Beneficiation system for complex gold-silver mixed lead-zinc polymetallic ore

Abstract

The utility model relates to an ore dressing system for complex gold-silver mixed lead-zinc polymetallic ore, which comprises a first-section mill, a discharge port of the first-section mill is connected with a feed port of a spiral classifier, a sand setting ore discharge port of the spiral classifier is connected with the feed port of the first-section mill, and an overflow ore discharge port of the spiral classifier is connected with a feed port of a 1 # stirring barrel; a discharging port of the first stirring barrel is connected with a feeding port of the second stirring barrel, a discharging port of the second stirring barrel is connected with an ore feeding pipe of the first lead roughing machine, a concentrate port of the first lead roughing machine is connected with an ore feeding pipe of the first lead classificator through the first pump pool and the first pump, and the first lead classificator is sequentially connected with the second lead classificator and the third lead classificator. According to the embedded particle size of the lead-zinc ore and the oxidation rate of lead, the mineral separation system with stage grinding and stage lead flotation, reselection and zinc flotation is adopted for separation of complex mixed lead-zinc polymetallic ore containing gold and silver, the practicability is high, the separation and recovery effect is remarkable, and the recovery rate of the mixed lead-zinc ore can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ore dressing, and in particular relates to an ore dressing system for complex gold-silver mixed lead-zinc polymetallic ore. Background Art

[0002] In modern industrial non-ferrous metal consumption, lead and zinc are second only to aluminum and copper. The properties of the ores being processed are becoming more and more complex. In order to improve the resource utilization rate of lead-zinc mines and obtain high-quality lead-zinc products, it is increasingly important to improve lead-zinc beneficiation technology. At present, flotation is the most commonly used and most effective beneficiation method for lead-zinc mines. The mainstream production method adopts the priority flotation method. The priority flotation method mostly adopts "zinc suppression and lead floating". For high-grade oxidized lead-zinc ores with high flotation difficulty and simple mineral composition, pre-sulfidation treatment is basically adopted, and then priority flotation is carried out. However, for complex mixed lead-zinc polymetallic ores containing gold and silver, the existing process is used and the following problems exist:

[0003] 1. Due to the complex nature of the original ore, the particle size of the useful minerals is uneven, the coarse and fine particles are polarized, the lead oxidation rate is high, and the precious metals gold and silver are accompanied. The conventional "zinc suppression and lead floating" process cannot efficiently recover lead, gold and silver, resulting in poor recovery of lead, gold and silver in lead concentrate. At the same time, the silver element moves into the zinc concentrate or tailings, the valuation coefficient is low or lost, and the comprehensive utilization value of useful minerals is low;

[0004] 2. For the conventional "zinc suppression and lead flotation" process of mixed lead-zinc ore, sulfiding agents and a large amount of zinc inhibitors need to be added during the flotation separation process. The use of sulfiding agents has high requirements. If the dosage is small, the sulfidation effect is not obvious. If the dosage is too large, the sulfidation effect is good, but it will inhibit the sulfide minerals in the original ore; at the same time, the large amount of zinc inhibitors used, firstly, the associated precious metals gold and silver will be suppressed to a certain extent, and secondly, a large amount of activators need to be added for activation in the later zinc selection, which leads to an increase in the reagent cost of the ore dressing plant and affects the economic benefits of the enterprise.

[0005] In order to overcome the problems existing in the existing lead-zinc ore flotation process, the utility model proposes a beneficiation system for complex gold-silver mixed lead-zinc polymetallic ore to improve the recovery rate of valuable metals gold, silver, lead and zinc in complex lead-zinc ore, reduce the cost of reagents in production, and improve the economic benefits of the enterprise. Utility Model Content

[0006] In view of the above problems, the utility model provides a beneficiation system for complex polymetallic ores containing mixed gold, silver, lead and zinc.

