Sea urchin type aragonite whisker material prepared based on calcium-magnesium-based solid waste regulation and control and method of sea urchin type aragonite whisker material

Abstract

The invention discloses a sea urchin type aragonite whisker material prepared based on calcium-magnesium-based solid waste regulation and a method thereof, and belongs to the technical field of solid waste resource utilization. Through the synergistic effect of the calcium-based solid waste solution and the magnesium-based solid waste solution and under the specific technological parameters (pH = 6.2-7.0, the temperature of 60-90 DEG C, the CO2 concentration of 15-99% and the solid-to-liquid ratio of 1: (10-50), the reaction process is regulated and controlled, and the aragonite whisker material with the unique sea urchin morphology can be stably synthesized. The material is of a special structure in which needle-shaped aragonite whiskers with high length-diameter ratio at the outer part and active silica gel with high polymerization at the inner part coexist. The sea urchin type aragonite whisker material has extremely high specific surface area and pore volume, and shows excellent CO2 curing capacity and reaction activity; meanwhile, when the cement-based material is added as an admixture, the initial setting time can be remarkably shortened.

Description

Technical Field

[0001] This invention belongs to the field of solid waste resource utilization technology, and more specifically relates to a method for preparing sea urchin-type aragonite whisker materials based on calcium-magnesium-based solid waste regulation. Background Technology

[0002] With the increasing generation of calcium- and magnesium-based solid waste, research on the characteristics of the carbonization reaction between calcium-based solid waste and CO2 has emerged. Studies have shown that the carbonization products of calcium-based solid waste and CO2 are polycrystalline calcium carbonate and activated silica gel. However, traditional semi-dry carbonization methods face problems such as difficulty in CO2 diffusion and low carbonization degree. Wet carbonization, on the other hand, can improve the rate and extent of the carbonization reaction. Therefore, wet carbonization has become the mainstream technology for producing polycrystalline calcium carbonate and activated silica gel from calcium-based solid waste.

[0003] Furthermore, while numerous studies have emerged on cement reinforcement materials, most focus on the addition of toughening materials such as plant fibers, carbon fibers, glass fibers, and polyethylene resins. Although these studies improve the flexural strength of cement-based materials, the inherent differences between these admixtures and cement, coupled with their lack of activity, not only create compatibility issues at the fiber-cement interface but also negatively impact the compressive strength of the cement itself. However, with the development of calcium carbonate whisker materials prepared from solid waste, using calcium carbonate whiskers as cement reinforcement materials can effectively solve these problems, making calcium carbonate whisker materials one of the most important cement reinforcement materials.

[0004] Patent application CN118186021A discloses a method for preparing needle-shaped calcium carbonate crystals using microbial mineralization. The method involves impregnating a mineralized matrix material with a Bacillus pasteurization solution, while simultaneously adding a consolidation solution including magnesium chloride, calcium acetate, and urea to prepare aragonite-phase calcium carbonate. Although needle-shaped calcium carbonate is produced, the reaction process is relatively complex, requiring microbial cultivation and a large amount of consolidation solution, resulting in low solidification efficiency. Patent application CN104790024A discloses a method for preparing high aspect ratio aragonite-type calcium carbonate whiskers. This method uses quicklime to prepare a Ca(OH)₂ suspension, followed by the addition of a crystal form regulator to obtain aragonite whiskers with an aspect ratio of 20–25. However, the quicklime used in the reaction requires calcination of CaCO₃ during preparation, which emits a large amount of CO₂, failing to meet the requirements for low-carbon green building materials. Patent application CN118880429A discloses a method for producing high aspect ratio calcium carbonate whiskers by carbon fixation from steel smelting slag leaching solution. The method involves leaching steel slag with an acidic leachate to obtain a calcium-magnesium purified solution. After adjusting the pH to convert magnesium ions into magnesium hydroxide, the solution is placed in an ultrasonic field, and a carbonation solution is added to initiate a carbon fixation reaction. The resulting precipitate is then washed with water and dried to obtain calcium carbonate whiskers. While this patent application achieves the resource utilization of both steel smelting slag and CO2 flue gas, the leaching process generates a large amount of leaching residue as a byproduct, thus not fundamentally solving the steel slag treatment problem.

