A method for floating tin and zinc in polymetallic sulfide ore

Abstract

The application discloses a method for floating tin and zinc in polymetallic sulfide ore, which comprises the following steps: grinding and thickening the polymetallic sulfide ore, then stirring and desliming the polymetallic sulfide ore by adding papaya seed glue and polyacrylamide, grinding and thickening the polymetallic sulfide ore, and floating the polymetallic sulfide ore by adding a flotation agent A to obtain flotation concentrate C and flotation tailings D, wherein the flotation agent A comprises ethion, zinc sulfate, cationic starch, lime and pine oil; grinding and thickening the flotation concentrate C, and floating the flotation concentrate C by adding a flotation agent F to obtain lead concentrate and flotation tailings G, wherein the flotation agent F comprises sodium tartrate, zinc sulfate, sodium diethyl dithiocarbamate, ethion and pine oil; adding sulfuric acid solution to the flotation tailings D after concentration, and grinding and magnetic separating the flotation tailings D, adding a flotation agent to the magnetic separation tailings to obtain flotation concentrate J, and obtaining tin concentrate by table gravity separation of the flotation concentrate J. The application solves the problem of poor flotation or gravity separation effect of fine-grained tin ore, and can improve the recovery rate of tin and zinc in the polymetallic sulfide ore.

Description

Technical Field

[0001] This invention belongs to the field of polymetallic sulfide ore beneficiation technology, specifically relating to a method for flotation of tin and zinc in polymetallic sulfide ores. Background Technology

[0002] Polymetallic sulfide ores are complex minerals composed of sulfides of different elements, including copper, lead, zinc, tin, and nickel. Common polymetallic sulfide minerals include flavonoids, pyrite, galena, and zirconia. Currently, polymetallic sulfide ores are often beneficiated using flotation, gravity separation, magnetic separation, or a combination of these methods. These methods are very effective for beneficiating copper and lead, but less effective for flotation cassiterite. This is mainly because cassiterite is brittle and easily over-grinds and becomes muddy during the grinding stage, forming fine particles. Flotation or gravity separation is ineffective at recovering fine-grained cassiterite, resulting in low tin recovery rates. Furthermore, the intermingling of various metallic minerals in polymetallic sulfide ores, coupled with the relatively low content of minerals like tin and zinc, further complicates the flotation of tin and zinc. Summary of the Invention

[0003] To address the aforementioned shortcomings, this invention discloses a method for flotation of tin and zinc in polymetallic sulfide ores, which solves the problem of poor flotation or gravity separation effects in fine-grained cassiterite minerals, and can also improve the recovery rate of tin and zinc in polymetallic sulfide ores.

[0004] This invention is achieved using the following technical solution:

[0005] A method for flotation of tin and zinc in polymetallic sulfide ores, comprising the following steps:

[0006] (1) After grinding polymetallic sulfide ore, water is added to adjust the slurry to obtain slurry A. The mass ratio of solid to liquid in slurry A is 1: (5-6). Papaya seed gum and polyacrylamide are added to slurry A and stirred for 30 min to 60 min. Then, it is sent to a hydrocyclone to deslim and obtain sand. The sand is ground and then water is added to adjust the slurry to obtain slurry B. The mass ratio of solid to liquid in slurry B is 1: (3.5-4.5).

[0007] (2) Add flotation agent A to the slurry B obtained in step (1) to perform flotation to obtain flotation concentrate C and flotation tailings D. The weight ratio of flotation agent A to slurry B is (0.3~0.6):1000. The flotation agent A includes the following components in parts by weight: 10~20 parts of ethyl thiocyanate, 10~20 parts of zinc sulfate, 10~20 parts of cationic starch, 50~60 parts of lime, and 5~8 parts of pine oil.

[0008] (3) Grind the flotation concentrate C obtained in step (2) and add water to adjust the slurry to obtain slurry E. Add flotation agent F to slurry E for flotation to obtain lead concentrate and flotation tailings G. Add flotation agent H to flotation tailings G for flotation to obtain zinc concentrate. The weight ratio of flotation agent F to slurry E is (1-2):1000. The flotation agent F includes the following components in parts by weight: sodium tartrate 15-20 parts, zinc sulfate 40-60 parts, black powder 20-30 parts, ethyl thiocyanate 5-10 parts, and pine oil 5-8 parts. The weight ratio of flotation agent H to flotation tailings G is (0.8-1):1000. The flotation agent H includes the following components in parts by weight: butyl xanthate 20-30 parts, copper sulfate 30-50 parts, lime 20-30 parts, and pine oil 3-5 parts.

