Beneficiation method for flotation recovery of high-silver tetrahedrite and application of beneficiation method

Abstract

The invention particularly relates to a beneficiation method for flotation recovery of high-silver tetrahedrite and application of the beneficiation method. The beneficiation method comprises the steps that raw ore is ground, a collecting agent 1 is added, and then settled sand and overflow are obtained through classification of a hydrocyclone; settled sand enters a flotation machine to obtain flotation concentrate 1 and tailings 1 returned to an ore grinding system; the overflow enters a flotation machine to obtain flotation concentrate 2 and tailings 2, and the flotation concentrate 1 and the flotation concentrate 2 are combined into copper-silver concentrate 1; adding a collecting agent 2 into the flotation tailings 2, and carrying out mixed flotation roughing and scavenging to obtain mixed flotation concentrates (mixed flotation roughing and scavenging concentrates are combined) and total tailings; and concentrated underflow and overflow are obtained after the mixed flotation concentrate is subjected to reagent removal, the underflow is subjected to ore grinding and grading, a regulator 1 and a collecting agent 1 are added to graded products for flotation roughing, copper-silver concentrate 2 and tailings of all stages are obtained through three times of concentration, scavenged concentrate (returning roughing) and lead-antimony concentrate are obtained after the roughed tailings are scavenged, and the rest concentrated tailings are returned to the previous stage of concentration. According to the method, the silver-copper-lead-antimony concentrate product in the high-silver tetrahedrite is recycled, and efficient utilization of resources is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of mineral processing, and particularly relates to a beneficiation method for flotation recovery of high-silver tetrahedrite and its application. Background Art

[0002] Tetrahedrite is an important copper ore mineral and also an important silver ore mineral. In tetrahedrite, copper elements are replaced by other elements. When the content of the replacement elements reaches a certain level, new mineral species will be formed, such as silver tetrahedrite, arsenical tetrahedrite, black tetrahedrite, etc. At the same time, with different replacement elements, the properties of the ore will also change. Taking silver tetrahedrite as an example, its silver content is generally above 10%, its silver value far exceeds the copper value, and its silver pricing coefficient is also high, making it an important mineral of silver.

[0003] At present, more research has been done on arsenical tetrahedrite. The arsenic content in arsenical tetrahedrite is as high as about 20%. Although it contains about 50% copper, arsenic is harmful to copper smelting. Therefore, it is generally inhibited or removed as an impurity mineral. For example, Chinese patent document CN111195563A provides a preparation method and application method of an inhibitor for separating arsenical tetrahedrite from chalcopyrite, introducing the preparation method of an improved inhibitor for arsenical tetrahedrite, and realizing the inhibition of arsenical tetrahedrite through an efficient inhibitor. As a high-value silver-copper mineral, if high-grade concentrate products can be obtained from silver tetrahedrite, not only will the recovery rates of copper and silver be increased, but also the copper-silver pricing coefficients will be greatly increased. However, in actual production, silver tetrahedrite often coexists with minerals such as lead and antimony. At present, only copper-lead-antimony mixed concentrates can be obtained at the site. Due to the high silver content, which can reach 3000 g / t, even if the lead-antimony impurity content is relatively high, it can still be sold as silver-copper concentrate, but the discount coefficient is relatively high. The site has also tried to separate and recover the mixed concentrates, but the effect is not good. There is a lot of lead and antimony in the copper-silver concentrate, and the increase in the grades of copper and silver is limited, with an obvious loss in recovery rate; while the silver occupancy rate in the lead-antimony concentrate is relatively high, which instead leads to a decrease in the value of the concentrate. Therefore, the site usually chooses not to separate the mixed concentrates but directly sell and process them. This treatment method not only damages the benefits of the concentrator but also causes waste of resources such as lead and antimony. Therefore, in order to efficiently develop and utilize such resources and maximize the benefits of silver, copper, lead, and antimony in them to the greatest extent, a beneficiation method for flotation recovery of high-silver tetrahedrite is developed, aiming to provide an efficient method for the development of similar resources. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art and solving the technical problems such as the low recovery rate and grade of silver tetrahedrite in the prior art, the difficulty in separating mixed concentrates, and the low resource utilization rate, the present invention aims to provide a beneficiation method for flotation recovery of high-silver tetrahedrite and its application. By using the beneficiation method provided by the present invention, high-value silver-copper concentrates with a silver grade > 6000 g / t and a copper grade > 20% can be obtained.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The first object of the present invention is to provide a beneficiation method for the flotation recovery of high-silver tetrahedrite, comprising the following steps:

[0007] S1. Grinding the raw ore and adding collector 1. The ground product is classified by a hydrocyclone to obtain hydrocyclone underflow and hydrocyclone overflow.

[0008] S2. Feeding the hydrocyclone underflow obtained in S1 into a flotation machine for separation to obtain flotation concentrate 1 and flotation tailings 1. The obtained flotation tailings 1 are returned to the grinding system.

[0009] S3. Feeding the hydrocyclone overflow obtained in S1 into a flotation machine for separation to obtain flotation concentrate 2 and flotation tailings 2. Among them, flotation concentrate 2 and flotation concentrate 1 obtained in S2 are combined into copper-silver concentrate 1.

[0010] S4. Adding collector 2 to the flotation tailings 2 obtained in S3 for bulk flotation roughing operation to obtain bulk flotation rough concentrate and bulk flotation rough tailings. Adding collector 2 to the bulk flotation rough tailings for bulk flotation scavenging operation to obtain bulk flotation scavenging concentrate and bulk flotation scavenging tailings. Among them, the bulk flotation scavenging concentrate and the bulk flotation rough concentrate are combined into bulk flotation concentrate, and the bulk flotation scavenging tailings are the total tailings.

[0011] S5. Adding a depressant to the bulk flotation concentrate obtained in S4 for de-dosing and thickening to obtain thickened underflow and thickened overflow.

[0012] S6. Feeding the thickened underflow obtained in S5 into a grinding and classification system composed of a mill and a hydrocyclone for grinding and hydrocyclone classification to obtain hydrocyclone classification products.

