Beneficiation system for low-grade lead-silver ore

Abstract

The utility model discloses a beneficiation system for low-grade lead-silver ore. The beneficiation system comprises an ore grinding and grading unit, lead-silver roughing equipment, a lead-silver concentration unit and a lead-silver scavenging unit, and the lead-silver scavenging unit comprises lead-silver scavenging primary equipment, a second-section ore grinding machine, a cyclone, lead-silver scavenging secondary equipment, lead-silver scavenging tertiary equipment and lead-silver scavenging quaternary equipment which are sequentially connected in series. According to the system, after raw ore is subjected to ore grinding and grading, overflow ore pulp is subjected to roughing, rough concentrate obtained through roughing is subjected to concentration through four-stage concentration equipment, lead-silver concentrate is obtained, rough tailings obtained through roughing are subjected to primary scavenging, then two-stage ore grinding and cyclone grading are conducted, then three-stage scavenging is conducted, and the lead-silver tailings are obtained. According to the scheme, the lead recovery rate is 83.64%, the silver recovery rate is 86.32%, waste of metal resources is reduced, environmental pollution is reduced, and economic losses are reduced.

Description

Technical field:

[0001] The utility model belongs to the technical field of mineral processing, and in particular relates to a beneficiation system for low-grade lead-silver ore. Background technology:

[0002] There are not many rich ores in nature that can be used directly for smelting. Especially with the development of industrial production, the reserves of rich ores are gradually decreasing, so more and more poor ores have to be mined. However, it is not economical to smelt low-grade poor ores. In order to reduce smelting costs, effectively extract useful components from ores, and comprehensively utilize national resources, ores mined from mines must be beneficiated before smelting. Ore dressing is a process that uses gravity separation, flotation, magnetic separation, electrostatic separation, etc. to separate useful minerals from gangue minerals according to the physical and chemical properties of different minerals in the ore, and to separate various symbiotic (associated) useful minerals from each other as much as possible, remove or reduce harmful impurities, and obtain the raw materials required for smelting or other industries.

[0003] In the lead and silver metal beneficiation process technology, we usually face the complex properties of low-grade ore, many ions that affect flotation, wide particle size distribution, and mutual wrapping of minerals. These characteristics lead to relatively low lead and silver recovery rates, especially the poor recovery effect of fine-grained and difficult-to-select ores. Previously, the processed ore had low grade, complex and changeable properties, and high oxidation rate. The conventional process of one-stage grinding-classification-two-stage grinding-classification-flotation was very harsh on the selection of lead and silver reagents and process conditions, resulting in a large loss of valuable lead and silver metals, which not only affected economic benefits but also increased environmental pollution. Utility model content:

[0004] The utility model aims to provide a beneficiation system for low-grade lead-silver ore to solve the problems mentioned in the background technology, improve the recovery rate of lead and silver, and reduce resource waste and environmental pollution.

[0005] The utility model is implemented by the following technical solutions:

[0006] A beneficiation system for low-grade lead-silver ore, comprising a grinding and grading unit, a lead-silver roughing device, a lead-silver concentrating unit, and a lead-silver scavenging unit; the overflow slurry outlet of the buffer box of the grinding and grading unit is connected to the feed inlet of the lead-silver roughing device, the coarse concentrate outlet of the lead-silver roughing device is connected to the feed inlet of the lead-silver first concentrating device of the lead-silver concentrating unit, and the coarse tailings outlet of the lead-silver roughing device is connected to the feed inlet of the lead-silver first concentrating device of the lead-silver scavenging unit; the lead-silver scavenging unit comprises a lead-silver first concentrating device, a two-stage grinding machine, a cyclone, a lead-silver second concentrating device, a lead-silver third concentrating device, and a lead-silver fourth concentrating device connected in series in sequence.

[0007] In this system, after the low-grade lead-silver ore is ground and classified by the grinding and classification unit, the overflow slurry is subjected to rough lead-silver selection. After the rough selection, the coarse concentrate enters the lead-silver concentration unit for concentration to obtain lead-silver concentrate; the coarse tailings enter the lead-silver scavenging unit for scavenging, the tailings of the lead-silver scavenging first selection device enter the second-stage grinding machine, and the overflow slurry enters the cyclone for classification. After the overflow slurry of the cyclone, it enters the lead-silver scavenging second selection device, the tailings of the lead-silver scavenging second selection device enter the lead-silver scavenging third selection device, the tailings of the lead-silver scavenging third selection device enter the lead-silver scavenging fourth selection device, and the tailings of the lead-silver scavenging fourth selection device are lead-silver tailings.