[0005] Although the aforementioned patent application synthesized aragonite whisker materials, it suffered from problems such as low reaction efficiency, complex process flow, high preparation cost, low reactivity, and the generation of additional by-products.

[0006] Therefore, it is of great significance to develop an aragonite-type whisker material that utilizes all solid waste materials to achieve resource recovery, low carbonization, and high value utilization of calcium-magnesium based solid waste, prepares a highly active sea urchin-like material, and allows aragonite whiskers to coexist with active silica gel with high specific surface area in order to meet the requirements of improved material performance. Summary of the Invention

[0007] The purpose of this invention is to provide a method for preparing sea urchin-shaped aragonite whisker materials based on the regulation of calcium-magnesium-based solid waste, in order to solve the problems existing in the prior art. This invention aims to utilize all solid waste materials to achieve the resource utilization, low carbonization, and high value utilization of calcium-magnesium-based solid waste, and to prepare sea urchin-shaped highly active materials, so that aragonite whiskers and high specific surface area active silica gel can coexist to meet the requirements of improving material performance.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] One of the technical solutions of this invention is to provide a method for preparing sea urchin-type aragonite whisker materials based on calcium-magnesium-based solid waste regulation, comprising the following steps:

[0010] Calcium-based solid waste powder and magnesium-based solid waste solution are mixed to obtain a mixed slurry; the mixed slurry is carbonized to obtain sea urchin-type aragonite whisker material;

[0011] The calcium-based solid waste in the calcium-based solid waste powder includes one or more of the following: papermaking sludge, red mud, carbide slag, steel slag, magnesium slag, circulating fluidized bed fly ash, and waste cement.

[0012] The magnesium-based solid waste in the magnesium-based solid waste solution includes soluble high-magnesium industrial waste residue; the soluble high-magnesium industrial waste residue includes magnesium chloride hydrate.

[0013] Preferably, the main components of the calcium-based solid waste include: 25-65 wt% CaO, 5-40 wt% SiO2, 2-10 wt% MgO, 5-20 wt% Al2O3 and 3-5 wt% Fe2O3.

[0014] Preferably, the main components of the magnesium-based solid waste include: 20-30 wt% MgO and 50-60 wt% Cl. - And 10-20 wt% CaO.

[0015] Preferably, the concentration of the magnesium-based solid waste solution is 0.5–10 wt%.

[0016] Preferably, the mass ratio of the calcium-based solid waste powder to the magnesium-based solid waste solution is 1:10 to 50.

[0017] Preferably, the carbonization process further includes mechanical stirring or ultrasonic dispersion of the mixed slurry; the mechanical stirring speed is 100-600 r / min; and the ultrasonic dispersion power is 300-1000 W.

[0018] Preferably, the carbonization includes: stirring the mixed slurry at 60-90°C, and introducing industrial exhaust gas containing 15-99% CO2 at a flow rate of 100-500 mL / min, while monitoring the pH value of the mixed slurry. When the pH value stabilizes at 6.2-7.0, the gas introduction is stopped, and the carbonization is completed.

[0019] Preferably, the carbonization process further includes steps of filtration, drying, grinding and dispersing the resulting product.

[0020] This invention uses soluble high-magnesium industrial waste (such as magnesium chloride) as the magnesium source, instead of chemically pure MgCl2, providing an ion release environment different from that of chemically pure magnesium salts while ensuring low cost and resource utilization. Through the synergistic effect of calcium-based solid waste and magnesium-based solid waste solutions, and by strictly controlling process parameters (pH = 6.2–7.0, temperature 60–90℃, CO2 concentration 15–99%, solid-liquid ratio 1:10–50) to regulate the reaction process, SiO2 polymerization forms the internal framework, and Mg... 2+ Inducing aragonite nucleation promotes the formation of external needle-like morphology, resulting in a sea urchin structure in which external needle-like structures coexist with internal active silica.

