Method for oxidizing and leaching zinc leaching residues through ultrasonic-enhanced manganese dioxide

Abstract

The invention relates to the technical field of hydrometallurgy and comprehensive utilization of resources, and discloses a method for oxidizing and leaching zinc leaching residues through ultrasonic-enhanced manganese dioxide. The method for oxidizing and leaching the zinc leaching residues through the ultrasonic-enhanced manganese dioxide comprises the following steps that (1) the zinc leaching residues, the manganese dioxide and a sulfuric acid solution are added into a reactor, and a leaching system is obtained; and 2) carrying out ultrasonic enhanced leaching on the leaching system obtained in the step 1). According to the method for oxidizing and leaching the zinc leaching residues through the ultrasonic-enhanced manganese dioxide, the zinc leaching residues are leached through the cooperation of ultrasonic waves and the manganese dioxide, the leaching rate is increased while the leaching time is shortened, and the production efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrometallurgy and comprehensive utilization of resources. Specifically, it relates to a method for ultrasonic-enhanced oxidative leaching of zinc leaching residues with manganese dioxide. Background Art

[0002] Zinc is an important strategic resource and is widely used in contemporary industrial fields such as alloy manufacturing, electroplating, and battery production. 85% of the global zinc production comes from hydrometallurgical processes. However, a large amount of zinc leaching residues are generated during the hydrometallurgical smelting of zinc. According to statistical data, for every 1 ton of zinc produced, 0.5 - 0.9 tons of zinc leaching residues will be generated. Limited by the recovery efficiency and economic benefits, most enterprises often directly stack these zinc leaching residues, occupying a large amount of land and posing safety hazards such as collapse and dam breakage, and there are also serious environmental pollution problems. The zinc leaching residues contain a large amount of unextracted base metals such as Pb, Cu, and Zn, precious elements such as In, Ag, Ga, Ge, and Sb, and harmful elements such as As and Cd. Therefore, if the valuable metals in the zinc leaching residues can be fully recovered, it will effectively alleviate the shortage of mineral resources.

[0003] The wet treatment of zinc leaching residues includes methods such as acid leaching, alkali leaching, and salt leaching. Among them, acid leaching has attracted much attention. Acid leaching mainly includes traditional acid leaching, pressure acid leaching, and microwave-assisted acid leaching. In industrial production, valuable metals such as zinc, germanium, and indium are usually recovered through a two-step or three-step sulfuric acid leaching process. However, the recovery rates of these valuable metals in traditional processes are usually not high. Therefore, to solve the limitations of the existing technology and improve the resource utilization efficiency, researchers have adopted various methods to enhance the zinc recovery process. For example, Liu et al. used oxygen pressure leaching to treat zinc refining residues, and achieved a gallium leaching rate of 98% and a germanium leaching rate of 94% within 3 hours at a pressure of 0.4 MPa. However, in industrial production, pressure leaching requires high maintenance costs and there are significant risks in actual operation. Therefore, this method is only applicable to laboratory-scale exploration. Abo Atia et al. found that when using microwave-assisted chloride leaching to treat zinc plant residues, the leaching time was significantly shortened compared with leaching without microwave assistance. However, due to the problem of microwave leakage in large-scale industrial applications, this method still remains at the laboratory stage. Therefore, those skilled in the art are urgently in need of finding an environmentally friendly and economically feasible method for recycling and managing a large amount of zinc leaching residues. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for ultrasonic-enhanced oxidative leaching of zinc leaching residues with manganese dioxide. This method for ultrasonic-enhanced oxidative leaching of zinc leaching residues with manganese dioxide can efficiently and economically leach zinc, and has less leaching residue, meeting the requirements of resource utilization and residue reduction.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for ultrasonic-enhanced oxidation leaching of zinc leaching residue with manganese dioxide, comprising the following steps:

[0007] 1) Add zinc leaching residue, manganese dioxide and sulfuric acid solution into a reactor to obtain a leaching system;

[0008] 2) Perform ultrasonic-enhanced leaching on the leaching system obtained in step 1).

[0009] Further, in step 1), the initial concentration of manganese dioxide in the leaching system is 11.11 - 44.44 g / L.

