Adsorption molecular sieve prepared from blast furnace slag and application of adsorption molecular sieve in CO2 adsorption
The adsorption molecular sieve prepared from blast furnace slag, through acid dissolution treatment and hydrothermal reaction, solves the problem of poor CO2 adsorption effect of traditional molecular sieves, realizes efficient CO2 adsorption and environmentally friendly economic benefits, and expands the application prospects of molecular sieves.
Patent Information
- Application Number
- CN202511259152.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-04
- Publication Date
- 2025-10-31
AI Technical Summary
In existing technologies, molecular sieves prepared using traditional synthetic raw materials have poor CO2 adsorption performance, and the method of separating carbon dioxide by adsorption with liquid amine solution is energy-intensive, leading to increased costs for industrial applications.
Using blast furnace slag as raw material, gels were prepared through acid dissolution treatment, and the calcium and magnesium contents were controlled. Combined with aluminum source, template agent and alkali source, hydrothermal reaction was carried out to synthesize adsorption molecular sieves with FAU, MFI, CHA, LTA and BEA framework topologies.
It achieves high CO2 adsorption performance, reduces the cost of molecular sieve preparation, solves the environmental pollution problem caused by blast furnace slag accumulation, provides economic benefits, and broadens the source of raw materials for molecular sieve preparation.
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Figure CN120860981A_ABST
Abstract
Description
Technical Field
[0001] This application relates to an adsorption molecular sieve prepared using blast furnace slag and its application in CO2 adsorption. Background Technology
[0002] With the continuous rise in global energy demand and the massive consumption of fossil fuels, carbon dioxide (CO2) emissions have increased dramatically. This has not only triggered the greenhouse effect, leading to increasingly severe global warming, but also caused a series of serious ecological and environmental problems such as sea-level rise. Statistics show that the atmospheric CO2 concentration increased from 280 ppm during the Industrial Revolution to 417 ppm in 2022, with CO2 emissions increasing at a rate of 4% annually. Therefore, developing efficient CO2 emission reduction and capture technologies has become an urgent global need to address climate change. Adsorption methods, due to their advantages of low energy consumption, mild conditions, high stability, and strong regenerability, have become the most effective method for CO2 capture. Industrially, liquid amine solutions are mainly used for CO2 adsorption and separation. However, this method suffers from many problems, such as high energy consumption during adsorbent regeneration, equipment corrosion caused by alkaline solutions, and increased system maintenance costs. These significantly increase industrial costs and severely restrict its large-scale application. Therefore, developing a solid adsorbent material with high CO2 adsorption capacity, high selectivity, and excellent cycle stability to meet the needs of industrial CO2 capture applications is crucial.
[0003] Zeolite molecular sieves are aluminosilicate microporous materials with excellent selective adsorption properties for CO2. Since the early 1960s, extensive research has focused on synthesizing zeolite molecular sieves using inexpensive minerals or solid wastes (such as kaolin, fly ash, and coal gangue) as raw materials, and related technologies have achieved a certain degree of industrialization. Traditional synthetic raw materials have complex compositions, making it difficult to efficiently utilize their main elements (Si and Al). Blast furnace slag, an inevitable byproduct of ironmaking, contains a large amount of SiO2. A simple two-step method can be used to first synthesize silica gel with a silica content greater than 65%, and then hydrothermally synthesize zeolite molecular sieves. This process achieves the dual benefits of reducing CO2 emissions and treating solid waste.
[0004] However, the molecular sieves obtained by the existing methods do not have a good adsorption effect on CO2, and it is necessary to improve the existing treatment methods. Summary of the Invention
[0005] To address the aforementioned problems, this application proposes an adsorption molecular sieve prepared using blast furnace slag, comprising the following steps:
[0006] Blast furnace slag is crushed to obtain blast furnace slag particles;
[0007] Blast furnace slag particles are acid-dissolved and filtered to obtain filter residue as a gel.
[0008] The gel is mixed with an aluminum source, a template agent, an alkali source, and water to obtain a mixture.
[0009] The mixture was subjected to a hydrothermal reaction, and then filtered, washed, and dried to obtain an adsorption molecular sieve.
