Vaterite type stable artificial aggregate prepared by synergistically using pomegranate rind and steel slag

Abstract

The invention belongs to the technical field of industrial solid waste resource utilization and building materials, and relates to a vaterite type stable artificial aggregate prepared by pomegranate peel-steel slag synergistically, a preparation method of the vaterite type stable artificial aggregate comprises the following steps: extracting dry pomegranate peel by adopting a hydrothermal method to obtain a pomegranate peel extract; mixing steel slag powder, cement, fly ash and the pomegranate peel extract to obtain a mixed raw material, and carrying out water spraying granulation to obtain aggregate; standing the aggregate for primary maintenance; and placing the primarily cured aggregate in a carbonization box, filling carbon dioxide, and carrying out carbonation treatment and secondary curing to obtain the vaterite type stable artificial aggregate. The pomegranate peel extract is used as a green crystal regulating agent, a large amount of vaterite in the steel slag is induced to be generated through carbonation curing, the problems that in a traditional technology, calcite crystal form carbonization efficiency is low, and the volume stability is poor are solved, and the obtained aggregate can be used for concrete aggregate and underground filling materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial solid waste resource utilization and building materials, and particularly relates to a ballite type stable artificial aggregate prepared by synergistically using pomegranate peel and steel slag. BACKGROUND

[0002] With the rapid development of global industrialization, the amount of industrial solid waste is increasing dramatically. Its storage and disposal not only occupies a large amount of land resources, but also can cause serious pollution to the soil, water and atmospheric environment. Among the many industrial solid wastes, steel slag, as the main by-product of the steel production process, has a huge annual output, but the comprehensive utilization rate has been at a low level. A large amount of steel slag is usually treated by open-air storage or landfill, which not only causes waste of resources, but also brings serious environmental challenges. Therefore, developing efficient and high-value-added steel slag resource utilization technology to realize "waste to treasure" is the key to promoting the green and sustainable development of the steel industry, and it is in line with the national development strategy of circular economy.

[0003] Steel slag, as a by-product of the steelmaking process, is in large quantities. If not disposed of properly, it not only occupies land resources, but also can pollute the environment. According to statistics, the steel slag production in China in 2020 reached 160 million tons, but 70% of the steel slag has not been reasonably utilized, and the management of steel slag utilization is a heavy task. By converting recycled steel slag into concrete aggregate and applying it to the construction industry, not only can the comprehensive utilization rate of waste steel slag be significantly improved, but also the problem of tight resources of sand and gravel aggregate faced by the building material industry can be effectively alleviated. However, in actual operation, steel slag contains free calcium oxide (f-CaO) and free magnesium oxide (f-MgO), which will react to generate calcium hydroxide and magnesium hydroxide under hydration environment, accompanied by significant volume expansion (more than 1.5 times). This delayed expansion can cause cracking, bulging and even destruction of concrete products made from steel slag aggregate, which seriously restricts its safe application in construction engineering. Traditional physical or chemical methods (such as aging, steam treatment or adding additives) to stabilize steel slag often have problems such as long treatment period, high cost or unsatisfactory effect. Therefore, seeking a new stabilization technology that can efficiently and completely convert unstable components in steel slag into stable phases is the core to break through the bottleneck of its resource utilization application.

[0004] Carbonation curing is a promising technology for carbon sequestration and waste stabilization. The basic principle is to use carbon dioxide (CO2) to react with active calcium and magnesium minerals (such as f-CaO, f-MgO, and calcium silicate) in steel slag to form calcium carbonate (CaCO3) and magnesium carbonate (MgCO3). This reaction not only permanently sequesters CO2, achieving carbon emission reduction, but more importantly, the reaction product, carbonate, is more compact and stable in volume than the reactants, effectively eliminating the volume expansion problem caused by f-CaO and f-MgO, thus achieving complete stabilization of steel slag. Calcium carbonate exists in three main crystal forms: calcite, aragonite, and vaterite. Among them, vaterite is a metastable form of calcium carbonate. Studies have shown that vaterite has a large specific surface area, high solubility, and good biocompatibility. The formation of vaterite during carbonation means that the reaction product has a more optimized microstructure and higher reactivity, which is particularly advantageous for the preparation of functional materials (such as artificial aggregates). However, under conventional carbonation conditions, vaterite is easily converted to calcite, which is more thermodynamically stable. Therefore, one of the current research focuses in this field is to induce and stabilize the formation of vaterite by adjusting the reaction conditions.