[0010] Further, in step 1), the solid-liquid ratio of the leaching system is 1 g∶(4 - 8) mL.

[0011] Further, in step 1), the initial acidity of the leaching system is 60 - 180 g / L.

[0012] Further, in step 2), the temperature of the ultrasonic-enhanced leaching is 55 - 95 °C.

[0013] Further, in step 2), the time of the ultrasonic-enhanced leaching is 30 - 150 min.

[0014] Further, in step 2), the stirring speed of the ultrasonic-enhanced leaching is 100 - 300 r / min.

[0015] Further, in step 2), the ultrasonic power of the ultrasonic-enhanced leaching is 0 - 2500 W / L.

[0016] Further, before adding the zinc leaching residue to the reactor, the zinc leaching residue needs to be pretreated, which specifically includes the following steps:

[0017] Place the zinc leaching residue in a blast drying oven, dry it at 60 °C for 12 h, and pass through a 180-mesh sieve.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The method for ultrasonic-enhanced oxidation leaching of zinc leaching residue with manganese dioxide provided by the present invention uses ultrasound and manganese dioxide to synergistically leach the zinc leaching residue, shortening the leaching time while increasing the leaching rate, and effectively improving the production efficiency;

[0020] A method for ultrasonic-enhanced manganese dioxide oxidation leaching of zinc leaching residue provided by the present invention reacts insoluble sulfides by adding manganese dioxide under the action of ultrasonic waves and sulfuric acid, so that insoluble zinc sulfide is converted into soluble zinc sulfate; compared with oxidants such as ozone and hydrogen peroxide, manganese dioxide is a relatively cheap oxidant, suitable for large-scale industrial applications, while the production costs of oxidants such as ozone and hydrogen peroxide are relatively high, and special equipment is required for preparation and storage. In addition, manganese dioxide mainly generates Mn 2+ during the oxidation process, which has less impact on the environment, while oxidants such as ozone and hydrogen peroxide may generate harmful free radicals or other by-products during decomposition;

[0021] A method for ultrasonic-enhanced manganese dioxide oxidation leaching of zinc leaching residue provided by the present invention uses ultrasonic leaching of zinc leaching residue. The cavitation effect generated by ultrasonic waves will generate a large number of microbubbles inside the liquid. These bubbles will experience processes such as formation, oscillation, growth, contraction, and explosion. When the bubbles rapidly contract, a huge amount of energy will be generated inside the liquid, causing the temperature and pressure around the bubbles to rise at an instantaneous extreme speed, thus generating an instantaneous high-temperature and high-pressure reaction environment; in addition, the shock waves and microjets generated during this process are combined with mechanical action to strongly oscillate the solid-liquid phase in the solution, not only continuously eroding the boundary layer to generate new reaction interfaces, but also reducing the liquid viscosity and mass transfer resistance; and the added manganese dioxide continuously reacts with substances such as sulfides at the new interface, exposing the encapsulated zinc compounds to the acid system, thereby shortening the leaching time while increasing the leaching rate;

[0022] The specific reactions during the leaching process of a method for ultrasonic-enhanced manganese dioxide oxidation leaching of zinc leaching residue provided by the present invention are as follows:

[0023] ZnO + 2H + = Zn 2+ + H 2 O

[0024] ZnS + MnO 2 + 2H + = Zn 2+ + Mn 2+ + 2H 2 O + S

[0025] Fe 2 O 3 + 6H + = 2Fe 3+ + 3H 2 O

[0026] 2Fe 2+ + MnO 2 + 4H + = 2Fe 3+ + Mn2+ +2H 2 O BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of showing the preferred embodiments and are not to be considered as limiting the present invention. Also, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0028] Figure 1 is a process flow chart of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] Now, various exemplary embodiments of the present invention will be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and implementation schemes of the present invention. It should be understood that the terms used in the present invention are only for describing specific embodiments and are not used to limit the present invention.

