Low-grade difficult-to-treat lepidolite beneficiation system

Abstract

The utility model discloses a low-grade difficult-to-treat lepidolite beneficiation system which comprises a crushing device, a crushing and grading device, an ore grinding device, an ore grinding and grading device and a gravity concentration device, an upper-level outlet of the crushing device is communicated with a lower-level inlet of the crushing and grading device in sequence, and two outlets of the gravity concentration device are respectively communicated with a desliming device and a tantalum-niobium-tin concentrate outlet. Two outlets of the desliming equipment are respectively communicated with tail mud dehydration equipment and flotation equipment, and two outlets of the flotation equipment are respectively communicated with lepidolite concentrate dehydration equipment and feldspar concentrate dehydration equipment. Therefore, three products of lepidolite concentrate, tantalum tin concentrate and feldspar concentrate can be obtained through sorting of the system, all the products can generate economic benefits, and the mineral separation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ore dressing, especially to a low-grade difficult-to-treat lepidolite ore dressing system. BACKGROUND

[0002] At present, the granite type lithium ore deposit region exploited and utilized in China is mainly located in Yichun, Jiangxi, which is also the largest associated lepidolite deposit in the world. When the lepidolite content is high, the structure of the ore is fine flaky and the ore is fine; if the content is low, the ore structure is coarse flaky and the ore is coarse, the low-grade lepidolite granite is difficult to be separated, and it contains multiple rare metals such as lithium, tantalum, niobium and tin, and multiple non-metallic minerals such as feldspar and quartz. The low-grade lepidolite ore has the characteristics of fine-grained dissemination and easy argillization, so its separation is extremely difficult and the ore dressing efficiency is low. SUMMARY

[0003] To solve the technical problems in the background art, the utility model provides a low-grade difficult-to-treat lepidolite ore dressing system.

[0004] The low-grade difficult-to-treat lepidolite ore dressing system provided by the utility model comprises a crushing device, a crushing and grading device, a grinding device, a grinding and grading device and a gravity separation device which are sequentially communicated with the upper outlet and the lower inlet, two outlets of the gravity separation device are respectively communicated with a desliming device and a tantalum-niobium-tin concentrate outlet, two outlets of the desliming device are respectively communicated with a tailing dewatering device and a flotation device, and two outlets of the flotation device are respectively communicated with a lepidolite concentrate dewatering device and a feldspar concentrate dewatering device.

[0005] Preferably, the crushing device comprises a jaw crusher, a medium crushing cone crusher and a fine crushing cone crusher, the discharge port of the jaw crusher is connected with the feeding port of the medium crushing cone crusher through a belt, the discharge port of the medium crushing cone crusher is connected with the feeding port of the fine crushing cone crusher, the crushing and grading device is a circular vibrating screen, the medium crushing cone crusher and the fine crushing cone crusher are connected with the circular vibrating screen, the unqualified material on the upper layer screen of the circular vibrating screen is returned to the medium crushing cone crusher through a belt for further crushing, the unqualified material on the lower layer screen of the circular vibrating screen is fed into the fine crushing cone crusher for further crushing, and the qualified material under the screen is transported to a fine ore bin through a belt.

[0006] Preferably, a pre-milling screening device is further arranged between the crushing and grading device and the grinding device, the fine ore bin is connected with the pre-milling screening device, the pre-milling screening device is a linear vibrating screen, the grinding device is a ball mill, the linear vibrating screen is connected with the ball mill, the ball mill is connected with the grinding and grading device through a pipeline, the grinding and grading device comprises a spiral classifier and a high-frequency fine screen, the linear vibrating screen is connected with the spiral classifier, the material on the screen of the linear vibrating screen enters the ball mill, the material under the screen of the linear vibrating screen enters the spiral classifier together with the discharge of the ball mill, the sand of the spiral classifier returns to the ball mill for further grinding, the overflow enters the high-frequency fine screen for inspection and screening, the material on the screen of the high-frequency fine screen returns to the ball mill, and the material under the screen enters a wet-type permanent-magnetic cylinder-type low-intensity magnetic separator and then enters a gravity separation device after iron removal.

