A method of stabilizing heavy metals in a sulphur-containing tailings

Abstract

The application provides a heavy metal stabilization method for sulfur-containing tailings, and belongs to the technical field of heavy metal pollution remediation. The method provided by the application comprises the following steps: mixing sulfur-containing tailings with a stabilizer to obtain a mixture; the OCP value of the stabilizer is lower than the OCP value of metal carrier sulfide minerals in the sulfur-containing tailings; after the mixture is leached with an ethanol solution, curing is performed to obtain stabilized sulfur-containing tailings. The method provided by the application is based on the original battery effect, realizes the stabilization of heavy metals in the sulfur-containing tailings in the form of sacrificing anode, and combines the quenching of free radicals by the ethanol solution leaching, thereby significantly improving the stabilization effect of heavy metals in the sulfur-containing tailings. The results of the examples show that the stabilization rate of lead in the sulfur-containing tailings can reach more than 79.1% by the method provided by the application, the stabilization rate of cadmium can reach more than 14.7%, and the method has excellent stabilization effect on lead and cadmium in the sulfur-containing tailings.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heavy metal pollution remediation, and particularly relates to a heavy metal stabilization method for sulfur-containing tailings. BACKGROUND

[0002] Common non-ferrous metal mineral types mainly include galena, sphalerite, arsenopyrite, pyrite, etc. After non-ferrous metal mineral mining and beneficiation, a variety of metal minerals are left in the tailings, such as galena, sphalerite, cadmium-containing sphalerite, arsenopyrite and arsenic-sulfur-containing pyrite, etc. As a release source, the metal carrier sulfide mineral in the tailings will be released due to the joint action of water and oxygen during the disposal process of the tailings through tailings storage, dry stacking and other storage methods, resulting in the oxidation and dissolution of heavy metals and the pollution of the surrounding soil and water in the mining area, causing serious ecological and environmental problems. Therefore, it is of great significance to stabilize the heavy metals in the sulfur-containing tailings.

[0003] At present, the method for stabilizing the sulfur-containing tailings is mainly based on the principle of re-stabilizing the released heavy metals. For example, the related prior art discloses a method for using boiler ash as the main raw material, adding a small amount of or no alkali activator, and combining the boiler ash with the nickel tailings in the cementation process to realize the solidification and stabilization of the heavy metals. However, the heavy metal stabilization effect of this method is not ideal, and there is a risk of re-release after stabilization.

[0004] Therefore, there is an urgent need to provide a heavy metal stabilization method for sulfur-containing tailings, which has excellent stabilization effect and low risk of heavy metal release. SUMMARY

[0005] The present application relates to the technical field of heavy metal pollution remediation, and particularly relates to a heavy metal stabilization method for sulfur-containing tailings.

[0006] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0007] The present application provides a heavy metal stabilization method for sulfur-containing tailings, comprising the following steps:

[0008] (1) mixing the sulfur-containing tailings with a stabilizer to obtain a mixture; the OCP value of the stabilizer is lower than the OCP value of the metal carrier sulfide mineral of the sulfur-containing tailings;

[0009] (2) using an ethanol solution to leach the mixture obtained in step (1), and then curing to obtain stabilized sulfur-containing tailings.

[0010] Preferably, the metal carrier sulfide mineral in the sulfur-containing tailings in step (1) includes one or more of galena, sphalerite, chalcopyrite, stibnite, wurtzite and arsenopyrite.

[0011] Preferably, the particle size of the sulfur-containing tailings is 5-400 mesh.

[0012] Preferably, the stabilizer in step (1) comprises one or more of zero-valent iron, manganese sulfide, magnesium alloy powder and aluminum alloy powder.

[0013] Preferably, the stabilizer in step (1) accounts for 1-7% of the mass percentage of the sulfur-containing tailings.

[0014] Preferably, before mixing the sulfur-containing tailings with the stabilizer, the stabilizer is pretreated, and the pretreatment method comprises crushing and sieving in sequence.

[0015] Preferably, the OCP value of the stabilizer or the OCP value of the sulfur-containing tailings in step (1) is tested by using the OCP measurement mode of an electrochemical workstation, and the metal carrier sulfide mineral of the stabilizer or the sulfur-containing tailings is adhered to the working electrode of the electrochemical workstation.

[0016] Preferably, the electrolyte of the electrochemical workstation is a potassium nitrate solution or a sulfur-containing tailings leaching solution.

