Method for comprehensive recovery of tantalum, niobium and tin from lithium mica flotation tailings

Abstract

The application provides a method for comprehensively recovering tantalum, niobium and tin from lithium mica flotation tailings, and relates to the technical field of comprehensive utilization of resources. The method first classifies the lithium mica tailings, and performs flotation on the particle size less than 0.038 mm to obtain a low-grade tantalum, niobium and tin concentrate; the particle size of +0.038-0.15 mm is subjected to gravity separation, centrifugal separation and table separation to obtain a high-grade tantalum, niobium and tin concentrate; and the particle size greater than 0.15 mm is subjected to gravity separation, and then regrinding, and the grinding product returns to the initial classification operation. The method is environmentally friendly, can effectively utilize the lithium mica flotation tailings, and solves the problem of low recovery rate of tantalum, niobium and tin.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resource comprehensive utilization, in particular to a method for comprehensive recovery of tantalum, niobium and tin from lepidolite flotation tailings. BACKGROUND

[0002] With the development of mineral processing, the accumulation of tailings is becoming more and more common, and the tailings contain rich metal and non-metallic mineral resources, which have not been effectively utilized. The accumulated tailings not only cause waste of resources, but also have great harm to the natural environment.

[0003] Lepidolite flotation tailings contain a large amount of valuable metal elements, and at present, lepidolite flotation tailings are mostly directly accumulated, and some are used for building materials after high-value elements are extracted, and finally green backfilling, but the present research does not involve the recovery of tantalum, niobium and tin in the tailings. With the rapid development of modern industry and high-tech, the demand for tantalum, niobium and tin and their products is increasing, and tantalum, niobium and tin belong to rare metals, and the mineral resources are relatively scarce. In recent years, the demand for tantalum, niobium and tin is strong, and the resources of tantalum, niobium and tin are very scarce. The lepidolite concentrate is rich in high-quality tantalum, niobium and tin and other rare metals. According to the test report, the average tantalum grade of lepidolite raw ore is only 0.014%, and general mineral processing relies on re-election after grinding to recover the coarsely dissociated tantalum, niobium and tin through spiral chute and shaking table, but due to the flaky structure and soft texture of lepidolite, a large amount of tantalum, niobium and tin closely associated with mica cannot be recovered due to insufficient dissociation, resulting in a tantalum, niobium and tin recovery rate of less than 25%, and a very low mineral processing efficiency.

[0004] Therefore, in order to solve the problems of lepidolite flotation tailings accumulation and effective recovery of tantalum, niobium and tin, the present application researches a new and convenient method for recovering tantalum, niobium and tin from lepidolite flotation tailings. SUMMARY

[0005] In order to solve the above technical problems existing in the prior art, the present application provides a method for comprehensive recovery of tantalum, niobium and tin from lepidolite flotation tailings. The technical solution is as follows:

[0006] A method for comprehensive recovery of tantalum, niobium and tin from lepidolite flotation tailings, the method comprising:

[0007] S1, grading the lepidolite flotation tailings to obtain three particle sizes of -0.038mm, -0.15+0.038mm and +0.15mm;

[0008] S2, floating the -0.038mm particle size obtained in step S1 to obtain a low-grade tantalum, niobium and tin concentrate;

[0009] S3, reselecting the -0.15+0.038 mm size fraction obtained in step S1 to obtain a reselected concentrate;

[0010] S4, centrifugally sorting the reselected concentrate obtained in step S3, and obtaining a high-grade tantalum-niobium-tin concentrate after shaking table sorting of the centrifugally sorted concentrate;

[0011] S5, reselecting the +0.15 mm size fraction obtained in step S1, and returning the reselected concentrate after regrinding to the step S1 for classification operation.

[0012] In the lithium mica flotation tailings in the step S1, the Ta2O5 grade is 0.003-0.01%, the Nb2O5 grade is 0.003-0.01%, and the SnO2 grade is 0.03-0.3%, and the particle size of -0.074 mm is more than 40%.

[0013] The flotation process in the step S2 is: the flotation slurry concentration is 10-20%, and a low-grade tantalum-niobium-tin concentrate is obtained after one roughing, three scavenging and three cleaning.

