Comprehensive recovery method of low-grade polymetallic ore pre-discarding-gravity flotation combination

Abstract

The invention provides a low-grade polymetallic ore tailing pre-discarding-gravity flotation combined comprehensive recovery method which comprises the following steps: crushing and screening raw ore to obtain oversize products and undersize products, and carrying out coarse grain gravity separation and tailing discarding on the oversize products to obtain coarse grain heavy minerals and coarse grain light minerals; the coarse-grain heavy minerals and the screen underflow are combined and then are ground, and a ground product is obtained; fine grain gravity separation is conducted on the ore grinding product, fine grain heavy minerals and fine grain light minerals are obtained, gold-lead-zinc mixed rough flotation is conducted on the fine grain light minerals, and mixed rough concentrate is obtained; the mixed rough concentrate is subjected to gold-lead flotation, and gold-lead bulk concentrate and floating lead tailings are obtained; the fine-grain heavy minerals and the gold-lead bulk concentrates are combined for gold-lead separation flotation, and lead concentrates and gold concentrates 1 are obtained; and the floating lead tailings are subjected to gold-zinc separation flotation, and zinc concentrate and gold concentrate 2 are obtained. The volume or quantity of equipment required by each rough separation section is reduced by 20-50%, the ore separation process is shortened, and the cost is saved; and gold concentrate 2 is recycled in the zinc flotation process, so that the loss of gold is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, in particular to a comprehensive recovery method of low-grade polymetallic ores by combining pre-discarding tailings with re-floating. Background Art

[0002] The mineral processing and recovery of polymetallic sulfide ores such as gold, lead and zinc are mainly based on flotation. The flotation process can be summarized as direct priority flotation process, partial mixed flotation process, full mixed flotation-coarse concentrate re-separation process and equal floatability process formulated according to the difference in the floatability of minerals and the order of their natural floatability.

[0003] Compared to other processes, the mixed flotation-rougher concentrate re-separation process boasts a relatively short roughing section and smaller equipment volume in the concentrating section, resulting in lower initial investment and production costs. However, the separation of gold, lead, and zinc from the rougher concentrate presents challenges such as complex concentrating processes, and incomplete separation due to strong suppression or capture of gold and zinc, which can easily lead to zinc or gold losses. Furthermore, some polymetallic ores with low gold, lead, and zinc content have high processing costs and low profits, making them difficult to utilize economically and efficiently.

[0004] Chinese patent document CN117483098A discloses a method for beneficiation and separation of gold ores containing lead and zinc sulfides. If this method is used for polymetallic ores with low gold, lead, and zinc contents (e.g., gold content ≤1.5 g / t) and high waste rock or gangue contents, the following problems are likely to occur: 1. To achieve the set beneficiation targets in each roughing section of flotation, a large amount of roughing equipment is required, resulting in a long beneficiation process in each roughing section, low efficiency, and high beneficiation costs; 2. Gold-containing minerals with poor flotation performance in the gold-lead flotation section are not fully recovered and are easily lost in the zinc concentrate or tailings. Summary of the Invention

[0005] The present invention proposes a comprehensive recovery method for low-grade polymetallic ores by combining pre-discarding tailings with re-floatation. The volume or quantity of equipment required for each roughing stage in flotation is reduced by 20-50%, shortening the beneficiation process of each roughing stage in actual production, saving costs and improving efficiency. At the same time, gold concentrate 2 is recovered during the zinc flotation process, reducing gold losses.

[0006] The technical solution of the present invention is achieved as follows: a comprehensive recovery method for low-grade polymetallic ores by pre-disposal tailings-refloatation, comprising the following steps:

[0007] (1) The raw ore is crushed and screened to obtain oversize and undersize. The oversize is subjected to coarse-grained gravity separation and discarded to obtain coarse-grained heavy minerals and coarse-grained light minerals. The coarse-grained light minerals are tailings 1;

[0008] (2) The coarse-grained heavy minerals and the undersize are combined and ground to obtain a ground product, wherein the particle size of the ground product is -0.074 mm and the proportion is between 40% and 90%;

[0009] (3) The grinding products are subjected to fine-grained gravity separation to obtain fine-grained heavy minerals and fine-grained light minerals, with the proportion of fine-grained heavy minerals controlled at 0.5%-5% of the feed;