[0005] In the prior art, patent publication number CN 117142508 A uses ammonium chloride leaching-carbonation method to prepare vaterite, but chemical additives are required; patent publication number CN 119569402 A uses ammonium citrate and polystyrene sulfonate to regulate vaterite, but the cost is high and the environmental friendliness is insufficient; patent publication number CN 114436306 A uses polyacrylic acid and ultrasonic waves, but the energy consumption is high and the process is complex. Pomegranate peel, as a common agricultural waste, is rich in tannic acid, gallic acid and other polyphenols. These polyphenols have multiple phenolic hydroxyl groups, which can strongly chelate with calcium ions (Ca 2+ ) and act as effective organic templates or inhibitors during calcium carbonate crystallization. SUMMARY

[0006] The purpose of the present application is to provide a green and low-cost method for regulating the steel slag carbonation process using pomegranate peel extract, inducing the formation of vaterite and inhibiting its conversion to calcite, and preparing a high-stability, high-strength, and high-carbon sequestration rate steel slag artificial aggregate that solves the problem of volume expansion and realizes the collaborative resource utilization of steel slag and pomegranate peel.

[0007] In order to achieve the above-mentioned purpose of the application, the present application provides the following technical solutions: The present application provides a method for preparing vaterite-type stable artificial aggregate by pomegranate peel-steel slag collaboration, comprising the following steps: (1) Extracting dry pomegranate peel using a hydrothermal method to obtain pomegranate peel extract; (2) mixing steel slag powder, cement, fly ash and pomegranate peel extract to obtain mixed raw materials, and spraying water on the mixed raw materials to obtain aggregates; (3) allowing the aggregates to stand for primary curing; (4) placing the aggregates after primary curing in a carbonation box and filling carbon dioxide to perform carbonation treatment; (5) allowing the aggregates after carbonation treatment to stand for secondary curing, thereby obtaining the stable artificial aggregate of vaterite.

[0008] Preferably, the temperature in step (1) is 60-100 DEG C, and the extraction time is 3-6 h.

[0009] Preferably, the mass ratio of steel slag powder, cement and fly ash in step (2) is 13-15:4-6:1. The mass of pomegranate peel extract in step (2) is 5-10% of the mass of steel slag powder.

[0010] Preferably, the mass ratio of mixed raw materials and water in water spraying in step (2) is 0.15-0.25:1. The particle size of the aggregates in step (2) is 5-20 mm.

[0011] Preferably, the temperature in primary curing in step (3) is 15-25 DEG C, the relative humidity in primary curing is 50-60%, and the primary curing time is 48-96 h.

[0012] Preferably, the concentration of carbon dioxide in step (4) is 20-99.9%. The carbonation treatment temperature in step (4) is 15-25 DEG C, the carbonation treatment time is 12-48 h, and the carbonation treatment pressure is 0.05-0.3 MPa.

[0013] Preferably, the temperature in secondary curing in step (5) is 15-25 DEG C, the relative humidity in secondary curing is ≥90%, and the secondary curing time is 7-28 days.

[0014] The application further provides a stable artificial aggregate of vaterite prepared by the method.

[0015] The application has the following beneficial effects: (1) Pomegranate peel polyphenols can significantly improve the purity of vaterite (≥80%) by chelating Ca 2+ and adsorbing crystal faces, and inhibit the conversion of calcite.