[0007] Preferably, the material after iron removal enters the gravity separation device to recover tantalum-niobium-tin through a tantalum-niobium-tin concentrate outlet, the gravity separation device comprises a roughing cloth chute, a scavenging cloth chute, a cleaning table and a scavenging table, the material under the high-frequency fine screen is fed into a feed inlet of the roughing cloth chute after iron removal, a concentrate discharge outlet of the roughing cloth chute is connected with a feed inlet of the cleaning table, and a tailings discharge outlet is connected with a feed inlet of the scavenging cloth chute; a concentrate discharge outlet of the scavenging cloth chute is connected with a feed inlet of the cleaning table, and a tailings discharge outlet is connected with a feed inlet of a desliming device; a concentrate discharge outlet of the cleaning table outputs tantalum-niobium-tin concentrate, a tailings discharge outlet is connected with a feed inlet of the roughing cloth chute, and a middlings discharge outlet is connected with a feed inlet of the scavenging table; a concentrate discharge outlet of the scavenging table outputs tantalum-niobium-tin concentrate, and a middlings discharge outlet is connected with a feed inlet of the roughing cloth chute, so that tantalum-niobium-tin not selected in the middlings is further recovered.

[0008] Preferably, the desliming device comprises a first desliming hydrocyclone and a second desliming hydrocyclone, a tailings discharge outlet of the scavenging cloth chute is connected with a feed inlet of the first desliming hydrocyclone, a bottom flow outlet is connected with a feed inlet of a flotation device, and an overflow outlet is connected with a feed inlet of the second desliming hydrocyclone; a bottom flow outlet of the second desliming hydrocyclone is connected with a feed inlet of the flotation device, and an overflow outlet enters a thickener after thickening and then enters a tailings dewatering device for multi-stage dewatering, the tailings dewatering device is a plate-and-frame filter press, and the overflow of the first desliming hydrocyclone enters the second desliming hydrocyclone; the material after desliming enters the flotation device, and lithium mica concentrate is obtained through flotation.

[0009] Preferably, the flotation device comprises a roughing flotation machine, a cleaning 1 flotation machine, a cleaning 2 flotation machine, a cleaning 3 flotation machine, a scavenging 1 flotation machine and a scavenging 2 flotation machine; the feed inlet of the roughing flotation machine is connected with the underflow outlet of the first desliming hydrocyclone and the second desliming hydrocyclone, and is used for preliminary flotation enrichment of qualified materials; the feed inlet of the cleaning 1 flotation machine is connected with the concentrate outlet of the roughing flotation machine, and the tailing discharge outlet is connected with the feed inlet of the roughing flotation machine, so as to return the roughing flotation machine to further recover the lithium mica in the ore pulp; the feed inlet of the cleaning 2 flotation machine is connected with the concentrate discharge outlet of the cleaning 1 flotation machine, and the tailing discharge outlet is connected with the feed inlet of the cleaning 1 flotation machine, so that the tailings of the cleaning 2 flotation machine are returned to the cleaning 1 flotation machine for further separation; the concentrate discharge outlet of the cleaning 2 flotation machine is connected with the feed inlet of the cleaning 3 flotation machine, the tailing discharge outlet of the cleaning 3 flotation machine is connected with the feed inlet of the cleaning 2 flotation machine, and the concentrate discharge outlet is connected with the feed inlet of the lithium mica concentrate dewatering device.

[0010] Preferably, the tailing discharge outlet of the roughing flotation machine is connected with the feed inlet of the scavenging 1 flotation machine, and the concentrate of the scavenging 1 flotation machine is returned to the roughing flotation machine; the feed inlet of the scavenging 2 flotation machine is connected with the tailing discharge outlet of the scavenging 1 flotation machine, and the tailing discharge outlet is connected with the feldspar concentrate dewatering device.

[0011] In summary, the low-grade and difficult-to-treat lithium mica beneficiation system has the following beneficial effects: the ore dressing treatment is performed through the crushing device, the crushing and grading device, the grinding device, the grinding and grading device, the gravity separation device, the desliming device, the flotation device, the lithium mica concentrate dewatering device, the feldspar concentrate dewatering device and the tailing dewatering device, three products of the lithium mica concentrate, the tantalum tin concentrate and the feldspar concentrate can be obtained through the system separation, all the products can generate economic benefits, and the ore dressing efficiency is improved.

[0012] The additional aspects and advantages of the present application will be given in part in the following description, will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural block diagram of the low-grade and difficult-to-treat lithium mica beneficiation system.

