Leaching agent and application thereof in zinc ore leaching

Abstract

The invention discloses a leaching agent and application thereof in zinc ore leaching, and belongs to the technical field of mineral extraction. The leaching agent comprises citrate, dilute sulphuric acid, alkyl sodium sulfonate, a complexing agent, vegetable protein hydrolysate and the like. The method comprises the following steps: performing acidolysis on part of zinc ore by using sulfuric acid to obtain a primary leaching solution and primary leaching residues when the zinc ore is leached; mixing the primary leaching solution with a leaching agent, and leaching the primary leaching residues by using the mixture to obtain a zinc-containing solution and secondary leaching residues; the secondary leaching residues are subjected to leaching with a leaching agent, third-time leaching liquid and third-time leaching residues are obtained, the third-time leaching liquid and the leaching agent are mixed, the third-time leaching residues are subjected to leaching with the mixture, and fourth-time leaching liquid and waste residues are obtained; and then replacing the initial sulfuric acid with the four-time lixivium, and repeating the steps to complete the leaching of the zinc ore. By the adoption of the leaching agent and the leaching process, zinc in the zinc ore can be effectively extracted, and the leaching agent and the leaching process have important significance on efficient utilization of zinc ore resources.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral extraction, and in particular relates to a leaching agent and application thereof in zinc ore leaching. Background Art

[0002] Zinc is an important nonferrous metal with a wide range of applications. There are a large number of zinc oxide ores all over the world, especially in China and Turkey. Nowadays, due to the decreasing sulfide ore resources, these zinc oxide ores have become an important zinc ore resource, and the technology of extracting zinc from zinc oxide is constantly developing. At present, there are two main methods for processing zinc oxide ores: pyrometallurgy and hydrometallurgy. Pyrometallurgy can cause serious environmental pollution. In contrast, hydrometallurgy can better meet environmental requirements, with high metal leaching rate and low cost.

[0003] At present, the acid leaching process for treating zinc oxide ore mainly uses sulfuric acid and nitric acid, which can effectively leach zinc from the ore with a high recovery rate. However, the application of these inorganic acid leaching agents has disadvantages such as poor selectivity, difficulty in leaching solution purification, and easy corrosion of equipment; especially the use of inorganic acids to leach zinc oxide ores containing a large amount of alkaline gangue minerals such as calcium and magnesium, which consumes a large amount of acid and produces a large amount of carbon dioxide gas during the reaction process, which deteriorates the leaching environment and affects the leaching effect. Therefore, the study of new leaching technology for zinc oxide ores is of great significance for the efficient utilization of zinc ore resources. In view of the above reasons, it is very valuable to study organic reagents as leaching agents for zinc extraction. Summary of the invention

[0004] In view of the above-mentioned prior art, the present invention provides a leaching agent and its application in zinc ore leaching to solve the technical problems of low leaching efficiency and large acid consumption in the existing zinc ore leaching method.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is to provide a leaching agent, comprising the following components in parts by weight:

[0006] 5-10 parts of citrate, 20-50 parts of dilute sulfuric acid, 1-3 parts of sodium alkyl sulfonate, 2-5 parts of complexing agent and 2-5 parts of plant protein hydrolyzate.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Further, the leaching agent includes the following components in parts by weight:

[0009] 8 parts of citrate, 30 parts of dilute sulfuric acid, 2 parts of sodium alkyl sulfonate, 4 parts of complexing agent and 3 parts of plant protein hydrolyzate.