[0010] (4) fine-grained light minerals are subjected to mixed coarse flotation of gold, lead, and zinc to obtain mixed coarse concentrate and tailings 2;

[0011] (5) mixing the coarse concentrate to carry out gold-lead flotation to obtain a gold-lead mixed concentrate and floating lead tailings;

[0012] (6) After the fine-grained heavy minerals and the gold-lead mixed concentrate are combined, gold-lead separation flotation is performed to obtain lead concentrate and gold concentrate 1;

[0013] (7) The lead tailings are subjected to gold and zinc separation flotation to obtain zinc concentrate and gold concentrate 2.

[0014] Furthermore, in step (1), the gold content in the raw ore is ≤1.5g / t, the raw ore is crushed to a particle size of less than 20mm, and the screening particle size is 5mm-20mm.

[0015] Furthermore, in step (1), the equipment for discarding the coarse particles by gravity separation is a jig or a heavy medium cyclone, and the separation density is 2.5-3.0 g / cm3.

[0016] Furthermore, in step (2), a rod mill or a ball mill is used for grinding, and the particle size of the grinding product is -0.074 mm, accounting for 50%-80%.

[0017] Furthermore, in step (3), the equipment for fine particle gravity separation is a Nielsen centrifuge, a Falcon centrifuge, a centrifugal concentrator, a spiral process or a shaking table. The specific gravity separation equipment used depends on the fineness of the ground product. For coarse particle size, a Nielsen centrifuge, a Falcon centrifuge, etc. are preferred; for fine particle size, a centrifugal concentrator, a shaking table, etc. are preferred.

[0018] Furthermore, in step (4), the gold, lead and zinc mixed rough flotation includes two roughing operations, wherein a collector and a frother are added in the first roughing operation to obtain a first roughing foam and a first bottom product, and a collector and a frother are added to the first bottom product to obtain a second roughing foam and a roughing bottom product, and the first and second roughing foams are combined to carry out 1-2 blank selections to obtain a mixed rough concentrate, and a collector and a frother are added to the roughing bottom product to carry out 1-2 scavenging operations to obtain a scavenging foam product and a scavenging bottom product, and the scavenging bottom product is tailings 2.

[0019] Furthermore, in step (4), during the gold, lead and zinc mixed rough flotation process, 20-100 g / t of collector and 5-30 g / t of frother are added in the first roughing; the collector is a combination of two or more of amyl xanthate, ethylthiocyanate, butyl ammonium black medicine, and No. 25 black medicine; the frother is MIBC or pine oil; and the amount of reagent used in the second roughing and scavenging section is n times the amount used in the roughing section, where n≤1 / 2.

[0020] Furthermore, in step (5), the gold-lead flotation includes one roughing, in which a zinc inhibitor is added to obtain a roughing foam product and a roughing tailing, the roughing foam product is a gold-lead mixed rough concentrate, the gold-lead mixed rough concentrate is subjected to a second round of cleaning with the addition of a zinc inhibitor to obtain a gold-lead mixed concentrate; the roughing tailing is subjected to one or two scavengings with the addition of a collector, the scavenging foam product is sequentially returned as a middling, and the scavenging tank bottom product is a floating lead tailing.

[0021] Furthermore, in step (5), during the gold-lead flotation process, the zinc inhibitor dosage is 100 g / t-2000 g / t, and the collector dosage is 5-50 g / t; the zinc inhibitor is at least two of sodium sulfite, sodium carbonate, lime, and zinc sulfate, and the collector is one or more of ethylthiocyanate, xanthate, butylammonium black medicine, and No. 25 black medicine.

[0022] Furthermore, in step (6), the gold-lead separation flotation includes one roughing, in which an inhibitor is added to obtain a roughing foam product and a roughing bottom product, and the roughing foam product is subjected to two rounds of cleaning to obtain a lead concentrate; the roughing bottom product is subjected to one scavenging by adding a collector, and the scavenged foam product is returned in sequence as a middling, and the scavenged bottom product is a gold concentrate 1.

