Method for inhibiting acidification of molybdenum-nickel ore waste residues

Abstract

The invention provides a method for inhibiting acidification of molybdenum-nickel ore waste residues, and belongs to the technical field of waste residue treatment. According to the method, certain types of bacteriostatic agents are used for damaging cell membranes of acidophilic oxidizing bacteria, so that intracellular protein overflows into bacterial liquid, lipid flows out, internal structures of the bacteria are destroyed, and the problem of acidification caused by physiological activities of the acidophilic oxidizing bacteria in the molybdenum-nickel ore waste residues is effectively controlled; and the adopted bacteriostatic agent has low toxicity, effectiveness, economy and durability, the environmental risk of the bacteriostatic agent is effectively reduced by controlling the concentration and dosage of the bacteriostatic agent, and long-acting inhibition of the activity of acidophilic oxidizing bacteria in the molybdenum-nickel ore waste residues and control of generation of acidic wastewater containing sulfate and heavy metal are achieved. In addition, the method provided by the invention is simple, easy to operate, low in cost, good in effect and high in durability, and can effectively reduce and inhibit the environmental risk of the waste residues after acidizing treatment.

Description

Technical Field

[0001] The invention relates to the technical field of waste residue treatment, and in particular to a method for inhibiting the acidification of molybdenum-nickel ore waste residue. Background Art

[0002] With the continuous deepening of mining activities in recent years, a large amount of waste slag has caused significant harm to the surrounding environment, and environmental problems have become increasingly prominent. The environmental problems caused by molybdenum-nickel ore waste have gradually attracted widespread attention from many scholars. my country is rich in molybdenum-nickel ore resources, mainly sedimentary black shale deposits, with complex composition, containing a variety of metals and non-metallic elements such as Mo, Ni, V, Cu, Pt, Mn, Se, etc. Molybdenum-nickel ore is mainly distributed in the main mineralization areas of polymetallic deposits and precious metal mineralization, including Zunyi, Guizhou, Zhangjiajie, Hunan, Yunnan, and Fuyang, Zhejiang. Especially in Guizhou, molybdenum-nickel ore resources are relatively rich and have been developed and utilized on a large scale in history. Guizhou molybdenum-nickel-vanadium ore is produced in the Lower Cambrian black rock system, and the mining areas are mainly distributed in Zunyi City, Zhijin Nayong, Tongren City, and Qiandongnan Miao and Buyi Autonomous Prefecture. A large amount of molybdenum-nickel ore waste is treated by open-air storage. Due to long-term exposure to the natural environment, it is continuously exposed to natural factors such as air, moisture and microorganisms, and continuously releases a large amount of harmful pollutants, including toxic heavy metal ions and sulfate ions (SO4 2- ), resulting in the generation of a large amount of acid mine drainage (AMD). These pollutants not only seriously damage the ecological environment around the mining area, but also pose a potential threat to human health through the food chain.

[0003] At present, surface covering technology is a widely used source control method for acid mine wastewater. This technology is to form an isolation barrier by laying a cover layer on the surface of mining waste to reduce the entry of oxygen and precipitation and reduce the oxidation rate of sulfide minerals. However, these can only control the weathering and acid production of molybdenum-nickel ore waste by controlling a single factor (such as dissolved oxygen and water) that affects the oxidation of sulfur-containing minerals in the waste. In the acid production process of molybdenum-nickel ore waste, the biocatalysis of acidophilic microorganisms plays a leading role in the acid production process of waste. And the biocatalysis of acidophilic oxidizing bacteria significantly affects the oxidation process of sulfur-containing minerals in molybdenum-nickel ore waste, mainly represented by acidophilic ferrothiobacillus oxidans, which can significantly increase the rate of oxidation reaction of divalent ferrous ions to generate trivalent ferrous ions, which is an important cause of acidification pollution of molybdenum-nickel ore waste. However, there are few reports on antibacterial agents for acidification pollution of molybdenum-nickel ore waste. Therefore, it is of great significance to select an antibacterial agent with good effect, low price and easy degradation to control the acidification of molybdenum-nickel ore waste. Summary of the invention

[0004] The purpose of the present invention is to provide a method for inhibiting the acidification of molybdenum-nickel ore waste residue. The method provided by the present invention breaks the bottleneck of the traditional method, has the advantages of small footprint, can effectively control the acidification of molybdenum-nickel ore waste residue and the release of pollutants, and has the advantages of short processing time and low cost. It can be widely used in tailings rich in sulfide minerals.