[0010] The beneficial effect of the above technical solution adopted by the present invention is that the leaching agent of the present invention contains sulfuric acid solution, sulfuric acid can decompose zinc ore, and sulfuric acid can convert zinc oxide in zinc ore into soluble zinc, thereby improving the leaching rate of zinc. Sodium citrate in the leaching agent is converted into citric acid in a sulfuric acid environment, which can reduce the acidity of the solution, reduce the generation of harmful impurities and avoid corrosion of the leaching equipment; at the same time, citric acid can form a complex with zinc ions, which not only has higher stability, but also helps to improve the water solubility of zinc ions, so that zinc in zinc ore is efficiently leached and stably exists in the leaching solution. The leaching agent in the present invention also contains sodium alkyl sulfonate, which can prevent direct contact and agglomeration between particles, which helps to increase the dispersibility of solid particles in the solution, reduce collision and aggregation between particles, increase the contact area between ore particles and the leaching agent, and promote the leaching of metals such as zinc in zinc ore. The leaching agent of the present invention also includes a chelating agent, which works together with sodium citrate to enhance the chelating effect on metals while ensuring the stability of the leaching agent, thereby improving the leaching rate of zinc. The leaching agent of the present invention also contains plant protein hydrolysate, and the polysaccharides, proteins and other components in the plant protein hydrolysate help to increase the stability of the leaching solution, reduce precipitation and stratification in the solution, thereby improving the stability and efficiency of the leaching process; at the same time, the plant protein hydrolysate is rich in amino acids, peptide compounds, etc., and these components have chelating ability. In the zinc ore leaching process, they can work together with citrate to chelate zinc ions, etc., which helps to dissolve and stabilize zinc ions, thereby improving the leaching efficiency.

[0011] The leaching agent of the present invention can not only reduce the use of acid solution through the mutual cooperation of multiple components, but also promote the leaching of zinc in the mineral, so that the zinc in the zinc ore is stably present in the leaching solution, which is convenient for subsequent separation and purification.

[0012] Furthermore, the citrate is sodium citrate or potassium citrate; the sodium alkyl sulfonate is sodium dodecylbenzene sulfonate; and the complexing agent is disodium EDTA and / or sodium alginate.

[0013] Furthermore, the mass concentration of the dilute sulfuric acid is 40 to 50%.

[0014] Further, the plant protein hydrolysate is prepared by the following steps:

[0015] S1: mixing the vegetable protein powder with water to prepare a slurry with a concentration of 15 to 25 wt%;

[0016] S2: Boil the slurry for 5 minutes, then cool it to 45-60°C, add compound protease, and keep it warm for 24-32 hours to obtain enzymolysis material;

[0017] S3: Boil the enzymatic hydrolyzate for 5 minutes, filter it, collect the filtrate, and then concentrate the filtrate until the volume does not change to obtain an extract;

[0018] S4: spray drying the extract to obtain the product.

[0019] Furthermore, the plant protein powder is soy protein powder or corn protein powder.

[0020] Furthermore, the composite protease is prepared by mixing endoprotease and papain in a mass ratio of 1:1 to 3; the added amount of the composite protease accounts for 2 to 5% of the mass of the slurry.

[0021] The invention also discloses an application of the leaching agent, which is to use the leaching agent in zinc ore leaching.

[0022] Further, zinc ore leaching comprises the following steps:

[0023] (1) Grinding the zinc ore into a powder with a particle size not exceeding 100 μm, then adding the powder into a 50 wt % sulfuric acid solution at a solid-liquid ratio of 1 g:3-5 mL, stirring at room temperature for 30-60 min, and then performing solid-liquid separation to obtain a primary leaching solution and a primary leaching residue;

[0024] (2) mixing the primary leaching solution and the leaching agent in a volume ratio of 10:3-6, and then mixing the primary leaching residue and the mixed solution in a solid-liquid ratio of 1 g:3-5 mL, stirring at 30-40° C. for 30-60 min, and then performing solid-liquid separation to obtain a zinc-containing solution and a secondary leaching residue;

[0025] (3) mixing the secondary leaching residue with the leaching agent at a solid-liquid ratio of 1 g:3-5 mL, stirring at 30-40° C. for 30-60 min, and then performing solid-liquid separation to obtain a tertiary leaching solution and tertiary leaching residue;

[0026] (4) The tertiary leaching solution and the leaching agent are mixed in a volume ratio of 10:3-6, and then the tertiary leaching residue and the mixed solution are mixed in a solid-liquid ratio of 1 g:3-5 mL, stirred at 30-40° C. for 30-60 min, and then solid-liquid separation is performed to obtain a fourth leaching solution and waste residue;

[0027] (5) replacing the sulfuric acid solution in step (1) with the four leaching solutions, and repeating steps (1) to (4) to complete batch leaching of zinc ore.