[0013] S7. Adding regulator 1 and collector 1 to the hydrocyclone classification products for flotation roughing operation to obtain roughing concentrate and roughing tailings. Adding regulator 1 to the roughing concentrate for cleaning 1 operation to obtain cleaning 1 concentrate and cleaning 1 tailings. Adding regulator 1 to the cleaning 1 concentrate for cleaning 2 operation to obtain cleaning 2 concentrate and cleaning 2 tailings. Adding regulator 1 to the cleaning 2 concentrate for cleaning 3 operation to obtain copper-silver concentrate 2 and cleaning 3 tailings. Adding collector 1 to the roughing tailings for scavenging operation to obtain scavenging concentrate and lead-antimony concentrate. Among them, the scavenging concentrate is returned to the flotation roughing operation, and the remaining cleaning tailings are returned to the previous stage of cleaning. The remaining cleaning tailings include cleaning 1 tailings, cleaning 2 tailings and cleaning 3 tailings.

[0014] Preferably, in step S1, the fineness in the grinding operation is that the mass of particles with a particle size less than 0.074 mm accounts for 45-55% of the total particle mass; the fineness of the hydrocyclone overflow with a particle size less than 0.074 mm accounts for 60-70% of the total particle mass; the dosage of collector 1 is 40-80 g / t.

[0015] Preferably, the dosage of collector 2 in the bulk flotation roughing operation in step S4 is 40-80 g / t; the dosage of collector 2 in the bulk flotation scavenging operation is 10-20 g / t.

[0016] Preferably, the depressant in step S5 is sodium sulfide, and its dosage is 500-1000 g / t.

[0017] Preferably, in the hydrocyclone classification product in step S6, the mass of particles with a fineness less than 0.074 mm accounts for 85-95% of the total particle mass.

[0018] Preferably, in the flotation roughing operation in step S7, the dosage of regulator 1 is 400-600 g / t, and the dosage of the collector is 40-60 g / t;

[0019] The dosage of regulator 1 in the first cleaning operation is 200-300 g / t;

[0020] The dosage of regulator 1 in the second cleaning operation is 100-200 g / t;

[0021] The dosage of regulator 1 in the third cleaning operation is 50-100 g / t;

[0022] The dosage of collector 1 in the scavenging operation is 5-15 g / t.

[0023] Preferably, collector 1 is prepared from aniline black medicine and disodium ethylenediaminetetraacetate in a mass ratio of (2-4):1.

[0024] Preferably, collector 2 is prepared from aniline black medicine, ethyl thionocarbamate and imidazole mercaptan in a mass ratio of 1:(1-2):(4-6).

[0025] Preferably, regulator 1 is prepared from sodium humate, ammonium persulfate and sodium dichromate in a mass ratio of 1:(2-4):(1-2).

[0026] The second object of the present invention is to provide the application of the above-mentioned ore dressing method in the ore dressing of copper-silver-lead-antimony polymetallic sulfide ore, which is characterized in that the ore dressing of copper-silver-lead-antimony polymetallic sulfide ore includes tetrahedrite containing silver, chalcopyrite, galena, jamesonite and pyrite.

[0027] The principle and design idea of the present invention:

[0028] The beneficiation method for the flotation recovery of tetrahedrite with high silver content provided by the present invention can be applied to copper-silver-lead-antimony polymetallic sulfide ores containing tetrahedrite with silver, chalcopyrite, galena, jamesonite, pyrite, etc. Taking tetrahedrite with silver as an example, due to its specific mineral surface properties, such as sensitive reaction to flotation reagents and the presence of easily oxidized elements in its chemical composition, and the possible crystal structure defects generated during the formation process, tetrahedrite with silver has characteristics such as good floatability and easy oxidation of the dissociation surface. First, the present invention utilizes the characteristics of good floatability and easy oxidation of the dissociation surface of tetrahedrite with silver, and adds a high-efficiency collector 1 complexed with copper and silver during the grinding operation to recover the dissociated tetrahedrite with silver through flash flotation. This is mainly because the high-efficiency collector 1 complexed with copper and silver can quickly complex with copper and silver on the surface of freshly generated tetrahedrite with silver, avoiding the reduction of the reagent complexing force caused by surface oxidation, making the floatability difference between tetrahedrite with silver and the lead-antimony surface larger, and enabling tetrahedrite with silver to float quickly without returning to the grinding process to cause continuous oxidation of the fresh dissociation surface. This problem can be avoided by adopting flash flotation for the overflow and sand products.

[0029] Secondly, for tetrahedrite with silver that has insufficient dissociation degree, is closely intergrown with lead-antimony minerals, and whose reagent action is not sufficient to capture it, a collector 2 with strong collecting ability is added to capture valuable minerals such as tetrahedrite, galena, and jamesonite together to obtain a mixed concentrate, and all valuable minerals are recovered as much as possible.

[0030] The mixed concentrate is de-drugged to remove the reagents on the mineral surface and restore the floatability of the minerals to their original state. The de-drugged mixed concentrate is finely ground to further dissociate tetrahedrite with silver, and at the same time, a high-efficiency collector 1 complexed with copper and silver is added to quickly capture the newly dissociated minerals. However, due to the relatively fine particle size, other minerals will inevitably be entrained. By adding regulator 1 (the regulator 1 added in the present invention is a lead-antimony mineral depressant) and cleaning, this entrainment is reduced, realizing the separation of fine-grained tetrahedrite with silver from lead-antimony minerals, finally realizing the recovery of tetrahedrite with high silver content, obtaining high-grade silver-copper concentrate products, and at the same time realizing the recovery of valuable minerals such as lead and antimony.