[0010] The gel contains 0.8-10.7 wt% CaO and 0.1-1.1 wt% MgO. This application utilizes filter residue obtained by acid dissolution of blast furnace slag particles as a gel, and controls the calcium and magnesium content in the gel through raw material control and acid dissolution treatment, resulting in a molecular sieve with excellent CO2 adsorption performance.
[0011] Preferably, the acid used in the acid dissolution treatment is hydrochloric acid, the HCl concentration in the hydrochloric acid is 2-6 mol / L, the liquid-solid ratio of hydrochloric acid to blast furnace slag is 12:1 mL / g, the acid dissolution temperature is 60-90℃, and the acid dissolution time is 120-130 min.
[0012] Preferably, the blast furnace slag comprises the following components:
[0013] SiO2: 30-40wt%; CaO: 35-45wt%; Al2O3: 7-15wt%; MgO: 6-11wt%.
[0014] Preferably, the SiO2 content in the gel is not less than 65 wt%.
[0015] Preferably, the mixture comprises the following raw materials in parts by weight:
[0016] Gel: 1.98-15 parts;
[0017] Aluminum source: 4.5-7.5 parts;
[0018] Template agent: 0-7.8 parts;
[0019] Alkali source: 0.12-6.5 parts.
[0020] Preferably, the aluminum source is one or a mixture of two or more of sodium aluminate, aluminum isopropoxide, aluminum hydroxide, and boehmite in any proportion.
[0021] Preferably, the template agent is tetrapropylammonium hydroxide; and the alkali source is sodium hydroxide.
[0022] Preferably, the framework topology of the adsorption molecular sieve is one or more of FAU, MFI, CHA, LTA, BEA, and MOR.
[0023] Preferably, the hydrothermal reaction is carried out at a temperature of 80-170°C for a duration of 9-36 hours.
[0024] The adsorption molecular sieve is dried at a temperature of 60-90℃ for 6-12 hours.
[0025] Preferably, the gel is washed, dried, and ground to obtain a particle size of 40-100 mesh.
[0026] On the other hand, this application also proposes the application of the prepared molecular sieve in CO2 adsorption. This application provides a molecular sieve adsorbent for CO2 adsorption, which makes full use of blast furnace slag raw materials to synthesize molecular sieves, solves the pollution problem caused by the large accumulation of blast furnace slag to the soil and water environment, extracts silicon elements from blast furnace slag, makes full use of the potential in blast furnace slag, and generates good economic benefits from blast furnace slag. At the same time, the synthesized molecular sieve is applied in the field of CO2 adsorption and separation, and the prepared molecular sieve exhibits excellent adsorption performance.
[0027] This application can bring the following beneficial effects:
[0028] 1. This application uses the filter residue obtained by acid dissolution of blast furnace slag particles as a gel, and controls the calcium and magnesium content in the gel through raw material control and acid dissolution treatment, so that the obtained molecular sieve has a very good effect in CO2 adsorption.
[0029] 2. This application provides a molecular sieve adsorbent for CO2 adsorption, which fully utilizes blast furnace slag as raw material to synthesize molecular sieves, solving the pollution problem caused by the large-scale accumulation of blast furnace slag to the soil and water environment. It also extracts silicon from the blast furnace slag, fully utilizing its potential and generating good economic benefits. Furthermore, the synthesized molecular sieve exhibits excellent adsorption performance in the field of CO2 adsorption and separation. The molecular sieve prepared using blast furnace slag in this application shows better application prospects in the field of carbon dioxide adsorption and separation compared to other adsorbents.
[0030] 3. This application provides an innovative process for the preparation of molecular sieves, broadens the sources of raw materials for molecular sieve preparation, effectively reduces the preparation cost of molecular sieves, and has good market application prospects.
[0031] 4. This application achieves the recovery of high-value molecular sieves while reducing CO2 emissions, providing a new method for the resource utilization of large amounts of industrial waste residue. Attached Figure Description
[0032] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0033] Figure 1 This is a process flow diagram of the present invention.
[0034] Figure 2 This is a diagram of the product obtained by the present invention.
[0035] Figure 3 The adsorption curve of the adsorbent obtained in Example 1 is shown.