[0008] Furthermore, the grinding and classification unit includes a first-stage grinding machine, a classifier, and a buffer box; the pulp outlet of the first-stage grinding machine is connected to the feed port of the classifier; the pulp overflow port of the classifier is connected to the feed port of the buffer box; the coarse sand port of the classifier is connected to the feed port of the first-stage grinding machine. The raw ore is first ground by the first-stage grinding machine, and the pulp coming out enters the classifier for classification, and the pulp overflowing from the classifier flows to the buffer box.

[0009] Furthermore, the lead-silver concentration unit comprises a lead-silver concentration first concentration device, a lead-silver concentration second concentration device, a lead-silver concentration third concentration device, and a lead-silver concentration fourth concentration device connected in series in sequence. The coarse concentrate from the lead-silver roughing device is sequentially subjected to four-stage concentration to obtain a lead-silver concentrate.

[0010] Furthermore, the intermediate ore outlet of the lead-silver fourth selection equipment is connected to the feed port of the lead-silver third selection equipment; the intermediate ore outlet of the lead-silver third selection equipment is connected to the feed port of the lead-silver second selection equipment; the intermediate ore outlet of the lead-silver second selection equipment is connected to the feed port of the lead-silver first selection equipment; the intermediate ore outlet of the lead-silver first selection equipment is connected to the feed port of the lead-silver rough selection equipment. The intermediate ore discharged from the selection equipment is returned to the previous step, and the lead and silver in the ore pulp are separated and screened out as much as possible, so as to improve the recovery rate and reduce resource waste and environmental pollution.

[0011] Furthermore, the intermediate ore outlet of the lead-silver sweeping and selecting equipment is connected to the feed port of the lead-silver sweeping and selecting equipment; the intermediate ore outlet of the lead-silver sweeping and selecting equipment is connected to the feed port of the lead-silver sweeping and selecting equipment; the intermediate ore outlet of the lead-silver sweeping and selecting equipment is connected to the feed port of the lead-silver sweeping and selecting equipment; the intermediate ore outlet of the lead-silver sweeping and selecting equipment is connected to the feed port of the lead-silver roughing selecting equipment. The intermediate ore discharged from the sweeping and selecting equipment is returned to the previous step, and the lead and silver in the ore pulp are separated and screened out as much as possible, so as to improve the recovery rate and reduce resource waste and environmental pollution.

[0012] Furthermore, it also includes a zinc selection unit; the zinc selection unit includes zinc roughing equipment, zinc concentrating equipment, and zinc scavenging equipment; the lead-silver tailings outlet of the lead-silver scavenging equipment is connected to the feed inlet of the zinc roughing equipment, the crude zinc concentrate outlet of the zinc roughing equipment is connected to the feed inlet of the zinc concentrating equipment, and the crude zinc tailings outlet of the zinc roughing equipment is connected to the feed inlet of the zinc scavenging equipment. The lead-silver tailings obtained by the lead-silver scavenging equipment also contain zinc ore, and the zinc selection unit is used to further select the zinc ore in the lead-silver tailings.

[0013] Furthermore, the tailings water outlet of the zinc scavenging equipment is connected to a tailings water sedimentation tank, and the tailings water sedimentation tank is provided with a flocculant inlet. The tailings water is flocculated and precipitated by the flocculant, reducing the influence of the tailings reagent on flotation and improving the quality of the production recycled water.

[0014] Beneficial effects:

[0015] The utility model provides a beneficiation system for low-grade lead-silver ore, wherein the overflow pulp is subjected to rough selection after grinding and grading of the raw ore, the coarse concentrate obtained by the rough selection is selected by four-stage selection equipment to obtain lead-silver concentrate, and the coarse tailings obtained by the rough selection are subjected to a first scavenging selection, second-stage grinding, cyclone classification, and then third-stage scavenging selection to obtain lead-silver tailings. The lead recovery rate of this scheme is 83.64%, and the silver recovery rate is 86.32%, which reduces the waste of metal resources, reduces environmental pollution, and reduces economic losses. The final tailings water is treated with a flocculant to reduce the influence of tailings reagents on flotation and improve the quality of production recycled water. Description of the drawings:

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The schematic diagram of the structure of the beneficiation system of the low-grade lead-silver ore of Example 1;

[0018] Figure 2 This is a schematic diagram of the structure of the ore dressing system for low-grade lead-silver ore in Example 1.