[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 inhibiting the acidification of molybdenum-nickel ore waste residue, comprising the following steps:

[0007] (S1) pre-treating the to-be-treated molybdenum-nickel ore waste residue to obtain the pre-treated molybdenum-nickel ore waste residue, and then adding an antibacterial agent to mix to obtain a mixture;

[0008] The antibacterial agent is an aqueous solution of at least one of sodium lauryl sulfate, triclosan and kasone;

[0009] (S2) subjecting the mixture obtained in step (S1) to static aging to obtain aged molybdenum-nickel ore waste residue;

[0010] (S3) regularly spraying water on the surface of the aged molybdenum-nickel ore waste slag obtained in the step (S2) to maintain the moisture content of the molybdenum-nickel ore waste slag after the antibacterial treatment, thereby achieving the purpose of inhibiting the acidification of the molybdenum-nickel ore waste slag.

[0011] Preferably, the pretreatment in step (S1) comprises: naturally air-drying the molybdenum-nickel ore waste slag to be treated, and then crushing and screening them in sequence to obtain pretreated molybdenum-nickel ore waste slag.

[0012] Preferably, in the step (S1), the antibacterial agent accounts for 30% to 50% of the mass of the pretreated molybdenum-nickel ore waste residue.

[0013] Preferably, in the step (S1), when the antibacterial agent is an aqueous solution of sodium dodecyl sulfate, the concentration of sodium dodecyl sulfate in the antibacterial agent is 15 to 30 mg / L.

[0014] Preferably, in the step (S1), when the antibacterial agent is an aqueous solution of triclosan, the concentration of triclosan in the antibacterial agent is 45 to 80 mg / L.

[0015] Preferably, in the step (S1), when the antibacterial agent is an aqueous solution of kasone, the concentration of the aqueous solution of kasone is 25 to 40 mg / L.

[0016] Preferably, the antibacterial agent in step (S1) is a mixed solution obtained by mixing equal volumes of an aqueous solution of sodium dodecyl sulfate with a concentration of 6 to 16 mg / L and an aqueous solution of triclosan with a concentration of 13 to 20 mg / L.

[0017] Preferably, the static aging in step (S2) is natural air drying for 20 to 72 hours.

[0018] Preferably, after the regular watering in step (S3), the step further includes: regularly collecting the leachate of the molybdenum-nickel ore waste slag after the antibacterial treatment to analyze the acidity regulation effect.

[0019] Preferably, the water content of the molybdenum-nickel ore waste residue after the antibacterial treatment in step (S3) is 35% to 55%.

[0020] The present invention provides a method for inhibiting the acidification of molybdenum-nickel ore waste residue. Since the acidophilic microorganisms in the molybdenum-nickel ore waste residue promote the acidification of the waste residue through their physiological activities, the present invention uses a certain type of antibacterial agent to damage the cell membrane of acidophilic oxidizing bacteria (such as ferrothiobacillus, thiothiobacillus oxidans, etc.), so that the intracellular protein overflows into the bacterial solution, the lipid flows out, and the internal structure of the bacteria is destroyed, and the acidification problem caused by the physiological activities of acidophilic oxidizing bacteria in the molybdenum-nickel ore waste residue is effectively controlled; and the antibacterial agent used in the present invention has low toxicity, effectiveness, economy and durability. By controlling the concentration and dosage of the antibacterial agent, its environmental risk is effectively reduced, and the long-term inhibition of the activity of acidophilic oxidizing bacteria in the molybdenum-nickel ore waste residue and the control of the generation of acidic wastewater containing sulfate and heavy metals are achieved. In addition, the method provided by the present invention is simple, easy to operate, low in cost, good in effect and strong in durability, and can effectively reduce the environmental risk of the waste residue after the acidification treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The pH value of the leachate of molybdenum-nickel ore waste residue collected in Comparative Example 1 and Examples 1 to 5 is a trend chart of changes over time;

