Lithium ore flotation method

Abstract

The invention belongs to the field of mineral flotation, and particularly relates to a lithium ore flotation method which comprises the following steps: carrying out flotation on to-be-separated ore containing lithium ore in a flotation reagent containing an imgabs0 # collecting agent in a formula 1 # to obtain lithium ore flotation concentrate; in the formula, R1 is alkyl of C10 to C20; x is an alkylene group with a carbon number of 1 to 3; r2 is H, a C1-C6 alkyl group or a substituted alkyl group; the substituted alkyl group is a group with a substituent group on a C1-C6 alkyl carbon chain, and the substituent group comprises at least one of an acylamino group, an aminoacyl group, an amino group, a hydroxyl group and an amidino group; m is H, Na, K or NH4 < + >. The innovative research shows that the compound shown in the formula 1 is innovatively adopted as the lithium ore collecting agent, the surface characteristics of the lithium ore can be accidentally matched, and the excellent lithium ore collecting effect and selectivity can be obtained.

Description

Technical Field

[0001] The present invention belongs to the field of mineral flotation, and in particular to the field of lithium ore flotation. Background Art

[0002] Lithium ore is a strategic mineral resource and a vital metal raw material supporting modern industry, national defense, and high-tech sectors. While domestic lithium resources are relatively abundant, external dependence remains high due to limitations such as lithium extraction technology. With the rapid development of high-tech and new energy industries, researching efficient lithium resource utilization technologies and improving their comprehensive utilization rate have become critical issues in resource development and sustainable development. Flotation technology is currently the primary method for purifying metals from ores, with collectors playing a key role influencing mineral flotation performance.

[0003] Fatty acids, as anionic collectors, have active carboxylic acid groups and can form insoluble salts with most metals. They are also inexpensive and are therefore widely used in the flotation of various minerals. However, fatty acid collectors have poor selectivity, and as ore resources become increasingly poor and fine, it is difficult to achieve good flotation separation effects using a single collector in the flotation of most actual mines. Therefore, many combined reagents have been used in recent years. The literature reports that the combined use of oleic acid and dodecylamine can effectively separate spodumene from feldspar and quartz under alkaline conditions (Luo Liu, Wang Yuhua, Zhu Guangli, Yu Fushun, Gao Danxiao, Lu Dongfang, Zheng Xiayu. Application and mechanism of mixed collector flotation of spodumene [J]. Journal of the Chinese Society of Nonferrous Metals, 2020, 30(03): 675-683.). The literature reports that when a mixed collector with a molar ratio of sodium oleate to dodecylsuccinamide of 5:1 is used to flotate spodumene, a better collection capacity can be obtained, and the flotation effect is better than any single collector (Liu Ruohua, Sun Wei, Feng Mu, Mei Zhi, Jin Jiao. Mechanism of combined collector flotation of spodumene [J]. Journal of the Chinese Society of Nonferrous Metals, 2018, 28(03): 612-617.) Patent CN115582223A discloses a mixed collector containing industrial oleic acid, kerosene and alcohol for the flotation of lithium ore, which can achieve better flotation indicators. Patent CN118807988A discloses a mixed collector composed of dodecylamine, acetic acid and sodium oleate as a collector for separating spodumene chlorite, which can achieve effective separation of spodumene chlorite from gibbsite and kaolinite in complex lithium ore. However, due to the shortcomings of oleic acid collectors such as poor selectivity, low solubility and poor low-temperature resistance, it is difficult to prepare combined collectors. Multifunctional collectors, with their precise selectivity, good solubility and efficient collection performance under the synergistic effect of multiple functional groups, can achieve efficient flotation recovery and separation of target minerals in complex flotation environments, which is of great significance for the processing and utilization of mineral resources. Summary of the Invention

[0004] In view of the above technical problems existing in the prior art, the purpose of the present invention is to provide a flotation method for lithium ore, aiming to improve the collection effect and selectivity of lithium ore.