[0014] The roughing reagent system is: the water glass dosage is 500-1000 g / t, the sodium carbonate dosage is 500-1000 g / t, the collector is a mixture of o-aminobenzoic acid cinnamate and bis(1,3-propanediamine) copper chloride in a mass ratio of 1:1, and the dosage is 100-500 g / t.

[0015] The scavenging reagent dosage is 1 / 3 of the roughing reagent dosage, and the reagent dosages for the second and third scavenging are each 1 / 4 of the roughing reagent dosage.

[0016] The cleaning reagent system is: only water glass is added for cleaning, the water glass dosage for the first cleaning is 100-200 g / t, and the water glass dosages for the second and third cleanings are each 50-100 g / t.

[0017] During the flotation, the stirring speed of the flotation machine is 2000-3000 rpm, the stirring time of the water glass and sodium carbonate reagents is 30-60 min, and the stirring time of the collector is 10-20 min.

[0018] In the low-grade tantalum-niobium-tin concentrate obtained in the step S2, the Ta2O5 grade is 3-6%, the recovery rate is 20-30%, the Nb2O5 grade is 3-6%, the recovery rate is 20-30%, and the SnO2 grade is 5-10%, the recovery rate is 25-35%.

[0019] The reselection in the steps S3 and S5 uses one of a spiral chute or a cloth chute, and the feed concentration is 15-25%.

[0020] The step S4 adopts a continuous vertical centrifugal separator, the ore concentration is 10-20%, the centrifugal speed is 200-300 rpm, the backflush water pressure is 0.2-0.3 MPa, and the ore feeding amount is 25-30 t / h.

[0021] In the high-grade tantalum-niobium-tin concentrate obtained in the step S4, the Ta2O5 grade is 10-20%, the recovery rate is 50-60%, the Nb2O5 grade is 10-20%, the recovery rate is 50-60%, and the SnO2 grade is 5-10%, the recovery rate is 40-60%.

[0022] In the step S5, the grinding concentration is 25-35%, and the grinding fineness is 100% of -0.15 mm.

[0023] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0024] In the above scheme, the process of first grading and then sorting can realize the recovery of tantalum-niobium-tin narrow particle size, avoid the problem of high loss of valuable metals due to different particle sizes, and improve the recovery rate of tantalum-niobium-tin; moreover, the new type of collector cinnamyl anthranilate and copper bis(1,3-propanediamine) chloride are used to float tantalum-niobium-tin minerals, which can realize efficient flotation of micro-fine tantalum-niobium-tin, improve the enrichment ratio and recovery rate of micro-fine tantalum-niobium-tin; in addition, the continuous centrifugal concentrator is used to sort the gravity separation concentrate, the continuous centrifugal concentrator has large processing capacity and high enrichment ratio, compared with the traditional process of directly feeding the gravity separation concentrate into a table concentrator, the process has large processing capacity, which can greatly reduce the number of table concentrators, thereby reducing the production floor area.

[0025] The process of grading-flotation recovery of micro-fine tantalum-niobium, step-by-step gravity separation recovery of intermediate particle size tantalum-niobium, and regrinding and re-sorting of coarse particles can realize efficient recovery of low-grade tantalum-niobium-tin in lepidolite flotation tailings, the comprehensive recovery rate of Ta2O5 is 60-80%, the comprehensive recovery rate of Nb2O5 is 60-80%, and the comprehensive recovery rate of SnO2 is 70-90%, solving the problem of low recovery rate of tantalum-niobium-tin. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 It is a method flow chart for comprehensive recovery of tantalum-niobium-tin in lepidolite flotation tailings provided by the embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the present application will be described below with reference to the drawings.

[0029] In the embodiments of the present application, the words such as "example", "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "example" is intended to present the concept in a specific manner. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be one of the two.

[0030] In the embodiments of the present application, sometimes the subscript such as W1 can be written in the form of non-subscript such as W1, and the meanings expressed thereby are consistent when the difference is not emphasized.

[0031] To make the technical problems, technical solutions and advantages to be solved by the present application more clear, the following will be described in detail with reference to the drawings and specific embodiments.

