Method for recovering molybdenum-nickel ore waste residue vegetation

Abstract

The invention provides a molybdenum-nickel ore waste residue vegetation restoration method, and belongs to the technical field of mine ecological restoration. The bactericide is added to inhibit the activity of acidophilic oxidizing bacteria, the problem of acid production of the acidophilic oxidizing bacteria is solved from the source, and acidification of the molybdenum-nickel ore waste residues is effectively inhibited; acidic substances in the molybdenum-nickel ore waste residues are neutralized by using alkaline substances in the red mud, the acidity of the molybdenum-nickel ore waste residues is reduced, and the contents of organic matters and nutrients in the molybdenum-nickel ore waste residues are increased and the physical structure of the molybdenum-nickel ore waste residues is improved by using rich nutrient elements and a large number of beneficial microorganisms in the red mud, the sludge and the cow dung; the acidic environment of the molybdenum-nickel ore waste residues is effectively regulated and controlled, the habitat conditions of the molybdenum-nickel ore waste residues are improved, the molybdenum-nickel ore waste residues meet the basic plant growth conditions after being subjected to acidification inhibition, acidity regulation and control and habitat improvement, herbaceous plants are planted, and release of pollutants can be effectively relieved; the method not only effectively controls the influence of molybdenum-nickel ore waste residue pollutant release on the surrounding ecological environment from the source, but also has remarkable social, economic and landscape benefits.

Description

Technical Field

[0001] The invention relates to the technical field of mine ecological restoration, and in particular to a method for restoring vegetation on molybdenum-nickel mine waste residue. Background Art

[0002] Molybdenum-nickel ore is a kind of multi-metallic complex mineral resource unique to my country. It is mainly a sedimentary black shale deposit with complex composition, containing a variety of metals and non-metallic elements such as Mo, Ni, V, Cu, Pt, Mn, Se, etc. It is mainly distributed in Zunyi, Guizhou, Northwest Hunan, Duchang, Hubei, Yunnan and Fuyang, Zhejiang. The mining method of molybdenum-nickel ore is mainly underground mining. Due to the thin ore layer and large mining ratio, there are a lot of molybdenum-nickel ore waste slag during the mining process. A large amount of waste slag is piled up in the open air on slopes or gullies. Under the influence of wind and rain, the waste slag containing pyrite is very easy to undergo oxidative exothermic reaction under the influence of rainwater leaching and bacterial catalysis, producing a large amount of heavy metals such as Ni, Mo, V, Cu, Pt, Au, Se and high-concentration sulfate. These pollutants will enter the environment to pollute the surrounding water and soil, and eventually endanger human health through the food chain.

[0003] The sulfur oxides contained in the molybdenum-nickel ore waste will produce a large amount of acidic wastewater containing heavy metals and sulfates under the catalytic action of acidophilic ferrothiobacillus, thiothiobacillus thiooxidans, etc., which are hazardous substances with leaching characteristics and have strong biological toxicity. At present, there are two main methods to control the dissolution of heavy metals in tailings waste. One is to inhibit the release of harmful elements in tailings by solidification, so that they cannot enter the surrounding environment; the other is to maximize the leaching of heavy metal elements from tailings waste, which can not only reduce the metal toxicity in tailings, but also recycle and utilize valuable metal elements. However, solidification only temporarily inhibits the release of harmful elements and does not fundamentally eliminate the threat to the environment; the traditional leaching method mainly relies on acid leaching or alkaline leaching with chemical agents such as sulfuric acid and ammonia water, which is likely to cause secondary pollution. Although the ecological disposal of molybdenum-nickel ore waste in the prior art is one of the effective means to protect the surrounding environment, it can not only inhibit the outflow of heavy metals but also have a landscape effect, but the plant root system will also promote the dissolution of heavy metals in the restoration area and migrate and transform into plant water bodies, and cannot effectively inhibit the dissolution of heavy metals and sulfates. How to effectively carry out ecological restoration and inhibit the dissolution of heavy metals and sulfates is currently a major challenge in the ecological restoration of molybdenum-nickel mine waste. Summary of the invention