[0036] Figure 4 The adsorption curve of the adsorbent was obtained for Comparative Example 2. Detailed Implementation
[0037] To clearly illustrate the technical features of this solution, the following detailed description, in conjunction with the accompanying drawings, will be provided.
[0038] like Figure 1 As shown, the process flow of this application is as described, and an adsorption molecular sieve prepared using blast furnace slag includes the following steps:
[0039] S1 crushes blast furnace slag to obtain blast furnace slag particles;
[0040] Generally below 100 mesh, the blast furnace slag comprises the following components:
[0041] SiO2: 30-40wt%; CaO: 35-45wt%; Al2O3: 7-15wt%; MgO: 6-11wt%.
[0042] S2 involves acid dissolution of blast furnace slag particles, followed by filtration to obtain filter residue as a gel.
[0043] During acid dissolution, hydrochloric acid is used, with an HCl concentration of 2-6 mol / L. The liquid-solid ratio of hydrochloric acid to blast furnace slag is 12:1 mL / g. The acid dissolution temperature is 60-90℃, and the acid dissolution time is 120-130 min.
[0044] The gel contains 0.8-10.7 wt% CaO and 0.1-1.1 wt% MgO.
[0045] The SiO2 content in the gel is not less than 65 wt%.
[0046] S3 mixes the gel with an aluminum source, a template agent, an alkali source, and water to obtain a mixture;
[0047] The mixture comprises the following raw materials in parts by weight:
[0048] Gel: 1.98-15 parts;
[0049] Aluminum source: 4.5-7.5 parts;
[0050] Template agent: 0.75-7.8 parts;
[0051] Alkali source: 0.12-6.5 parts.
[0052] The aluminum source is one or a mixture of two or more of sodium aluminate, aluminum isopropoxide, aluminum hydroxide, and boehmite in any proportion.
[0053] The template agent is tetrapropylammonium hydroxide; the alkali source is sodium hydroxide.
[0054] S4 involves hydrothermal reaction treatment of the mixture, followed by filtration, washing, and drying to obtain the adsorption molecular sieve.
[0055] The hydrothermal reaction is carried out at a temperature of 80-170℃ for a duration of 9-36 hours.
[0056] The adsorption molecular sieve is dried at a temperature of 60-90℃ for 6-12 hours.
[0057] The framework topology of the adsorption molecular sieve is one or more of FAU, MFI, CHA, LTA, and BEA.
[0058] The gel is washed, dried, and ground to obtain a particle size of 40-100 mesh.
[0059] Applying adsorption molecular sieves to CO2 adsorption.
[0060] Based on the above steps, the following embodiments and comparative examples are provided.
[0061] Example 1
[0062] S101 crushes blast furnace slag to obtain blast furnace slag particles;
[0063] The blast furnace slag comprises the following components:
[0064] <![CDATA[SiO2(wt%)]]> <![CDATA[Al2O3(wt%)]]> CaO (wt%) MgO (wt%) <![CDATA[Fe2O3(wt%)]]> <![CDATA[Na2O(wt%)]]> 38.794 8.465 38.538 10.58 0.28 0.443
[0065] S102 involves acid dissolution of blast furnace slag particles and filtration to obtain filter residue as a gel.
[0066] During acid dissolution, hydrochloric acid was used with an HCl concentration of 2 mol / L and a liquid-to-solid ratio of 12:1 mL / g for hydrochloric acid to blast furnace slag. The acid dissolution temperature was 90℃ and the acid dissolution time was 130 min.
[0067] The contents of each substance in the gel are as follows:
[0068] The gel contains 0.8 wt% CaO, 0.1 wt% MgO, and 95.1 wt% SiO2.
[0069] S103 mixes the gel with an aluminum source, a template agent, an alkali source, and water to obtain a mixture;
[0070] The mixture comprises the following raw materials in parts by weight:
[0071] Gel: 1.98 parts;
[0072] Aluminum source: 4.5 parts;
[0073] Sodium hydroxide: 0.12 parts.
[0074] The aluminum source is sodium aluminate;
[0075] S104 involves hydrothermal reaction treatment of the mixture, followed by filtration, washing, and drying to obtain an adsorption molecular sieve.
[0076] The hydrothermal reaction was carried out at a temperature of 90°C for 6 hours.
[0077] The adsorption molecular sieve was dried at 60°C for 12 hours.
