A method for preparing arsenic-cadmium lattice mineralized immobilized silicate mineral materials based on mechanochemical ball milling and its application

Abstract

This invention discloses a method for preparing arsenic-cadmium lattice mineralized and immobilized silicate mineral materials based on mechanochemical ball milling and its application. The invention aims to solve the technical problems of poor arsenic and cadmium immobilization and ineffective immobilization in existing silicate mineral materials. Preparation method: 1. Mix iron oxide yellow and serpentine evenly to obtain an iron-serpentine composite silicate mineral material; 2. Place the iron-serpentine composite silicate mineral material in a ball mill jar and ball mill it at a controlled speed to obtain an arsenic-cadmium lattice mineralized and immobilized silicate mineral material. Application: This invention involves adding the arsenic-cadmium lattice mineralized and immobilized silicate mineral material to polluted water or soil. This invention uses a mechanochemical method to form a surface bond between iron manganese oxides and serpentine, constructing a composite interface with multiple synergistic effects, improving the adsorption performance of cadmium and arsenic, and significantly promoting the diffusion and immobilization process of heavy metal ions into the serpentine lattice.

Description

Technical Field

[0001] This invention belongs to the field of heavy metal remediation materials, specifically relating to a method for preparing arsenic-cadmium lattice mineralized fixed silicate mineral materials based on mechanochemical ball milling and its application. Background Technology

[0002] In-situ passivation technology has become one of the mainstream approaches to heavy metal pollution remediation due to its advantages such as minimal soil disturbance and no impact on cultivation. Among these, passivation materials based on silicate minerals are considered a crucial foundation for developing green and economical soil conditioners due to their good environmental compatibility, ability to provide nutrients, and lack of secondary pollution risk. However, cadmium (Cd) and arsenic (As) often coexist in the soil environment, and their chemical properties are contradictory: increasing soil pH can effectively reduce Cd activity but significantly enhances the migration capacity of As (especially arsenate, AsO4³⁻). Therefore, developing materials that can simultaneously and efficiently immobilize arsenic and cadmium under neutral to weakly alkaline conditions is a prominent technological challenge.

[0003] Currently, activating silicate minerals through mechanochemical processes to enhance their cation exchange capacity or construct ion exchange channels has become an effective pathway for Cd²⁺ fixation without significantly increasing pH. However, this mechanism based on surface adsorption or ion exchange has limitations regarding its effectiveness against AsO₄⁻. 3- The fixation effect is limited, especially in alkaline environments, where negatively charged AsO4... 3- Arsenic exhibits repulsive forces with similarly negatively charged mineral surfaces and is easily desorbed by competing anions. Research indicates that the key to achieving long-term stable arsenic fixation lies in lattice mineralization, specifically AsO4. 3- It enters the mineral lattice through isomorphic substitution (e.g., replacing Si in silicon-oxygen tetrahedra). 4+ Studies of natural geological processes (such as serpentinization) and artificial synthesis have confirmed that magnesium-rich silicate minerals (such as brucite and serpentine) are potential hosts for arsenate lattice doping. This provides a key mechanistic insight for designing materials that can simultaneously fix arsenic and cadmium: ideal materials must possess both the ability to rapidly fix Cd on the surface and the ability to fix As through lattice mineralization.

[0004] Serpentine (Mg6(Si4O) 10 (OH)8) is a typical magnesium-rich layered silicate mineral, whose structure contains Mg 2+ OH - The serpentine and its silicon-oxygen structural units provide ideal sites for Cd adsorption / precipitation and As isomorphous substitution, respectively. While serpentine and its tailings are abundant, their utilization rate is low, and large-scale stockpiling poses significant environmental risks. Developing remediation materials using serpentine as a raw material offers the dual benefits of environmental remediation and solid waste resource recovery.

[0005] Although existing passivation materials have achieved the immobilization of Cd or As, a single material system capable of simultaneously driving the immobilization of two heavy metals with opposite properties, arsenic and cadmium, under neutral conditions and ultimately guiding them towards stable lattice mineralization remains a gap. Existing iron-based composite adsorbent materials, such as those described in "A High-Reduction-Active Zero-Valence Iron-Mineral Composite Material and Its Preparation Method" and "A Perovskite-Type Composite Oxide Containing High-Valence Iron (Fe(IV)) and Its Low-Temperature Calcination Synthesis Method and Application," primarily rely on the physical or chemical adsorption of pollutants due to their large specific surface area for the removal of heavy metals like arsenic and cadmium. Zero-valent iron-mineral composite materials can remove either cadmium or arsenic ions, while perovskite-type composite oxides containing high-valence iron (Fe(IV)) only remove arsenic ions. It is difficult to achieve simultaneous immobilization of As and Cd, and the immobilization stability of As and Cd by these two composite materials is insufficient.