[0004] The purpose of the present invention is to provide a method for restoring vegetation of molybdenum-nickel mine waste residue. The method provided by the present invention can effectively solve the problem of easy release of heavy metals and sulfates in molybdenum-nickel mine waste residue, achieve the reduction of the effectiveness of heavy metals in the waste residue, control the release of heavy metals, and achieve vegetation coverage standards.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for restoring vegetation of molybdenum-nickel ore waste residue, comprising the following steps:

[0007] (S1) mixing the to-be-treated molybdenum-nickel ore waste residue with a bactericide for stabilization, and then mixing and aging with red mud, sewage sludge and cow dung to obtain an improved mixture;

[0008] The volume ratio of the bactericide to the mass of the molybdenum-nickel ore waste is (20-60) mL: 100 g, the amount of red mud added is 3wt%-10wt% of the molybdenum-nickel ore waste, the amount of sludge added is 3wt%-10wt% of the molybdenum-nickel ore waste, and the amount of cow dung added is 3wt%-10wt% of the molybdenum-nickel ore waste;

[0009] (S2) sowing herbaceous plant seeds on the molybdenum-nickel mine waste slag dump, then covering it with the improved mixture obtained in the step (S1), and performing regular maintenance to achieve molybdenum-nickel mine waste slag improvement and vegetation restoration.

[0010] Preferably, before mixing in step (S1), the molybdenum-nickel ore waste residue, red mud, sludge and cow dung to be treated are naturally air-dried, crushed and sieved in sequence.

[0011] Preferably, the bactericide in step (S1) is an aqueous solution of at least one of sodium dodecyl sulfate, kasone and triclosan.

[0012] Preferably, in step (S1), when the fungicide is an aqueous solution of sodium dodecyl sulfate, the concentration of sodium dodecyl sulfate in the fungicide is 15 to 30 mg / L.

[0013] Preferably, in the step (S1), when the fungicide is an aqueous solution of triclosan, the concentration of triclosan in the fungicide is 45 to 80 mg / L.

[0014] Preferably, in the step (S1), when the fungicide is an aqueous solution of kasperone, the concentration of kasperone in the fungicide is 25-40 mg / L.

[0015] Preferably, in the step (S1), the molybdenum-nickel ore waste residue to be treated is first mixed with a bactericide.

[0016] Preferably, the aging in step (S1) is performed by standing at room temperature for 1 to 3 days.

[0017] Preferably, in the step (S2), no additional soil covering is required after sowing the herbaceous plant seeds.

[0018] Preferably, the herbaceous plant seeds in step (S2) are ryegrass seeds, and the regular maintenance includes regular watering.

[0019] The present invention provides a method for restoring vegetation of molybdenum-nickel ore waste residue, which can effectively inhibit the acidification and acidity regulation of molybdenum-nickel ore waste residue, inhibit the release of heavy metals, and promote the improvement of molybdenum-nickel ore waste residue and the restoration of vegetation. The present invention suppresses the activity of acidophilic oxidizing bacteria such as acidobacillus ferrooxidans and acidobacillus thiooxidans by adding a bactericide, solves the acid production problem of acidophilic oxidizing bacteria from the source, effectively reduces the acidity of molybdenum-nickel ore waste residue, and realizes effective suppression of molybdenum-nickel ore waste residue acidification; the present invention utilizes alkaline substances in red mud to neutralize acidic substances in molybdenum-nickel ore waste residue, reduces the acidity of molybdenum-nickel ore waste residue, utilizes rich carbon, nitrogen, phosphorus, sulfur, potassium and other nutrient elements contained in red mud, urban residual activated sludge and cow dung, and a large number of beneficial microorganisms, so as to effectively increase the organic matter and nutrient content of molybdenum-nickel ore waste residue, improve the physical structure of the waste residue, realize effective regulation of the acidity of molybdenum-nickel ore waste residue and habitat improvement, and the molybdenum-nickel ore waste residue meets the basic conditions for plant growth after acidification suppression, acid regulation and habitat improvement, and plants herbaceous plants are planted in the molybdenum-nickel ore waste residue yard, which can effectively slow down the release of pollutants, not only effectively controls the impact of the release of pollutants from molybdenum-nickel ore waste residue on the surrounding ecological environment from the source, but also has significant social, economic and landscape benefits.

