Mica-containing spodumene ore separation system and separation process

Abstract

The present application relates to the technical field of mica-containing spodumene ore dressing, in particular to a mica-containing spodumene ore separation system and separation process, characterized in that the system comprises a coarse-grained heavy medium separation mechanism, a coarse-grained shaking table separation mechanism, a desliming separation mechanism, a mica flotation mechanism and a fine-grained lithium separation mechanism; the coarse-grained heavy medium separation mechanism is connected with the coarse-grained shaking table separation mechanism and the desliming separation mechanism respectively; the coarse-grained shaking table separation mechanism and the desliming separation mechanism are connected with the mica flotation mechanism and the fine-grained lithium separation mechanism in sequence respectively; and the separation is carried out through the processes of coarse-grained heavy medium separation, coarse-grained shaking table separation, preparation before flotation, mica flotation and fine-grained lithium flotation, which has the advantages of strong adaptability, good separation index, low production cost, good concentrate quality, high economic benefit, fast capital reflux and the like.

Description

Technical Field

[0001] This invention relates to the field of mica-bearing spodumene ore beneficiation technology, specifically to a mica-bearing spodumene ore beneficiation system and process that is highly adaptable, has good beneficiation indicators, low production costs, good concentrate quality, high economic benefits, and fast capital return. Background Technology

[0002] In recent years, with the rapid development of the lithium-ion battery industry, the demand for lithium has been increasing. Spodumene, as the most important mineral source of lithium, has attracted widespread attention for its beneficiation. Single flotation is the most commonly used beneficiation method for spodumene, but it has the following four drawbacks: ① The ore usually has a high mud content, which pollutes the beneficiation environment and worsens the floatability of the ore; ② Inevitable ions in the pulp (such as Ca2+)... 2+ Mg 2+ Fe 3+ ① It simultaneously activates spodumene and gangue minerals, making separation difficult and affecting concentrate grade and recovery rate; ② Some ores contain mica, which floats very easily. If not removed beforehand, it affects concentrate quality; ③ With the continuous depletion of mineral resources, the mining and processing of low-grade ores has become inevitable. The full-scale flotation process has low flotation efficiency, high grinding costs, flotation reagent costs, and tailings treatment costs, making it difficult to maximize the company's economic benefits. In summary, the full flotation process for spodumene mining has problems such as poor separation index, high production costs, low economic benefits, and slow capital return. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mica-bearing spodumene ore beneficiation system and process that is highly adaptable, has good beneficiation indicators, low production costs, good concentrate quality, high economic benefits, and fast capital return.

[0004] The technical solution adopted by this invention to solve its technical problem is: A beneficiation system for mica-containing spodumene ore is characterized in that the system includes a coarse-grained heavy medium separation mechanism, a coarse-grained shaking table separation mechanism, a desliming separation mechanism, a mica flotation mechanism, and a fine-grained lithium separation mechanism. The coarse-grained heavy medium separation mechanism is connected to the coarse-grained shaking table separation mechanism and the desliming separation mechanism, respectively. The coarse-grained shaking table separation mechanism and the desliming separation mechanism are connected to the mica flotation mechanism and the fine-grained lithium separation mechanism, respectively.

[0005] The coarse-grained heavy medium separation mechanism of the present invention includes a crusher, a classifying screen, and a heavy medium hydrocyclone. The outlet of the crusher is connected to the classifying screen, the oversize outlet of the classifying screen is connected to the inlet of the heavy medium hydrocyclone, the underflow outlet of the heavy medium hydrocyclone is connected to the coarse-grained shaking table separation mechanism, the overflow outlet of the heavy medium hydrocyclone is tailings, and the undersize outlet of the classifying screen is connected to the desliming separation mechanism.

[0006] The coarse-grained shaking table separation mechanism of the present invention includes a shaking table, the inlet of which is connected to the underflow outlet of the heavy medium cyclone, the heavy product outlet of the shaking table is concentrate, and the light product outlet of the shaking table is connected to the mica flotation mechanism.

[0007] The desliming and sorting mechanism of the present invention includes a desliming hydrocyclone and a dewatering screen. The inlet of the desliming hydrocyclone is connected to the underflow outlet of the grading screen, the underflow product outlet of the desliming hydrocyclone is connected to the inlet of the dewatering screen, the overflow product of the desliming hydrocyclone is fine mud, the underflow outlet of the dewatering screen is connected to the inlet of the desliming hydrocyclone, and the overflow outlet of the dewatering screen is connected to the mica flotation mechanism.