[0007] The specific technical solution is: a beneficiation process for complex gold-silver mixed lead-zinc polymetallic ore, comprising the following steps:

[0008] (1) First-stage grinding and classification: The raw ore is added to the first-stage mill for grinding, and then the slurry is transported to the spiral classifier for classification. The coarse particles are screwed into the first-stage mill feed port by the spiral blade for re-grinding. The fine particles less than 0.074 mm reach 60% and are introduced into the 1# mixing tank through the overflow pipe;

[0009] (2) One-stage lead flotation operation: Add zinc sulfide inhibitor to the 1# mixing barrel to adjust the slurry, and then flow into the 2# mixing barrel. Add collector to the 2# mixing barrel to adjust the slurry, and then introduce it into the flotation machine for lead, gold and silver flotation. After one lead roughing and three lead cleaning, roughing tailings and lead concentrate are obtained;

[0010] (3) Secondary grinding and classification: The roughing tailings are slurried and pumped into the hydrocyclone for classification. The classified sand is then sent to the secondary mill for re-grinding. The particles with a graded overflow particle size of less than 0.043 mm and reaching 80% are introduced into the 3# mixing tank;

[0011] (4) Secondary lead flotation operation: Add zinc sulfide inhibitor to the 3# mixing barrel to mix the slurry and then flow it into the 4# mixing barrel. Add collector to the 4# mixing barrel and stir it before introducing it into the flotation machine for lead, gold and silver flotation. After one lead roughing, one lead scavenging and three lead cleaning processes, scavenging tailings and lead concentrate are obtained.

[0012] (5) Shaking table gravity separation operation: After the scavenging tailings are introduced into the 5# mixing barrel, they are transferred to the shaking table gravity separation to obtain shaking table tailings and lead concentrate II;

[0013] (6) Zinc flotation operation: The shaking table tailings are introduced into the 6# mixing barrel, and the zinc activator is added to the slurry to flow into the 7# mixing barrel. After adding the collector in the 7# mixing barrel and stirring, the tailings are introduced into the flotation machine for zinc flotation. After the first zinc roughing, second zinc scavenging and third zinc cleaning, zinc concentrate and total tailings are obtained.

[0014] Furthermore, the grinding concentration in step (1) is 70% to 75%.

[0015] Furthermore, in step (1), the concentration of the ore pulp classified by the spiral classifier is 30% to 35%.

[0016] Furthermore, the inhibitors of zinc sulfide in steps (2) and (4) are zinc sulfate and sodium sulfite, and the addition amounts thereof are 800-1500 g / t of zinc sulfate and 200-600 g / t of sodium sulfite, respectively.

[0017] Furthermore, the collectors in steps (2) and (4) are ethylthiocyanate, butylammonium nitropropoxide and pine oil, and the added amounts are 80-150 g / t of ethylthiocyanate, 30-50 g / t of butylammonium nitropropoxide and 50-80 g / t of pine oil, respectively.

[0018] Furthermore, in step (3), the slurry concentration of the roughing tailings is adjusted to 30% to 32%.

[0019] Furthermore, in step (4), 20 g / t of ethylthiocyanate, 5 g / t of butylammonium chloride and 5 g / t of pine oil are added during the lead scavenging process;

[0020] Furthermore, the activator in step (6) is copper sulfate, and its addition amount is 80-120 g / t.

[0021] Furthermore, the collectors in step (6) are butyl xanthate and pine oil, and the added amounts are 80-120 g / t of butyl xanthate and 30-50 g / t of pine oil, respectively.

[0022] Furthermore, in step (6), 20 g / t of copper sulfate, 30 g / t of butyl xanthate, and 5 g / t of pine oil were added during the first zinc scavenging, and 10 g / t of butyl xanthate and 5 g / t of pine oil were added during the second zinc scavenging.

[0023] Furthermore, the slurry preparation time in the stirring barrel in steps (2), (4) and (6) is 5 minutes.

