Beneficiation method for recovering metazeenite from lead-zinc sulfide ore tailings

Abstract

The application provides a beneficiation method for recovering heteropolar ore from lead-zinc sulfide tailings. The method comprises the following steps: mixing the lead-zinc sulfide tailings with water to prepare a first slurry; grading the first slurry to obtain a sand product and an overflow product; adding water to the sand product to prepare a second slurry; adding a predetermined amount of an inhibitor, sodium sulfide and a collector into the second slurry to perform rough flotation of the heteropolar ore, and obtaining a rough flotation froth product and a rough flotation tank bottom product; performing three times of cleaning on the rough flotation froth product to obtain a concentrate product; performing one time of scavenging on the rough flotation tank bottom product to obtain a scavenging froth and a scavenging underflow; and combining the scavenging underflow with the overflow product to obtain a final tailings. Through the above method, the adverse effects of the slime can be reduced under the condition of reducing the loss of the heteropolar ore as much as possible, and the flotation reagent system of the sand product is optimized on this basis, so that the heteropolar ore can be effectively recovered simply and efficiently, and the resource utilization rate is improved.

Description

Technical Field

[0001] This invention relates to the field of heterodyne recovery technology, and in particular to a beneficiation method for recovering heterodyne from tailings of lead-zinc sulfide ore. Background Technology

[0002] Hemimorphite is a product of the long-term weathering of zinc sulfide minerals during geological structural changes in nature. Hemimorphite ore typically exhibits characteristics such as a variety of minerals, complex ore structure, high degree of oxidation, high mud content, fine-grained disseminated particles, and high calcium-magnesium gangue content. Due to its ineffective utilization, it represents a significant waste of resources. Currently used zinc oxide recovery methods include anionic direct flotation, sulfide aliphatic amine flotation, and chelating agent-neutral oil flotation. These flotation methods usually only recover smithsonite. However, hemimorphite, due to significant differences in surface properties compared to smithsonite and its poor floatability, is difficult to recover using conventional methods and is considered an extremely difficult mineral to recover. Therefore, the effective recovery of hemimorphite has remained largely unresolved.

[0003] In the prior art, patent CN102489412A discloses an activation method for the flotation process of heterodyne ore. This patent uses a combination of sodium hydroxamate, sodium carbonate, and sodium sulfide as an activator for heterodyne ore, and then uses dodecylamine as a collector for flotation. This method can reduce the total amount of sodium sulfide used by 20-30% compared to conventional activation processes, and increase the flotation recovery rate of heterodyne ore by 6-12 percentage points. However, this method is for pure heterodyne ore, where the content of heterodyne ore in the feed is 100%, without interference from other impurity minerals. Furthermore, pure minerals are generally well-crystallized, have good floatability, and are easy to float. This method is difficult to apply to actual ore systems with a wide variety of minerals, high impurity mineral content, and complex and variable characteristics. For example, when beneficiating and recovering heterodyne ore from lead-zinc sulfide tailings, because the content of useful minerals in the raw material is low, with the heterodyne content being only 2.0%-3.0%, the above method cannot achieve good beneficiation indicators.

[0004] In view of this, it is necessary to design a simple and efficient mineral processing technology to recover heterodyne from lead-zinc sulfide tailings at low cost and in a high efficiency, so as to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the present invention aims to provide a beneficiation method for recovering heterodyne ore from tailings of lead-zinc sulfide ore. The present invention employs a hydrocyclone desliming-flotation process, first classifying the raw material using a hydrocyclone, then flotating the classified sediment, and optimizing the reagent regime during the flotation process to achieve simple and efficient recovery of heterodyne ore.

[0006] To achieve the above objectives, the present invention provides a mineral processing method for recovering heterodyne from lead-zinc sulfide tailings, comprising the following steps:

[0007] S1. Mix lead-zinc sulfide tailings with water to prepare a first slurry of a predetermined concentration;

[0008] S2. The first slurry is classified to obtain sediment products and overflow products;

[0009] S3. Add water to the sedimentation product to prepare a second slurry of a predetermined concentration;

[0010] S4. Prepare inhibitors and collectors according to predetermined ratios; add predetermined amounts of the inhibitor, sodium sulfide and collector to the second slurry, and perform roughing flotation of the heterodyne to obtain roughing froth product and roughing tank bottom product.

[0011] S5. The roughing froth product is subjected to three fine-tuning processes to obtain a concentrate product; the bottom product of the roughing tank is subjected to one scavenging process to obtain scavenging froth and scavenging underflow. The scavenging underflow and the overflow product are combined to obtain the final tailings.