[0031] In summary, in view of the problems that in the flotation recovery process of tetrahedrite, independent concentrate products cannot be obtained, resulting in poor concentrate quality, low value, and waste of lead and antimony resources at the same time, by utilizing the differences in the mineral properties between tetrahedrite and lead-antimony minerals, combined with the use of a copper-silver complex high-efficiency collector and a lead-antimony specific inhibitor, and adopting the process of "coarse grinding - fast flotation - bulk flotation - reagent removal - fine grinding - separation", adding the collector during the grinding operation can avoid the oxidation of the fresh tetrahedrite surface and reduce the action force of the collector, while also reducing the dosage of the collector; secondly, by fast flotation, the vast majority of tetrahedrite is recovered, and a small part is recovered by fine grinding and separation, achieving the effects of significantly reducing the collector dosage and significantly reducing the contents of impurities such as lead and antimony in the silver-copper concentrate; thirdly, the present invention can directly obtain silver-copper concentrate through fast flotation, without the need for a cleaning process, reducing the number of equipment and maintenance costs; finally, the present invention obtains independent silver-copper concentrate and lead-antimony concentrate, improving the value of silver, copper, lead, and antimony while realizing the efficient utilization of resources.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The ore dressing method for the flotation recovery of high-silver tetrahedrite provided by the present invention utilizes the characteristics of good floatability and easy oxidation of the dissociation surface of tetrahedrite, and cooperates with a copper-silver high-efficiency complex collector 1 to realize the recovery of the dissociated tetrahedrite by adopting the process of "coarse grinding - fast flotation - bulk flotation - reagent removal - fine grinding - separation"; for the tetrahedrite with finer dissemination, the process of "bulk flotation - reagent removal - fine grinding" is adopted, and the secondary recovery of tetrahedrite is realized by adding regulator 1 (i.e., the lead-antimony mineral inhibitor). Moreover, the present invention realizes the efficient recovery of tetrahedrite through the combined use of two-stage grinding, fast flotation, high-efficiency collector, and regulator 1, obtaining a high-value silver-copper concentrate with a silver grade > 6000 g / t and a copper content greater than 20%, and at the same time obtaining a lead-antimony concentrate product, significantly improving the silver and copper grades and recovery rates in the copper-silver concentrate.

[0034] (2) The ore dressing method for the flotation recovery of high-silver tetrahedrite provided by the present invention realizes the efficient flotation recovery of tetrahedrite, improves the value of tetrahedrite, and at the same time realizes the efficient utilization of resources such as lead and antimony. Compared with the existing bulk flotation or bulk flotation and re-separation processes, it reduces the loss of tetrahedrite, significantly improves the silver and copper grades and recovery rates in the copper-silver concentrate, and at the same time greatly reduces the grinding throughput, achieving the purposes of cost reduction, quality improvement, and efficiency increase on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is the process flow diagram of the ore dressing method for the flotation recovery of high-silver tetrahedrite of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0036] The following is a detailed description of the above content of the present invention in the form of specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments.

[0037] In the experimental methods of the following embodiments of the present invention without specific conditions noted, they are generally carried out under conventional conditions or according to the conditions recommended by the manufacturer. All common chemical reagents used in the embodiments are commercially available products.

[0038] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0039] To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary and not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0040] The following embodiments further describe the present invention, but these embodiments are not intended to limit the protection scope of the present invention.

[0041] Overview of the process of the beneficiation method for the flotation recovery of high-silver tetrahedrite in the present invention:

[0042] The beneficiation method for the flotation recovery of high-silver tetrahedrite in the present invention includes the following steps: After the raw ore is ground and collector 1 is added, it is classified by a hydrocyclone to obtain sand and overflow. The sand enters the flotation machine to obtain flotation concentrate 1 and flotation tailings 1. The overflow enters the flotation machine to obtain flotation concentrate 2 and flotation tailings 2. Flotation concentrate 1 and flotation concentrate 2 are combined into copper-silver concentrate 1, and flotation tailings 1 are returned to the grinding system; Flotation tailings 2 are added with collector 2 and subjected to bulk flotation roughing and scavenging to obtain bulk flotation concentrate (the bulk flotation roughing and scavenging concentrates are combined) and total tailings. After the bulk flotation concentrate is de-drugged, it obtains thickened underflow and overflow. The underflow is then ground and classified, and the classified products are added with regulator 1 and collector 1 for flotation roughing and three-stage cleaning to obtain copper-silver concentrate 2 and various levels of tailings. The roughing tailings are scavenged to obtain scavenging concentrate (returned to roughing) and lead-antimony concentrate, and the remaining cleaning tailings are returned to the previous stage of cleaning.

[0043] It can be seen that the beneficiation method for the flotation recovery of high-silver tetrahedrite adopts the process of "coarse grinding - fast flotation - bulk flotation - de-dosing - fine grinding - separation" to achieve the flotation recovery of tetrahedrite, which mainly includes the following steps: taking copper-silver-lead-antimony polymetallic sulfide ores containing tetrahedrite, chalcopyrite, galena, jamesonite, pyrite, etc. as the treatment raw materials. Taking tetrahedrite as an example, by utilizing the characteristics of good natural floatability and easy oxidation of the dissociation surface of tetrahedrite, silver-efficient complex collector 1 is added in the grinding operation, and the dissociated tetrahedrite is recovered by fast flotation, that is, under the condition of coarse grinding, high-grade silver-copper concentrate 1 is recovered through rapid flotation. For some silver-copper concentrates closely associated with lead-antimony minerals, the process of "bulk flotation - de-dosing - fine grinding" is adopted, and by adding regulator 1 (selective inhibitor of lead-antimony minerals), the secondary recovery of tetrahedrite is achieved, that is, bulk concentrate is obtained through bulk flotation, and after the bulk concentrate is de-dosed and finely ground, adding regulator 1 realizes the separation of fine-grained tetrahedrite from lead-antimony minerals, obtaining silver-copper concentrate 2 and lead-antimony concentrate.

[0044] Example 1 The beneficiation method for the flotation recovery of high-silver tetrahedrite of the present invention

[0045] Test sample: The sulfide ore treated in this example is from a certain concentrator in Xilingol League, Inner Mongolia. The grades of copper, silver, lead, and antimony are 0.62%, 186.5 g / t, 1.13%, and 0.86% respectively. Among them, copper and silver mainly exist in the form of tetrahedrite and chalcopyrite, and lead and antimony mainly exist in the form of jamesonite and galena. It is a typical silver-copper ore with tetrahedrite as the main valuable mineral.

[0046] The collector 1 is prepared from aniline dithiophosphate and disodium ethylenediaminetetraacetate in a mass ratio of 2:1; the collector 2 is prepared from aniline dithiophosphate, ethyl thionocarbamate, and imidazole mercaptan in a mass ratio of 1:1:4; the regulator 1 is prepared from sodium humate, ammonium persulfate, and sodium dichromate in a mass ratio of 1:2:1.

