Lipidolite whole-fraction flotation collecting agent and preparation method thereof

Abstract

The invention discloses a lepidolite whole-fraction flotation collecting agent and a preparation method thereof, and belongs to the technical field of mineral processing. The flotation collecting agent provided by the invention comprises the following raw materials in parts by weight: 10-40 parts of modified fatty amine, 10-40 parts of modified fatty acid, 5-30 parts of organic alkali and 5-30 parts of a regulator. The preparation method comprises the following steps: S1, putting the modified fatty amine and the modified fatty acid into a reactor, heating to 20-70 DEG C, and stirring for 1-4 hours to obtain a mixture; and S2, organic alkali and an adjusting agent are added into the mixture, the mixture is heated to 50-70 DEG C, stirring is conducted for 1-4 h, and the lepidolite whole-size-fraction flotation collecting agent is prepared. The prepared flotation collecting agent has the advantages of being resistant to mud, high in selectivity and capable of adapting to the characteristics of lepidolite with different particle sizes, the flotation process is simplified, and the overall recovery rate of the lepidolite is increased.

Description

Technical Field

[0001] The present application belongs to the field of mineral processing technology, and specifically relates to a lepidolite full-size flotation collector and a preparation method thereof. Background Art

[0002] Lithium, as a strategic resource, is crucial to the development of China's economy and science and technology. Lepidolite (also known as "lepidolite"), often containing rare metal elements such as rubidium and cesium, is primarily found in pegmatites, but also in greisen and high-temperature hydrothermal veins. It is one of the primary raw materials for lithium extraction from solid minerals in my country.

[0003] However, my country's lithium resources are relatively poor, and lepidolite is often associated with gangue minerals such as quartz and feldspar. Since lepidolite, quartz, feldspar, and other minerals are silicate minerals with similar surface properties, the grinding process easily leads to ore mudification, making flotation separation more difficult and limiting the recovery of lepidolite minerals. In order to improve the recovery rate of lepidolite, industrial production often requires the addition of a desludging step, which not only increases the complexity of the process, but also makes it difficult to effectively recover the lepidolite in the fine mud, resulting in a low overall lepidolite recovery rate.

[0004] Faced with this situation, domestic and international scholars have conducted extensive research, developing a series of collectors, ranging from single cationic collectors in acidic systems to anionic and cationic combinations and cation-cation combinations in neutral and weakly alkaline systems. These improvements have achieved certain results. However, due to the differences in surface properties between large-scale lepidolite and fine-grained mica, the overall recovery rate of lepidolite remains low.

[0005] Therefore, there is an urgent need to develop a mud-resistant, highly selective, full-size flotation collector for lepidolite, which is of great significance for simplifying the flotation process and improving the resource utilization of lepidolite. Summary of the Invention

[0006] In view of this, the present application provides a full-size flotation collector for lepidolite and a preparation method thereof. The flotation collector has mud resistance and high selectivity, can adapt to the characteristics of lepidolite of different particle sizes, simplify the flotation process, and improve the overall recovery rate of lepidolite.

[0007] In the first aspect, the present application provides a lepidolite full-size flotation collector, the raw material composition of which includes, by weight: 10 to 40 parts of modified fatty amine, 10 to 40 parts of modified fatty acid, 5 to 30 parts of organic base, and 5 to 30 parts of regulator.

[0008] By adopting the above technical solution, the present invention's full-size flotation collector for lepidolite is prepared using modified fatty acids and modified fatty amines as the main raw materials, with the addition of organic bases and adjusting agents. It has strong selectivity, good mud resistance, and adaptability to a wide range of particle sizes. It has strong flocculation and collection capabilities and selectivity for both large-scale and fine-grained mica. The positively charged amino groups in the modified fatty amines, after dissociation in water, can be adsorbed on the surface of lepidolite through electrostatic adsorption; the RCOO formed by the modified fatty acid - Ions form complexes with metal ions on the surface of lepidolite, enhancing the selective adsorption of lepidolite. This composite collection system not only improves the adsorption strength and selectivity of the collector on the mineral surface, but also reduces its ineffective adsorption in fine mud, improving the collector's mud resistance.

[0009] Furthermore, the addition of an organic base to the present invention can adjust the pH of the slurry to an appropriate range, ensuring that the collector molecules are in an optimally active state while also improving the collector's solubility and adsorption properties. The modifier can improve the collector's dispersibility and increase its adsorption efficiency on the mineral surface.

[0010] The above components work together to produce a collector that can effectively identify and capture lepidolite even in the presence of a large amount of fine mud. Therefore, the collector of the present application is suitable for a system for separating lepidolite from the surface of minerals adsorbed by fine mud, and can be directly used in the flotation operation of lepidolite without pre-desliming treatment, thereby simplifying the process flow. In addition, the collector has good adaptability to lepidolite of different particle sizes, thereby ensuring the efficient recovery of lepidolite within a wide particle size range and improving the overall recovery rate of lepidolite.