[0014] In the drawings:

[0015] 1, crushing device; 11', jaw crusher; 12, medium crushing cone crusher; 13, fine crushing cone crusher;

[0016] 2, crushing and grading device; 3, pre-milling screening device; 4, grinding device;

[0017] 5, grinding and grading device; 51, spiral classifier; 52, high-frequency fine screen;

[0018] 6, re-election device; 61, rough selection cloth chute; 62, sweep selection cloth chute; 63, fine selection table; 64, sweep selection table;

[0019] 7, desliming device; 71, first stage desliming hydrocyclone; 72, second stage desliming hydrocyclone;

[0020] 8, flotation device; 81, rough selection flotation machine 81; 82, fine selection one flotation machine; 83, fine selection two flotation machine; 84, fine selection three flotation machine; 85, sweep selection one flotation machine; 86, sweep selection two flotation machine;

[0021] 9, lepidolite concentrate dewatering device; 10, feldspar concentrate dewatering device; 11, tailing dewatering device. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar symbols represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0023] As shown in the drawings, Figure 1 The low-grade refractory lepidolite beneficiation system proposed in the embodiment comprises a crushing device 1, a crushing and grading device 2, a grinding device 4, a grinding and grading device 5 and a re-election device 6 which are sequentially communicated with the upper outlet and the lower inlet, two outlets of the re-election device 6 are respectively communicated with a desliming device 7 and a tantalum-niobium-tin concentrate outlet, two outlets of the desliming device 7 are respectively communicated with a tailing dewatering device 11 and a flotation device 8, two outlets of the flotation device 8 are respectively communicated with a lepidolite concentrate dewatering device 9 and a feldspar concentrate dewatering device 10.

[0024] In this way, the beneficiation treatment is carried out through the crushing device 1, the crushing and grading device 2, the grinding device 4, the grinding and grading device 5, the re-election device 6, the desliming device 7, the flotation device 8, the lepidolite concentrate dewatering device 9, the feldspar concentrate dewatering device 10 and the tailing dewatering device 11, and three products of lepidolite concentrate, tantalum-tin concentrate and feldspar concentrate can be obtained through the system, all products can produce economic benefits, and the beneficiation efficiency is improved.

[0025] Further, the crushing device 1 comprises a jaw crusher 11', a medium crushing cone crusher 12 and a fine crushing cone crusher 13, the discharge port of the jaw crusher 11' is connected with the feeding port of the medium crushing cone crusher 12 through a belt, the discharge port of the medium crushing cone crusher 12 is connected with the feeding port of the fine crushing cone crusher 13, the crushing and grading device 2 is a circular vibrating screen, the medium crushing cone crusher 12 and the fine crushing cone crusher 13 are connected with the circular vibrating screen, the unqualified materials on the upper layer screen of the circular vibrating screen are returned to the medium crushing cone crusher 12 for further crushing through a belt, the unqualified materials on the lower layer screen of the circular vibrating screen are returned to the fine crushing cone crusher 13 for further crushing, and the qualified materials under the screens are transported to the fine ore bin through a belt.

[0026] Specifically, the upper layer screen of the circular vibrating screen can be provided with a screen hole specification of 30*30mm, and the lower layer screen can be provided with a screen hole specification of 12*20mm.

[0027] Further, the crushing and grading device 2 and the grinding device 4 are further provided with a pre-milling screening device 3, the fine ore bin is connected with the pre-milling screening device 3, the pre-milling screening device 3 is a linear vibrating screen, the grinding device 4 is a ball mill, the linear vibrating screen is connected with the ball mill, the ball mill is connected with a grinding and grading device 5 through a pipeline, the grinding and grading device 5 comprises a spiral classifier 51 and a high-frequency fine screen 52, the linear vibrating screen is connected with the spiral classifier 51, the materials on the screen of the linear vibrating screen enter the ball mill, and the materials under the screen enter the spiral classifier 51 together with the discharge of the ball mill, the sand of the spiral classifier 51 is returned to the ball mill for further grinding, the overflow enters the high-frequency fine screen 52 for inspection and screening, the materials on the screen of the high-frequency fine screen 52 are returned to the ball mill, the materials under the screen enter a wet-type permanent-magnetic drum-type low-intensity magnetic separator for iron removal and then enter a gravity separation device 6. The crushing materials pass through the grinding device 4 and the grinding and grading device 5 to obtain qualified grinding materials, and the qualified grinding materials are sent to the gravity separation device 6 through a pipeline by a slurry pump.

[0028] Specifically, the size of the ball mill used in the embodiment is Φ4800*6700mm, the single processing capacity is 60-70t / h, and the discharge particle size of the ball mill is 10%-15% of -0.074mm.