[0019] The accompanying drawings are as follows:

[0020] 10. Grinding and grading unit; 11. First-stage grinding mill; 12. Classifier; 13. Buffer box; 20. Lead-silver roughing equipment; 30. Lead-silver concentrating unit; 31. Lead-silver concentrating equipment; 32. Lead-silver concentrating equipment; 33. Lead-silver concentrating equipment; 34. Lead-silver concentrating equipment; 40. Lead-silver scavenging unit; 41. Lead-silver scavenging equipment; 42. Second-stage grinding mill; 43. Cyclone; 44. Lead-silver scavenging equipment; 45. Lead-silver scavenging equipment; 46. Lead-silver scavenging equipment; 50. Zinc selection unit; 51. Zinc roughing equipment; 52. Zinc concentrating equipment; 53. Zinc scavenging equipment; 60. Tailings water sedimentation tank. Specific implementation method:

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. In the description of the utility model, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] In the following embodiments, the first-stage grinding mill 11 and the second-stage grinding mill 42 used are both ball mills; the lead-silver roughing equipment 20, the lead-silver fine first selection equipment 31, the lead-silver fine second selection equipment 32, the lead-silver fine third selection equipment 33, the lead-silver fine fourth selection equipment 34, the lead-silver scavenging first selection equipment 41, the lead-silver scavenging second selection equipment 44, the lead-silver scavenging third selection equipment 45, the lead-silver scavenging fourth selection equipment 46, the zinc roughing equipment 51, the zinc concentrating equipment 52, and the zinc scavenging equipment 53 are all flotation machines; in the mineral processing process, all the reagents added to the grinding and grading unit 10, the lead-silver roughing equipment 20, the lead-silver concentrating unit 30, the lead-silver scavenging unit 40, and the zinc selecting unit 50 are all prior arts, which will not be elaborated here.

[0023] Example 1

[0024] A beneficiation system for low-grade lead-silver ore, such as Figure 1 As shown, it includes a grinding and classification unit 10, a lead-silver roughing device 20, a lead-silver concentration unit 30, and a lead-silver scavenging unit 40.

[0025] The grinding and classifying unit 10 includes a first-stage grinding machine 11, a classifier 12, and a buffer box 13; the slurry outlet of the first-stage grinding machine 11 is connected to the feed port of the classifier 12; the slurry overflow port of the classifier 12 is connected to the feed port of the buffer box 13; the coarse sand port of the classifier 12 is connected to the feed port of the first-stage grinding machine 11.

[0026] The lead-silver concentration unit 30 includes a lead-silver first concentration equipment 31, a lead-silver second concentration equipment 32, a lead-silver third concentration equipment 33, and a lead-silver fourth concentration equipment 34 which are connected in series in sequence; the intermediate ore outlet of the lead-silver fourth concentration equipment 34 is connected to the feed inlet of the lead-silver third concentration equipment 33; the intermediate ore outlet of the lead-silver third concentration equipment 33 is connected to the feed inlet of the lead-silver second concentration equipment 32; the intermediate ore outlet of the lead-silver second concentration equipment 32 is connected to the feed inlet of the lead-silver first concentration equipment 31.

[0027] The lead-silver scavenging unit 40 includes a lead-silver scavenging first selection device 41, a two-stage grinding machine 42, a cyclone 43, a lead-silver scavenging second selection device 44, a lead-silver scavenging third selection device 45, and a lead-silver scavenging fourth selection device 46 which are connected in series in sequence; the intermediate ore outlet of the lead-silver scavenging fourth selection device 46 is connected to the feed inlet of the lead-silver scavenging third selection device 45; the intermediate ore outlet of the lead-silver scavenging third selection device 45 is connected to the feed inlet of the lead-silver scavenging second selection device 44; the intermediate ore outlet of the lead-silver scavenging second selection device 44 is connected to the feed inlet of the lead-silver scavenging first selection device 41.