[0020] The materials used for acid regulation and habitat improvement of molybdenum-nickel ore waste residue in the present invention are mostly industrial and agricultural solid wastes, including bulk solid waste (red mud) and organic solid waste (urban residual activated sludge, cow dung). They are not only inexpensive, but also reduce the environmental risks of the storage of bulk solid wastes such as red mud, and better realize the resource utilization of solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The pH value of the molybdenum-nickel ore waste residue leachate collected in Comparative Examples 1 and 2 and Examples 1 to 3 of the present invention varies with time;

[0022] Figure 2 The redox potential (abbreviated as Eh) of the molybdenum-nickel ore waste residue leachate collected in Comparative Examples 1 and 2 and Examples 1 to 3 of the present invention varies with time;

[0023] Figure 3 The sulfate concentration in the leachate of molybdenum-nickel ore waste residue collected in Comparative Examples 1 and 2 and Examples 1 to 3 of the present invention varies with time;

[0024] Figure 4 This is a bar graph of the average plant height of ryegrass on the 30th day after sowing in Comparative Examples 1 and 2 and Examples 1 to 3 of the present invention. DETAILED DESCRIPTION

[0025] The present invention provides a method for restoring vegetation of molybdenum-nickel ore waste residue, comprising the following steps:

[0026] (S1) mixing the to-be-treated molybdenum-nickel ore waste residue with a bactericide for stabilization, and then mixing and aging with red mud, sewage sludge and cow dung to obtain an improved mixture;

[0027] The volume ratio of the bactericide to the mass of the molybdenum-nickel ore waste is (20-60) mL: 100 g, the amount of red mud added is 3wt%-10wt% of the molybdenum-nickel ore waste, the amount of sludge added is 3wt%-10wt% of the molybdenum-nickel ore waste, and the amount of cow dung added is 3wt%-10wt% of the molybdenum-nickel ore waste;

[0028] (S2) sowing herbaceous plant seeds on the molybdenum-nickel mine waste residue, then covering it with the improved mixture obtained in the step (S1), and performing regular maintenance to achieve habitat improvement and vegetation restoration of the molybdenum-nickel mine waste residue.

[0029] In the present invention, unless otherwise specified, the raw materials used are conventional commercial products in the art.

[0030] The method comprises mixing the molybdenum-nickel ore waste residue to be treated with a bactericide to stabilize the mixture, and then mixing and aging the mixture with red mud, sewage sludge and cow dung to obtain an improved mixture.

[0031] In the present invention, the sludge is preferably urban surplus activated sludge.

[0032] In the present invention, before the mixing, the molybdenum-nickel ore waste residue, red mud, sludge and cow dung to be treated are preferably naturally air-dried, crushed and sieved in sequence.

[0033] The present invention has no special restrictions on the natural air drying and crushing methods, and the technical solutions well known in the art can be used. In the present invention, the particle size of the sieved material is preferably ≤3 mm, more preferably ≤2 mm. The present invention facilitates the uniform mixing of the bactericide and the molybdenum-nickel ore waste residue, red mud, sludge, and cow dung to be treated through sieving, thereby achieving the inhibition of the activity of acidophilic oxidizing bacteria in the molybdenum-nickel ore waste residue and improving the acidification inhibition effect.

