Manufacturing method for zeolite stabilizer based on bottom ash doped with magnetite particles, and stabilizer for soil contaminated with cation and anion manufactured therefrom

Abstract

The present invention relates to a method for manufacturing a bottom material-based zeolite stabilizer supported with magnetite particles and to a cation and anion-contaminated soil stabilizer manufactured thereby. More specifically, the zeolite stabilizer according to the present invention can simultaneously stabilize cationic heavy metals such as lead, copper, and cadmium, as well as oxyanions such as trivalent to pentavalent arsenic, in wastewater discharged from the chemical industry. In particular, by improving the characteristics of zeolites, which have excellent reactivity toward cationic heavy metals but low reactivity toward pollutants existing as oxyanions such as trivalent to pentavalent arsenic, it is possible to simultaneously stabilize complex soil contaminated by arsenic and heavy metal cations. Furthermore, the zeolite stabilizer according to the present invention is made by recycling bottom materials that are conventionally landfilled as industrial waste, and thus has excellent effects in terms of securing economic viability through resource recycling and preventing environmental pollution.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing a flooring-based zeolite stabilizer supported with magnetite particles and a cation and anion contaminated soil stabilizer manufactured thereby. Background Technology

[0002] This achievement was made possible through the support of the Ansan Green Environment Support Center for the "Development of Coal Bottom Ash-Based Stabilization Materials for Reducing Risks of Heavy Metal-Contaminated Dredged Sediments (Project No.: 23-07-04-60-61)".

[0003] With the advancement of science, technology, and industry today, the demand for electrical energy continues to rise, and consequently, the operating volume of coal-fired power plants is also continuously increasing. Consequently, the generation of coal ash (or coal dust) as a byproduct of combustion from coal-fired power plants is increasing rapidly. Meanwhile, according to a 2014 report by the Korea Environment Institute, more than 8 million tons of coal ash are emitted annually from domestic thermal power plants; of this amount, 70% is recycled, while the remainder is disposed of in landfills.

[0004] Meanwhile, coal ash is also known as a suitable precursor material for zeolite synthesis because it contains large amounts of silicon (Si) and aluminum (Al). Zeolites are three-dimensional tetrahedral aluminosilicate minerals containing Al 3+ Si by 4+ The negative charge generated by the homomorphic substitution of and the cation (Na) to balance it. + , Ca 2+ , Mg 2+It is a material that has water molecules in its pores and channels. In particular, zeolite Na-A is a representative zeolite form that has an 'LTA' structure consisting of an 8-membered ring (8MR) with a diameter of 0.41 nm and six small windows connected to an α-cage with a diameter of 1.14 nm. Zeolite Na-A is known to have a higher cation exchange capacity (CEC) compared to other forms of zeolite and is a material that is easy to remove hydrated heavy metal ions with a radius smaller than the pore size (0.47 nm).

[0005] Meanwhile, contamination by anions such as trivalent to pentavalent arsenic, along with cationic heavy metals such as lead, copper, and cadmium, is being found in soils and sediments surrounding smelters, industrial complexes, and mines. Zeolites have high cation exchange capacity, so while they are highly reactive with cationic heavy metals such as lead (Pb), copper (Cu), and cadmium (Cd), they are less reactive with trivalent or pentavalent arsenic existing as oxyanions; therefore, separate surface modification is required to simultaneously stabilize anions such as arsenic and cationic heavy metals.

[0006] Meanwhile, as industry develops, soil contamination by heavy metals occurs frequently, and with the recent rise in interest in soil contamination, research on remediation is actively underway. Previously, when the total concentration of contaminants in the soil exceeded the concern standard, soil contamination was remediated in accordance with the Soil Environment Conservation Act, with the remediation target set as the concern standard. However, recently, rather than setting the remediation target to satisfy the concern standard for the total content of contaminants, a method is being introduced to set remediation targets through risk assessment that considers the mobility, toxicity, and exposure pathways of contaminants in the actual contaminated soil.