[0021] Comparative experiments have verified that when the temperature drops below 60°C or when there is a lack of magnesium-based waste residue solution (i.e., the concentration of magnesium-based waste residue solution is less than 0.5 wt%), the reaction products are only calcite or irregular particles, and cannot form the sea urchin structure with coexisting external needle-like structures and internal active silica gel as described in this invention.

[0022] The second technical solution of the present invention provides a sea urchin-type aragonite whisker material prepared by the above method, wherein the sea urchin-type aragonite whisker material comprises an inner active silica gel and an outer needle-like aragonite whisker.

[0023] The third technical solution of the present invention is to provide the application of the above-mentioned sea urchin-type aragonite whisker material in the preparation of cement-based materials.

[0024] The present invention discloses the following technical effects:

[0025] (1) Using a complete solid waste system (calcium-based solid waste + magnesium-based solid waste) and CO2-containing industrial tail gas as raw materials, the synergistic consumption of bulk industrial by-products and greenhouse gases has been achieved, significantly reducing production costs and meeting the requirements of green and low-carbon development.

[0026] (2) This invention utilizes the synergistic effect of calcium-based and magnesium-based solid waste solutions, and regulates the reaction process under specific process parameters (pH = 6.2–7.0, temperature 60–90℃, CO2 concentration 15–99%, solid-liquid ratio 1:10–50), to stably synthesize an aragonite whisker material with a unique sea urchin morphology. This material exhibits a special structure where high aspect ratio needle-like aragonite whiskers coexist with highly polymerized active silica gel internally. This composite structure has not been reported in the prior art.

[0027] (3) The sea urchin-type aragonite whisker material has an extremely high specific surface area and pore volume, exhibiting excellent CO2 solidification ability and reactivity; at the same time, when added to cement-based materials as an admixture, it can significantly shorten the initial setting time, which is better than the effect of single calcium-based solid waste or ordinary calcium carbonate whiskers as admixtures. Attached Figure Description

[0028] Figure 1 This is a SEM image of sea urchin-type aragonite whisker material prepared using magnesium slag in Example 1;

[0029] Figure 2 Mercury intrusion porosimetry diagrams of magnesium slag and sea urchin-type aragonite whisker material prepared using magnesium slag in Example 1;

[0030] Figure 3 The FTIR images are for the sample prepared by low-temperature carbonization of magnesium slag in Comparative Example 1 and the FTIR images of the high-polymerization silica gel inside the sea urchin-type aragonite whiskers prepared by magnesium slag in Example 1.

[0031] Figure 4 The initial-final setting time diagrams for magnesium slag and sea urchin-type aragonite whisker material prepared using magnesium slag in Example 1 are shown.

[0032] Figure 5 This is a SEM image of sea urchin-type aragonite whisker material prepared using steel slag in Example 2.

[0033] Figure 6 The FTIR images of the sample prepared using steel slag in Comparative Example 2 and the FTIR images of the sea urchin-type aragonite whiskers prepared using steel slag in Example 2 are shown.

[0034] Figure 7 The initial-final setting time diagrams for steel slag and sea urchin-type aragonite whisker material prepared using steel slag in Example 2 are shown.

[0035] Figure 8 This is a SEM image of sea urchin-type aragonite whisker material prepared using waste cement in Example 3;

[0036] Figure 9 Initial-final setting time diagrams for waste cement and sea urchin-type aragonite whisker material prepared using waste cement in Example 3;

[0037] Figure 10 This is a SEM image of sea urchin-type aragonite whisker material prepared using waste cement in Example 4;

[0038] Figure 11 SEM image of the sample prepared by low-temperature carbonization of magnesium slag for Comparative Example 1.