[0029] Meanwhile, the high-frequency fine screen is a ten-layer resonance type compound vibrating screen, A=0.40mm, and the particle size of the product under the screen is 45%-50% of -0.074mm.

[0030] In this embodiment, the material after iron removal enters the gravity separation equipment 6 to recover tantalum niobium tin through the tantalum niobium tin concentrate outlet, the gravity separation equipment 6 includes a roughing cloth chute 61, a scavenging cloth chute 62, a concentrating table 63 and a scavenging table 64, the material under the high-frequency fine screen 52 is fed into the roughing cloth chute 61 after iron removal, the concentrate outlet of the roughing cloth chute 61 is connected with the feed inlet of the concentrating table 63, the tailings outlet is connected with the feed inlet of the scavenging cloth chute 62, the concentrate outlet of the scavenging cloth chute 62 is connected with the feed inlet of the concentrating table 63 (for improving the grade of the concentrate output by the cloth chute), the tailings outlet is connected with the feed inlet of the desliming equipment 7, the concentrate outlet of the concentrating table 63 outputs tantalum niobium tin concentrate, the tailings outlet is connected with the feed inlet of the roughing cloth chute 61, and the middlings outlet is connected with the feed inlet of the scavenging table 64, the concentrate outlet of the scavenging table 64 outputs tantalum niobium tin concentrate, the middlings outlet is connected with the feed inlet of the roughing cloth chute 61, and the middlings not selected in the middlings are further recovered.

[0031] Further, the desliming equipment 7 includes a first desliming hydrocyclone 71 and a second desliming hydrocyclone 72, the feed inlet of the first desliming hydrocyclone 71 is connected with the tailings outlet of the scavenging cloth chute 62, the underflow outlet is connected with the feed inlet of the flotation equipment 8, and the overflow outlet is connected with the feed inlet of the second desliming hydrocyclone 72, the underflow outlet of the second desliming hydrocyclone 72 is connected with the feed inlet of the flotation equipment 8, and the overflow enters the thickener for thickening and then enters the tailings dewatering equipment 11 for multi-stage dewatering, the tailings dewatering equipment 11 is a plate-and-frame filter press, and the overflow of the first desliming hydrocyclone 71 enters the second desliming hydrocyclone 72; the material after desliming enters the flotation equipment 8 to obtain lepidolite concentrate through flotation.

[0032] In this way, the gravity separation process is added before the desliming process, which can recover tantalum niobium tin in fine mud and improve the recovery rate of tantalum niobium tin.

[0033] Specifically, the first desliming hydrocyclone 71 is Φ350x12, the second desliming hydrocyclone 72 is Φ150x26, the particle size of the overflow of the first desliming hydrocyclone 71 is greater than 70% of -0.038mm, and the particle size of the overflow of the second desliming hydrocyclone 72 is greater than 95% of -0.038mm. The overflow of the first desliming hydrocyclone 71 is deslimed by the second desliming hydrocyclone 72, which reduces the loss of lepidolite in tailings and improves the recovery rate of lepidolite in flotation, thereby improving the concentrate recovery rate while controlling the beneficiation cost.

[0034] The flotation device 8 comprises a roughing flotation machine 81, a first cleaning flotation machine 82, a second cleaning flotation machine 83, a third cleaning flotation machine 84, a first scavenging flotation machine 85 and a second scavenging flotation machine 86; the feed inlet of the roughing flotation machine 81 is connected with the underflow outlets of the first desliming hydrocyclone 71 and the second desliming hydrocyclone 72, and is used for preliminary flotation enrichment of qualified materials; the feed inlet of the first cleaning flotation machine 82 is connected with the concentrate outlet of the roughing flotation machine 81 (for further processing of the lepidolite rough concentrate selected by the roughing flotation machine 81, and further improving the grade of lepidolite), the tailing discharge outlet is connected with the feed inlet of the roughing flotation machine 81, and the tailing returns to the roughing for further recovery of lepidolite in the ore slurry; the feed inlet of the second cleaning flotation machine 83 is connected with the concentrate discharge outlet of the first cleaning flotation machine 82, and the tailing discharge outlet is connected with the feed inlet of the first cleaning flotation machine 82, the tailing of the second cleaning returns to the first cleaning flotation machine 82 for further selection, the concentrate discharge outlet of the second cleaning flotation machine 83 is connected with the feed inlet of the third cleaning flotation machine 84, and is used for improving the grade of the first cleaning concentrate to reach the final concentrate grade requirement, the tailing discharge outlet of the third cleaning flotation machine 84 is connected with the feed inlet of the second cleaning flotation machine 83, and the concentrate discharge outlet is connected with the feed inlet of the lepidolite concentrate dewatering device 9 for solid-liquid separation to reduce the water content of the lepidolite concentrate to below 15%. In summary, the lepidolite concentrate is obtained through one roughing, three cleanings and two scavengings.