[0007] Accordingly, the Ministry of Environment adopted and applied the stabilization method as an alternative risk reduction measure for the first time in Korea for the soil contamination remediation project around the Janghang Smelter. Stabilization technology is a technique that reduces risk by injecting a stabilizer into contaminated soil or waste to chemically convert pollutants into a stabilized form (through precipitation, formation of insoluble compounds, adsorption, etc.), thereby reducing leaching, mobility, and bioavailability.

[0008] In the United States, the USEPA designated stabilization technology as the Best Demonstrated Available Technology (BDAT) as a treatment technology to reduce the risks of dozens of types of hazardous waste specified in the Resource Conservation and Recovery Act (RCRA) of 1993, and since then, much research has been conducted on the development of various stabilizers. The problem to be solved

[0009] The present invention was devised to solve the problems of the prior art and aims to provide a bottom ash-based zeolite stabilizer supported with magnetite particles and a method for manufacturing the same, which can simultaneously stabilize cationic heavy metals such as lead, copper, and cadmium, as well as trivalent arsenic and pentavalent arsenic anions present as oxyacid anions, by producing zeolite Na-A from bottom ash and supporting iron oxide particles in the form of magnetite on the zeolite Na-A.

[0010] Furthermore, the technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art to which the present invention belongs from the description below. means of solving the problem

[0011] The present specification provides a method for manufacturing a zeolite stabilizer comprising: a) a step of manufacturing zeolite Na-A from bottom ash; and b) a step of supporting magnetite particles on the zeolite Na-A.

[0012] For example, the above step a may further include the step (a-1) of washing and drying the flooring material with distilled water and a 0.1 M nitric acid solution.

[0013] For example, the above step a may further include a step (a-2) of mixing the dried flooring material with sodium hydroxide (NaOH) in a weight ratio of 1:1 to 2 parts and melting the mixture in a temperature range of 500 to 600 ℃ to extract silicon (Si) and aluminum (Al) from the flooring material.

[0014] For example, the above step a may further include the step (a-3) of mixing the molten product with water to prepare an aluminosilicate gel and mixing sodium aluminate (NaAlO2) to adjust the molar ratio of silicon (Si) and aluminum (Al).

[0015] For example, the above step a may further include a step (a-4) of forming zeolite Na-A by hydrothermally reacting the aluminosilicate gel at a temperature range of 90 to 110 ℃ for 4 to 8 hours.

[0016] For example, the above step b involves the zeolite Na-A prepared in the above step a as trivalent iron (Fe 3+ ) and divalent iron (Fe 2+ It may further include the step (b-1) of adding to a solution mixed in a 2:1 molar ratio so that iron ions are supported on the surface of zeolite Na-A particles.

[0017] For example, the above step b may further include a step (b-2) of raising the temperature of the solution of b-1 to 70 to 90 ℃, adjusting the pH range to 9 to 11, and then allowing iron ions to be supported on the surface of zeolite Na-A in the form of magnetite.

[0018] In addition, the present specification provides a zeolite stabilizer comprising: zeolite Na-A, which is prepared by the above method and contains a substitutable zeolite cation; and magnetite particles supported on the surface of the zeolite Na-A.

[0019] For example, the BET specific surface area of ​​the zeolite Na-A supported with the magnetite particles is 261 m² 2 / g can be.

[0020] For example, the cation exchange capacity of the zeolite Na-A supported with the above magnetite particles may be 242 meq / 100g.

[0021] For example, the zeolite stabilizer may have a maximum stabilization performance of 38.76 mg / g for trivalent arsenic in water under conditions of an initial trivalent arsenic anion concentration of 5 to 200 mg / L, pH 4, reaction time of 3 hours, stabilizer addition ratio of 0.5 g / L, and ionic strength of 0.01 M NaCl.