[0024] The utility model also proposes a beneficiation system for complex gold-silver mixed lead-zinc polymetallic ore, comprising a first-stage mill, the discharge port of the first-stage mill is connected to the feed port of a spiral classifier, the sand discharge port of the spiral classifier is connected to the feed port of the first-stage mill, and the overflow discharge port of the spiral classifier is connected to the feed port of a 1# mixing barrel;

[0025] The discharge port of the 1# mixing barrel is connected to the feed port of the 2# mixing barrel, the discharge port of the 2# mixing barrel is connected to the feed pipe of the lead rougher 1, the concentrate port of the lead rougher 1 is connected to the feed pipe of the lead concentrator 1 through the 1# pump pool and the 1# pump, and the lead concentrator 1 is connected to the lead concentrator 2 and the lead concentrator 3 in sequence;

[0026] The tailings pipe of the lead rougher 1 is connected to the feed port of the hydrocyclone through the 2# pump pool and the 2# pump, the sand settling port of the hydrocyclone is connected to the feed port of the second-stage mill, the discharge port of the second-stage mill is connected to the feed port of the hydrocyclone, and the overflow port of the hydrocyclone is connected to the feed port of the 3# mixing barrel;

[0027] The discharge port of the 3# mixing barrel is connected to the feed port of the 4# mixing barrel, the discharge port of the 4# mixing barrel is connected to the feed pipe of the lead rougher 2, the lead rougher 2 is connected to the lead scavenger, the concentrate port of the lead rougher 2 is connected to the feed pipe of the lead concentrator 1 through the 1# pump pool and the 1# pump, and the tailings pipe of the lead scavenger is connected to the feed port of the 5# mixing barrel;

[0028] The discharge port of the 5# mixing barrel is connected to the feed chute of the shaking table gravity separator, and the tailings side of the shaking table gravity separator is connected to the feed port of the 6# mixing barrel;

[0029] The discharge port of the 6# mixing barrel is connected to the feed port of the 7# mixing barrel, the discharge port of the 7# mixing barrel is connected to the tailings pipe of the zinc rougher, the tailings pipe of the zinc rougher is connected to zinc scavenger 1 and zinc scavenger 2 in sequence, and the concentrate port of the zinc rougher is connected to zinc concentrator 1, zinc concentrator 2 and zinc concentrator 3 in sequence.

[0030] It should be noted that, since each flotation unit will obtain a concentrate and a tailing after a certain period of flotation, in order to make the flotation more thorough, the concentrate (foam product) will generally enter the next flotation unit, while the tailings will return to the previous flotation unit for floating again. Therefore, it is necessary to form a circulation loop between the flotation machines of each flotation unit.

[0031] Furthermore, the tailings pipe of the lead concentrator three is connected to the feed pipe of the lead concentrator two, and the tailings pipe of the lead concentrator two is connected to the feed pipe of the lead concentrator one, so that a circulation loop is formed between the lead concentrator three and the lead concentrator two, and between the lead concentrator two and the lead concentrator one.

[0032] Furthermore, the tailings pipe of the lead scavenger is connected to the feed pipe of the lead rougher one, so that a circulation loop is formed between the lead scavenger and the lead rougher one.

[0033] Furthermore, the tailings pipe of the zinc scavenger 2 is connected to the feed pipe of the zinc scavenger 1, and the tailings pipe of the zinc scavenger 1 is connected to the feed pipe of the zinc rougher, so that a circulation loop is formed between the zinc scavenger 2 and the zinc scavenger 1, and between the zinc scavenger 1 and the zinc rougher.

[0034] Furthermore, the tailings pipe of the zinc concentrator three is connected to the feed pipe of the zinc concentrator two, the tailings pipe of the zinc concentrator two is connected to the feed pipe of the zinc concentrator one, and the tailings pipe of the zinc concentrator one is connected to the feed pipe of the zinc rougher, so that a circulation loop is formed between the zinc concentrator three and the zinc concentrator two, the zinc concentrator two and the zinc concentrator one, and the zinc concentrator one and the zinc rougher.