[0030] In addition, for the numerical ranges in the present invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each intermediate value within any stated value or stated range, as well as each smaller range between any other stated value or intermediate value within the stated range, is also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0031] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Although the present invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein can also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0032] Without departing from the scope or spirit of the present invention, various improvements and changes can be made to the specific embodiments of the present invention specification, which are obvious to those skilled in the art. Other embodiments obtained from the specification of the present invention are obvious to those skilled in the art. The specification and examples of the present invention are only exemplary.

[0033] Regarding the use of "comprising", "including", "having", "containing", etc. in this article, they are all open-ended terms, meaning including but not limited to.

[0034] In the following examples and comparative examples, the main chemical components of the zinc leaching residue are shown in Table 1;

[0035] Table 1 Main chemical components of zinc leaching residue

[0036]

[0037] In the following examples and comparative examples, the zinc leaching residue needs to be pretreated, which specifically includes the following steps:

[0038] Place the zinc leaching residue in a forced-air drying oven, dry it at 60 °C for 12 h, and pass it through a 180-mesh sieve.

[0039] In the following examples, a method for ultrasonic-enhanced manganese dioxide oxidative leaching of zinc leaching residue includes the following steps:

[0040] 1) Add the zinc leaching residue, manganese dioxide, and sulfuric acid solution to a reactor to obtain a leaching system;

[0041] Among them, the initial manganese dioxide concentration in the leaching system is 11.11 - 44.44 g / L, the solid-liquid ratio is 1 g∶(4 - 8) mL, and the initial acidity is 60 - 180 g / L;

[0042] 2) Perform ultrasonic-enhanced leaching on the leaching system obtained in step 1);

[0043] Among them, the temperature of ultrasonic-enhanced leaching is 55 - 95 °C, the time is 30 - 150 min, the stirring speed is 100 - 300 r / min, and the ultrasonic power is 0 - 2500 W / L.

[0044] Examples 1 - 4

[0045] A method for ultrasonic-enhanced manganese dioxide oxidative leaching of zinc leaching residue

[0046] 1) Add the zinc leaching residue, manganese dioxide, and sulfuric acid solution to a reactor to obtain a leaching system;

[0047] Among them, the initial manganese dioxide concentrations in the leaching system are 11.11 g / L, 22.22 g / L, 33.33 g / L, and 44.44 g / L respectively, the solid-liquid ratio is 1 g∶6 mL, and the initial acidity is 100 g / L;

[0048] 2) Perform ultrasonic-enhanced leaching on the leaching system obtained in step 1);

[0049] Among them, the temperature of ultrasonic-enhanced leaching is 85 °C, the time is 120 min, the stirring speed is 200 r / min, and the ultrasonic power is 0 W / L.

[0050] Comparative Example 1

[0051] A method for leaching zinc leaching residue

[0052] 1) Add zinc leaching residue and sulfuric acid solution to a reactor to obtain a leaching system;

[0053] Among them, the solid-liquid ratio is 1 g∶6 mL, and the initial acidity is 100 g / L;

[0054] 2) Perform ultrasonic-enhanced leaching on the leaching system obtained in step 1);

[0055] Among them, the temperature of ultrasonic-enhanced leaching is 85 °C, the time is 120 min, the stirring speed is 200 r / minr / min, and the ultrasonic power is 0 W / L.

[0056] After the leaching of Examples 1 to 4 and Comparative Example 1 is completed, perform solid-liquid separation on the leaching system, detect the zinc concentration in the filtrate, and calculate the zinc leaching rate;

[0057] The calculation results of the zinc leaching rates of Examples 1 to 4 and Comparative Example 1 are shown in Table 2;

[0058] Table 2 Zinc leaching rate

[0059]

[0060] It can be seen from the data in Table 2 that for Comparative Example 1 without adding manganese dioxide, the zinc leaching rate is only 80.53%. For Example 1 with an initial manganese dioxide concentration of 11.11 g / L, the zinc leaching rate can reach 85.67%. The reason is that a large number of insoluble compounds in low valence states in the zinc leaching residue are oxidized to soluble salts in high valence states under the action of an oxidant, thereby realizing the leaching of zinc. In addition, when the initial manganese dioxide concentration exceeds 11.11 g / L, the zinc leaching rate tends to be stable. This indicates that when the initial manganese dioxide concentration is 11.11 g / L, the sulfides in the zinc leaching residue that can participate in the reaction have been completely oxidized. Further increasing the initial manganese dioxide concentration not only cannot improve the zinc leaching rate but also increases the manganese ion concentration in the solution. At the same time, excessive manganese dioxide particles will also increase the transfer resistance of the solution, thereby slowing down the reaction. Therefore, the optimal initial manganese dioxide concentration is 11.11 g / L.

