A method for improving molybdenum tailings for use as a planting soil

Abstract

This invention provides an improved method for preparing planting soil from molybdenum tailings, relating to the field of bulk solid waste resource utilization. The method employs a simultaneous oxygen-sulfur flotation process, using roughing, cleaning, and scavenging to remove heavy metals from the molybdenum tailings. The flotation-processed molybdenum tailings slurry is then subjected to flocculation, sedimentation, and dewatering to obtain a paste-like tailings. A water-retaining agent, pH adjuster, natural minerals, and organic matter are mechanically mixed with the paste-like tailings, and the resulting mixture is then stockpiled and aged to obtain plantable soil. This invention eliminates the risk of heavy metal toxicity from molybdenum tailings through flotation and improves the basic properties, biochemical reaction conditions, and water and fertilizer retention capacity of the molybdenum tailings using functional additives. Based on the characteristics and application needs of molybdenum tailings, this invention transforms molybdenum tailings into soil of different qualities using a low-cost and simple process, expanding the application range of molybdenum tailings soil and facilitating the bulk disposal and resource utilization of molybdenum tailings.

Description

Technical Field

[0001] This invention relates to the field of bulk solid waste resource utilization, and in particular to a method for improving planting soil from molybdenum tailings. Background Technology

[0002] With the rapid development of my country's economy, the demand for mineral resources is constantly increasing, and the amount of tailings generated after mineral processing is also growing rapidly. Adopting the advanced concept of "from the ground to the soil," transforming tailings into soil suitable for plant growth provides functional soil for agriculture, forestry, and greening industries in the local area and surrounding regions. This is an effective means to achieve on-site and full utilization of tailings and ecological restoration of mining areas.

[0003] Patent CN202010417097.1 discloses a method for transforming heavy metal tailings slag into soil suitable for plant growth. The process includes: first, rotary tilling different additives into the tailings; then, planting plants on the surface; and finally, spraying fertilizer onto the surface. CN104529668A discloses a soil conditioner for metal mines and a method for ecological restoration of mines using the conditioner. The conditioner includes animal manure, mushroom residue, crop straw, distiller's grains, and traditional Chinese medicine residue. The conditioner is mixed evenly with the topsoil, and after equilibration for 1-3 months, plants are planted. CN104987260A discloses an ecological restoration substrate for lead-zinc tailings ponds. This substrate mainly involves mixing tailings, organic matter, and a tailings conditioner to achieve improvement. The tailings conditioner includes water-retaining agents, binders, and chelating agents, enabling rapid ecological restoration of lead-zinc tailings ponds. CN105061001A discloses an acidic copper tailings matrix improver, the improved matrix, its preparation method, and its application. The improvers used include bentonite, rice husks, sludge, coal slag, and animal manure. They primarily target the acidity / alkalinity, nutrient availability, organic matter supply, and texture of the tailings, effectively restoring vegetation growth in acidic copper mines. CN10972251A discloses a method for constructing erosion-resistant fertile soil from ion-type rare earth leaching tailings. This involves mixing clay, biomass, humic acid, and polyacrylamide with the tailings, spraying with calcium oxide and potassium sulfate solutions, and then planting plants. However, these technologies mainly focus on improving tailings properties, supplementing nutrients, and solidifying heavy metals to prepare soil suitable for plant growth. The amount of chemicals used is large, resulting in high costs. Furthermore, heavy metals remain in the soil, posing a risk of secondary pollution, and the application scope of the remediated tailings is relatively limited, failing to fully realize the resource utilization of tailings.

[0004] Molybdenum is an important non-ferrous metal, but the grade of molybdenum in molybdenum ore is low, resulting in a large amount of molybdenum tailings after beneficiation. The main components of molybdenum tailings are Ca, Si, Fe, Al, and K, with small amounts of Mo, Cu, Pb, Zn, and W. Currently, the vast majority of molybdenum tailings are stockpiled, leading to resource waste, land occupation, and environmental damage. Domestic efforts have been made to comprehensively utilize molybdenum tailings in building materials and other fields, which has been beneficial to the disposal of molybdenum tailings to some extent. However, due to resource characteristics, geographical location, economic environment, and product technical and economic indicators, it is difficult to stably achieve large-scale disposal of molybdenum tailings.