[0008] The mica flotation mechanism of the present invention includes a ball mill, a first stirring tank, a mica roughing flotation machine, and a mica scavenging flotation machine. The inlet of the ball mill is connected to the light product outlet of the shaking table and the oversize outlet of the dewatering screen, respectively. The outlet of the ball mill is connected to the inlet of the first stirring tank. The outlet of the first stirring tank is connected to the inlet of the mica roughing flotation machine. The in-tank product outlet of the mica roughing flotation machine is connected to the feed inlet of the mica scavenging flotation machine. The product from the froth product outlet of the mica roughing flotation machine and the product from the froth product outlet of the mica scavenging flotation machine are combined to form mica concentrate. The in-tank product outlet of the mica scavenging flotation machine is connected to a fine-particle lithium separation mechanism.

[0009] The fine-particle lithium separation mechanism of this invention includes a second stirring tank, a lithium roughing flotation machine, a lithium cleaning first flotation machine, a lithium cleaning second flotation machine, a lithium cleaning third flotation machine, a lithium scavenging first flotation machine, a lithium scavenging second flotation machine, and a lithium scavenging third flotation machine. The product outlet of the mica scavenging flotation machine is connected to the inlet of the second stirring tank, and the outlet of the second stirring tank is connected to the inlet of the lithium roughing flotation machine. The froth product outlet of the lithium roughing flotation machine is connected to the inlet of the lithium cleaning first flotation machine. The product outlet of the lithium cleaning first flotation machine is connected to the inlet of the lithium roughing flotation machine. The froth product outlet of the lithium cleaning first flotation machine is connected to the inlet of the lithium cleaning second flotation machine. The product outlet of the lithium cleaning second flotation machine is connected to the inlet of the lithium cleaning first flotation machine. The froth product outlet of the lithium cleaning second flotation machine is connected to the lithium cleaning third flotation machine. The feed inlet of the third flotation machine is connected to the feed inlet of the lithium refining third flotation machine. The product outlet of the lithium refining third flotation machine is connected to the feed inlet of the lithium refining second flotation machine. The froth product of the lithium refining third flotation machine is fine-grained lithium concentrate. The product outlet of the lithium roughing flotation machine is connected to the feed inlet of the lithium scavenging first flotation machine. The froth product outlet of the lithium scavenging first flotation machine is connected to the feed inlet of the lithium roughing flotation machine. The product outlet of the lithium scavenging first flotation machine is connected to the feed inlet of the lithium scavenging second flotation machine. The froth product outlet of the lithium scavenging second flotation machine is connected to the feed inlet of the lithium scavenging first flotation machine. The product outlet of the lithium scavenging second flotation machine is connected to the feed inlet of the lithium scavenging third flotation machine. The froth product outlet of the lithium scavenging third flotation machine is connected to the feed inlet of the lithium scavenging second flotation machine. The product at the product outlet of the lithium scavenging third flotation machine is fine-grained tailings.

[0010] A beneficiation process for mica-bearing spodumene ore, characterized by the following steps: (1) Coarse-grained heavy media separation: After the raw spodumene ore is crushed, light minerals with a specific gravity lower than that of spodumene are first removed from the ore to obtain coarse-grained tailings and spodumene rough concentrate. (2) Coarse-grained shaking table separation: The spodumene rough concentrate is processed by shaking table to obtain coarse-grained lithium concentrate and coarse-grained lithium middlings; (3) Preparatory work before flotation: The slurry under the grading screen is processed by the desliming hydrocyclone and the dewatering screen in sequence to obtain fine mud and the product over the dewatering screen. Then the product over the dewatering screen and the coarse lithium middlings are fed into the ball mill. (4) Mica flotation: The ground slurry is subjected to mica flotation to separate mica concentrate and mica tailings; (5) Fine-grained lithium flotation: The mica tailings generated in step (4) are subjected to fine-grained lithium flotation to separate fine-grained lithium concentrate and fine-grained tailings.