[0012] As a further improvement of the present invention, in step S2, a hydrocyclone is used to classify the first slurry to remove particles with a diameter of less than 10 μm; the yield of the overflow product obtained after classification by the hydrocyclone is 10% to 12%.

[0013] As a further improvement of the present invention, in step S4, the method for preparing the inhibitor includes:

[0014] Sodium hexametaphosphate, citric acid monohydrate, tartaric acid, and oxalic acid are mixed evenly in a mass percentage ratio of 10%–20%: 20%–30%: 20%–30%: 20%–30%.

[0015] As a further improvement of the present invention, in step S4, the method for preparing the collector includes:

[0016] Mix cocoamine, lauryl trimethylammonium chloride, oleic acid diethanolamide, and isooctyl alcohol in a mass percentage ratio of 30%–40%: 20%–30%: 10%–20%: 10%–20%.

[0017] As a further improvement of the present invention, in step S4, the amount of inhibitor is 1000-2000 g / t, the amount of sodium sulfide is 4000-5000 g / t, and the amount of collector is 300-400 g / t.

[0018] As a further improvement of the present invention, in step S5, the three selections include the following steps:

[0019] Adding 280–320 g / t of sodium sulfide to the roughing froth product for a first cleaning process yields Cleaning 1 froth and Cleaning 1 underflow. Adding 180–220 g / t of sodium sulfide to the Cleaning 1 froth for a second cleaning process yields Cleaning 2 froth and Cleaning 2 underflow. Adding 90–110 g / t of sodium sulfide to the Cleaning 2 froth for a third cleaning process yields Cleaning 3 froth and Cleaning 3 underflow. The Cleaning 3 froth is the concentrate product.

[0020] As a further improvement of the present invention, the first selected bottom stream returns to the graded operation in step S2, the second selected bottom stream returns to the first selected operation, and the third selected bottom stream returns to the second selected operation.

[0021] As a further improvement of the present invention, in step S5, the scavenging reagent includes 480-520 g / t of sodium sulfide and 45-55 g / t of the collector; the scavenging foam is returned to the flotation roughing operation in step S4.

[0022] As a further improvement of the present invention, in step S1, the predetermined concentration of the first slurry is 30wt% to 35wt%.

[0023] As a further improvement of the present invention, in step S3, the predetermined concentration of the second slurry is 20wt% to 25wt%.

[0024] The beneficial effects of this invention are:

[0025] 1. The beneficiation method for recovering heterodyne from lead-zinc sulfide ore tailings provided by this invention employs a hydrocyclone desliming-flotation process. First, the raw material is classified using a hydrocyclone, which not only removes fine-grained slime and reduces its adverse effects, but also controls the yield of the overflow product from the hydrocyclone classification to 10%–12%, minimizing the loss of heterodyne in the overflow product and thus improving the recovery rate. After classification, the resulting sediment is floated, and the reagent regime in the flotation process is optimized. This simple process efficiently recovers heterodyne from lead-zinc sulfide ore tailings, achieving better performance indicators and improving resource utilization.

[0026] 2. The beneficiation method for recovering hemimorphite from lead-zinc sulfide tailings provided by this invention, by mixing sodium hexametaphosphate, citric acid monohydrate, tartaric acid, and oxalic acid in a specific ratio to form an inhibitor, can produce a targeted inhibitory effect on calcium-containing gangue and silica-containing gangue, thereby improving the concentrate grade. Under this condition, this invention further mixes cocoamine, lauryltrimethylammonium chloride, oleic acid diethanolamide, and isooctyl alcohol in a specific ratio to form a collector, which can disperse the agent in the slurry and fully interact with the mineral surface. Compared with traditional collectors, this method effectively enhances the collection of hemimorphite and improves the recovery rate of hemimorphite. Attached Figure Description

[0027] Figure 1 This is a schematic flowchart of the beneficiation method for recovering heterodyne from tailings of lead-zinc sulfide ore provided by the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0030] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] This invention provides a mineral processing method for recovering heterodyne from lead-zinc sulfide tailings, the process flow diagram of which is shown below. Figure 1 As shown, it includes the following steps:

[0032] S1. Mix lead-zinc sulfide tailings with water to prepare a first slurry of a predetermined concentration;

[0033] S2. The first slurry is classified to obtain sediment products and overflow products;

[0034] S3. Add water to the sedimentation product to prepare a second slurry of a predetermined concentration;

[0035] S4. Prepare inhibitors and collectors according to predetermined ratios; add predetermined amounts of the inhibitor, sodium sulfide and collector to the second slurry, and perform roughing flotation of the heterodyne to obtain roughing froth product and roughing tank bottom product.