[0005] Molybdenum tailings generally contain various trace elements essential for plant growth, such as Mo, Cu, Zn, Mn, and Fe, which can promote plant growth. At the same time, many molybdenum tailings contain very low levels of harmful heavy metals such as Pb, As, Hg, Cr, and Cd, which will not have adverse effects on plants or the environment. Therefore, soil treatment of molybdenum tailings with low levels of harmful heavy metals is beneficial for the large-scale disposal of molybdenum tailings, improving the thickness and quality of the soil cover layer around the mining area, and eliminating safety hazards of tailings ponds.

[0006] To convert molybdenum tailings into suitable soil, two key aspects need to be addressed: first, the heavy metal content in the tailings must be further reduced; second, the tailings must be improved to enhance their relevant performance indicators and meet the needs of plant growth. Based on this, the present invention provides a method for improving molybdenum tailings to prepare planting soil. Summary of the Invention

[0007] This invention provides an improved method for preparing planting soil from molybdenum tailings, the purpose of which is to solve the aforementioned problems existing in the background art.

[0008] To achieve the above objectives, embodiments of the present invention provide a method for preparing planting soil from molybdenum tailings. This method employs a simultaneous oxygen-sulfur flotation process, involving roughing, cleaning, and scavenging to remove heavy metals from the molybdenum tailings. The resulting molybdenum tailings slurry is then subjected to flocculation, sedimentation, and dewatering to obtain a paste-like tailings. A water-retaining agent, pH adjuster, natural minerals, and organic matter are mechanically mixed with the paste-like tailings. The resulting mixture is then piled up for aging to produce the final soil product. This invention eliminates the risk of heavy metal toxicity from molybdenum tailings through flotation and improves the basic properties, biochemical reaction conditions, water retention, and fertilizer retention performance of molybdenum tailings using functional additives. This low-cost, simple process transforms molybdenum tailings into soils of varying qualities, expanding the application range of molybdenum tailings soils and facilitating the large-scale disposal and resource utilization of molybdenum tailings.

[0009] An embodiment of the present invention provides a method for improving planting soil from molybdenum tailings, comprising the following steps:

[0010] S1: The molybdenum tailings are regrinded and then subjected to simultaneous oxygen-sulfur flotation, followed by roughing, cleaning, and scavenging to obtain heavy metal enriched material and a molybdenum tailings slurry with low heavy metal content. Simultaneous oxygen-sulfur flotation technology can simultaneously enrich metal oxides and sulfides in the molybdenum tailings, achieving significant removal of heavy metals and obtaining a molybdenum tailings slurry with low heavy metal content.

[0011] S2: Add flocculant and coagulant to the molybdenum tailings slurry, and after flocculation, sedimentation and dewatering, obtain paste-like tailings;

[0012] S3: Add pH adjuster, water-retaining agent, and soil conditioner to the paste-like tailings, stir and mix evenly, then pile and age to obtain planting soil. The water-retaining agent enhances the water storage and retention capacity of the molybdenum tailings soil; the pH adjuster regulates the acidity and alkalinity of the molybdenum tailings soil to a suitable level; and the natural minerals and organic matter improve cation exchange capacity, enhance water retention, improve soil structure, increase soil nutrients, promote soil aggregate formation, improve the soil microbial living environment, and promote the restoration of the self-purification capacity of the molybdenum tailings soil.

[0013] Preferably, in step S1, the collector used in the roughing process is one or more of sodium fatty acid, octadecylamine, dodecylamine, and sodium xanthate, with a dosage of 50-1500 g / t; the inhibitor used is one or more of water glass, sodium hexametaphosphate, magnesium chloride, sodium lignosulfonate, and sodium humate, with a dosage of 100-4000 g / t.

[0014] Preferably, in step S1, the inhibitor used in the selection process is one or more of water glass, sodium hexametaphosphate, magnesium chloride, sodium lignosulfonate, and sodium humate, and the dosage is 0-400 g / t.

[0015] Preferably, in step S1, the collector used in the scavenging process is one or more of sodium fatty acid, octadecylamine, dodecylamine, and sodium xanthate, and the dosage is 10-300 g / t.