[0032] The embodiments of the present application provide a method for comprehensive recovery of tantalum, niobium and tin from lepidolite flotation tailings. Figure 1 As shown in the flow chart of the method for comprehensive recovery of tantalum, niobium and tin from lepidolite flotation tailings, the method can include the following steps:

[0033] S1, grading the lepidolite flotation tailings to obtain three particle sizes of -0.038 mm, -0.15+0.038 mm and +0.15 mm;

[0034] S2, floating the -0.038 mm particle size obtained in step S1 to obtain a low-grade tantalum, niobium and tin concentrate;

[0035] S3, gravity separating the -0.15+0.038 mm particle size obtained in step S1 to obtain a gravity concentrate;

[0036] S4, centrifugal sorting the gravity concentrate obtained in step S3, and after the centrifugal sorting, the concentrate is sorted by a shaking table to obtain a high-grade tantalum, niobium and tin concentrate;

[0037] S5, gravity separating the +0.15 mm particle size obtained in step S1, and returning the gravity concentrate after regrinding to the grading operation in step S1.

[0038] The following will be described with reference to specific embodiments.

[0039] Embodiment 1

[0040] In this embodiment, the lepidolite flotation tailings selected have a Ta2O5 grade of about 0.006%, a Nb2O5 grade of about 0.008%, a SnO2 grade of about 0.15%, and a particle size of -0.074 mm of more than 40%.

[0041] As Figure 1 , first, the lithium mica flotation tailings are classified to obtain three particle sizes of -0.038 mm, -0.15+0.038 mm and +0.15 mm.

[0042] Then, the -0.038 mm particle size is subjected to flotation, and a roughing-three-cleaning-three-scavenging flotation operation is adopted to obtain a flotation concentrate (i.e., a low-grade TaNbSn concentrate) and a tailing. In the primary roughing, the water glass dosage is 800 g / t, the sodium carbonate dosage is 800 g / t, the collector is a mixture of o-aminobenzoic acid cinnamate and bis(1,3-propanediamine) copper chloride at a mass ratio of 1:1, and the dosage is 300 g / t.

[0043] In the primary scavenging, the dosages of water glass, sodium carbonate and collector are 1 / 3 of those in the primary roughing. In the secondary scavenging and the tertiary scavenging, the dosages of water glass, sodium carbonate and collector are 1 / 4 of those in the primary roughing.

[0044] In the cleaning, only water glass is added. The water glass dosage in the primary cleaning is 100 g / t, and the water glass dosages in the secondary cleaning and the tertiary cleaning are both 50 g / t.

[0045] In the low-grade TaNbSn concentrate obtained by flotation, the Ta2O5 grade is 4.2%, the recovery rate is 25.8%, the Nb2O5 grade is 4.3%, the recovery rate is 25.4%, and the SnO2 grade is 7.1%, the recovery rate is 30.1%.

[0046] The -0.15+0.038 mm particle size is subjected to gravity separation using a spiral chute, and the gravity separation feed concentration is 18%.

[0047] The gravity separation concentrate is further subjected to centrifugal separation. After the centrifugal separation, the concentrate is subjected to table gravity separation to obtain a high-grade TaNbSn concentrate. In the obtained high-grade TaNbSn concentrate, the Ta2O5 grade is 16.8%, the recovery rate is 56.6%, the Nb2O5 grade is 16.7%, the recovery rate is 55.2%, and the SnO2 grade is 6.4%, the recovery rate is 55.4%.

[0048] In the centrifugal separation, the feed concentration is about 16%, the centrifuge speed is 240 rpm, the backflush water pressure is 0.25 MPa, and the feed amount is about 26 t / h. Tap water is used as much as possible, and the water cannot contain obvious suspended matter, precipitate and particles. Because poor water quality may block the backflush water holes and affect the normal work of the flowmeter.

[0049] The +0.15 mm fraction is subjected to gravity separation using a cloth chute, and the gravity separation concentrate is ground again and returned to the initial classification operation. The grinding concentration is about 27%, and the grinding fineness is 100% -0.15 mm.

[0050] In the above process, the tailings obtained are combined and subjected to subsequent treatment, and the two TaNbSn concentrates obtained are combined as the final TaNbSn concentrate.

[0051] Example 2

[0052] In this example, the lithium mica flotation tailings selected have a Ta2O5 grade of about 0.004%, a Nb2O5 grade of 0.003%, and a SnO2 grade of about 0.05%, with a particle size of -0.074 mm accounting for more than 40%.

[0053] As Figure 1 , first, the lithium mica flotation tailings are classified to obtain -0.038 mm, -0.15+0.038 mm and +0.15 mm fractions.