[0011] The mica-bearing spodumene ore mentioned in step (1) of this invention is a raw ore with a Li2O grade greater than 0.5%, a mica content greater than 3.0%, and a total content of light gangue minerals such as quartz and feldspar greater than 45%. In step (1), a heavy medium hydrocyclone is used to remove the light gangue minerals from the ore. The feed particle size range of the heavy medium hydrocyclone is 0.5~15mm, the inlet pressure is 0.10~0.25MPa, and the bulk density is 1.9~2.5g / cm³. 3 In step (2), the slurry fed to the shaking table has a mass concentration of 20% to 30%, a stroke of 14 to 30 mm, and a stroke rate of 240 to 300 min. In step (3), the slurry of the desliming hydrocyclone has a mass concentration of 8 to 20% and a feed pressure of 0.08 to 0.20 MPa. In step (4), the slurry fineness is -200 mesh, accounting for 60 to 90%, and a "one coarse and one scavenging" process is adopted, with collectors and frothers added in sequence. In step (5), a "one coarse, three fine, and three scavenging" process is adopted, with adjusters, collectors, and frothers added in sequence.

[0012] Due to the above-mentioned structure, this invention has the advantages of strong adaptability, good sorting index, low production cost, good concentrate quality, high economic benefits, and fast capital return. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings: As shown in the attached figure, a mica-containing spodumene ore beneficiation system is characterized in that the system includes a coarse-grained heavy medium separation mechanism, a coarse-grained shaking table separation mechanism, a desliming separation mechanism, a mica flotation mechanism, and a fine-grained lithium separation mechanism. The coarse-grained heavy medium separation mechanism is connected to the coarse-grained shaking table separation mechanism and the desliming separation mechanism, respectively. The coarse-grained shaking table separation mechanism and the desliming separation mechanism are connected to the mica flotation mechanism and the fine-grained lithium separation mechanism, respectively.

[0015] Furthermore, the coarse-grained heavy medium separation mechanism includes a crusher 1, a classifying screen 2, and a heavy medium hydrocyclone 3. The outlet of the crusher 1 is connected to the classifying screen 2, the oversize outlet of the classifying screen 2 is connected to the inlet of the heavy medium hydrocyclone 3, the underflow outlet of the heavy medium hydrocyclone 3 is connected to the coarse-grained shaking table separation mechanism, the overflow outlet of the heavy medium hydrocyclone 3 is tailings, and the undersize outlet of the classifying screen 2 is connected to the desliming separation mechanism.

[0016] Furthermore, the coarse-grained shaking table separation mechanism includes a shaking table 4, the inlet of which is connected to the underflow outlet of the heavy medium cyclone 3, the heavy product outlet of the shaking table 4 is concentrate, and the light product outlet of the shaking table 4 is connected to the mica flotation mechanism.

[0017] Furthermore, the desliming and sorting mechanism includes a desliming hydrocyclone 5 and a dewatering screen 6. The inlet of the desliming hydrocyclone 5 is connected to the underflow outlet of the grading screen 2, the underflow product outlet of the desliming hydrocyclone 5 is connected to the inlet of the dewatering screen 6, the overflow product of the desliming hydrocyclone 5 is fine mud, the underflow outlet of the dewatering screen 6 is connected to the inlet of the desliming hydrocyclone 5, and the overflow outlet of the dewatering screen 6 is connected to the mica flotation mechanism.

[0018] Furthermore, the mica flotation mechanism includes a ball mill 7, a first stirring tank 8, a mica roughing flotation machine 9, and a mica scavenging flotation machine 10. The inlet of the ball mill 7 is connected to the light product outlet of the shaking table 4 and the oversize outlet of the dewatering screen 6, respectively. The outlet of the ball mill 7 is connected to the inlet of the first stirring tank 8. The outlet of the first stirring tank 8 is connected to the inlet of the mica roughing flotation machine 9. The in-tank product outlet of the mica roughing flotation machine 9 is connected to the feed inlet of the mica scavenging flotation machine 10. The product from the froth product outlet of the mica roughing flotation machine 9 and the product from the froth product outlet of the mica scavenging flotation machine 10 are combined to form mica concentrate. The in-tank product outlet of the mica scavenging flotation machine 10 is connected to the fine lithium separation mechanism.