[0022] Figure 2 The redox potential (abbreviated as Eh) of the molybdenum-nickel ore waste residue leachate collected in Comparative Example 1 and Examples 1 to 5 of the present invention varies with time;

[0023] Figure 3 This is a graph showing the OD value changes of the molybdenum-nickel ore waste residue leachate collected in Comparative Example 1 and Examples 1 to 5 of the present invention after being cultured for seven days. DETAILED DESCRIPTION

[0024] The present invention provides a method for inhibiting the acidification of molybdenum-nickel ore waste residue, comprising the following steps:

[0025] (S1) pre-treating the to-be-treated molybdenum-nickel ore waste residue to obtain the pre-treated molybdenum-nickel ore waste residue, and then adding an antibacterial agent to mix to obtain a mixture;

[0026] The antibacterial agent is an aqueous solution of at least one of sodium lauryl sulfate, triclosan and kasone;

[0027] (S2) subjecting the mixture obtained in step (S1) to static aging to obtain aged molybdenum-nickel ore waste residue;

[0028] (S3) regularly spraying water on the surface of the aged molybdenum-nickel ore waste slag obtained in the step (S2) to maintain the moisture content of the molybdenum-nickel ore waste slag after the antibacterial treatment, thereby achieving the purpose of inhibiting the acidification of the molybdenum-nickel ore waste slag.

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

[0030] The invention pre-treats the molybdenum-nickel ore waste residue to be treated to obtain the pre-treated molybdenum-nickel ore waste residue, and then adds an antibacterial agent to mix and obtain a mixture.

[0031] In the present invention, the pretreatment preferably includes: naturally air-drying the molybdenum-nickel ore waste slag to be treated, and then crushing and screening them in sequence to obtain pretreated molybdenum-nickel ore waste slag.

[0032] The present invention has no special restrictions on the crushing and screening methods, and the pretreated molybdenum-nickel ore waste slag of the target particle size can be obtained by adopting the technical solutions well known in the art. In the present invention, the particle size of the pretreated molybdenum-nickel ore waste slag is preferably ≤3mm, more preferably ≤2mm. The present invention controls the particle size of the pretreated molybdenum-nickel ore waste slag within the above range, which is conducive to the uniform mixing of the antibacterial agent and the pretreated molybdenum-nickel ore waste slag, effectively inhibiting the oxidizing bacteria in the pretreated molybdenum-nickel ore waste slag, and improving the acidification inhibition effect.

[0033] In the present invention, the antibacterial agent accounts for 30% to 50% of the mass of the pretreated molybdenum-nickel ore waste, and more preferably 35% to 45%. The present invention controls the amount of the antibacterial agent within the above range, effectively reduces its environmental risk, achieves long-term inhibition of the activity of acidophilic oxidizing bacteria in molybdenum-nickel ore waste, and controls the generation of acidic wastewater containing sulfate and heavy metals.

[0034] In the present invention, when the antibacterial agent is an aqueous solution of sodium dodecyl sulfate, the concentration of sodium dodecyl sulfate in the antibacterial agent is preferably 15 to 30 mg / L, more preferably 18 to 25 mg / L, and further preferably 20 mg / L.

[0035] In the present invention, when the antibacterial agent is an aqueous solution of triclosan, the concentration of triclosan in the antibacterial agent is preferably 45 to 80 mg / L, more preferably 50 to 70 mg / L, and even more preferably 60 mg / L.