[0035] Beneficial effects of the utility model: According to the embedded particle size of lead-zinc minerals and the oxidation rate of lead, the utility model adopts a beneficiation system of stage grinding, stage lead flotation + gravity separation + zinc flotation for the separation of complex gold-silver mixed lead-zinc polymetallic ores. It has strong practicality and significant separation and recovery effects, solves the problem of low recovery rate of mixed lead-zinc ores in the existing lead-zinc ore flotation process, improves the comprehensive utilization rate of valuable metals, reduces the cost of production reagents, and improves the economic benefits of separation. The specific beneficial technical effects are reflected in the following aspects:

[0036] (1) The utility model adopts a two-stage grinding + two-stage flotation system, which preferentially floats the coarse-grained gold, silver and lead concentrates to avoid over-grinding and reduce the recovery rate, and then performs classification and re-grinding to fully dissociate the useful minerals into monomers, further recover gold, silver and lead, and at the same time ensure the complete recovery of lead sulfide through scavenging.

[0037] (2) Adding a shaking table gravity separation system before zinc flotation can effectively remove lead oxide and fine gold and silver that are difficult to recover by lead flotation, reduce the mutual content of lead and zinc concentrate, and the shaking table separation can have a de-doping effect, which can reduce the impact of sulfiding reagents on zinc flotation, reduce the amount of subsequent zinc flotation activation reagents, and reduce reagent costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a process flow chart of the beneficiation of a complex gold-silver mixed lead-zinc polymetallic ore of the utility model;

[0039] Figure 2 This is a diagram of the equipment of a mineral processing system for a complex gold-silver mixed lead-zinc polymetallic ore of the utility model;

[0040] In the figure: 101- first stage mill, 102- second stage mill; 2- spiral classifier; 301- 1# mixing barrel, 302- 2# mixing barrel, 303- 3# mixing barrel, 304- 4# mixing barrel, 305- 5# mixing barrel, 306- 6# mixing barrel, 307- 7# mixing barrel; 401- lead roughing machine 1, 402- lead concentrator 1, 403- lead concentrator 2, 404- lead concentrator 3, 405-lead rougher 2, 406-lead scavenger; 501-1# pump pool, 502-1# pump, 503-2# pump pool, 504-2# pump; 6-hydraulic cyclone; 7-shaking table gravity separator; 801-zinc rougher, 802-zinc scavenger 1, 803-zinc scavenger 2, 804-zinc concentrator 1, 805-zinc concentrator 2, 806-zinc concentrator 3; 9-ore bin; 10-belt conveyor. DETAILED DESCRIPTION

[0041] In order to make the technical problems and technical solutions solved by the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0042] Example 1

[0043] Mineral 1#: A complex lead-zinc polymetallic ore containing gold and silver. The lead minerals are mainly galena, cerussite, lead alum and phospho (arsenic, vanadium) lead chloride, etc., with a lead grade of 3.25%, of which the cumulative share of lead oxide is 35.52%, with a high oxidation rate; the zinc mineral is mainly sphalerite, which contains less iron impurities and has a low oxidation rate, with a zinc grade of 1.86%. In addition to the main recovered metal lead and zinc, the associated valuable metal elements are mainly gold and silver, with grades of 3.02g / t and 80.53g / t respectively. The gangue minerals are mainly quartz, calcite, feldspar, garnet, chlorite, etc.

[0044] The ore dressing process and ore dressing system described in the utility model are used to recover the valuable metals in the above-mentioned mineral 1#. The specific implementation process is as follows:

[0045] (1) First-stage grinding and classification: The gold-silver mixed lead-zinc polymetallic ore to be selected in the ore bin 9 is conveyed to the first-stage mill 101 through the belt conveyor 10, and 600 g / t of sodium carbonate as an adjusting agent is added to the mill to adjust the pH value of the pulp to 8-9. The grinding concentration is 70%-75%, and then the pulp is conveyed to the spiral classifier 2 for classification. The classification pulp concentration is adjusted to 30%-35%. The coarse particles above 0.074 are screwed into the feed port of the first-stage mill 101 by the spiral sheet for re-grinding, and the fine particles of -0.074 mm reach 65% and are introduced into the 1# mixing barrel 301 from the overflow pipe.