[0019] Furthermore, the fine-particle lithium separation mechanism includes a second stirring tank 11, a lithium roughing flotation machine 12, a lithium cleaning first flotation machine 13, a lithium cleaning second flotation machine 14, a lithium cleaning third flotation machine 15, a lithium scavenging first flotation machine 16, a lithium scavenging second flotation machine 17, and a lithium scavenging third flotation machine 18. The product outlet of the mica scavenging flotation machine 10 is connected to the feed inlet of the second stirring tank 11, and the outlet of the second stirring tank 11 is connected to the feed inlet of the lithium roughing flotation machine 12. The froth product outlet of flotation machine 12 is connected to the feed inlet of the first lithium refining flotation machine 13. The in-tank product outlet of the first lithium refining flotation machine 13 is connected to the feed inlet of the lithium roughing flotation machine 12. The froth product outlet of the first lithium refining flotation machine 13 is connected to the feed inlet of the second lithium refining flotation machine 14. The in-tank product outlet of the second lithium refining flotation machine 14 is connected to the feed inlet of the first lithium refining flotation machine 13. The froth product outlet of the second lithium refining flotation machine 14... The feed inlet of the third lithium refining flotation machine 15 is connected to the feed inlet of the second lithium refining flotation machine 14. The froth product of the third lithium refining flotation machine 15 is fine-grained lithium concentrate. The product outlet of the lithium roughing flotation machine 12 is connected to the feed inlet of the first lithium scavenging flotation machine 16. The froth product outlet of the first lithium scavenging flotation machine 16 is connected to the feed inlet of the lithium roughing flotation machine 12. The product outlet of flotation cell 6 is connected to the feed inlet of the second lithium scavenging flotation machine 17. The froth product outlet of the second lithium scavenging flotation machine 17 is connected to the feed inlet of the first lithium scavenging flotation machine 16. The product outlet of the second lithium scavenging flotation machine 17 is connected to the feed inlet of the third lithium scavenging flotation machine 18. The froth product outlet of the third lithium scavenging flotation machine 18 is connected to the feed inlet of the second lithium scavenging flotation machine 17. The product from the product outlet of the third lithium scavenging flotation machine 18 is fine tailings.

[0020] Furthermore, the steps of the sorting process are as follows: (1) Coarse-grained heavy media separation: After the raw spodumene ore is crushed, light minerals with a specific gravity lower than that of spodumene are first removed from the ore to obtain coarse-grained tailings and spodumene rough concentrate. (2) Coarse-grained shaking table 4 separation: The spodumene rough concentrate is processed by shaking table 4 to obtain coarse-grained lithium concentrate and coarse-grained lithium middlings; (3) Preparation before flotation: The slurry under the grading screen 2 is processed by the desliming hydrocyclone 5 and the dewatering screen 6 in sequence to obtain fine mud and the product over the dewatering screen 6. Then the product over the dewatering screen 6 and the coarse lithium middlings are fed into the ball mill 7. (4) Mica flotation: The ground slurry is subjected to mica flotation to separate mica concentrate and mica tailings; (5) Fine-grained lithium flotation: The mica tailings generated in step (4) are subjected to fine-grained lithium flotation to separate fine-grained lithium concentrate and fine-grained tailings.

[0021] Furthermore, the mica-bearing spodumene ore mentioned in step (1) is a raw ore with a Li2O grade greater than 0.5%, a mica content greater than 3.0%, and a total content of light gangue minerals such as quartz and feldspar greater than 45%. In step (1), a heavy medium hydrocyclone is used to remove the light gangue minerals from the ore. The feed particle size range of the heavy medium hydrocyclone 3 is 0.5~15mm, the inlet pressure is 0.10~0.25MPa, and the bulk density is 1.9~2.5g / cm³. 3 In step (2), the slurry fed to the shaking table 4 has a mass concentration of 20%~30%, a stroke of 14-30mm, and a stroke rate of 240-300min. In step (3), the slurry of the desliming hydrocyclone 5 has a mass concentration of 8~20% and a feed pressure of 0.08-0.20MPa. In step (4), the slurry fineness is -200 mesh, accounting for 60~90%, and a "one coarse and one scavenging" process is adopted, with collectors and frothers added in sequence. In step (5), a "one coarse, three fine, and three scavenging" process is adopted, with adjusters, collectors, and frothers added in sequence.