[0028] The beneficial effects of the present invention adopting the above technical solution are:

[0029] When the zinc ore is leached, the contact area between the ore and the leaching agent is increased by grinding the zinc ore into fine powder, thereby improving the leaching efficiency of zinc. The zinc ore powder is first leached with sulfuric acid. The sulfuric acid solution has strong acidity and can effectively decompose the zinc ore and promote the effective components in the zinc ore to enter the leaching solution; after acid leaching, the separated acid leaching solution is mixed with the leaching agent, and the mixed solution is used to leach the acid leaching residue again. The addition of the leaching agent introduces components such as citrate, sodium alkyl sulfonate, chelating agent and plant protein hydrolyzate into the acid leaching solution, which can make the zinc in the acid leaching solution more stable; the acid leaching solution mixed with the leaching agent can fully disperse the leaching residue, and the acid leaching residue is decomposed again, wherein the unleached zinc and the like become water-soluble chelates and complexes under the action of citric acid, chelating agent and plant protein hydrolyzate, thereby improving the leaching rate of zinc and its suspension stability in the leaching solution. Subsequently, the leaching residue is repeatedly extracted with a leaching agent, which can completely extract the effective components in the zinc ore powder and improve the zinc leaching rate. The new zinc ore powder is extracted with four leaching solutions, which can effectively save the use of leaching agents while ensuring the leaching effect, and can also avoid the corrosion of the leaching equipment caused by high acidity.

[0030] The beneficial effects of the present invention are:

[0031] 1. The leaching agent of the present invention can not only reduce the use of acid solution through the mutual cooperation of multiple components, but also promote the leaching of zinc in the mineral, so that the zinc in the zinc ore is stably present in the leaching solution, which is beneficial to the improvement of the zinc leaching rate in the zinc ore.

[0032] 2. The present invention extracts zinc ore by recycling the leaching agent, which can effectively reduce the amount of leaching agent used while ensuring the leaching rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the process flow chart of zinc ore leaching. DETAILED DESCRIPTION

[0034] The specific implementation modes of the present invention are described in detail below with reference to the embodiments.

[0035] Example 1

[0036] A leaching agent comprising the following components in parts by weight:

[0037] 8 parts of sodium citrate, 30 parts of dilute sulfuric acid with a mass concentration of 45%, 2 parts of sodium dodecylbenzene sulfonate, 4 parts of sodium alginate and 3 parts of plant protein hydrolysate; wherein the plant protein hydrolysate is prepared by the following steps:

[0038] S1: mixing soybean protein powder with water to prepare a slurry with a concentration of 20wt%;

[0039] S2: The slurry is boiled for 5 minutes, then cooled to 50°C, a composite protease is added, and the mixture is kept warm for 28 hours to obtain an enzymolysis material; the composite protease is prepared by mixing endoprotease and papain in a mass ratio of 1:2, and the amount of the composite protease added accounts for 4% of the mass of the slurry;

[0040] S3: Boil the enzymatic hydrolyzate for 5 minutes, filter it, collect the filtrate, and then concentrate the filtrate until the volume does not change to obtain an extract;

[0041] S4: spray drying the extract to obtain the product.

[0042] The leaching agent in this embodiment is prepared by the following steps:

[0043] Disperse the formulated amounts of sodium citrate, sodium dodecylbenzene sulfonate, sodium alginate and plant protein hydrolysate in dilute sulfuric acid and stir at room temperature for 30 minutes to obtain the product.

[0044] Example 2

[0045] A leaching agent comprising the following components in parts by weight:

[0046] 5 parts of potassium citrate, 50 parts of dilute sulfuric acid with a mass concentration of 40%, 1 part of sodium dodecylbenzenesulfonate, 5 parts of disodium EDTA and 2 parts of plant protein hydrolysate; wherein the plant protein hydrolysate is prepared by the following steps:

[0047] S1: mixing corn gluten powder with water to prepare a slurry with a concentration of 15 wt%;

[0048] S2: The slurry is boiled for 5 minutes, then cooled to 45°C, a composite protease is added, and the mixture is kept warm for 32 hours to obtain an enzymolysis material; the composite protease is prepared by mixing endoprotease and papain in a mass ratio of 1:1, and the amount of the composite protease added accounts for 2% of the mass of the slurry;

[0049] S3: Boil the enzymatic hydrolyzate for 5 minutes, filter it, collect the filtrate, and then concentrate the filtrate until the volume does not change to obtain an extract;

[0050] S4: spray drying the extract to obtain the product.

