PREPARATION METHOD OF SUPPLEMENTARY CEMENTITIOUS MATERIAL BASED ON ELECTROSTATIC ADSORPTION FOR HIGH-EFFICIENCY CO2 SEQUESTRATION

Abstract

A preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration is provided. The preparation method of the present disclosure includes the following steps: placing ultrafine carbide slag powder into an electrostatic field to make the ultrafine carbide slag powder have electrostatic charge, and obtaining ultrafine carbide slag powder with electrostatic charge; and uniformly mixing low-calcium fly ash and the ultrafine calcium carbide slag powder with electrostatic charge, followed by adding into a rotary packed bed; continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed; after a reaction, collecting a material and drying to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

Claims

1. A preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration, comprising steps of: (1), placing ultrafine carbide slag powder into an electrostatic field to make the ultrafine carbide slag powder have electrostatic charge, and obtaining ultrafine carbide slag powder with electrostatic charge; and (2), uniformly mixing low-calcium fly ash and the ultrafine calcium carbide slag powder with electrostatic charge, followed by adding into a rotary packed bed; continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed; after a reaction, collecting a material and drying to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

2. The preparation method of the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration according to claim 1, wherein a step (1) comprises one or more of following conditions: i: a particle size of the ultrafine carbide slag powder is 1000-2500 meshes; and the ultrafine carbide slag powder is prepared by drying and grinding carbide slag; ii: the ultrafine carbide slag powder comprises following components in parts by mass: 86.26-89.21 parts of CaO, 3.12-5.41 parts of SiO.sub.2, 4.01-6.75 parts of SO.sub.3, 1.39-2.27 parts of Al.sub.2O.sub.3 and 0.21-1.97 parts of MgO.

3. The preparation method of the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration according to claim 1, wherein in a step (2), a particle size of the low-calcium fly ash is 150-500 meshes.

4. The preparation method of the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration according to claim 1, wherein in the step (2), the low-calcium fly ash comprises following components in parts by mass: 2.32-3.76 parts of CaO, 44.01-57.89 parts of SiO.sub.2, 23.24-31.34 parts of Fe.sub.2O.sub.3, 2.27-5.15 parts of Fe.sub.2O.sub.3 and 0.63-3.97 parts of MgO.

5. The preparation method of the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration according to claim 1, wherein in the step (2), a mass ratio of the low-calcium fly ash to the ultrafine carbide slag powder with electrostatic charge is 60-90:10-30.

6. The preparation method of the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration according to claim 1, wherein in the step (2), a continuous flow rate of industrial waste gas containing CO.sub.2 and water vapor is 3-5 L/min.

7. The preparation method of the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration according to claim 1, wherein in the step (2), the industrial waste gas containing CO.sub.2 and water vapor comprises following components in percentage by volume: 9-10% of water vapor, 25-26% of CO.sub.2 and 60-61% of nitrogen; wherein the industrial waste gas containing CO.sub.2 and water vapor comprises following components in percentage by volume: 9.6% of water vapor, 25.4% of CO.sub.2 and 60.5% of nitrogen.

8. The preparation method of the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration according to claim 1, wherein in the step (2), a reaction duration is 5-15 min; a rotating speed of the rotary packed bed is 300-500 r/min; a temperature of the rotary packed bed is 20-30 C. and a pressure is 0.05-0.5 MPa.

9. A supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration prepared by the preparation method according to claim 1.

10. A use method of the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration according to claim 9, comprising following steps: compounding the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration with cement, followed by applying in concrete and mortar; wherein a mass ratio of the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration to cement is 20-40:60-80.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The FIGURE is a process illustrating a preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration provided by the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the technical problems, technical solutions and advantages to be solved by the present disclosure clearer, the following will be described in detail with specific embodiments, but not limited to this. Anything not described in detail in the present disclosure shall follow the conventional technology in this field.

