A lepidolite selective flotation collector and its application method

Abstract

The present invention provides a lepidolite selective flotation collector and an application method thereof, belonging to the technical field of mineral processing reagents. The collector is a mixture of 3-[N, N-dimethyl, N-octadecyl] ammonium, 2-hydroxypropane sulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleic acid soap, and after emulsification and dispersion, a uniform viscous suspension is obtained. During application, the ore containing lepidolite is crushed and ground, and sodium hexametaphosphate and lepidolite collector are added to carry out lepidolite flotation recovery operation; the raw ore is subjected to a flotation process of a roughing, a secondary scavenging and a secondary concentrating to obtain lepidolite concentrate. The collector of the present invention has significant advantages such as strong selectivity, easy availability and storage, few types of reagents, low requirements for water quality and ore mud, strong foaming ability, good foam fluidity, stable flotation index, etc., has a good targeted flotation effect on lepidolite, and effectively improves the mineral processing index of lepidolite.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing reagents, and in particular to a lepidolite selective flotation collector and an application method thereof. Background Art

[0002] Lithium, the lightest metal in the periodic table, is widely used in new energy, nuclear industry, aerospace, new materials, and pharmaceuticals. With the rapid development of my country's new energy industry, demand for lithium is rapidly increasing. my country possesses abundant lithium resources, primarily found in high-salinity brines, spodumene, and lepidolite. However, geographical location and cost-effectiveness make the development of lithium resources in high-salinity brines more challenging. Therefore, the mining and utilization of lithium minerals is a key approach to addressing my country's lithium supply challenges. However, years of continuous exploitation of spodumene have led to the gradual depletion of high-quality spodumene, making it difficult to meet market demand. Therefore, lepidolite has become a key approach to alleviating the current lithium shortage. In natural deposits, lepidolite is complexly distributed with gangue minerals such as feldspar and quartz, making it difficult to separate them. Furthermore, weathering and erosion severely muddy the ore, hindering efficient lithium recovery.

[0003] Flotation is the most widely used method for recovering lepidolite in industry. However, the flotation process is affected by factors such as ore slime content, flotation reagents, and water hardness. Long-term production practice has shown that the high mud content in the ore adsorbs and covers the lepidolite surface, further affecting the adsorption of collectors and reducing the recovery rate of the lepidolite mineral. Furthermore, since the ore slime and lepidolite surfaces are both negatively charged, they compete for the cationic collector, resulting in high collector usage and hindering efficient lepidolite recovery.

[0004] Currently, existing flotation processes typically require desludging before lepidolite flotation operations to reduce the deterioration of subsequent lepidolite flotation by fine mud. However, since fine mud is rich in fine-grained lepidolite, lithium resource losses are relatively large. During the lepidolite flotation operation, amine collectors are often used to collect lepidolite. Since such collectors often require acidic conditions to function effectively, they are not effective in collecting lepidolite. However, this increases equipment corrosion and the problem of treating large amounts of acidic wastewater, increasing production costs and hindering efficient and environmentally friendly recovery of lepidolite. Therefore, these problems have become a difficulty in the efficient and environmentally friendly recovery of lepidolite.

[0005] Therefore, the development of a new type of lepidolite collector with strong selectivity, good resistance to mineral slime, no need for acid addition, and strong collecting performance is of great significance to improving the comprehensive utilization level of lithium mineral resources in my country. Summary of the Invention

[0006] The present invention addresses the difficulties of existing lepidolite flotation processes, such as significant influence from ore slime, poor targeted capture efficiency, the need for acid preparation, and difficulty in wastewater treatment. A selective lepidolite flotation collector and its application method are provided. This collector eliminates conventional desludging during lepidolite flotation, shortens the process flow, and effectively eliminates the use of acid, while maintaining lithium recovery. It offers advantages such as high capture efficiency and minimal environmental pollution, and can be widely applied in flotation processes.

[0007] In order to solve the above-mentioned purpose of the invention, the technical solution provided by the present invention is as follows:

[0008] A lepidolite selective flotation collector is prepared by mixing 3-[N,N-dimethyl,N-octadecyl]ammonium group, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleate soap;

[0009] The mass ratio of 3-[N, N-dimethyl, N-octadecyl]ammonium group, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleic acid soap is 4.0-5.0:2.0-2.5:1.0-1.5:2.0-2.5.

[0010] The preparation method of the collector is as follows:

[0011] 3-[N, N-dimethyl, N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleic acid soap are mixed according to mass ratio, and then emulsified and dispersed to obtain a uniform viscous suspension, which is a lepidolite flotation collector.