[0034] In the present invention, the ratio of the volume of the fungicide to the mass of the molybdenum-nickel ore waste is preferably (30-50) mL:100 g, more preferably 40 mL:100 g. In the present invention, the amount of red mud added is preferably 4wt%-8wt% of the molybdenum-nickel ore waste, more preferably 5wt% of the molybdenum-nickel ore waste; the amount of sludge added is preferably 4wt%-8wt% of the molybdenum-nickel ore waste, more preferably 5wt% of the molybdenum-nickel ore waste; the amount of cow dung added is preferably 4wt%-8wt% of the molybdenum-nickel ore waste, more preferably 5wt% of the molybdenum-nickel ore waste. The present invention controls the amount of fungicide, red mud, sludge, and cow dung within the above range to effectively reduce the acidity of the molybdenum-nickel ore waste, and permanently inhibit the acidification of the molybdenum-nickel ore waste, and regulate the acidity to improve the vegetation conditions of the waste.

[0035] In the present invention, the fungicide is an aqueous solution of at least one of sodium dodecyl sulfate, kasone and triclosan. In the present invention, when the fungicide is an aqueous solution of sodium dodecyl sulfate, the concentration of sodium dodecyl sulfate in the fungicide is preferably 15-30 mg / L, more preferably 18-25 mg / L, more preferably 20 mg / L. In the present invention, when the fungicide is an aqueous solution of triclosan, the concentration of triclosan in the fungicide is preferably 45-80 mg / L, more preferably 50-70 mg / L, more preferably 60 mg / L. In the present invention, when the fungicide is an aqueous solution of kasone, the concentration of kasone in the fungicide is preferably 25-40 mg / L, more preferably 28-35 mg / L, more preferably 32 mg / L. The present invention effectively reduces the environmental risk of the fungicide and efficiently inhibits the activity of acidophilic microorganisms and acidity regulation of molybdenum-nickel ore waste by controlling the concentration and dosage of the fungicide, thereby achieving thorough and long-term inhibition of the activity of acidophilic oxidizing bacteria, and efficiently solving environmental problems such as high-hydrochloric acid wastewater and heavy metal dissolution generated by acidification of molybdenum-nickel ore waste.

[0036] In the present invention, the mixing method is preferably: after mixing the molybdenum-nickel ore waste residue to be treated with the fungicide, red mud, sewage sludge and cow dung are added.

[0037] In the present invention, the aging is preferably standing at room temperature for 1 to 3 days, more preferably standing at room temperature for 1 to 2 days. The present invention promotes the bactericide to fully inhibit the activity of acidophilic oxidizing bacteria in molybdenum-nickel ore waste residue through aging, and utilizes the rich carbon, nitrogen, phosphorus, sulfur, potassium and other nutrient elements and a large number of beneficial microorganisms in urban residual activated sludge and cow dung to effectively increase the organic matter and nutrient content of molybdenum-nickel ore waste residue, improve the physical structure of the waste residue, and achieve effective regulation of the acidity regulation and habitat improvement of molybdenum-nickel ore waste residue.

[0038] After obtaining the improved mixture, the present invention sows herbaceous plant seeds on the molybdenum-nickel ore waste residue, then covers the improved mixture, and performs regular maintenance to achieve waste residue habitat improvement and vegetation restoration.

[0039] In the present invention, after sowing the herbaceous plant seeds, preferably no additional soil covering is required.

[0040] In the present invention, the herbaceous plant seeds are preferably ryegrass seeds; and the regular maintenance preferably includes regular watering.

[0041] The present invention utilizes sodium dodecyl sulfate, kasone and triclosan as organic microbial inhibitors, which can effectively inhibit the activity of acidophilic oxidizing bacteria in molybdenum-nickel ore waste residue, inhibit the release of heavy metals and sulfates, and synergistically utilize red mud, sludge and cow dung that contain rich nutrients and a large number of beneficial microorganisms to effectively increase the organic matter and nutrient content of molybdenum-nickel ore waste residue, improve the physical structure of the waste residue, and combine with vegetation restoration to effectively slow down the release of pollutants, effectively inhibit the acidification of molybdenum-nickel ore waste residue, and significantly improve the habitat of molybdenum-nickel ore waste residue.