[0046] (2) One-stage lead flotation operation: zinc sulfate (1000 g / t) and sodium sulfite (400 g / t), which are inhibitors of zinc sulfide, are added to the 1# mixing barrel 301. After 5 minutes of slurry mixing, the mixture flows into the 2# mixing barrel 302. Collectors such as ethyl dithiocarbamide (60 g / t), butyl ammonium black powder (30 g / t) and pine oil (30 g / t) are added to the 2# mixing barrel 302. After 5 minutes of slurry mixing, the mixture is introduced into a flotation machine for lead, gold and silver flotation. The mixture first enters the lead rougher 401 for primary roughing. The rougher concentrate then enters the lead concentrator 402, the lead concentrator 403 and the lead concentrator 404 for tertiary concentrating to obtain a lead concentrate 1 and a rougher tailing.

[0047] (3) Secondary grinding and classification: The roughing tailings are pumped into the 2# pump pool 502 to be adjusted to 30% to 32% and then pumped into the hydrocyclone 6 for classification. The classified sand particle size of 0.043 mm or above is entered into the secondary mill 102 for re-grinding. The classified overflow particle size of -0.043 mm reaching 85% is introduced into the 3# mixing barrel 303.

[0048] (4) Secondary lead flotation operation: zinc sulfate (400 g / t) and sodium sulfite (150 g / t) as inhibitors of zinc sulfide are added to the 3# mixing barrel 303, and the mixture is mixed for 5 minutes before flowing into the 4# mixing barrel 304. Collectors such as ethyl dithiocarbamide (40 g / t), butyl ammonium nitrosulfate (20 g / t) and pine oil (15 g / t) are added to the 4# mixing barrel 304, and the mixture is mixed for 5 minutes before flowing into the flotation machine for lead, gold and silver flotation. The mixture first flows into the lead rougher 405 for a roughing operation, and the rougher tailings flow into the lead scavenger 406 for a scavenging operation. The scavenging concentrate and the rougher concentrate then flow into the lead concentrator 1 402, the lead concentrator 2 403 and the lead concentrator 3 404 for three concentrating operations, thereby obtaining the lead concentrate 1 and the scavenging tailings.

[0049] Among them, 20g / t of ethylthiocyanate, 5g / t of butyl ammonium black powder and 5g / t of pine oil were added during lead scavenging.

[0050] (5) Shaking table gravity separation operation: the scavenging tailings are introduced into the 5# mixing barrel 305 for slurry preparation and then transferred to the shaking table gravity separation machine 7 for gravity separation to obtain the shaking table tailings and lead concentrate II;

[0051] (6) Zinc flotation operation: The shaking table tailings are introduced into the 6# mixing barrel 306, and 80 g / t of copper sulfate is added to the slurry for 5 minutes, and then the tailings are introduced into the 7# mixing barrel 307. In the 7# mixing barrel 307, 70 g / t of butyl xanthate and 15 g / t of pine oil are added. After 5 minutes of slurry mixing, the tailings are introduced into the flotation machine for zinc flotation. First, the tailings enter the zinc rougher 801 for primary roughing. The rougher tailings enter the zinc scavenger 1 802 and the zinc scavenger 2 803 in turn for secondary scavenging. The rougher concentrate and the scavenger concentrate enter the zinc concentrator 1 804, the lead concentrator 2 403, and the lead concentrator 3 404 in turn for tertiary concentrating to obtain zinc concentrate and total tailings.

[0052] Among them, 20g / t of copper sulfate, 30g / t of butyl xanthate and 5g / t of pine oil were added to zinc scavenging process one; 10g / t of butyl xanthate and 5g / t of pine oil were added to zinc scavenging process two.