[0054] Then, the -0.038 mm fraction is subjected to flotation using a one-roughing-three-cleaning-three-scavenging flotation operation to obtain a flotation concentrate (i.e., a low-grade TaNbSn concentrate) and a tailing. In the first roughing, the water glass dosage is 1000 g / t, the sodium carbonate dosage is 900 g / t, the collector is a mixture of o-aminobenzoic acid cinnamate and bis(1,3-propanediamine) copper chloride at a mass ratio of 1:1, and the dosage is 500 g / t.

[0055] In the first scavenging, the dosages of water glass, sodium carbonate and collector are 1 / 3 of those in the first roughing, and in the second and third scavengings, the dosages of water glass, sodium carbonate and collector are 1 / 4 of those in the first roughing.

[0056] Only water glass is added in the cleaning, and the water glass dosage in the first cleaning is 200 g / t, and the water glass dosages in the second and third cleanings are both 100 g / t.

[0057] In the low-grade TaNbSn concentrate obtained by flotation, the Ta2O5 grade is 3.9%, the recovery rate is 26.9%, the Nb2O5 grade is 4.9%, the recovery rate is 27.3%, and the SnO2 grade is 8.2%, the recovery rate is 28.7%.

[0058] The -0.15+0.038 mm fraction is subjected to gravity separation using a spiral chute, and the gravity separation concentrate is ground again and returned to the initial classification operation. The grinding concentration is about 27%, and the grinding fineness is 100% -0.15 mm.

[0059] The reselected concentrate is further subjected to centrifugal separation. After the centrifugal separation, the concentrate is subjected to table reselection to obtain high-grade TaNbSn concentrate. In the obtained high-grade TaNbSn concentrate, the Ta2O5 grade is 17.2%, and the recovery rate is 57.6%; the Nb2O5 grade is 17.1%, and the recovery rate is 56.4%; and the SnO2 grade is 7.1%, and the recovery rate is 56.3%.

[0060] In the centrifugal separation, the feed concentration is about 16%, the centrifuge speed is 280 rpm, the backflush water pressure is 0.28 MPa, and the feed amount is about 28 t / h. Tap water is used as far as possible, and the water cannot contain obvious suspended matter, precipitate and particles, because poor water quality may block the backflush water hole and affect the normal work of the flowmeter.

[0061] The +0.15 mm size fraction is subjected to reselection by means of a cloth apron chute, and the reselected concentrate is returned to the initial classification operation after being ground again. In the grinding, the grinding concentration is about 30%, and the grinding fineness of-0.15 mm is 100%.

[0062] In the above process, the tailings obtained are combined and subjected to subsequent treatment, and the two times of TaNbSn concentrate obtained are combined as the final TaNbSn concentrate.

[0063] Example 3

[0064] In this example, the lithium mica flotation tailings selected have a Ta2O5 grade of about 0.007%, a Nb2O5 grade of about 0.005%, and a SnO2 grade of about 0.1%, and the particle size of-0.074 mm is more than 40%.

[0065] As shown in Figure 1 , first, the lithium mica flotation tailings are classified to obtain-0.038 mm, -0.15+0.038 mm and +0.15 mm size fractions.

[0066] Then, the-0.038 mm size fraction is subjected to flotation by adopting a one-roughing-three-cleaning-three-scavenging flotation operation to obtain flotation concentrate (i.e. low-grade TaNbSn concentrate) and tailings. In the primary roughing, the water glass dosage is 700 g / t, the sodium carbonate dosage is 850 g / t, the collector is a mixture of o-aminobenzoic acid cinnamate and bis(1,3-propanediamine) copper chloride in a mass ratio of 1:1, and the dosage is 250 g / t.

[0067] In the primary scavenging, the dosages of water glass, sodium carbonate and collector are 1 / 3 of those in the primary roughing, and in the secondary scavenging and the tertiary scavenging, the dosages of water glass, sodium carbonate and collector are 1 / 4 of those in the primary roughing.

[0068] The water glass is added only in the selective separation, the amount of water glass in the first selective separation is 120 g / t, and the amount of water glass in the second and third selective separation is 60 g / t.

[0069] In the low-grade TaNbSn concentrate obtained by flotation, the Ta2O5 grade is 4.3%, the recovery rate is 26.8%, the Nb2O5 grade is 4.6%, the recovery rate is 24.4%, and the SnO2 grade is 6.8%, the recovery rate is 31.1%.