[0039] Figure 12 SEM image of the sample prepared by ordinary carbonization of steel slag for Comparative Example 2. Detailed Implementation

[0040] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0041] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0042] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0043] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be readily apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0044] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0045] It should be noted that any aspects not described in detail in this invention are conventional practices in the field and are not the focus of this invention.

[0046] Testing revealed that the main components of the magnesium slag, steel slag, waste cement, and magnesium chloride used in the following examples and comparative examples included:

[0047] Magnesium chloride:

[0048] Table 1. Main components and content of magnesium chloride water

[0049] Oxide CaO SiO2 MgO Fe2O3 Al2O3 SO3 Cl Content, wt% 10.31 0.46 28.56 0.15 0.21 0.06 60.25

[0050] Magnesium slag:

[0051] Table 2. Main components and their contents of magnesium slag

[0052] Oxide CaO SiO2 MgO Fe2O3 Al2O3 MnO2 SO3 [K2O] LOI* Content, wt% 54.38 28.43 10.27 2.68 1.78 0.04 0.05 0.02 2.35

[0053] Steel slag:

[0054] Table 3. Main components and content of steel slag

[0055] Oxide CaO SiO2 MgO Fe2O3 Al2O3 MnO2 [K2O] P2O5 LOI* Content, wt% 40.87 18.66 7.54 19.02 5.82 1.12 1.10 3.11 2.76

[0056] Waste cement:

[0057] Table 4. Main components and content of waste cement

[0058] Oxide CaO SiO2 MgO Fe2O3 Al2O3 MnO2 SO3 [K2O] LOI* Content, wt% 49.88 27.09 3.07 3.19 9.66 0.07 2.47 0.65 3.92

[0059] The cement used in the testing process was P·I 42.5 ordinary Portland cement, provided by Fushun Cement Co., Ltd.

[0060] Example 1

[0061] Magnesia slag was ground in a ball mill for 60 minutes and then passed through a 0.075 μm sieve. The sieved magnesium slag was dried at 105 °C for 24 hours to ensure that the physicochemical properties of the waste slag used in each experiment were the same.

[0062] A portion of magnesium slag was weighed and placed in a container, and a 2wt% aqueous solution of magnesium chloride was added, with a mass ratio of magnesium slag to magnesium chloride aqueous solution of 1:20. The temperature was adjusted to 70℃, and a magnetic stirrer was turned on at a speed of 200 r / min to stir the suspension evenly. Simultaneously, industrial exhaust gas with a CO2 concentration of 99% was continuously introduced into the container at a flow rate of 200 mL / min to avoid liquid splashing. The pH value of the suspension was monitored with a pH meter, and the gas flow was stopped when the pH value reached 6.5 and tended to stabilize. Finally, the solid components that had completed carbonization in the suspension were separated by vacuum filtration, dried to a constant weight in an oven, and gently crushed to disperse them for later use.

[0063] The total pore volume and specific surface area of ​​the magnesium slag used in this embodiment and the final product (sea urchin-type aragonite whisker material) are shown in Table 5.

[0064] Table 5 Total pore volume and specific surface area of ​​magnesium slag and the final product

[0065] Total pore volume, mL / g Specific surface area, m 2 / g <!-- 4 -->]]> Magnesium slag 0.6406 1.110 Sea urchin-type aragonite whisker material 3.5248 42.032

[0066] The product (sea urchin-type aragonite whisker material) prepared in this embodiment was subjected to SEM testing to observe its morphology, and the results are as follows. Figure 1 As shown; simultaneously, the specific surface area and pore volume of the sea urchin-type aragonite whisker material were tested using MIP, and the results are as follows. Figure 2 As shown in Table 5; the degree of silica polymerization inside the sea urchin-type aragonite whisker material was tested using FTIR, and the results are as follows. Figure 3 As shown; simultaneously, magnesium slag and sea urchin-type aragonite whiskers were added to cement at dosages of 5 wt%, 10 wt%, and 15 wt%, respectively. The effects of different dosages of magnesium slag and sea urchin-type aragonite whiskers on the standard consistency, initial setting, and final setting of the cement were tested. The results are shown in the figure.Figure 4 As shown.