[0061] Comparative Example 2

[0062] A method for leaching zinc leaching residue

[0063] Same as Example 1, the only difference is that potassium permanganate is used instead of manganese dioxide.

[0064] Comparative Example 3

[0065] A method for leaching zinc leaching residue

[0066] Same as Example 1, the only difference is that sodium citrate is used instead of manganese dioxide.

[0067] Comparative Example 4

[0068] A method for leaching zinc leaching residue

[0069] Same as Example 1, the difference is only that oxalic acid is used to replace manganese dioxide.

[0070] After the leaching of Comparative Examples 2 to 4 is completed, solid-liquid separation is carried out on the leaching system, the zinc concentration in the filtrate is detected, and the zinc leaching rate is calculated;

[0071] The calculated results of the zinc leaching rates of Comparative Examples 2 to 4 are shown in Table 3;

[0072] Table 3 Zinc leaching rate

[0073]

[0074] It can be seen from the data in Table 3 that compared with potassium permanganate, sodium citrate and oxalic acid, manganese dioxide has the best zinc leaching rate.

[0075] Examples 5 to 8

[0076] A method for ultrasonic-enhanced oxidative leaching of zinc leaching residue with manganese dioxide

[0077] 1) Add zinc leaching residue, manganese dioxide and sulfuric acid solution into a reactor to obtain a leaching system;

[0078] Among them, the initial concentration of manganese dioxide in the leaching system is 11.11 g / L, the solid-liquid ratio is 1 g∶4 mL, 1 g∶5 mL, 1 g∶7 mL, 1 g∶8 mL, and the initial acidity is 100 g / L;

[0079] 2) Perform ultrasonic-enhanced leaching on the leaching system obtained in step 1);

[0080] Among them, the temperature of ultrasonic-enhanced leaching is 85 °C, the time is 120 min, the stirring speed is 200 r / min, and the ultrasonic power is 0 W / L.

[0081] After the leaching of Examples 5 to 8 is completed, solid-liquid separation is carried out on the leaching system, the zinc concentration in the filtrate is detected, and the zinc leaching rate is calculated;

[0082] The calculated results of the zinc leaching rates of Examples 5 to 8 are shown in Table 4;

[0083] Table 4 Zinc leaching rate

[0084]

[0085] As can be seen from the data in Table 4, when the solid-liquid ratio is 1 g∶4 mL, the leaching rate of zinc is only 65.08%. This phenomenon can be attributed to the fact that a lower solid-liquid ratio will lead to an increase in the viscosity of the reaction medium, thereby increasing the mass transfer resistance between the zinc leaching residue, manganese dioxide, and sulfuric acid solution, hindering the progress of the reaction. In addition, a lower solid-liquid ratio will reduce the concentration of active H + in the solution, which is not sufficient to completely react with the substances in the zinc leaching residue. Therefore, only part of the substances are dissolved, resulting in a decrease in the leaching rate. When the solid-liquid ratio increases to 1 g∶7 mL, the leaching rate of zinc increases significantly, reaching 87.11%. When the solid-liquid ratio exceeds 1 g∶7 mL, the metal leaching rate does not increase significantly. This indicates that at a liquid-solid ratio of 1 g∶7 mL, the substances in the acid leaching residue have been completely dissolved by H + , and the change in diffusion resistance is not sufficient to dissolve more soluble substances. Therefore, the optimal liquid-solid ratio is 1 g∶7 mL.