[0033] The present disclosure relates to a preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration, including following steps as shown in the FIGURE: [0034] step 1, placing ultrafine carbide slag powder into an electrostatic field to make the ultrafine carbide slag powder have electrostatic charge, and obtaining ultrafine carbide slag powder with electrostatic charge; and [0035] step 2, uniformly mixing low-calcium fly ash and the ultrafine calcium carbide slag powder with electrostatic charge, followed by adding into a rotary packed bed; continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed; after a reaction, collecting a material and drying to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

[0036] In the embodiments, the ultrafine carbide slag powder includes the following components in percentage by mass: CaO 88.10%, SiO.sub.2 3.51%, SO.sub.3 5.77%, Al.sub.2O.sub.31.91% and MgO 0.35%.

[0037] The low-calcium fly ash includes the following components in percentage by mass: CaO 2.56 wt %, SiO.sub.2 57.25 wt %, Al.sub.2O.sub.323.24 wt %, Fe.sub.2O.sub.3 5.02 wt % and MgO 1.97 wt %.

[0038] The industrial waste gas containing CO.sub.2 and water vapor includes the following components by volume: 9.6% of water vapor, 25.4% of CO.sub.2, 60.5% of nitrogen and 4.5% of other components.

Embodiment 1

[0039] The present disclosure relates to a preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration, which includes the following steps: [0040] (1) oven drying and grinding carbide slag to obtain ultrafine carbide slag powder with 1000 meshes, and placing the ultrafine carbide slag powder in an electrostatic field generated by a discharge mechanism to make it electrostatically charged to obtain ultrafine carbide slag powder with electrostatic charge; [0041] (2) mixing low-calcium fly ash (150-500 meshes) with the ultrafine carbide slag powder with electrostatic charge in a mixer for 5 min, making the carbide slag uniformly attached to the surface of the fly ash, where the mass ratio of the low-calcium fly ash to the ultrafine carbide slag powder with electrostatic charge is 80:20, and the mixture enters a rotary packed bed through a feed port, and the ultrafine carbide slag powder with electrostatic charge is adsorbed with low-calcium fly ash particles by electrostatic adsorption; [0042] (3) continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed, controlling the flow rate to be 4 L/min, and starting the rotating device, where the rotating speed is 300 r/min, the temperature is controlled to be 25 C., and the pressure is controlled to be 0.1 MPa; and [0043] (4) after 10 min of reaction, allowing the reacted slurry to flow out from the bottom of the reactor into a collection vessel and the gas to be discharged from the top of the rotating packed bed, pumping and filtering and drying the reacted slurry to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

Embodiment 2

[0044] A preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration, including the following steps: [0045] (1) oven drying and grinding carbide slag to obtain ultrafine carbide slag powder with 1000 meshes, and placing the ultrafine carbide slag powder in an electrostatic field generated by a discharge mechanism to make it electrostatically charged to obtain ultrafine carbide slag powder with electrostatic charge; [0046] (2) mixing low-calcium fly ash (150-500 meshes) with the ultrafine carbide slag powder with electrostatic charge in a mixer for 5 min, making the carbide slag uniformly attached to the surface of the fly ash, where the mass ratio of the low-calcium fly ash to the ultrafine carbide slag powder with electrostatic charge is 80:20, and the mixture enters a rotary packed bed through a feed port, and the ultrafine carbide slag powder with electrostatic charge is adsorbed with low-calcium fly ash particles by electrostatic adsorption; [0047] (3) continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed, controlling the flow rate to be 4 L/min, and starting the rotating device, where the rotating speed is 400 r/min, the temperature is controlled to be 25 C., and the pressure is controlled to be 0.1 MPa; and [0048] (4) after 10 min of reaction, allowing the reacted slurry to flow out from the bottom of the reactor into a collection vessel and the gas to be discharged from the top of the rotating packed bed, pumping and filtering and drying the reacted slurry to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