[0022] The beneficial effects of this invention are as follows: 1) This invention requires desliming before selecting mica. Because the slime is too fine, it easily adheres to air bubbles, which reduces the selectivity of the reagents and increases the lithium loss rate in the mica concentrate. Moreover, the slime has a large specific surface area, which will adsorb a large amount of flotation reagents in the pulp, reducing the reagent concentration in the pulp, increasing reagent consumption, and increasing operating costs. At the same time, because the slime is very fine and has a large surface area, its surface activity is increased, making it easy to react with various reagents, difficult to separate, and highly hydrated, which makes the foam too stable, reduces the quality of the concentrate, and affects the efficiency of subsequent concentration.

[0023] 2) This invention prioritizes the removal of coarse tailings through heavy media separation. This greatly reduces the difficulty of separating gangue minerals from lithium ore in the subsequent flotation process. The original simple flotation method inevitably causes ions to form stable compounds on the surface of gangue minerals, which strengthens the chemical and physical adsorption between the reagents and the surface of gangue minerals. This results in gangue minerals entering the lithium concentrate and affecting the quality of the concentrate.

[0024] 3) Due to the above-mentioned structure, the present invention has the advantages of strong adaptability, good sorting index, low production cost, good concentrate quality, high economic benefits and fast capital return.

[0025] Example 1 A certain mica-bearing spodumene ore has a Li2O grade of 0.80%, a mica content of about 9.0%, and gangue minerals mainly consisting of quartz, mica, and feldspar.

[0026] The ore was processed using a beneficiation process for mica-bearing spodumene ore. The specific steps are as follows: The raw ore is fed into crusher 1 and crushed to -10mm. After being screened by grading screen 2, two particle sizes are obtained: -0.5mm and +0.5mm to -10mm. The +0.5mm to -10mm particle size ore is then fed into heavy medium hydrocyclone 3 at an inlet pressure of 0.15MPa and a bulk density of 2.30g / cm³. 3 Under the conditions, the heavy product and the light product are separated into coarse lithium concentrate and coarse tailings, respectively. The concentration of heavy product slurry is adjusted to 25% and fed into shaking table 4. The concentrate of shaking table 4 is coarse lithium concentrate, and the tailings of shaking table 4 is coarse lithium middlings. The slurry with a thickness of -0.5mm from the grading screen 2 is fed into the desliming hydrocyclone 5. Desliming is carried out under a feed pressure of 0.10MPa. After removing some of the fine mud, the underflow goes to the dewatering screen 6. The slurry under the dewatering screen 6 is returned to the desliming hydrocyclone 5 to form a closed circuit. The slurry over the dewatering screen 6 is fed into the ball mill along with the coarse lithium middlings separated by the shaking table 4. The ore is ground to -0.074mm (70%), and the slurry concentration is adjusted to 40%. It is then fed into the first mixing tank 8, and collector and frother are added in sequence. The slurry is then fed into the mica roughing flotation machine 9 through pipeline. The product in the tank of the mica roughing flotation machine 9 is fed into the mica scavenging flotation machine 10. The product in the tank of the mica scavenging flotation machine 10 is the mica tailings. The frothy product from the mica roughing flotation machine 9 and the mica scavenging flotation machine 10 is the mica concentrate.

[0027] Mica tailings are fed into the second mixing tank 11 via pipeline. After the addition of modifier, collector, and frother, the tailings flow into the lithium roughing flotation machine 12 via pipeline. The product from the lithium roughing flotation machine 12 is fed into the first lithium scavenging flotation machine 16. The froth product from the lithium roughing flotation machine 12 is fed into the first lithium cleaning flotation machine 13. The froth product from the first lithium scavenging flotation machine 16 is fed into the lithium roughing flotation. The product from the first lithium scavenging flotation machine 16 is fed into the second lithium scavenging flotation machine 17. The froth product from the second lithium scavenging flotation machine 17 is fed into the first lithium scavenging flotation machine 16. The product from the second lithium scavenging flotation machine 17 is fed into the third lithium scavenging flotation machine 18. The froth product from the third flotation machine 18 is fed into the second lithium scavenging flotation machine 17, the froth product from the first lithium refining flotation machine 13 is fed into the second lithium refining flotation machine 14, the in-tank product from the first lithium refining flotation machine 13 is fed into the lithium roughing flotation machine 12, the froth product from the second lithium refining flotation machine 14 is fed into the third lithium refining flotation machine 15, the in-tank product from the second lithium refining flotation machine 14 is fed into the first lithium refining flotation machine 13, the in-tank product from the third lithium refining flotation machine 15 is fed into the second lithium refining flotation machine 14, the froth product from the third lithium refining flotation machine 15 is fine-grained lithium concentrate, and the in-tank product from the third lithium scavenging flotation machine 18 is fine-grained tailings.