[0009] (4) The flotation tailings D obtained in step (2) is concentrated to one-third of its original volume to obtain concentrated slurry. Then, sulfuric acid solution is added to the concentrated slurry for grinding. The mass ratio of sulfuric acid solution to concentrated slurry is (1-2):10. Then, a wet weak magnetic separator is used for magnetic separation to obtain magnetic concentrate and magnetic tailings. Then, flotation agent I is added to the magnetic tailings for flotation to obtain flotation concentrate J and tailings. The flotation concentrate J is subjected to shaking table gravity separation to obtain tin concentrate. The weight ratio of flotation agent I to magnetic tailings is (0.8-1):1000. The flotation agent I includes the following components in parts by weight: 15-20 parts lead sulfate, 20-30 parts salicylic acid, 10-15 parts sodium fluorosilicate, 3-5 parts sodium lignosulfonate, and 3-5 parts pine oil.

[0010] Furthermore, in step (1), polymetallic sulfide ore is ground and passed through a sieve of 100-200 mesh, and then water is added to adjust the slurry to obtain slurry A.

[0011] Furthermore, in step (1), particles smaller than 0.074 mm account for more than 80% of the slurry B.

[0012] Furthermore, the stirring speed during the flotation process described in step (2) is 200 r / min to 500 r / min.

[0013] Furthermore, the mass fraction of the sulfuric acid solution in step (4) is 30% to 40%.

[0014] Furthermore, the magnetic field strength of the magnetic separation in step (4) is 800 Oe to 1000 Oe.

[0015] The magnetic concentrate is used to recover iron.

[0016] Compared with existing technologies, this technical solution has the following advantages:

[0017] 1. In this invention, after grinding and preparing polymetallic sulfide ore into a slurry, papaya seed gum and polyacrylamide are first added to adsorb and flocculate mineral particles in the slurry, promoting the settling of mineral particles and separating and removing fine mineral slime particles, which is beneficial to improving the efficiency of subsequent mineral processing. Then, flotation agent A, composed of ethyl thiocyanate, zinc sulfate, cationic starch, lime and pine oil, is added to obtain flotation concentrate C containing lead and zinc and flotation tailings D. The added zinc sulfate, cationic starch and other substances have a synergistic effect that can effectively inhibit the flotation of other metal mineral particles besides lead and zinc, which is beneficial to the recovery of high-purity lead and zinc. Then, flotation agent F, composed of sodium tartrate, zinc sulfate, black dye, ethyl thiocyanate and pine oil, is added to the flotation concentrate C to separate metallic lead from the flotation concentrate C. In particular, the collector composed of black dye and ethyl thiocyanate has better collection selectivity for metallic lead, which is beneficial to the separation of metallic lead and also beneficial to the subsequent flotation of metallic zinc. Simultaneously, this invention first concentrates the flotation tailings D and then grinds it with sulfuric acid solution, allowing the mineral particles in the flotation tailings D to fully contact and react with the sulfuric acid solution, which is beneficial for the dissolution and separation of various mineral particles in the flotation tailings D. Then, magnetic separation can effectively separate metallic iron minerals. Then, flotation agent I, composed of lead sulfate, salicylhydroxyxamic acid, sodium fluorosilicate, sodium lignosulfonate, and pine oil, is added to float metallic tin. The addition of inhibitors composed of sodium fluorosilicate and sodium lignosulfonate can effectively inhibit the flotation of other minerals besides metallic tin, thereby obtaining high-purity tin concentrate.

[0018] 2. The process of this invention is simple and easy to operate, which is conducive to the large-scale beneficiation production of polymetallic sulfide ores. Moreover, this invention effectively solves the problem of poor flotation or gravity separation effect of fine-grained cassiterite minerals, and improves the recovery rate of tin and zinc in polymetallic sulfide ores. At the same time, it can further realize the recycling of valuable metals such as lead and iron, and reduce the pollution of the environment by beneficiation waste. Detailed Implementation

[0019] The present invention is further illustrated by the following examples, but these are not intended to limit the invention. Specific experimental conditions and methods not specified in the following examples are generally conventional methods well known to those skilled in the art.