[0086] Examples 9 to 12

[0087] A method for ultrasonic-enhanced oxidative leaching of zinc leaching residue with manganese dioxide

[0088] 1) Add the zinc leaching residue, manganese dioxide, and sulfuric acid solution to a reactor to obtain a leaching system;

[0089] Among them, the initial concentration of manganese dioxide in the leaching system is 11.11 g / L, the solid-liquid ratio is 1 g∶7 mL, and the initial acidities are 60 g / L, 140 g / L, 160 g / L, and 180 g / L respectively;

[0090] 2) Perform ultrasonic-enhanced leaching on the leaching system obtained in step 1);

[0091] Among them, the temperature of ultrasonic-enhanced leaching is 85 °C, the time is 120 min, the stirring speed is 200 r / minr / min, and the ultrasonic power is 0 W / L.

[0092] After the leaching in Examples 9 to 12 is completed, perform solid-liquid separation on the leaching system, detect the zinc concentration in the filtrate, and calculate the leaching rate of zinc;

[0093] The calculation results of the zinc leaching rates in Examples 9 to 12 are shown in Table 5;

[0094] Table 5 Zinc leaching rate

[0095]

[0096] As can be seen from the data in Table 5, when the initial acidity is 60 g / L, the leaching rate of zinc is 81.15%. When the initial acidity increases to 160 g / L, the leaching rate of zinc reaches a peak of 90.27%. This is because when the acidity increases, the H +The concentration increases significantly, and H + The probability of collision with the compound also increases, thus significantly improving the leaching rate. When the initial acidity is further increased to 180 g / L, the leaching rate no longer rises. This is because when the acidity reaches 160 g / L, the metal compounds in the zinc leaching residue in contact with the acid solution have completely reacted. Further increasing the acidity will not leach more zinc ions but will instead lead to an increase in acid consumption. Therefore, the optimal initial acidity is 160 g / L.

[0097] Examples 13 - 16

[0098] A method for ultrasonic - enhanced oxidation leaching of zinc leaching residue with manganese dioxide

[0099] 1) Add the zinc leaching residue, manganese dioxide, and sulfuric acid solution into a reactor to obtain a leaching system;

[0100] Among them, the initial manganese dioxide concentration in the leaching system is 11.11 g / L, the solid - liquid ratio is 1 g∶7 mL, and the initial acidity is 160 g / L;

[0101] 2) Conduct ultrasonic - enhanced leaching on the leaching system obtained in step 1);

[0102] Among them, the temperature of ultrasonic - enhanced leaching is 85 °C, the time is 120 min, the stirring speed is 200 r / min, and the ultrasonic powers are 850 W / L, 1500 W / L, 2000 W / L, and 2500 W / L respectively.

[0103] After the leaching of Examples 13 - 16 is completed, perform solid - liquid separation on the leaching system, detect the zinc concentration in the filtrate, and calculate the zinc leaching rate;

[0104] The calculated results of the zinc leaching rates of Examples 13 - 16 are shown in Table 6;

[0105] Table 6 Zinc leaching rate

[0106]

[0107] As can be seen from the data in Table 6, when the ultrasonic power is 0 W, the leaching rate of zinc is 90.27%. As the ultrasonic power increases, the leaching rate of zinc also increases. When the ultrasonic power increases to 2000 W / L, the leaching rate of zinc reaches the maximum value of 94.56%. This is because the cavitation effect of ultrasound will generate strong shock waves in the liquid medium. These shock waves impact the surface of the inclusions, forming cracks and exposing the internal substances, thereby promoting the dissolution of poorly soluble compounds. In addition, ultrasound will generate rapid and strong mechanical movement in the liquid medium, which can effectively reduce the transfer resistance of zinc leaching residue in the solution, thus promoting the rapid progress of the reaction. However, when the ultrasonic power is increased to 2500 W / L, the recovery rate of zinc shows a downward trend. This is because too high ultrasonic power will enhance the shielding effect of bubbles on sound waves, resulting in significant loss of sound energy when sound waves pass through the bubble-dense area. The reduction of sound energy weakens the effect of ultrasonic treatment. In addition, the increase in the accumulated energy in the bubbles at high power may cause the bubbles to change from linear oscillation to transient cavitation, which in turn affects the cavitation effect. Therefore, the optimal ultrasonic power is 2000 W / L.