[0078] The gel is washed, dried, and ground to obtain a particle size of 40-100 mesh.
[0079] Its XRD pattern is shown below. Figure 2 (a) Adsorption performance diagram is shown in Figure 3 .
[0080] Example 2
[0081] S201 crushes blast furnace slag to obtain blast furnace slag particles;
[0082] The blast furnace slag comprises the following components:
[0083] <![CDATA[SiO2(wt%)]]> <![CDATA[Al2O3(wt%)]]> CaO (wt%) MgO (wt%) <![CDATA[Fe2O3(wt%)]]> <![CDATA[Na2O(wt%)]]> 38.794 8.465 38.538 10.58 0.28 0.443
[0084] S202 involves acid dissolution of blast furnace slag particles, followed by filtration to obtain filter residue as a gel.
[0085] During the acid dissolution treatment, hydrochloric acid was used, with an HCl concentration of 6 mol / L and a liquid-to-solid ratio of 12:1 mL / g for hydrochloric acid to blast furnace slag. The acid dissolution temperature was 60℃ and the acid dissolution time was 130 min.
[0086] The contents of each substance in the gel are as follows:
[0087] The gel contains 10.7 wt% CaO, 1.1 wt% MgO, and 65.3 wt% SiO2.
[0088] S203 mixes the gel with an aluminum source, a template agent, an alkali source, and water to obtain a mixture;
[0089] The mixture comprises the following raw materials in parts by weight:
[0090] Gel: 15 portions;
[0091] Aluminum source: 7.5 parts;
[0092] Sodium hydroxide: 6.5 parts.
[0093] The aluminum source is sodium aluminate;
[0094] S204 involves hydrothermal reaction treatment of the mixture, followed by filtration, washing, and drying to obtain an adsorption molecular sieve.
[0095] The hydrothermal reaction was carried out at a temperature of 80°C for 8 hours.
[0096] The adsorption molecular sieve was dried at 90°C for 6 hours.
[0097] The gel is washed, dried, and ground to obtain a particle size of 40-100 mesh.
[0098] Example 3
[0099] S301 crushes blast furnace slag to obtain blast furnace slag particles;
[0100] The blast furnace slag comprises the following components:
[0101] <![CDATA[SiO2(wt%)]]> <![CDATA[Al2O3(wt%)]]> CaO (wt%) MgO (wt%) <![CDATA[Fe2O3(wt%)]]> <![CDATA[Na2O(wt%)]]> 38.794 8.465 38.538 10.58 0.28 0.443
[0102] S302 involves acid dissolution of blast furnace slag particles and filtration to obtain filter residue as a gel.
[0103] During acid dissolution, hydrochloric acid was used with an HCl concentration of 2 mol / L and a liquid-to-solid ratio of 12:1 mL / g for hydrochloric acid to blast furnace slag. The acid dissolution temperature was 90℃ and the acid dissolution time was 130 min.
[0104] The contents of each substance in the gel are as follows:
[0105] The gel contains 0.8 wt% CaO, 0.1 wt% MgO, and 95.1 wt% SiO2.
[0106] S303 mixes the gel with an aluminum source, a template agent, an alkali source, and water to obtain a mixture;
[0107] The mixture comprises the following raw materials in parts by weight:
[0108] Gel: 1.98 parts;
[0109] Aluminum source: 4.5 parts;
[0110] Sodium hydroxide: 2.0 parts.
[0111] The aluminum source is sodium aluminate;
[0112] S304 involves hydrothermal reaction treatment of the mixture, followed by filtration, washing, and drying to obtain an adsorption molecular sieve.
[0113] The hydrothermal reaction was carried out at a temperature of 170°C for 48 hours.
[0114] The adsorption molecular sieve was dried at 60°C for 12 hours.
[0115] The gel was washed, dried, and ground to achieve a particle size of 40-100 mesh. Its XRD pattern is shown below. Figure 2 (b)
[0116] Example 4:
[0117] S401 crushes blast furnace slag to obtain blast furnace slag particles;
[0118] The blast furnace slag comprises the following components:
[0119] <![CDATA[SiO2(wt%)]]> <![CDATA[Al2O3(wt%)]]> CaO (wt%) MgO (wt%) <![CDATA[Fe2O3(wt%)]]> <![CDATA[Na2O(wt%)]]> 38.794 8.465 38.538 10.58 0.28 0.443
[0120] S402 involves acid dissolution of blast furnace slag particles, followed by filtration to obtain filter residue as a gel.