[0017] Preferably, the concentration of the potassium nitrate solution is 1-100 mmol / L, and the pH value of the potassium nitrate solution is 2-7.

[0018] Preferably, the temperature of the curing in step (2) is 15-35℃, and the air humidity of the curing is ≥30%.

[0019] The application provides a heavy metal stabilization method of sulfur-containing tailings, comprising the following steps: mixing the sulfur-containing tailings with a stabilizer to obtain a mixture; the OCP value of the stabilizer is lower than the OCP value of the metal carrier sulfide mineral of the sulfur-containing tailings; after the mixture is leached with an ethanol solution, curing is performed to obtain stabilized sulfur-containing tailings. The OCP value of the stabilizer used in the application is lower than the OCP value of the metal carrier sulfide mineral in the sulfur-containing tailings. Since the sulfur-containing tailings contain different metal sulfides, when different types of metal sulfides share the grain boundaries or coexist in the tailings, they can transfer electrons without obstacles. In the "primary battery" formed by the coexisting metal sulfides, the stabilizable agent with a lower open circuit potential (OCP) acts as an anode and is more likely to be oxidized and dissolved; the heavy metals in the sulfur-containing tailings are protected as cathodes and are not easy to dissolve and release, thereby realizing the stabilization of the heavy metals in the sulfur-containing tailings. The application uses ethanol solution to leach and cure the mixture. The ethanol solution leaching can quench the free radicals generated in the oxidation process of the metal carrier sulfide mineral, thereby reducing the oxidation and dissolution of the heavy metals in the sulfur-containing tailings. Therefore, the method provided by the application realizes the stabilization of the heavy metals in the sulfur-containing tailings by sacrificing the anode based on the primary battery effect, and combines the quenching of free radicals by ethanol solution leaching, thereby significantly improving the stabilization effect of the heavy metals in the sulfur-containing tailings. The results of the examples show that the stabilization rate of lead in the sulfur-containing tailings can reach more than 79.1% by the method provided by the application, and the stabilization rate of cadmium can reach more than 14.7%, which has excellent stabilization effect on lead and cadmium in the sulfur-containing tailings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A flowchart of the heavy metal stabilization method of sulfur-containing tailings provided by the application is shown in the figure.

[0021] Figure 2 The XRD graph of the sulfur-containing tailings used in the examples of the application is shown in the figure.

[0022] Figure 3 The stabilization results of Pd of the methods of examples 1-2 and untreated sulfur-containing tailings are shown in the figure.

[0023] Figure 4 The stabilization results of Cd of the methods of examples 1-2 and untreated sulfur-containing tailings are shown in the figure. DETAILED DESCRIPTION

[0024] The application provides a heavy metal stabilization method of sulfur-containing tailings, comprising the following steps:

[0025] (1) mixing the sulfur-containing tailings with a stabilizer to obtain a mixture; the OCP value of the stabilizer is lower than the OCP value of the metal carrier sulfide mineral of the sulfur-containing tailings;

[0026] (2) using an ethanol solution to elute the mixture obtained in step (1), and then curing to obtain stable sulfur-containing tailings.

[0027] The sulfur-containing tailings are mixed with a stabilizer to obtain a mixture.

[0028] The sulfur-containing tailings used in the present application are not specifically limited, and the method of the present application can be widely applied to sulfur-containing tailings that can be obtained by those skilled in the art. In the present application, the metal carrier sulfide mineral in the sulfur-containing tailings preferably includes one or more of galena, sphalerite, chalcopyrite, stibnite, wurtzite, and arsenopyrite, and more preferably galena or sphalerite. The sulfur-containing tailings used in the present application include one or more metal elements of lead, cadmium, arsenic, and zinc. In the embodiments of the present application, the sulfur-containing tailings can be tailings samples from lead-zinc metal mining areas in Guangxi.

[0029] The sulfur-containing tailings are preferably air-dried first. The air-drying can eliminate the problem of inaccurate control of the mass of the sulfur-containing tailings and the stabilizer due to different water contents of the sulfur-containing tailings, and is more conducive to uniform mixing of the components. In the present application, the water content of the sulfur-containing tailings is preferably ≤20%.

[0030] In the present application, the particle size of the sulfur-containing tailings is preferably 5-400 mesh, and more preferably 100-300 mesh. Controlling the particle size of the sulfur-containing tailings in the above range is more conducive to uniform mixing of the sulfur-containing tailings and the stabilizer.