[0028] The test results of Example 1 are shown in Table 1.

[0029] Table 1. Test results of Example 1 In summary, the separation process described in this embodiment allows for the early removal of large amounts of waste rock in coarse-grained heavy media separation, reducing grinding and flotation costs, and extending the service life of tailings ponds. The removed ore can also be sold as building materials. The shaking table separation process removes coarse mica, ensuring the quality of the rough concentrate. This invention deslims before separating mica, mitigating the impact of slime on flotation and ensuring better individual liberation of spodumene minerals. The mica flotation process employs a "one-coarse-one-scavenger" flow, eliminating the impact of mica minerals on the quality of the fine concentrate. The fine lithium flotation process employs a "one-coarse-three-clean-three-scavenger" flow, fully guaranteeing the grade and recovery rate of the fine lithium concentrate. Ultimately, a coarse concentrate with a Li2O grade of 5.65% and a comprehensive Li2O recovery rate of 59.70% and a fine concentrate with a Li2O grade of 5.02% and a comprehensive Li2O recovery rate of 12.48% are obtained, achieving efficient recovery of spodumene ore. The spodumene-bearing mica ore has good sorting performance and is suitable for widespread application.

Claims

1. A beneficiation system for mica-bearing spodumene ore, characterized in that... The system includes a coarse-grained heavy medium separation mechanism, a coarse-grained shaking table separation mechanism, a desliming separation mechanism, a mica flotation mechanism, and a fine-grained lithium separation mechanism. The coarse-grained heavy medium separation mechanism is connected to the coarse-grained shaking table separation mechanism and the desliming separation mechanism, which in turn are connected to the mica flotation mechanism and the fine-grained lithium separation mechanism, respectively. The coarse-grained heavy medium separation mechanism includes a crusher, a classifying screen, and a heavy medium hydrocyclone. The outlet of the crusher is connected to the classifying screen, the oversize outlet of the classifying screen is connected to the inlet of the heavy medium hydrocyclone, the underflow outlet of the heavy medium hydrocyclone is connected to the coarse-grained shaking table separation mechanism, the overflow outlet of the heavy medium hydrocyclone is tailings, and the undersize outlet of the classifying screen is connected to the desliming separation mechanism. The coarse-grained shaking table separation mechanism includes a shaking table, the inlet of which is connected to the underflow outlet of the heavy medium hydrocyclone, the heavy product outlet of the shaking table is concentrate, and the light product outlet of the shaking table is connected to the mica flotation mechanism. The desliming separation mechanism includes a desliming... The system includes a mud hydrocyclone and a dewatering screen. The inlet of the mud hydrocyclone is connected to the underflow outlet of the grading screen, the underflow product outlet of the mud hydrocyclone is connected to the inlet of the dewatering screen, the overflow product of the mud hydrocyclone is fine mud, the underflow outlet of the dewatering screen is connected to the inlet of the mud hydrocyclone, and the overflow outlet of the dewatering screen is connected to the mica flotation mechanism. The mica flotation mechanism includes a ball mill, a first stirring tank, a mica roughing flotation machine, and a mica scavenging flotation machine. The inlet of the ball mill is connected to a shaking table. The outlet of the light product is connected to the outlet of the dewatering screen, the outlet of the ball mill is connected to the inlet of the first mixing tank, the outlet of the first mixing tank is connected to the inlet of the mica roughing flotation machine, the in-tank product outlet of the mica roughing flotation machine is connected to the feed inlet of the mica scavenging flotation machine, the product from the foam product outlet of the mica roughing flotation machine and the product from the foam product outlet of the mica scavenging flotation machine are combined to form mica concentrate, and the in-tank product outlet of the mica scavenging flotation machine is connected to the fine lithium separation mechanism.