[0020] Example 1: A method for flotation of tin and zinc in polymetallic sulfide ores, comprising the following steps:

[0021] (1) Take polymetallic sulfide ore, grind it and pass it through a 120-mesh sieve, then add water to adjust the slurry to obtain slurry A. The mass ratio of solid to liquid in slurry A is 1:5.3. Add papaya seed gum and polyacrylamide to slurry A and stir for 40 minutes. Then send it to a hydrocyclone to deslim and obtain sand. Grind the sand and add water to adjust the slurry to obtain slurry B. The mass ratio of solid to liquid in slurry B is 1:4.0. The particles with a particle size of less than 0.074 mm account for more than 80% of the slurry B.

[0022] (2) Add flotation agent A to the slurry B obtained in step (1) and carry out flotation at a stirring speed of 400 r / min to obtain flotation concentrate C and flotation tailings D. The weight ratio of flotation agent A to slurry B is 0.4:1000. The flotation agent A includes the following components in parts by weight: 15 parts of ethyl thiocyanate, 12 parts of zinc sulfate, 15 parts of cationic starch, 52 parts of lime, and 6 parts of pine oil.

[0023] (3) Grind the flotation concentrate C obtained in step (2) and add water to adjust the slurry to obtain slurry E. Add flotation agent F to slurry E for flotation to obtain lead concentrate and flotation tailings G. Add flotation agent H to flotation tailings G for flotation to obtain zinc concentrate. The weight ratio of flotation agent F to slurry E is 1.3:1000. The flotation agent F includes the following components in parts by weight: 16 parts sodium tartrate, 50 parts zinc sulfate, 25 parts black powder, 6 parts ethyl thiocyanate, and 6 parts pine oil. The weight ratio of flotation agent H to flotation tailings G is 0.9:1000. The flotation agent H includes the following components in parts by weight: 25 parts butyl xanthate, 40 parts copper sulfate, 22 parts lime, and 4 parts pine oil.

[0024] (4) The flotation tailings D obtained in step (2) is concentrated to one-third of its original volume to obtain concentrated slurry. Then, sulfuric acid solution is added to the concentrated slurry for grinding. The mass ratio of sulfuric acid solution to concentrated slurry is 1.3:10. Then, a wet weak magnetic separator is used for magnetic separation to obtain magnetic concentrate and magnetic tailings. Then, flotation agent I is added to the magnetic tailings for flotation to obtain flotation concentrate J and tailings. The flotation concentrate J is subjected to shaking table gravity separation to obtain tin concentrate. The weight ratio of flotation agent I to magnetic tailings is 0.85:1000. The flotation agent I includes the following components in parts by weight: 16 parts lead sulfate, 22 parts salicylic acid hydroxamic acid, 14 parts sodium fluorosilicate, 4 parts sodium lignosulfonate, and 4 parts pine oil. The mass fraction of the sulfuric acid solution is 35%, and the magnetic field strength of the magnetic separation is 900 Oe.

[0025] Example 2: A method for flotation of tin and zinc in polymetallic sulfide ores, comprising the following steps:

[0026] (1) Take polymetallic sulfide ore, grind it and pass it through a 100-mesh sieve, then add water to make slurry A. The mass ratio of solid to liquid in slurry A is 1:5. Add papaya seed gum and polyacrylamide to slurry A and stir for 30 minutes. Then send it to a hydrocyclone to deslim and obtain sand. Grind the sand and add water to make slurry B. The mass ratio of solid to liquid in slurry B is 1:3.5. The particles with a particle size of less than 0.074 mm account for more than 80% of the slurry B.

[0027] (2) Add flotation agent A to the slurry B obtained in step (1) and carry out flotation at a stirring speed of 200 / min to obtain flotation concentrate C and flotation tailings D. The weight ratio of flotation agent A to slurry B is 0.3:1000. The flotation agent A includes the following components in parts by weight: 10 parts of ethyl thiocyanate, 10 parts of zinc sulfate, 10 parts of cationic starch, 50 parts of lime, and 5 parts of pine oil.