[0005] A flotation method for lithium ore, in which the ore to be selected containing lithium ore is flotated in a flotation reagent containing a collector of Formula 1 to obtain a lithium ore flotation concentrate;

[0006]

[0007] The R1 is a hydrocarbon group of C 10 ~C 20 ; the X is an alkylene group of C1-C3; the R2 is H, an alkyl group of C1-C6 or a substituted alkyl group; the substituted alkyl group is a group with a substituent on the alkyl carbon chain of C1-C6, and the substituent includes at least one of an amide group, an aminoacyl group, an amino group, a hydroxyl group, and an amidino group;

[0008] The M is H, Na, K or NH4 + .

[0009] The innovative research of the present invention shows that innovatively using the compound of Formula 1 as a collector for lithium ore can unexpectedly adapt to the surface characteristics of lithium ore, and excellent collection effect and selectivity of lithium ore can be obtained.

[0010] In the present invention, the spatial domain constructed between CO-NH-X-COO in the structure of Formula 1 is the key to synergistically improving the targeted binding ability of lithium ore, and improving its collection ability and selectivity. The research of the present invention also shows that further optimizing its structure such as R2 is expected to further improve the adaptability and synergy of the domain to lithium ore, and contribute to further improving the collection ability and selectivity of lithium ore. In addition, the collector described in the present invention takes into account excellent foaming property, low-temperature adaptability and biodegradability, and can still obtain good collection effect at low temperature and without a foaming agent.

[0011] In the present invention, the hydrocarbon group can be an aliphatic hydrocarbon group and a cycloalkyl group. The aliphatic hydrocarbon group is, for example, at least one of an alkyl group, an alkenyl group, and an alkynyl group. The cycloalkyl group is, for example, a monocyclic alkyl group of three to six members, or a spiro ring or a bridged ring group formed by sharing carbon atoms or carbon bonds of the monocyclic ring group. Any hydrogen atom in the aliphatic hydrocarbon group, cycloalkane, and aromatic hydrocarbon group can be further monosubstituted or polysubstituted with the same or different halogen, hydroxyl, cyano, nitro, and alkoxy groups.

[0012] In the present invention, in Formula 1, the R1 is a saturated alkyl group of C 10 ~C 20 or a carbon chain with 1-2 unsaturated double bonds.

[0013] In the present invention, X is methylene or ethylene.

[0014] In the present invention, R2 is H, or a substituted alkyl group with an acylamino or amino substituent.

[0015] For example, the collector of formula 1 in the present invention includes at least one of formula 1A and formula 1B;

[0016]

[0017]

[0018] In formula 1A and formula 1B, R1 is a saturated or partially unsaturated carbon chain of C 10 ~C 20 (for example, a straight-chain carbon chain with 1 to 2 unsaturated double bonds); X is methylene or ethylene;

[0019] Y is a saturated carbon chain with 1 to 5 carbon atoms; R3 is an acylamino or amino group.

[0020] Preferably, the collector of formula 1 includes a composite collector of formula 1A and formula 1B with a molar ratio of 1 to 5:1. Research in the present invention shows that the preferred composite collector of formula 1A and formula 1B helps to further improve the collection effect of lithium ore.

[0021] In the present invention, formula 1 is obtained by a condensation reaction of formula 2 and formula 3;

[0022]

[0023] During the condensation reaction, an acid-binding agent is also allowed to be added. The acid-binding agent includes, for example, any one of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, triethylamine, sodium tert-butoxide, sodium methoxide, and sodium ethoxide. In the present invention, the molar ratio of formula 2 to formula 3 can be 1:1 to 3. The temperature during the reaction process is 10 to 30 °C; the time is 2 to 8 h.

[0024] In the present invention, in the flotation reagent, according to needs, a flotation aid can also be included. The flotation aid includes at least one of a foaming agent, a pH regulator, and an inhibitor.

[0025] In the present invention, the foaming agent, pH regulator, and inhibitor can all be well-known in the industry.

[0026] In the present invention, the lithium ore is at least one of spodumene, lepidolite, amblygonite, montebrasite, pennantite, and eucryptite. Particularly preferably, it is spodumene. Research in the present invention shows that the compound of Formula 1 in the present invention can particularly adapt to the physical and chemical characteristics of spodumene, and better collecting ability and selectivity can be obtained for it.