[0031] In the present application, the stabilizer preferably includes one or more of zero-valent iron, manganese sulfide, magnesium alloy powder, and aluminum alloy powder, and more preferably zero-valent iron or manganese sulfide. The use of the above stabilizers has the advantages of being inexpensive and easy to obtain, and having a low OCP value, which can expand the selection range of the sulfur-containing tailings.

[0032] In the present application, the stabilizer is preferably pretreated before being mixed with the sulfur-containing tailings. The pretreatment method preferably includes crushing and sieving in sequence. The grinding, crushing, and sieving methods are not specifically limited, and conventional methods can be used. In the embodiments of the present application, the crushing method is preferably grinding. Grinding and sieving can destroy the oxide or passivation film on the surface of the stabilizer, and fully expose the conductive surface of the stabilizer.

[0033] In the present application, the particle size of the stabilizer is preferably 50-200 mesh, and more preferably 100 mesh. Controlling the particle size of the stabilizer in the above range is more conducive to uniform mixing with the sulfur-containing tailings.

[0034] In the present application, the mass percentage of the stabilizer in the sulfur-containing tailings is preferably 1-7%, more preferably 3-5%. Controlling the amount of the stabilizer in the above range can achieve good stabilizing effect on the sulfur-containing tailings and can meet the requirement that heavy metal ions are not released after long-term stacking.

[0035] In the present application, the OCP value of the stabilizer is lower than the OCP value of the metal carrier sulfide mineral in the sulfur-containing tailings. In the present application, the sulfur-containing tailings are the product after smelting of the metal carrier sulfide mineral, and the metal content is relatively low. The OCP value of the sulfur-containing tailings can be obtained by measuring the OCP value of the metal carrier sulfide mineral in the sulfur-containing tailings. Controlling the OCP value of the stabilizer to be lower than the OCP value of the metal carrier sulfide mineral in the sulfur-containing tailings can select appropriate stabilizers according to different sulfur-containing tailings, and then realize the stabilization of heavy metals in the sulfur-containing tailings by using the galvanic effect.

[0036] In the present application, the OCP value of the stabilizer or the OCP value of the metal carrier sulfide mineral in the sulfur-containing tailings is preferably tested by using the OCP measurement mode of an electrochemical workstation, and the stabilizer or the metal carrier sulfide mineral in the sulfur-containing tailings is adhered to the working electrode of the electrochemical workstation.

[0037] The present application does not have special limitations on the specific amount of the stabilizer or the metal carrier sulfide mineral in the sulfur-containing tailings adhered to the working electrode, and the same contact area of the stabilizer or the metal carrier sulfide mineral in the sulfur-containing tailings with the electrolyte can be ensured. In the embodiments of the present application, the method of adhering the stabilizer or the metal carrier sulfide mineral in the sulfur-containing tailings to the working electrode can be as follows: uniformly spreading the stabilizer or the metal carrier sulfide mineral in the sulfur-containing tailings on a 2cm×3cm conductive carbon paper, adhering the sample to the conductive carbon paper by using a Nafion film solution, and drying to form the working electrode.

[0038] In the present application, the electrolyte of the electrochemical workstation is preferably a potassium nitrate solution, and the concentration of the potassium nitrate solution is preferably 1-100mmol / L, more preferably 5-50mmol / L, and further preferably 6-10mmol / L; the pH value of the potassium nitrate solution is preferably 2-7, and more preferably 3-5. Using the potassium nitrate solution with the above concentration and pH value as the electrolyte can make the ionic strength close to the leaching solution of the metal carrier sulfide mineral in the sulfur-containing tailings, so that the OCP value of the stabilizer or the OCP value of the metal carrier sulfide mineral in the sulfur-containing tailings can be accurately measured when the above parameters are in the above range.

[0039] In the present application, the preparation method of the sulfur-containing tailing leaching solution preferably comprises: soaking the metal carrier sulfide mineral of the sulfur-containing tailing in water to obtain a metal carrier sulfide mineral leaching solution of the sulfur-containing tailing. The present application does not have special limitations on the amount of the metal carrier sulfide mineral of the sulfur-containing tailing and water, which can be adjusted as needed.