[0035] Further, the tailing discharge outlet of the roughing flotation machine 81 is connected with the feed inlet of the first scavenging flotation machine 85, and is used for further recovery of useful minerals in the tailing; the concentrate selected by the first scavenging flotation machine 85 returns to the roughing flotation machine 81, the feed inlet of the second scavenging flotation machine 86 is connected with the tailing discharge outlet of the first scavenging flotation machine 85 (for reducing the content of lepidolite in the tailing and improving the recovery rate of lepidolite), and the tailing discharge outlet is connected with the feldspar concentrate dewatering device 10. Specifically, the lepidolite concentrate dewatering device 9 and the feldspar concentrate dewatering device 10 are two vacuum belt filter machines with model DU65m 2 / 3200, and the water separated by the dewatering devices is used as the beneficiation backwater, and the beneficiation backwater accounts for 95% of the total water consumption.

[0036] It should be noted that the depressant used in the flotation process is RT-715 combined by inorganic salt and silicate depressant, and the depressant consumption in the whole flotation process is 150-200 g / t. The collector used in the flotation process is a collector combined by amine and fatty acid salt, and the mass of the collector is 100 parts, the amine is 60-70 parts, and the fatty acid is 20-30 parts; wherein the amine is at least one of dodecylamine, cocoylamine and octadecylamine; the fatty acid is at least one of oleic acid, lauric acid and oxidized paraffin soap, and the collector consumption in the whole flotation process is 450-550 g / t.

[0037] In summary, the whole system selection process is: "three closed-circuit crushing, one stage grinding, two times of gravity separation, two stages of desliming, one roughing, three cleanings and two scavengings flotation". Finally, three valuable products of lepidolite concentrate, feldspar concentrate and tantalum-niobium-tin concentrate are output.

[0038] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0039] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0042] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A low-grade refractory lepidolite beneficiation system, comprising a crushing device (1), a crushing and grading device (2), a grinding device (4), a grinding and grading device (5) and a gravity separation device (6) sequentially communicated in turn with the upper outlet and the lower inlet, characterized in that, Two outlets of the reselection device (6) are respectively communicated with a desliming device (7) and a tantalum niobium tin concentrate outlet, two outlets of the desliming device (7) are respectively communicated with a tailing dewatering device (11) and a flotation device (8), two outlets of the flotation device (8) are respectively communicated with a lepidolite concentrate dewatering device (9) and a feldspar concentrate dewatering device (10).

2. The low-grade refractory lepidolite beneficiation system according to claim 1, characterized in that, The crushing device (1) comprises a jaw crusher (11'), a medium crushing cone crusher (12) and a fine crushing cone crusher (13), the discharge port of the jaw crusher (11') is connected with the feeding port of the medium crushing cone crusher (12) through a belt, the discharge port of the medium crushing cone crusher (12) is connected with the feeding port of the fine crushing cone crusher (13), the crushing and grading device (2) is a circular vibrating screen, the medium crushing cone crusher (12) and the fine crushing cone crusher (13) are connected with the circular vibrating screen, the unqualified material on the upper layer screen of the circular vibrating screen is returned to the medium crushing cone crusher (12) for further crushing through a belt, the unqualified material on the lower layer screen of the circular vibrating screen is fed into the fine crushing cone crusher (13) for further crushing, and the qualified material under the screen is transported to the fine ore bin through a belt.

3. The low-grade refractory lepidolite beneficiation system according to claim 2, wherein, The crushing and grading device (2) and the grinding device (4) are further provided with a pre-milling screening device (3), the fine ore bin is connected with the pre-milling screening device (3), the pre-milling screening device (3) is a linear vibrating screen, the grinding device (4) is a ball mill, the linear vibrating screen is connected with the ball mill, the ball mill is connected with the grinding and grading device (5) through a pipeline, the grinding and grading device (5) comprises a spiral classifier (51) and a high-frequency fine screen (52), the linear vibrating screen is connected with the spiral classifier (51), the material on the screen of the linear vibrating screen is fed into the ball mill, and the material under the screen is fed into the spiral classifier (51) together with the discharge of the ball mill, the sand returned from the spiral classifier (51) is returned to the ball mill for further grinding, the overflow is fed into the high-frequency fine screen (52) for inspection and screening, the material on the screen of the high-frequency fine screen (52) is returned to the ball mill, and the material under the screen is fed into a wet-type permanent-magnetic drum-type low-intensity magnetic separator and then into the reselection device (6) after removing iron.