[0042] 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.

[0043] The molybdenum-nickel ore waste slag to be treated collected in Comparative Example 1 and Examples 1 to 3 of the present invention are all molybdenum-nickel ore waste slag with a pH value of 3.2 from the molybdenum-nickel ore slag field in Maoshi Town, Huichuan District, Zunyi City, Guizhou Province.

[0044] Example 1

[0045] A method for restoring vegetation from molybdenum-nickel ore waste residue, comprising the following steps:

[0046] (S1) collecting the pending molybdenum-nickel ore waste residue, red mud, sludge, and cow dung and performing natural air drying, crushing, and sieving respectively, to obtain materials with a particle size of ≦2 mm for standby use; 500 g of the sieved molybdenum-nickel ore waste residue was filled in a plastic basin with a diameter of 16 cm and a height of 11.5 cm, and then 200 mL of an aqueous solution of sodium lauryl sulfate with a concentration of 20 mg / L was added, and after mixing evenly and stabilizing for 2 days, red mud, urban residual activated sludge, and cow dung were added, and aged for 2 days to obtain an improved mixture;

[0047] The amount of red mud added is 5% of the mass of the molybdenum-nickel ore waste residue, the amount of urban surplus activated sludge added is 5% of the mass of the molybdenum-nickel ore waste residue, and the amount of cow dung added is 5% of the mass of the molybdenum-nickel ore waste residue;

[0048] (S2) sowing ryegrass seeds on part of the improved mixture obtained in step (S1), and then covering the improved mixture obtained in the remaining step (S1), and performing regular watering and maintenance to achieve habitat improvement and vegetation restoration of molybdenum-nickel mine waste.

[0049] Example 2

[0050] A method for restoring vegetation from molybdenum-nickel ore waste residue, comprising the following steps:

[0051] (S1) collecting the pending molybdenum-nickel ore waste residue, red mud, sludge, and cow dung and performing natural air drying, crushing, and sieving respectively, to obtain materials with a particle size of ≦2 mm for standby use; 500 g of the sieved molybdenum-nickel ore waste residue was filled in a plastic basin with a diameter of 16 cm and a height of 11.5 cm, and then 200 mL of an aqueous solution of 60 mg / L of Kasson was added, and after mixing evenly and stabilizing for 2 days, red mud, urban residual activated sludge, and cow dung were added, and aged for 2 days to obtain an improved mixture;

[0052] The amount of red mud added is 5% of the mass of the molybdenum-nickel ore waste residue, the amount of sludge added is 5% of the mass of the molybdenum-nickel ore waste residue, and the amount of cow dung added is 5% of the mass of the molybdenum-nickel ore waste residue;

[0053] (S2) sowing ryegrass seeds on part of the improved mixture obtained in step (S1), and then covering the improved mixture obtained in the remaining step (S1), and performing regular watering and maintenance to achieve habitat improvement and vegetation restoration of molybdenum-nickel mine waste.

[0054] Example 3

[0055] A method for restoring vegetation from molybdenum-nickel ore waste residue, comprising the following steps:

[0056] (S1) collecting the pending molybdenum-nickel ore waste residue, red mud, sludge, and cow dung and performing natural air drying, crushing, and sieving respectively, to obtain materials with a particle size of ≦2 mm for standby use; 500 g of the sieved molybdenum-nickel ore waste residue was filled in a plastic basin with a diameter of 16 cm and a height of 11.5 cm, and then 200 mL of an aqueous solution of triclosan with a concentration of 32 mg / L was added, and after mixing evenly and stabilizing for 2 days, red mud, urban residual activated sludge, and cow dung were added, and aged for 2 days to obtain an improved mixture;

[0057] The amount of red mud added is 5% of the mass of the molybdenum-nickel ore waste residue, the amount of sludge added is 5% of the mass of the molybdenum-nickel ore waste residue, and the amount of cow dung added is 5% of the mass of the molybdenum-nickel ore waste residue;

[0058] (S2) sowing ryegrass seeds on part of the improved mixture obtained in step (S1), and then covering the improved mixture obtained in the remaining step (S1), and performing regular watering and maintenance to achieve habitat improvement and vegetation restoration of molybdenum-nickel mine waste.