[0006] Furthermore, no reports have been found regarding the fixation mechanism involving lattice mineralization. In particular, no studies have been reported on the synergistic use of multiple fixation mechanisms, namely "surface adsorption-lattice diffusion-isomorphic substitution," in combination with mechanochemically activated serpentine and iron oxides. Summary of the Invention

[0007] The purpose of this invention is to solve the technical problems of the difficulty in fixing arsenic and cadmium in existing silicate mineral materials and the poor fixing effect, and to provide a method for preparing iron-serpentine composite materials based on mechanochemical ball milling and its application.

[0008] The present invention describes a method for preparing arsenic-cadmium lattice mineralized immobilized silicate mineral materials based on mechanochemical ball milling, which is implemented according to the following steps:

[0009] I. Preparation of mixed pre-fabricated samples:

[0010] Iron oxide yellow (Fe2O3·xH2O) and serpentine (6MgO·4SiO2·4H2O) were mixed evenly according to the Fe:Mg molar ratio (0.1~2):1 to obtain iron-serpentine (Fe-SP) composite silicate mineral material;

[0011] II. Ball milling preparation of iron-serpentine (Fe-SP) composite silicate mineral materials:

[0012] Iron-serpentine composite silicate mineral material was placed in a ball mill jar, and the ball milling speed was controlled at 200~600 rpm for 1~3 h to obtain arsenic-cadmium lattice mineralized fixed silicate mineral material.

[0013] The application of the arsenic-cadmium lattice mineralized fixed silicate mineral material based on mechanochemical ball milling is to add the arsenic-cadmium lattice mineralized fixed silicate mineral material to water containing arsenic and cadmium pollutants in order to remove arsenic and cadmium pollutants from the water.

[0014] The application of the arsenic-cadmium lattice mineralized fixed silicate mineral material based on mechanochemical ball milling in this invention involves adding the arsenic-cadmium lattice mineralized fixed silicate mineral material to soil containing arsenic and cadmium pollutants for mixing, in order to remove arsenic and cadmium pollutants from the soil.

[0015] In the ball milling activation process of the raw materials, each raw material is continuously crushed, sheared, and squeezed by the ball milling media, which increases the degree of amorphization of serpentine and enhances the mixing degree between materials. The serpentine crystal structure undergoes continuous distortion and bond breaking, which enhances the activity of Mg and Si elements in the structure. At the same time, the substitution process of Fe element for Mg in the magnesium-oxygen octahedron of the structure further intensifies this phenomenon, resulting in the formation of a new phase of iron silicate mineral Fe2Si2O5(OH)4·2H2O (PDF#26-1140). This indicates that the direct interaction between the iron source and serpentine silicate mineral during the ball milling reaction is not a simple physical process such as mixing and refining, but also a chemical interaction process of chemical bond breaking and new phase production.

[0016] This invention uses a mechanochemical method to form a surface bond between iron-manganese oxides and serpentine, constructing a composite interface (adsorption-mineralization interface) with multiple synergistic effects: it can not only enhance the adsorption capacity for arsenate through charge neutralization, but also provide preferential adsorption sites with strong affinity for both cadmium and arsenic; more importantly, it can significantly promote the diffusion and fixation process of heavy metal ions into the interior of the serpentine lattice.

[0017] The present invention relates to a method for preparing iron-serpentine composite materials based on mechanochemical ball milling and its applications, which has the following beneficial effects:

[0018] 1. Silicate minerals, as one of the components of soil, do not damage the soil structure. Serpentine is a typical representative of silicates. Nearly ten million tons of serpentine tailings are discarded every year, occupying a large amount of land and easily causing serious environmental pollution. Moreover, the comprehensive utilization level is not high and the utilization rate of effective components is low. This invention will significantly improve the resource utilization value of serpentine and reduce the cost of passivating agent materials.