[0027] Benefiting from the strong collecting ability and selectivity of the Formula 1, the flotation method of the present invention can be applicable to highly slime, low-grade lithium ores and lithium ores associated with feldspar that are difficult to float in the industry. For example, the lithium ore is a mineral in which lithium ore and feldspar are intergrown. Further, in the lithium ore, the grade of Li2O is 1.0% - 1.5%.

[0028] In the present invention, the lithium ore and gangue minerals such as feldspar all belong to aluminosilicate minerals, and the surface properties of the minerals are similar. The adsorption differences of existing collectors on the mineral surface are small, resulting in difficult mineral separation. There are a large number of primary slime ores in the lithium deposit. The fine slime has strong adsorption characteristics, consumes a large amount of reagents, and the fine slime adsorbs on the mineral surface, further reducing the floatability difference between the minerals. The grade of Li2O in the spodumene ore is 1.0% - 1.5%, with a low grade and difficult separation.

[0029] In the present invention, the dosage of the collector of Formula 1 can be adjusted as needed. For example, it can be 50 - 3000 g / t; further, it can be 1000 - 1500 g / t.

[0030] In the present invention, the pH of the pulp in the flotation process can be reasonably controlled as needed. For example, it can be 5 - 10, and further, it can be 6 - 8.

[0031] In the present invention, the temperature of the flotation process is 5 - 50 °C. For example, it can be a low temperature of 5 - 10 °C, or a room temperature of 25 - 30 °C. Particularly, benefiting from the innovative use of the collector of Formula 1, good collecting effect can still be obtained under low-temperature conditions, and it has more significant advantages in low-temperature collection compared with the existing collection methods.

[0032] Beneficial effects:

[0033] (1) The structural domain of NC-NH-X-COO in the molecular structure of the lithium ore flotation collector provided by the present invention can improve the chelating ability of lithium, thereby enhancing the adsorption of the collector on the surface of lithium minerals, and can improve the collecting performance and selectivity of the collector. In addition, the lithium ore flotation collector provided by the present invention has certain foaming properties, and has good low-temperature and easy degradability, and can realize environmentally friendly flotation under low foam and low temperature.

[0034] (2) Research in the present invention shows that optimizing the substituents of the Formula 1 structure can further improve the collecting effect of lithium ores, especially spodumene. Description of the Drawings

[0035] Figure 1 is the mass spectrum of Formula A;

[0036] Figure 2 is the infrared spectrum of Formula A;

[0037] Figure 3 is the 1H NMR spectrum of Formula A;

[0038] Figure 4 is the mass spectrum of Formula B;

[0039] Figure 5 is the 1H NMR spectrum of Formula B;

[0040] Figure 6 is the mass spectrum of Formula C;

[0041] Figure 7 is the 1H NMR spectrum of Formula C;

[0042] Figure 8 is the mass spectrum of Formula D;

[0043] Figure 9 is the 1H NMR spectrum of Formula D;

[0044] Figure 10 is the 1H NMR spectrum of Formula E;

[0045] Figure 11 is the single mineral flotation flow chart;

[0046] Figure 12 is the flotation process flow chart of lepidolite ore;

[0047] Figure 13 Infrared spectra of spodumene before and after reaction with Formula A;

[0048] Figure 14 XPS spectra of spodumene before and after reaction with Formula A. Detailed Embodiments

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention. Unless otherwise defined, all technical terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0050] The collector of formula 1 according to the present invention may have the following optional structures, for example:

[0051]

[0052] R is a hydrocarbon group of C 10 ~C 20 .

[0053] n1 is an integer from 0 to 6 (for example, 0, 1, 2, 3, 4, 5 or 6); n2 is an integer from 0 to 6 (for example, 0, 1, 2, 3, 4, 5 or 6);

[0054] M is H + , Na + , K + or NH4 + .

[0055] In the present invention, the collector of formula 1 can be prepared by an acylation reaction. For example, the synthetic idea of an optional scheme is as follows:

[0056]

[0057] In order to further verify the performance of the collector of the present invention, in the following cases, the following structural compounds are taken as typical cases.

[0058]

[0059]

[0060] All parts and percentages in the examples refer to mass unless otherwise specified.