[0022] For example, the zeolite stabilizer may have a maximum stabilization performance of 46.95 mg / g for pentavalent arsenic in water under conditions of an initial pentavalent arsenic anion concentration of 5 to 200 mg / L, pH 4, reaction time of 3 hours, stabilizer addition ratio of 0.5 g / L, and ionic strength of 0.01 M NaCl. Effects of the invention

[0023] The zeolite stabilizer according to the present invention can simultaneously stabilize cationic heavy metals such as lead, copper, and cadmium, as well as oxyanions such as trivalent arsenic to pentavalent arsenic, in wastewater discharged from the chemical industry.

[0024] In particular, by improving the properties of zeolite, which has excellent reactivity for cationic heavy metals but low reactivity for pollutants existing as oxyacid anions such as trivalent arsenic to pentavalent arsenic, it is possible to simultaneously stabilize soil contaminated with arsenic and heavy metal cations.

[0025] In addition, the zeolite stabilizer according to the present invention is made by recycling bottom materials that are conventionally landfilled as industrial waste, and thus has excellent effects in terms of securing economic efficiency through resource recycling and preventing environmental pollution. Brief explanation of the drawing

[0026] Figure 1 is a schematic diagram of a method for manufacturing a flooring-based Na-A zeolite according to an embodiment of the present invention. Figure 2 is a photograph of a flooring-based Na-A zeolite prepared according to an embodiment of the present invention. Figure 3 is the XRD analysis result of a flooring-based Na-A zeolite prepared according to an embodiment of the present invention. FIG. 4 is a schematic diagram illustrating a method of supporting magnetite particles on a flooring-based Na-A zeolite manufactured according to an embodiment of the present invention. Figure 5 shows a mechanism for supporting magnetite particles on a flooring-based Na-A zeolite prepared according to an embodiment of the present invention. Figure 6 is a photograph of a magnetite-supported bottom material-based Na-A zeolite prepared according to an embodiment of the present invention. Figure 7 compares the stabilization efficiency for trivalent arsenic, pentavalent arsenic, and lead in water according to the magnetite loading ratio of bottom material-based Na-A zeolite prepared according to an embodiment of the present invention. Figure 8 shows the total content concentration of arsenic and heavy metal contaminated soil used in a soil culture experiment conducted to verify the risk reduction performance of the magnetite-supported bottom material-based Na-A zeolite prepared according to an embodiment of the present invention. Figure 9 is the result of a TCLP experiment confirming the effect after applying a magnetite-supported bottom material-based Na-A zeolite prepared according to an embodiment of the present invention to complexly contaminated soil. FIG. 10 shows the expected mechanism for stabilizing complexly contaminated soil using a magnetite-supported bottom material-based Na-A zeolite prepared according to an embodiment of the present invention. Specific details for implementing the invention

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, in describing this description, descriptions of already known functions or configurations will be omitted to clarify the gist of this description.

[0028] Meanwhile, the term "bottom ash," used throughout the specification and claims of the present invention, should be understood to mean the ash remaining after excluding fly ash from coal ash generated in an incinerator, and the ash present on the bottom of an ash disposal site such as a thermal power plant.

[0030] As described above, according to the prior art, zeolites widely used as heavy metal adsorbents have excellent reactivity with cationic heavy metals such as lead, copper, and cadmium, but lack reactivity with oxyanions such as trivalent arsenic or pentavalent arsenic, so in order to stabilize heavy metal cations and trivalent arsenic or pentavalent arsenic anions present in contaminated soil or sediment, a separate surface modification had to be performed on the surface of the zeolite.

[0031] Meanwhile, the inventors confirmed through experiments that when zeolite Na-A is manufactured from bottom ash and magnetite particles are supported on zeolite Na-A, not only cationic heavy metals such as lead, copper, and cadmium, but also oxyacid anions such as trivalent or pentavalent arsenic can be simultaneously reduced in wastewater discharged from the chemical industry, thereby enabling the simultaneous purification of soil contaminated with a complex mixture of arsenic anions and heavy metal cations, and that since bottom ash is recycled from industrial waste that is conventionally landfilled, it has excellent effects in terms of securing economic feasibility and preventing environmental pollution, and thus completed the present invention.

