Red mud-based carbon sequestration concrete energy storage material as well as preparation method and application thereof

Abstract

The invention discloses a red mud-based carbon sealed concrete energy storage material as well as a preparation method and application thereof, and belongs to the technical field of new energy and new materials. According to the invention, industrial waste red mud is used as one of main raw materials, CO2 is converted into stable carbonate through a carbon sequestration technology for storage, a carbon metal framework composite material is introduced, and a cement concrete preparation technology is combined, so that a novel building material with an electricity storage function is formed. According to the invention, effective resource utilization of the red mud is realized, CO2 emission is reduced, a novel energy storage building material is researched and developed, and the energy storage building material has remarkable environmental benefits, economic benefits and application prospects.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy and new materials, and particularly relates to a red mud-based carbon sequestration concrete energy storage material and a preparation method and application thereof. BACKGROUND

[0002] Global climate change has increasingly highlighted its adverse effects on human production and life, and addressing climate change has become one of the most severe challenges facing human society. In recent years, with the rapid development of science and technology, mankind has made significant progress in improving energy utilization efficiency, energy saving and emission reduction, and popularization of green and low-carbon technologies. Among them, carbon sequestration and energy storage technology, as a key technology of energy revolution, is attracting widespread attention worldwide.

[0003] Red mud is the main industrial solid waste discharged after the extraction of alumina from bauxite, which has strong alkalinity, high salinity and complex composition, and mainly includes Bayer red mud, sintered red mud and combined red mud. The red mud yard formed by the existing technology of alumina has mostly reached the upper limit of capacity, and is facing the dilemma of having nowhere to store, which not only restricts the sustainable development of the aluminum industry, but also poses a potential threat to strategic security.

[0004] For energy storage technology, the existing technology usually uses supercapacitors as a new type of high-energy storage device, which is a new type of energy storage device between traditional capacitors and rechargeable batteries, and has advantages such as fast charging and discharging, high power density, ultra-long cycle life and wide working temperature range. It usually includes carbon-based supercapacitors: using activated carbon as the electrode, which has low cost, high specific surface area and large capacity, and is the most widely used; metal oxide supercapacitors: using noble metal oxides (such as ruthenium oxide) as the electrode, which has high energy density but high cost; polymer supercapacitors: using conductive polymers as the electrode, which has high flexibility and processability, each type has unique performance characteristics, and the electrode energy storage material is the core element that determines its performance.

[0005] At the same time, the world is facing the rapid consumption of non-renewable energy, ecological environment destruction, and the limited storage capacity and low conversion efficiency of renewable energy, and urgently needs to develop renewable energy and new energy storage materials and technologies. SUMMARY

[0006] The application aims to provide a red mud-based carbon sequestration concrete energy storage material (RCCM) and a preparation method and application thereof, which solves the problem of comprehensive utilization of red mud and realizes the dual functions of carbon sequestration and electricity storage of cement concrete, and the red mud-based carbon sequestration concrete energy storage material has good electrical conductivity.

[0007] To achieve the above-mentioned purpose, the application provides the following technical solutions: The red mud-based carbon sequestration concrete energy storage material comprises raw materials in the following mass percentages: microorganism carbon fixation red mud 15-28%, carbon metal skeleton composite material 3-7%, cement 8-12%, sand and stone aggregate 37-47%, carbon nanotube 0.03-0.15%, additive 0-4%, and the balance of water.

[0008] Preferably, the carbon metal skeleton composite material preparation method comprises the following steps: The Cu-Ni-Al alloy, the first alkali reagent and the corrosion inhibitor are mixed and reacted to obtain a copper-nickel-aluminum metal skeleton material; The copper-nickel-aluminum metal skeleton material, the carbon source and the second alkali reagent are mixed to obtain the carbon metal skeleton composite material.

[0009] Preferably, the atomic ratio of copper, nickel and aluminum in the Cu-Ni-Al alloy is 2-4:1-3:5-7. The corrosion inhibitor is a composite of sodium molybdate and benzotriazole; the mass ratio of sodium molybdate to benzotriazole is 1:1-3:1.

[0010] Preferably, the specific preparation steps of the microorganism carbon fixation red mud comprise the following steps: The red mud, the Ca(OH)2 solution and water are mixed to obtain a red mud mixture; the water content of the red mud mixture is 25-29%; The bacteria slurry, the red mud mixture and water are mixed to obtain the microorganism carbon fixation red mud; the water content of the carbon fixation red mud is 45-49%.