[0012] Preferably, the mass ratio of 3-[N,N-dimethyl, N-octadecyl]ammonium group, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleate soap is 5:2:1:2.

[0013] Preferably, the etheramine is a C8-C10 etheramine.

[0014] The emulsification and dispersion are carried out in a high shear emulsifier, the rotation speed of the high shear emulsifier is not less than 7000 rpm, and the emulsification and dispersion time is 15 to 20 minutes.

[0015] The application method of the collector comprises the following steps:

[0016] S1. Crushing and grinding ore containing lepidolite to -100 mesh, accounting for 50% to 70%, and adding water to prepare a slurry with a mass concentration of 25 to 45%, adding a depressant sodium hexametaphosphate, stirring, and then adding a lepidolite flotation collector, stirring, and performing a lepidolite flotation operation to obtain a lepidolite rough concentrate and a roughing tailing;

[0017] S2, the lepidolite coarse concentrate obtained in step S1 is subjected to two rounds of beneficiation. During the beneficiation process, an inhibitor, sodium hexametaphosphate, is added, and the selected middlings are returned to the previous level in sequence to finally obtain the lepidolite concentrate;

[0018] S3, the roughing tailings obtained in step S1 are scavenged twice. During the scavenging process, a lepidolite flotation collector is added. The scavenged tailings are returned to the previous level in sequence. The scavenged tailings are tailings.

[0019] In step S1, the Li2O grade in the ore is 1.0%-1.5%, the amount of sodium hexametaphosphate used is 500-1000 g / t, and the sodium hexametaphosphate is added and stirred for 5-10 minutes.

[0020] In the step S1, the amount of the lepidolite flotation collector is 200-400 g / t, and the mixture is stirred for 5-10 minutes after the lepidolite flotation collector is added.

[0021] In said step S2, the inhibitor sodium hexametaphosphate is added each time during the two concentrations, and the amount of the inhibitor sodium hexametaphosphate is 0.2 to 0.8 times the amount of the inhibitor sodium hexametaphosphate in step S1; the Li2O grade in the finally obtained lepidolite concentrate is not less than 3%, and the Li2O recovery rate is not less than 85%.

[0022] In the step S3, a lepidolite flotation collector is added each time during the two sweeps, and the amount of the lepidolite flotation collector used is 0.4 to 0.8 times the amount of the lepidolite flotation collector used in the step S1.

[0023] In the above scheme, the main components of the lepidolite collector are 3-[N, N-dimethyl, N-octadecyl] ammonium group and 2-hydroxypropanesulfonate, which have a strong collecting effect on lepidolite. It also contains etheramine, lauryl polyoxyethylene ether and triethanolamine oleic acid soap, which further enhance the collecting effect, selectivity and foaming properties, and improve the lepidolite collecting effect.

[0024] 3-[N, N-dimethyl, N-octadecyl] ammonium, 2-hydroxypropanesulfonate is an anionic surfactant with sulfonic acid anions and quaternary ammonium cations in its molecules and a net charge of zero. Therefore, it has strong water solubility and foaming properties, overcoming the defects of traditional anionic collectors such as fatty acids and sulfonates, such as poor water solubility and insufficient activity at low temperatures. At the same time, the molecule also contains carboxyl groups, which have a cleaning effect on the fine mud covering the surface of lepidolite minerals, promoting its adsorption on the surface of lepidolite, and is therefore insensitive to water quality and mineral mud. Etheramine is a cationic surfactant with rich ether groups in its molecules. Therefore, it has a low melting point and high water solubility, and is easy to diffuse and adsorb on the surface of the lepidolite minerals during the flotation process. The negatively charged surface of lithium mica minerals has the advantages of strong selectivity and good foam fluidity; after the anionic and cationic surfactants are fully mixed, the two will form an association, which can effectively reduce the critical micelle concentration and surface tension in the system during the lithium mica flotation process, effectively reduce the amount of collector used, and enhance the selectivity of the collector; lauryl alcohol polyoxyethylene ether and triethanolamine oleic acid soap are both non-ionic surfactants with strong emulsifying properties, high acid and alkali resistance, stable properties, easy acquisition, and low cost. At the same time, the two can effectively enhance the activity of anionic and cationic surfactants, reduce the critical micelle concentration of the system, improve water solubility and low-temperature resistance, and enhance the collection ability, selectivity and applicability of the collector.