[0051] The leaching agent in this embodiment is prepared by the following steps:

[0052] Disperse the formulated amounts of sodium citrate, sodium dodecylbenzene sulfonate, sodium alginate and plant protein hydrolysate in dilute sulfuric acid and stir at room temperature for 30 minutes to obtain the product.

[0053] Example 3

[0054] A leaching agent comprising the following components in parts by weight:

[0055] 10 parts of sodium citrate, 20 parts of dilute sulfuric acid with a mass concentration of 50%, 3 parts of sodium dodecylbenzene sulfonate, 2 parts of disodium EDTA and 5 parts of plant protein hydrolysate; wherein the plant protein hydrolysate is prepared by the following steps:

[0056] S1: mixing soybean protein powder with water to prepare a slurry with a concentration of 25wt%;

[0057] S2: The slurry is boiled for 5 minutes, then cooled to 60°C, a composite protease is added, and the mixture is kept warm for 24 hours to obtain an enzymolysis material; the composite protease is prepared by mixing endoprotease and papain in a mass ratio of 1:3, and the amount of the composite protease added accounts for 5% of the mass of the slurry;

[0058] S3: Boil the enzymatic hydrolyzate for 5 minutes, filter it, collect the filtrate, and then concentrate the filtrate until the volume does not change to obtain an extract;

[0059] S4: spray drying the extract to obtain the product.

[0060] The leaching agent in this embodiment is prepared by the following steps:

[0061] Disperse the formulated amounts of sodium citrate, sodium dodecylbenzene sulfonate, sodium alginate and plant protein hydrolysate in dilute sulfuric acid and stir at room temperature for 30 minutes to obtain the product.

[0062] Comparative Example 1

[0063] A leaching agent comprising the following components in parts by weight:

[0064] 8 parts of sodium citrate, 30 parts of dilute sulfuric acid with a mass concentration of 45%, 4 parts of sodium alginate and 3 parts of plant protein hydrolysate; wherein the plant protein hydrolysate is prepared by the following steps:

[0065] S1: mixing soybean protein powder with water to prepare a slurry with a concentration of 20wt%;

[0066] S2: The slurry is boiled for 5 minutes, then cooled to 50°C, a composite protease is added, and the mixture is kept warm for 28 hours to obtain an enzymolysis material; the composite protease is prepared by mixing endoprotease and papain in a mass ratio of 1:2, and the amount of the composite protease added accounts for 4% of the mass of the slurry;

[0067] S3: Boil the enzymatic hydrolyzate for 5 minutes, filter it, collect the filtrate, and then concentrate the filtrate until the volume does not change to obtain an extract;

[0068] S4: spray drying the extract to obtain the product.

[0069] The leaching agent in this comparative example is prepared by the following steps:

[0070] Disperse the formulated amount of sodium citrate, sodium alginate and plant protein hydrolysate in dilute sulfuric acid and stir at room temperature for 30 minutes to obtain the product.

[0071] Comparative Example 2

[0072] A leaching agent comprising the following components in parts by weight:

[0073] 8 parts of sodium citrate, 30 parts of dilute sulfuric acid with a mass concentration of 45%, 2 parts of sodium dodecylbenzene sulfonate and 3 parts of plant protein hydrolysate; wherein the plant protein hydrolysate is prepared by the following steps:

[0074] S1: mixing soybean protein powder with water to prepare a slurry with a concentration of 20wt%;

[0075] S2: The slurry is boiled for 5 minutes, then cooled to 50°C, a composite protease is added, and the mixture is kept warm for 28 hours to obtain an enzymolysis material; the composite protease is prepared by mixing endoprotease and papain in a mass ratio of 1:2, and the amount of the composite protease added accounts for 4% of the mass of the slurry;

[0076] S3: Boil the enzymatic hydrolyzate for 5 minutes, filter it, collect the filtrate, and then concentrate the filtrate until the volume does not change to obtain an extract;

[0077] S4: spray drying the extract to obtain the product.

[0078] The leaching agent in this comparative example is prepared by the following steps:

[0079] Disperse the formulated amount of sodium citrate, sodium dodecylbenzene sulfonate and plant protein hydrolysate in dilute sulfuric acid and stir at room temperature for 30 minutes to obtain the product.

[0080] Comparative Example 3

[0081] A leaching agent comprising the following components in parts by weight:

[0082] 8 parts of sodium citrate, 30 parts of dilute sulfuric acid with a mass concentration of 45%, 2 parts of sodium dodecylbenzene sulfonate and 4 parts of sodium alginate.