[0047] The beneficiation method for the flotation recovery of high-silver tetrahedrite of the present invention includes the following steps:

[0048] S1. Grind the raw ore and add collector 1. The grinding product is classified by a hydrocyclone to obtain hydrocyclone underflow and hydrocyclone overflow;

[0049] In the grinding operation, the product with a fineness of -0.074 mm accounts for 50%; in the hydrocyclone overflow, the product with a fineness of -0.074 mm accounts for 70%; the dosage of collector 1 is 80 g / t;

[0050] S2. Feed the hydrocyclone underflow obtained in step S1 into a flotation machine for separation to obtain flotation concentrate 1 and flotation tailings 1. The obtained flotation tailings 1 are returned to the grinding system;

[0051] S3. Feed the hydrocyclone overflow obtained in step S1 into a flotation machine for separation to obtain flotation concentrate 2 and flotation tailings 2. Among them, flotation concentrate 2 and flotation concentrate 1 obtained in step S2 are combined into copper-silver concentrate 1.

[0052] Among them, the copper and silver grades in copper-silver concentrate 1 are 22.63% and 7,536 g / t respectively, and the recovery rates are 77.02% and 85.26% respectively; the lead and antimony grades are 2.31% and 1.24% respectively.

[0053] S4. Add collector 2 to the flotation tailings 2 obtained in step S3 for bulk flotation roughing operation to obtain bulk flotation rough concentrate and bulk flotation roughing tailings; add collector 2 to the bulk flotation roughing tailings for bulk flotation scavenging operation to obtain bulk flotation scavenging concentrate and bulk flotation scavenging tailings. Among them, the bulk flotation scavenging concentrate and the bulk flotation rough concentrate are combined into bulk flotation concentrate, and the bulk flotation scavenging tailings are the total tailings.

[0054] The dosage of collector 2 in the bulk flotation roughing operation is 80 g / t, and the dosage in the bulk flotation scavenging operation is 20 g / t.

[0055] S5. Add a depressant to the bulk flotation concentrate obtained in step S4 for depressant addition and thickening to obtain thickened underflow and thickened overflow.

[0056] The depressant is sodium sulfide, and the dosage of the depressant is 1,000 g / t.

[0057] S6. Feed the thickened underflow obtained in step S5 into a grinding and classification system composed of a mill and a hydrocyclone for grinding and hydrocyclone classification to obtain hydrocyclone classification products.

[0058] Among the hydrocyclone classification products, the products with a fineness of -0.074 mm account for 95%.

[0059] Add regulator 1 and collector 1 to the hydrocyclone classification products for flotation roughing operation to obtain roughing concentrate and roughing tailings; add regulator 1 to the roughing concentrate for first cleaning operation to obtain first cleaning concentrate and first cleaning tailings; add regulator 1 to the first cleaning concentrate for second cleaning operation to obtain second cleaning concentrate and second cleaning tailings; add regulator 1 to the second cleaning concentrate for third cleaning operation to obtain copper-silver concentrate 2 and third cleaning tailings.

[0060] Add collector 1 to the roughing tailings for scavenging operation to obtain scavenging concentrate and lead-antimony concentrate.

[0061] In the rough flotation operation, the dosage of regulator 1 is 600 g / t, and the dosage of collector is 60 g / t; in the first cleaning operation, the dosage of regulator 1 is 300 g / t; in the second cleaning operation, the dosage of regulator 1 is 200 g / t; in the third cleaning operation, the dosage of regulator 1 is 100 g / t; in the scavenging operation, the dosage of collector 1 is 15 g / t;

[0062] Among them, the scavenging concentrate is returned to the rough flotation operation, and the tailings from the other cleaning operations are returned to the previous-level cleaning operation; the tailings from the other cleaning operations include the tailings from the first cleaning, the second cleaning, and the third cleaning.

[0063] Among them, the copper and silver grades in copper-silver concentrate 2 are 16.32% and 5634.5 g / t respectively, and the recovery rates are 8.42% and 9.67% respectively; the lead and antimony grades in lead-antimony concentrate are 28.66% and 22.58% respectively, and the recovery rates are 79.89% and 82.71% respectively.

[0064] In summary, after copper-silver concentrate 1 and copper-silver concentrate 2 are combined, copper-silver concentrate with average copper and silver grades of 21.80% and 7285.55 g / t respectively, and recovery rates of 85.44% and 94.93% respectively is obtained; lead-antimony concentrate with lead and antimony grades of 28.66% and 22.58% respectively, and recovery rates of 79.89% and 82.71% respectively is obtained.

[0065] Example 2 Mineral processing method for flotation recovery of high-silver tetrahedrite

[0066] Test sample: The sulfide ore processed in this example is from a certain concentrator in Xiwu Zhu Muqin Banner, Inner Mongolia, where the copper, silver, lead, and antimony grades are 0.35%, 93.55 g / t, 0.85%, and 0.63% respectively. Among them, copper and silver mainly exist in the form of tetrahedrite, and lead and antimony mainly exist in the form of jamesonite and galena, which is a typical silver copper ore with tetrahedrite as the main valuable mineral.

[0067] The collector 1 is prepared by mixing aniline xanthate and disodium ethylenediaminetetraacetate in a mass ratio of 4:1; the collector 2 is prepared by mixing aniline xanthate, ethyl thionocarbamate, and imidazole mercaptan in a mass ratio of 1:2:4; the regulator 1 is prepared by mixing sodium humate, ammonium persulfate, and sodium dichromate in a mass ratio of 1:4:2.

[0068] The mineral processing method for flotation recovery of high-silver tetrahedrite of the present invention includes the following steps:

[0069] S1. Grind the raw ore and add collector 1. The ground product is classified by a hydrocyclone to obtain hydrocyclone underflow and hydrocyclone overflow;

[0070] In the grinding operation, the product with a fineness of -0.074 mm accounts for 45%; in the hydrocyclone overflow, the product with a fineness of -0.074 mm accounts for 65%; the dosage of collector 1 is 40 g / t;

[0071] S2. Feed the hydrocyclone underflow obtained in step S1 into a flotation machine for separation to obtain flotation concentrate 1 and flotation tailings 1, and return the obtained flotation tailings 1 to the grinding system;

[0072] S3. Feed the hydrocyclone overflow obtained in step S1 into a flotation machine for separation to obtain flotation concentrate 2 and flotation tailings 2; among them, flotation concentrate 2 and flotation concentrate 1 obtained in step S2 are combined into copper-silver concentrate 1;

[0073] Among them, the copper and silver grades in copper-silver concentrate 1 are 21.53% and 6,548.6 g / t respectively, and the recovery rates are 72.59% and 82.60% respectively; the lead and antimony grades are 1.63% and 0.98% respectively.