[0067] Figure 1 The image shows a SEM image of sea urchin-type aragonite whisker material prepared using magnesium slag in Example 1. Figure 2 Mercury intrusion porosimetry diagrams of magnesium slag and sea urchin-type aragonite whisker material prepared using magnesium slag in Example 1. Figure 3 The FTIR images are for the sample prepared by low-temperature carbonization of magnesium slag in Comparative Example 1 and the FTIR images of the high-polymerization silica gel inside the sea urchin-type aragonite whiskers prepared by magnesium slag in Example 1. Figure 4 The initial-final setting time diagrams are for magnesium slag and for sea urchin-type aragonite whisker material prepared using magnesium slag in Example 1. Figure 2 The sea urchin-type aragonite magnesium slag is the sea urchin-type aragonite whisker material prepared by magnesium slag in Example 1. Figure 3 The ordinary carbonization of magnesia slag is the same as the sample prepared by low-temperature carbonization of magnesia slag in Comparative Example 1. The sea urchin-type aragonite crystal material is the sea urchin-type aragonite whisker prepared by magnesia slag in Example 1.

[0068] Depend on Figure 1 It can be seen that under these reaction conditions, sea urchin-type aragonite whisker materials can be generated. Further MIP tests were used to measure the changes in pore volume and specific surface area of ​​the magnesium slag before and after the reaction, such as... Figure 2 As can be seen from Table 5, its pore volume and specific surface area increased significantly, by 450.2% and 3686.7% respectively, indicating that the sea urchin-type aragonite whisker material has a large specific surface area and high reactivity. Figure 3 It can be seen that the sea urchin-type aragonite whisker material is located at 1060 cm⁻¹. -1 and 1150cm -1 Nearby high-polymerization-degree silicon-oxygen network (Q 3 and Q 4 The vibration absorption peak of the silica gel is much larger in percentage area than that of ordinary magnesium carbide slag, indicating that the degree of polymerization of silica gel has been greatly improved and that the interior of the aragonite whisker layer is composed of highly polymerized silica gel. Figure 4 It can be seen that when the sea urchin-type aragonite whisker material and magnesium slag of the present invention are respectively added to cement, the sea urchin-type aragonite whisker material can significantly improve the reaction rate and setting time.

[0069] Example 2

[0070] The steel slag was ground in a ball mill for 60 minutes and then passed through a 0.075 μm sieve. The sieved steel slag was dried at 105 °C for 24 hours to ensure that the physicochemical properties of the waste slag used in each experiment were the same.

[0071] A portion of steel slag was weighed and placed in a container, and a 4 wt% aqueous solution of magnesium chloride was added, with a steel slag to magnesium chloride aqueous solution mass ratio of 1:30. The temperature was adjusted to 90℃, and a magnetic stirrer was turned on at a speed of 400 r / min to uniformly stir the suspension. Simultaneously, industrial exhaust gas with a CO2 concentration of 99% was continuously introduced into the container at a flow rate of 300 mL / min to avoid liquid splashing. The pH value of the suspension was monitored with a pH meter, and aeration was stopped when the pH value reached 6.5 and stabilized. Finally, the solid components that had completed carbonization in the suspension were separated by vacuum filtration, dried to a constant weight in an oven, and gently crushed to disperse them for later use.

[0072] The product (sea urchin-type aragonite whisker material) prepared in this embodiment was subjected to SEM testing to observe its morphology, and the results are as follows. Figure 5 As shown; the FTIR spectra of the urchin-type aragonite whisker material regulated by steel slag and the sample obtained in Comparative Example 2 were analyzed, and the results are as follows. Figure 6 As shown in the figure; steel slag and sea urchin-type aragonite whiskers were added to cement at dosages of 5 wt%, 10 wt%, and 15 wt%, respectively. The changes in standard consistency, initial setting, and final setting of the cement with different dosages of steel slag and sea urchin-type aragonite whiskers were tested. The results are shown in the figure. Figure 7 As shown.