[0016] Preferably, in step S2, the flocculant is polyacrylamide, and the dosage is 10-50 g / t; the coagulant is at least one of polyaluminum, alum, polyaluminum sulfate, and polyferric sulfate, and the dosage is 20-80 g / t.

[0017] Preferably, in step S2, the moisture content of the paste-like tailings is 15-30%.

[0018] Preferably, in step S3, the pH adjuster is at least one of citric acid, acetic acid, and ammonium dihydrogen phosphate, and the addition amount is 10-500 g / t; the water-retaining agent is at least one of polyacrylamide, sodium polyacrylate, potassium polyacrylate, ammonium polyacrylate, and sodium carboxymethyl cellulose, and the addition amount is 10-50 g / t.

[0019] Preferably, in step S3, the pH value of the paste-like tailings is adjusted to 5.2 to 8.0 using a pH adjuster.

[0020] Preferably, in step S3, the modifier is a natural mineral and an organic matter; the natural mineral is at least one of vermiculite, diatomaceous earth, montmorillonite, kaolinite, zeolite, and talc, and the amount added is 0.1-2.0%; the organic matter is at least one of farmyard manure, livestock manure, humus, plant processing residue, and crushed plant shells, leaves, stems, and roots, and the amount added is 0.1-2.0%.

[0021] Preferably, in step S3, the conditions for the aging process are: aging at room temperature for 5 to 20 days.

[0022] The above-described solution of the present invention has the following beneficial effects:

[0023] (1) In this invention, most of the heavy metals in molybdenum tailings are removed by re-flotation. Then, after flocculation, sedimentation, and dewatering, re-selected molybdenum tailings are obtained. The re-selected molybdenum tailings are mechanically mixed with water-retaining agents, natural minerals, organic matter, and pH adjusters, and finally piled up for aging to obtain functionalized soil. By removing most of the heavy metals in the molybdenum tailings through re-selection, the toxic effects of heavy metals in the molybdenum tailings are eliminated. Then, functional substances are introduced by stirring to improve the properties of the molybdenum tailings.

[0024] (2) The flocculants, coagulants, water-retaining agents, and pH adjusters used in this invention are added in small amounts, resulting in low reagent costs. Natural minerals and organic matter are inexpensive and readily available, and can be sourced locally, effectively reducing treatment costs. In addition, the functional additives used are comprehensive, fast, and efficient, and specifically improve the water and fertilizer retention, basic physicochemical properties, and nutrient transport properties of molybdenum tailings. This provides favorable biochemical reaction conditions and nutrients for the survival of microorganisms and plant growth in the soil products of molybdenum tailings, thus better promoting the natural improvement of soil properties and crop growth in molybdenum tailings.

[0025] (3) This invention establishes a corresponding re-selection process and reagent system for the types and contents of heavy metals in molybdenum tailings and the uses of molybdenum tailings soil products. It can reasonably and efficiently remove heavy metals from molybdenum tailings. The process is simple and easy to implement, with low production cost and high processing efficiency, which is conducive to the rapid disposal of large quantities of tailings.

[0026] (4) This invention has wide applicability. By adjusting the mineral processing parameters, the heavy metal content in molybdenum tailings can be effectively controlled. By adjusting the amount of functional substances added, the basic properties, nutrient composition, and biochemical reactivity of molybdenum tailings soil products can be controlled. Molybdenum tailings soils with different heavy metal contents and different property indicators have different production costs, sales prices, and application scenarios. Therefore, by simply adjusting the preparation process parameters, soils of different qualities can be prepared according to application needs, such as agricultural soil, forestry soil, greening soil, and nutrient soil, thus expanding the application scope of molybdenum tailings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a comparison of the rate of water evaporation and descent of molybdenum tailings before and after improvement with that of farmland soil in Example 1 of the present invention;

[0029] Figure 2 Example 2 of the present invention compares the rate of water evaporation and decline in vegetable field soil before and after the improvement of molybdenum tailings;

[0030] Figure 3 Example 3 of this invention compares the rate of water evaporation and decline in forest soil before and after the improvement of molybdenum tailings. Detailed Implementation

[0031] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0032] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0033] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0034] The "%" mentioned in this article refers to percentages based on mass.

