A method for recovering mica from molybdenum tailings

Abstract

This invention discloses a method for recovering mica from molybdenum tailings. The molybdenum tailings are ground and the slurry is adjusted to a specific concentration. The pH of the slurry is then adjusted to a certain value. Oxalic acid and a mixed collector are added sequentially to the slurry, and after stirring for a certain time, aeration is performed for roughing. The slurry from the bottom of the flotation cell after roughing is then scavenged. The froth product from the scavenging flotation cell is middlings 1, and the slurry product from the bottom of the scavenging flotation cell is the final tailings. The roughing concentrate undergoes 3-5 cleaning operations. Middlings 1 and middlings 2 from the first cleaning operation are combined and returned to the roughing operation. The feed for each cleaning operation is the froth product from the previous cleaning operation, and the slurry product from the bottom of the flotation cell in each cleaning operation is returned to the previous cleaning operation. The froth product collected in the final cleaning operation is the final mica concentrate. This method has the advantages of a short and simple process, easy operation and control, low reagent consumption, and high mica recovery rate from molybdenum tailings.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, and in particular to a method for recovering mica from molybdenum tailings. Background Technology

[0002] my country possesses abundant molybdenum resources, but the low grade, fine grain size, and numerous and complex associated minerals result in a long beneficiation process, high enrichment ratios, and large tailings emissions. Statistics show that my country generates approximately 6 million tons of molybdenum tailings annually. The massive discharge of molybdenum tailings not only occupies vast amounts of land and poses serious ecological and environmental safety hazards, but also increases the costs for enterprise treatment and tailings dam maintenance.

[0003] Molybdenum tailings contain a variety of non-metallic minerals, such as feldspar, quartz, mica, talc, garnet, calcite, fluorite, topaz, apatite, and chlorite. For example, in a copper-molybdenum tailings mine in Chifeng, the content of potassium feldspar is 54.44%, sodium feldspar is 24.75%, quartz is 14.85%, and other valuable non-metallic minerals such as biotite and sericite account for approximately 5%. In a molybdenum tailings mine in the Greater Khingan Mountains, the content of feldspar and quartz is 41% and 42%, respectively, with the remaining 10% consisting of mica, calcite, and ilmenite, and 5% of carbonates. Recovering non-metallic minerals from molybdenum tailings is of great significance for reducing tailings emissions, improving resource utilization efficiency, and increasing the economic benefits of enterprises.

[0004] Flotation is a common method for recovering mica from tailings, and collectors play a crucial role in the flotation recovery of mica from molybdenum tailings. Currently, commonly used mica flotation collectors include cationic collectors, anionic collectors, chelating collectors, and mixed collectors. Mixed collectors, combining the advantages of both cationic and anionic collectors, have certain advantages in the flotation recovery of mica from molybdenum tailings. A mixed collector of sodium dodecyl sulfate (SDS) and dodecylamine (DDA) was used to recover biotite by flotation at a molar ratio of 5:1 and a concentration of 5 × 10⁻⁶. -4 At a concentration of mol / L, the recovery rate of biotite can reach over 90%. Furthermore, a mixed collector of dodecylamine and sodium dodecyl sulfonate in a 1:1 molar ratio can also achieve the separation of mica and feldspar at a pulp pH of 6.0.

[0005] Currently, mixed collectors still suffer from problems such as insufficient selectivity, large dosage, and narrow applicable pH range in the flotation recovery of mica. Therefore, developing a new method for recovering mica from molybdenum tailings is of great significance. Summary of the Invention

[0006] To address the shortcomings of existing technologies for recovering mica from molybdenum tailings, the present invention aims to provide a method for recovering mica from molybdenum tailings, comprising the following steps:

[0007] Step 1: Prepare a slurry with a mass fraction of 50-65% using molybdenum tailings and water, and transfer it to a ball mill for grinding to obtain a slurry with 80-90% of particles of -0.074mm size.

[0008] Step 2: Pour the ground slurry into the flotation machine, control the slurry concentration to 20-35%, and adjust the slurry pH to 8.0-10.0;

[0009] Step 3: Add 150-250 g / t of oxalic acid to the slurry from Step 2 as a gangue mineral inhibitor, and stir for 3 minutes;

[0010] Step 4: Add 150-300 g / t of mixed collector to the slurry from Step 3. The molar ratio of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in the mixed collector is 1:2.5-1:4.5. Stir for 3 min.