[0033] Method for preparing zeolite Na-A supported with magnetite particles

[0034] Specifically, a method for manufacturing a bottom ash-based zeolite stabilizer supported with magnetite particles according to one embodiment of the present invention may include: a) a step of manufacturing zeolite Na-A from bottom ash; and b) a step of supporting magnetite particles on the zeolite Na-A (see FIG. 1 and 4).

[0036] First, zeolite Na-A is prepared from bottom ash (step a).

[0037] In the present invention, bottom ash is the remaining coal ash (or coal ash) generated through an incineration process at a thermal power plant, excluding fly ash. In one embodiment of the present invention, the bottom ash of step a may be prepared by washing bottom ash collected from a thermal power plant with distilled water and a 0.1 M nitric acid solution for 1 hour and drying it for 1 to 3 hours, specifically 2 hours (step a-1).

[0038] Meanwhile, the dried bottom material and sodium hydroxide (NaOH) are introduced into an ignition device, mixed in a weight ratio of 1:1 to 2 parts, specifically 1:1.5 parts, and heated and melted at a temperature range of 500 to 600 ℃, specifically 550 ℃, to extract silicon (Si) and aluminum (Al) from the bottom material (step a-2). In the above process, by mixing the bottom material with sodium hydroxide in the above weight ratio range and heating and melting it at the above temperature range, there may be an advantage in extracting silicon (Si) and aluminum (Al) in a ratio suitable for forming Na-A zeolite.

[0039] Next, the above molten product is mixed with water to prepare an aluminosilicate gel, and sodium aluminate (NaAlO2) is mixed to adjust the molar ratio of silicon (Si) to aluminum (Al) (step a-3). Specifically, when mixing the molten product with distilled water, it is mixed in a weight ratio of 1:5 to 15, more specifically 1:10, and then zeolite Na-A (NaAlO2) with a molar ratio of silicon (Si) to aluminum (Al) of 1:1 is prepared. 12 Al 12 Si 12 O 48· An aluminosilicate gel is prepared by mixing a bottom material and sodium aluminate in a weight ratio of 1:0.1 to 0.5, specifically 1:0.3, to form 27H2O, and stirring for 4 to 8 hours, specifically 6 hours.

[0040] Next, the aluminosilicate gel is placed in a hydrothermal reactor (teflon-lined autoclave) and hydrothermally reacted at a temperature of 90 to 110 °C, specifically 100 °C, for 4 to 8 hours, specifically 6 hours to form bottom-based zeolite Na-A (Na-A zeolite) (step a-4).

[0041] Meanwhile, the zeolite Na-A (Na-A zeolite) produced through the above reaction may be a synthetic zeolite having an 'LTA' structure consisting of an 8-membered ring (8MR) with a diameter of 0.41 nm and six small windows connected to an α-cage with a diameter of 1.14 nm.

[0043] Next, magnetite particles are supported on zeolite Na-A (step b).

[0044] Step b is a step for supporting magnetite (Fe3O4) particles on the surface of zeolite Na-A prepared from the flooring material through Step a above, specifically, the zeolite Na-A is ferrous (Fe3O4). 3+ ) and divalent iron (Fe 2+ ) is dispersed for 1 hour in a solution mixed in a 2:1 molar ratio, and at this time, in order to adjust the weight ratio of zeolite to magnetite (Fe3O4) formed according to the following reaction equation to 1:1, trivalent iron (Fe ) in the solution 3+ ) and divalent iron (Fe 2+ Adjust the concentration of (step b-1).

[0046] (Equation 1)

[0048] Meanwhile, through the above process, trivalent iron and divalent iron are supported on the surface of zeolite Na-A, and when the temperature of these solutions is raised to 70 to 90 ℃, specifically to 80 ℃, and the pH range is adjusted to 9 to 11, specifically to pH 10, iron ions are supported and fixed on the surface of zeolite Na-A in the form of magnetite.