[0016] (2) The porous structure of the vaterite promotes the diffusion of CO2, and the carbon sequestration amount is more than 6.5%, which is better than that of the conventional calcite system (≤5%). The vaterite usually exists in the form of nanoscale microspheres, which can effectively fill the pores inside and between the steel slag particles, making the microstructure of the artificial aggregate more dense, thereby significantly improving the single particle strength and overall density.

[0017] (3) The invention uses pomegranate peel extract as a green crystal regulator, and induces the generation of a large amount of vaterite in the steel slag through carbonation curing, solving the problems of low carbonation efficiency and poor volume stability of the calcite crystal form in the traditional process. The obtained aggregate has a vaterite purity of ≥70%, an aggregate strength of ≥6.5, a compression and steam pulverization rate of ≤3.0%, and a water immersion expansion rate of ≤0.5%, and can be used for concrete aggregate and underground filling material, realizing "waste treatment with waste". BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 XRD patterns of artificial aggregates of Example 1, Example 2 and Comparative Example 1; Figure 2 SEM images of artificial aggregates of Example 1, Example 2 and Comparative Example 1. DETAILED DESCRIPTION

[0019] The invention provides a method for preparing a vaterite-type stable artificial aggregate by pomegranate peel-steel slag cooperation, comprising the following steps: (1) Dry pomegranate peel is extracted by a hydrothermal method to obtain pomegranate peel extract; (2) Steel slag powder, cement, fly ash and pomegranate peel extract are mixed to obtain mixed raw materials, and the mixed raw materials are water sprayed to obtain aggregate; (3) The aggregate is placed for primary curing; (4) The aggregate after primary curing is placed in a carbonation box and filled with carbon dioxide for carbonation treatment; (5) The aggregate after carbonation treatment is placed for secondary curing, and the vaterite-type stable artificial aggregate is obtained.

[0020] The action principle of the invention is that the pomegranate peel polyphenol can form an organic-inorganic composite precursor by strong coordination chelation with calcium ions (Ca 2+ ) in the steel slag hydration slurry through phenolic hydroxyl groups (-OH), and in addition, its macromolecular structure and hydrophilic groups can selectively adsorb on the surface of specific growing calcium carbonate crystal nuclei, changing the relative growth rate of different crystal faces. When the CO2-rich environment contacts with the steel slag artificial aggregate doped with pomegranate peel extract, CO2 is dissolved in the pore solution to form carbonate ions (CO3 2+ ). The active components in the steel slag (mainly f-CaO and calcium silicate hydrate) rapidly dissolve Ca 2+Under the regulation of the pomegranate peel polyphenol, Ca 2+ , CO3 2+ and polyphenol molecules, the energy barrier of the vaterite nucleation is significantly reduced. The polyphenol molecules are preferentially adsorbed on the growth sites of stable crystal forms such as calcite, thereby inhibiting the formation of stable crystal nuclei, and forcing the system to precipitate calcium carbonate by forming a metastable phase with higher energy, i.e. vaterite. In the growth stage of the vaterite crystal, the polyphenol molecules are tightly adsorbed on the surface of the newly formed vaterite microcrystal to form an organic protective film. The protective film effectively blocks the direct contact between the vaterite and the solution, greatly delaying the kinetics of the "dissolution-recrystallization" process of the vaterite to calcite.

[0021] In the present application, fresh pomegranate peels are selected in step (1), the inner pulp is removed, and then drying and crushing are sequentially performed to obtain dry pomegranate peel powder.

[0022] In the present application, the drying temperature is preferably 60-100℃, further preferably 65-95℃, and more preferably 70-90℃.

[0023] In the present application, the drying time is preferably 10-24h, further preferably 11-22h, and more preferably 12-20h.

[0024] In the present application, the particle size of the dry pomegranate peel powder is preferably 400-600 mesh, further preferably 420-580 mesh, and more preferably 440-560 mesh.

[0025] In the present application, the dry pomegranate peel powder is extracted by a hydrothermal method, and after filtration, concentration and drying, a pomegranate peel extract is obtained.

[0026] In the present application, the extraction temperature in step (1) is preferably 60-100℃, further preferably 65-95℃, and more preferably 70-90℃.