[0036] In the present invention, when the antibacterial agent is an aqueous solution of kasone, the concentration of the aqueous solution of kasone is preferably 25 to 40 mg / L, more preferably 28 to 35 mg / L, and further preferably 32 mg / L.

[0037] In the present invention, when the antibacterial agent is a mixed solution obtained by mixing equal volumes of an aqueous solution of sodium dodecyl sulfate and an aqueous solution of triclosan, the concentration of sodium dodecyl sulfate in the antibacterial agent is 6 to 16 mg / L, more preferably 8 to 12 mg / L, and further preferably 10 mg / L; the concentration of triclosan in the antibacterial agent is 13 to 20 mg / L, more preferably 15 to 18 mg / L, and further preferably 16 mg / L.

[0038] In the present invention, when the antibacterial agent is a mixed solution obtained by mixing equal volumes of an aqueous solution of sodium dodecyl sulfate and an aqueous solution of kassonite, the concentration of sodium dodecyl sulfate in the antibacterial agent is 6 to 16 mg / L, more preferably 8 to 12 mg / L, and further preferably 10 mg / L; the concentration of kassonite in the antibacterial agent is 23 to 38 mg / L, more preferably 25 to 35 mg / L, and further preferably 30 mg / L.

[0039] After obtaining the mixture, the present invention performs static aging on the mixture to obtain aged molybdenum-nickel ore waste slag.

[0040] In the present invention, the static aging is preferably natural air drying for 20 to 72 hours, more preferably natural air drying for 24 to 48 hours. The present invention promotes the antibacterial agent to fully inhibit the activity of acidophilic oxidizing bacteria in molybdenum-nickel ore waste residue by static aging.

[0041] After obtaining the aged molybdenum-nickel ore waste slag, the present invention regularly sprinkles water on the surface of the aged molybdenum-nickel ore waste slag to maintain the water content of the molybdenum-nickel ore waste slag after antibacterial treatment, thereby achieving the purpose of inhibiting the acidification of the molybdenum-nickel ore waste slag.

[0042] In the present invention, after the regular watering, the method further comprises: regularly collecting the leachate of the molybdenum-nickel ore waste residue after the antibacterial treatment to analyze the acidity regulation effect.

[0043] In the present invention, the water content of the molybdenum-nickel ore waste residue after the antibacterial treatment is preferably 35% to 55%, and more preferably 40% to 50%. The present invention controls the water content of the molybdenum-nickel ore waste residue within the above range, and uses an antibacterial agent to coat the surface of the molybdenum-nickel ore waste residue after the antibacterial treatment to achieve long-term inhibition of acidophilic oxidizing bacteria, and effectively control the environmental problems caused by acid wastewater containing sulfate and heavy metals produced by acidification of molybdenum-nickel ore waste residue.

[0044] 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.

[0045] The molybdenum-nickel ore waste residues to be treated collected in Comparative Example 1 and Examples 1 to 5 of the present invention are all from Maoshi Town, Tongzi County, Zunyi City, and the pH value of the molybdenum-nickel ore waste residues is 3.2.

[0046] Example 1

[0047] A method for inhibiting the acidification of molybdenum-nickel ore waste residue, comprising the following steps:

[0048] (S1) the collected molybdenum-nickel ore waste residue to be treated is naturally air-dried and crushed, and sieved to obtain pre-treated molybdenum-nickel ore waste residue with a particle size of ≤2 mm for standby use;

[0049] Weigh 500 g of pretreated molybdenum-nickel ore waste residue and place it in a PP plastic cup, add 200 mL of an aqueous solution of sodium dodecyl sulfate with a concentration of 20 mg / L, and mix them thoroughly to obtain a mixture;

[0050] (S2) subjecting the mixture obtained in step (S1) to standing and aging for 24 hours to obtain aged molybdenum-nickel ore waste residue;

[0051] (S3) regularly spraying water on the surface of the aged molybdenum-nickel ore waste slag obtained in the step (S2) to keep the moisture content of the molybdenum-nickel ore waste slag after antibacterial treatment at 40% to 50%, and regularly collecting the leachate of the molybdenum-nickel ore waste slag after antibacterial treatment to analyze the acidity regulation effect, so as to achieve the purpose of inhibiting the acidification of the molybdenum-nickel ore waste slag.