[0061] Example 1: Preparation of Formula A

[0062] Mix 2.27 g of Formula 3A ( with a content of 99%) and 40 mL of water and add them to a reaction vessel. Then add 3.33 g of sodium hydroxide and stir to fully dissolve Formula 3A. Mix 6.14 g of Formula 2A ( with a content of 98%) with 20 mL of tetrahydrofuran and add them to a constant pressure dropping funnel. Slowly drop them into the reaction vessel at 10°C. After the addition is completed, react at 10°C for 1 h, then raise the temperature to 25°C and continue to react for 4 h. After the reaction is completed, distill off tetrahydrofuran under reduced pressure. Then adjust the pH to about 2 with a 3 mol / L hydrochloric acid solution. Let it stand until a solid precipitates, and then filter to obtain a white solid product of Formula A.

[0063] The mass spectrum of Formula A is as Figure 1As shown, the peak with a mass-to-charge ratio of 338.2703 in the spectrogram is the [M-H] ion peak, and the peak with a mass-to-charge ratio of 677.5479 is the [2M-H] ion peak, with a theoretical molecular weight of 339.2773.

[0064] Example 2: Preparation of Formula B

[0065] Mix 2.70 g of Formula 3B ( with a content of 99%) and 40 mL of water and add them to a reaction vessel. Then add 3.33 g of sodium hydroxide and stir to fully dissolve Formula 3B. Mix 6.14 g of Formula 2A (with a content of 98%) with 20 mL of tetrahydrofuran and add it to a constant-pressure dropping funnel. Slowly drop it into the reaction vessel at 10°C. After the addition is complete, react at 10°C for 1 h, then raise the temperature to 25°C and continue to react for 4 h. After the reaction is completed, distill off tetrahydrofuran under reduced pressure. Then adjust the pH to about 2 with 3 mol / L hydrochloric acid solution. Let it stand until a solid precipitates, and then filter to obtain the white solid product Formula B.

[0066] The mass spectrum of Formula B is as Figure 4 shown. The peak with a mass-to-charge ratio of 352.2812 in the spectrogram is the [M-H] ion peak, and the peak with a mass-to-charge ratio of 705.5688 is the [2M-H] ion peak, with a theoretical molecular weight of 353.2930.

[0067] Example 3: Preparation of Formula C

[0068] Mix 4.43 g of Formula 3C ( with a content of 99%) and 40 mL of water and add them to a reaction vessel. Then add 4.17 g of sodium hydroxide and stir to fully dissolve Formula 3C. Add 60 mL of tetrahydrofuran. Use a constant-pressure dropping funnel to slowly drop 8.37 g of Formula 2A (with a content of 98%) into the reaction vessel at 10°C. After the addition is complete, react at 10°C for 1 h, then raise the temperature to 25°C and continue to react for 4 h. After the reaction is completed, adjust the pH to about 2 with 3 mol / L hydrochloric acid solution. The mixed solution after adjusting the pH is extracted with ethyl acetate, and the organic phases are combined and the solvent is distilled off under reduced pressure to obtain a solid product, which is the target product Formula C.

[0069] The mass spectrum of Formula C is as Figure 6 shown. The peak with a mass-to-charge ratio of 409.3059 in the spectrogram is the [M-H] ion peak, and the peak with a mass-to-charge ratio of 819.6220 is the [2M-H] ion peak, with a theoretical molecular weight of 410.3145.

[0070] Example 4: Preparation of Formula D

[0071] 4.43g of formula 3C (content 99%) and 40mL of water were mixed and added to the reaction vessel, and then 4.17g of sodium hydroxide was added and stirred to fully dissolve the formula 3C, and 60mL of tetrahydrofuran was added. 7.81g of formula 2B ( The mixture was slowly dripped into the reaction vessel at 10°C. After the addition was completed, the reaction was carried out at 10°C for 1 hour, then the temperature was raised to 25°C and the reaction was continued for 4 hours. After the reaction was completed, the pH was adjusted to about 2 with 3 mol / L hydrochloric acid solution. The pH-adjusted mixture was extracted with ethyl acetate, the organic phases were combined, and the solvent was removed by distillation under reduced pressure to obtain a solid product, which is the target product of formula D.

[0072] The mass spectrum of formula D is as follows Figure 8 As shown in the spectrum, the peak with a mass-to-charge ratio of 383.2950 is the [MH] ion peak, and the peak with a mass-to-charge ratio of 767.6040 is the [2M-H] ion peak, and its theoretical molecular weight is 384.2988.