[0027] In the present application, the extraction time is preferably 3-6h, further preferably 3.5-5.5h, and more preferably 4-5h.

[0028] In the present application, the mass ratio of steel slag powder, cement and fly ash in step (2) is preferably 13-15:4-6:1, further preferably 13.5-14.5:4.5-5.5:1, and more preferably 14:5:1.

[0029] In the present application, the mass of the pomegranate peel extract in step (2) is preferably 5-10% of the mass of the steel slag powder, further preferably 6-9%, and more preferably 8-7%.

[0030] In the present application, the mass ratio of the mixed raw materials and water in the water spraying granulation in step (2) is preferably 0.15-0.25:1, further preferably 0.16-0.24:1, and more preferably 0.18-0.22:1.

[0031] In the present application, the time of the water spraying granulation in step (2) is preferably ≤20 min.

[0032] In the present application, the particle size of the aggregate in step (2) is preferably 5-20 mm.

[0033] In the present application, the aggregate in step (2) is spherical particles.

[0034] In the present application, the temperature of the primary curing in step (3) is preferably 15-25℃, further preferably 16-24℃, and more preferably 18-22℃.

[0035] In the present application, the relative humidity of the primary curing is preferably 50-60%, further preferably 51-59%, and more preferably 52-58%.

[0036] In the present application, the time of the primary curing is 48-96 h, further preferably 50-90 h, and more preferably 55-85 h.

[0037] In the present application, the concentration of carbon dioxide in step (4) is preferably 20-99.9%, further preferably 30-99.9%, and more preferably 40-99.9%.

[0038] In the present application, the temperature of the carbonation treatment in step (4) is preferably 15-25℃, further preferably 16-24℃, and more preferably 18-22℃.

[0039] In the present application, the time of the carbonation treatment is preferably 12-48 h, further preferably 16-44 h, and more preferably 20-40 h.

[0040] In the present application, the pressure of the carbonation treatment is preferably 0.05-0.3 MPa, further preferably 0.1-0.2 MPa, and more preferably 0.2 MPa.

[0041] In the present application, the temperature of the secondary curing in step (5) is 15-25℃, further preferably 16-24℃, and more preferably 18-22℃.

[0042] In the present application, the relative humidity of the secondary curing is preferably ≥90%.

[0043] In the present application, the time of the secondary curing is preferably 7-28 days, further preferably 10-25 days, and more preferably 15-20 days.

[0044] The application also provides a method for preparing the ball-shaped artificial aggregate of the dolomite type by using pomegranate peel and steel slag.

[0045] The technical solutions provided by the application will be described in detail below in combination with examples, but they should not be understood as limiting the protection scope of the application.

[0046] Steel slag: converter or electric furnace steel slag, after magnetic separation and iron removal, crushing, and then grinding to a specific surface area range of 350-550 m 2 / kg.

[0047] The chemical compositions of the main raw materials used in the examples and comparative examples are shown in Table 1.

[0048] Table 1 Chemical compositions (mass fraction %) of cement, steel slag, and fly ash used in examples and comparative examples

[0049] Example 1

[0050] Fresh pomegranate peel was removed from the inner pulp, washed clean with distilled water, and dried in a dark oven at 80℃ for 12 hours until the weight was constant. The dried pomegranate peel was ground with an electric grinder and sieved through a 500-mesh sieve to obtain dry pomegranate peel powder. The dry pomegranate peel powder was taken and added to distilled water at a solid-liquid ratio of 1:40 g / mL, and heated in a constant-temperature water bath at 80℃ for 5 hours. The extract was vacuum-filtered to collect the filtrate, which was dried in a vacuum freeze dryer for 24 hours to obtain brown pomegranate peel extract, which was sealed and stored in a dry container for use.