Embodiment 3

[0049] A preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration, which includes the following steps: [0050] (1) oven drying and grinding carbide slag to obtain ultrafine carbide slag powder with 1000 meshes, and placing the ultrafine carbide slag powder in an electrostatic field generated by a discharge mechanism to make it electrostatically charged to obtain ultrafine carbide slag powder with electrostatic charge; [0051] (2) mixing low-calcium fly ash (150-500 meshes) with the ultrafine carbide slag powder with electrostatic charge in a mixer for 5 min, making the carbide slag uniformly attached to the surface of the fly ash, where the mass ratio of the low-calcium fly ash to the ultrafine carbide slag powder with electrostatic charge is 80:20, and the mixture enters a rotary packed bed through a feed port, and the ultrafine carbide slag powder with electrostatic charge is adsorbed with low-calcium fly ash particles by electrostatic adsorption; [0052] (3) continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed, controlling the flow rate to be 4 L/min, and starting the rotating device, where the rotating speed is 500 r/min, the temperature is controlled to be 25 C., and the pressure is controlled to be 0.1 MPa; and [0053] (4) after 10 min of reaction, allowing the reacted slurry to flow out from the bottom of the reactor into a collection vessel and the gas to be discharged from the top of the rotating packed bed, pumping and filtering and drying the reacted slurry to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

Embodiment 4

[0054] A preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration, which includes the following steps: [0055] (1) oven drying and grinding carbide slag to obtain ultrafine carbide slag powder with 1500 meshes, and placing the ultrafine carbide slag powder in an electrostatic field generated by a discharge mechanism to make it electrostatically charged to obtain ultrafine carbide slag powder with electrostatic charge; [0056] (2) mixing low-calcium fly ash (150-500 meshes) with the ultrafine carbide slag powder with electrostatic charge in a mixer for 5 min, making the carbide slag uniformly attached to the surface of the fly ash, where the mass ratio of the low-calcium fly ash to the ultrafine carbide slag powder with electrostatic charge is 80:20, and the mixture enters a rotary packed bed through a feed port, and the ultrafine carbide slag powder with electrostatic charge is adsorbed with low-calcium fly ash particles by electrostatic adsorption; [0057] (3) continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed, controlling the flow rate to be 4 L/min, and starting the rotating device, where the rotating speed is 500 r/min, the temperature is controlled to be 25 C., and the pressure is controlled to be 0.1 MPa; and [0058] (4) after 10 min of reaction, allowing the reacted slurry to flow out from the bottom of the reactor into a collection vessel and the gas to be discharged from the top of the rotating packed bed, pumping and filtering and drying the reacted slurry to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

Embodiment 5

[0059] A preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration, which includes the following steps: [0060] (1) oven drying and grinding carbide slag to obtain ultrafine carbide slag powder with 2000 meshes, and placing the ultrafine carbide slag powder in an electrostatic field generated by a discharge mechanism to make it electrostatically charged to obtain ultrafine carbide slag powder with electrostatic charge; [0061] (2) mixing low-calcium fly ash (150-500 meshes) with the ultrafine carbide slag powder with electrostatic charge in a mixer for 5 min, making the carbide slag uniformly attached to the surface of the fly ash, where the mass ratio of the low-calcium fly ash to the ultrafine carbide slag powder with electrostatic charge is 80:20, and the mixture enters a rotary packed bed through a feed port, and the ultrafine carbide slag powder with electrostatic charge is adsorbed with low-calcium fly ash particles by electrostatic adsorption; [0062] (3) continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed, controlling the flow rate to be 4 L/min, and starting the rotating device, where the rotating speed is 500 r/min, the temperature is controlled to be 25 C., and the pressure is controlled to be 0.1 MPa; and [0063] (4) after 10 min of reaction, allowing the reacted slurry to flow out from the bottom of the reactor into a collection vessel and the gas to be discharged from the top of the rotating packed bed, pumping and filtering and drying the reacted slurry to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

