Heavy metal stabilization method for sulfur-containing tailings

Abstract

The invention 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 invention comprises the following steps: mixing the sulfur-containing tailings with a stabilizer to obtain a mixed material; the OCP value of the stabilizer is lower than that of metal carrier sulfide minerals in the sulfur-containing tailings; and after the mixed material is leached with an ethanol solution, maintenance is conducted, and the stable sulfur-containing tailings are obtained. According to the method provided by the invention, based on the primary battery effect, the stabilization of the heavy metals in the sulfur-containing tailings is realized in a sacrificial anode manner, and the stabilization effect of the heavy metals in the sulfur-containing tailings can be remarkably improved by combining with quenching of free radicals by leaching of the ethanol solution. The result of the embodiment shows that the stabilization rate of lead in the sulfur-containing tailings can reach 79.1% or above, the stabilization rate of cadmium in the sulfur-containing tailings can reach 14.7% or above, and the method has an excellent stabilization effect on lead and cadmium in the sulfur-containing tailings.

Description

Technical Field

[0001] The invention relates to the technical field of heavy metal pollution remediation, and in particular to a heavy metal stabilization method for sulfur-containing tailings. Background Art

[0002] Common types of non-ferrous metal minerals mainly include galena, sphalerite, arsenopyrite, pyrite, etc. There are many metal minerals remaining in the tailings after mining and beneficiation of non-ferrous metal minerals, such as galena, sphalerite, sphalerite containing cadmium, arsenopyrite, and arsenic- and sulfur-containing pyrite. The metal carrier sulfide minerals in the tailings are used as release sources in the natural environment through tailings ponds, dry piles and other storage methods. Due to the combined effects of water and oxygen, heavy metals will be oxidized and dissolved and released, polluting the soil and water around the mining area, causing serious ecological and environmental problems. Therefore, it is of great significance to stabilize the heavy metals in sulfur-containing tailings.

[0003] At present, the method of stabilizing sulfur-containing tailings is mainly based on the principle of re-stabilizing the released heavy metals. For example, the related prior art discloses that boiler ash is used as the main raw material, and by adding a small amount or no alkaline activator, the boiler ash is combined with the nickel tailings during the gelation process to achieve the solidification and stabilization of heavy metals. However, the heavy metal stabilization effect of this method is not ideal, and there is also 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 with excellent stabilization effect and low risk of heavy metal release. Summary of the invention

[0005] The object of the present invention is to provide a heavy metal stabilization method for sulfur-containing tailings with excellent stabilization effect and low risk of heavy metal release.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a method for stabilizing heavy metals in sulfur-containing tailings, comprising the following steps:

[0008] (1) mixing the sulfur-containing tailings with a stabilizer to obtain a mixed material; 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) The mixed material obtained in step (1) is washed with an ethanol solution and then cured to obtain a stable sulfur-containing tailings.

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

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

[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, in step (1), the mass percentage of the stabilizer to the sulfur-containing tailings is 1-7%.

[0014] Preferably, before the sulfur-containing tailings are mixed with the stabilizer, the stabilizer is pretreated, and the pretreatment method includes crushing and screening in sequence.

[0015] Preferably, the OCP value of the stabilizer or the OCP value of the sulfur-containing tailings in step (1) is tested using the OCP determination 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 potassium nitrate solution or sulfur-containing tailings leachate.

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

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

[0019] The invention provides a heavy metal stabilization method for sulfur-containing tailings, comprising the following steps: mixing the sulfur-containing tailings with a stabilizer to obtain a mixed material; the OCP value of the stabilizer is lower than the OCP value of the metal carrier sulfide mineral of the sulfur-containing tailings; and eluting the mixed material with an ethanol solution and then curing to obtain a stable sulfur-containing tailings. The OCP value of the stabilizer used in the present invention 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 grain boundaries or coexist in the tailings, they can perform barrier-free electron transfer. In the "galvanic cell" formed by the coexisting metal sulfides, the stabilizer with a lower open circuit potential (OCP) acts as an anode, which is more easily oxidized and dissolved; the heavy metals in the sulfur-containing tailings are protected as cathodes, not easy to dissolve and release, and thus the stabilization of the heavy metals in the sulfur-containing tailings can be achieved; the present invention utilizes ethanol solution to leach and maintain the mixed material, and the ethanol solution elution can quench the free radicals generated during the oxidation of the metal carrier sulfide minerals, thereby reducing the oxidation and dissolution of the heavy metals in the sulfur-containing tailings. Therefore, the method provided by the present invention is based on the galvanic cell effect, and the stabilization of the heavy metals in the sulfur-containing tailings is achieved by sacrificial anode, and combined with the quenching of free radicals by ethanol solution elution, thereby significantly improving the stabilization effect of the heavy metals in the sulfur-containing tailings. The results of the embodiments show that the method provided by the present invention can achieve a stabilization rate of lead of more than 79.1% and a stabilization rate of cadmium of more than 14.7% in sulfur-containing tailings, and has an excellent stabilization effect on lead and cadmium in sulfur-containing tailings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic flow diagram of a heavy metal stabilization method for sulfur-containing tailings provided by the present invention;