[0073] Figure 5 This is a SEM image of sea urchin-type aragonite whisker material prepared using steel slag in Example 2. Figure 6 The FTIR images of the sample prepared by ordinary carbonization of steel slag in Comparative Example 2 and the FTIR images of the sea urchin-type aragonite whiskers prepared by steel slag in Example 2 are shown. Figure 7 The initial-final setting time diagrams are for steel slag and for the preparation of sea urchin-type aragonite whisker material using steel slag in Example 2.

[0074] Depend on Figure 5 It can be seen that under these reaction conditions, sea urchin-type aragonite whisker materials can be generated. Figure 6 It can be seen that the carburized steel slag regulated by magnesium-based solid waste solution at 854 cm⁻¹ -1 Typical aragonite vibration peaks were observed. In contrast, the carbide steel slag without added magnesium-based solid waste showed a peak at 872 cm⁻¹. -1 The calcite vibration peak was observed. In contrast, the carbide steel slag without added magnesium-based solid waste exhibited a peak at 872 cm⁻¹. -1 The vibration peak of calcite. Figure 7 It can be seen that when the sea urchin-type aragonite whisker material and steel slag of the present invention are respectively added to cement, the sea urchin-type aragonite whisker material can significantly improve the reaction rate and setting time.

[0075] Example 3

[0076] The waste cement test blocks were ground in a ball mill for 60 minutes and then passed through a 0.075 μm sieve. The sieved waste cement powder was dried at 105℃ for 24 hours to ensure that the physical and chemical properties of the waste residue used in each test were the same.

[0077] A portion of waste cement powder was weighed and placed in a container. A 4% magnesium chloride solution was then added, with a mass ratio of waste cement to magnesium chloride solution of 1:40. The temperature was adjusted to 90℃, and a magnetic stirrer was turned on at 200 rpm to thoroughly stir the suspension. Simultaneously, industrial exhaust gas with a CO2 concentration of 15% was continuously introduced into the container at a flow rate of 300 mL / min to prevent splashing. The pH of the suspension was monitored using a pH meter, and aeration was stopped when the pH reached 6.5 and stabilized. Finally, the solid components that had undergone carbonization in the suspension were separated by vacuum filtration and dried in an oven to a constant mass. The solids were then gently crushed to disperse them for later use.

[0078] The product (sea urchin-type aragonite whisker material) prepared in this embodiment was subjected to SEM testing to observe its morphology, and the results are as follows. Figure 8 As shown in the figure; waste cement powder and sea urchin-type aragonite whiskers were added to cement at dosages of 5 wt%, 10 wt%, and 15 wt%, respectively. The changes in standard consistency, initial setting, and final setting of the cement with different dosages of waste cement powder and sea urchin-type aragonite whiskers were tested. The results are shown in the figure. Figure 9 As shown.

[0079] Figure 8 The image shows a SEM image of sea urchin-type aragonite whisker material prepared using waste cement in Example 3. Figure 9 The initial-final setting time diagrams are shown for waste cement and for the preparation of sea urchin-type aragonite whisker material using waste cement in Example 3.

[0080] Depend on Figure 8 It can be seen that under these reaction conditions, sea urchin-type aragonite whisker materials can be generated. Figure 9 It can be seen that when the sea urchin-type aragonite whisker material and waste cement powder of the present invention are respectively added to cement, the sea urchin-type aragonite whisker material can significantly improve the reaction rate and setting time.

[0081] Example 4

[0082] Same as Example 3, except that the dispersion method is ultrasonic dispersion with a power of 200W.