[0011] Preferably, the carbon nanotube has a tube diameter of 5-20 nm and a length of 1-10 microns.

[0012] Preferably, the cement is Portland cement; and the additive is a polycarboxylate type water reducing agent.

[0013] Preferably, the sand and stone aggregate comprises steel slag coarse aggregate with a mass percentage of 20-50%; and the particle size of the sand and stone aggregate is 1.18-2.36 mm.

[0014] The application further provides a preparation method of the red mud-based carbon sequestration concrete energy storage material. The microorganism carbon fixation red mud, the carbon metal skeleton composite material, the cement and the sand and stone aggregate are mixed to obtain a mixture; The mixture, the additive, the carbon nanotube and water are mixed to obtain a concrete mixture; The concrete mixture is shaped and cured to obtain the red mud-based carbon sequestration concrete energy storage material.

[0015] Preferably, the curing temperature is 20-40 DEG C, the relative humidity is 90-93%, and the time is 28-42 days.

[0016] The application also provides application of the red mud-based carbon sequestration concrete energy storage material in the technical solution or the red mud-based carbon sequestration concrete energy storage material prepared by the preparation method in the double fields of concrete carbon sequestration and electricity storage.

[0017] The application provides a red mud-based carbon sequestration concrete energy storage material, which comprises the following raw materials in percentage by mass: microbial carbon fixation red mud 15-28%, carbon metal skeleton composite material 3-7%, cement 8-12%, sand and stone aggregate 37-47%, carbon nanotube 0.03-0.15%, additive 0-4%, and the balance of water. In the process of cement hydration, the carbon metal skeleton, the microbial carbon fixation red mud and water form a series of interconnected micro-pores in the system, the carbon metal skeleton is uniformly and widely fixed in the spatial structure of the concrete, and a macro-scale carbon metal conductive network and an ion channel are formed in the hardened concrete. The carbon nanotube doped further extends and encrypts the conductive system at the micro and nano scales, and the secondary network structure formed by the dispersion of the carbon nanotube in the cement stone matrix and the pores effectively bridges the gaps between the macro carbon metal skeletons, and constitutes a fractal conductive framework with multi-level communication of “macro-micro-nano”. The structure greatly increases the effective conductive inner surface area of the material.

[0018] Meanwhile, the red mud itself has good water retention characteristics and rich soluble alkali, and a stable saturated electrolyte environment is formed in the micro pores of the concrete, which creates conditions for a large number of electric double layer charges to accumulate on the surface of the multi-level conductive network. In addition, the transition metal oxides (such as Fe2O3 and MnO2) in the red mud act as electrode active materials, which cooperates with the carbon nanotube and the carbon metal skeleton to provide significant Faraday pseudo-capacitance for the system. The introduction of the carbon nanotube not only optimizes the charge transmission path and reduces the overall resistance, but also directly contributes to considerable double-layer capacitance due to its large specific surface area. Finally, the red mud-based concrete material (RCCM) has excellent double-layer capacitance and Faraday pseudo-capacitance characteristics, and becomes a high-performance supercapacitor material. The application perfectly balances the electrochemical performance, mechanical properties and construction cost of the material, and shows great potential in the field of large-scale energy storage.

[0019] Further, the application also provides a preparation method of the microbial carbon fixation red mud. Under curing conditions, CO2 produced by urease secreted by microorganisms to decompose urea is distributed in the pores of the red mud, so that the CO2 is fully contacted with the red mud to realize the full contact reaction of the CO2 and the red mud, and the CO2 is converted into CO3 2- , CO3 2- and free Ca2+ The calcium carbonate insoluble substance is combined. Through this step, the effective storage and utilization of CO2 are realized while reducing the risk of calcium vanadate or gypsum plugging the pore structure of concrete in the RCCM structure. The carbon sequestration red mud raw material meeting the production requirements of cement concrete is obtained.

[0020] Compared with the prior art, the present application has the following technical effects: 1. Resource utilization of red mud: The present application takes red mud as one of the main raw materials, providing an effective way for efficient resource utilization of red mud, reducing the production cost of materials, and reducing environmental pollution.