[0025] Compared with the prior art, the above technical solution has at least the following beneficial effects:

[0026] The above scheme rationally compounds 3-[N,N-dimethyl, N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl polyoxyethylene ether and triethanolamine oleic acid soap, thereby generating synergistic benefits during the flotation process, greatly reducing the dosage of reagents, improving adaptability to water quality and ore slime, and effectively avoiding the use of sulfuric acid. Furthermore, the scheme has good foaming properties and good foam fluidity, and has efficient selective capture performance for low-grade fine-grained lepidolite. It achieves full-grained-size selection of lepidolite in an in-situ pulp flotation environment without desliming, and is beneficial to improving the concentrate grade and recovery rate of lepidolite. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The present invention is a process flow chart of a method for applying a lepidolite selective flotation collector. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The invention provides a lepidolite selective flotation collector and an application method thereof.

[0031] The lepidolite flotation collector is prepared by mixing 3-[N,N-dimethyl, N-octadecyl]ammonium group, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleate soap.

[0032] The mass ratio of 3-[N, N-dimethyl, N-octadecyl]ammonium group, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleic acid soap is 4.0-5.0:2.0-2.5:1.0-1.5:2.0-2.5.

[0033] The preparation method of the collector is as follows:

[0034] 3-[N, N-dimethyl, N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleic acid soap are mixed according to mass ratio, and then emulsified and dispersed to obtain a uniform viscous suspension, which is a lepidolite flotation collector.

[0035] like Figure 1 As shown, the application method of the collector comprises the following steps:

[0036] S1, crushing and grinding lepidolite ore containing 1.0%-1.5% Li2O grade to -100 mesh accounting for 50%-70%, adding water to prepare a slurry with a mass concentration of 25-45%, adding sodium hexametaphosphate as an inhibitor, stirring, then adding a lepidolite flotation collector, stirring, and performing a lepidolite flotation operation to obtain a lepidolite rough concentrate and a roughing tailing;

[0037] S2, the lepidolite coarse concentrate obtained in step S1 is subjected to two rounds of beneficiation. During the beneficiation process, an inhibitor, sodium hexametaphosphate, is added, and the selected middlings are returned to the previous level in sequence to finally obtain the lepidolite concentrate;

[0038] S3, the roughing tailings obtained in step S1 are scavenged twice. During the scavenging process, a lepidolite flotation collector is added. The scavenged tailings are returned to the previous level in sequence. The scavenged tailings are tailings.

[0039] The following describes this with reference to specific embodiments.

[0040] Example 1

[0041] The lepidolite collector used in this example was prepared with 3-[N,N-dimethyl,N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether, and triethanolamine oleate soap in a mass ratio of 5:2:1:2. This collector was used for flotation of lepidolite ore. In this example, the ore contained 1.19% Li2O. Lithium was primarily present in the form of lepidolite.

[0042] The specific steps are as follows:

[0043] First, add 500g / t of sodium hexametaphosphate to the lepidolite ore and stir for 5 minutes to suppress and disperse the gangue minerals. Then, add 200g / t of lepidolite collector and stir for 5 minutes before roughing the lepidolite.

[0044] The obtained lepidolite coarse concentrate is subjected to a closed-circuit beneficiation process of two concentrations and two scavengings to obtain lepidolite concentrate.

[0045] During the selection process, the amount of sodium hexametaphosphate added in the first selection was 100g / t, and the amount of sodium hexametaphosphate added in the second selection was 100g / t. During the scavenging process, the amount of lepidolite collector used in the first scavenging process was 80g / t, and the amount of lepidolite collector used in the second scavenging process was 120g / t.

[0046] The results of Example 1 are shown in Table 1.

[0047] Table 1 Example 1 Results (%)

[0048]

[0049]

[0050] As shown in Table 1, the flotation of lepidolite ore by using the lepidolite collector of the present invention can still achieve good mineral processing indicators at a relatively low dosage. In a laboratory closed-circuit test, a lepidolite concentrate with a Li2O grade of 3.22% and a recovery rate of 89.86% can be obtained.

[0051] Example 2

[0052] The lepidolite collector used in this example was prepared using 3-[N,N-dimethyl,N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether, and triethanolamine oleate soap in a mass ratio of 4:2.5:1.5:2. This collector was used for flotation of lepidolite ore. In this example, the ore contained 1.23% Li2O. Lithium was primarily present in the form of lepidolite.

[0053] The specific steps are as follows:

[0054] First, 1000g / t of sodium hexametaphosphate was added to the lepidolite ore and stirred for 5 minutes to suppress and disperse the gangue minerals. Then, 400g / t of lepidolite collector was added and stirred for 5 minutes before rough selection of lepidolite.

[0055] The obtained lepidolite coarse concentrate is subjected to a closed-circuit beneficiation process of two concentrations and two scavengings to obtain lepidolite concentrate.