[0074] S4. Add collector 2 to the flotation tailings 2 obtained in step S3 for bulk flotation roughing operation to obtain bulk flotation rough concentrate and bulk flotation roughing tailings; add collector 2 to the bulk flotation roughing tailings for bulk flotation scavenging operation to obtain bulk flotation scavenging concentrate and bulk flotation scavenging tailings; among them, the bulk flotation scavenging concentrate and the bulk flotation rough concentrate are combined into bulk flotation concentrate, and the bulk flotation scavenging tailings are the total tailings;

[0075] The dosage of collector 2 in the bulk flotation roughing operation is 40 g / t, and the dosage in the bulk flotation scavenging operation is 10 g / t;

[0076] S5. Add a depressant to the bulk flotation concentrate obtained in step S4 for de-dosing and thickening to obtain thickened underflow and thickened overflow;

[0077] The depressant is sodium sulfide, and the dosage of the depressant is 500 g / t;

[0078] S6. Feed the thickened underflow obtained in step S5 into a grinding and classification system composed of a mill and a hydrocyclone for grinding and hydrocyclone classification to obtain hydrocyclone classification products;

[0079] In the hydrocyclone classification products, the product with a fineness of -0.074 mm accounts for 85%;

[0080] Add regulator 1 and collector 1 to the hydrocyclone classification products for flotation roughing operation to obtain roughing concentrate and roughing tailings; add regulator 1 to the roughing concentrate for cleaning 1 operation to obtain cleaning 1 concentrate and cleaning 1 tailings; add regulator 1 to the cleaning 1 concentrate for cleaning 2 operation to obtain cleaning 2 concentrate and cleaning 2 tailings; add regulator 1 to the cleaning 2 concentrate for cleaning 3 operation to obtain copper-silver concentrate 2 and cleaning 3 tailings;

[0081] The rougher tailings are added with collector 1 and enter the scavenging operation to obtain scavenging concentrate and lead-antimony concentrate;

[0082] In the rough flotation operation, the dosage of regulator 1 is 400 g / t, and the dosage of collector is 40 g / t; in the first cleaning operation, the dosage of regulator 1 is 200 g / t; in the second cleaning operation, the dosage of regulator 1 is 100 g / t; in the third cleaning operation, the dosage of regulator 1 is 50 g / t; in the scavenging operation, the dosage of collector 1 is 5 g / t;

[0083] Among them, the scavenging concentrate is returned to the rough flotation operation, and the remaining cleaning tailings are returned to the previous-level cleaning; the remaining cleaning tailings include the first cleaning tailings, the second cleaning tailings and the third cleaning tailings.

[0084] Among them, the copper and silver grades in copper-silver concentrate 2 are 14.63% and 3685.9 g / t respectively, and the recovery rates are 8.78% and 8.27% respectively; the lead and antimony grades in the lead-antimony concentrate are 27.36% and 20.54% respectively, and the recovery rates are 81.76% and 82.81% respectively.

[0085] In summary, after copper-silver concentrate 1 and copper-silver concentrate 2 are combined, copper-silver concentrate with copper and silver average grades of 20.49% and 6116.28 g / t respectively, and recovery rates of 81.37% and 90.87% respectively is obtained; lead-antimony concentrate with lead and antimony grades of 27.36% and 20.54% respectively, and recovery rates of 81.76% and 82.81% respectively is obtained.

[0086] Example 3 Mineral processing method for flotation recovery of high-silver tetrahedrite

[0087] Test sample: The sulfide ore processed in this example is a certain copper-silver ore in Chifeng, Inner Mongolia, in which the copper, silver, lead and antimony grades are 0.53%, 1135.20 g / t, 1.36% and 1.23% respectively. Among them, copper and silver mainly exist as tetrahedrite and chalcopyrite, and lead and antimony mainly exist as jamesonite and galena. It is a typical silver copper ore with tetrahedrite as the main valuable mineral.

[0088] The collector 1 is prepared from aniline xanthate and disodium ethylenediaminetetraacetate according to a mass ratio of 4:1; the collector 2 is prepared from aniline xanthate, ethyl thionocarbamate and imidazole mercaptan according to a mass ratio of 1:2:6; the regulator 1 is prepared from sodium humate, ammonium persulfate and sodium dichromate according to a mass ratio of 1:2:2.

[0089] The mineral processing method for flotation recovery of high-silver tetrahedrite of the present invention includes the following steps:

[0090] S1. Grind the raw ore, add collector 1, and the ground product is classified by a hydrocyclone to obtain hydrocyclone underflow and hydrocyclone overflow;

[0091] In the grinding operation, the product with a fineness of -0.074 mm accounts for 45%; in the hydrocyclone overflow, the product with a fineness of -0.074 mm accounts for 60%; the dosage of collector 1 is 65 g / t;

[0092] S2. Feed the hydrocyclone underflow obtained in step S1 into a flotation machine for separation to obtain flotation concentrate 1 and flotation tailings 1, and return the obtained flotation tailings 1 to the grinding system;

[0093] S3. Feed the hydrocyclone overflow obtained in step S1 into a flotation machine for separation to obtain flotation concentrate 2 and flotation tailings 2; among them, flotation concentrate 2 and flotation concentrate 1 obtained in step S2 are combined into copper-silver concentrate 1;

[0094] Among them, the copper and silver grades in copper-silver concentrate 1 are 23.68% and 6,835.20 g / t respectively, and the recovery rates are 77.30% and 87.46% respectively; the lead and antimony grades are 2.11% and 2.53% respectively.