[0023] Furthermore, in step (6), during the gold-lead separation and flotation process, the amount of inhibitor used is 10-500 g / t, and the amount of collector used is 5-50 g / t; the inhibitor is one or more of lime, sodium humate, and sodium hypochlorite, and the collector is one or more of ethylthiocarb, ethyl xanthate, and No. 25 black medicine.

[0024] Furthermore, in step (7), the gold-zinc separation flotation includes one roughing, in which a sulfur inhibitor, a zinc activator and a collector are added to obtain a roughing foam product and a roughing bottom product, the roughing foam product is used as a zinc rough concentrate, a sulfur inhibitor is added to the zinc rough concentrate for one cleaning to obtain a zinc concentrate, a collector is added to the roughing bottom product and then subjected to one scavenging, the scavenged foam is sequentially returned as a middling, and the scavenged bottom product is a gold concentrate 2.

[0025] Furthermore, in step (7), during the gold-zinc separation and flotation process, the amount of the sulfur depressant is 50-200 g / t, the amount of the zinc activator is 20-500 g / t, the amount of the collector is 2-50 g / t, and the amount of the frother is 1-10 g / t; the sulfur depressant is one or more of lime, sodium humate, and sodium hypochlorite, the zinc activator is sulfuric acid, copper sulfate, or ferrous sulfate, and the collector is butyl xanthate or amyl xanthate.

[0026] Beneficial effects of the present invention:

[0027] The present invention uses a coarse-grain gravity separation method to perform preliminary separation of lead, gold, and zinc ore before flotation, as well as early discarding of waste rock and gangue. Compared with the direct grinding-gravity separation method in the prior art, the present invention reduces the number or volume of equipment required in each roughing stage in subsequent flotation by 20-50%, shortening the beneficiation process of each roughing stage in actual production, saving costs and improving efficiency. The gold, lead, and zinc mixed rough flotation uses two roughing stages to further improve the gold recovery efficiency in the roughing stage. At the same time, compared with the conventional mixed flotation-rough concentrate re-separation process, this method improves the gold and lead beneficiation recovery efficiency before zinc flotation. During the zinc flotation process, gold concentrate 2 is also recovered, and the loss of gold in the zinc concentrate is relatively small. By combining the above steps, the types and amounts of flotation reagents can also be reduced.

[0028] The present invention discards part of the gangue or waste rock before ore grinding, thereby reducing the processing capacity requirements of the subsequent grinding and flotation system and improving the selected grade. Secondly, after grinding, gravity separation is used to enrich part of the natural gold and gold-bearing minerals such as coarse lead minerals with a high degree of dissociation and pyrite in advance, so as to avoid them directly entering the subsequent flotation system and being lost in the tailings.

[0029] Compared with other coarse concentrate separation processes, the present invention adopts a zinc inhibitor to preferentially enrich lead and gold-bearing minerals with good floatability during the coarse concentrate re-separation process, thereby avoiding the loss of gold in the zinc concentrate due to the difficulty in inhibiting gold in the subsequent zinc-gold separation process.

[0030] The lead-gold mixed concentrate obtained by flotation is mixed with the gold-lead mixed ore obtained by fine-grained gravity separation to separate lead and gold. Compared with the conventional mixed lead-gold separation stage, the present invention has a much lower reagent content in the overall collector due to the mixing of the coarse gravity concentrate in this stage, which facilitates the separation of the two.

[0031] After the final flotation of the coarse concentrate lead and some highly floatable gold-bearing minerals, the remaining zinc-containing minerals such as sphalerite and gold-bearing minerals with poor flotation performance are then floated out of the zinc concentrate using a method that inhibits gold and activates the floating zinc ore. The final tailings are again another gold concentrate product. This patent separates the gold concentrate into two products during the coarse concentrate separation stage, which can minimize the loss of gold and gold-bearing minerals caused by strong inhibition or capture during the multi-metal separation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 The figure is a schematic diagram of the mineral processing flow of the comprehensive recovery method of the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0035] The dosage of the reagent g / t in the present invention is the amount of reagent added per ton of ground ore product.

[0036] Example 1

[0037] A gold-lead-zinc polymetallic ore contains 1.42g / t gold, 0.74% Pb, and 0.81% Zn. Its main metal minerals are pyrite, galena, and sphalerite. The gangue is mainly quartz, potassium feldspar, sodium feldspar, and pyroxene, with a small amount of kaolinite and mica.