[0021] Figure 2 XRD diagram of sulfur-containing tailings used in the embodiments of the present invention;

[0022] Figure 3 The diagram is a graph showing the stabilization results of Pd by the methods of Examples 1 to 2 of the present invention and untreated sulfur-containing tailings;

[0023] Figure 4 This is a graph showing the stabilization results of Cd by the methods of Examples 1 to 2 of the present invention and untreated sulfur-containing tailings. DETAILED DESCRIPTION

[0024] The present invention provides a method for stabilizing heavy metals in sulfur-containing tailings, comprising the following steps:

[0025] (1) mixing the sulfur-containing tailings with a stabilizer to obtain a mixed material; 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) The mixed material obtained in step (1) is washed with an ethanol solution and then cured to obtain a stable sulfur-containing tailings.

[0027] The invention mixes the sulfur-containing tailings with a stabilizer to obtain a mixed material.

[0028] The present invention does not specifically limit the source of the sulfur-containing tailings, and the method of the present invention can be widely applied to sulfur-containing tailings that can be obtained by those skilled in the art. In the present invention, the metal carrier sulfide mineral ore in the sulfur-containing tailings preferably includes one or more of galena, sphalerite, chalcopyrite, stibnite, cadmium sulfide ore and arsenopyrite, more preferably galena or sphalerite. The present invention uses one or more metal elements including lead, cadmium, arsenic and zinc in the above-mentioned sulfur-containing tailings. In an embodiment of the present invention, the sulfur-containing tailings can be a tailings sample from the lead-zinc metal mining area in Guangxi.

[0029] The present invention preferably air-dries the sulfur-containing tailings first. The present invention can eliminate the problem that the quality of the sulfur-containing tailings and the stabilizer cannot be accurately controlled due to different moisture contents of the sulfur-containing tailings by air-drying, and is more conducive to more uniform mixing of the components. In the present invention, the moisture content of the sulfur-containing tailings is preferably ≤20%.

[0030] In the present invention, the particle size of the sulfur-containing tailings is preferably 5 to 400 meshes, more preferably 100 to 300 meshes. The particle size of the sulfur-containing tailings is controlled within the above range, which is more conducive to the full and uniform mixing of the sulfur-containing tailings and the stabilizer.

[0031] In the present invention, 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 stabilizer used in the present invention is cheap and easy to obtain, and has a low OCP value, which can expand the selection range of sulfur-containing tailings.

[0032] In the present invention, before the sulfur-containing tailings are mixed with the stabilizer, it is preferred to pre-treat the stabilizer, and the pre-treatment method preferably includes crushing and screening performed in sequence. The operation method of the grinding, crushing and screening in the present invention is not particularly limited, and conventional crushing and screening methods can be used. In an embodiment of the present invention, the crushing method is preferably grinding. The present invention can destroy the oxide film or passivation film on the surface of the stabilizer through grinding, crushing and screening, so that the conductive stabilizer surface is fully exposed.

[0033] In the present invention, the particle size of the stabilizer is preferably 50-200 meshes, more preferably 100 meshes. The present invention controls the particle size of the stabilizer within the above range, which is more conducive to being fully and evenly mixed with the sulfur-containing tailings.

[0034] In the present invention, the mass percentage of the stabilizer in the sulfur-containing tailings is preferably 1-7%, more preferably 3-5%. The present invention controls the amount of the stabilizer within the above range, which can have a good stabilizing effect on the sulfur-containing tailings and can ensure that heavy metal ions are not released after long-term accumulation.