[0021] 2. Effective CO2 storage: The strong alkalinity of red mud is fully utilized, and specific processes are used to make CO2 fully contact with red mud to convert CO2 into carbonate insoluble substance and store it in carbon sequestration red mud. Thus, permanent storage and utilization of CO2 are realized.

[0022] 3. Low-cost energy storage material: As a large industrial solid waste, red mud is rich in soluble alkali (NaCl, NaOH, NaHCO3, etc.) and has high water holding characteristics, forming an excellent electrolyte in the pore of concrete. Red mud, cement, sand or graphite are all low-cost and easily available raw materials, providing cost advantages for large-scale preparation and utilization of RCCM.

[0023] 4. Green new building material: Red mud-based carbon sequestration concrete is a low-cost new type of concrete building material with good physical and mechanical properties and durability, meeting the needs of various road and building engineering. Not only does it realize the disposal of large solid waste and the storage and utilization of CO2, but also provides a new choice for the multifunctionalization of future building structures. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The scanning electron microscope image of the microbial carbon sequestration red mud prepared in Example 1 of the present application; Figure 2 The scanning electron microscope image of the carbon metal skeleton composite material prepared in Example 1 of the present application. DETAILED DESCRIPTION

[0026] The application provides a red mud-based carbon sequestration concrete energy storage material, which comprises the following raw materials in percentage by mass: 15-28% of microbial carbon fixation red mud, 3-7% of carbon metal skeleton composite material, 8-12% of cement, 37-47% of sand and stone aggregate, 0.03-0.15% of carbon nanotube, 0-4% of additive, and the balance of water.

[0027] In the application, all the preparation raw materials are commercially available products known to those skilled in the art, unless otherwise specified.

[0028] In the application, the raw materials of the red mud-based carbon sequestration concrete energy storage material comprise 15-28% of microbial carbon fixation red mud in percentage by mass, which can be 20% or 22.2% in specific embodiments.

[0029] In the application, the specific preparation steps of the microbial carbon fixation red mud comprise: mixing the red mud, the Ca(OH)2 solution and water to obtain a red mud mixture; the water content of the red mud mixture is 25-29%; mixing the bacterial slurry, the red mud mixture and water to obtain the microbial carbon fixation red mud; the water content of the carbon fixation red mud is 45-49%.

[0030] In the application, the concentration of the Ca(OH)2 solution is 1.2-1.5 g / mL; the mass ratio of the red mud to Ca(OH)2 is 1:3.6-7.5. The red mud before use further comprises drying, crushing and screening the red mud in sequence; the screening is through a 2-3 mm screen. In the application, the Ca(OH)2 solution provides an alkaline environment on one hand and supplements free Ca 2+ on the other hand, and the free hydroxyl ions released from the Ca(OH)2 solution also have a carbon fixation effect.

[0031] In the application, the bacterial slurry is obtained by inoculating a microbial agent into a sterilized nutrient solution and culturing; the microbial agent is Bacillus pasteurii; the nutrient solution is obtained by mixing urea, sodium chloride, soybean peptone, tryptone and deionized water; the concentration of urea in the nutrient solution is 0.01-0.02 g / mL, the concentration of sodium chloride is 0.005-0.01 g / mL, the concentration of soybean peptone is 0.005-0.01 g / mL, and the concentration of tryptone is 0.01-0.02 g / mL; the volume ratio of the microbial agent to the nutrient solution is 1:8-10; the nutrient solution is sterilized by high pressure before use; the high pressure sterilization is performed at 121-140 DEG C for 60-80 min.

[0032] In the present application, the culture conditions are as follows: culturing at 30-35 DEG C, 100-120 r / min for 20-24 h, and in specific embodiments, culturing at 30 DEG C, 120 r / min for 20 h In the present application, the culture is further followed by centrifugal treatment of the obtained system, removing the supernatant of the centrifugal tube, and obtaining the microbial slurry at the bottom of the centrifugal tube; the centrifugal treatment conditions are as follows: centrifuging at a speed of 3000-4000 r / min for 20-30 min.

[0033] In the present application, the mass ratio of the microbial slurry and the red mud mixture is 1:1.25-1.5.

[0034] In the present application, the raw material of the red mud-based carbon sequestration concrete energy storage material comprises 3-7% of the carbon metal skeleton composite material by mass fraction, and in specific embodiments, it can be 3.2%, 4% or 5%.