[0052] Example 2

[0053] A method for inhibiting the acidification of molybdenum-nickel ore waste residue, comprising the following steps:

[0054] (S1) the collected molybdenum-nickel ore waste residue to be treated is naturally air-dried and crushed, and sieved to obtain pre-treated molybdenum-nickel ore waste residue with a particle size of ≤2 mm for standby use;

[0055] Weigh 500 g of pretreated molybdenum-nickel ore waste residue and put it in a PP plastic cup, add 200 mL of an aqueous solution of 60 mg / L of Kasson, and mix them thoroughly to obtain a mixture;

[0056] (S2) subjecting the mixture obtained in step (S1) to standing and aging for 24 hours to obtain aged molybdenum-nickel ore waste residue;

[0057] (S3) regularly spraying water on the surface of the aged molybdenum-nickel ore waste slag obtained in the step (S2) to keep the moisture content of the molybdenum-nickel ore waste slag after antibacterial treatment at 40% to 50%, and regularly collecting the leachate of the molybdenum-nickel ore waste slag after antibacterial treatment to analyze the acidity regulation effect, so as to achieve the purpose of inhibiting the acidification of the molybdenum-nickel ore waste slag.

[0058] Example 3

[0059] A method for inhibiting the acidification of molybdenum-nickel ore waste residue, comprising the following steps:

[0060] (S1) the collected molybdenum-nickel ore waste residue to be treated is naturally air-dried and crushed, and sieved to obtain pre-treated molybdenum-nickel ore waste residue with a particle size of ≤2 mm for standby use;

[0061] Weigh 500 g of pretreated molybdenum-nickel ore waste residue and place it in a PP plastic cup, add 200 mL of an aqueous solution of triclosan with a concentration of 32 mg / L, and mix them thoroughly to obtain a mixture;

[0062] (S2) subjecting the mixture obtained in step (S1) to standing and aging for 24 hours to obtain aged molybdenum-nickel ore waste residue;

[0063] (S3) regularly spraying water on the surface of the aged molybdenum-nickel ore waste slag obtained in the step (S2) to keep the moisture content of the molybdenum-nickel ore waste slag after antibacterial treatment at 40% to 50%, and regularly collecting the leachate of the molybdenum-nickel ore waste slag after antibacterial treatment to analyze the acidity regulation effect, so as to achieve the purpose of inhibiting the acidification of the molybdenum-nickel ore waste slag.

[0064] Example 4

[0065] A method for inhibiting the acidification of molybdenum-nickel ore waste residue, comprising the following steps:

[0066] (S1) the collected molybdenum-nickel ore waste residue to be treated is naturally air-dried and crushed, and sieved to obtain pre-treated molybdenum-nickel ore waste residue with a particle size of ≤2 mm for standby use;

[0067] Weigh 500 g of pretreated molybdenum-nickel ore waste residue and place it in a PP plastic cup, add 200 mL of an antibacterial agent, and mix them thoroughly to obtain a mixture;

[0068] The antibacterial agent is a mixed solution obtained by mixing an aqueous solution of sodium dodecyl sulfate with a concentration of 10 mg / L and an aqueous solution of kasone with a concentration of 30 mg / L in equal volumes;

[0069] (S2) subjecting the mixture obtained in step (S1) to standing and aging for 24 hours to obtain aged molybdenum-nickel ore waste residue;

[0070] (S3) regularly spraying water on the surface of the aged molybdenum-nickel ore waste slag obtained in the step (S2) to keep the moisture content of the molybdenum-nickel ore waste slag after antibacterial treatment at 40% to 50%, and regularly collecting the leachate of the molybdenum-nickel ore waste slag after antibacterial treatment to analyze the acidity regulation effect, so as to achieve the purpose of inhibiting the acidification of the molybdenum-nickel ore waste slag.