[0035] In the present invention, 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 invention, the sulfur-containing tailings are the product of smelting metal carrier sulfide minerals, and the metal content therein is relatively low. The present invention measures the OCP value of the metal carrier sulfide mineral in the sulfur-containing tailings to obtain the OCP value of the sulfur-containing tailings. The present invention controls the OCP value of the stabilizer to be lower than the OCP value of the metal carrier sulfide mineral in the sulfur-containing tailings, and can screen a suitable stabilizer according to the different sulfur-containing tailings, and then use the galvanic cell effect to achieve the stabilization of heavy metals in the sulfur-containing tailings.

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

[0037] The present invention does not specifically limit the specific amount of the metal carrier sulfide mineral adhering to the working electrode of the stabilizer or sulfur-containing tailings, as long as the contact area between the metal carrier sulfide mineral adhering to the stabilizer or sulfur-containing tailings and the electrolyte is the same. In an embodiment of the present invention, the method of adhering the stabilizer or the metal carrier sulfide mineral of the sulfur-containing tailings to the working electrode can be: evenly spread the stabilizer or the metal carrier sulfide mineral of the sulfur-containing tailings on a 2cm×3cm conductive carbon paper, use a Nafion membrane solution to adhere the sample to the conductive carbon paper, and make a working electrode after drying.

[0038] In the present invention, the electrolyte of the electrochemical workstation is preferably a potassium nitrate solution, and the concentration of the potassium nitrate solution is preferably 1 to 100 mmol / L, more preferably 5 to 50 mmol / L, and further preferably 6 to 10 mmol / L; the pH value of the potassium nitrate solution is preferably 2 to 7, and more preferably 3 to 5. The present invention uses a potassium nitrate solution with the above concentration and pH value as the electrolyte, and its ionic strength is close to that of the metal carrier sulfide mineral leaching solution of the sulfur-containing tailings. Therefore, when the above parameter range is within, it is more conducive to accurately determine the OCP value of the stabilizer or the OCP value of the metal carrier sulfide mineral in the sulfur-containing tailings.

[0039] In the present invention, the method for preparing the sulfur-containing tailings leachate preferably comprises: soaking the metal carrier sulfide mineral of the sulfur-containing tailings in water to obtain the metal carrier sulfide mineral leachate of the sulfur-containing tailings. The present invention has no special restrictions on the amount of the metal carrier sulfide mineral of the sulfur-containing tailings and water, which can be adjusted as needed.

[0040] The present invention does not specifically limit the operating method of the OCP determination mode of the electrochemical workstation for testing, and the conventional operating method can be used. In an embodiment of the present invention, the operating method of the OCP determination mode of the electrochemical workstation for testing can be: using a traditional three-electrode electrolytic cell, using a working electrode of a metal carrier sulfide mineral of an adhesion stabilizer or sulfur-containing tailings, a platinum electrode and a saturated calomel electrode as the working electrode, auxiliary electrode and reference electrode respectively; the electrochemical test test conditions are 25±2°C, and a glass reactor with a capacity of 100mL is used as the electrolytic cell for the electrochemical reaction test; the working electrode is placed in 50mL of electrolyte solution, and the open circuit potential (OCP) of the sample is measured using an electrochemical workstation under the condition that the sampling interval is 0.1s.

[0041] The present invention has no special limitation on the method of mixing the sulfur-containing tailings and the stabilizer, as long as the two can be mixed evenly. In the present invention, the method of mixing the sulfur-containing tailings and the stabilizer is preferably stirring, and the stirring speed is preferably 20 to 100 r / min, more preferably 30 to 60 r / min; the stirring time is preferably 1 to 4 hours, more preferably 2 to 4 hours. The present invention can promote a more uniform mixing of the sulfur-containing tailings and the stabilizer by stirring.

[0042] After the mixed material is obtained, the present invention uses an ethanol solution to rinse the mixed material and then performs curing to obtain a stable sulfur-containing tailings.

[0043] In the present invention, the volume concentration of the ethanol solution is preferably 5-25%, more preferably 10-20%. The present invention uses the ethanol solution of the above concentration to quench the free radicals generated during the oxidation of sulfide minerals, and also has a lower use cost.