[0035] This invention addresses existing problems by providing a method for preparing planting soil from molybdenum tailings. The method employs a simultaneous oxygen-sulfur flotation process, involving roughing, cleaning, and scavenging to remove heavy metals from the molybdenum tailings. The resulting molybdenum tailings slurry is then subjected to flocculation, sedimentation, and dewatering to obtain a paste-like tailings. A water-retaining agent, pH adjuster, natural minerals, and organic matter are mechanically mixed with the paste-like tailings. The resulting mixture is then piled up for aging to produce the final soil product. This invention eliminates the risk of heavy metal toxicity from molybdenum tailings through flotation and improves the basic properties, biochemical reaction conditions, water retention, and fertilizer retention capacity of the molybdenum tailings using functional additives. This low-cost, simple process transforms molybdenum tailings into soils of varying qualities, expanding the application range of molybdenum tailings soils and facilitating the large-scale disposal and resource utilization of molybdenum tailings. This invention is characterized by its simple technology, strong feasibility, and low cost. It helps to realize the large-scale, high-value, and stable utilization of molybdenum tailings. By enriching the residual heavy metals in molybdenum tailings, it obtains molybdenum tailings with low heavy metal content, providing a large amount of functional soil for crop planting, realizing the on-site disposal of molybdenum tailings and ecological restoration of mining areas. It has important practical significance and huge economic benefits for the development of local mining, agriculture, forestry, greening and other industries.

[0036] The following embodiments of the present invention use three types of molybdenum tailings. All three types of molybdenum tailings contain four heavy metals: manganese (Mn), copper (Cu), lead (Pb), and zinc (Zn). Their contents are shown in Table 1. Table 2 shows the risk screening values ​​for agricultural land soil pollution as specified in GB 15618-2018.

[0037] Table 1 Heavy metal content of three types of molybdenum tailings

[0038] Molybdenum tailings 1 0.22 0.015 0.012 0.048 Molybdenum tailings 2 0.03 0.04 0.004 0.07 Molybdenum tailings 3 0.24 0.05 0.014 0.09

[0039] Table 2 Screening values ​​for soil pollution risks in agricultural land (GB 15618-2018)

[0040]

[0041] Example 1

[0042] In this embodiment, polyacrylamide is used as a flocculant and water-retaining agent, alum as a coagulant, citric acid as a pH adjuster, and montmorillonite and farmyard manure as amendments to mechanically mix the low-heavy-metal content molybdenum tailings 1 after flotation removal. Specific implementation parameters are as follows:

[0043] Step 1: The flotation process consists of roughing, cleaning, and scavenging. Sodium oleate is used as the collector (500 g / t) and water glass as the depressant (500 g / t) in the roughing process. Magnesium chloride is used as the depressant (100 g / t) in the cleaning process. Sodium oleate is used as the collector (50 g / t) in the scavenging process.

[0044] Step 2: The flocculant and coagulant are polyacrylamide and alum, with usage amounts of 30g / t and 20g / t, respectively.

[0045] Step 3: pH adjuster, water-retaining agent, natural minerals, and organic matter are 20g / t of citric acid, 20g / t of polyacrylamide, 1.0% of montmorillonite (10kg / t based on the mass of tailings), and 1.5% of farmyard manure (15kg / t based on the mass of tailings), respectively.

[0046] Heavy metals were removed from the molybdenum tailings by flotation, and the results are shown in Table 3. The removal rates of Mn, Cu, Pb, and Zn were 61.36%, 42.00%, 39.17%, and 41.67%, respectively. After natural aging for 7 days, the molybdenum tailings were converted into soil, and its properties were analyzed. The results are shown in Table 4.

[0047] Table 3 Heavy metal content of molybdenum tailings 1 after flotation and re-selection

[0048] Select molybdenum tailings 1 850 87 73 280

[0049] Table 4 Physicochemical parameters of molybdenum tailings soil 1 after soilification treatment

[0050]

[0051] As shown in Table 4, after the implementation of this invention, the saturated water content of molybdenum tailings soil 1 increased from 30.16% to 46.21%, the pH value decreased from 8.58 to 7.54, the CEC (cation exchange capacity) increased from 7.77 cmol(+) / kg to 12.13 cmol(+) / kg, the water-soluble salt content decreased from 2.42 g / kg to 1.03 g / kg, and the EC (electrical conductivity) decreased from 3.2 mS / cm to 1.26 mS / cm. The heavy metal (Cu, Pb, Zn) content in molybdenum tailings soil 1 all met the limits specified in GB / 15618-2018 standard.