Embodiment 6

[0064] A preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration, which includes the following steps: [0065] (1) oven drying and grinding carbide slag to obtain ultrafine carbide slag powder with 2500 meshes, and placing the ultrafine carbide slag powder in an electrostatic field generated by a discharge mechanism to make it electrostatically charged to obtain ultrafine carbide slag powder with electrostatic charge; [0066] (2) mixing low-calcium fly ash (150-500 meshes) with the ultrafine carbide slag powder with electrostatic charge in a mixer for 5 min, making the carbide slag uniformly attached to the surface of the fly ash, where the mass ratio of the low-calcium fly ash to the ultrafine carbide slag powder with electrostatic charge is 80:20, and the mixture enters a rotary packed bed through a feed port, and the ultrafine carbide slag powder with electrostatic charge is adsorbed with low-calcium fly ash particles by electrostatic adsorption; [0067] (3) continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed, controlling the flow rate to be 4 L/min, and starting the rotating device, where the rotating speed is 500 r/min, the temperature is controlled to be 25 C., and the pressure is controlled to be 0.1 MPa; and [0068] (4) after 10 min of reaction, allowing the reacted slurry to flow out from the bottom of the reactor into a collection vessel and the gas to be discharged from the top of the rotating packed bed, pumping and filtering and drying the reacted slurry to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

Embodiment 7

[0069] A preparation method of a supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration, which includes the following steps: [0070] (1) oven drying and grinding carbide slag to obtain ultrafine carbide slag powder with 2500 meshes, and placing the ultrafine carbide slag powder in an electrostatic field generated by a discharge mechanism to make it electrostatically charged to obtain ultrafine carbide slag powder with electrostatic charge; [0071] (2) mixing low-calcium fly ash (150-500 meshes) with the ultrafine carbide slag powder with electrostatic charge in a mixer for 5 min, making the carbide slag uniformly attached to the surface of the fly ash, where the mass ratio of the low-calcium fly ash to the ultrafine carbide slag powder with electrostatic charge is 70:30, and the mixture enters a rotary packed bed through a feed port, and the ultrafine carbide slag powder with electrostatic charge is adsorbed with low-calcium fly ash particles by electrostatic adsorption; [0072] (3) continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed, controlling the flow rate to be 4 L/min, and starting the rotating device, where the rotating speed is 500 r/min, the temperature is controlled to be 25 C., and the pressure is controlled to be 0.1 MPa; and [0073] (4) after 10 min of reaction, allowing the reacted slurry to flow out from the bottom of the reactor into a collection vessel and the gas to be discharged from the top of the rotating packed bed, pumping and filtering and drying the reacted slurry to obtain the supplementary cementitious material based on electrostatic adsorption for high-efficiency CO.sub.2 sequestration.

Comparative Embodiment 1

[0074] A preparation method of a cementitious material includes the following steps: [0075] (1) drying and grinding carbide slag to obtain ultrafine carbide slag powder with 2500 meshes; [0076] (2) mixing low-calcium fly ash (150-500 meshes) and ultrafine carbide slag powder in a mixer for 5 min to mix evenly, where the mass ratio of the low-calcium fly ash to the ultrafine carbide slag powder is 80:20, and the mixture enters a rotary packed bed through a feed inlet; [0077] (3) continuously introducing industrial waste gas containing CO.sub.2 and water vapor into the rotary packed bed, controlling the flow rate to be 4 L/min, and starting the rotating device, where the rotating speed is 500 r/min, the temperature is controlled to be 25 C., and the pressure is controlled to be 0.1 MPa; and [0078] (4) after 10 min of reaction, allowing the reacted slurry to flow out from the bottom of the reactor into a collection vessel and the gas to be discharged from the top of the rotating packed bed, pumping and filtering and drying the reacted slurry to obtain the cementitious material.

Test Embodiment 1

[0079] The CO.sub.2 sequestration capacity of the cementitious materials prepared in Embodiments 1-7 and Comparative embodiment 1 is tested, and the test results are shown in Table 1 below. The CO.sub.2 sequestration capacity of cementitious materials is obtained by thermogravimetric analyzer. At 600 C.-800 C., CaCO.sub.3 produced by carbonization is decomposed into CaO and CO.sub.2, and the CO.sub.2 sequestration capacity is obtained by weight loss.