[0051] The steel slag powder, cement, and fly ash were weighed at a mass ratio of 14:5:1, and then 10% of the pomegranate peel extract by mass of the steel slag powder was added and mixed uniformly to obtain a mixed raw material. The mixed raw material was fed into a disc granulator with an inclination angle of 45° and a rotation speed of 40 r / min, and the mass ratio of the mixed raw material to water was adjusted to 0.2:1 by spraying water. The granulation time was controlled to be within 20 min to prepare spherical granular aggregate with a particle size of 5-20 mm.

[0052] After granulation, the aggregate was placed in an environment with a temperature of 20℃ and a relative humidity of 55% for static curing for 72 h. The aggregate after the first curing was placed in a concrete carbonization box for carbonation treatment for 30 h under the conditions of a CO2 concentration of 99.9%, a pressure of 0.2 MPa, and a temperature of 20℃.

[0053] The carbonated aggregate was subjected to secondary curing at 20℃ and a relative humidity of ≥90% for 15 days to obtain the ball-shaped artificial aggregate of the dolomite type.

[0054] Example 2

[0055] The fresh pomegranate peel was removed from the inner pulp, washed clean with distilled water, and placed in a light-free oven at 80°C for drying for 12 hours until the constant weight. The dried pomegranate peel was ground with an electric grinder, and sieved through a 500-mesh sieve to obtain the dry pomegranate peel powder. The dry pomegranate peel powder was taken and added to distilled water at a solid-liquid ratio of 1:40 g / mL, and heated in a constant-temperature water bath at 80°C for 5 hours. The extract was vacuum-filtered, and the filtrate was collected. The filtrate was dried in a vacuum freeze dryer for 24 hours to obtain a brown pomegranate peel extract, which was stored in a dry container for later use.

[0056] The steel slag powder, cement, and fly ash were weighed at a mass ratio of 14:5:1, and then 5% of the pomegranate peel extract by mass of the steel slag powder was added and mixed uniformly to obtain a mixed raw material. The mixed raw material was fed into a disc granulator with an inclination angle of 45° and a rotation speed of 40 r / min, and the mass ratio of the mixed raw material to water was adjusted to 0.2:1 by spraying water. The granulation time was controlled to be within 20 min, and spherical granular aggregates with a particle size of 5-20 mm were prepared.

[0057] After granulation, the aggregates were placed in an environment at 20°C and a relative humidity of 55% for static curing for 72 h. The aggregates after the first curing were placed in a concrete carbonation box for carbonation treatment under conditions of a CO2concentration of 99.9%, a pressure of 0.2 MPa, and a temperature of 20°C for 30 h.

[0058] The carbonated aggregates were cured for a second time at 20°C and a relative humidity of ≥90% for 15 days to obtain the vaterite-type stable artificial aggregates.

[0059] Comparative Example 1

[0060] The steel slag powder, cement, and fly ash were weighed at a mass ratio of 14:5:1, and mixed uniformly to obtain a mixed raw material. The mixed material was fed into a disc granulator with an inclination angle of 45° and a rotation speed of 40 r / min, and the mass ratio of the mixed raw material to water was adjusted to 0.2:1 by spraying water. The granulation time was controlled to be within 20 min, and spherical granular aggregates with a particle size of 5-20 mm were prepared.

[0061] After granulation, the aggregates were placed in an environment at 20°C and a relative humidity of 55% for static curing for 72 h. The aggregates after the first curing were placed in a concrete carbonation box for carbonation treatment under conditions of a CO2concentration of 99.9%, a pressure of 0.2 MPa, and a temperature of 20°C for 30 h.

[0062] The carbonated aggregates were cured for a second time at 20°C and a relative humidity of ≥90% for 15 days to obtain the vaterite-type stable artificial aggregates.

[0063] Product detection: The artificial aggregates prepared in Example 1, Example 2 and Comparative Example 1 were subjected to XRD characterization, and the results are shown in Figure 1 .