[0011] Step 5: Aerate the slurry from Step 4 for roughing flotation for 4 minutes, and collect the flotation froth product to obtain the roughing concentrate and the product at the bottom of the flotation cell;

[0012] Step 6: Add 50-100g / t of oxalic acid and 80-200g / t of mixed collector to the product at the bottom of the flotation cell in Step 5. Stir for 3 minutes, then aerate and perform scavenging. Collect the frothy product to obtain middlings 1, and the slurry product at the bottom of the flotation cell to obtain the final tailings.

[0013] Step 7: Perform 3-5 more cleaning operations on the roughing concentrate from Step 5. No flotation reagents are added in the first cleaning operation. 50-150g / t of mixed collector is added in the second cleaning operation. No collector is added in the third cleaning operation. No collector is added in subsequent cleaning operations. The feed for each cleaning operation is the froth product from the previous cleaning operation. The slurry product from the bottom of the flotation cell in each cleaning operation is returned to the previous cleaning operation. The slurry from the bottom of the flotation cell in the first cleaning operation and the ore 1 from the scavenging operation are combined and returned to the roughing operation. The froth product collected in the last cleaning operation is the final mica concentrate.

[0014] Compared with the prior art, the present invention can achieve at least the following beneficial effects:

[0015] (1) The present invention provides a mica flotation mixed collector, namely a mixed collector of octadecyl dimethyl benzyl ammonium chloride and sodium oleate, which has strong selectivity, is suitable for alkaline slurry environment, and does not corrode flotation equipment.

[0016] (2) The present invention provides a method for recovering mica from molybdenum tailings, which has a short process, low energy consumption and mineral processing cost, and significant economic benefits.

[0017] (3) The present invention provides a method for recovering mica from molybdenum tailings, which uses only flotation to efficiently recover mica from molybdenum tailings, and has the advantages of being simple, easy to operate and easy to control. Attached Figure Description

[0018] Figure 1 This is the process flow diagram for Implementation Case 4;

[0019] Figure 2 This is a process flow diagram of the method of the present invention, and also a process flow diagram of implementation example 5; Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] The following describes a method for recovering mica from molybdenum tailings in conjunction with specific embodiments.

[0022] This invention discloses a method for recovering mica from molybdenum tailings, comprising the following steps:

[0023] Step 1: Prepare a slurry with a mass fraction of 50-65% using molybdenum tailings and water, and transfer it to a ball mill for grinding to obtain a slurry with 80-90% of particles of -0.074mm size.

[0024] Step 2: Pour the ground slurry into the flotation machine, control the slurry concentration to 20-35%, and adjust the slurry pH to 8.0-10.0;

[0025] Step 3: Add 150-250 g / t of oxalic acid to the slurry from Step 2 as a gangue mineral inhibitor, and stir for 3 minutes;

[0026] Step 4: Add 150-300 g / t of mixed collector to the slurry from Step 3. The molar ratio of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in the mixed collector is 1:2.5-1:4.5. Stir for 3 min.

[0027] Step 5: Aerate the slurry from Step 4 for roughing flotation for 4 minutes, and collect the flotation froth product to obtain the roughing concentrate and the product at the bottom of the flotation cell;

[0028] Step 6: Add 50-100g / t of oxalic acid and 80-200g / t of mixed collector to the product at the bottom of the flotation cell in Step 5. Stir for 3 minutes, then aerate and perform scavenging. Collect the frothy product to obtain middlings 1, and the slurry product at the bottom of the flotation cell to obtain the final tailings.

[0029] Step 7: Perform 3-5 more cleaning operations on the roughing concentrate from Step 5. No flotation reagents are added in the first cleaning operation. 50-150g / t of mixed collector is added in the second cleaning operation. No collector is added in the third cleaning operation. No collector is added in subsequent cleaning operations. The feed for each cleaning operation is the froth product from the previous cleaning operation. The slurry product from the bottom of the flotation cell in each cleaning operation is returned to the previous cleaning operation. The slurry from the bottom of the flotation cell in the first cleaning operation and the ore 1 from the scavenging operation are combined and returned to the roughing operation. The froth product collected in the last cleaning operation is the final mica concentrate.