[0038] like Figure 1 As shown, a comprehensive recovery method for low-grade polymetallic ores by pre-disposal and re-floating, comprising the following steps:

[0039] (1) The raw ore is crushed by a crusher and screened to a particle size of less than 20 mm; the crushed sample is screened by a vibrating screen to a particle size of 1 mm to obtain an oversize with a particle size greater than 1 mm and an undersize with a particle size less than 1 mm;

[0040] The oversize material is subjected to coarse-grained gravity separation and tailings removal using a heavy medium cyclone with a separation density of 2.8 g / cm3, and is separated into coarse-grained heavy minerals and coarse-grained light minerals, wherein the coarse-grained light minerals are tailings 1, and tailings 1 are coarse-grained tailings or waste rock;

[0041] (2) After the coarse-grained heavy minerals and the undersize are combined, the ore is ground into -0.074 mm in a ball mill, accounting for 70%, to obtain a ground product;

[0042] (3) Using a Nielsen centrifuge to separate the ground products into fine-grained heavy minerals and fine-grained light minerals, with the proportion of fine-grained heavy minerals controlled at 0.8% of the feed;

[0043] (4) Fine-grained light minerals are subjected to mixed rough flotation of gold, lead and zinc. The mixed rough flotation of gold, lead and zinc includes two roughing operations. In the first roughing operation, 50 g / t of ethyl thiocyanate, 20 g / t of amyl xanthate and 20 g / t of MIBC are added to obtain the first roughing foam and the first bottom product. In the second roughing operation, 25 g / t of ethyl thiocyanate, 10 g / t of amyl xanthate and 10 g / t of MIBC are added to obtain the second roughing foam and the roughing tank product. The two roughing foams are combined and blank selected twice to obtain a mixed rough concentrate. 20 g / t of ethyl thiocyanate, 10 g / t of amyl xanthate and 10 g / t of MIBC are added to the bottom product of the roughing tank to perform two scavenging operations. The foam of the first scavenging operation is returned to the front of the first roughing operation. The foam product of the second scavenging operation is returned to the front of the first scavenging operation as the middling ore. The bottom product of the scavenging operation is tailings 2.

[0044] (5) gold-lead flotation is performed on the gold-lead-zinc mixed rough concentrate. The gold-lead flotation includes one roughing process. In the roughing process, 200 g / t of sodium sulfite and 200 g / t of zinc sulfate are added as zinc inhibitors to obtain a roughing foam product and a roughing tailing. The roughing foam product is a gold-lead mixed rough concentrate. The gold-lead mixed rough concentrate is then subjected to a second round of fine separation by adding 50 g / t of sodium sulfite and 50 g / t of zinc sulfate to obtain a gold-lead mixed rough concentrate. 5 g / t of ethyl dithiocarbamate is added to the roughing tailing as a collector to perform a gold-lead scavenging process. The scavenging foam product is returned as middlings in sequence, and the scavenging tank bottom product is a floating lead tailing that enters the zinc separation operation.

[0045] (6) After the fine-grained heavy minerals and the gold-lead mixed concentrate are combined, gold-lead separation flotation is carried out. The gold-lead separation flotation includes one roughing process. In the roughing process, 100 g / t of lime is added as a sulfur inhibitor to obtain a roughing foam product and a roughing bottom product. The roughing foam product is subjected to two rounds of cleaning to obtain a lead concentrate. The roughing bottom product is subjected to one scavenging process by adding 5 g / t of ethyl thiocyanate. The scavenged foam product is returned to the previous level, and the scavenged bottom product is the gold concentrate 1.

[0046] (7) Gold and zinc separation flotation is performed on the floating lead tailings. The gold and zinc separation flotation includes one roughing process. In the roughing process, 100 g / t of lime is added as a sulfur depressant, 40 g / t of copper sulfate is added as a zinc activator, 5 g / t of butyl xanthate is added as a collector, and 1 g / t of MIBC is added to obtain a roughing foam product and a roughing bottom product. The roughing foam product is added with 50 g / t of lime for one fine selection to obtain zinc concentrate, and the fined middlings are returned in sequence; 1 g / t of butyl xanthate and 1 g / t of MIBC are added to the roughing bottom product for one scavenging process. The scavenging foam product is returned in sequence to the previous level, and the scavenging bottom product is gold concentrate 2.