[0028] (3) Grind the flotation concentrate C obtained in step (2) and add water to adjust the slurry to obtain slurry E. Add flotation agent F to slurry E for flotation to obtain lead concentrate and flotation tailings G. Add flotation agent H to flotation tailings G for flotation to obtain zinc concentrate. The weight ratio of flotation agent F to slurry E is 1:1000. The flotation agent F includes the following components in parts by weight: 15 parts sodium tartrate, 40 parts zinc sulfate, 20 parts black powder, 5 parts ethyl thiocyanate, and 5 parts pine oil. The weight ratio of flotation agent H to flotation tailings G is 0.8:1000. The flotation agent H includes the following components in parts by weight: 20 parts butyl xanthate, 30 parts copper sulfate, 20 parts lime, and 3 parts pine oil.

[0029] (4) The flotation tailings D obtained in step (2) is concentrated to one-third of its original volume to obtain concentrated slurry. Then, sulfuric acid solution is added to the concentrated slurry for grinding. The mass ratio of sulfuric acid solution to concentrated slurry is 1:10. Then, a wet weak magnetic separator is used for magnetic separation to obtain magnetic concentrate and magnetic tailings. Then, flotation agent I is added to the magnetic tailings for flotation to obtain flotation concentrate J and tailings. The flotation concentrate J is subjected to shaking table gravity separation to obtain tin concentrate. The weight ratio of flotation agent I to magnetic tailings is 0.8:1000. The flotation agent I includes the following components in parts by weight: 15 parts lead sulfate, 20 parts salicylic acid hydroxamic acid, 10 parts sodium fluorosilicate, 3 parts sodium lignosulfonate, and 3 parts pine oil. The mass fraction of the sulfuric acid solution is 30%, and the magnetic field strength of the magnetic separation is 800 Oe.

[0030] Example 3: A method for flotation of tin and zinc in polymetallic sulfide ores, comprising the following steps:

[0031] (1) Take polymetallic sulfide ore, grind it and pass it through a 150-mesh sieve, then add water to adjust the slurry to obtain slurry A. The mass ratio of solid to liquid in slurry A is 1:5.8. Add papaya seed gum and polyacrylamide to slurry A and stir for 50 minutes. Then send it to a hydrocyclone to deslim and obtain sand. Grind the sand and add water to adjust the slurry to obtain slurry B. The mass ratio of solid to liquid in slurry B is 1:4.2. The particles with a particle size of less than 0.074 mm account for more than 80% of the slurry B.

[0032] (2) Add flotation agent A to the slurry B obtained in step (1) and carry out flotation at a stirring speed of 400 r / min to obtain flotation concentrate C and flotation tailings D. The weight ratio of flotation agent A to slurry B is 0.5:1000. The flotation agent A includes the following components in parts by weight: 18 parts of ethyl thiocyanate, 18 parts of zinc sulfate, 18 parts of cationic starch, 55 parts of lime, and 7 parts of pine oil.

[0033] (3) Grind the flotation concentrate C obtained in step (2) and add water to adjust the slurry to obtain slurry E. Add flotation agent F to slurry E for flotation to obtain lead concentrate and flotation tailings G. Add flotation agent H to flotation tailings G for flotation to obtain zinc concentrate. The weight ratio of flotation agent F to slurry E is 1.8:1000. The flotation agent F includes the following components in parts by weight: 18 parts sodium tartrate, 50 parts zinc sulfate, 25 parts black powder, 8 parts ethyl thiocyanate, and 7 parts pine oil. The weight ratio of flotation agent H to flotation tailings G is 0.9:1000. The flotation agent H includes the following components in parts by weight: 28 parts butyl xanthate, 45 parts copper sulfate, 28 parts lime, and 4 parts pine oil.

[0034] (4) The flotation tailings D obtained in step (2) is concentrated to one-third of its original volume to obtain concentrated slurry. Then, sulfuric acid solution is added to the concentrated slurry for grinding. The mass ratio of sulfuric acid solution to concentrated slurry is 1.7:10. Then, a wet weak magnetic separator is used for magnetic separation to obtain magnetic concentrate and magnetic tailings. Then, flotation agent I is added to the magnetic tailings for flotation to obtain flotation concentrate J and tailings. The flotation concentrate J is subjected to shaking table gravity separation to obtain tin concentrate. The weight ratio of flotation agent I to magnetic tailings is 0.9:1000. The flotation agent I includes the following components in parts by weight: 18 parts lead sulfate, 26 parts salicylic acid hydroxamic acid, 14 parts sodium fluorosilicate, 4 parts sodium lignosulfonate, and 4 parts pine oil. The mass fraction of the sulfuric acid solution is 36%, and the magnetic field strength of the magnetic separation is 900 Oe.