[0070] The-0.15+0.038mm size fraction is subjected to gravity separation by a spiral chute, and the gravity separation feed concentration is 18%.

[0071] The gravity separation concentrate is further subjected to centrifugal separation, and after the centrifugal separation, the concentrate is subjected to table gravity separation, thereby obtaining high-grade TaNbSn concentrate, in which the Ta2O5 grade is 18.0%, the recovery rate is 54.6%, the Nb2O5 grade is 15.7%, the recovery rate is 56.2%, and the SnO2 grade is 6.8%, the recovery rate is 55.3%.

[0072] In the centrifugal separation, the feed concentration is about 16%, the centrifuge speed is 220 rpm, the backflush water pressure is 0.23 MPa, and the feed amount is about 27 t / h. Tap water is used as much as possible, and the water cannot contain obvious suspended matter, precipitate and particles, because poor water quality may block the backflush water hole and affect the normal work of the flowmeter.

[0073] The +0.15mm size fraction is subjected to gravity separation by a cloth chute, and the gravity separation concentrate is again subjected to grinding and then returned to the initial classification operation. In the grinding operation, the grinding concentration is about 27%, and the grinding fineness is-0.15mm, accounting for 100%.

[0074] In the above process, the tailings obtained are combined and subjected to subsequent treatment, and the two TaNbSn concentrates obtained are combined as the final TaNbSn concentrate.

[0075] Example 4

[0076] In this example, the lithium mica flotation tailings selected have a Ta2O5 grade of about 0.01%, a Nb2O5 grade of about 0.009%, and a SnO2 grade of about 0.25%, and the particle size is-0.074mm, accounting for more than 40%.

[0077] As Figure 1 , first, the lithium mica flotation tailings are classified to obtain-0.038mm, -0.15+0.038mm and +0.15mm size fractions.

[0078] Then the -0.038 mm size fraction is subjected to flotation, using a one roughing-three cleaning-three scavenging flotation operation, to obtain a flotation concentrate (i.e. a low-grade TaNbSn concentrate) and a tailing, wherein in the first roughing, the water glass dosage is 680 g / t, the sodium carbonate dosage is 680 g / t, the collector is a mixture of o-aminobenzoic acid cinnamate and bis(1,3-propanediamine) copper chloride in a mass ratio of 1:1, and the dosage is 350 g / t;

[0079] In the first scavenging, the dosages of water glass, sodium carbonate and collector are all 1 / 3 of those in the first roughing, and in the second and third scavengings, the dosages of water glass, sodium carbonate and collector are all 1 / 4 of those in the first roughing.

[0080] In the cleaning, only water glass is added, the water glass dosage in the first cleaning is 160 g / t, and the water glass dosages in the second and third cleanings are both 80 g / t.

[0081] In the low-grade TaNbSn concentrate obtained by flotation, the Ta2O5 grade is 4.4%, the recovery rate is 26.8%, the Nb2O5 grade is 4.6%, the recovery rate is 27.4%, and the SnO2 grade is 9.1%, the recovery rate is 31.1%.

[0082] The -0.15+0.038 mm size fraction is subjected to gravity separation using a spiral chute, and the gravity separation feed concentration is 18%.

[0083] The gravity separation concentrate is further subjected to centrifugal separation, and after the centrifugal separation, the concentrate is subjected to table gravity separation, to obtain a high-grade TaNbSn concentrate, wherein in the high-grade TaNbSn concentrate, the Ta2O5 grade is 16.6%, the recovery rate is 55.6%, the Nb2O5 grade is 15.7%, the recovery rate is 56.2%, and the SnO2 grade is 8.4%, the recovery rate is 52.4%.

[0084] In the centrifugal separation, the LX-60 cyclone centrifuge tester is used, the feed concentration is about 16%, the centrifuge speed is 270 rpm, the backflush water pressure is 0.25 MPa, and the feed amount is about 26 t / h. Tap water is used as much as possible, and the water cannot contain obvious suspended matter, precipitate and particles, because poor water quality may block the backflush water holes and affect the normal work of the flowmeter.

[0085] The +0.15 mm size fraction is subjected to gravity separation using a blanket chute, and the gravity separation concentrate is again subjected to grinding and then returned to the initial classification operation. In the grinding, the grinding concentration is about 27%, and the grinding fineness is -0.15 mm, accounting for 100%.