[0073] Example 5: Preparation of Formula E

[0074] 4.43g of formula 3C (content 99%) and 40mL of water were mixed and added to the reaction vessel, and then 4.17g of sodium hydroxide was added and stirred to fully dissolve the formula 3C, and 60mL of tetrahydrofuran was added. 6.87g of formula 2C ( The mixture was slowly dripped into the reaction vessel at 10°C. After the addition was completed, the reaction was carried out at 10°C for 1 hour, then the temperature was raised to 25°C and the reaction was continued for 4 hours. After the reaction was completed, the pH was adjusted to about 2 with 3 mol / L hydrochloric acid solution. The pH-adjusted mixture was extracted with ethyl acetate, the organic phases were combined, and the solvent was removed by distillation under reduced pressure to obtain a solid product, which is the target product of formula E.

[0075] The products obtained in Examples 1 to 5 were separated and purified, and the obtained products were characterized by H NMR and IR spectra. The H NMR results were as follows: Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 、 Figure 10 As shown in Table 1, the infrared spectrum test results are as follows Figure 2 , as shown in Table 2.

[0076] Table 1 Analysis of H NMR spectrum

[0077]

[0078] Table 2 Infrared spectrum analysis

[0079]

[0080] Example 6

[0081] Under the conditions of pH 7 and a rotation speed of 1650 r / min, a flotation experiment was conducted on 2 g of spodumene single mineral with a particle size of 200 - 400 mesh in an XFGⅡ5 - 35g type aerated flotation cell (the temperature of other groups was 35 °C except for No. 6 with a temperature of 5 °C). The flotation flow chart is as Figure 11 shown. The flotation results are shown in Table 3.

[0082] Table 3 Comparative test results of collectors for flotation of spodumene single mineral

[0083]

[0084]

[0085] The test results in Table 3 show that when the concentration is 5×10 -4 mol·L -1 , the flotation recovery rates of the collectors of Formula A and Formula B prepared in the present invention for spodumene are 46.85 and 41.71 percentage points higher than that of oleic acid respectively; when the concentration is 5×10 -4 mol·L -1 , the flotation recovery rate of the collector of Formula C prepared in the present invention for spodumene is 88.21%. It shows that the collectors prepared in the present invention have better collecting performance for spodumene than oleic acid.

[0086] Compared with Example 6, when using the collector of the present invention to conduct flotation on albite single mineral, the flotation conditions are the same as those in Example 6, and the flotation results are shown in Table 4:

[0087] Table 4 Comparative test results of collectors for flotation of albite single mineral

[0088]

[0089] It can be seen from Table 3 and Table 4 that the collector described in the present invention has good collecting selectivity for spodumene.

[0090] Example 7

[0091] Compared with Example 6, the difference is only that the collector used is the combined collector shown in Table 5 below, and other operations and parameters are the same as those in Example 6. The results are shown in Table 5:

[0092] Table 5 Comparative test results of combined collectors for flotation of spodumene single mineral

[0093]

[0094] By comparing Example 6 and Example 7, using the combined agent of the present invention can unexpectedly further achieve synergy and obtain a better collecting effect for spodumene.

[0095] Example 8

[0096] The content of Li2O in the lepidolite ore is 0.16%, and other components include SiO2, CaO, MgO, etc. Each time, 500 g of ore sample is taken and ground in an XMQ-Φ240×90 conical ball mill, and the grinding pulp concentration is 60%. In the flotation operation, a 1LXFD-63 single-cell flotation machine is used for roughing, and the process as Figure 12 is adopted, and only one roughing is carried out. The reagent regime is as follows: the dosage of sodium carbonate is 1600 g / t, the dosage of the inhibitor sodium hexametaphosphate is 400 g / t, and the dosage of the collector is 1200 g / t. The flotation results are shown in Table 6.

[0097] Table 6 Comparison test results of collector flotation for a certain lepidolite ore

[0098]

[0099] The test results in Table 6 show that the flotation recovery rate of the collector of formula A prepared by the present invention for Li2O is 19.34 percentage points higher than that of the oleic acid collector, indicating that the flotation performance of the collector of formula A for lithium ore is superior to that of oleic acid.