[0095] S4. Add collector 2 to the flotation tailings 2 obtained in step S3 for bulk flotation roughing operation to obtain bulk flotation rough concentrate and bulk flotation roughing tailings; add collector 2 to the bulk flotation roughing tailings for bulk flotation scavenging operation to obtain bulk flotation scavenging concentrate and bulk flotation scavenging tailings; among them, the bulk flotation scavenging concentrate and the bulk flotation rough concentrate are combined into bulk flotation concentrate, and the bulk flotation scavenging tailings are the total tailings;

[0096] The dosage of collector 2 in the bulk flotation roughing operation is 70 g / t, and the dosage in the bulk flotation scavenging operation is 15 g / t;

[0097] S5. Add a depressant to the bulk flotation concentrate obtained in step S4 for de-dosing and thickening; obtain thickened underflow and thickened overflow;

[0098] The depressant is sodium sulfide, and the dosage of the depressant is 800 g / t;

[0099] S6. Feed the thickened underflow obtained in step S5 into a grinding and classification system composed of a mill and a hydrocyclone for grinding and hydrocyclone classification to obtain hydrocyclone classification products;

[0100] In the hydrocyclone classification products, the product with a fineness of -0.074 mm accounts for 85%;

[0101] Add regulator 1 and collector 1 to the hydrocyclone classification products for flotation roughing operation to obtain roughing concentrate and roughing tailings; add regulator 1 to the roughing concentrate for cleaning 1 operation to obtain cleaning 1 concentrate and cleaning 1 tailings; add regulator 1 to the cleaning 1 concentrate for cleaning 2 operation to obtain cleaning 2 concentrate and cleaning 2 tailings; add regulator 1 to the cleaning 2 concentrate for cleaning 3 operation to obtain copper-silver concentrate 2 and cleaning 3 tailings;

[0102] The rough-selected tailings are added with collector 1 and enter the scavenging operation to obtain scavenging concentrate and lead-antimony concentrate;

[0103] In the rough flotation operation, the dosage of regulator 1 is 500 g / t, and the dosage of collector is 50 g / t; in the first cleaning operation, the dosage of regulator 1 is 300 g / t; in the second cleaning operation, the dosage of regulator 1 is 200 g / t; in the third cleaning operation, the dosage of regulator 1 is 100 g / t; in the scavenging operation, the dosage of collector 1 is 10 g / t;

[0104] Among them, the scavenging concentrate is returned to the rough flotation operation, and the remaining cleaning tailings are returned to the previous-level cleaning; the remaining cleaning tailings include the first cleaning tailings, the second cleaning tailings and the third cleaning tailings.

[0105] Among them, the copper and silver grades in copper-silver concentrate 2 are 14.63% and 2685.9 g / t respectively, and the recovery rates are 9.66% and 6.95% respectively; the lead and antimony grades in the lead-antimony concentrate are 31.68% and 24.36% respectively, and the recovery rates are 89.68% and 76.25% respectively.

[0106] In summary, the average copper and silver grades of the copper-silver concentrate (after merging 1 and 2) obtained in this embodiment are 22.16% and 6137.25 g / t respectively, and the recovery rates are 86.96% and 94.41% respectively; the lead and antimony grades of the lead-antimony concentrate are 31.68% and 24.36% respectively, and the recovery rates are 89.68% and 76.25% respectively.

[0107] In summary, after merging copper-silver concentrate 1 and copper-silver concentrate 2, copper-silver concentrate with average copper and silver grades of 22.16% and 6137.25 g / t respectively, and recovery rates of 86.96% and 94.41% respectively is obtained; lead-antimony concentrate with lead and antimony grades of 31.68% and 24.36% respectively, and recovery rates of 89.68% and 76.25% respectively is obtained.

[0108] Comparative Example 1

[0109] An existing beneficiation method, that is, a beneficiation method of bulk flotation-regrinding separation, is used to process the test sample of Example 1.

[0110] The reagents used in the existing beneficiation method include: collector 3 is prepared from ethyl xanthate and ammonium butyl xanthate according to a mass ratio of 2:1; regulator 2 is prepared from potassium dichromate and zinc sulfate according to a mass ratio of 3:1.

[0111] The existing beneficiation method is as follows:

[0112] S1. After the ore passes through the grinding and classification system, a classified product with -0.074 mm accounting for 65% is obtained;

[0113] S2. The classified product is added with 120 g / t of collector 3 and enters the rough selection to obtain the rough selection concentrate and the rough selection tailings; the rough selection tailings are added with 30 g / t of collector 3 and enter the scavenging to obtain the scavenging concentrate and the scavenging tailings; the rough selection concentrate enters the first cleaning to obtain the first cleaning concentrate and the first cleaning tailings; the first cleaning concentrate enters the second cleaning operation to obtain the bulk flotation concentrate and the second cleaning tailings;

[0114] Among them, the grades of copper, silver, lead, and antimony in the bulk flotation concentrate are 10.07%, 3221.82 g / t, 17.11%, and 13.26% respectively.

[0115] S3. After the bulk flotation concentrate is concentrated and dewatered, it enters the grinding and classification system to obtain a classified product with 85% of -0.074 mm. The classified product is added with 600 g / t of regulator 2 and 30 g / t of collector 4 and then enters the rough selection operation; the rough selection concentrate and the rough selection tailings are obtained; the rough selection concentrate is added with 200 g / t of regulator 2 for the first cleaning to obtain the first cleaning concentrate and the first cleaning tailings; the first cleaning concentrate is added with 100 g / t of regulator 2 for the second cleaning to obtain the second cleaning concentrate and the second cleaning tailings; the second cleaning concentrate is added with 100 g / t of regulator 2 for the third cleaning to obtain the copper-silver concentrate and the third cleaning tailings; the rough selection tailings are added with 8 g / t of collector 4 and enter the scavenging to obtain the scavenging concentrate and the lead-antimony concentrate; among them, the scavenging concentrate returns to the rough selection, and the remaining cleaning tailings return to the previous-level cleaning.

[0116] Finally, copper-silver concentrates with copper and silver grades of 16.87% and 5268.5 g / t and recovery rates of 76.52% and 74.73% respectively are obtained; lead-antimony concentrates with lead and antimony grades of 23.37% and 15.71% and recovery rates of 58.66% and 50.37% respectively are obtained.

[0117] Comparative Example 2

[0118] Compared with Example 2, in this comparative example, the process of Example 2 is used to process the test sample of Example 2.

[0119] The medicaments used are adjusted to the medicaments for the existing on-site process, specifically as follows: the collector 1 is replaced with a mixture of ethyl xanthate and butyl ammonium black prepared according to a mass ratio of 2:1; the collector 2 is ethyl thionocarbamate; the regulator 1 is replaced with a mixture of potassium dichromate and zinc sulfate prepared according to a mass ratio of 3:1.