[0040] The present application does not have special limitations on the operation method for testing the OCP determination mode of the electrochemical workstation, which can be performed using a conventional operation method. In the embodiments of the present application, the operation method for testing the OCP determination mode of the electrochemical workstation can be as follows: a traditional three-electrode electrolytic cell is used, and the working electrode, auxiliary electrode and reference electrode are respectively the working electrode of the adhesion stabilizer or the metal carrier sulfide mineral of the sulfur-containing tailing, a platinum electrode and a saturated calomel electrode; the electrochemical test conditions are 25±2℃, and a glass reactor with a capacity of 100mL is used as the electrolytic cell for electrochemical reaction testing; the working electrode is placed in 50mL of electrolyte solution, and the open circuit potential (OCP) of the sample is determined by the electrochemical workstation under the condition that the sampling interval is 0.1s.

[0041] The present application does not have special limitations on the method for mixing the sulfur-containing tailing and the stabilizer, which can be uniformly mixed. In the present application, the method for mixing the sulfur-containing tailing and the stabilizer is preferably stirring, the stirring speed is preferably 20-100r / min, and more preferably 30-60r / min; and the stirring time is preferably 1-4h, and more preferably 2-4h. The present application can promote the uniform mixing of the sulfur-containing tailing and the stabilizer through stirring.

[0042] After obtaining the mixture, the present application uses an ethanol solution to leach the mixture, and then cures to obtain the stabilized sulfur-containing tailing.

[0043] In the present application, the volume concentration of the ethanol solution is preferably 5-25%, and more preferably 10-20%. The use of the above concentration of ethanol solution in the present application can quench the free radicals generated in the oxidation process of the sulfide mineral, and also has a lower use cost.

[0044] In the present application, the leaching frequency is preferably 1-3 times, and more preferably 2-3 times. The leaching with the ethanol solution in the present application can quench the free radicals generated in the oxidation process of the sulfide mineral, thereby reducing the oxidation and dissolution of heavy metals in the sulfur-containing tailing and improving the stabilization effect on heavy metals. The present application does not have special limitations on the leaching method, which can be performed using a conventional leaching method.

[0045] In the present application, the temperature of the curing is preferably 15-35 DEG C, more preferably 25 DEG C; the air humidity of the curing is preferably > 30%, more preferably > 95%. The present application does not have special limitation on the time of the curing, which can be adjusted according to the amount of the mixture. In the present application, the time of the curing is preferably > 28 days. The present application can fully quench the free radicals generated in the oxidation process of the sulfide minerals through the curing.

[0046] The flowchart of the method provided by the present application is preferably as shown in Figure 1 It can be seen from Figure 1 that, in the present application, the OCP of the stabilizer and the metal carrier sulfide minerals in the sulfur-containing tailings is obtained by first determining the tailings components (metal carrier sulfide minerals in the sulfur-containing tailings) and the crushed and sieved stabilizer, the OCP value of the stabilizer is controlled to be lower than the OCP of the metal carrier sulfide minerals in the sulfur-containing tailings, the sulfur-containing tailings is mixed with the stabilizer, and after the mixture is mixed and leached with an ethanol solution and cured, the stabilized sulfur-containing tailings can be obtained, which can be then disposed by stacking and the like. The OCP value of the stabilizer used in the method provided by the present application is lower than the OCP value of the metal carrier sulfide minerals in the sulfur-containing tailings, the heavy metals in the sulfur-containing tailings are stabilized by the way of sacrificing anode through the galvanic effect, and the quenching of the free radicals by the ethanol solution leaching can further significantly improve the stabilization effect of the heavy metals in the sulfur-containing tailings.

[0047] The technical solutions in the present application will be clearly and completely described in combination with the embodiments in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0048] The sulfur-containing tailings and the metal carrier sulfide minerals in the sulfur-containing tailings used in the embodiments of the present application are: the metal carrier sulfide mineral samples and the corresponding tailings collected from the lead-zinc metal mining area in Guangxi are subjected to air-drying treatment and sieving (100 mesh) to obtain the metal carrier sulfide minerals and the sulfur-containing tailings, and the XRD of the metal carrier sulfide minerals and the sulfur-containing tailings is as shown in Figure 2 It can be seen from Figure 2 that the main types of the heavy metal carrier minerals used in the present application are galena and sphalerite, and the main heavy metal pollutants in the sulfur-containing tailings are lead and cadmium.

[0049] The pretreatment of the stabilizer (zero-valent iron or manganese sulfide) used in the embodiments of the present application is: grinding and sieving through a 100-mesh sieve.