[0086] In the above process, the tailings obtained are combined and subjected to subsequent treatment, and the two TaNbSn concentrates obtained are combined to serve as the final TaNbSn concentrate.

[0087] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for the comprehensive recovery of tantalum, niobium, and tin from lepidolite flotation tailings, characterized in that, The method includes: S1. The lepidolite flotation tailings are classified to obtain three particle sizes: -0.038mm, -0.15 +0.038mm, and +0.15mm. S2. The -0.038mm particle size obtained in step S1 is subjected to flotation to obtain low-grade tantalum-niobium-tin concentrate; S3. The -0.15 +0.038 mm particle size obtained in step S1 is subjected to gravity separation to obtain gravity concentrate; S4. The gravity concentrate obtained in step S3 is centrifuged and then separated by a shaking table to obtain high-grade tantalum-niobium-tin concentrate. S5. The +0.15mm particle size obtained in step S1 is subjected to re-separation. The re-separated concentrate is then ground again and returned to the classification operation in step S1. The flotation process in step S2 is as follows: with a flotation concentration of 10-20%, a low-grade tantalum-niobium-tin concentrate is obtained by one roughing, three scavenging, and three cleaning processes. The primary roughing reagent system is as follows: water glass dosage is 500-1000 g / t, sodium carbonate dosage is 500-1000 g / t, and the collector is anthranilate and bis(1,3-propanediamine)copper chloride mixed in a mass ratio of 1:1, with a dosage of 100-500 g / t. The amount of reagent used in the first scavenging is 1 / 3 of that used in the first roughing, and the amount of reagent used in the second and third scavenging is 1 / 4 of that used in the first roughing. The purification process is as follows: only water glass is added for purification. The amount of water glass used for the first purification is 100-200 g / t, and the amount of water glass used for the second and third purifications is 50-100 g / t.

2. The method for comprehensive recovery of tantalum, niobium, and tin from lithium mica flotation tailings according to claim 1, characterized in that, In step S1, the lepidolite flotation tailings contain Ta2O5 grade of 0.003–0.01%, Nb2O5 grade of 0.003–0.01%, SnO2 grade of 0.03–0.3%, and particles with a size of -0.074 mm account for more than 40%.

3. The method for comprehensive recovery of tantalum, niobium, and tin from lepidolite flotation tailings according to claim 1, characterized in that, During the flotation process, the flotation machine is stirred at a speed of 2000-3000 rpm, the water glass and sodium carbonate reagents are stirred for 30-60 minutes, and the collector is stirred for 10-20 minutes.

4. The method for comprehensive recovery of tantalum, niobium, and tin from lithium mica flotation tailings according to claim 1, characterized in that, In the low-grade tantalum-niobium-tin concentrate obtained in step S2, the Ta2O5 grade is 3-6% with a recovery rate of 20-30%, the Nb2O5 grade is 3-6% with a recovery rate of 20-30%, and the SnO2 grade is 5-10% with a recovery rate of 25-35%.

5. The method for comprehensive recovery of tantalum, niobium, and tin from lithium mica flotation tailings according to claim 1, characterized in that, In steps S3 and S5, gravity separation is performed using either a spiral chute or a cloth chute, with a feed concentration of 15-25%.

6. The method for comprehensive recovery of tantalum, niobium, and tin from lithium mica flotation tailings according to claim 1, characterized in that, In step S4, the centrifugal separation adopts a continuous vertical centrifugal separator with a feed concentration of 10-20%, a centrifuge speed of 200-300 rpm, a backwash water pressure of 0.2-0.3 MPa, and a feed rate of 25-30 t / h.

7. The method for comprehensive recovery of tantalum, niobium, and tin from lithium mica flotation tailings according to claim 1, characterized in that, In the high-grade tantalum-niobium-tin concentrate obtained in step S4, the Ta2O5 grade is 10-20% with a recovery rate of 50-60%, the Nb2O5 grade is 10-20% with a recovery rate of 50-60%, and the SnO2 grade is 5-10% with a recovery rate of 40-60%.

8. The method for comprehensive recovery of tantalum, niobium, and tin from lithium mica flotation tailings according to claim 1, characterized in that, In step S5, the grinding concentration is 25-35%, and the grinding fineness is -0.15 mm, accounting for 100%.

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