[0052] from Figure 1 It can be seen that the water evaporation rate and water decline rate of the improved molybdenum tailings 1 (i.e., molybdenum tailings soil 1) have been significantly improved, which is better than that of normal farmland soil.

[0053] Example 2

[0054] In this embodiment, polyacrylamide is used as a flocculant, polyaluminum sulfate as a coagulant, potassium polyacrylate as a water-retaining agent, acetic acid as a pH adjuster, and vermiculite and livestock manure as modifiers to mechanically mix the low-heavy-metal content molybdenum tailings 2 after flotation removal. Specific implementation parameters are as follows:

[0055] Step 1: The flotation process consists of roughing, cleaning, and scavenging. Sodium pentyl xanthate is used as the collector (200 g / t) and water glass as the depressant (100 g / t) for roughing. Sodium lignosulfonate is used as the depressant (200 g / t) for cleaning. Sodium pentyl xanthate is used as the collector (10 g / t) for scavenging.

[0056] Step 2: The flocculant and coagulant are polyacrylamide and polyaluminum sulfate, with usage amounts of 10 g / t and 40 g / t, respectively.

[0057] Step 3: pH adjuster, water retainer, natural minerals, and organic matter are citric acid 30g / t, potassium acrylate 30g / t, vermiculite 0.5% (based on tailings mass, 5kg / t) and livestock manure 1.0% (based on tailings mass, 10kg / t).

[0058] First, the molybdenum tailings were subjected to flotation to remove heavy metals. The results are shown in Table 5. The removal rates of Mn, Cu, Pb, Mo and Zn were 38.33%, 60.50%, 30.00% and 65.29%, respectively. After natural aging for 14 days, the molybdenum tailings were converted into soil products, and their properties were analyzed. The results are shown in Table 6.

[0059] Table 5 Heavy metal content of molybdenum tailings 2 after flotation and re-selection

[0060] Select molybdenum tailings 2 185 158 28 243

[0061] Table 6 Physicochemical parameters of molybdenum tailings soil 2 after soilification treatment

[0062]

[0063] As shown in Table 6, after the implementation of this invention, the saturated water content of molybdenum tailings soil 2 increased from 31.23% to 80.40%, the pH value decreased from 8.94 to 6.87, the CEC (cation exchange capacity) increased from 5.56 cmol(+) / kg to 9.93 cmol(+) / kg, the water-soluble salt content decreased from 4.30 g / kg to 2.43 g / kg, and the EC (electrical conductivity) decreased from 3.30 mS / cm to 2.12 mS / cm. The heavy metal (Cu, Pb, Zn) content in molybdenum tailings soil 2 all met the limits specified in GB / 15618-2018 standard.

[0064] from Figure 2 As can be seen, the water evaporation rate and water loss rate of the improved molybdenum tailings 2 (i.e., molybdenum tailings soil 2) have been significantly improved, and are similar to those of vegetable field soil.

[0065] Example 3

[0066] In this embodiment, polyacrylamide is used as a flocculant and water-retaining agent, polyferric sulfate is used as a flocculant, citric acid is used as a pH adjuster, and kaolin and humic substances are used as modifiers to mechanically mix the low-heavy-metal content molybdenum tailings 3 after flotation removal. Specific implementation parameters are as follows:

[0067] Step 1: The flotation process consists of roughing, cleaning, and scavenging. Sodium oleate is used as the collector (1000 g / t) and sodium hexametaphosphate as the depressant (100 g / t) in the roughing process. Sodium hexametaphosphate is used as the depressant (50 g / t) in the cleaning process. Sodium oleate is used as the collector (100 g / t) in the scavenging process.

[0068] Step 2: The flocculant and coagulant are polyacrylamide and polyferric sulfate, respectively, with usage amounts of 20 g / t and 30 g / t.

[0069] Step 3: pH adjuster, water-retaining agent, natural minerals, and organic matter are 20g / t of citric acid, 50g / t of polyacrylamide, 0.1% of kaolin (1kg / t based on tailings mass), and 0.2% of humus (2kg / t based on tailings mass), respectively.