[0121] During acid dissolution, hydrochloric acid was used with an HCl concentration of 2 mol / L and a liquid-to-solid ratio of 12:1 mL / g for hydrochloric acid to blast furnace slag. The acid dissolution temperature was 90℃ and the acid dissolution time was 130 min.
[0122] The contents of each substance in the gel are as follows:
[0123] The gel contains 0.8 wt% CaO, 0.1 wt% MgO, and 95.1 wt% SiO2.
[0124] S403 mixes the gel with an aluminum source, a template agent, an alkali source, and water to obtain a mixture;
[0125] The mixture comprises the following raw materials in parts by weight:
[0126] Gel: 1.98 parts;
[0127] Aluminum source: 4.5 parts;
[0128] Tetrapropylammonium hydroxide: 0.75 parts;
[0129] Sodium hydroxide: 2.0 parts.
[0130] The aluminum source is sodium aluminate;
[0131] S404 involves hydrothermal reaction treatment of the mixture, followed by filtration, washing, and drying to obtain an adsorption molecular sieve.
[0132] The hydrothermal reaction was carried out at a temperature of 90°C for 8 hours.
[0133] The adsorption molecular sieve was dried at 60°C for 12 hours.
[0134] The gel is washed, dried, and ground to obtain a particle size of 40-100 mesh.
[0135] Example 5:
[0136] S501 crushes blast furnace slag to obtain blast furnace slag particles;
[0137] The blast furnace slag comprises the following components:
[0138] <![CDATA[SiO2(wt%)]]> <![CDATA[Al2O3(wt%)]]> CaO (wt%) MgO (wt%) <![CDATA[Fe2O3(wt%)]]> <![CDATA[Na2O(wt%)]]> 38.794 8.465 38.538 10.58 0.28 0.443
[0139] S502 involves acid dissolution of blast furnace slag particles and filtration to obtain filter residue as a gel.
[0140] During the acid dissolution treatment, hydrochloric acid was used, with an HCl concentration of 2 mol / L and a liquid-to-solid ratio of 12:1 mL / g for hydrochloric acid to blast furnace slag. The acid dissolution temperature was 80℃ and the acid dissolution time was 130 min.
[0141] The contents of each substance in the gel are as follows:
[0142] The gel contains 0.8 wt% CaO, 0.1 wt% MgO, and 95.1 wt% SiO2.
[0143] S503 mixes the gel with an aluminum source, an alkali source, and water to obtain a mixture;
[0144] The mixture comprises the following raw materials in parts by weight:
[0145] Gel: 6 portions;
[0146] Aluminum source: 0.5 parts;
[0147] Sodium hydroxide: 1.5 parts.
[0148] The aluminum source is sodium aluminate;
[0149] S504 involves hydrothermal reaction treatment of the mixture, followed by filtration, washing, and drying to obtain an adsorption molecular sieve.
[0150] The hydrothermal reaction was carried out at a temperature of 170°C for 24 hours.
[0151] The adsorption molecular sieve was dried at 60°C for 12 hours.
[0152] The gel is washed, dried, and ground to obtain a particle size of 40-100 mesh.
[0153] Comparative Example 1:
[0154] Based on Example 1, the raw material blast furnace slag was replaced with coal gangue, while other conditions remained the same.
[0155] Comparative Example 2:
[0156] Based on Example 4, the S403 gel was replaced with sodium silicate. Its adsorption curve is shown below. Figure 4 .
[0157] Comparative Example 3:
[0158] Based on Example 1, the acid dissolution conditions of S101 were changed to 40°C for 2 hours.
[0159] The CaO content in its gel ranges from 14.2 wt%, the MgO content ranges from 3.1 wt%, and the SiO2 content is 60.7 wt%.
[0160] The adsorption molecular sieves obtained in the above examples and comparative examples were characterized and their CO2 adsorption capacity at 298 K was measured, as shown in the table below:
[0161]
[0162]
[0163] Therefore, heteroatoms can significantly improve the CO2 adsorption capacity of molecular sieves prepared from blast furnace slag. The specific reasons are analyzed below.