[0019] 2. The iron-serpentine composite silicate mineral material provided by this invention fixes As and Cd based on the mechanism of lattice mineralization, which can effectively increase the proportion of As and Cd residues in the soil and effectively avoid the re-dissolution of As and Cd caused by the aging of passivating agent materials. Attached Figure Description

[0020] Figure 1 Fe with different Fe:Mg molar ratios obtained in Example 1 of this invention x -SP's XRD pattern;

[0021] Figure 2Example 2 illustrates the adsorption and fixation effects (a and b) of different Fe-SP dosages on As and Cd in an As-Cd solution system, and the presence of Mg in the system. 2+ Concentration (c), pH change graph (d);

[0022] Figure 3 To obtain the precipitation XRD patterns of Fe-SP after reaction in As, Cd and As-Cd mixed solutions in Example 1;

[0023] Figure 4 Different Fe values ​​obtained in Example 2 0.25 -Graph showing the changes in the speciation of As and Cd in soil after 60 days of flooding culture under SP application level;

[0024] Figure 5 This is a test diagram showing the changes in the speciation of As and Cd in the soil after 30 cycles of dry-wet and freeze-thaw cycles under different fixative treatments in the aging experiment of the passivating agent in Example 3. Detailed Implementation

[0025] Specific Implementation Method 1: This implementation method for preparing arsenic-cadmium lattice mineralized immobilized silicate mineral materials based on mechanochemical ball milling is carried out according to the following steps:

[0026] I. Preparation of mixed pre-fabricated samples:

[0027] Iron oxide yellow (Fe2O3·xH2O) and serpentine were mixed evenly according to the Fe:Mg molar ratio (0.1~2):1 to obtain iron-serpentine (Fe-SP) composite silicate mineral material;

[0028] II. Ball milling preparation of iron-serpentine (Fe-SP) composite silicate mineral materials:

[0029] Iron-serpentine composite silicate mineral material was placed in a ball mill jar, and the ball milling speed was controlled at 200~600 rpm for 1~3 h to obtain arsenic-cadmium lattice mineralized fixed silicate mineral material.

[0030] In this embodiment, iron oxide yellow is selected as the iron source and serpentine is selected as the silicate mineral. The initial enrichment of heavy metals is achieved through the strong adsorption effect of iron oxide. The active components released by mechanically activating serpentine drive As and Cd to diffuse into the interior of the mineral and finally achieve synchronous, stable and irreversible fixation in the form of lattice substitution or precipitation.

[0031] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that in step one, iron oxide yellow (Fe2O3·xH2O) and serpentine are mixed evenly according to the Fe:Mg molar ratio (0.25~0.5):1.

[0032] This embodiment optimizes the Fe:Mg molar ratio, thereby improving the fixation of Cd and As contaminants by the arsenic-cadmium lattice mineralization-fixed silicate mineral passivation material.

[0033] Specific Implementation Method 3: This implementation method differs from Specific Implementation Method 2 in that in step one, iron oxide yellow (Fe2O3·xH2O) and serpentine are mixed evenly according to a Fe:Mg molar ratio of 0.25:1.

[0034] This implementation method optimizes the Fe:Mg molar ratio.

[0035] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the ball milling speed is controlled at 400~600 rpm and the ball milling time is 1~3 hours in step two.

[0036] Specific Implementation Method 5: This implementation method differs from Specific Implementation Method 4 in that the ball milling speed is controlled at 600 rpm and the ball milling time is 1 hour in step 2.

[0037] Specific Implementation Method Six: This implementation method is based on the application of arsenic-cadmium lattice mineralization and fixed silicate mineral materials through mechanochemical ball milling. It involves adding arsenic-cadmium lattice mineralization and fixed silicate mineral materials to water containing arsenic and cadmium pollutants in order to remove arsenic and cadmium pollutants from the water.

[0038] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Method Six in that the arsenic and cadmium pollutants in the water are arsenic ions, cadmium ions, or complexes formed by arsenic and cadmium ions and humic acid.

[0039] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Method Six in that the pH of the water containing arsenic and cadmium pollutants is 4~9.

[0040] This embodiment can simultaneously remove arsenic and cadmium from water under neutral to alkaline conditions.

[0041] Specific Implementation Method Nine: This implementation method is based on the application of arsenic-cadmium lattice mineralized fixed silicate mineral materials through mechanochemical ball milling. It involves adding arsenic-cadmium lattice mineralized fixed silicate mineral materials to soil containing arsenic and cadmium pollutants and mixing them to remove arsenic and cadmium pollutants from the soil.

[0042] Specific Implementation Method 10: This implementation method differs from Specific Implementation Method 9 in that the arsenic and cadmium pollutants in the soil are sodium arsenate and cadmium nitrate.