[0050] Zeolite stabilizer supported with magnetite particles

[0051] Meanwhile, a zeolite stabilizer according to one embodiment of the present invention, which can be manufactured through the steps described above, may comprise zeolite Na-A containing a substitutable zeolite cation; and magnetite particles supported on the surface of the zeolite Na-A.

[0052] The above-described zeolite stabilizer can simultaneously stabilize cationic heavy metals such as lead, copper, and cadmium, as well as oxyanions such as trivalent and pentavalent arsenic, in wastewater discharged from the chemical industry. In particular, it can improve the characteristics of zeolites, which exhibit excellent reactivity toward cationic heavy metals but low reactivity toward pollutants existing as anions, such as trivalent and pentavalent arsenic, making it suitable for application to soils contaminated with a complex mixture of arsenic anions and heavy metal cations. Meanwhile, the BET specific surface area of ​​the Na-A zeolite supported with the magnetite particles is 261 m². 2 It can be / g, and the cation exchange capacity can be 242 meq / 100g.

[0054] In addition, the zeolite stabilizer according to one embodiment of the present invention may have a maximum stabilization performance of 38.76 mg / g for trivalent arsenic in water under conditions of an initial trivalent arsenic anion concentration of 5 to 200 mg / L, pH 4, reaction time of 3 hours, stabilizer addition ratio of 0.5 g / L, and ionic strength of 0.01 M NaCl.

[0055] According to another embodiment of the present invention, the zeolite stabilizer may have a maximum stabilization performance of 46.95 mg / g for pentavalent arsenic in water under conditions of an initial pentavalent arsenic anion concentration of 5 to 200 mg / L, pH 4, reaction time of 3 hours, stabilizer input ratio of 0.5 g / L, and ionic strength of 0.01 M NaCl.

[0057] Meanwhile, the zeolite stabilizer according to the present invention as described above is a recycled bottom material that is conventionally landfilled as industrial waste, and can simultaneously stabilize heavy metal cations and trivalent or pentavalent arsenic anions in soil contaminated with a complex of arsenic anions and heavy metal cations, and has excellent stabilization efficiency, so it is advantageous in terms of securing economic feasibility through resource recycling and preventing environmental pollution.

[0059] Examples

[0060] The bottom ash collected from the ash disposal site at Korea Western Power was washed with a 0.1 M HCl solution for 1 hour and then dried at 105 ℃ for 2 hours to complete the washing and drying.

[0061] Next, sodium hydroxide (NaOH) was mixed with the impurity-removed flooring in a ratio of 1:1.5 parts by weight and melted at 550°C for 1 hour using an ignition heater.

[0062] Next, the molten product was ground in a mortar and pestle, and then 10 parts by weight of distilled water and 0.3 parts by weight of sodium aluminate (NaAlO2) were added per 1 part by weight of bottom material, mixed, and stirred for 6 hours to form an aluminosilicate gel.

[0063] Next, the formed aluminosilicate gel was placed in a hydrothermal synthesis reactor (teflon-lined autoclave) and hydrothermally synthesized at 100 °C for 6 hours to produce bottom-material-based zeolite Na-A (Na-A zeolite) (see Fig. 2).

[0064] XRD analysis was performed on the manufactured flooring-based zeolite Na-A, and it was confirmed that while the flooring prior to zeolite synthesis showed crystallinity consisting mostly of quartz or mullite, the manufactured zeolite Na-A had the crystallinity of Na-A zeolite (see Fig. 3).

[0065] Next, to support magnetite particles on the flooring-based zeolite Na-A, the zeolite Na-A is ferrous (Fe₃₅) 3+ ) and divalent iron (Fe 2+ In order to adjust the weight ratio of magnetite formed to 1:1 after dispersing for 1 hour in 500 mL of an aqueous solution mixed at a ratio of 2:1 (mol / mol), trivalent iron (Fe) in the solution 3+) and divalent iron (Fe 2+ The concentration of ) was adjusted.