[0035] Example 4: A method for flotation of tin and zinc in polymetallic sulfide ores, comprising the following steps:

[0036] (1) Take polymetallic sulfide ore, grind it and pass it through a 200-mesh sieve, then add water to make slurry A. The mass ratio of solid to liquid in slurry A is 1:6. Add papaya seed gum and polyacrylamide to slurry A and stir for 60 minutes. Then send it to a hydrocyclone to deslim and obtain sand. Grind the sand and add water to make slurry B. The mass ratio of solid to liquid in slurry B is 1:4.5. The particles with a particle size of less than 0.074 mm account for more than 80% of the slurry B.

[0037] (2) Add flotation agent A to the slurry B obtained in step (1) and carry out flotation at a stirring speed of 500 r / min to obtain flotation concentrate C and flotation tailings D. The weight ratio of flotation agent A to slurry B is 0.6:1000. The flotation agent A includes the following components in parts by weight: 20 parts of ethyl thiocyanate, 20 parts of zinc sulfate, 20 parts of cationic starch, 60 parts of lime, and 8 parts of pine oil.

[0038] (3) Grind the flotation concentrate C obtained in step (2) and add water to adjust the slurry to obtain slurry E. Add flotation agent F to slurry E for flotation to obtain lead concentrate and flotation tailings G. Add flotation agent H to flotation tailings G for flotation to obtain zinc concentrate. The weight ratio of flotation agent F to slurry E is 2:1000. The flotation agent F includes the following components in parts by weight: 20 parts sodium tartrate, 60 parts zinc sulfate, 30 parts black powder, 10 parts ethyl thiocyanate, and 8 parts pine oil. The weight ratio of flotation agent H to flotation tailings G is 1:1000. The flotation agent H includes the following components in parts by weight: 30 parts butyl xanthate, 50 parts copper sulfate, 30 parts lime, and 5 parts pine oil.

[0039] (4) The flotation tailings D obtained in step (2) is concentrated to one-third of its original volume to obtain concentrated slurry. Then, sulfuric acid solution is added to the concentrated slurry for grinding. The mass ratio of sulfuric acid solution to concentrated slurry is 2:10. Then, a wet weak magnetic separator is used for magnetic separation to obtain magnetic concentrate and magnetic tailings. Then, flotation agent I is added to the magnetic tailings for flotation to obtain flotation concentrate J and tailings. The flotation concentrate J is subjected to shaking table gravity separation to obtain tin concentrate. The weight ratio of flotation agent I to magnetic tailings is 1:1000. The flotation agent I includes the following components in parts by weight: 20 parts lead sulfate, 30 parts salicylic acid hydroxamic acid, 15 parts sodium fluorosilicate, 5 parts sodium lignosulfonate, and 5 parts pine oil. The mass fraction of the sulfuric acid solution is 40%, and the magnetic field strength of the magnetic separation is 1000 Oe.

[0040] Comparative Example 1: The method for flotation of tin and zinc in polymetallic sulfide ores described in this comparative example differs from the method described in Example 1 only in that, in step (1), polyacrylamide is added to slurry A and stirred for 60 min.

[0041] Comparative Example 2: The method for flotation of tin and zinc in polymetallic sulfide ores described in this comparative example differs from the method described in Example 1 only in that, in step (1), papaya seed gum is added to slurry A and stirred for 60 minutes.

[0042] Comparative Example 3: The method for flotation of tin and zinc in polymetallic sulfide ores described in this comparative example differs from the method described in Example 1 only in that, in step (2), cationic starch is not added to the flotation agent A.

[0043] Comparative Example 4: The method for flotation of tin and zinc in polymetallic sulfide ores described in this comparative example differs from the method described in Example 1 only in that, in step (3), ethyl thiocyanate is not added to the flotation agent F.

[0044] Experimental example: The composition of polymetallic sulfide ore was determined (see Table 1 for specific results), and then tin concentrate and zinc concentrate were obtained by flotation according to the methods described in Examples 1-4 and Comparative Examples 1-4. The recovery rates of tin and zinc by different flotation methods are shown in Table 2.