TABLE-US-00001 TABLE 1 CO.sub.2 sequestration capacity of cementitious materials prepared in Embodiments 1-7 and Comparative embodiment 1 Mesh of calcium Rotating Sequestration Implementation carbide speed amount of embodiments slag(meshes) (r/min) CO.sub.2 (g/kg) Embodiment 1 1000 300 111.65 Embodiment 2 1000 400 112.57 Embodiment 3 1000 500 114.45 Embodiment 4 1500 500 120.94 Embodiment 5 2000 500 123.82 Embodiment 6 2500 500 125.94 Embodiment 7 2500 500 129.56 Comparative 2500 500 72.35 embodiment 1

Test Embodiment 2

[0080] The standard mortar mechanical properties of cementing materials prepared in Embodiments 1-7 and Comparative embodiment 1 are tested, and the test results are shown in Table 2 below. Experimental conditions: 135 g of cementitious materials and 315 g of P.I42.5 cement are used as the cementitious system, and are mixed and stirred with 225 g of water and 1350 g of ISO sand according to Technical Code for Application of Mineral Admixture (GB/T51003-2014). According to Test Method of Cement Mortar Strength (ISO Method) (GB/T17671-2021), after demoulding, the specimen is cured in water at 20 C.1 C. for 28 days.

[0081] At the same time, the control group is set up, namely: [0082] Low-calcium fly ash/P.I 42.5 cement group: [0083] 135 g of low-calcium fly ash (the composition is the same as the above embodiments) and 315 g of P.I 42.5 cement are mixed to be used as the cementitious system; other experimental methods are the same as above, and the compressive strength of 28 d is tested.

[0084] P.I 42.5 cement group: 450 g of P.I 42.5 cement is used as the cementitious system; other experimental methods are the same as above, and the compressive strength of 28d is tested.

TABLE-US-00002 TABLE 2 Standard mortar mechanical properties of cementitious materials prepared in Embodiments 1 to 7 and Comparative embodiment 1 Compressive strength Implementation embodiments of 28d (MPa) Embodiment 1 39.9 Embodiment 2 40.5 Embodiment 3 40.8 Embodiment 4 41.4 Embodiment 5 42.2 Embodiment 6 44.2 Embodiment 7 45.0 Comparative embodiment 1 37.1 Low-calcium fly ash/P.I 42.5 cement group 34.3 P.I 42.5 cement group 44.6

Test Embodiment 3

[0085] The water requirement of normal consistency and initial and final setting time of cementitious materials prepared in Embodiments 1-7 and Comparative embodiment 1 are tested, and the test results are shown in Table 3 below. Experimental conditions: 150 g of cementitious material and 350 g of P.I 42.5 cement are mixed as the cementitious system, and the water requirement of normal consistency is obtained by testing according to Test Methods for Water Requirement of Normal Consistency, Setting Time and Soundness of the Portland Cement (GB/T1346-2011), and the initial setting time and final setting time of cementitious material are obtained according to the water requirement of normal consistency.

[0086] At the same time, the control group is set up, namely: [0087] Low-calcium fly ash/P.I42.5 cement group: 150 g of low-calcium fly ash (the composition is the same as the above embodiments) and 350 g of P.I 42.5 cement are mixed to be used as the cementitious system; other experimental methods are the same as above, and the water requirement of normal consistency and the initial and final setting time are tested.

[0088] P.I42.5 cement group: 500 g of P.I42.5 cement is used as the cementitious system; other experimental methods are the same as above, and the water requirement of normal consistency and the initial and final setting time are tested.

TABLE-US-00003 TABLE 3 Water requirement of normal consistency and initial and final setting time of cementitious materials prepared in Embodiments 1 to 7 and Comparative embodiment 1 Water Requirement Initial Final Implementation of Normal setting setting embodiments Consistency (%) time (min) time (min) Embodiment 1 26.6 145 210 Embodiment 2 26.9 141 200 Embodiment 3 27.8 138 197 Embodiment 4 28.0 131 191 Embodiment 5 28.6 124 184 Embodiment 6 29.2 119 180 Embodiment 7 29.8 114 176 Comparative embodiment 1 32.5 153 220 Low-calcium fly ash/P.I 25.5 225 305 42.5 cement group P.I 42.5 cement group 26.0 115 180

[0089] The specific embodiments of the present disclosure described above do not limit the scope of protection of the present disclosure. Any other corresponding changes and deformations made according to the technical concept of the present disclosure should be included in the protection scope of the claims of the present disclosure.