[0053] After flotation recovery, the recovery of mineral 1# is shown in Table 1:

[0054] Table 1: Recovery results of mineral 1#

[0055]

[0056] Example 2

[0057] Mineral 2#: A complex lead-zinc polymetallic ore containing mixed gold and silver. The lead minerals are mainly galena, cerussite, lead alum and phosphotyros (arsenic, vanadium) lead chloride, etc., with a lead grade of 2.68%, of which the cumulative share of lead oxide is 46.36%, and the oxidation rate is relatively high; the zinc mineral is mainly sphalerite, which contains less iron impurities and has a low oxidation rate, with a zinc grade of 3.56%; in addition to the main recovered metallic lead and zinc, the associated valuable metal elements are mainly gold and silver, with grades of 2.62g / t and 86.24g / t respectively; the gangue minerals are mainly quartz, calcite, feldspar, garnet, chlorite, etc.

[0058] The ore dressing process and ore dressing system described in the utility model are used to recover the valuable metals in the above-mentioned mineral 2#. The specific implementation process is as follows:

[0059] (1) First-stage grinding and classification: The gold-silver mixed lead-zinc polymetallic ore to be selected in the ore bin 9 is conveyed to the first-stage mill 101 through the belt conveyor 10, and 600 g / t of sodium carbonate as an adjusting agent is added to the mill to adjust the pH value of the pulp to 8-9. The grinding concentration is 70%-75%, and then the pulp is conveyed to the spiral classifier 2 for classification. The classification pulp concentration is adjusted to 30%-35%. The coarse particles above 0.074 are rotated into the feed port of the first-stage mill 101 by the spiral sheet for re-grinding, and the fine particles of -0.074 mm reach 62% and are introduced into the 1# mixing barrel 301 from the overflow pipe.

[0060] (2) One-stage lead flotation operation: zinc sulfate (1000 g / t) and sodium sulfite (400 g / t), which are inhibitors of zinc sulfide, are added to the 1# mixing barrel 301. After 5 minutes of slurry mixing, the mixture flows into the 2# mixing barrel 302. Collectors such as ethyl dithiocarbamide (60 g / t), butyl ammonium black powder (30 g / t) and pine oil (30 g / t) are added to the 2# mixing barrel 302. After 5 minutes of slurry mixing, the mixture is introduced into a flotation machine for lead, gold and silver flotation. The mixture first enters the lead rougher 401 for primary roughing. The rougher concentrate then enters the lead concentrator 402, the lead concentrator 403 and the lead concentrator 404 for tertiary concentrating to obtain a lead concentrate 1 and a rougher tailing.

[0061] (3) Secondary grinding and classification: The roughing tailings are pumped into the 2# pump pool 502 to be adjusted to 30% to 32% and then pumped into the hydrocyclone 6 for classification. The classified sand particle size of 0.043 mm or above is entered into the secondary mill 102 for re-grinding. The classified overflow particle size of -0.043 mm reaching 80% is introduced into the 3# mixing barrel 303.

[0062] (4) Secondary lead flotation operation: zinc sulfate (400 g / t) and sodium sulfite (150 g / t) as inhibitors of zinc sulfide are added to the 3# mixing barrel 303, and the mixture is mixed for 5 minutes before flowing into the 4# mixing barrel 304. Collectors such as ethyl dithiocarbamide (40 g / t), butyl ammonium nitrosulfate (20 g / t) and pine oil (15 g / t) are added to the 4# mixing barrel 304, and the mixture is mixed for 5 minutes before flowing into the flotation machine for lead, gold and silver flotation. The mixture first flows into the lead rougher 405 for a roughing operation, and the rougher tailings flow into the lead scavenger 406 for a scavenging operation. The scavenging concentrate and the rougher concentrate then flow into the lead concentrator 1 402, the lead concentrator 2 403 and the lead concentrator 3 404 for three concentrating operations, thereby obtaining the lead concentrate 1 and the scavenging tailings.

[0063] Among them, 20g / t of ethylthiocyanate, 5g / t of butyl ammonium black powder and 5g / t of pine oil were added during lead scavenging.