[0070] First, the molybdenum tailings were subjected to flotation to remove heavy metals. The results are shown in Table 7. The removal rates of Mn, Cu, Pb and Zn were 65.2%, 63%, 32.14% and 53.14%, respectively. After natural aging for 18 days, the molybdenum tailings were converted into soil products, and their properties were analyzed. The results are shown in Table 8.

[0071] Table 7 Heavy metal content of molybdenum tailings 3 after flotation and re-selection

[0072] Select molybdenum tailings 3 835 185 95 273

[0073] Table 8 Physicochemical parameters of soil 3 from molybdenum tailings after soil treatment

[0074]

[0075] As shown in Table 8, after the implementation of this invention, the saturated water content of the molybdenum tailings increased from 28.9% to 117.3%, the pH value decreased from 9.04 to 7.76, the CEC (cation exchange capacity) increased from 8.87 cmol(+) / kg to 10.15 cmol(+) / kg, the water-soluble salt content decreased from 3.25 g / kg to 2.13 g / kg, and the EC (electrical conductivity) decreased from 2.87 mS / cm to 2.15 mS / cm. The heavy metal (Cu, Pb, Zn) content in the molybdenum tailings met the limits specified in GB / 15618-2018.

[0076] from Figure 3As can be seen, the water evaporation rate and water decline rate of the improved molybdenum tailings 3 (i.e., molybdenum tailings soil 3) were significantly improved, and were similar to those of normal forest soil.

[0077] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for improving planting soil from molybdenum tailings, characterized in that, Includes the following steps: S1: The molybdenum tailings are regrinded and then subjected to simultaneous oxygen-sulfur flotation. After roughing, cleaning and scavenging, heavy metal enrichment and molybdenum tailings slurry with low heavy metal content are obtained. Among them, the collector used in the roughing process is sodium fatty acid, and the dosage is 50-1500g / t. S2: Add flocculant and coagulant to the molybdenum tailings slurry, and after flocculation, sedimentation and dewatering, obtain paste-like tailings; S3: Add pH adjuster, water-retaining agent and improver to the paste tailings, stir and mix evenly, and then pile and age to obtain planting soil; In step S2, the flocculant is polyacrylamide, and the dosage is 10-50 g / t; the coagulant is at least one of polyaluminum, alum, polyaluminum sulfate, and polyferric sulfate, and the dosage is 20-80 g / t. In step S2, the moisture content of the paste-like tailings is between 15% and 30%. In step S3, the pH adjuster is citric acid, and the amount of citric acid added is 10-500 g / t; the water-retaining agent is polyacrylamide, and the amount of polyacrylamide added is 10-50 g / t. In step S3, the pH value of the paste-like tailings is adjusted to 5.2–8.0 using a pH adjuster; the improver is a natural mineral and organic matter; the amount of natural mineral added is 0.1–2.0%; the amount of organic matter added is 0.1–2.0%; the natural mineral is at least one of vermiculite, montmorillonite, kaolinite, and talc; the organic matter is at least one of farmyard manure, livestock manure, humus, plant processing residue, and crushed plant shells, leaves, stems, and roots. The molybdenum tailings contain four heavy metals: manganese (Mn), copper (Cu), lead (Pb), and zinc (Zn).

2. The method for improving planting soil from molybdenum tailings according to claim 1, characterized in that, In step S1, during the roughing process, the inhibitor used is one or more of water glass, sodium hexametaphosphate, magnesium chloride, sodium lignosulfonate, and sodium humate, with a dosage of 100–4000 g / t.

3. The method for improving planting soil from molybdenum tailings according to claim 1, characterized in that, In step S1, the inhibitors used in the selection process are one or more of water glass, sodium hexametaphosphate, magnesium chloride, sodium lignosulfonate, and sodium humate, with a dosage of 0–400 g / t.

4. The method for improving planting soil from molybdenum tailings according to claim 1, characterized in that, In step S1, the collector used in the scavenging process is one or more of sodium fatty acid, octadecylamine, dodecylamine, and sodium xanthate, and the dosage is 10-300 g / t.

5. The method for improving planting soil from molybdenum tailings according to claim 1, characterized in that, In step S3, the conditions for the aging process are: aging at room temperature for 5 to 20 days.

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