[0083] The product (sea urchin-type aragonite whisker material) prepared in this embodiment was subjected to SEM testing to observe its morphology, and the results are as follows. Figure 10 As shown.

[0084] Figure 10 This is a SEM image of sea urchin-type aragonite whisker material prepared using waste cement in Example 4.

[0085] Depend on Figure 10 It can be seen that the prepared material is urchin-type aragonite whisker material, indicating that the dispersion method does not affect the morphology and crystal form of the product, but it will reduce the whisker size.

[0086] Comparative Example 1

[0087] Same as Example 1, except that the temperature is controlled at 30°C.

[0088] The product prepared in this embodiment was subjected to SEM testing to observe its morphology, and the results are as follows: Figure 11 As shown.

[0089] Figure 11 The image shows a SEM image of a sample prepared by low-temperature carbonization of magnesium slag for Comparative Example 1.

[0090] Depend on Figure 11 It can be seen that the prepared material is calcite-type calcium carbonate.

[0091] Comparative Example 2

[0092] Same as Example 2, except that the concentration of the aqueous magnesium chloride solution was controlled at 0 wt%.

[0093] The product prepared in this embodiment was subjected to SEM testing to observe its morphology, and the results are as follows: Figure 12 As shown.

[0094] Figure 12 SEM image of the sample prepared by ordinary carbonization of steel slag for Comparative Example 2.

[0095] Depend on Figure 12 It can be seen that the prepared material is calcite-type calcium carbonate.

[0096] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0097] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing sea urchin type aragonite whisker material based on calcium magnesium based solid waste regulation, characterized by, The method comprises the following steps: mixing a calcium-based solid waste powder and a magnesium-based solid waste solution to obtain a mixed slurry; and carbonizing the mixed slurry to obtain a sea urchin-type aragonite whisker material; the calcium-based solid waste in the calcium-based solid waste powder comprises one or more of papermaking white mud, red mud, carbide slag, steel slag, magnesium slag, circulating fluidized bed fly ash, and waste cement; the magnesium-based solid waste in the magnesium-based solid waste solution comprises a soluble high-magnesium industrial waste residue; and the soluble high-magnesium industrial waste residue comprises bischofite.

2. The method of claim 1, wherein, main components of the calcium-based solid waste include 25-65 wt% CaO, 5-40 wt% SiO2, 2-10 wt% MgO, 5-20 wt% Al2O3, and 3-5 wt% Fe2O3.

3. The method of claim 1, wherein, The main components of the magnesium-based solid waste include: 20-30 wt% MgO, 50-60 wt% Cl - and 10-20 wt% CaO.

4. The method of claim 1, wherein, the concentration of the magnesium-based solid waste solution is 0.5-10 wt%.

5. The method of claim 1, wherein, the mass ratio of the calcium-based solid waste powder to the magnesium-based solid waste solution is 1:10-50.

6. The method of claim 1, wherein, the carbonization further comprises mechanical stirring or ultrasonic dispersion of the mixed slurry before the carbonization; the mechanical stirring is performed at a rotation speed of 100-600 r / min; and the ultrasonic dispersion is performed at a power of 300-1000 W.

7. The method of claim 1, wherein, the carbonization comprises stirring the mixed slurry at 60-90℃, and introducing industrial tail gas containing CO2 at a concentration of 15-99% at a flow rate of 100-500 mL / min, while monitoring the pH value of the mixed slurry; the carbonization is completed when the pH value is stabilized at 6.2-7.0, and the aeration is stopped.

8. The method of claim 1, wherein, the method further comprises the steps of suction filtration, drying, and grinding and dispersing the obtained product after the carbonization.

9. The sea urchin-like aragonite whisker material prepared by the method of any one of claims 1 to 8, characterized in that, the sea urchin-type aragonite whisker material comprises active silica gel inside and needle-shaped aragonite whiskers outside.

10. Use of the sea urchin-type aragonite whisker material of claim 9 in the preparation of a cement-based material.

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