[0030] The mixed collector is composed of octadecyl dimethyl benzyl ammonium chloride and sodium oleate.

[0031] The mixed collector is formulated by mixing octadecyl dimethyl benzyl ammonium chloride and sodium oleate in a molar ratio of 1:2.5-1:4.5.

[0032] The dosage of the mixed collector in the roughing operation is 150-300 g / t, and the dosage of the mixed collector in the scavenging operation is 80-200 g / t. No collector is added in the first cleaning operation, and 50-150 g / t of mixed collector is added in the second cleaning operation. No collector is added in subsequent cleaning operations.

[0033] Oxalic acid is used as a gangue mineral inhibitor. The dosage of oxalic acid in the roughing operation is 150-250 g / t, and the dosage of oxalic acid in the scavenging operation is 50-100 g / t.

[0034] Example 1

[0035] This embodiment provides a method for recovering mica from molybdenum tailings.

[0036] In this embodiment, a mixed ore of muscovite, albite, and quartz with a particle size of 0.038mm-0.074mm is used, wherein the mass ratio of the three is 2:3:5, the content of muscovite is 20%, the content of albite is 30%, and the content of quartz is 50%.

[0037] Step 1: Prepare a slurry with a mass fraction of 30% using the mixed ore and water, adjust the pH of the slurry to 10.0, and stir for 3 minutes;

[0038] Step 2: Add 200g / t of oxalic acid to the slurry and stir for 3 minutes;

[0039] Step 3: Add 150 g / t of mixed collector to the slurry. The molar ratio of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in the mixed collector is 1:3. Stir for 3 min.

[0040] Step 4: Aerate the slurry and float for 4 minutes. Collect the flotation foam product to obtain mica concentrate, dry it, weigh it, and test it.

[0041] Test results show that the mica concentrate contains 87.7% muscovite, 4.2% albite, and 8.1% quartz.

[0042] Example 2

[0043] This embodiment provides a method for recovering mica from molybdenum tailings.

[0044] In this embodiment, a mixed ore of muscovite, albite, and quartz with a particle size of 0.038mm-0.074mm is used, wherein the mass ratio of the three is 1:3:6, the content of muscovite is 10%, the content of albite is 30%, and the content of quartz is 60%.

[0045] Step 1: Prepare a slurry with a mass fraction of 30% using the mixed ore and water, adjust the pH of the slurry to 8.0, and stir for 3 minutes;

[0046] Step 2: Add 250g / t of oxalic acid to the slurry and stir for 3 minutes;

[0047] Step 3: Add 100g / t of mixed collector to the slurry. The molar ratio of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in the mixed collector is 1:2.5. Stir for 3 minutes.

[0048] Step 4: Aerate the slurry and float for 4 minutes. Collect the flotation foam product to obtain mica concentrate, dry it, weigh it, and test it.

[0049] Test results show that the mica concentrate contains 81.9% muscovite, 5.7% albite, and 12.4% quartz.

[0050] Example 3

[0051] This embodiment provides a method for recovering mica from molybdenum tailings.

[0052] In this embodiment, a molybdenum tailings deposit from Luanchuan, Henan Province was used, containing 53% quartz, 18% potassium feldspar, 16% plagioclase, 7% mica, 1.5% diopside, 1% amphibole, and 3.5% other minerals.

[0053] Step 1: Prepare a slurry with a mass fraction of 55% using molybdenum tailings and water, and transfer it to a ball mill for grinding to obtain a slurry with a particle size of -0.074mm accounting for 83.15%;

[0054] Step 2: Pour the ground slurry into the flotation machine, control the slurry concentration to 35%, and adjust the slurry pH to 9.0;

[0055] Step 3: Add 250g / t of oxalic acid to the slurry and stir for 3 minutes;

[0056] Step 4: Add 180 g / t of mixed collector to the slurry. The molar ratio of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in the mixed collector is 1:3.5. Stir for 3 min.

[0057] Step 5: Aerate the slurry and float for 4 minutes. Collect the flotation foam product to obtain mica concentrate, dry it, weigh it, and test it.

[0058] Test results showed that the yield of mica concentrate was 24.6%, the mica content was 21.2%, and the mica recovery rate was 74.5%.