[0028] The overflow slurry outlet of the buffer box 13 of the grinding and grading unit 10 is connected to the feed port of the lead-silver roughing equipment 20; the coarse concentrate outlet of the lead-silver roughing equipment 20 is connected to the feed port of the lead-silver first selection equipment 31, and the intermediate ore outlet of the lead-silver first selection equipment 31 is connected to the feed port of the lead-silver roughing equipment 20; the coarse tailings outlet of the lead-silver roughing equipment 20 is connected to the feed port of the lead-silver first selection equipment 41, and the intermediate ore outlet of the lead-silver first selection equipment 41 is connected to the feed port of the lead-silver roughing equipment 20.

[0029] Example 2

[0030] A beneficiation system for low-grade lead-silver ore, which is the same as Example 1 in its entirety, except that: Figure 2 As shown, it also includes a zinc selection unit 50. The zinc selection unit 50 includes a zinc roughing device 51, a zinc concentrating device 52, and a zinc scavenging device 53; the lead-silver tailings outlet of the lead-silver scavenging device 46 is connected to the feed inlet of the zinc roughing device 51, the coarse zinc concentrate outlet of the zinc roughing device 51 is connected to the feed inlet of the zinc concentrating device 52, and the coarse zinc tailings outlet of the zinc roughing device 51 is connected to the feed inlet of the zinc scavenging device 53. The tailings water outlet of the zinc scavenging device 53 is connected to a tailings water sedimentation tank 60, and the tailings water sedimentation tank 60 is provided with a flocculant inlet.

[0031] The zinc concentrating device 52 can be a single concentrating device or multiple concentrating devices connected in series, and the zinc scavenging device 53 can be a single scavenging device or multiple scavenging devices connected in series. The zinc concentrating unit 50 may not be provided, and the tailings water outlet of the lead-silver scavenging device 46 is connected to the tailings water sedimentation tank 60, and the tailings water sedimentation tank 60 is provided with a flocculant inlet.

[0032] Example 3

[0033] The low-grade lead-silver ore beneficiation system of Example 2 was used for beneficiation, and the lead grade of the raw ore was 1.22%, the zinc grade was 1.24%, and the silver grade was 95 g / t.

[0034] The raw ore enters the first-stage grinding machine 11 for grinding, the overflow concentration is adjusted to 43%, the grinding fineness -0.074mm content is 68%, and then the overflow pulp of the classifier 12 enters the buffer box 13, the bottom slurry returns to the first-stage grinding machine 11 for further processing, and the pulp in the buffer box 13 enters the lead-silver roughing device 20. After roughing, the coarse concentrate enters the lead-silver concentration unit 30, and the coarse tailings are subjected to the lead-silver scavenging unit 40.

[0035] In the lead-silver concentration unit 30, the coarse concentrate is sequentially subjected to the lead-silver concentration first selection device 31, the lead-silver concentration second selection device 32, the lead-silver concentration third selection device 33, and the lead-silver concentration fourth selection device 34 for multi-stage concentration to obtain the lead-silver concentrate, and the intermediate ore of each level of concentration equipment is returned to the previous level for further concentration. In the lead-silver scavenging unit 40, the coarse tailings are preliminarily scavenged by the lead-silver scavenging first selection device 41, and the tailings slurry enters the second-stage grinding mill 42. After ball milling, the overflow slurry enters the cyclone 43 for classification. The overflow concentration of the cyclone 43 is adjusted to 37%, and the grinding fineness -0.074mm content is 75%, and then it is driven into the lead-silver scavenging second selection device 44. The lead-silver scavenging second selection tailings are sequentially subjected to the lead-silver scavenging third selection device 45 and the lead-silver scavenging fourth selection device 46 for scavenging to obtain the lead-silver tailings, and the intermediate ore of each level of scavenging equipment is returned to the previous level for further scavenging.

[0036] The lead-silver tailings can be processed by the zinc selection unit 50 for roughing, concentrating and scavenging. The final tailings water enters the tailings water sedimentation tank 60 for treatment. The added flocculants are 1099 and / or 6020 (purchased from Hebei Dongfa Environmental Protection Technology Co., Ltd.). The reagents added for tailings water treatment are changed from traditional aluminum chloride to 1099 and 6020, which reduces the impact of tailings reagents on flotation and improves the quality of production reuse water. The results after treatment are shown in Table 1.