[0036] S5. The roughing froth product is subjected to three fine-tuning processes to obtain a concentrate product; the bottom product of the roughing tank is subjected to one scavenging process to obtain scavenging froth and scavenging underflow. The scavenging underflow and the overflow product are combined to obtain the final tailings.

[0037] By using the above method, the fine-grained slime in the raw material can be removed first through grading to reduce the adverse effects of slime. On this basis, targeted flotation can be carried out, which can effectively improve flotation efficiency and flotation effect.

[0038] Specifically, in step S1, the predetermined concentration of the first slurry is preferably 30wt% to 35wt%.

[0039] In step S2, a hydrocyclone is used to classify the first slurry, allowing particles larger than 10 μm to enter the underflow product, while particles smaller than 10 μm enter the overflow product to remove particles smaller than 10 μm. Under these conditions, the yield of the overflow product obtained after hydrocyclone classification can be controlled within the range of 10% to 12%. This setup not only effectively removes fine-grained sludge from the raw material to eliminate its adverse effects, but also keeps the yield of the overflow product within a low range. Very little anisocyanate is lost in the overflow after classification, effectively avoiding the problem of significant zinc loss caused by conventional large-scale or multi-stage desliming methods.

[0040] In step S3, the predetermined concentration of the second slurry is 20wt% to 25wt%.

[0041] In step S4, the method for preparing the inhibitor includes:

[0042] Sodium hexametaphosphate, citric acid monohydrate, tartaric acid, and oxalic acid are mixed evenly in a mass percentage ratio of 10%–20%: 20%–30%: 20%–30%: 20%–30%.

[0043] Based on the composition of this inhibitor, each component is slightly acidic and will not react after mixing, exhibiting high stability. By mixing the above components in proportion, it can effectively inhibit calcium-containing gangue as well as silica-containing gangue such as quartz, pyroxene, and chlorite activated by magnesium ions, thereby effectively improving the grade of the concentrate.

[0044] The method for preparing the collector includes:

[0045] Mix cocoamine, lauryl trimethylammonium chloride, oleic acid diethanolamide, and isooctyl alcohol in a mass percentage ratio of 30%–40%: 20%–30%: 10%–20%: 10%–20%.

[0046] Based on the composition of this collector, on the one hand, isooctyl alcohol can be used to fully disperse cocoamine, lauryltrimethylammonium chloride, and oleic acid diethanolamide in the slurry, allowing them to fully interact with the mineral surface and achieve a better collection effect. On the other hand, cocoamine in this collector is mainly used to collect smithsonite, and oleic acid diethanolamide can effectively activate hemimorphite. On this basis, lauryltrimethylammonium chloride is used to collect hemimorphite. Compared with traditional collectors, this can effectively enhance the collection of hemimorphite, thereby improving the recovery rate of hemimorphite.

[0047] Based on the above reagent composition, the preferred dosage of inhibitor during rough selection is 1000-2000 g / t, sodium sulfide is 4000-5000 g / t, and collector is 300-400 g / t.

[0048] In step S5, the three selections include the following steps:

[0049] Adding 280–320 g / t of sodium sulfide to the roughing froth product for a first cleaning process yields Cleaning 1 froth and Cleaning 1 underflow. Adding 180–220 g / t of sodium sulfide to the Cleaning 1 froth for a second cleaning process yields Cleaning 2 froth and Cleaning 2 underflow. Adding 90–110 g / t of sodium sulfide to the Cleaning 2 froth for a third cleaning process yields Cleaning 3 froth and Cleaning 3 underflow. The Cleaning 3 froth is the concentrate product.

[0050] Specifically, the first selected bottom stream returns to the graded operation in step S2, the second selected bottom stream returns to the first selected operation, and the third selected bottom stream returns to the second selected operation.

[0051] The scavenging reagents include 480-520 g / t of sodium sulfide and 45-55 g / t of the collector; the scavenging foam is returned to the flotation roughing operation in step S4.

[0052] The following describes the beneficiation method for recovering heterodyne from lead-zinc sulfide tailings provided by the present invention with reference to specific embodiments.