[0059] Comparative Example 1

[0060] A method for restoring vegetation from molybdenum-nickel ore waste residue, comprising the following steps:

[0061] (S1) collecting the pending molybdenum-nickel ore waste residue, red mud, sludge, and cow dung and performing natural air drying, crushing, and sieving respectively, to obtain materials with a particle size of ≦2 mm for standby use; 500 g of the sieved molybdenum-nickel ore waste residue was filled in a plastic basin with a diameter of 16 cm and a height of 11.5 cm, and then red mud, urban residual activated sludge, and cow dung were added, mixed evenly, and aged for 2 days to obtain an improved mixture;

[0062] The amount of red mud added is 5% of the mass of the molybdenum-nickel ore waste residue, the amount of sludge added is 5% of the mass of the molybdenum-nickel ore waste residue, and the amount of cow dung added is 5% of the mass of the molybdenum-nickel ore waste residue;

[0063] (S2) sowing ryegrass seeds on the improved mixture obtained in part of step (S1), then covering the remaining improved mixture, and performing regular watering and maintenance to achieve habitat improvement of molybdenum-nickel ore waste.

[0064] Comparative Example 2

[0065] Ryegrass seeds are sown on the improved mixture obtained in step (S1) of Comparative Example 1, and then covered with molybdenum-nickel ore waste residue that has not been treated in any way, and watered regularly for maintenance.

[0066] The leachate of the molybdenum-nickel ore waste residue after watering in Examples 1 to 3 and Comparative Examples 1 and 2 was collected regularly to analyze the change trend of its pH value, sulfate concentration and conductivity over time.

[0067] Figure 1 The pH value of the leachate of molybdenum-nickel ore waste residue collected in Comparative Examples 1 and 2 and Examples 1 to 3 varies with time. Figure 1 It can be seen that when the molybdenum-nickel ore waste slag in Comparative Example 2 was not treated, its pH value was only maintained at about 3.3, while the pH value of the leachate of the molybdenum-nickel ore waste slag in Comparative Example 1 and Examples 1 to 3 gradually increased. The pH value of Comparative Example 1 reached a maximum value on the 3rd day, and the pH values ​​of Examples 1 and 3 both reached a maximum value on the 14th day and remained stable within 60 days. The pH value of Example 3 reached a maximum value on the 7th day, but decreased at the 45th day, so Example 3 was relatively unstable.

[0068] Figure 2 The redox potential (abbreviated as Eh) of the molybdenum-nickel ore waste slag leachate collected in Comparative Examples 1 and 2 and Examples 1 to 3 of the present invention changes with time. Figure 2 It can be seen that when the molybdenum-nickel ore waste slag in Comparative Example 2 was not treated, its redox potential remained stable at a relatively high level, while the redox potential of the molybdenum-nickel ore waste slag leachate in Comparative Example 1, Example 1, Example 2, and Example 3 all decreased, among which Example 1 and Example 3 remained stable within 60 days after the redox potential reached the minimum value on the 14th day.

[0069] Figure 3 The sulfate concentration in the leachate of molybdenum-nickel ore waste residue collected in Comparative Examples 1 and 2 and Examples 1 to 3 of the present invention varies with time. Figure 3 It can be seen that when the molybdenum-nickel ore waste residue in Comparative Example 2 was not treated, its sulfate concentration remained stable within 60 days; as the time after the improved treatment was extended, the sulfate concentrations in Examples 1 and 2 were significantly reduced and remained stable within 60 days. In Comparative Example 1, since no bactericide was added to inhibit the activity of acidophilic oxidizing bacteria, its sulfate concentration did not change significantly.