[0066] Next, the concentration of the solution was raised to 80 °C, and then the pH was adjusted to 10 using 5 M NaOH to convert the trivalent and divalent iron supported on the surface of the bottom-based Na-A zeolite into magnetite (see Fig. 6).

[0068] [Experiment 1: Analysis of Specific Surface Area and Cation Exchange Capacity of Flooring Material and Zeolite Na-A]

[0069] The specific surface area and cation exchange capacity (CEC) of the flooring-based zeolite Na-A prepared according to the process of Example 1 were analyzed. The zeolite Na-A prepared from the flooring (Na-A zeolite) had a BET specific surface area of ​​261 m². 2 / g, and the cation exchange capacity was 242 meq / 100g, confirming that it possesses a higher BET specific surface area and cation exchange capacity (CEC) compared to bottom materials. Therefore, it was confirmed that it is suitable for the simultaneous stabilization of arsenic anions and heavy metal cations in contaminated soil.

[0071] [Experiment 2: Measurement of Stabilization Efficiency for Trivalent and Pentavalent Arsenic and Lead (Pb) in Water According to Magnetite Particle Loading Ratio of Bottom Material-Based Zeolite Na-A]

[0072] To confirm the stabilization performance of the magnetite particle-supported zeolite obtained through the process of Example 1 above against trivalent arsenic, pentavalent arsenic, and lead (Pb), a batch adsorption experiment was conducted (initial arsenic (As) concentration = 20 ~ 500 mg / L, pH = 4, reaction time = 3 hours, stabilizer addition ratio 0.5 (trivalent and pentavalent arsenic), 0.1 (lead) g / L, ionic strength = 0.01 M NaCl).

[0073] Referring to the results in Figure 7, it was confirmed that the stabilization efficiency for lead (Pb) was excellent for the bottom material-based Na-A zeolite prior to magnetite loading, but the stabilization efficiency for trivalent arsenic and pentavalent arsenic anions was insufficient. However, it was confirmed that the stabilization efficiency for trivalent arsenic and pentavalent arsenic anions increased as the magnetite loading ratio increased.

[0075] [Experiment 3: TCLP Experiment]

[0076] To verify the stabilization efficiency of arsenic anions and heavy metal cations of the magnetite particle-supported zeolite obtained through the process of Example 1 above, soil contaminated with a complex mixture of arsenic and heavy metal cations collected from the vicinity of the Seokpo Smelter was prepared (see Fig. 8). Then, the magnetite particle-supported bottom material-based Na-A zeolite according to the example was added to the soil at 5% (w / w) relative to the weight of the complex contaminated soil, mixed homogeneously, and adjusted to a moisture content of 15%. Subsequently, the soil was cultured under dark conditions for 2 weeks, and leaching was performed using the USEPA's TCLP (toxicity characteristic leaching procedure) test method to confirm the stabilization effect.

[0077] Referring to the results in Figure 9, regarding the concentrations of arsenic and heavy metals in the TCLP eluent before and after stabilization treatment, it was confirmed that the concentration of arsenic was reduced to an undetectable level after stabilization treatment, and the concentration of cationic heavy metals was also reduced by 26.28 to 81.51%.

[0078] Interpreting the results, it was confirmed that Na-A zeolite based on magnetite particle-supported substrate possesses a risk reduction effect through the stabilization of soil contaminated with arsenic and heavy metals, and that simultaneous stabilization of arsenic and heavy metals is possible. As shown in Figure 10, this is interpreted as the simultaneous stabilization of arsenic anions and cationic heavy metals being made possible by the simultaneous expression of the chemical adsorption and iron-arsenic co-precipitation mechanisms of magnetite, along with the cation exchange capacity and alkali precipitation mechanism of Na-A zeolite.