[0083] The leaching agent in this embodiment is prepared by the following steps:

[0084] Disperse the formulated amount of sodium citrate, sodium dodecylbenzene sulfonate and sodium alginate in dilute sulfuric acid and stir at room temperature for 30 minutes to obtain the product.

[0085] Experimental Example 1

[0086] The zinc ore was leached using the leaching agent in Example 1. The main components of the zinc ore used were as follows:

[0087] ZnO 27.4%, CaO 14.7%, MgO 13.5%, SiO 2 15.3%.

[0088] The specific steps include:

[0089] (1) Grinding the zinc ore to be leached into a powder with a particle size not exceeding 100 μm, then taking 10 wt % of the powder, adding it to a 50 wt % sulfuric acid solution at a solid-liquid ratio of 1 g:4 mL, stirring at room temperature for 45 min, and then performing solid-liquid separation to obtain a primary leaching solution and a primary leaching residue;

[0090] (2) mixing the primary leachate and the leaching agent in a volume ratio of 10:5, and then mixing the primary leaching residue and the mixed solution in a solid-liquid ratio of 1 g:4 mL, stirring at 35° C. for 45 min, and then performing solid-liquid separation to obtain a zinc-containing solution and a secondary leaching residue;

[0091] (3) The secondary leaching residue was mixed with the leaching agent at a solid-liquid ratio of 1 g:4 mL, stirred at 35° C. for 45 min, and then solid-liquid separation was performed to obtain a tertiary leaching solution and a tertiary leaching residue;

[0092] (4) The tertiary leachate and the leaching agent are mixed at a volume ratio of 10:5, and then the tertiary leach residue and the mixed solution are mixed at a solid-liquid ratio of 1 g:4 mL, stirred at 35° C. for 45 min, and then solid-liquid separation is performed to obtain the fourth leachate and waste residue;

[0093] (5) replacing the sulfuric acid solution in step (1) with the fourth leaching solution, and repeating steps (1) to (4) until all the zinc ore powder is completely leached.

[0094] Experimental Example 2

[0095] The zinc ore was leached using the leaching agent in Example 2. The zinc ore used was the same batch as that in Experimental Example 1. The extraction process was the same as that in Experimental Example 1.

[0096] Experimental Example 3

[0097] The zinc ore was leached using the leaching agent in Example 3. The zinc ore used was the same batch as that in Experimental Example 1. The extraction process was the same as that in Experimental Example 1.

[0098] Experimental Example 4

[0099] The zinc ore was leached using the leaching agent in Comparative Example 1, and the zinc ore used was the same batch as that in Experimental Example 1; the extraction process was the same as that in Experimental Example 1.

[0100] Experimental Example 5

[0101] The zinc ore was leached using the leaching agent in Comparative Example 2, and the zinc ore used was the same batch as that in Experimental Example 1; the extraction process was the same as that in Experimental Example 1.

[0102] Experimental Example 6

[0103] The zinc ore was leached using the leaching agent in Comparative Example 3, and the zinc ore used was the same batch as that in Experimental Example 1; the extraction process was the same as that in Experimental Example 1.

[0104] The leaching rate of zinc in the zinc ore in the above-mentioned experimental examples was calculated using the conventional leaching rate calculation method in the field of metal mineral leaching. The results are shown in Table 1.

[0105] Table 1 Leaching rate of zinc ore leaching

[0106] Leaching rate (%) Experimental Example 1 97.54 Experimental Example 2 96.89 Experimental Example 3 97.21 Experimental Example 4 87.31 Experimental Example 5 89.28 Experimental Example 6 86.33

[0107] It can be seen from Table 1 that when the leaching agents in Examples 1 to 3 are used to leach zinc ore, the leaching rate of zinc is above 96.8%, indicating that the leaching agent and leaching process of the present invention can effectively extract zinc from zinc ore, which is of great significance for the efficient utilization of zinc ore resources.

[0108] Experimental Example 4 uses the leaching agent in Comparative Example 1 to leach the zinc ore. Compared with the leaching agent in Example 1, the leaching agent used lacks sodium dodecylbenzene sulfonate, and the powder is prone to agglomeration in the leaching system, which is not conducive to the leaching of zinc, resulting in a low leaching rate.