4. The low-grade refractory lepidolite beneficiation system according to claim 3, wherein, The material after iron removal enters the gravity separation equipment (6) to recover tantalum niobium tin through the tantalum niobium tin concentrate outlet, the gravity separation equipment (6) includes a roughing cloth chute (61), a scavenging cloth chute (62), a concentrating table (63) and a scavenging table (64), the material under the high-frequency fine screen (52) is fed into the roughing cloth chute (61) after iron removal, the concentrate outlet of the roughing cloth chute (61) is connected with the feed inlet of the concentrating table (63), and the tailing outlet is connected with the feed inlet of the scavenging cloth chute (62), the concentrate outlet of the scavenging cloth chute (62) is connected with the feed inlet of the concentrating table (63), and the tailing outlet is connected with the feed inlet of the desliming equipment (7), the concentrate outlet of the concentrating table (63) outputs tantalum niobium tin concentrate, the tailing outlet is connected with the feed inlet of the roughing cloth chute (61), and the middling outlet is connected with the feed inlet of the scavenging table (64), the concentrate outlet of the scavenging table (64) outputs tantalum niobium tin concentrate, the middling outlet is connected with the feed inlet of the roughing cloth chute (61), and the tantalum niobium tin not selected in the middling is further recovered.

5. The low-grade refractory lepidolite beneficiation system according to claim 4, wherein, The desliming equipment (7) includes a first desliming hydrocyclone (71) and a second desliming hydrocyclone (72), the feed inlet of the first desliming hydrocyclone (71) is connected with the tailing outlet of the scavenging cloth chute (62), the underflow outlet is connected with the feed inlet of the flotation equipment (8), and the overflow outlet is connected with the feed inlet of the second desliming hydrocyclone (72), the underflow outlet of the second desliming hydrocyclone (72) is connected with the feed inlet of the flotation equipment (8), and the overflow outlet enters the thickener tank for thickening and then enters the tailing dewatering equipment (11) for multi-stage dewatering, the tailing dewatering equipment (11) is a plate-and-frame filter press, and the overflow of the first desliming hydrocyclone (71) enters the second desliming hydrocyclone (72); the material after desliming enters the flotation equipment (8), and the lithium mica concentrate is obtained through flotation.

6. The low-grade refractory lepidolite beneficiation system according to claim 5, wherein, The flotation equipment (8) includes a roughing flotation machine (81), a concentrating one flotation machine (82), a concentrating two flotation machine (83), a concentrating three flotation machine (84), a scavenging one flotation machine (85) and a scavenging two flotation machine (86), the feed inlet of the roughing flotation machine (81) is connected with the underflow outlets of the first desliming hydrocyclone (71) and the second desliming hydrocyclone (72), and is used for preliminary flotation enrichment of qualified material; the feed inlet of the concentrating one flotation machine (82) is connected with the concentrate outlet of the roughing flotation machine (81), the tailing outlet is connected with the feed inlet of the roughing flotation machine (81), and the lithium mica in the ore slurry is further recovered by returning to the roughing; the feed inlet of the concentrating two flotation machine (83) is connected with the concentrate outlet of the concentrating one flotation machine (82), the tailing outlet is connected with the feed inlet of the concentrating one flotation machine (82), the tailing of the concentrating two is returned to the concentrating one flotation machine (82) for further separation, the concentrate outlet of the concentrating two flotation machine (83) is connected with the feed inlet of the concentrating three flotation machine (84), the tailing outlet of the concentrating three flotation machine (84) is connected with the feed inlet of the concentrating two flotation machine (83), and the concentrate outlet is connected with the feed inlet of the lithium mica concentrate dewatering equipment (9).

7. The low-grade refractory lepidolite beneficiation system according to claim 6, wherein, Tailings discharge of rougher flotation machine (81) is connected with feed inlet of scavenger 1 flotation machine (85), and the concentrate returned to rougher flotation machine (81) is selected by scavenger 1, and feed inlet of scavenger 2 flotation machine (86) is connected with tailings discharge of scavenger 1 flotation machine (85), and tailings discharge is connected with feldspar concentrate dewatering device (10).

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