[0071] Example 5

[0072] A method for inhibiting the acidification of molybdenum-nickel ore waste residue, comprising the following steps:

[0073] (S1) the collected molybdenum-nickel ore waste residue to be treated is naturally air-dried and crushed, and sieved to obtain pre-treated molybdenum-nickel ore waste residue with a particle size of ≤2 mm for standby use;

[0074] Weigh 500 g of pretreated molybdenum-nickel ore waste residue and place it in a PP plastic cup, add 200 mL of an antibacterial agent, and mix them thoroughly to obtain a mixture;

[0075] The antibacterial agent is a mixed solution obtained by mixing equal volumes of an aqueous solution of sodium dodecyl sulfate with a concentration of 10 mg / L and an aqueous solution of triclosan with a concentration of 16 mg / L;

[0076] (S2) subjecting the mixture obtained in step (S1) to standing and aging for 24 hours to obtain aged molybdenum-nickel ore waste residue;

[0077] (S3) regularly spraying water on the surface of the aged molybdenum-nickel ore waste slag obtained in the step (S2) to keep the moisture content of the molybdenum-nickel ore waste slag after antibacterial treatment at 40% to 50%, and regularly collecting the leachate of the molybdenum-nickel ore waste slag after antibacterial treatment to analyze the acidity regulation effect, so as to achieve the purpose of inhibiting the acidification of the molybdenum-nickel ore waste slag.

[0078] Comparative Example 1

[0079] Molybdenum-nickel ore waste slag without antibacterial treatment.

[0080] Comparative Example 1 was used as a control group, and Examples 1 to 5 of the present invention were used as experimental groups. 200 ml of distilled water was sprayed into the molybdenum-nickel ore waste residue after antibacterial treatment in the control group and the experimental group respectively on a regular basis, and then the leachate of the molybdenum-nickel ore waste residue was collected to determine the pH value, sulfate concentration and conductivity change trend over time. After the analysis was completed, the leachate of the molybdenum-nickel ore waste residue in Comparative Example 1 and Examples 1 to 5 of the present invention was collected as the bacterial solution of the molybdenum-nickel ore waste residue, and cultured for 7 days. At different time points during the culture period, the OD value was measured to evaluate the activity of the acidophilic oxidizing bacteria.

[0081] Figure 1 The pH value of the molybdenum-nickel ore waste residue leachate collected in Comparative Example 1 and Examples 1 to 5 varies with time. Figure 1 It can be seen that the pH value of Comparative Example 1 without the application of the antibacterial agent is as low as about 3.1, while the pH value of the molybdenum-nickel ore waste residue leachate in Examples 1 to 5 with the application of the antibacterial agent is effectively improved. It can be seen from the figure that as the time after the antibacterial treatment increases, the pH rises to the highest value within 7 days and then remains stable for 60 days. Among them, Example 1 has the best pH control effect, with the pH rising to above 5 on the 7th day and remaining stable within 60 days.

[0082] Figure 2The following is a graph showing the redox potential (abbreviated as Eh) of the molybdenum-nickel ore waste slag leachate collected in Comparative Example 1 and Examples 1 to 5 over time. Figure 2 It can be seen that as the time of applying the antibacterial agent to the molybdenum-nickel ore waste residue increases, the redox potential of the molybdenum-nickel ore waste residue leachate decreases rapidly within 7 days, and the redox potential of the molybdenum-nickel ore waste residue leachate in Examples 1 to 5 is significantly lower than that of the molybdenum-nickel ore waste residue leachate in Comparative Example 1 without applying the antibacterial agent within 60 days. The antibacterial agent in Examples 1 to 5 significantly inhibits the oxidation of the molybdenum-nickel ore waste residue. Among them, Example 1 has the best effect, and the redox potential is significantly lower than that of other treatments. The redox potential reaches a minimum of about 100 mV on the 7th day and remains stable within 60 days.