[0120] The specific treatment steps are as follows:

[0121] S1. The original ore is ground and collector 1 is added. The ground product is classified by a hydrocyclone to obtain the hydrocyclone underflow and the hydrocyclone overflow.

[0122] In the grinding operation, the product with a fineness of -0.074 mm accounts for 45%; in the hydrocyclone overflow, the product with a fineness of -0.074 mm accounts for 65%; the dosage of collector 1 is 40 g / t;

[0123] S2. Feed the hydrocyclone underflow obtained in step S1 into a flotation machine for separation to obtain flotation concentrate 1 and flotation tailings 1, and return the obtained flotation tailings 1 to the grinding system;

[0124] S3. Feed the hydrocyclone overflow obtained in step S1 into a flotation machine for separation to obtain flotation concentrate 2 and flotation tailings 2; among them, flotation concentrate 2 and flotation concentrate 1 obtained in step S2 are combined into copper-silver concentrate 1;

[0125] Among them, the copper and silver grades in copper-silver concentrate 1 are 21.86% and 6,835.20 g / t respectively, and the recovery rates are 58.98% and 72.30% respectively; the lead and antimony grades are 2.11% and 2.53% respectively.

[0126] S4. Add collector 2 to the flotation tailings 2 obtained in step S3 for bulk flotation roughing operation to obtain bulk flotation rough concentrate and bulk flotation rough tailings; add collector 2 to the bulk flotation rough tailings for bulk flotation scavenging operation to obtain bulk flotation scavenging concentrate and bulk flotation scavenging tailings; among them, the bulk flotation scavenging concentrate and the bulk flotation rough concentrate are combined into bulk flotation concentrate, and the bulk flotation scavenging tailings are the total tailings;

[0127] The dosage of collector 2 in the bulk flotation roughing operation is 40 g / t, and the dosage in the bulk flotation scavenging operation is 10 g / t;

[0128] S5. Add a depressant to the bulk flotation concentrate obtained in step S4 for de-dosing and thickening to obtain thickened underflow and thickened overflow;

[0129] The depressant is sodium sulfide, and the dosage of the depressant is 500 g / t;

[0130] S6. Feed the thickened underflow obtained in step S5 into a grinding and classification system composed of a mill and a hydrocyclone for grinding operation and hydrocyclone classification to obtain hydrocyclone classification products;

[0131] In the hydrocyclone classification products, the product with a fineness of -0.074 mm accounts for 85%;

[0132] Add regulator 1 and collector 1 to the hydrocyclone classification products for flotation roughing operation to obtain roughing concentrate and roughing tailings; add regulator 1 to the roughing concentrate for cleaning 1 operation to obtain cleaning 1 concentrate and cleaning 1 tailings; add regulator 1 to the cleaning 1 concentrate for cleaning 2 operation to obtain cleaning 2 concentrate and cleaning 2 tailings; add regulator 1 to the cleaning 2 concentrate for cleaning 3 operation to obtain copper-silver concentrate 2 and cleaning 3 tailings;

[0133] The roughly selected tailings are added with collector 1 and enter the scavenging operation to obtain scavenged concentrate and lead-antimony concentrate;

[0134] In the rough flotation operation, the dosage of regulator 1 is 400 g / t, and the dosage of collector is 40 g / t; in the first cleaning operation, the dosage of regulator 1 is 200 g / t; in the second cleaning operation, the dosage of regulator 1 is 100 g / t; in the third cleaning operation, the dosage of regulator 1 is 50 g / t; in the scavenging operation, the dosage of collector 1 is 5 g / t;

[0135] Among them, the scavenged concentrate is returned to the rough flotation operation, and the remaining cleaned tailings are returned to the previous-level cleaning; the remaining cleaned tailings include the first cleaning tailings, the second cleaning tailings and the third cleaning tailings;

[0136] Among them, the copper and silver grades in copper-silver concentrate 2 are 16.33% and 2,685.90 g / t respectively, and the recovery rates are 11.40% and 7.35% respectively; the lead and antimony grades in the lead-antimony concentrate are 28.65% and 22.53% respectively, and the recovery rates are 79.63% and 69.24% respectively.

[0137] In summary, after copper-silver concentrate 1 and copper-silver concentrate 2 are combined, copper-silver concentrate with copper and silver average grades of 20.72% and 5,982.37 g / t respectively and recovery rates of 70.38% and 79.65% respectively is obtained; lead-antimony concentrate with lead and antimony grades of 28.65% and 22.53% respectively and recovery rates of 79.63% and 69.24% respectively is obtained.

[0138] Comparative Example 3

[0139] The existing on-site process is adopted, that is, the test sample of Example 3 is processed and separated by the bulk flotation-fine grinding process to obtain concentrate products.

[0140] The reagents used are the reagents in the present invention: the collector 1 is prepared from dithiophosphate and disodium ethylenediaminetetraacetate in a mass ratio of 4:1; the collector 2 is prepared from dithiophosphate, ethyl thionocarbamate and imidazole mercaptan in a mass ratio of 1:2:6; the regulator 1 is prepared from sodium humate, ammonium persulfate and sodium dichromate in a mass ratio of 1:2:2.

[0141] The specific ore dressing method is as follows:

[0142] S1. After the ore passes through the grinding and classification system, a classified product with a fineness of -0.074 mm accounting for 74% is obtained. 65 g / t of collector 2 is added to the rough selection of the classified product to obtain rough concentrate and rough tailings; the rough tailings enter the scavenging, and 15 g / t of collector 2 is added to obtain scavenged concentrate and scavenged tailings; the rough concentrate enters the first cleaning to obtain first cleaning concentrate and first cleaning tailings; the first cleaning concentrate enters the second cleaning operation to obtain bulk flotation concentrate and second cleaning tailings;

[0143] S2. Add 500 g / t of depressant sodium sulfide to the bulk flotation concentrate for depressant concentration; obtain concentrated underflow and concentrated overflow;

[0144] S3. Feed the obtained concentrated underflow into the grinding and classification system composed of a mill and a hydrocyclone to obtain a hydrocyclone classified product with 85% of the product having a fineness of -0.074 mm;

[0145] S4. Add 400 g / t of regulator 1 and 40 g / t of collector 1 to the hydrocyclone classified product and conduct rough flotation operation to obtain rough flotation concentrate and rough flotation tailings; add 200 g / t of regulator 1 to the rough flotation concentrate for the first cleaning operation to obtain first cleaning concentrate and first cleaning tailings; add 100 g / t of regulator 1 to the first cleaning concentrate for the second cleaning operation to obtain second cleaning concentrate and second cleaning tailings; add 50 g / t of regulator 1 to the second cleaning concentrate for the third cleaning operation to obtain copper-silver concentrate and third cleaning tailings; add collector 1 to the rough flotation tailings for scavenging operation to obtain scavenging concentrate and lead-antimony concentrate;

[0146] Finally, obtain copper-silver concentrates with copper and silver grades of 20.33% and 5674.32 g / t respectively, and recovery rates of 74.80% and 81.84% respectively; obtain lead-antimony concentrates with lead and antimony grades of 25.86% and 21.32% respectively, and recovery rates of 67.69% and 61.70% respectively.