[0044] In the present invention, the number of elutions is preferably 1 to 3 times, more preferably 2 to 3 times. The present invention can quench the free radicals generated during the oxidation of sulfide minerals by eluting with ethanol solution, thereby reducing the oxidation and dissolution of heavy metals in sulfur-containing tailings and improving the stabilization effect on heavy metals. The present invention has no special limitation on the elution method, and a conventional elution method can be used.

[0045] In the present invention, the curing temperature is preferably 15-35°C, more preferably 25°C; the curing air humidity is preferably ≥30%, more preferably >95%. The present invention has no special limitation on the curing time, which can be adjusted according to the amount of the mixed material. In the present invention, the curing time is preferably ≥28 days. The present invention can fully quench the free radicals generated during the oxidation of sulfide minerals through curing.

[0046] The schematic flow diagram of the method provided by the present invention is preferably as follows Figure 1 As shown. Figure 1 It can be seen that the present invention first measures the tailings components (metal carrier sulfide minerals in sulfur-containing tailings) and the crushed and screened stabilizer to obtain the OCP of the stabilizer and the metal carrier sulfide minerals in the sulfur-containing tailings, and controls the OCP value of the stabilizer to be lower than the OCP of the metal carrier sulfide minerals in the sulfur-containing tailings, mixes the sulfur-containing tailings with the stabilizer, obtains a mixed material, and then uses an ethanol solution to wash and maintain it to obtain a stable sulfur-containing tailings, and then carries out storage and other disposal. The OCP value of the stabilizer used in the method provided by the present invention is lower than the OCP value of the metal carrier sulfide minerals in the sulfur-containing tailings, utilizes the galvanic cell effect, and realizes the stabilization of heavy metals in the sulfur-containing tailings by means of a sacrificial anode, and combines the quenching of free radicals by eluting with an ethanol solution, thereby significantly improving the stabilization effect of heavy metals in the sulfur-containing tailings.

[0047] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The sulfur-containing tailings and the metal carrier sulfide minerals of the sulfur-containing tailings used in the embodiment of the present invention are: the metal carrier sulfide mineral samples and the corresponding tailings are collected from the lead-zinc metal mining area in Guangxi, air-dried and sieved (100 meshes), and the metal carrier sulfide minerals and the sulfur-containing tailings are obtained. The XRD of the metal carrier sulfide minerals and the sulfur-containing tailings is as follows: Figure 2 As shown. Figure 2 It can be seen that the heavy metal carrier mineral types used in the present invention are mainly galena and sphalerite, etc., and the heavy metal pollutants in the sulfur-containing tailings are mainly lead and cadmium, etc.

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

[0050] Example 1

[0051] A method for stabilizing heavy metals in sulfur-containing tailings, comprising the following steps:

[0052] (1) galena tailings (100 mesh) and zero-valent iron (100 mesh) are stirred in a mixer at a speed of 30 r / min for 4 h according to a stabilizer mass percentage of 5% to the sulfur-containing tailings to obtain a mixed material;

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

[0054] (2) The mixed material obtained in step (1) is rinsed three times with a 20% ethanol solution, and then placed in a constant temperature and humidity chamber (25° C., humidity>95%) for curing for 28 days to obtain a stable 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) are stirred in a mixer at a speed of 30 r / min for 4 hours according to a stabilizer mass percentage of 5% to the sulfur-containing tailings to obtain a mixed material;

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

[0059] (2) The mixed material obtained in step (1) is rinsed three times with a 20% ethanol solution, and then placed in a constant temperature and humidity chamber (25° C., humidity>95%) for curing for 28 days to obtain a stable sulfur-containing tailings.

[0060] Example 3

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

[0062] (1) Sphalerite tailings (100 mesh) and zero-valent iron (100 mesh) are stirred in a mixer at a speed of 30 r / min for 4 h according to a stabilizer mass percentage of 5% to the sulfur-containing tailings to obtain a mixed material;

[0063] The OCP value of zero-valent iron and the OCP value of sphalerite were obtained according to the method of Example 1, and the results are shown in Table 1. As can be seen from Table 1, the OCP value of the zero-valent iron is lower than the OCP value of the sphalerite.

[0064] (2) The mixed material obtained in step (1) is rinsed three times with a 20% ethanol solution, and then placed in a constant temperature and humidity chamber (25° C., humidity>95%) for curing for 28 days to obtain a stable sulfur-containing tailings.