[0083] Figure 3 The OD value change diagram of the molybdenum-nickel ore waste residue leachate in Comparative Example 1 and Examples 1 to 5 was collected for seven days. Figure 3 It can be seen that the OD value of Comparative Example 1 without the use of an antibacterial agent was maintained at about 0.2 within 3 days. After the 3rd day, its OD value maintained a significant upward trend and reached about 0.33 on the 7th day, indicating that the number of microbial activities continued to increase and the molybdenum-nickel ore waste was continuously oxidized and acidified by microorganisms. Figure 3 It can be seen that, since Examples 1 to 5 inhibit the acidification of molybdenum-nickel ore waste residue, the OD value of each Example is significantly lower than that of Comparative Example 1 which is not applied; among them, the antibacterial effect of Examples 1, 4 and 5 is more obvious, and the activity of the microorganisms in Example 1 reaches the lowest within 3 days, with an OD value of about 0.07, and then slowly increases, and tends to stabilize at about 0.13 after the 5th day. Although the microbial activity of Examples 4 and 5 is low, the improvement effect of pH and Eh is still poor.

[0084] In summary, the method provided by the present invention utilizes the antibacterial agent to inhibit the acidification of molybdenum-nickel ore waste residue, and shows a strong inhibitory effect within 60 days, wherein the inhibitory effect of microbial activity of Example 1 is more than 50%, and the pH is about 5, and its comprehensive effect is significantly higher than the application of other single antibacterial agents and composite mixed antibacterial agents, which can effectively inhibit the acidification of molybdenum-nickel ore waste residue by microbial oxidation, and the method provided by the present invention is simple to operate, low in cost, and has a lasting effect, and has a good application effect.

[0085] 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 inhibiting the acidification of molybdenum-nickel ore waste residue, characterized in that: The following steps are involved: (S1) pre-treating the to-be-treated molybdenum-nickel ore waste residue to obtain the pre-treated molybdenum-nickel ore waste residue, and then adding an antibacterial agent to mix to obtain a mixture; The antibacterial agent is an aqueous solution of at least one of sodium lauryl sulfate, triclosan and kasone; (S2) subjecting the mixture obtained in step (S1) to static aging to obtain aged molybdenum-nickel ore waste residue; (S3) regularly spraying water on the surface of the aged molybdenum-nickel ore waste slag obtained in the step (S2) to maintain the moisture content of the molybdenum-nickel ore waste slag after the antibacterial treatment, thereby achieving the purpose of inhibiting the acidification of the molybdenum-nickel ore waste slag.

2. The method according to claim 1, characterized in that The pretreatment in step (S1) comprises: naturally air-drying the molybdenum-nickel ore waste slag to be treated, and then crushing and sieving them in sequence to obtain pretreated molybdenum-nickel ore waste slag.

3. The method according to claim 2, characterized in that The amount of the antibacterial agent added in the step (S1) accounts for 30% to 50% of the mass of the pretreated molybdenum-nickel ore waste residue.

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

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

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

7. The method according to claim 1, characterized in that In the step (S1), the antibacterial agent is a mixed solution obtained by mixing equal volumes of an aqueous solution of sodium dodecyl sulfate with a concentration of 6 to 16 mg / L and an aqueous solution of triclosan with a concentration of 13 to 20 mg / L.

8. The method according to claim 1, characterized in that The static aging in the step (S2) is natural air drying for 20 to 72 hours.

9. The method according to claim 1, characterized in that: After the regular watering in the step (S3), the step also includes: regularly collecting the leachate of the molybdenum-nickel ore waste residue after the antibacterial treatment to analyze the acidity regulation effect.

10. The method according to claim 1, characterized in that The water content of the molybdenum-nickel ore waste residue after the antibacterial treatment in the step (S3) is 35% to 55%.

Images