[0064] (5) Shaking table gravity separation operation: the scavenging tailings are introduced into the 5# mixing barrel 305 for slurry preparation and then transferred to the shaking table gravity separation machine 7 for gravity separation to obtain the shaking table tailings and lead concentrate II;

[0065] (6) Zinc flotation operation: The shaking table tailings are introduced into the 6# mixing barrel 306, and 80 g / t of copper sulfate is added to the slurry for 5 minutes, and then the tailings are introduced into the 7# mixing barrel 307. In the 7# mixing barrel 307, 70 g / t of butyl xanthate and 15 g / t of pine oil are added. After 5 minutes of slurry mixing, the tailings are introduced into the flotation machine for zinc flotation. First, the tailings enter the zinc rougher 801 for primary roughing. The rougher tailings enter the zinc scavenger 1 802 and the zinc scavenger 2 803 in turn for secondary scavenging. The rougher concentrate and the scavenger concentrate enter the zinc concentrator 1 804, the lead concentrator 2 403, and the lead concentrator 3 404 in turn for tertiary concentrating to obtain zinc concentrate and total tailings.

[0066] Among them, 20g / t of copper sulfate, 30g / t of butyl xanthate and 5g / t of pine oil were added to zinc scavenging process one; 10g / t of butyl xanthate and 5g / t of pine oil were added to zinc scavenging process two.

[0067] After flotation recovery, the recovery of mineral 1# is shown in Table 2:

[0068] Table 2: Recovery results of mineral 2#

[0069]

[0070] In summary of the above embodiments, the utility model adopts the process and supporting system of stage grinding, stage lead flotation + gravity separation + zinc flotation to recover the lead concentrate and zinc concentrate containing gold and silver according to the embedded particle size of lead-zinc minerals and the oxidation rate of lead. First, after the raw ore is graded by a stage of grinding, the coarse-grained gold, silver and lead concentrates are preferentially floated to avoid over-grinding of the coarse-grained gold, silver and lead to ensure their recovery rate; then the roughing tailings are graded and re-grinded to fully dissociate the useful minerals in the fine-grained level, and the fine-grained gold, silver and lead are recovered through secondary roughing. The tailings of the secondary roughing are scavenged again to ensure that the lead sulfide is completely recovered. Secondly, the scavenging tailings utilize the difference in specific gravity of gold, silver, lead ore and zinc ore, and use a shaking table for gravity separation to effectively recover the lead oxide in the raw ore and the incomplete fine-grained gold and silver recovered by the flotation process. Moreover, since the shaking table sorting concentration is lower than that of flotation, it can also play a de-drug effect, providing favorable conditions for subsequent activation and zinc recovery. Finally, the tailings separated by the shaking table are subjected to the zinc flotation process to achieve efficient recovery of zinc.

[0071] From the recovery results, it can be seen that the recovery effects of gold, silver, lead and zinc are good. Among them, the grades of gold, silver and lead in lead concentrate are greatly improved, and the recovery rates of gold, silver and lead are all above 70%, and the recovery rate of zinc in zinc concentrate is above 86%. It can be explained that the ore dressing system for complex gold-silver mixed lead-zinc polymetallic ore proposed by the utility model has strong practicality for the separation of complex gold-silver mixed lead-zinc polymetallic ore.