[0147] In summary, from the above results, it can be seen that whether the process flow is replaced with the bulk flotation - grinding separation process on site, or collector 1, collector 2, and regulator 1 are replaced with ethyl xanthogenate + ammonium dibutyl dithiophosphate, ethyl thionocarbamate, and zinc sulfate + potassium dichromate, the grades and recovery rates of the copper-silver concentrates and lead-antimony concentrates are both reduced, proving that the beneficiation method for the flotation recovery of high-silver tetrahedrite in the present invention can play a synergistic effect when combined with collector 1, collector 2, and regulator 1 of the present invention.

[0148] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A beneficiation method for the flotation recovery of high-silver tetrahedrite, characterized in that, It includes the following steps: S1. Conduct grinding operation on the raw ore and add collector 1. The grinding product is classified by a hydrocyclone to obtain hydrocyclone underflow and hydrocyclone overflow; S2. Feed the hydrocyclone underflow obtained in S1 into a flotation machine for separation to obtain flotation concentrate 1 and flotation tailings 1. The obtained flotation tailings 1 are returned to the grinding system; S3. Feed the hydrocyclone overflow obtained in S1 into a flotation machine for separation to obtain flotation concentrate 2 and flotation tailings 2. Among them, flotation concentrate 2 and flotation concentrate 1 obtained in S2 are combined into copper-silver concentrate 1; S4. Add collector 2 to the flotation tailings 2 obtained in S3 for bulk flotation roughing operation to obtain bulk flotation rough concentrate and bulk flotation roughing tailings. Add collector 2 to the bulk flotation roughing tailings for bulk flotation scavenging operation to obtain bulk flotation scavenging concentrate and bulk flotation scavenging tailings. Among them, the bulk flotation scavenging concentrate and the bulk flotation rough concentrate are combined into bulk flotation concentrate, and the bulk flotation scavenging tailings are the total tailings; S5. Add a depressant to the bulk flotation concentrate obtained in S4 for de-dosing and thickening to obtain thickened underflow and thickened overflow; S6. Feed the thickened underflow obtained in S5 into a grinding and classification system composed of a mill and a hydrocyclone for grinding and hydrocyclone classification to obtain hydrocyclone classification products; S7. Add regulator 1 and collector 1 to the hydrocyclone classification products for flotation roughing operation to obtain roughing concentrate and roughing tailings. Add regulator 1 to the roughing concentrate for first cleaning operation to obtain first cleaning concentrate and first cleaning tailings. Add regulator 1 to the first cleaning concentrate for second cleaning operation to obtain second cleaning concentrate and second cleaning tailings. Add regulator 1 to the second cleaning concentrate for third cleaning operation to obtain copper-silver concentrate 2 and third cleaning tailings. Add collector 1 to the roughing tailings for scavenging operation to obtain scavenging concentrate and lead-antimony concentrate. Among them, the scavenging concentrate is returned to the flotation roughing operation, and the remaining cleaning tailings are returned to the previous-level cleaning. The remaining cleaning tailings include first cleaning tailings, second cleaning tailings, and third cleaning tailings.

2. The ore dressing method according to claim 1, characterized in that, In step S1, in the grinding operation, the fineness of particles with a particle size less than 0.074 mm accounts for 45-55% of the total particle mass; in the hydrocyclone overflow, the fineness of particles with a particle size less than 0.074 mm accounts for 60-70% of the total particle mass; the dosage of collector 1 is 40-80 g / t.

3. The ore dressing method according to claim 1, characterized in that In step S4, the dosage of collector 2 in the bulk flotation roughing operation is 40-80 g / t; the dosage of collector 2 in the bulk flotation scavenging operation is 10-20 g / t.

4. The ore dressing method according to claim 1, characterized in that, In step S5, the depressant is sodium sulfide, and its dosage is 500-1000 g / t.

5. The ore dressing method according to claim 1, wherein In step S6, in the hydrocyclone classification products, the fineness of particles with a particle size less than 0.074 mm accounts for 85-95% of the total particle mass.

6. The ore dressing method according to claim 1, wherein In step S7, in the flotation roughing operation, the dosage of regulator 1 is 400-600 g / t, and the dosage of the collector is 40-60 g / t; in the first cleaning operation, the dosage of regulator 1 is 200-300 g / t; in the second cleaning operation, the dosage of regulator 1 is 100-200 g / t; in the third cleaning operation, the dosage of regulator 1 is 50-100 g / t; in the scavenging operation, the dosage of collector 1 is 5-15 g / t.

7. The ore dressing method according to claim 1, characterized in that, The collector 1 is prepared from sodium dimethyl dithiophosphate and disodium ethylenediaminetetraacetate in a mass ratio of (2 - 4):

1.

8. The ore dressing method according to claim 1, wherein The collector 2 is prepared from sodium dimethyl dithiophosphate, ethyl thionocarbamate and imidazole mercaptan in a mass ratio of 1:(1 - 2):(4 - 6).

9. The ore dressing method according to claim 1, characterized in that The regulator 1 is prepared from sodium humate, ammonium persulfate and sodium dichromate in a mass ratio of 1:(2 - 4):(1 - 2).

10. Use of the ore dressing method according to any one of claims 1 to 9 in the ore dressing of copper-silver-lead-antimony polymetallic sulfide ore, characterized in that, The beneficiation of the copper-silver-lead-antimony polymetallic sulfide ore includes tetrahedrite containing silver, chalcopyrite, galena, jamesonite and pyrite.

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