[0050] Embodiment 1

[0051] A heavy metal stabilization method for sulfur-containing tailings, the steps are:

[0052] (1) Galena tailings (100 mesh) and zero-valent iron (100 mesh) were mixed in a blender at a speed of 30 r / min for 4 h at a ratio of 5% of the stabilizer to the mass percentage of the sulfur-containing tailings to obtain a mixture;

[0053] 50 mg of galena and 50 mg of zero-valent iron were respectively adhered to conductive carbon paper to obtain working electrodes, and then a KNO3 solution with a pH of 3 and a concentration of 6 mmol / L was prepared and used as an electrolyte solution to carry out electrochemical experiments. A conventional three-electrode electrolytic cell was used, and the above working electrodes, platinum electrodes and saturated calomel electrodes were used as working electrodes, auxiliary electrodes and reference electrodes, respectively. The electrochemical test conditions were 25±2℃, and a glass reactor with a capacity of 100 mL was used as the electrolytic cell for electrochemical reaction testing. The working electrode was placed in 50 mL of electrolyte solution, and the open circuit potential (OCP) of the sample was measured at a sampling interval of 0.1 s using an electrochemical workstation to obtain the OCP values of the zero-valent iron and the galena, and the results are shown in Table 1. As shown in Table 1, the OCP value of the zero-valent iron is lower than that of the galena;

[0054] (2) The mixture obtained in step (1) was leached 3 times with an ethanol solution with a concentration of 20%, and then placed in a constant temperature and humidity box (25℃, humidity > 95%) for 28 days to obtain a stabilized sulfur-containing tailings.

[0055] Example 2

[0056] A method for stabilizing heavy metals in sulfur-containing tailings, comprising the following steps:

[0057] (1) Galena tailings (100 mesh) and manganese sulfide (100 mesh) were mixed in a blender at a speed of 30 r / min for 4 h at a ratio of 5% of the stabilizer to the mass percentage of the sulfur-containing tailings to obtain a mixture;

[0058] The OCP values of the manganese sulfide and the galena were obtained according to the method of Example 1, and the results are shown in Table 1. As shown in Table 1, the OCP value of the manganese sulfide is lower than that of the galena;

[0059] (2) The mixture obtained in step (1) was leached 3 times with an ethanol solution with a concentration of 20%, and then placed in a constant temperature and humidity box (25℃, humidity > 95%) for 28 days to obtain a stabilized sulfur-containing tailings.

[0060] Example 3

[0061] A method for stabilizing heavy metals in sulfur-containing tailings, comprising the following steps:

[0062] (1) The sphalerite tailings (100 mesh) and zero-valent iron (100 mesh) were mixed in a blender at a speed of 30 r / min for 4 h, with the stabilizer accounting for 5% of the mass percentage of the sulfur-containing tailings, to obtain a mixture;

[0063] The OCP values of the zero-valent iron and the sphalerite were obtained according to the method of Example 1, and the results are shown in Table 1; as shown in Table 1, the OCP value of the zero-valent iron is lower than that of the sphalerite;

[0064] (2) The mixture obtained in step (1) was leached 3 times with an ethanol solution with a concentration of 20%, and then placed in a constant temperature and humidity box (25℃, humidity > 95%) for 28 days of curing to obtain the stabilized sulfur-containing tailings.

[0065] Example 4

[0066] A method for stabilizing heavy metals in sulfur-containing tailings, comprising the following steps:

[0067] (1) The sphalerite tailings (100 mesh) and manganese sulfide (100 mesh) were mixed in a blender at a speed of 30 r / min for 4 h, with the stabilizer accounting for 5% of the mass percentage of the sulfur-containing tailings, to obtain a mixture;

[0068] The OCP values of the manganese sulfide and the sphalerite were obtained according to the method of Example 1, and the results are shown in Table 1; as shown in Table 1, the OCP value of the manganese sulfide is lower than that of the sphalerite;

[0069] (2) The mixture obtained in step (1) was leached 3 times with an ethanol solution with a concentration of 20%, and then placed in a constant temperature and humidity box (25℃, humidity > 95%) for 28 days of curing to obtain the stabilized sulfur-containing tailings.