[0080] Although specific embodiments of the present invention have been described and illustrated above, it is obvious to those skilled in the art that the present invention is not limited to the described embodiments and can be modified and varied in various ways without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations should not be understood individually from the technical spirit or perspective of the present invention, and the modified embodiments should be considered to fall within the scope of the claims of the present invention.

Claims

Claim 1 a) a step of preparing zeolite Na-A from bottom ash; b-1) the zeolite Na-A prepared in step a above, trivalent iron (Fe 3+ ) and divalent iron (Fe 2+ A method for manufacturing a zeolite stabilizer comprising: a step of adding to a solution mixed in a 2:1 molar ratio so that iron ions are supported on the surface of zeolite Na-A particles; and b-2) a step of raising the temperature of the solution of b-1 to 70 to 90 ℃, adjusting the pH range to 9 to 11, and then supporting iron ions on the surface of zeolite Na-A in the form of magnetite (Fe3O4) particles (b-2); wherein the stabilizer produced through the above steps simultaneously stabilizes cationic heavy metals and trivalent and pentavalent arsenic anions in soil contaminated with a complex mixture of heavy metal cations and arsenic anions. Claim 2 A method for manufacturing a zeolite stabilizer according to claim 1, wherein step a further comprises the step of washing and drying the flooring material with distilled water and a 0.1 M nitric acid solution (a-1). Claim 3 A method for manufacturing a zeolite stabilizer according to claim 2, wherein step a comprises mixing a dried flooring material with sodium hydroxide (NaOH) in a weight ratio of 1:1 to 2 parts and melting it in a temperature range of 500 to 600 ℃ to leach silicon (Si) and aluminum (Al) from the flooring material (a-2). Claim 4 A method for manufacturing a zeolite stabilizer according to claim 3, wherein step a further comprises the step (a-3) of mixing the molten product with water to produce an aluminosilicate gel and mixing sodium aluminate (NaAlO2) to adjust the molar ratio of silicon (Si) and aluminum (Al). Claim 5 A method for manufacturing a zeolite stabilizer according to claim 4, wherein step a comprises a step of forming zeolite Na-A by hydrothermal reaction of the aluminosilicate gel at a temperature range of 90 to 110 ℃ for 4 to 8 hours (a-4). Claim 6 delete Claim 7 delete Claim 8 A zeolite stabilizer comprising: zeolite Na-A, which is manufactured by the method of claim 1 and contains exchangeable cations; and magnetite (Fe3O4) particles supported on the surface of said zeolite Na-A; wherein the stabilizer simultaneously stabilizes soil contaminated with a combination of cationic heavy metals and arsenic by using a cation exchange method for one cationic heavy metal selected from the group consisting of lead, copper, cadmium, and combinations thereof, and an iron-arsenic co-precipitation mechanism for one arsenic anion selected from trivalent arsenic, pentavalent arsenic, and combinations thereof. Claim 9 In claim 8, the BET specific surface area of ​​the zeolite Na-A supported with the magnetite particles is 261 m² 2 / g phosphorus, zeolite stabilizer. Claim 10 In claim 8, the zeolite stabilizer having a cation exchange capacity of zeolite Na-A supported with magnetite particles of 242 meq / 100g. Claim 11 In claim 8, the zeolite stabilizer is a zeolite stabilizer having a maximum stabilization performance of 38.76 mg / g for trivalent arsenic in water under conditions of an initial trivalent arsenic anion concentration of 5 to 200 mg / L, pH 4, reaction time of 3 hours, stabilizer addition ratio of 0.5 g / L, and ionic strength of 0.01 M NaCl. Claim 12 In claim 8, the zeolite stabilizer is a zeolite stabilizer having a maximum stabilization performance of 46.95 mg / g for pentavalent arsenic in water under conditions of an initial pentavalent arsenic anion concentration of 5 to 200 mg / L, pH 4, reaction time of 3 hours, stabilizer addition ratio of 0.5 g / L, and ionic strength of 0.01 M NaCl.

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