[0035] In the present application, the specific preparation steps of the carbon metal skeleton composite material comprise: mixing and reacting Cu-Ni-Al alloy, a first alkali reagent and an inhibitor to obtain a copper-nickel-aluminum metal skeleton material; mixing the copper-nickel-aluminum metal skeleton material, graphite and a second alkali reagent to obtain a carbon metal skeleton composite material.

[0036] In the present application, the atomic ratio of copper, nickel and aluminum in the Cu-Ni-Al alloy is 2-4:1-3:5-7; the particle size of the Cu-Ni-Al alloy is 200-600 mesh; the Cu-Ni-Al alloy is obtained by melting and stirring the Cu-Ni-Al alloy ingot under an inert gas atmosphere, naturally cooling to room temperature, and then crushing; the inert gas is argon; the melting temperature is 1600-1700 DEG C, and the time is 30-40 min; the stirring rate is 300-350 r / min, and the stirring time is 10-20 min.

[0037] In the present application, the first alkali reagent is NaOH solution, KOH solution or Ca(OH)2 solution, and in specific embodiments, it can be NaOH solution; the concentration of the NaOH solution is 9.0-11.0 mol / L; the dosage ratio of the Cu-Ni-Al alloy and the first NaOH solution is 1 g:30-40 mL; the mass ratio of the Cu-Ni-Al alloy and the inhibitor is 1:0.8-1.0; the inhibitor is a composite of sodium molybdate and benzotriazole, and the mass ratio of sodium molybdate and benzotriazole is 1:1-3:1.

[0038] In the present application, the reaction time is 60-120 min, and the temperature is 25-30 DEG C; the reaction is followed by water washing. In the present application, Cu-Ni-Al alloy powder is reacted with sodium hydroxide solution at room temperature in an open environment, the dissolution of copper and nickel is inhibited by adding a composite corrosion inhibitor, and the aluminum in the alloy is selectively dissolved away, forming a multi-stage porous metal framework structure rich in copper and nickel active sites, thereby forming a favorable structure for ion rapid transmission and storage, providing ion transmission channels and storage sites. Finally, the modified product is washed with deionized water to obtain a nanoscale copper-nickel metal framework with excellent performance.

[0039] In the present application, the carbon source is graphite; the second alkali reagent is NaOH solution, KOH solution or Ca(OH)2 solution, which can be NaOH solution in specific embodiments; the concentration of the NaOH solution is 4-7 mol / L; the use amount ratio of the copper-nickel-aluminum metal framework material, the carbon source and the second NaOH solution is 5-7 g:1-3 g:100-110 mL.

[0040] In the present application, after mixing the copper-nickel-aluminum metal framework material, the carbon source and the second alkali reagent, the resulting product is further subjected to ball milling, washing, centrifugation and drying; the ball milling conditions are as follows: the ball-to-material ratio is 8-10:1, the rotation speed is 350-400 rpm, and the ball milling time is 10-14 h; during the ball milling, every 30 min of ball milling is followed by a 10 min pause; the present application does not have special limitations on the washing, centrifugation and drying conditions, and the skilled person in the art can use the methods well known in the art. In the present application, the copper-nickel-aluminum metal framework material is mixed with the carbon source graphite and subjected to ball milling, at which time physical intercalation and chemical reaction occur between the copper-nickel metal framework and the carbon source graphite, enabling the graphite to intercalate or adhere to the surface and pores of the metal framework. After the steps of washing, centrifugation and drying, a carbon-metal framework composite material with special conductive energy storage performance is obtained.

[0041] In the present application, the raw materials of the red mud-based carbon sequestration concrete energy storage material include cement 8-12% by mass fraction, which can be 9% or 10% in specific embodiments; the cement is Portland cement, which can be P.O. 42.5 cement in specific embodiments; In the present application, the raw materials of the red mud-based carbon sequestration concrete energy storage material include sand and gravel aggregate 37-47% by mass fraction, which can be 37.6%, 38.9%, 40.8% or 45% in specific embodiments; the sand and gravel aggregate is natural sand and gravel aggregate or sand and gravel aggregate containing 20-50% of steel slag coarse aggregate by mass fraction; the particle size of the natural sand and gravel aggregate is 1.18-1.2.36 mm, and the particle size of the steel slag coarse aggregate is 1.18-2.36 mm.