[0043] Example 1: The preparation method of arsenic-cadmium lattice mineralized fixed silicate mineral material based on mechanochemical ball milling in this example is carried out according to the following steps:

[0044] I. Preparation of mixed pre-fabricated samples:

[0045] Iron oxide yellow (Fe₂O₃·xH₂O) and serpentine (SP) were mixed evenly according to a Fe:Mg molar ratio of x:1, with x ranging from 0.1 to 2, to obtain iron-serpentine Fe x -SP composite silicate mineral materials;

[0046] II. Ball milling preparation of iron-serpentine (Fe-SP) composite silicate mineral materials:

[0047] Iron-serpentine composite silicate mineral material was placed in the ball mill jar of a planetary ball mill, and the ball milling speed was controlled at 600 rpm for 1 hour to activate the material and obtain arsenic-cadmium lattice mineralized fixed silicate mineral material (passivating agent).

[0048] The Fe prepared in this embodiment x -SP's XRD test graph is as follows Figure 1 As shown, from Figure 1 The XRD results show that as the Fe:Mg molar ratio gradually increases to 1:1, the new phase Fe2Si2O5(OH)4·2H2O (PDF#26-1140), which should be generated during the co-ball milling of SP and FeOOH, gradually becomes more apparent. During the ball milling process, the serpentine lattice structure undergoes continuous distortion and bond breaking, which enhances the activity of Mg and Si elements in the structure. At the same time, the substitution of Mg by Fe in the magnesium-oxygen octahedron of the structure further intensifies this phenomenon, leading to the formation of the iron silicate mineral Fe2Si2O5(OH)4·2H2O. x XRD analysis of SP revealed Fe substitution of Mg in the magnesium-oxygen octahedron during the Mg-O fracture process. Numerous Mg-O(H) bonds and Si-O-Mg bonds were broken in the serpentine lattice.

[0049] Example 2: Using Fe0-SP (i.e., ball-milling activated serpentine mineral sample alone) and Fe 0.5 -SP sample was used as a control. 0.5g of original SP sample (unmilled), Fe0-SP, and Fe were respectively... x The SP sample was dispersed in a beaker containing 100 mL of ultrapure water and stirred on a magnetic stirrer. The initial pH of the solution was 6.5 ± 0.2, and the stirring time was 240 min. After the reaction was completed, the supernatant was taken and filtered through a 0.45 μm filter membrane to test the concentration of Mg and Si in the solution and the pH value of the solution.

[0050] Table 1. Solubility Test Results of Different Types of Serpentine

[0051]

[0052] The test results of this embodiment are shown in Table 1. From the results, it can be seen that Fe... 0.5The Si and Mg dissolution rates in the -SP sample were significantly higher than those in the original SP sample and the Fe0-SP sample, indicating that after mechanochemical activation, the serpentine lattice became disordered, resulting in severe collapse and deformation of the magnesium-oxygen octahedral structure and breakage of the MO bonds. This reduced the interlayer hydrogen bonding forces and decreased the stability of the serpentine crystal structure. At the same time, it facilitated the exposure of active magnesium and hydroxyl sites on the serpentine surface, promoting the interaction between serpentine and other reactants. Furthermore, the addition of an iron source further promoted the amorphization process of the serpentine lattice structure due to the substitution of magnesium by iron in the magnesium-oxygen octahedron, causing the Si-O and Mg-O in the structure to break, making it easier for hydroxyl groups, magnesium ions, and silicate ions to detach from the structure.

[0053] Application Example 1

[0054] Accurately weigh a certain amount of Fe 0.25 SP adsorbent was added to 100 mL of a mixed As-Cd solution (As = 20 mg / L; Cd = 100 mg / L). The initial pH of the reaction was 6.5 ± 0.2. The beaker was placed on a magnetic stirrer with a stirring speed of 400 rpm, a reaction temperature of 25°C, and a reaction time of 4 h. After the reaction was complete, the solution was immediately filtered through a 0.45 μm disposable aqueous filter. The solution was stored at 4°C for analysis. The filtered solid was used for XRD analysis after the reaction was completed.