[0164] 1. Heteroions alter the molecular sieve framework structure
[0165] Ca 2+ Mg 2+ These can partially replace Si in the molecular sieve framework. 4+ Or Al 3+ This substitution alters the crystal structure and pore characteristics of the molecular sieve, potentially leading to adjustments in the pore size to make it more suitable for CO2 molecule adsorption.
[0166] 2. Hybrid ions enhance surface charge distribution
[0167] Ca 2+ Mg 2+ The introduction of [a specific substance] alters the charge distribution on the molecular sieve surface, enhancing the electrostatic interaction between the molecular sieve and CO2 molecules. CO2 is a polar molecule, and the localized charge inhomogeneity generated by calcium and magnesium ions can enhance the adsorption capacity of CO2.
[0168] 3.Ca 2+ Mg 2+ Enhancing the diversity of adsorption sites, which create different chemical environments within the molecular sieve, increases the diversity of adsorption sites. These sites may have different adsorption affinities for CO2, thereby improving the overall adsorption capacity.
[0169] 4. Impure ions promote chemisorption
[0170] Ca 2+ Mg 2+ It tends to react chemically with CO2 itself, further enhancing the adsorption effect. This chemisorption mechanism significantly improves the CO2 capture efficiency.
[0171] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.
[0172] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
Claims
1. An adsorption molecular sieve prepared using blast furnace slag, characterized in that: Includes the following steps: Blast furnace slag is crushed to obtain blast furnace slag particles; Blast furnace slag particles are acid-dissolved and filtered to obtain filter residue as a gel. The gel is mixed with an aluminum source, a template agent, an alkali source, and water to obtain a mixture. The mixture was subjected to a hydrothermal reaction, and then filtered, washed, and dried to obtain an adsorption molecular sieve. The gel contains 0.8-10.7 wt% CaO and 0.1-1.1 wt% MgO.
2. The adsorption molecular sieve prepared from blast furnace slag according to claim 1, characterized in that: During acid dissolution, hydrochloric acid is used, with an HCl concentration of 2-6 mol / L. The liquid-solid ratio of hydrochloric acid to blast furnace slag is 12:1 mL / g. The acid dissolution temperature is 60-90℃, and the acid dissolution time is 120-130 min.
3. The adsorption molecular sieve prepared from blast furnace slag according to claim 1, characterized in that: The blast furnace slag comprises the following components: SiO2: 30-40wt%; CaO: 35-45wt%; Al2O3: 7-15wt%; MgO: 6-11wt%.
4. The adsorption molecular sieve prepared from blast furnace slag according to claim 1, characterized in that: The SiO2 content in the gel is not less than 65 wt%.
5. The adsorption molecular sieve prepared from blast furnace slag according to claim 1, characterized in that: The mixture comprises the following raw materials in parts by weight: Gel: 1.98-15 parts; Aluminum source: 4.5-7.5 parts; Template agent: 0-7.8 parts; Alkali source: 0.12-6.5 parts.
6. The adsorption molecular sieve prepared from blast furnace slag according to claim 5, characterized in that: The aluminum source is one or a mixture of two or more of sodium aluminate, aluminum isopropoxide, aluminum hydroxide, and boehmite in any proportion. The template agent is tetrapropylammonium hydroxide; the alkali source is sodium hydroxide.
7. The adsorption molecular sieve prepared from blast furnace slag according to claim 5, characterized in that: The framework topology of the adsorption molecular sieve is one or more of FAU, MFI, CHA, LTA, BEA, and MOR.
8. The adsorption molecular sieve prepared from blast furnace slag according to claim 5, characterized in that: The hydrothermal reaction is carried out at a temperature of 80-170℃ for a duration of 9-36 hours. The adsorption molecular sieve is dried at a temperature of 60-90℃ for 6-12 hours.
9. The adsorption molecular sieve prepared from blast furnace slag according to claim 1, characterized in that: The gel is washed, dried, and ground to obtain a particle size of 40-100 mesh.
10. The application of the adsorption molecular sieve according to any one of claims 1-9 in CO2 adsorption.