[0045] Table 1. Results of determination of some components in polymetallic sulfide ores

[0046] tin lead Zinc antimony sulfur Element content (%) 0.31 0.39 0.92 0.31 3.11

[0047] Table 2 Recovery rates of tin and zinc by different flotation methods

[0048] Example 1 Example 2 Example 3 Example 4 Tin recovery rate (%) 71.6 70.9 72.3 70.5 Zinc recovery rate (%) 75.9 73.8 75.1 74.2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Tin recovery rate (%) 63.8 65.7 60.3 54.1 Zinc recovery rate (%) 68.4 70.3 63.7 60.4

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for flotation of tin and zinc in polymetallic sulfide ores, characterized in that: Includes the following steps: (1) After grinding polymetallic sulfide ore, water is added to adjust the slurry to obtain slurry A. The mass ratio of solid to liquid in slurry A is 1: (5-6). Papaya seed gum and polyacrylamide are added to slurry A and stirred for 30 min to 60 min. Then, it is sent to a hydrocyclone to deslim and obtain sand. The sand is ground and then water is added to adjust the slurry to obtain slurry B. The mass ratio of solid to liquid in slurry B is 1: (3.5-4.5). (2) Add flotation agent A to the slurry B obtained in step (1) to perform flotation to obtain flotation concentrate C and flotation tailings D. The weight ratio of flotation agent A to slurry B is (0.3~0.6):1000. The flotation agent A includes the following components in parts by weight: 10~20 parts of ethyl thiocyanate, 10~20 parts of zinc sulfate, 10~20 parts of cationic starch, 50~60 parts of lime, and 5~8 parts of pine oil. (3) Grind the flotation concentrate C obtained in step (2) and add water to adjust the slurry to obtain slurry E. Add flotation agent F to slurry E for flotation to obtain lead concentrate and flotation tailings G. Add flotation agent H to flotation tailings G for flotation to obtain zinc concentrate. The weight ratio of flotation agent F to slurry E is (1-2):1000. The flotation agent F includes the following components in parts by weight: sodium tartrate 15-20 parts, zinc sulfate 40-60 parts, black powder 20-30 parts, ethyl thiocyanate 5-10 parts, and pine oil 5-8 parts. The weight ratio of flotation agent H to flotation tailings G is (0.8-1):1000. The flotation agent H includes the following components in parts by weight: butyl xanthate 20-30 parts, copper sulfate 30-50 parts, lime 20-30 parts, and pine oil 3-5 parts. (4) The flotation tailings D obtained in step (2) is concentrated to one-third of its original volume to obtain concentrated slurry. Then, sulfuric acid solution is added to the concentrated slurry for grinding. The mass ratio of sulfuric acid solution to concentrated slurry is (1-2):

10. Then, a wet weak magnetic separator is used for magnetic separation to obtain magnetic concentrate and magnetic tailings. Then, flotation agent I is added to the magnetic tailings for flotation to obtain flotation concentrate J and tailings. The flotation concentrate J is subjected to shaking table gravity separation to obtain tin concentrate. The weight ratio of flotation agent I to magnetic tailings is (0.8-1):1000. The flotation agent I includes the following components in parts by weight: 15-20 parts lead sulfate, 20-30 parts salicylic acid, 10-15 parts sodium fluorosilicate, 3-5 parts sodium lignosulfonate, and 3-5 parts pine oil.

2. The method for flotation of tin and zinc in polymetallic sulfide ores according to claim 1, characterized in that: In step (1), polymetallic sulfide ore is ground and passed through a sieve of 100-200 mesh, and then water is added to adjust the slurry to obtain slurry A.

3. The method for flotation of tin and zinc in polymetallic sulfide ores according to claim 1, characterized in that: In step (1), more than 80% of the slurry B contains particles smaller than 0.074 mm.

4. The method for flotation of tin and zinc in polymetallic sulfide ores according to claim 1, characterized in that: The stirring speed during the flotation process described in step (2) is 200 r / min to 500 r / min.

5. The method for flotation of tin and zinc in polymetallic sulfide ores according to claim 1, characterized in that: The mass fraction of the sulfuric acid solution in step (4) is 30% to 40%.

6. The method for flotation of tin and zinc in polymetallic sulfide ores according to claim 1, characterized in that: The magnetic field strength of the magnetic separation in step (4) is 800 Oe to 1000 Oe.