[0070] Test Example

[0071] The open circuit potentials of the sulfur tailings and the stabilizers in Examples 1-4 are shown in Table 1:

[0072] Table 1 Open circuit potentials of sulfur tailings and stabilizers in Examples 1-4

[0073] Material Open circuit potential (mV) Zero-valent iron -279 Manganese sulphide -148 Galenite 122 Fluorite 126

[0074] According to the method of "Solid Waste Leaching Toxicity Leaching Method Acetate Buffer Solution Method" (HJ / T 300-2007), the heavy metal concentrations of the stabilized sulfur-containing tailings treated by the methods of Examples 1-2 and the sulfur-containing tailings treated with the stabilizer (control group) during the curing process were determined, and samples were taken for testing at 0 days, 7 days, 14 days, 21 days and 28 days, respectively. The stabilization results for Pd are shown in Table 2, and the stabilization results for Cd are shown in Table 3. Figure 3 Figure 4 From the results shown in Tables 2 and 3, it can be seen that the heavy metal concentrations of the sulfur-containing tailings treated by the methods of Examples 1-2 are significantly lower than those of the control group, indicating that the methods of Examples 1-2 can effectively stabilize the heavy metals in the sulfur-containing tailings.​Figure 3 and Figure 4 It can be seen that, compared with untreated tailings, the stability rates of lead reached 97.9% and 79.1% respectively by using stabilizer 1 (zero-valent iron) and stabilizer 2 (manganese sulfide), and the stability rates of cadmium reached 22.4% and 14.7% respectively by using stabilizer 1 and stabilizer 2.

[0075] It can be seen from the above results that the method provided by the present application has excellent stability effect on lead and cadmium. This is because the OCP value of the stabilizer used in the method provided by the present application is lower than the OCP value of the sulfur-containing tailings, and the stability of the heavy metals in the sulfur-containing tailings is realized by sacrificing the anode through the use of the original battery effect, and combined with the quenching of free radicals by ethanol solution leaching, the stability effect of the heavy metals in the sulfur-containing tailings can be significantly improved.

[0076] The above only describes the preferred embodiments of the present application, and it should be noted 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 the protection scope of the present application.

Claims

1.A method for stabilizing heavy metals in sulfur-containing tailings, comprising the following steps: (1) mixing the sulfur-containing tailings with a stabilizer to obtain a mixture, wherein the OCP value of the stabilizer is lower than that of the metal carrier sulfide minerals in the sulfur-containing tailings; (2) leaching the mixture obtained in step (1) with an ethanol solution, and then curing to obtain stabilized sulfur-containing tailings; wherein the metal carrier sulfide minerals in the sulfur-containing tailings in step (1) comprise one or more of galena, sphalerite, chalcopyrite, stibnite, wurtzite and arsenopyrite; the stabilizer in step (1) comprises one or more of zero-valent iron, manganese sulfide, magnesium alloy powder and aluminum alloy powder; the OCP value of the stabilizer or the OCP value of the sulfur-containing tailings in step (1) is tested by an OCP measurement mode of an electrochemical workstation, wherein the working electrode of the electrochemical workstation is adhered with the metal carrier sulfide minerals of the stabilizer or the sulfur-containing tailings; the electrolyte of the electrochemical workstation is a potassium nitrate solution or a sulfur-containing tailings leaching solution; the concentration of the potassium nitrate solution is 1-100 mmol / L, and the pH value of the potassium nitrate solution is 2-7; the OCP value of the stabilizer used is lower than that of the metal carrier sulfide minerals in the sulfur-containing tailings, and since the sulfur-containing tailings contain different metal sulfides, when different types of metal sulfides share the crystal boundary or coexist in the tailings, they can transfer electrons without obstacles, and in the "primary battery" formed by the coexisting metal sulfides, the stabilizer with a lower open circuit potential acts as an anode and is more likely to be oxidized and dissolved; the heavy metals in the sulfur-containing tailings are protected as cathodes and are not easy to dissolve and release, thereby achieving the stabilization of the heavy metals in the sulfur-containing tailings; the mixture is leached with an ethanol solution and cured, and the ethanol solution leaching can quench the free radicals generated in the oxidation process of the metal carrier sulfide minerals, thereby reducing the oxidation and dissolution of the heavy metals in the sulfur-containing tailings; the particle size of the sulfur-containing tailings is 5-400 mesh; before the sulfur-containing tailings are mixed with the stabilizer, the stabilizer is pretreated, and the pretreatment method comprises breaking and sieving in sequence; the mass percentage of the stabilizer in the sulfur-containing tailings in step (1) is 1-7%; the curing temperature in step (2) is 15-35℃, and the air humidity during curing is ≥30%. ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The method of claim 1, wherein, ​ 3. The method of claim 1, wherein, ​ 4. The method of claim 1, wherein, ​ 5. The method of claim 1, wherein, ​

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