducing and carbon-fixing effect is produced by the production method according to any one of claims 1 to 8.
10. The green gel material capable of realizing the carbon reduction and fixation according to claim 9, wherein the green gel material capable of realizing the carbon reduction and fixation has a 7d compressive strength of 26.42-32.09 MPa under the curing condition of 25+/-2 ℃.
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| CN (1) | CN116102272A (en) |
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| US20120291675A1 (en) * | 2009-06-17 | 2012-11-22 | Chris Camire | Methods and products utilizing magnesium oxide for carbon dioxide sequestration |
| CN104478256A (en) * | 2014-11-18 | 2015-04-01 | 南京工业大学 | Calcium-magnesium carbonate gel material and preparation method thereof |
| CN107324753A (en) * | 2017-04-10 | 2017-11-07 | 南京工业大学 | A kind of carbonate binder materials and preparation method thereof |
| WO2018139975A1 (en) * | 2017-01-25 | 2018-08-02 | Nanyang Technological University | Enhanced reactive magnesia cement-based concrete mixes |
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2023
- 2023-01-06 CN CN202310018447.0A patent/CN116102272A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120291675A1 (en) * | 2009-06-17 | 2012-11-22 | Chris Camire | Methods and products utilizing magnesium oxide for carbon dioxide sequestration |
| CN104478256A (en) * | 2014-11-18 | 2015-04-01 | 南京工业大学 | Calcium-magnesium carbonate gel material and preparation method thereof |
| WO2018139975A1 (en) * | 2017-01-25 | 2018-08-02 | Nanyang Technological University | Enhanced reactive magnesia cement-based concrete mixes |
| CN107324753A (en) * | 2017-04-10 | 2017-11-07 | 南京工业大学 | A kind of carbonate binder materials and preparation method thereof |
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