[0042] In the present application, the raw materials of the red mud-based carbon sequestration concrete energy storage material include 0.03-0.15% of carbon nanotubes by mass fraction, which can be 0.05 or 0.1% in specific embodiments; the carbon nanotubes have a tube diameter of 5-20 nm and a length of 1-10 μm.

[0043] In the present application, the raw materials of the red mud-based carbon sequestration concrete energy storage material include 0-4% of additives by mass fraction, which can be 0.16%, 0.4%, 1.0%, 1.5% or 3.2% in specific embodiments; the additives are polycarboxylic water-reducing agents, which can be polycarboxylic PCA-1 high-performance water-reducing agents in specific embodiments.

[0044] The present application also provides a preparation method of the red mud-based carbon sequestration concrete energy storage material according to the above technical solution, which includes the following steps: The microbial carbon fixation red mud, carbon metal skeleton composite material, cement and sand and gravel aggregate are mixed to obtain a mixture; The mixture, additives, carbon nanotubes and water are mixed to obtain a concrete mixture; The concrete mixture is shaped and cured to obtain the red mud-based carbon sequestration concrete energy storage material.

[0045] In the present application, the shaping is vibration shaping; the curing temperature is 20-40℃, the relative humidity is 90-93%, and the time is 28-42 d.

[0046] The present application also provides an application of the red mud-based carbon sequestration concrete energy storage material according to the above technical solution or the red mud-based carbon sequestration concrete energy storage material prepared by the preparation method according to the above technical solution in the fields of concrete carbon sequestration and electricity storage.

[0047] In order to further illustrate the present application, the red mud-based carbon sequestration concrete energy storage material, the preparation method and the application provided by the present application are described in detail below in combination with the drawings and examples, but they should not be understood as limiting the scope of protection of the present application.

[0048] Example 1 S1, Preparation of microbial carbon fixation red mud: 1) The red mud is dried, crushed and sieved through a 2 mm sieve to obtain a red mud powder; the red mud powder and a Ca(OH)2 solution (1.2 mol / L) are mixed in a dosage ratio of 1 g:3 mL, and water is added to obtain a red mud mixture with a water content of 29%; 2) Urea, solid sodium chloride, soybean peptone, tryptone and deionized water are mixed in a ratio of 20 g:5 g:5 g:15 g:1000 mL to obtain a nutrient solution, the obtained nutrient solution is sterilized at 121 DEG C for 70 min, then the Pasteur Bacillus is inoculated into the nutrient solution subjected to high pressure sterilization (the volume ratio of Pasteur Bacillus to nutrient solution is 1:8), and cultured at 30 DEG C and 120 r / min for 20 h, after the culture is completed, centrifugation is performed at a speed of 4000 r / min for 20 min, the supernatant of the centrifuge tube is removed, and the microbial slurry in the bottom of the centrifuge tube is obtained; 3) The microbial slurry is mixed with the red mud mixture in a mass ratio of 1:1.25, water is added to adjust the moisture content, and the carbon fixation red mud with a moisture content of 45% is obtained.

[0049] Figure 1 The scanning electron microscope image of the microbial carbon fixation red mud prepared in Example 1 of the present application is shown in the following figure: Figure 1 It can be seen that the carbonate deposits such as calcium carbonate induced by microorganisms are distributed in the microbial carbon fixation red mud in the form of clumps, and the size is within three microns, which indicates that the microorganisms effectively promote the absorption of carbon dioxide and form a dense microporous system.

[0050] S2, Preparation of carbon-metal skeleton composite material: 1) Preparation of copper metal skeleton material: Cu-Ni-Al alloy with an atomic ratio of copper, nickel and aluminum of 3:2:5 is fully melted (temperature 1700 DEG C, time 40 min) and stirred (stirring rate 350 r / min, stirring time 20 min) under argon atmosphere, and then naturally cooled to room temperature, crushed, and Cu-Ni-Al alloy powder with a particle size of 200-600 mesh is obtained; the Cu-Ni-Al alloy powder, NaOH solution and molybdate-benzotriazole composite corrosion inhibitor (mass ratio 1:1) are mixed in a ratio of 1 g:30 mL:0.8 g and reacted at room temperature for 120 min, and then washed with deionized water to obtain a copper-nickel-aluminum metal skeleton material; 2) Preparation of carbon-metal skeleton composite material: The copper-nickel-aluminum metal skeleton material, graphite and 4 mol / L NaOH solution are mixed in a ratio of 7 g:3 g:110 mL, ball milled (ball-to-material ratio 10:1, rotation speed 350 rpm, ball milling time 14 h; during ball milling, pause for 10 min every 30 min of ball milling), washed, centrifuged and dried to obtain a carbon-metal skeleton composite material.