[0059] Example 4

[0060] This embodiment provides a method for recovering mica from molybdenum tailings, the process flow of which is as follows: Figure 1 As shown.

[0061] In this embodiment, a molybdenum tailings deposit from Luanchuan, Henan Province was used, containing 53% quartz, 18% potassium feldspar, 16% plagioclase, 7% mica, 1.5% diopside, 1% amphibole, and 3.5% other minerals.

[0062] Step 1: Prepare a slurry with a mass fraction of 55% using molybdenum tailings and water, and transfer it to a ball mill for grinding to obtain a slurry with a particle size of -0.074mm accounting for 87.62%;

[0063] Step 2: Pour the ground slurry into the flotation machine, control the slurry concentration to 35%, and adjust the slurry pH to 10.0;

[0064] Step 3: Add 250g / t of oxalic acid to the slurry and stir for 3 minutes;

[0065] Step 4: Add 200g / t of mixed collector to the slurry. The molar ratio of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in the mixed collector is 1:3. After stirring for 3 minutes, aerate the slurry and carry out roughing operation for 4 minutes. Collect the flotation froth product to obtain the roughing concentrate and the slurry product at the bottom of the flotation cell.

[0066] Step 5: Continue to add 100g / t of mixed collector to the flotation cell in Step 4, stir for 3 minutes, then aerate the slurry to carry out scavenging operation, collect the froth product to obtain middlings 1, and the product at the bottom of the flotation cell to obtain the final tailings.

[0067] Step 6: Transfer the flotation froth product from Step 4 to the flotation machine, stir for 3 minutes, aerate, and then perform the first cleaning operation for 3 minutes. Collect the froth product and the product at the bottom of the flotation cell to obtain middlings 2.

[0068] Step 7: Transfer the flotation froth product from Step 6 to the flotation machine, stir for 3 minutes, add 100 g / t of mixed collector (octadecyl dimethyl benzyl ammonium chloride and sodium oleate in a molar ratio of 1:3), stir for 3 minutes, aerate, and then perform a second cleaning operation for 3 minutes. Collect the froth product and the product at the bottom of the flotation cell to obtain middlings 3.

[0069] Step 8: Transfer the flotation froth product from Step 7 to the flotation machine, stir for 3 minutes, aerate, and then perform a third cleaning operation for 3 minutes. Collect the froth product, filter, and dry to obtain the final mica concentrate. The product at the bottom of the flotation cell is the middlings 4. Weigh and test the final mica concentrate.

[0070] Test results showed that the yield of mica concentrate was 3.53%, the mica content was 84.5%, and the mica recovery rate was 42.7%.

[0071] Example 5

[0072] This embodiment provides a method for recovering mica from molybdenum tailings, the process flow of which is as follows: Figure 2 As shown.

[0073] In this embodiment, a molybdenum tailings deposit from Luanchuan, Henan Province was used, containing 53% quartz, 18% potassium feldspar, 16% plagioclase, 7% mica, 1.5% diopside, 1% amphibole, and 3.5% other minerals.

[0074] Step 1: Prepare a slurry with a mass fraction of 55% using molybdenum tailings and water, and transfer it to a ball mill for grinding to obtain a slurry with a particle size of -0.074mm accounting for 84.37%;

[0075] Step 2: Pour the ground slurry into the flotation machine, control the slurry concentration to 35%, and adjust the slurry pH to 9.0;

[0076] Step 3: Add 250g / t of oxalic acid to the slurry and stir for 3 minutes;

[0077] Step 4: Add 200g / t of mixed collector to the slurry. The molar ratio of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in the mixed collector is 1:4. After stirring for 3 minutes, aerate the slurry for roughing operation. Float for 4 minutes and collect the flotation froth product and the slurry product at the bottom of the flotation cell.

[0078] Step 5: Add 150g / t of mixed collector (octadecyl dimethyl benzyl ammonium chloride and sodium oleate in a molar ratio of 1:4) to the slurry in the flotation cell in Step 4, stir for 3 minutes, aerate and perform scavenging operation, collect the froth product after 3 minutes of flotation to obtain middlings 1, and the product at the bottom of the flotation cell to obtain tailings.