[0064] As can be seen from Figure 1 , the artificial aggregate prepared in Example 1 has a pattern in which the vaterite characteristic diffraction peak is dominant, indicating that it is the main crystal phase of the product, and the effect of crystal type regulation by the extract of pomegranate peel is significant, successfully inducing and stabilizing a large amount of metastable vaterite. In the artificial aggregate prepared in Example 2, the vaterite and calcite characteristic diffraction peaks coexist, indicating that the two are significantly coexistent; it is speculated that the polyphenols selectively adsorb on the calcite growth site, inhibiting its nucleation and growth, thereby guiding the reaction to the metastable vaterite path. This phenomenon shows that the crystal regulation mechanism has taken effect, but has not yet reached the optimal state. In the artificial aggregate of Comparative Example 1, only sharp and strong calcite characteristic peaks appear, and the vaterite peak is hardly visible, indicating that when no pomegranate peel extract is added, the calcium carbonate product is almost entirely the thermodynamically stable calcite phase.

[0065] The artificial aggregates prepared in Example 1, Example 2 and Comparative Example 1 were subjected to SEM testing, and the results are shown in Figure 2 .

[0066] As can be seen from Figure 2 , the artificial aggregate of Example 1 presents a large number of nano-spherical particles with rough surfaces and abundant pores, and the molecules of the pomegranate peel extract are effectively adsorbed on the crystal growth sites, promoting the precipitation of calcium carbonate in the form of vaterite with high surface energy and high activity. In the artificial aggregate of Example 2, there are not only a small amount of residual plate-like calcite, but also a large number of irregular spherical or flower-like aggregates formed by the aggregation of nano-particles, indicating that the pomegranate peel extract effectively regulates crystal growth - both inhibiting the direct generation of calcite and guiding part of the calcium carbonate to precipitate in the form of metastable vaterite. In Comparative Example 1, typical large-size rhombic plate-like and irregular block-like structures can be observed, and the carbonation process follows the thermodynamically dominant path, with the product being almost entirely the most stable calcite phase.

[0067] Performance test

[0068] The carbonized steel slag artificial aggregates prepared in Example 1 and Comparative Example 1 were subjected to performance testing: the autoclaved pulverization rate and the water immersion expansion rate were determined in accordance with GB / T 24175-2009 “Steel Slag Stability Test Method”; the aggregate strength was calculated by formula (1) to obtain the single particle strength, and the average value of 20 samples was taken; the CO2 absorption amount was quantitatively determined by using a thermal gravimetric analyzer and a thermal gravimetric analysis method.

[0069] (1) For aggregate strength, P is the failure load (N), and d is the average diameter (mm) obtained by three axial measurements. 20 aggregate particles were tested in each group, and their average strength was reported, with the specific results shown in Table 2.

[0070] Table 2 Performance test of artificial aggregate obtained from examples and comparative examples

[0071] As can be seen from Table 1, the autoclave pulverization rate of Example 1 is the lowest, only 2.55%, which is reduced by 32.4% compared with 3.77% of Comparative Example 1, indicating that the preparation method of the present application significantly improves the durability of the aggregate structure and effectively inhibits the deterioration of unstable components. The nanometer spherical aggregate of vaterite can effectively fill the pores and construct a more dense microstructure due to its high reactivity and large specific surface area. The water immersion expansion rate of Example 1 is only 0.39%, which is reduced by 75.2% compared with 1.57% of Comparative Example 1, indicating that the preparation method of the present application can successfully convert free calcium oxide (f-CaO) and free magnesium oxide (f-MgO) in steel slag, which can easily cause delayed expansion, into stable phases. In addition, the single particle strength of Example 1 is the highest (6.74 MPa), and the CO2 fixation amount (6.76 wt.%) is also the maximum, which is better than that of Comparative Example 1 (strength 6.27 MPa). The high pore connectivity of vaterite provides a fast CO2 transport channel, promotes the extension of carbonation reaction to the inside of the aggregate, fixes more unstable components, and thus simultaneously improves the carbon fixation amount and volume stability. In contrast, although calcite is thermodynamically stable, it is dense and easy to form a passivation layer on the surface of the particle, which hinders the diffusion of CO2 inward, resulting in incomplete carbonation and ineffective fixation of internal unstable components.