[0056] During the beneficiation process, 800g / t of sodium hexametaphosphate was added to the first beneficiation and 400g / t was added to the second beneficiation. During the scavenging process, 160g / t of lepidolite collector was used in the first scavenging process and 320g / t in the second scavenging process.

[0057] Table 2 Example 2 Results

[0058] Product Name Yield <![CDATA[Li2O grade]]> <![CDATA[Recovery rate of Li2O]]> Lepidolite concentrate 30.31 3.61 88.96 tailings 69.69 0.19 11.04 raw ore 100.00 1.23 100.00

[0059] As shown in Table 2, the flotation of lepidolite ore by using the lepidolite collector of the present invention can still achieve good mineral processing indicators at a lower dosage. The laboratory closed-circuit test can obtain a lepidolite concentrate with a Li2O grade of 3.61% and a recovery rate of 88.96%.

[0060] Example 3

[0061] The lepidolite collector used in this example was prepared using 3-[N,N-dimethyl,N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether, and triethanolamine oleate soap in a mass ratio of 4:2:1.5:2.5. This collector was used for flotation of lepidolite ore. In this example, the ore contained 1.48% Li₂O. The lithium was primarily present in the form of lepidolite.

[0062] The specific steps are as follows:

[0063] First, 1000g / t of sodium hexametaphosphate was added to the lepidolite ore and stirred for 5 minutes to suppress and disperse the gangue minerals. Then, 300g / t of lepidolite collector was added and stirred for 5 minutes before rough selection of lepidolite.

[0064] The obtained lepidolite coarse concentrate is subjected to a closed-circuit beneficiation process of two concentrations and two scavengings to obtain lepidolite concentrate.

[0065] During the selection process, 800g / t of sodium hexametaphosphate was added to the first selection, and 200g / t was added to the second selection. During the scavenging process, the amount of lepidolite collector used was 120g / t for the first scavenging process and 240g / t for the second scavenging process.

[0066] Table 3 Example 3 results

[0067] Product Name Yield <![CDATA[Li2O grade]]> <![CDATA[Recovery rate of Li2O]]> Lepidolite concentrate 35.31 3.75 89.47 tailings 64.69 0.24 10.53 raw ore 100.00 1.48 100.00

[0068] As shown in Table 3, the flotation of lepidolite ore by using the lepidolite collector of the present invention can still achieve good mineral processing indicators at a lower dosage. The laboratory closed-circuit test can obtain a lepidolite concentrate with a Li2O grade of 3.75% and a recovery rate of 89.47%.

[0069] Example 4

[0070] The lepidolite collector used in this example was prepared using 3-[N,N-dimethyl,N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether, and triethanolamine oleate soap in a mass ratio of 5:2:1:2. This collector was used for flotation of lepidolite ore. In this example, the ore contained 1.37% Li₂O. The lithium was primarily present in the form of lepidolite.

[0071] The specific steps are as follows:

[0072] First, add 800g / t of sodium hexametaphosphate to the lepidolite ore and stir for 5 minutes to suppress and disperse the gangue minerals. Then, add 300g / t of lepidolite collector and stir for 5 minutes before rough selection of lepidolite.

[0073] The obtained lepidolite coarse concentrate is subjected to a closed-circuit beneficiation process of two concentrations and two scavengings to obtain lepidolite concentrate.

[0074] During the selection process, 400g / t of sodium hexametaphosphate was added to the first selection, and 200g / t was added to the second selection. During the scavenging process, 120g / t of lepidolite collector was used for the first scavenging process, and 240g / t for the second scavenging process.

[0075] Table 4 Example 4 Results

[0076] Product Name Yield <![CDATA[Li2O grade]]> <![CDATA[Recovery rate of Li2O]]> Lepidolite concentrate 34.31 3.57 89.41 tailings 65.69 0.22 10.59 raw ore 100.00 1.37 100.00

[0077] As shown in Table 4, by using the lepidolite collector of the present invention to flotate lepidolite ore, good mineral processing indicators can still be obtained at a lower dosage. In a laboratory closed-circuit test, a lepidolite concentrate with a Li2O grade of 3.57% and a recovery rate of 89.41% can be obtained.

[0078] Example 5

[0079] The lepidolite collector used in this example was prepared using 3-[N,N-dimethyl,N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether, and triethanolamine oleate soap in a mass ratio of 5:2:1:2. This collector was used for flotation of lepidolite ore. In this example, the ore contained 1.02% Li₂O. The lithium was primarily present in the form of lepidolite.

[0080] The specific steps are as follows:

[0081] First, 1000g / t of sodium hexametaphosphate was added to the lepidolite ore and stirred for 5 minutes to suppress and disperse the gangue minerals. Then, 200g / t of lepidolite collector was added and stirred for 5 minutes before rough selection of lepidolite.