[0051] Figure 2 The scanning electron microscope image of the carbon-metal skeleton composite material prepared in Example 1 of the present application is shown in the following figure: Figure 2It can be seen that the interface of the metal skeleton presents a dense feature, and particles or block structures of different sizes can be observed, showing good strength durability performance, and showing the application potential of the metal skeleton to improve the strength of the material.

[0052] S3, Preparation of the red mud-based carbon sequestration concrete energy storage material: 1) According to Table 1, the raw materials were weighed, and the microbial carbon sequestration red mud, carbon metal skeleton composite material, P.O. 42.5 cement and composite aggregate (composed of natural aggregate with a particle size of 1.18-1.25 mm and steel slag coarse aggregate with a particle size of 1.18-2.36 mm at a mass ratio of 4:1) were mixed to obtain a mixture (each experiment was repeated 3 groups); 2) The obtained mixture was added with polycarboxylic acid PCA-1 high-performance water reducing agent and carbon nanotubes (tube diameter of 5-20 nm, length of 1-10 μm), and then water was added to obtain a concrete mixture; 3) The concrete mixture was sent into a mixer for stirring, and then poured into a 10 cm x 10 cm x 2 cm mold for vibration forming. After 24 h of molding, the mold was removed, and the red mud-based carbon sequestration concrete energy storage material was obtained after 28 days of curing under the conditions of temperature 20℃ and relative humidity 90%.

[0053] Table 1 Dosage ratio of each raw material in the red mud-based carbon sequestration concrete energy storage material (g)

[0054] Comparative Example 1 Prepared according to the group 1 ratio of Example 1, the difference is that the preparation method of the copper metal skeleton material is: 1) Alloy preparation: prepare a copper-magnesium alloy with a copper to magnesium atomic ratio of 33:47, arc melt in an argon environment, and cast into a rod-shaped ingot with a diameter of 10 mm; 2) Dealloying treatment: immerse the rod-shaped ingot in a 5wt.% HCl solution at room temperature, then heat to 90℃, dealloying treatment for 20h (until no bubbles), wash with distilled water and anhydrous ethanol, and store in vacuum to prevent oxidation, to obtain the copper metal skeleton material.

[0055] This method is time-consuming and low in efficiency, compared with the preparation method of the copper metal skeleton material provided in Example 1 of the present application, which has the advantages of low cost and easy operation.

[0056] Comparative Example 2 Prepared according to the group 1 ratio of Example 1, the difference is that the water content of the red mud mixture is adjusted to 39%.

[0057] Comparative Example 3 Prepared according to the group 1 ratio of Example 1, the difference is that the water content of the carbon sequestration red mud is adjusted to 40%.

[0058] Comparative Example 4 Prepared according to the proportion of Example 1 Group 1, except that the carbon metal skeleton composite material in S3 step is replaced with the copper metal skeleton material of S2 step in equal mass.

[0059] Comparative Example 5 Prepared according to the proportion of Example 1 Group 1, except that the carbon metal skeleton composite material in S3 step is replaced with the copper metal skeleton material of S2 step in equal mass.

[0060] Test Example 1 Mechanical property and carbon sequestration performance test: The red mud-based carbon sequestration concrete energy storage materials prepared in Example 1 and the materials prepared in Comparative Examples 1-5 are prepared into test pieces according to GB / T50081, and after 28 days of curing, the compressive strength is tested using a hydraulic universal testing machine under the condition that the loading rate is controlled at 0.5-1.0 MPa / s; the concrete materials are crushed and placed in a carbonation box with a CO2 concentration of 20%, a temperature of 25°C, and a relative humidity of 60%, and after 28 days of continuous exposure (reference ASTM C1505), the CO2 absorption amount is measured by TGA, and the results are shown in Table 2.