[0047] The beneficiation results of Example 1

[0048]

[0049] Comparative Example 1

[0050] The original ore is the same as that in Example 1, and the gold, lead and zinc are comprehensively recovered by conventional mixed flotation-flotation separation method. The specific steps are as follows:

[0051] (1) crushing the raw ore with a crusher and screening the ore to a particle size of less than 2 mm to obtain a crushed product; grinding the crushed product with a ball mill to a particle size of -0.074 mm, accounting for 70%, to obtain a ground product;

[0052] (2) Add 70 g / t of ethyl thiocyanate, 50 g / t of amyl xanthate and 30 g / t of MIBC to the milled product for mixed flotation of gold, lead and zinc. Perform one roughing separation and two blank separations. Add 35 g / t of ethyl thiocyanate, 25 g / t of amyl xanthate and 10 g / t of MIBC for four scavenging separations. The middlings are returned in sequence to obtain mixed coarse concentrates of gold, lead and zinc and flotation tailings.

[0053] (3) adding 1000 g / t of lime and 500 g / t of zinc sulfate as zinc-sulfur inhibitors to the gold-lead-zinc mixed coarse concentrate, performing a roughing process of lead flotation to obtain a roughing foam product and a roughing tailing. The roughing foam product is used as a lead coarse concentrate, and 500 g / t of lime and 250 g / t of zinc sulfate are added to perform a second round of concentration to obtain a lead concentrate;

[0054] Add 100g / t of lime, 250g / t of zinc sulfate as a zinc inhibitor, 20g / t of ethyl dithiocarbamate, and 10g / t of MIBC as a collector and frother to the rougher tailings, and perform two lead scavenging operations. The scavenging foam product is returned to the previous level as the middlings, and the product in the scavenging tank is sent to the zinc separation process.

[0055] (4) Add 100 g / t of lime as a sulfur depressant, 40 g / t of copper sulfate as a zinc activator, 30 g / t of butyl xanthate as a zinc collector, and 10 g / t of MIBC to the product in the scavenging tank in step (3), and perform roughing of zinc flotation to obtain roughing foam and roughing tailings. Add 200 g / t of lime to the roughing foam and perform a second round of cleaning to obtain zinc concentrate, and the cleaned middlings are returned in sequence; add 10 g / t of butyl xanthate and 2 g / t of MIBC to the roughing tailings and perform a second round of scavenging. The scavenging foam products are returned in sequence to the previous level, and the product at the bottom of the scavenging tank is gold concentrate.

[0056] The beneficiation results of comparative example 1

[0057]

[0058] 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 scope of protection of the present invention.

Claims

1. A comprehensive recovery method for low-grade polymetallic ores by combining pre-disposal and refloatation, characterized in that: The following steps are involved: (1) The raw ore is crushed and screened to obtain oversize and undersize. The oversize is subjected to coarse-grained gravity separation and discarded to obtain coarse-grained heavy minerals and coarse-grained light minerals. The coarse-grained light minerals are tailings 1; (2) The coarse-grained heavy minerals and the undersize are combined and ground to obtain a ground product, wherein the particle size of the ground product is -0.074 mm and the proportion is between 40% and 90%; (3) The grinding products are subjected to fine-grained gravity separation to obtain fine-grained heavy minerals and fine-grained light minerals, with the proportion of fine-grained heavy minerals controlled at 0.5%-5% of the feed; (4) fine-grained light minerals are subjected to mixed coarse flotation of gold, lead, and zinc to obtain mixed coarse concentrate and tailings 2; (5) mixing the coarse concentrate to carry out gold-lead flotation to obtain a gold-lead mixed concentrate and floating lead tailings; (6) After the fine-grained heavy minerals and the gold-lead mixed concentrate are combined, gold-lead separation flotation is performed to obtain lead concentrate and gold concentrate 1; (7) The lead tailings are subjected to gold and zinc separation flotation to obtain zinc concentrate and gold concentrate 2.