[0072] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above, and any modifications, equivalent substitutions, 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 complex gold-silver mixed lead-zinc polymetallic ore, characterized in that: It comprises a first-stage mill (101), wherein the discharge port of the first-stage mill (101) is connected to the feed port of a spiral classifier (2), the sand settling discharge port of the spiral classifier (2) is connected to the feed port of the first-stage mill (101), and the overflow discharge port of the spiral classifier (2) is connected to the feed port of a first-stage mill (101); The discharge port of the 1# stirring barrel (301) is connected to the feed port of the 2# stirring barrel (302), the discharge port of the 2# stirring barrel (302) is connected to the feed pipe of the lead rougher (401), the concentrate port of the lead rougher (401) is connected to the feed pipe of the lead concentrator (402) through the 1# pump pool (501) and the 1# pump (502), and the lead concentrator (402) is connected to the lead concentrator (403) and the lead concentrator (404) in sequence; The tailings pipe of the lead rougher 1 (401) is connected to the feed port of the hydrocyclone (6) through the 2# pump pool (503) and the 2# pump (504); the sand settling port of the hydrocyclone (6) is connected to the feed port of the second-stage mill (102); the discharge port of the second-stage mill (102) is connected to the feed port of the hydrocyclone (6); and the overflow port of the hydrocyclone (6) is connected to the feed port of the 3# mixing barrel (303); The discharge port of the 3# stirring barrel (303) is connected to the feed port of the 4# stirring barrel (304), the discharge port of the 4# stirring barrel (304) is connected to the feed pipe of the second lead rougher (405), the second lead rougher (405) is connected to the lead scavenger (406), the concentrate port of the second lead rougher (405) is connected to the feed pipe of the first lead concentrator (402) through the 1# pump pool (501) and the 1# pump (502), and the tailings pipe of the lead scavenger (406) is connected to the feed port of the 5# stirring barrel (305); The discharge port of the 5# stirring barrel (305) is connected to the feed chute of the shaking table gravity separator (7), and the tailings side of the shaking table gravity separator (7) is connected to the feed port of the 6# stirring barrel (306); The discharge port of the 6# stirring barrel (306) is connected to the feed port of the 7# stirring barrel (307), the discharge port of the 7# stirring barrel (307) is connected to the feed pipe of the zinc rougher (801), the tailings pipe of the zinc rougher (801) is connected to the zinc scavenger 1 (802) and the zinc scavenger 2 (803) in sequence, and the concentrate port of the zinc rougher (801) is connected to the zinc concentrator 1 (804), the zinc concentrator 2 (805) and the zinc concentrator 3 (806) in sequence.

2. The ore dressing system for complex gold-silver mixed lead-zinc polymetallic ore according to claim 1 is characterized in that: The tailings pipe of the lead concentrator three (404) is connected to the feed pipe of the lead concentrator two (403), and the tailings pipe of the lead concentrator two (403) is connected to the feed pipe of the lead concentrator one (402), so that a circulation loop is formed between the lead concentrator three (404) and the lead concentrator two (403) and between the lead concentrator two (403) and the lead concentrator one (402).

3. The ore dressing system for complex gold-silver mixed lead-zinc polymetallic ore according to claim 1 is characterized in that: The tailing pipe of the lead scavenger (406) is connected to the feed pipe of the lead rougher (401), so that a circulation loop is formed between the lead scavenger (406) and the lead rougher (401).

4. The ore dressing system for a complex gold-silver mixed lead-zinc polymetallic ore according to claim 1 is characterized in that: The tailings pipe of the zinc scavenger 2 (803) is connected to the ore feeding pipe of the zinc scavenger 1 (802), and the tailings pipe of the zinc scavenger 1 (802) is connected to the ore feeding pipe of the zinc rougher (801), so that a circulation loop is formed between the zinc scavenger 2 (803) and the zinc scavenger 1 (802), and between the zinc scavenger 1 (802) and the zinc rougher (801).

5. The ore dressing system for complex gold-silver mixed lead-zinc polymetallic ore according to claim 1 is characterized in that: The tailings pipe of the zinc concentrator three (806) is connected to the ore feeding pipe of the zinc concentrator two (805), the tailings pipe of the zinc concentrator two (805) is connected to the ore feeding pipe of the zinc concentrator one (804), and the tailings pipe of the zinc concentrator one (804) is connected to the ore feeding pipe of the zinc rougher (801), so that a circulation loop is formed between the zinc concentrator three (806) and the zinc concentrator two (805), the zinc concentrator two (805) and the zinc concentrator one (804), and the zinc concentrator one (804) and the zinc rougher (801).

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