[0061] Table 2 Performance test results of red mud-based carbon sequestration concrete energy storage materials of each group in Example 1

[0062] As can be seen from Table 2, the compressive strength of the red mud-based carbon sequestration concrete energy storage materials prepared by the method of Example 1 of the present application can reach more than 30 MPa; the measured carbon sequestration capacity is more than 23 kg of carbon dioxide per ton of material.

[0063] Test Example 2 Energy storage performance test: The red mud-based carbon sequestration concrete energy storage materials prepared in Example 1 and the materials prepared in Comparative Examples 1-5 are measured for their resistance and capacitance values using an LCR bridge. The materials are subjected to multiple charge and discharge cycles using a cyclic voltammetry (CV) charge and discharge tester, and the cycle number and performance decay are recorded to evaluate their energy storage capacity.

[0064] Table 2 Performance test results of red mud-based carbon sequestration concrete energy storage materials of each group in Example 1

[0065] Although the above examples have made a detailed description of the present application, it is only a part of the embodiments of the present application, not all the embodiments, and other embodiments can be obtained from the present embodiments without creativity, which are within the scope of protection of the present application.

Claims

1. A red mud-based carbon sequestration concrete energy storage material, characterized in that, The raw materials include the following percentages by weight: 15-28% microbial carbon-fixing red mud, 3-7% carbon metal skeleton composite material, 8-12% cement, 37-47% sand and gravel aggregate, 0.03-0.15% carbon nanotubes, 0-4% additives, and the balance water.

2. The red mud-based carbon sequestration concrete energy storage material according to claim 1, characterized in that, The method for preparing the carbon metal skeleton composite material includes: A copper-nickel-aluminum metal framework material is obtained by mixing and reacting Cu-Ni-Al alloy, first alkali reagent and corrosion inhibitor; The copper-nickel-aluminum metal skeleton material, carbon source, and second alkali reagent are mixed to obtain a carbon metal skeleton composite material.

3. The red mud-based carbon sequestration concrete energy storage material according to claim 2, characterized in that, The atomic ratio of copper, nickel and aluminum in the Cu-Ni-Al alloy is 2~4:1~3:5~7; The corrosion inhibitor is a complex of sodium molybdate and benzotriazole; the mass ratio of sodium molybdate to benzotriazole is 1:1 to 3:

1.

4. The red mud-based carbon sequestration concrete energy storage material according to claim 1, characterized in that, The specific preparation steps of the microbial carbon-fixing red mud include: Red mud, Ca(OH)₂ solution, and water were mixed to obtain a red mud mixture; the water content of the red mud mixture was 25-29%. The microbial carbon-fixing red mud is obtained by mixing the bacterial mud, red mud mixture, and water; the water content of the carbon-fixing red mud is 45-49%.

5. The red mud-based carbon sequestration concrete energy storage material according to claim 1, characterized in that, The carbon nanotubes have a diameter of 5-20 nm and a length of 1-10 μm.

6. The red mud-based carbon sequestration concrete energy storage material according to claim 1, characterized in that, The cement is silicate cement; the additive is a polycarboxylate superplasticizer.

7. The red mud-based carbon sequestration concrete energy storage material according to claim 1, characterized in that, The sand and gravel aggregate includes steel slag coarse aggregate with a mass ratio of 20-50%; the particle size of the sand and gravel aggregate is 1.18-2.36 mm.

8. A method for preparing the red mud-based carbon sequestration concrete energy storage material according to any one of claims 1 to 7, characterized in that, Includes the following steps: Microbial carbon-fixing red mud, carbon metal skeleton composite materials, cement and sand and gravel aggregates are mixed to obtain a mixture; The mixture, additives, carbon nanotubes and water are mixed to obtain a concrete mixture. The concrete mixture is molded and cured to obtain a red mud-based carbon sequestration concrete energy storage material.

9. The preparation method according to claim 8, characterized in that, The curing temperature is 20~40℃, the relative humidity is 90~93%, and the time is 28~42 days.

10. The application of the red mud-based carbon sequestration concrete energy storage material according to any one of claims 1 to 7 or the red mud-based carbon sequestration concrete energy storage material prepared by the preparation method according to any one of claims 8 to 9 in both the fields of concrete carbon sequestration and energy storage.

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