[0072] From the above examples, the present application provides a vaterite type stable artificial aggregate prepared by pomegranate peel-steel slag synergy, and a preparation method thereof, which comprises the following steps: extracting dry pomegranate peel by a hydrothermal method to obtain a pomegranate peel extract; mixing steel slag powder, cement, fly ash and the pomegranate peel extract to obtain mixed raw materials, and performing water spraying granulation on the mixed raw materials to obtain an aggregate; placing the aggregate to perform first curing; placing the aggregate after first curing in a carbonation box to perform carbonation treatment by charging carbon dioxide; and placing the aggregate after carbonation treatment to perform second curing, thereby obtaining the vaterite type stable artificial aggregate. The present application uses the pomegranate peel extract as a green crystal regulator, induces the generation of a large amount of vaterite in steel slag through carbonation curing, and solves the problems of low carbonation efficiency and poor volume stability of calcite crystal in the traditional process. The obtained aggregate has a vaterite purity of ≥70%, a carbon fixation amount of ≥6.5%, an aggregate strength of ≥6.5%, an autoclave pulverization rate of ≤3.0%, and a water immersion expansion rate of ≤0.5%, and can be used for concrete aggregate and underground filling material, thereby realizing "waste treatment with waste".

[0073] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A method for synergistically preparing a ballast-like artificial bone material of aragonite type from Punica granatum peel and steel slag, characterized by, The method comprises the following steps: (1) extracting dry pomegranate peel by a hydrothermal method to obtain a pomegranate peel extract; (2) mixing steel slag powder, cement, fly ash and the pomegranate peel extract to obtain mixed raw materials, and spraying the mixed raw materials to obtain aggregates; (3) allowing the aggregates to stand for primary curing; (4) placing the aggregates after the primary curing in a carbonation box, and charging carbon dioxide to perform carbonation treatment on the aggregates; (5) allowing the aggregates after the carbonation treatment to stand for secondary curing, thereby obtaining the stable aggregate of aragonite type.

2. A method of preparing a ballast of aragonite type of artificial bone material in coordination with Punica granatum and steel slag according to claim 1, characterized in that, In the step (1), the temperature for extraction is 60-100 DEG C, and the extraction time is 3-6 hours.

3. A method of preparing a ballast of aragonite type of artificial bone material in coordination with Punica granatum and steel slag according to claim 1, characterized in that, In the step (2), the mass ratio of the steel slag powder, the cement and the fly ash is 13-15:4-6:1; In the step (2), the mass of the pomegranate peel extract is 5-10% of the mass of the steel slag powder.

4. The method of claim 1, wherein the method of preparing the ballite type stable artificial aggregate from Punica granatum and steel slag is characterized by, In the step (2), the mass ratio of the mixed raw materials to water in the spraying is 0.15-0.25:1; In the step (2), the particle size of the aggregates is 5-20 mm.

5. A method of preparing a ballast of aragonite type of artificial bone material in coordination with Punica granatum and steel slag according to claim 1, characterized in that, In the step (3), the temperature for the primary curing is 15-25 DEG C, the relative humidity for the primary curing is 50-60%, and the primary curing time is 48-96 hours.

6. A method of preparing a ballast of aragonite type of artificial bone material in coordination with Punica granatum and steel slag according to claim 1, characterized in that, In the step (4), the concentration of the carbon dioxide is 20-99.9%; In the step (4), the temperature for the carbonation treatment is 15-25 DEG C, the carbonation treatment time is 12-48 hours, and the carbonation treatment pressure is 0.05-0.3 MPa.

7. A method of preparing a ballast of aragonite type of artificial bone material in coordination with Punica granatum and steel slag according to claim 1, characterized in that, In the step (5), the temperature for the secondary curing is 15-25 DEG C, the relative humidity for the secondary curing is greater than or equal to 90%, and the secondary curing time is 7-28 days.

8. The stable aggregate of aragonite type prepared by the method for preparing the stable aggregate of aragonite type by using pomegranate peel and steel slag in cooperation according to claims 1-7.

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