[0108] Examples 17 - 20

[0109] A method for ultrasonic enhanced oxidative leaching of zinc leaching residue with manganese dioxide

[0110] 1) Add zinc leaching residue, manganese dioxide and sulfuric acid solution into a reactor to obtain a leaching system;

[0111] Among them, the initial concentration of manganese dioxide in the leaching system is 11.11 g / L, the solid-liquid ratio is 1 g∶7 mL, and the initial acidity is 160 g / L;

[0112] 2) Perform ultrasonic enhanced leaching on the leaching system obtained in step 1);

[0113] Among them, the temperature of ultrasonic enhanced leaching is 85 °C, the time is 120 min, the ultrasonic power is 420 W / L, and the stirring speeds are 100 r / min, 150 r / min, 200 r / min, 250 r / min, and 300 r / min respectively.

[0114] After the leaching of Examples 17 - 20 is completed, perform solid-liquid separation on the leaching system, detect the zinc concentration in the filtrate, and calculate the leaching rate of zinc;

[0115] The calculation results of the zinc leaching rate of Examples 17 - 20 are shown in Table 7;

[0116] Table 7 Zinc leaching rate

[0117]

[0118] As can be seen from the data in Table 7, when the stirring speed is 100 r / min, the leaching rate of zinc is 93.45%. When the stirring speed increases to 250 r / min, the leaching rate of zinc reaches the maximum value of 95.25%. This is because the stirring-assisted ultrasonic cavitation effect enhances the liquid-solid contact and reduces the local concentration gradient, resulting in a slight increase in the leaching rate of zinc. However, when the stirring speed increases to 300 r / min, the recovery rate of zinc shows a downward trend. This is because the synergistic effect of mechanical stirring and ultrasonic waves tends to saturate, and the mass transfer efficiency improvement is limited. In addition, too high a stirring speed may disperse the ultrasonic energy, weaken the cavitation effect, and at the same time intensify the bubble shielding effect, leading to a slight decrease in the leaching rate and an increase in energy consumption. Therefore, the optimal stirring speed is 250 r / min.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or make equivalent replacements. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A method for ultrasonically enhanced manganese dioxide oxidation leaching of zinc leaching residue, characterized in that: The following steps are involved: 1) adding zinc leaching residue, manganese dioxide and sulfuric acid solution into a reactor to obtain a leaching system; 2) performing ultrasonic enhanced leaching on the leaching system obtained in step 1).

2. The method for ultrasonically enhanced manganese dioxide oxidation leaching of zinc leaching residue according to claim 1, characterized in that: In step 1), the initial manganese dioxide concentration of the leaching system is 11.11-44.44 g / L.

3. The method for ultrasonic enhanced manganese dioxide oxidation leaching of zinc leaching residue according to claim 1, characterized in that: In step 1), the solid-liquid ratio of the leaching system is 1 g: (4-8) mL.

4. The method for ultrasonic enhanced manganese dioxide oxidation leaching of zinc leaching residue according to claim 1, characterized in that: In step 1), the initial acidity of the leaching system is 60-180 g / L.

5. The method for ultrasonic enhanced manganese dioxide oxidation leaching of zinc leaching residue according to claim 1, characterized in that: In step 2), the temperature of the ultrasonic enhanced leaching is 55-95°C.

6. The method for ultrasonic enhanced manganese dioxide oxidation leaching of zinc leaching residue according to claim 1, characterized in that: In step 2), the ultrasonic enhanced leaching time is 30 to 150 minutes.

7. The method for ultrasonically enhanced manganese dioxide oxidation leaching of zinc leaching residue according to claim 1, characterized in that: In step 2), the stirring speed of the ultrasonic enhanced leaching is 100 to 300 r / min.

8. The method for ultrasonic enhanced manganese dioxide oxidation leaching of zinc leaching residue according to claim 1, characterized in that: In step 2), the ultrasonic power of the ultrasonic enhanced leaching is 0 to 2500 W / L.

9. The method for ultrasonic enhanced oxidative leaching of zinc leached residues with manganese dioxide according to claim 1, characterized in that: Before adding the zinc leaching residue to the reactor, the zinc leaching residue needs to be pre-treated, which specifically includes the following steps: The zinc leached residue was placed in a forced air drying oven, dried at 60°C for 12 h, and passed through a 180-mesh sieve.

Images