[0037] Table 1 Example 3 Ore dressing separation test results

[0038]

[0039] The results in Table 1 show that the lead recovery rate is 83.64%, the zinc recovery rate is 23.12%, the silver recovery rate is 86.32%, the lead grade is 48.01%, the silver grade is 3850g / t, and the zinc content of the lead concentrate is 13.46%.

[0040] Comparative Example 1

[0041] The low-grade lead-silver ore beneficiation system of Example 2 was used for beneficiation, and the lead grade of the raw ore was 1.19%, the zinc grade was 1.33%, and the silver grade was 86 g / t.

[0042] The raw ore enters the first-stage grinding machine 11 for grinding, the overflow concentration is adjusted to 43%, the grinding fineness -0.074mm content is 68%, and then the overflow pulp of the classifier 12 enters the buffer box 13, the bottom slurry returns to the first-stage grinding machine 11 for further processing, and the pulp in the buffer box 13 enters the lead-silver roughing device 20. After roughing, the coarse concentrate enters the lead-silver concentration unit 30, and the coarse tailings are subjected to the lead-silver scavenging unit 40.

[0043] In the lead-silver concentration unit 30, the coarse concentrate is sequentially subjected to the lead-silver concentration first selection device 31, the lead-silver concentration second selection device 32, the lead-silver concentration third selection device 33, and the lead-silver concentration fourth selection device 34 for multi-stage concentration to obtain the lead-silver concentrate, and the intermediate ore of each level of concentration equipment is returned to the previous level for further concentration. In the lead-silver scavenging unit 40, the coarse tailings are preliminarily scavenged by the lead-silver scavenging first selection device 41, and the tailings slurry enters the second-stage grinding mill 42. After ball milling, the overflow slurry enters the cyclone 43 for classification. The overflow concentration of the cyclone 43 is adjusted to 37%, and the grinding fineness -0.074mm content is 75%, and then it is driven into the lead-silver scavenging second selection device 44. The lead-silver scavenging second selection tailings are sequentially subjected to the lead-silver scavenging third selection device 45 and the lead-silver scavenging fourth selection device 46 for scavenging to obtain the lead-silver tailings, and the intermediate ore of each level of scavenging equipment is returned to the previous level for further scavenging.

[0044] The lead-silver tailings can be processed by the zinc selection unit 50 for roughing, concentrating and scavenging, and the final tailings water enters the tailings water sedimentation tank 60 for treatment, and aluminum chloride is added to generate precipitation. The results after treatment are shown in Table 2.

[0045] Table 2 Comparative Example 1 Ore dressing separation test results

[0046]

[0047] As shown in Table 2, the lead recovery rate is 81.41%, the zinc recovery rate is 24.30%, the silver recovery rate is 84.57%, the lead grade is 44.25%, the silver grade is 3321g / t, and the lead concentrate contains 14.76% zinc.

[0048] Comparative Example 2

[0049] The low-grade lead-silver ore is beneficiated, and its lead grade, zinc grade and silver grade are 1.26%, 1.23% and 88g / t respectively. The raw ore enters the first-stage grinding machine for grinding, and the overflow pulp concentration is adjusted to 43%, and the grinding fineness -0.074mm content is 68%. Then the overflow pulp of the classifier is driven into the cyclone for classification, and the cyclone return sand enters the second-stage grinding machine for secondary grinding. The second-stage grinding pulp is driven into the cyclone for classification again, and the overflow pulp concentration of the cyclone classification is adjusted to 37%, and the grinding fineness -0.074mm content is 75%. The overflow pulp of the cyclone is subjected to rough lead and silver selection, and the coarse concentrate is selected by three series-connected lead and silver selection equipment to obtain lead and silver concentrate, and the coarse tailings are scavenged by three series-connected lead and silver scavenging equipment to obtain lead and silver tailings. The lead-silver tailings can be processed by the zinc selection unit for roughing, concentrating and scavenging, and the final tailings water enters the tailings water sedimentation tank for treatment, and the added flocculants are 1099 and / or 6020. The results after treatment are shown in Table 3.