[0053] Example 1

[0054] This embodiment uses tailings from a lead-zinc sulfide mine as an example and provides a beneficiation method for recovering hemimorphite from the tailings. The tailings, by mass percentage, contain 2.75% hemimorphite, 1.27% smithsonite, 32.42% dolomite, 13.85% calcite, 21.72% quartz, and 8.46% chlorite. Other minerals include small amounts of gangue minerals such as feldspar, clay minerals, biotite, muscovite, pyroxene, and serpentine, and trace amounts of metallic minerals such as pyrite, hematite, and limonite.

[0055] The mineral processing method for recovering heterodyne from lead-zinc sulfide tailings provided in this embodiment includes the following steps:

[0056] S1. Mix lead-zinc sulfide tailings with water to prepare a first slurry with a slurry concentration of 32wt%.

[0057] S2. The first slurry is classified using a hydrocyclone to obtain a sediment product and an overflow product. Particles with a diameter of less than 10 μm enter the overflow and are removed. The yield of the overflow product after classification is approximately 11%.

[0058] S3. Add water to the sand product to prepare a second slurry with a slurry concentration of 22wt%.

[0059] S4. Sodium hexametaphosphate, citric acid monohydrate, tartaric acid, and oxalic acid are mixed evenly in a mass percentage ratio of 10%:30%:30%:30% to prepare an inhibitor; cocoamine, lauryl trimethylammonium chloride, oleic acid diethanolamide, and isooctyl alcohol are mixed evenly in a mass percentage ratio of 30%:30%:20%:20% to prepare a collector; 1000 g / t of inhibitor, 4000 g / t of sodium sulfide, and 300 g / t of collector are added to the second slurry for roughing flotation of the heterodyne to obtain a roughing froth product and a roughing tank bottom product;

[0060] S5. Add 300 g / t of sodium sulfide to the roughing froth product for the first cleaning (Clean I), obtaining Clean I froth and Clean I underflow; add 200 g / t of sodium sulfide to Clean I froth for the second cleaning (Clean II), obtaining Clean II froth and Clean II underflow; add 100 g / t of sodium sulfide to Clean II froth for the third cleaning (Clean III), obtaining Clean III froth and Clean III underflow; Clean III froth is the final concentrate product. Clean I underflow is returned to the hydrocyclone classification operation in step S2, Clean II underflow is returned to the first cleaning operation, and Clean III underflow is returned to the second cleaning operation. The roughing tank bottom product undergoes one scavenging process to obtain scavenging froth and underflow. The scavenging reagents are 500 g / t of sodium sulfide and 50 g / t of collector. The scavenging froth is returned to the flotation roughing operation in step S4; the scavenging underflow is combined with the overflow product obtained in step S2 to obtain the final tailings.

[0061] After flotation as described above, the final concentrate product obtained in this embodiment contains 32.48% Zn, with a Zn recovery rate of 70.70% and a hemimorphite recovery rate of 72.05%. This indicates that the method provided in this embodiment can effectively recover hemimorphite from lead-zinc sulfide tailings, and not only has a high recovery rate, but the recovered concentrate also has a high grade.

[0062] Examples 2-4

[0063] Examples 2-4 provide a beneficiation method for recovering heterodyne from lead-zinc sulfide tailings. Compared with Example 1, the only difference is that the dosage of inhibitor, sodium sulfide and collector in step S4 is changed. The other steps and parameters are the same as in Example 1, and will not be repeated here.

[0064] Specifically, in Example 2, the amount of inhibitor used was 2000 g / t, and the final concentrate product contained 34.13% Zn, with a Zn recovery rate of 68.91% and a hemimorphite recovery rate of 69.25%.

[0065] In Example 3, the amount of sodium sulfide used was 5000 g / t, and the final concentrate product contained 33.93% Zn, with a Zn recovery rate of 70.02% and a hemimorphite recovery rate of 70.68%.

[0066] In Example 4, the amount of collector used was 400 g / t, and the final concentrate product contained 30.12% Zn, with a Zn recovery rate of 71.43% and a hemimorphite recovery rate of 71.97%.

[0067] Compared with Example 1, it can be seen that the dosage of inhibitor, sodium sulfide and collector can be appropriately adjusted within a specific range, and all of them can achieve effective recovery of heterodyne from lead-zinc sulfide tailings.

[0068] Comparative Example 1

[0069] This comparative example provides a beneficiation method for recovering heterodyne from tailings of lead-zinc sulfide ore. Compared with Example 1, the difference is that the hydrocyclone classification treatment in step S2 is not performed. The remaining steps are the same as in Example 1 and will not be repeated here.