2. The comprehensive recovery method according to claim 1, characterized in that: In step (1), the gold content in the raw ore is ≤1.5g / t, the raw ore is crushed to a particle size of less than 20mm, and the screening particle size is 5mm-20mm; the equipment for coarse particle gravity separation and tailing is a jig or a heavy medium cyclone, and the separation density is 2.5-3.0g / cm3.

3. The comprehensive recovery method according to claim 1, characterized in that: In step (4), the gold, lead and zinc mixed rough flotation includes two roughing operations. The bottom minerals from the first roughing operation are subjected to the second roughing operation to obtain the roughing bottom product. The two roughing foams are combined to perform 1-2 blank selection operations to obtain a mixed rough concentrate. The roughing bottom product is subjected to 1-2 scavenging operations, and the scavenging bottom product is tailings 2.

4. The comprehensive recovery method according to claim 3, characterized in that: In step (4), during the gold, lead and zinc mixed rough flotation, 20-100 g / t of collector and 5-30 g / t of frother are added in the first roughing; the collector is a combination of two or more of amyl xanthate, ethylthiocyanate, butyl ammonium black medicine, and No. 25 black medicine; the frother is MIBC or pine oil; the amount of reagent used in the second roughing and scavenging section is n times the amount used in the first roughing section, and n≤1 / 2.

5. The comprehensive recovery method according to claim 1, characterized in that: In step (5), the gold-lead flotation includes one roughing, in which a zinc inhibitor is added to obtain a roughing foam product and a roughing tailing, wherein the roughing foam product is a gold-lead mixed rough concentrate, and the gold-lead mixed rough concentrate is subjected to a second round of cleaning by adding a zinc inhibitor to obtain a gold-lead mixed concentrate; the roughing tailing is subjected to one or two scavenging by adding a collector, and the scavenging foam product is sequentially returned as a middling, and the scavenging tank bottom product is a floating lead tailing.

6. The comprehensive recovery method according to claim 5, characterized in that: In step (5), during the gold-lead flotation process, the zinc inhibitor dosage is 100 g / t-2000 g / t, and the collector dosage is 5-50 g / t; the zinc inhibitor is at least two of sodium sulfite, sodium carbonate, lime, and zinc sulfate, and the collector is one or more of ethylthiocyanate, xanthate, butylammonium black medicine, and No. 25 black medicine.

7. The comprehensive recovery method according to claim 1, characterized in that: In step (6), the gold-lead separation flotation includes one roughing, in which an inhibitor is added to obtain a roughing foam product and a roughing bottom product, and the roughing foam product is subjected to two rounds of cleaning to obtain a lead concentrate; the roughing bottom product is subjected to one scavenging by adding a collector, and the scavenged foam product is returned as a middling in sequence, and the scavenged bottom product is a gold concentrate 1.

8. The comprehensive recovery method according to claim 7, characterized in that: In step (6), during the gold-lead separation and flotation process, the amount of inhibitor used is 10-500 g / t, and the amount of collector used is 5-50 g / t; the inhibitor is one or more of lime, sodium humate, and sodium hypochlorite, and the collector is one or more of ethyl thiocyanate, ethyl xanthate, and No. 25 black medicine.

9. The comprehensive recovery method according to claim 1, characterized in that: In step (7), the gold-zinc separation flotation includes one roughing, in which a sulfur inhibitor, a zinc activator and a collector are added to obtain a roughing foam product and a roughing bottom product. The roughing foam product is used as a zinc rough concentrate. A sulfur inhibitor is added to the zinc rough concentrate for one cleaning to obtain a zinc concentrate. The roughing bottom product is added with a collector and then subjected to a scavenging. The scavenged foam is sequentially returned as a middling, and the scavenged bottom product is a gold concentrate 2.

10. The comprehensive recovery method according to claim 9, characterized in that: In step (7), during the gold-zinc separation flotation process, the amount of the sulfur depressant is 50-200 g / t, the amount of the zinc activator is 20-500 g / t, the amount of the collector is 2-50 g / t, and the amount of the frother is 1-10 g / t; the sulfur depressant is one or more of lime, sodium humate, and sodium hypochlorite, the zinc activator is sulfuric acid, copper sulfate, or ferrous sulfate, and the collector is butyl xanthate or amyl xanthate.

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