[0070] Figure 4 The figure is a bar graph showing the average plant height of ryegrass at 30 days after sowing in Comparative Examples 1 and 2 and Examples 1 to 3 of the present invention. Figure 4 It can be seen that in Comparative Example 2, when the molybdenum-nickel ore waste residue was not treated, the germination rate was low and the vegetation did not grow on the 30th day after the ryegrass seeds were sown. Although a small number of seeds germinated in Comparative Example 1, the growth was relatively slow and ultimately limited, with an average height of only about 13 cm. The ryegrasses in Examples 1 to 3 all showed good growth, not only growing vigorously, but also maintaining an average plant height of about 20 cm on the 30th day.

[0071] In summary, the method provided by the present invention, using the combined methods of acidophilic oxidizing bacteria activity inhibition-acidity regulation-nutrient conditioning-vegetation restoration, can quickly achieve molybdenum-nickel mine waste habitat improvement and vegetation restoration, among which Example 1 has the best restoration effect, that is, the addition amount of red mud is 5%, the addition amount of sludge is 5%, the addition amount of cow dung is 5%, and the addition amount of an aqueous solution of sodium dodecyl sulfate with a concentration of 20 mg / L is 40 mL / 100 g molybdenum-nickel mine waste, and the restoration effect of the molybdenum-nickel mine waste yard is the best.

[0072] 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 restoring vegetation from molybdenum-nickel ore waste residue, characterized in that: The following steps are involved: (S1) mixing the to-be-processed molybdenum-nickel ore waste residue with a bactericide to stabilize it, and then mixing and aging it with red mud, sewage sludge and cow dung to obtain an improved mixture; The volume ratio of the bactericide to the mass of the molybdenum-nickel ore waste is (20-60) mL: 100 g, the amount of red mud added is 3wt%-10wt% of the molybdenum-nickel ore waste, the amount of sludge added is 3wt%-10wt% of the molybdenum-nickel ore waste, and the amount of cow dung added is 3wt%-10wt% of the molybdenum-nickel ore waste; (S2) sowing herbaceous plant seeds on the molybdenum-nickel mine waste residue, then covering it with the improved mixture obtained in the step (S1), and performing regular maintenance to achieve the improvement of the molybdenum-nickel mine waste residue and the restoration of vegetation.

2. The method according to claim 1, characterized in that Before mixing in the step (S1), the molybdenum-nickel ore waste residue, red mud, sludge and cow dung to be treated are naturally air-dried, crushed and sieved in sequence.

3. The method according to claim 1, characterized in that In the step (S1), the bactericide is an aqueous solution of at least one of sodium lauryl sulfate, kasone and triclosan.

4. The method according to claim 1, characterized in that: In the step (S1), when the fungicide is an aqueous solution of sodium dodecyl sulfate, the concentration of sodium dodecyl sulfate in the fungicide is 15 to 30 mg / L.

5. The method according to claim 1, characterized in that In the step (S1), when the fungicide is an aqueous solution of triclosan, the concentration of triclosan in the fungicide is 45 to 80 mg / L.

6. The method according to claim 1, characterized in that In the step (S1), when the fungicide is an aqueous solution of kasperone, the concentration of kasperone in the fungicide is 25-40 mg / L.

7. The method according to claim 1, characterized in that In the step (S1), the molybdenum-nickel ore waste residue to be treated is first mixed with a fungicide.

8. The method according to claim 1, characterized in that The aging in the step (S1) is performed by standing at room temperature for 1 to 3 days.

9. The method according to claim 1, characterized in that: In the step (S2), no additional soil covering is required after sowing the herbaceous plant seeds.

10. The method according to claim 1, characterized in that In the step (S2), the herbaceous plant seeds are ryegrass seeds, and the regular maintenance includes regular watering.

Images