[0079] Step 6: Transfer the flotation froth product from Step 4 to the flotation machine, stir for 3 minutes, aerate for the first cleaning operation, clean for 3 minutes, collect the froth product and the product at the bottom of the flotation cell to obtain middlings 2;

[0080] Step 7: Transfer the flotation froth product from Step 6 to the flotation machine, stir for 3 minutes, add 100 g / t of mixed collector (octadecyl dimethyl benzyl ammonium chloride and sodium oleate in a molar ratio of 1:3), stir for 3 minutes, aerate for a second cleaning operation, clean for 3 minutes, collect the froth product and the product at the bottom of the flotation cell to obtain middlings 3.

[0081] Step 8: Transfer the flotation froth product from Step 7 to the flotation machine, stir for 3 minutes, aerate for a third cleaning operation, clean for 3 minutes, collect the froth product and the product at the bottom of the flotation cell to obtain middlings 4;

[0082] Step 9: After merging and concentrating middlings 1 and 2, return them to the next roughing operation. Return middlings 3 to the first cleaning operation and middlings 4 to the second cleaning operation. Repeat steps 2 to 8 and conduct a closed-circuit test.

[0083] Step 10: When the sum of the final mica concentrate mass and the tailings mass equals the mass of the dry material entering the roughing operation, stop repeating the test, weigh and analyze the obtained final mica concentrate and tailings.

[0084] Test results showed that the yield of mica concentrate was 5.79%, the mica content was 82.9%, and the mica recovery rate was 68.6%.

[0085] Comparative Example 1

[0086] In this embodiment, a mixed ore of muscovite, albite, and quartz with a particle size of 0.038mm-0.074mm is used, wherein the mass ratio of the three is 2:3:5, the content of muscovite is 20%, the content of albite is 30%, and the content of quartz is 50%.

[0087] Step 1: Prepare a slurry with a mass fraction of 30% using the mixed ore and water, adjust the pH of the slurry to 10.0, and stir for 3 minutes.

[0088] Step 2: Add 200g / t of oxalic acid to the slurry and stir for 3 minutes;

[0089] Step 3: Add 150 g / t of octadecyl dimethyl benzyl ammonium chloride to the slurry and stir for 3 minutes;

[0090] Step 4: Aerate the slurry and float for 4 minutes. Collect the flotation foam product to obtain mica concentrate, dry it, weigh it, and test it.

[0091] Test results show that the mica concentrate contains 30.4% muscovite, 21.2% albite, and 48.4% quartz.

[0092] Comparative Example 2

[0093] This embodiment provides a method for recovering mica from molybdenum tailings, the process flow of which is as follows: Figure 1 As shown.

[0094] In this embodiment, a mixed ore of muscovite, albite, and quartz with a particle size of 0.038mm-0.074mm is used, wherein the mass ratio of the three is 1:3:6, the content of muscovite is 10%, the content of albite is 30%, and the content of quartz is 60%.

[0095] Step 1: Prepare a slurry with a mass fraction of 30% using the mixed ore and water, adjust the pH of the slurry to 8.0, and stir for 3 minutes.

[0096] Step 2: Add 250g / t of oxalic acid to the slurry and stir for 3 minutes;

[0097] Step 3: Add 100g / t of sodium oleate to the slurry and stir for 3 minutes;

[0098] Step 4: Aerate the slurry and float for 4 minutes. Collect the flotation foam product to obtain mica concentrate, dry it, weigh it, and test it.

[0099] Test results show that the mica concentrate contains 11.6% muscovite, 20.1% albite, and 68.3% quartz.

[0100] Comparative Example 3

[0101] This embodiment provides a method for recovering mica from molybdenum tailings, the process flow of which is as follows: Figure 1 As shown.

[0102] In this embodiment, a molybdenum tailings deposit from Luanchuan, Henan Province was used, containing 53% quartz, 18% potassium feldspar, 16% plagioclase, 7% mica, 1.5% diopside, 1% amphibole, and 3.5% other minerals.

[0103] Step 1: Prepare a slurry with a mass fraction of 55% using molybdenum tailings and water, and transfer it to a ball mill for grinding to obtain a slurry with a particle size of -0.074mm accounting for 83.15%.

[0104] Step 2: Pour the ground slurry into the flotation machine, control the slurry concentration to 35%, and adjust the slurry pH to 9.0;

[0105] Step 3: Add 250g / t of oxalic acid to the slurry and stir for 3 minutes;

[0106] Step 3: Add 180 g / t of mixed collector to the slurry. The molar ratio of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in the mixed collector is 1:2. Stir for 3 min.