[0055] In this application example 1, different dosages of Fe... 0.25 -SP's effect on the fixation of As and Cd in As-Cd mixed solutions and the amount of Mg in the solution 2+ and pH changes, such as Figure 2 As shown, Fe 0.25 SP exhibits excellent adsorption and fixation capacity for As in As-Cd mixed solutions. Even at a dosage of 0.1 g / L, it maintains excellent adsorption and fixation performance for As in the mixed solution. As the dosage increases to 1.0 g / L, the adsorption and fixation efficiency for Cd gradually increases from 58.2% to 97.5% and then tends to stabilize. Increasing the dosage can help fix Cd. 2+ The adsorption and fixation provide more active sites, and at the same time, the increase in solution pH will also benefit Cd. 2+ In Fe 0.25 - SP surface adsorption fixation allows for the exchange of Mg in the serpentine structure. 2+ The amount also increased accordingly, to Cd 2+ This provides more sites for further mineralization and fixation within the serpentine structure.

[0056] After the reaction, the solid was filtered and used for XRD analysis. The results are as follows: Figure 3As shown, in the As-Cd mixed solution, in addition to the CdCO3 phase, the co-precipitated As and Cd phase Cd2As2O7 was also found, indicating that the fixation process of Cd in the solution mainly involves two pathways: mineralization fixation in the form of CdCO3 and synergistic fixation in Cd2As2O7. Simultaneously, small peaks of the Fe3(AsO4)2·6H2O phase were observed, and the hydrated sodium silicate phase NaSi4O8(OH)·4H2O (PDF#48-0655) formed by Na substituting Fe was also found. Based on the above analysis, it is speculated that As in the solution is adsorbed and fixed on the surface of the Fe-SP adsorbent through a chelation reaction with Fe-OH, and then further fixed with Fe... 0.25 In Fe-SP, Fe2Si2O5(OH)4·2H2O undergoes a heterogeneous crystallization precipitation reaction, mineralizing and fixing the poorly crystallized Fe3(AsO4)2·6H2O phase onto Fe-SP. At the same time, sodium replaces Fe positions to form the NaSi4O8(OH)·4H2O phase.

[0057] Application Example 2

[0058] Weigh 100g of actual As-Cd composite contaminated soil and mix it with Fe in proportions of 0%, 0.5%, 1%, 2%, and 3%. 0.25 After thoroughly mixing the SP passivating agent, it was placed into a custom-made plexiglass column, and water was added to submerge the soil by 3-5 cm. The top was sealed with a breathable sealing film, and the column was placed in a 25℃ incubator for cultivation. After 60 days of cultivation, soil samples were collected, freeze-dried, ground, and passed through a 100-mesh sieve. These samples were used to analyze the soil's physicochemical properties and to study the Fe content after simultaneous As and Cd fixation using the BCR sequential extraction method. 0.25 -The proportions of water-soluble, weakly acid-extractable, reducible, oxidizable, and residue-bound heavy metals in SP were examined to determine the Fe content. 0.25 -SP's effect on the remediation of As-Cd complex contaminated soil.

[0059] In this application example 2, different Fe... 0.25 The results of changes in the speciation of As and Cd in the soil after 60 days of flooding under SP application are as follows: Figure 4 As shown, it can be clearly observed that with Fe 0.25 With increasing SP dosage, the proportions of As and Cd in the residue significantly increased, while the proportions of the more mobile water-soluble, weakly acid-extractable, and reducible forms decreased to varying degrees. This result further indicates that Fe... 0.25 The addition of SP helps to stabilize the synchronization of As and Cd, reducing their migration.

[0060] Application Example 3

[0061] The effects of different fixative materials on the fixation of As-Cd contaminated soil during aging experiments are investigated, and the specific steps are as follows:

[0062] Wet-dry cycle test: Four 100g portions of As-Cd contaminated soil were weighed. Three of these portions were each supplemented with 2.0% (wt%) of a fixative material, namely activated SP, iron oxide, and Fe. 0.25 -SP, mix thoroughly and evenly, with one sample as a control without added materials. Adjust the soil moisture content to 60%, incubate at 25℃ for 16 hours, dry at 60℃ for 8 hours, weigh the dried sample, add an appropriate amount of deionized water, and readjust to the initial moisture content. This process is recorded as one wet-dry cycle, lasting 24 hours. Subsequently, samples were taken at the end of cycles 0, 5, 10, 15, 20, and 30, dried, ground, sieved, and measured. Freeze-thaw cycle test: Prepare the same four soil samples (CK and activated SP, iron oxide, Fe) as above. 0.25 (SP addition group), the moisture content was adjusted to 60%, and the sample was frozen at -20°C for 16 h, and then thawed at 25°C for 8 h. This process was recorded as one freeze-thaw cycle, lasting 24 h. Subsequently, samples were taken at the end of the 0th, 5th, 10th, 15th, 20th and 30th cycles, dried, ground and sieved, and the speciation of As and Cd in the soil was determined.