[0082] The obtained lepidolite coarse concentrate is subjected to a closed-circuit beneficiation process of two concentrations and two scavengings to obtain lepidolite concentrate.

[0083] During the selection process, 800g / t of sodium hexametaphosphate was added to the first selection, and 300g / t was added to the second selection. During the scavenging process, the amount of lepidolite collector used was 80g / t for the first scavenging process and 160g / t for the second scavenging process.

[0084] Table 5 Example 5 Results

[0085] Product Name Yield <![CDATA[Li2O grade]]> <![CDATA[Recovery rate of Li2O]]> Lepidolite concentrate 30.21 3.01 89.15 tailings 69.79 0.16 10.85 raw ore 100.00 1.02 100.00

[0086] As shown in Table 5, the flotation of lepidolite ore by using the lepidolite collector of the present invention can still achieve good mineral processing indicators at a lower dosage. The laboratory closed-circuit test can obtain a lepidolite concentrate with a Li2O grade of 3.07% and a recovery rate of 89.15%.

[0087] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A lepidolite selective flotation collector, characterized in that: It is prepared by mixing 3-[N, N-dimethyl, N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleate soap; The mass ratio of 3-[N, N-dimethyl, N-octadecyl]ammonium group, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleic acid soap is 4.0-5.0:2.0-2.5:1.0-1.5:2.0-2.

5.

2. The lepidolite selective flotation collector according to claim 1, wherein The collector preparation method is as follows: 3-[N, N-dimethyl, N-octadecyl]ammonium, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleic acid soap are mixed according to mass ratio, and then emulsified and dispersed to obtain a uniform viscous suspension, which is a lepidolite flotation collector.

3. The lepidolite selective flotation collector according to claim 1, wherein The mass ratio of the 3-[N, N-dimethyl, N-octadecyl]ammonium group, 2-hydroxypropanesulfonate, etheramine, lauryl alcohol polyoxyethylene ether and triethanolamine oleic acid soap is 5:2:1:

2.

4. The lepidolite selective flotation collector according to claim 1, wherein The etheramine is a C8-C10 etheramine.

5. The lepidolite selective flotation collector according to claim 2, wherein The emulsification and dispersion is carried out in a high shear emulsifier, the rotation speed of the high shear emulsifier is not less than 7000 rpm, and the emulsification and dispersion time is 15 to 20 minutes.

6. The application method of the lepidolite selective flotation collector according to claim 1, wherein The steps are as follows: S1. Crushing and grinding ore containing lepidolite to -100 mesh, accounting for 50% to 70%, and adding water to prepare a slurry with a mass concentration of 25 to 45%, adding a depressant sodium hexametaphosphate, stirring, and then adding a lepidolite flotation collector, stirring, and performing a lepidolite flotation operation to obtain a lepidolite rough concentrate and a roughing tailing; S2, the lepidolite coarse concentrate obtained in step S1 is subjected to two rounds of beneficiation. During the beneficiation process, an inhibitor, sodium hexametaphosphate, is added, and the selected middlings are returned to the previous level in sequence to finally obtain the lepidolite concentrate; S3, the roughing tailings obtained in step S1 are scavenged twice. During the scavenging process, a lepidolite flotation collector is added. The scavenged tailings are returned to the previous level in sequence. The scavenged tailings are tailings.

7. The application method of the lepidolite selective flotation collector according to claim 6, wherein: In step S1, the Li2O grade in the ore is 1.0%-1.5%, the amount of sodium hexametaphosphate used is 500-1000 g / t, and the sodium hexametaphosphate is added and stirred for 5-10 minutes.

8. The application method of the lepidolite selective flotation collector according to claim 6, wherein: In the step S1, the amount of the lepidolite flotation collector is 200-400 g / t, and the mixture is stirred for 5-10 minutes after the lepidolite flotation collector is added.

9. The application method of the lepidolite selective flotation collector according to claim 6, wherein: In said step S2, the inhibitor sodium hexametaphosphate is added each time during the two rounds of selection, and the amount of the inhibitor sodium hexametaphosphate is 0.2 to 0.8 times the amount of the inhibitor sodium hexametaphosphate in step S1; The Li2O grade in the finally obtained lepidolite concentrate is not less than 3%, and the Li2O recovery rate is not less than 85%.

10. The application method of the lepidolite selective flotation collector according to claim 6, characterized in that: In the step S3, a lepidolite flotation collector is added each time during the two sweeps, and the amount of the lepidolite flotation collector used is 0.4 to 0.8 times the amount of the lepidolite flotation collector used in the step S1.

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