[0070] Testing revealed that the concentrate obtained in this comparative example contained 27.82% Zn, with a Zn recovery rate of 40.83% and a hemimorphite recovery rate of 41.01%. Compared to Example 1, the concentrate grade was lower, and both the Zn recovery rate and the hemimorphite recovery rate were significantly reduced. This indicates that the method of classifying the raw materials using a hydrocyclone in Example 1 can easily and efficiently improve the hemimorphite recovery rate and concentrate grade.

[0071] Examples 5-7 and Comparative Examples 2-4

[0072] Examples 5-7 and Comparative Examples 2-4 respectively provide a beneficiation method for recovering heterodyne from tailings of lead-zinc sulfide ore. Compared with Example 1, the difference between Examples 5-7 and Comparative Examples 2-3 is that the composition of the inhibitor is changed, while Comparative Example 4 does not add an inhibitor. The remaining steps and parameters are the same as in Example 1, and will not be repeated here. The mass percentage of each component in the inhibitors provided in Examples 5-7 and Comparative Examples 2-3 is shown in Table 1.

[0073] Table 1. Mass percentage of each component in the inhibitors in Examples 5-7 and Comparative Examples 2-3.

[0074]

[0075] The mineral processing results of the mineral processing methods provided in Examples 5-7 and Comparative Examples 2-4 were tested and calculated, and the results are shown in Table 2.

[0076] Table 2 shows the mineral processing results of Examples 5-7 and Comparative Examples 2-4.

[0077]

[0078] As shown in Table 2, in Examples 5-7, the proportions of the inhibitor components, when appropriately adjusted and varied within a preset range, all achieved effective recovery of heteromorphite from lead-zinc sulfide tailings, indicating that the proportions of the inhibitor components can be appropriately adjusted within a specific range. In Comparative Example 4, no inhibitor was added, and the Zn content, Zn recovery rate, and heteromorphite recovery rate in the resulting concentrate were significantly lower than in Example 1, indicating that the inhibitor used in Example 1 could effectively inhibit the growth of heteromorphite. In Comparative Examples 2-3, although inhibitors were added, the proportions of some components exceeded the preset range. Compared with Example 1, the Zn recovery rate and heteromorphite recovery rate in the concentrate were both reduced, indicating that the present invention, by controlling the proportions of each component in the inhibitor within a certain range, can effectively leverage the synergistic effect of the components in the inhibitor, achieving effective recovery of heteromorphite from lead-zinc sulfide tailings.

[0079] Examples 8-10 and Comparative Examples 5-7

[0080] Examples 8-10 and Comparative Examples 5-7 respectively provide a beneficiation method for recovering heterodyne from tailings of lead-zinc sulfide ore. Compared with Example 1, the difference between Examples 8-10 and Comparative Examples 5-6 is that the composition of the collector is changed. In Comparative Example 7, the collector is replaced with the traditional collector octadecylamine. The remaining steps and parameters are the same as in Example 1, and will not be repeated here. The mass percentage of each component in the collectors provided in Examples 8-10 and Comparative Examples 5-6 is shown in Table 3.

[0081] Table 3. Mass percentage of each component in the collectors of Examples 8-10 and Comparative Examples 5-6

[0082]

[0083] The mineral processing results of the mineral processing methods provided in Examples 8-10 and Comparative Examples 5-7 were tested and calculated, and the results are shown in Table 4.

[0084] Table 4 shows the mineral processing results of Examples 8-10 and Comparative Examples 5-7.

[0085]

[0086] As shown in Table 4, in Examples 8-9, the proportions of each component of the collector, when appropriately adjusted and varied within a preset range, could effectively recover hemimorphite from lead-zinc sulfide tailings, indicating that the proportions of each component of the collector can be appropriately adjusted within a specific range. In Comparative Example 7, octadecylamine was used as the collector, and the Zn content, Zn recovery rate, and hemimorphite recovery rate in the resulting concentrate were significantly lower than in Example 1, indicating that the collector used in Example 1 effectively enhanced the recovery of hemimorphite compared to traditional collectors, improving concentrate grade and recovery rate. In Comparative Examples 5-6, the collectors used the same raw materials as in Example 1, but their dosages differed. The Zn content in the final concentrate was lower than in Example 1 but higher than in Comparative Example 7, while the Zn and hemimorphite recovery rates were even lower than in Comparative Example 7, indicating that the proportions of raw materials in the collector have a significant impact on the collection effect. This invention effectively enhances the collecting effect of the collector by controlling the amount of each raw material in the collector within a specific range, thereby achieving effective recovery of heterodyne ore from lead-zinc sulfide tailings.