[0065] Example 4

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

[0067] (1) sphalerite tailings (100 mesh) and manganese sulfide (100 mesh) are stirred in a mixer at a speed of 30 r / min for 4 hours according to a stabilizer mass percentage of 5% to the sulfur-containing tailings to obtain a mixed material;

[0068] The OCP value of manganese sulfide and the OCP value of sphalerite were obtained according to the method of Example 1, and the results are shown in Table 1. As can be seen from Table 1, the OCP value of manganese sulfide is lower than the OCP value of sphalerite.

[0069] (2) The mixed material obtained in step (1) is rinsed three times with a 20% ethanol solution, and then placed in a constant temperature and humidity chamber (25° C., humidity>95%) for curing for 28 days to obtain a stable sulfur-containing tailings.

[0070] Test Case

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

[0072] Table 1 Open circuit potential of sulfur tailings and stabilizers in Examples 1 to 4

[0073] Material Open circuit potential (mV) Zero valent iron -279 Manganese sulfide -148 Galena 122 Sphalerite 126

[0074] The heavy metal concentrations were measured during the curing process of the stabilized sulfur-containing tailings treated with the stabilizer (control group) by the method of Examples 1 to 2 according to the "Solid Waste Leaching Toxicity Leaching Method Acetic Acid Buffer Solution Method" (HJ / T 300-2007). Samples were taken at 0 days, 7 days, 14 days, 21 days and 28 days, and the stabilization results for Pd were obtained as follows: Figure 3 As shown, the stability results for Cd are as follows Figure 4 As shown. Figure 3 and Figure 4 It can be seen that compared with untreated tailings, the stabilization rates of stabilizer 1 (zero-valent iron) and stabilizer 2 (manganese sulfide) for lead reached 97.9% and 79.1% respectively, and the stabilization rates of stabilizer 1 and stabilizer 2 for cadmium reached 22.4% and 14.7% respectively.

[0075] It can be seen from the above results that the method provided by the present invention has an excellent stabilizing effect on lead and cadmium. This is because the OCP value of the stabilizer used in the method provided by the present invention is lower than the OCP value of the sulfur-containing tailings, and the stabilization of heavy metals in the sulfur-containing tailings is achieved by using the galvanic cell effect and sacrificial anodes, and combined with the quenching of free radicals by eluting with an ethanol solution, the stabilizing effect of heavy metals in the sulfur-containing tailings can be significantly improved.

[0076] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

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 mixed material; the OCP value of the stabilizer is lower than the OCP value of the metal carrier sulfide mineral of the sulfur-containing tailings; (2) The mixed material obtained in step (1) is washed with an ethanol solution and then cured to obtain a stable sulfur-containing tailings.

2. The method according to claim 1, characterized in that The metal carrier sulfide minerals in the sulfur-containing tailings in step (1) include one or more of galena, sphalerite, chalcopyrite, stibnite, cadmium sulfide and arsenopyrite.

3. The method according to claim 1 or 2, characterized in that: The particle size of the sulfur-containing tailings is 5 to 400 meshes.

4. The method according to claim 1, characterized in that: The stabilizer in step (1) includes one or more of zero-valent iron, manganese sulfide, magnesium alloy powder and aluminum alloy powder.

5. The method according to claim 1 or 4, characterized in that: Before the sulfur-containing tailings are mixed with the stabilizer, the stabilizer is pretreated, and the pretreatment method includes crushing and screening in sequence.

6. The method according to claim 1, characterized in that In the step (1), the mass percentage of the stabilizer in the sulfur-containing tailings is 1-7%.

7. The method according to claim 1, characterized in that In the step (1), the OCP value of the stabilizer or the OCP value of the sulfur-containing tailings is tested using the OCP determination 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.

8. The method according to claim 7, characterized in that The electrolyte of the electrochemical workstation is potassium nitrate solution or sulfur-containing tailings leaching solution.

9. The method according to claim 8, characterized in that The concentration of the potassium nitrate solution is 1-100 mmol / L; the pH value of the potassium nitrate solution is 2-7.

10. The method according to claim 1, characterized in that The curing temperature in step (2) is 15-35° C.; the curing air humidity is ≥30%.

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