[0050] Table 3 Comparative Example 2 Ore dressing separation test results

[0051]

[0052] The results in Table 3 show that the lead recovery rate is 78.38%, the zinc recovery rate is 23.41%, the silver recovery rate is 83.96%, the lead grade is 47.81%, the silver grade is 3587g / t, and the lead concentrate contains 13.98% zinc.

[0053] It can be seen that compared with Comparative Example 2, this system can significantly improve the recovery rate of lead and silver, thereby solving the recovery rate of complex ores such as low grade, many internal ions affecting flotation, wide particle size distribution, and mutual encapsulation of minerals in lead and silver metal beneficiation, which helps to increase economic income and reduce resource waste.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A beneficiation system for low-grade lead-silver ore, characterized in that: It includes grinding and grading unit, lead-silver roughing equipment, lead-silver concentrating unit, and lead-silver scavenging unit; The overflow slurry outlet of the buffer box of the grinding and classification unit is connected to the feed inlet of the lead-silver roughing equipment, the coarse concentrate outlet of the lead-silver roughing equipment is connected to the feed inlet of the lead-silver first selection equipment of the lead-silver concentration unit, and the coarse tailings outlet of the lead-silver roughing equipment is connected to the feed inlet of the lead-silver first selection equipment of the lead-silver scavenging unit; The lead-silver scavenging unit comprises a lead-silver scavenging first selection device, a second-stage grinding machine, a cyclone, a lead-silver scavenging second selection device, a lead-silver scavenging third selection device, and a lead-silver scavenging fourth selection device which are connected in series in sequence.

2. A beneficiation system for low-grade lead-silver ore according to claim 1, characterized in that: The grinding and classifying unit includes a first-stage grinding mill, a classifier, and a cache box; the slurry outlet of the first-stage grinding mill is connected to the feed port of the classifier; the slurry overflow port of the classifier is connected to the feed port of the cache box; the coarse sand port of the classifier is connected to the feed port of the first-stage grinding mill.

3. The beneficiation system for low-grade lead-silver ore according to claim 1, characterized in that: The lead-silver concentration unit comprises a first lead-silver concentration device, a second lead-silver concentration device, a third lead-silver concentration device and a fourth lead-silver concentration device which are connected in series in sequence.

4. A beneficiation system for low-grade lead-silver ore according to claim 3, characterized in that: The intermediate ore outlet of the lead-silver fine fourth selection equipment is connected to the feed inlet of the lead-silver fine third selection equipment; the intermediate ore outlet of the lead-silver fine third selection equipment is connected to the feed inlet of the lead-silver fine second selection equipment; the intermediate ore outlet of the lead-silver fine second selection equipment is connected to the feed inlet of the lead-silver fine first selection equipment; the intermediate ore outlet of the lead-silver fine first selection equipment is connected to the feed inlet of the lead-silver rough selection equipment.

5. The beneficiation system for low-grade lead-silver ore according to claim 1, characterized in that: The intermediate ore outlet of the lead-silver sweeping and four-selection equipment is connected with the feed inlet of the lead-silver sweeping and three-selection equipment; the intermediate ore outlet of the lead-silver sweeping and three-selection equipment is connected with the feed inlet of the lead-silver sweeping and two-selection equipment; the intermediate ore outlet of the lead-silver sweeping and two-selection equipment is connected with the feed inlet of the lead-silver sweeping and one-selection equipment; the intermediate ore outlet of the lead-silver sweeping and one-selection equipment is connected with the feed inlet of the lead-silver roughing equipment.

6. The beneficiation system for low-grade lead-silver ore according to claim 1, characterized in that: It also includes a zinc selection unit; the zinc selection unit includes zinc roughing equipment, zinc concentrating equipment, and zinc scavenging equipment; the lead-silver tailings outlet of the lead-silver scavenging equipment is connected to the feed inlet of the zinc roughing equipment, the crude zinc concentrate outlet of the zinc roughing equipment is connected to the feed inlet of the zinc concentrating equipment, and the crude zinc tailings outlet of the zinc roughing equipment is connected to the feed inlet of the zinc scavenging equipment.

7. A beneficiation system for low-grade lead-silver ore according to claim 6, characterized in that: The tailings water outlet of the zinc scavenging equipment is connected to a tailings water sedimentation tank, and the tailings water sedimentation tank is provided with a flocculant inlet.

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