[0107] Step 4: Aerate the slurry and float for 4 minutes. Collect the flotation foam product to obtain mica concentrate, dry it, weigh it, and test it.

[0108] Test results showed that the yield of mica concentrate was 41.4%, the mica content was 9.1%, and the mica recovery rate was 53.8%.

[0109] By comparing Example 1 and Comparative Example 1, it can be seen that when the same mixed ore of muscovite, albite and quartz is subjected to a single flotation operation, using only octadecyl dimethyl benzyl ammonium chloride as the collector, the muscovite content in the mica concentrate is 30.4%, which is lower than the muscovite content (87.7%) of the mixed collector composed of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in a molar ratio of 1:3.

[0110] By comparing Implementation Case 2 and Comparative Example 2, it can be seen that when the same mixed ore of muscovite, albite and quartz is subjected to a single flotation operation, using only sodium oleate as the collector, the muscovite content in the mica concentrate is 11.6%, which is lower than the muscovite content (81.9%) of the mixed collector composed of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in a molar ratio of 1:2.5.

[0111] By comparing Implementation Case 3 and Comparative Example 3, it can be seen that for the same grinding fineness and the same type of molybdenum tailings, a single flotation operation using a mixed collector consisting of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in a molar ratio of 1:3.5 yielded a mica concentrate with a mica content of 21.2% and a mica recovery of 74.5%. However, flotation using a mixed collector consisting of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in a molar ratio of 1:2 yielded a mica concentrate with a mica content of 9.1% and a mica recovery of 53.8%.

[0112] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for recovering mica from molybdenum tailings, characterized in that: Includes the following steps: Step 1: Prepare a slurry with a mass fraction of 50-65% using molybdenum tailings and water, and transfer it to a ball mill for grinding to obtain a slurry with 80-90% of particles of -0.074mm size. Step 2: Pour the ground slurry into the flotation machine, control the slurry concentration to 20-35%, and adjust the slurry pH to 8.0-10.0; Step 3: Add 150-250 g / t of oxalic acid to the slurry from Step 2 as a gangue mineral inhibitor, and stir for 3 minutes; Step 4: Add 150-300 g / t of mixed collector to the slurry from Step 3. The molar ratio of octadecyl dimethyl benzyl ammonium chloride and sodium oleate in the mixed collector is 1:2.5-1:4.

5. Stir for 3 min. Step 5: Aerate the slurry from Step 4 for roughing flotation for 4 minutes, and collect the flotation froth product to obtain the roughing concentrate and the product at the bottom of the flotation cell; Step 6: Add 50-100g / t of oxalic acid and 80-200g / t of mixed collector to the product at the bottom of the flotation cell in Step 5. Stir for 3 minutes, then aerate and perform scavenging. Collect the frothy product to obtain middlings 1, and the slurry product at the bottom of the flotation cell to obtain the final tailings. Step 7: Perform 3-5 more cleaning operations on the roughing concentrate from Step 5. No flotation reagents are added in the first cleaning operation. 50-150g / t of mixed collector is added in the second cleaning operation. No collector is added in the third cleaning operation. No collector is added in subsequent cleaning operations. The feed for each cleaning operation is the froth product from the previous cleaning operation. The slurry product from the bottom of the flotation cell in each cleaning operation is returned to the previous cleaning operation. The slurry from the bottom of the flotation cell in the first cleaning operation and the ore 1 from the scavenging operation are combined and returned to the roughing operation. The froth product collected in the last cleaning operation is the final mica concentrate.

2. The method for recovering mica from molybdenum tailings according to claim 1, characterized in that: The dosage of the mixed collector in the roughing operation is 150-300 g / t, and the dosage of the mixed collector in the scavenging operation is 80-200 g / t. No collector is added in the first cleaning operation, and 50-150 g / t of mixed collector is added in the second cleaning operation. No collector is added in subsequent cleaning operations.

3. The method for recovering mica from molybdenum tailings according to claim 1, characterized in that: Oxalic acid is used as a gangue mineral inhibitor. The dosage of oxalic acid in the roughing operation is 150-250 g / t, and the dosage of oxalic acid in the scavenging operation is 50-100 g / t.

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