[0063] In this application example 3, the changes in the speciation of As and Cd in the soil after 30 cycles of dry-wet and freeze-thaw cycles under different fixative treatments are as follows: Figure 5 As shown. The effects of alternating wet and dry conditions and freeze-thaw cycles on Fe. 0.25 Both As and Cd are released to varying degrees in the SP soil. The alternating wet-dry cycle and freeze-thaw cycle cause material aging, leading to mechanical breakage, surface oxidation, dissolution of organic matter and minerals, thus reducing the stabilization efficiency for As and Cd. However, compared to the CK group, the addition of Fe... 0.25 The -SP group soil still exhibited excellent fixation performance for As and Cd in the soil, reflecting the Fe... 0.25 -The long-term stability of SP materials.

[0064] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing arsenic-cadmium lattice mineralized immobilized silicate mineral materials based on mechanochemical ball milling, characterized in that... The preparation method of the arsenic-cadmium lattice mineralized fixed silicate mineral material is carried out according to the following steps: I. Preparation of mixed pre-fabricated samples: Iron oxide yellow and serpentine were mixed evenly according to the Fe:Mg molar ratio (0.1~2):1 to obtain an iron-serpentine composite silicate mineral material. II. Ball milling preparation of iron-serpentine composite silicate mineral materials: Iron-serpentine composite silicate mineral material was placed in a ball mill jar, and the ball milling speed was controlled at 200~600 rpm for 1~3 h to obtain arsenic-cadmium lattice mineralized fixed silicate mineral material.

2. The method for preparing arsenic-cadmium lattice mineralized immobilized silicate mineral materials based on mechanochemical ball milling according to claim 1, characterized in that... In step one, iron oxide yellow and serpentine are mixed evenly according to the Fe:Mg molar ratio of (0.25~0.5):

1.

3. The method for preparing arsenic-cadmium lattice mineralized immobilized silicate mineral materials based on mechanochemical ball milling according to claim 2, characterized in that... In step one, iron oxide yellow and serpentine are mixed evenly according to the Fe:Mg molar ratio of 0.25:

1.

4. The method for preparing arsenic-cadmium lattice mineralized immobilized silicate mineral materials based on mechanochemical ball milling according to claim 1, characterized in that... In step two, the ball mill speed is controlled at 400~600 rpm and the ball milling time is 1~3 hours.

5. The method for preparing arsenic-cadmium lattice mineralized immobilized silicate mineral materials based on mechanochemical ball milling according to claim 5, characterized in that... In step two, the ball mill speed is controlled at 600 rpm and the ball milling time is 1 hour.

6. The application of the arsenic-cadmium lattice mineralized immobilized silicate mineral material prepared according to claim 1 using mechanochemical ball milling, characterized in that... The application of arsenic-cadmium lattice mineralization and immobilization silicate mineral materials based on mechanochemical ball milling involves adding arsenic-cadmium lattice mineralization and immobilization silicate mineral materials to water containing arsenic and cadmium pollutants in order to remove arsenic and cadmium pollutants from the water.

7. The application of the arsenic-cadmium lattice mineralized immobilized silicate mineral material based on mechanochemical ball milling according to claim 6, characterized in that... Arsenic and cadmium pollutants in water are arsenic ions, cadmium ions, or complexes formed by arsenic and cadmium ions and humic acid.

8. The application of the arsenic-cadmium lattice mineralized immobilized silicate mineral material based on mechanochemical ball milling according to claim 6, characterized in that... The pH of water bodies containing arsenic and cadmium pollutants is 4 to 9.

9. The application of the arsenic-cadmium lattice mineralized immobilized silicate mineral material prepared according to claim 1 using mechanochemical ball milling, characterized in that... The application of arsenic-cadmium lattice mineralized fixed silicate mineral materials based on mechanochemical ball milling involves adding arsenic-cadmium lattice mineralized fixed silicate mineral materials to soil containing arsenic and cadmium pollutants for mixing, in order to remove arsenic and cadmium pollutants from the soil.

10. The application of the arsenic-cadmium lattice mineralized immobilized silicate mineral material based on mechanochemical ball milling according to claim 9, characterized in that... Arsenic and cadmium pollutants in soil are sodium arsenate and cadmium nitrate.

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