[0100] Principle

[0101] Taking the collector of formula A as an example, the infrared spectrum and XPS spectrum before and after its reaction with spodumene in Example 6 are shown in Figure 13 and Figure 14 .

[0102] It can be seen from the infrared spectrum that the absorption peak of 3313 cm -1 in formula A is the N-H stretching vibration peak, and the absorption peak of 1645 cm -1 is the C=O stretching vibration peak in -CONH-, and the absorption peak of 1550 cm -1 is the C-N stretching vibration peak. After the reaction of formula A with spodumene, the absorption peak of 3313 cm -1 shifts to 3338 cm -1 , and the absorption peaks at 1645 and 1550 cm -1 shift to lower frequencies (1629 and 1535 cm -1 ), indicating that both C=O and -NH in -CONH- chemically react with the surface of spodumene.

[0103] It can be seen from the XPS spectrogram that the N1s spectral peaks in Formula A are located at 399.88 and 401.88 eV, which are attributed to -CONH- and hydrogen-bonded nitrogen, respectively. After Formula A reacts with spodumene, the spectral peaks located at 399.88 and 401.88 eV shift to 399.78 and 401.62 eV, respectively, indicating that the electron density of the N atom has changed and a chemical reaction has occurred with the surface of spodumene. In addition, a new peak appears at 397.82 eV, which is caused by the binding of the N atom to the Al site on the surface of spodumene.

[0104] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or alterations derived therefrom are still within the protection scope of the present invention.

Claims

1. A flotation method for lithium ore, characterized in that, The ore to be beneficiated containing lithium ore is subjected to flotation in a flotation reagent containing a collector of Formula 1 to obtain a lithium ore flotation concentrate; The described R1 is a hydrocarbon group of C 10 ~C 20 ; the described X is an alkylene group of C1 to C3; the described R2 is H, an alkyl group of C1 to C6 or a substituted alkyl group; the substituted alkyl group is a group with a substituent on the alkyl carbon chain of C1 to C6, and the substituent includes at least one of an amide group, an aminoacyl group, an amino group, a hydroxyl group, and an amidino group; M is H, Na, K or NH4 + .

2. The flotation method of lithium ore according to claim 1, wherein In Formula 1, R1 is a saturated alkyl group of C 10 ~C 20 or a carbon chain with 1 to 2 unsaturated double bonds; Preferably, X is methylene or ethylene; Preferably, R2 is H, or a substituted alkyl group with an acylamino or amino substituent.

3. The flotation method of lithium ore according to claim 1, wherein The collector of Formula 1 includes at least one of Formula 1A and Formula 1B; The R1 is a saturated or partially unsaturated carbon chain of C 10 ~C 20 ; the X is methylene or ethylene; Y is a saturated carbon chain with 1 to 5 carbon atoms; R3 is an acylamino or amino group.

4. The flotation method of lithium ore according to claim 3, wherein The collector of Formula 1 includes a composite collector of Formula 1A and Formula 1B with a molar ratio of 1 to 5:

1.

5. The flotation method of lithium ore according to claim 1, characterized in that, Formula 1 is obtained by a condensation reaction of Formula 2 and Formula 3; 6. The flotation method of lithium ore according to claim 1, characterized in that, In the flotation reagent, a flotation aid is further included, and the flotation aid includes at least one of a foaming agent, a pH regulator, and an inhibitor.

7. The flotation method of lithium ore according to claim 1, characterized in that, The lithium ore is at least one of spodumene, lepidolite, petalite, amblygonite, pennantite, and nepheline; preferably spodumene; Preferably, the lithium ore is a mineral in which lithium ore and feldspar are disseminated and symbiotic; Preferably, in the lithium ore, the Li2O grade is 1.0% to 1.5%.

8. The flotation method of lithium ore according to claim 1, wherein, The dosage of the collector of Formula 1 is 50 to 3000 g / t.

9. The flotation method of lithium ore according to claim 1, characterized in that, The pH of the pulp in the flotation process is 5 to 10.

10. The flotation method of lithium ore according to claim 1, wherein, The temperature of the flotation process is 5 to 50 °C.

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