[0087] In summary, this invention provides a beneficiation method for recovering heterodyne from tailings of lead-zinc sulfide ore. The method includes mixing lead-zinc sulfide ore tailings with water to prepare a first slurry; classifying the first slurry to obtain a grit product and an overflow product; adding water to the grit product to prepare a second slurry; adding predetermined amounts of inhibitor, sodium sulfide, and collector to the second slurry for roughing flotation of the heterodyne to obtain a roughing froth product and a roughing bottom product; performing three cleaning processes on the roughing froth product to obtain a concentrate product; and performing a scavenging process on the roughing bottom product to obtain scavenging froth and scavenging underflow, which is then combined with the overflow product to obtain the final tailings. Through this method, this invention can reduce the adverse effects of slime while minimizing heterodyne loss, and further optimize the flotation reagent system for the grit product, thereby achieving simple and efficient recovery of heterodyne and improving resource utilization.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A mineral processing method for recovering heterodyne from tailings of lead-zinc sulfide ore, characterized in that, Includes the following steps: S1. Mix lead-zinc sulfide tailings with water to prepare a first slurry of a predetermined concentration; S2. The first slurry is classified to obtain sediment products and overflow products; The first slurry is classified using a hydrocyclone to remove particles with a diameter of less than 10 μm; the yield of the overflow product obtained after classification by the hydrocyclone is 10%~12%. S3. Add water to the sedimentation product to prepare a second slurry of a predetermined concentration; S4. Prepare inhibitors and collectors according to predetermined ratios; add predetermined amounts of the inhibitor, sodium sulfide and collector to the second slurry, and perform roughing flotation of the heterodyne to obtain roughing froth product and roughing tank bottom product. The method for preparing the inhibitor includes: Sodium hexametaphosphate, citric acid monohydrate, tartaric acid, and oxalic acid are mixed evenly in a mass percentage ratio of 10%~20%: 20%~30%: 20%~30%: 20%~30%; The method for preparing the collector includes: Mix cocoamine, lauryl trimethylammonium chloride, oleic acid diethanolamide, and isooctyl alcohol in a mass percentage ratio of 30%~40%: 20%~30%: 10%~20%: 10%~20%; S5. The roughing froth product is subjected to three fine-tuning processes to obtain a concentrate product; the bottom product of the roughing tank is subjected to one scavenging process to obtain scavenging froth and scavenging underflow. The scavenging underflow and the overflow product are combined to obtain the final tailings.

2. The beneficiation method for recovering heterodyne from lead-zinc sulfide tailings according to claim 1, characterized in that: In step S4, the amount of inhibitor used is 1000~2000 g / t, the amount of sodium sulfide used is 4000~5000 g / t, and the amount of collector used is 300~400 g / t.

3. The beneficiation method for recovering heterodyne from lead-zinc sulfide tailings according to claim 1, characterized in that: In step S5, the three selections include the following steps: Add 280-320 g / t of sodium sulfide to the roughing froth product for the first cleaning process to obtain Cleaning 1 froth and Cleaning 1 underflow; add 180-220 g / t of sodium sulfide to the Cleaning 1 froth for the second cleaning process to obtain Cleaning 2 froth and Cleaning 2 underflow; add 90-110 g / t of sodium sulfide to the Cleaning 2 froth for the third cleaning process to obtain Cleaning 3 froth and Cleaning 3 underflow; the Cleaning 3 froth is the concentrate product.

4. The beneficiation method for recovering heterodyne from lead-zinc sulfide tailings according to claim 3, characterized in that: The first selected bottom stream returns to the graded operation in step S2, the second selected bottom stream returns to the first selected operation, and the third selected bottom stream returns to the second selected operation.

5. The beneficiation method for recovering heterodyne from lead-zinc sulfide tailings according to claim 1, characterized in that: In step S5, the scavenging reagents include 480-520 g / t of sodium sulfide and 45-55 g / t of the collector; the scavenging foam is returned to the flotation roughing operation in step S4.

6. The beneficiation method for recovering heterodyne from lead-zinc sulfide tailings according to claim 1, characterized in that: In step S1, the predetermined concentration of the first slurry is 30wt%~35wt%.

7. The beneficiation method for recovering heterodyne from lead-zinc sulfide tailings according to claim 1, characterized in that: In step S3, the predetermined concentration of the second slurry is 20wt%~25wt%.

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