[0109] Experimental Example 5 uses the leaching agent in Comparative Example 2 to leach the zinc ore. Compared with the leaching agent in Example 1, the leaching agent used lacks a chelating agent (sodium alginate) and cannot chelate zinc from the zinc ore. The leached zinc cannot exist stably in the leaching solution, resulting in a low leaching rate.

[0110] Experimental Example 6 uses the leaching agent in Comparative Example 3 to leach the zinc ore. Compared with the leaching agent in Example 1, the leaching agent used lacks plant protein hydrolysate, the extract is prone to precipitation and stratification, and cannot effectively convert zinc into water-soluble zinc, resulting in a low leaching rate.

[0111] Although the specific implementation of the present invention is described in detail in conjunction with the embodiments, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A leaching agent, characterized in that The composition comprises the following components in parts by weight: 5-10 parts of citrate, 20-50 parts of dilute sulfuric acid, 1-3 parts of sodium alkyl sulfonate, 2-5 parts of complexing agent and 2-5 parts of plant protein hydrolyzate.

2. The leaching agent according to claim 1, characterized in that The composition comprises the following components in parts by weight: 8 parts of citrate, 30 parts of dilute sulfuric acid, 2 parts of sodium alkyl sulfonate, 4 parts of complexing agent and 3 parts of plant protein hydrolyzate.

3. The leaching agent according to claim 1 or 2, characterized in that: The citrate is sodium citrate or potassium citrate; the sodium alkyl sulfonate is sodium dodecylbenzene sulfonate; and the complexing agent is disodium EDTA and / or sodium alginate.

4. The leaching agent according to claim 1 or 2, characterized in that: The mass concentration of the dilute sulfuric acid is 40-50%.

5. The leaching agent according to claim 1 or 2, characterized in that The plant protein hydrolysate is prepared by the following steps: S1: mixing the vegetable protein powder with water to prepare a slurry with a concentration of 15 to 25 wt%; S2: Boil the slurry for 5 minutes, then cool it to 45-60°C, add compound protease, and keep it warm for 24-32 hours to obtain enzymolysis material; S3: Boil the enzymatic hydrolyzate for 5 minutes, filter it, collect the filtrate, and then concentrate the filtrate until the volume does not change to obtain an extract; S4: spray drying the extract to obtain the product.

6. The leaching agent according to claim 5, characterized in that: The plant protein powder is soybean protein powder or corn protein powder.

7. The leaching agent according to claim 5, characterized in that: The composite protease is prepared by mixing endoprotease and papain in a mass ratio of 1:1-3; the added amount of the composite protease accounts for 2-5% of the mass of the slurry.

8. Use of the leaching agent according to any one of claims 1 to 7, characterized in that: The lixiviant is used in zinc ore leaching.

9. The use according to claim 8, characterized in that: The zinc ore leaching comprises the following steps: (1) Grinding the zinc ore into a powder with a particle size not exceeding 100 μm, then adding the powder into a 50 wt % sulfuric acid solution at a solid-liquid ratio of 1 g:3-5 mL, stirring at room temperature for 30-60 min, and then performing solid-liquid separation to obtain a primary leaching solution and a primary leaching residue; (2) mixing the primary leaching solution and the leaching agent in a volume ratio of 10:3-6, and then mixing the primary leaching residue and the mixed solution in a solid-liquid ratio of 1 g:3-5 mL, stirring at 30-40° C. for 30-60 min, and then performing solid-liquid separation to obtain a zinc-containing solution and a secondary leaching residue; (3) mixing the secondary leaching residue with the leaching agent at a solid-liquid ratio of 1 g:3-5 mL, stirring at 30-40° C. for 30-60 min, and then performing solid-liquid separation to obtain a tertiary leaching solution and tertiary leaching residue; (4) The tertiary leaching solution and the leaching agent are mixed in a volume ratio of 10:3-6, and then the tertiary leaching residue and the mixed solution are mixed in a solid-liquid ratio of 1 g:3-5 mL, stirred at 30-40° C. for 30-60 min, and then solid-liquid separation is performed to obtain a fourth leaching solution and waste residue; (5) replacing the sulfuric acid solution in step (1) with the four leaching solutions, and repeating steps (1) to (4) to complete batch leaching of zinc ore.

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