2. The mica-bearing spodumene ore sorting system according to claim 1, characterized in that... The fine-particle lithium separation mechanism includes a second stirring tank, a lithium roughing flotation machine, a lithium cleaning first flotation machine, a lithium cleaning second flotation machine, a lithium cleaning third flotation machine, a lithium scavenging first flotation machine, a lithium scavenging second flotation machine, and a lithium scavenging third flotation machine. The product outlet of the mica scavenging flotation machine is connected to the inlet of the second stirring tank. The outlet of the second stirring tank is connected to the inlet of the lithium roughing flotation machine. The froth product outlet of the lithium roughing flotation machine is connected to the inlet of the lithium cleaning first flotation machine. The product outlet of the lithium cleaning first flotation machine is connected to the inlet of the lithium roughing flotation machine. The froth product outlet of the lithium cleaning first flotation machine is connected to the inlet of the lithium cleaning second flotation machine. The product outlet of the lithium cleaning second flotation machine is connected to the inlet of the lithium cleaning first flotation machine. The froth product outlet of the lithium cleaning second flotation machine is connected to the inlet of the lithium cleaning third flotation machine. The feed inlets of the three flotation machines are connected. The product outlet of the third lithium refining flotation machine is connected to the feed inlet of the second lithium refining flotation machine. The froth product of the third lithium refining flotation machine is fine-grained lithium concentrate. The product outlet of the first lithium scavenging flotation machine is connected to the feed inlet of the first lithium scavenging flotation machine. The froth product outlet of the first lithium scavenging flotation machine is connected to the feed inlet of the first lithium roughing flotation machine. The product outlet of the first lithium scavenging flotation machine is connected to the feed inlet of the second lithium scavenging flotation machine. The froth product outlet of the second lithium scavenging flotation machine is connected to the feed inlet of the first lithium scavenging flotation machine. The product outlet of the second lithium scavenging flotation machine is connected to the feed inlet of the third lithium scavenging flotation machine. The product at the product outlet of the third lithium scavenging flotation machine is fine-grained tailings.

3. The separation process of the mica-bearing spodumene ore separation system according to claim 1, characterized in that... The steps of the sorting process are as follows: (1) Coarse-grained heavy media separation: After the raw spodumene ore is crushed, light minerals with a specific gravity lower than that of spodumene are first removed from the ore to obtain coarse-grained tailings and spodumene rough concentrate. (2) Coarse-grained shaking table separation: The spodumene rough concentrate is processed by shaking table to obtain coarse-grained lithium concentrate and coarse-grained lithium middlings; (3) Preparatory work before flotation: The slurry under the grading screen is processed by the desliming hydrocyclone and the dewatering screen in sequence to obtain fine mud and the product over the dewatering screen. Then the product over the dewatering screen and the coarse lithium middlings are fed into the ball mill. (4) Mica flotation: The ground slurry is subjected to mica flotation to separate mica concentrate and mica tailings; (5) Fine-grained lithium flotation: The mica tailings generated in step (4) are subjected to fine-grained lithium flotation to separate fine-grained lithium concentrate and fine-grained tailings.

4. The beneficiation process for mica-bearing spodumene ore according to claim 3, characterized in that... The mica-bearing spodumene ore mentioned in step (1) is a raw ore with a Li2O grade greater than 0.5%, a mica content greater than 3.0%, and a total content of quartz, feldspar, and light-density gangue minerals greater than 45%. In step (1), a heavy medium hydrocyclone is used to remove the light-density gangue minerals from the ore. The feed particle size range of the heavy medium hydrocyclone is 0.5~15mm, the inlet pressure is 0.10~0.25MPa, and the bulk density is 1.9~2.5g / cm³. 3 In step (2), the slurry fed to the shaking table has a mass concentration of 20% to 30%, a stroke of 14 to 30 mm, and a stroke count of 240 to 300 min. In step (3), the slurry of the desliming hydrocyclone has a mass concentration of 8 to 20% and a feed pressure of 0.08 to 0.20 MPa. In step (4), the slurry fineness is -200 mesh, accounting for 60 to 90%, and a "one coarse and one scavenging" process is adopted, with collectors and frothers added in sequence. In step (5), a "one coarse, three fine, and three scavenging" process is adopted, with adjusters, collectors, and frothers added in sequence.

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