[0011] Optionally, the raw material composition includes, by weight: 20 to 35 parts of modified fatty amine, 20 to 35 parts of modified fatty acid, 10 to 25 parts of organic base, and 10 to 20 parts of adjusting agent.

[0012] By adopting the above technical solution, when the composition of the collector meets the above range, the mud resistance and selectivity of the collector can be further improved, and the overall recovery rate of lepidolite can be increased.

[0013] Optionally, the fatty amine precursor of the modified fatty amine includes at least one of laurylamine, coconut amine, and stearylamine.

[0014] By adopting the above technical solution, the fatty amine precursor of the modified fatty amine of the present application has strong adaptability and can obtain good solubility and dispersibility after modification, thereby further improving the overall recovery rate of lepidolite.

[0015] Optionally, the fatty acid precursor of the modified fatty acid includes at least one of oleic acid, linoleic acid, linolenic acid, and mesic acid.

[0016] By adopting the above technical solution, the fatty acid precursors of the modified fatty acids in this application have high reactivity, which is beneficial for selective adsorption of lepidolite. Furthermore, it can adapt to mineral particles of different particle sizes. For fine-grained lepidolite, these fatty acids, due to their strong dispersibility and complexing abilities, can help aggregate tiny particles and promote their buoyancy. At the same time, they can also provide sufficient adsorption capacity for larger-sized lepidolite, ensuring efficient recovery rates.

[0017] Optionally, the organic base includes one or two of ethylenediamine, monoethanolamine or triethanolamine.

[0018] By adopting the above technical solution, the organic base selected in this application has good buffering capacity, which helps adjust the pH value of the slurry to the optimal range for collector activity. The appropriate amount of organic base can also improve the solubility and dispersibility of the collector, thereby increasing the collection efficiency. It can also inhibit the activity of metal ions on the surface of non-target silicate minerals such as quartz and feldspar, reducing their competitive adsorption, and further improving the collector's selectivity for lepidolite.

[0019] Optionally, the regulator includes at least one of methanol, ethanol, octanol, kerosene, diesel or pine oil.

[0020] By adopting the above technical solution, the regulator of the present application helps to improve the solubility and dispersibility of the collector, and can also reduce the adsorption interference of fine mud on the collector, thereby improving the mud resistance of the collector.

[0021] In a second aspect, the present application provides a method for preparing the above-mentioned lepidolite full-size flotation collector, comprising the following steps:

[0022] Step S1, placing the modified fatty amine and the modified fatty acid in a reactor, heating to 20° C. to 70° C., and stirring for 1 h to 4 h to obtain a mixture;

[0023] Step S2: adding the organic base and the adjusting agent to the mixture, heating to 50° C. to 70° C., and stirring for 1 h to 4 h to prepare a lepidolite full-size flotation collector.

[0024] By adopting the above-mentioned technical solution, the preparation method of the present application is simple, efficient, and easy to industrialize. The preparation of a full-size flotation collector for lithium mica can be achieved by controlling various conditions. Step S1 uses a specific temperature and sufficient stirring to allow the two main components to fully contact and establish a stable mutual solubility state, laying the foundation for subsequent reactions and enhancing the coverage ability of the collector on the mineral surface. Step S2 adds an organic base and an adjusting agent. The organic base is used to adjust the pH value of the slurry, enhance the dissociation degree of fatty acids, and improve their complexing ability; at the same time, it inhibits the activation of non-target minerals and enhances selectivity. The adjusting agent further optimizes the wettability and dispersibility of the collector, reduces interfacial tension, and promotes the effective adsorption of the collector on the mineral surface.

[0025] Optionally, in step S1, the preparation step of the modified fatty amine is: mixing a fatty amine precursor and ethylene oxide in a mass ratio of 1 to 3:1, placing the mixture in a reactor, heating the mixture to 100° C. to 150° C., and reacting the mixture for 10 to 20 hours to obtain the modified fatty amine.

[0026] By adopting the above technical solution, the modification method of the fatty amine in this application increases its water solubility, making it more evenly dispersed in the slurry, which is beneficial for improving flotation efficiency. It also enhances the stability of the mixing process with anionic fatty acids, helps to build a more stable anion-cation composite system, enhances the adsorption capacity and selectivity of the collector on the mineral surface, and further improves the capture efficiency.

[0027] Optionally, in step S1, the preparation step of the modified fatty acid is: mixing a fatty acid precursor and concentrated sulfuric acid in a mass ratio of 10:1 to 4, placing the mixture in a reactor, reacting the mixture at 20°C to 50°C for 5 hours, and washing the mixture with saturated brine to obtain the modified fatty acid.

[0028] By adopting the above technical solution, the fatty acid modification method of the present application sulfonates the fatty acid, adds a sulfonate functional group, thereby improving its water solubility, enhancing its hard water resistance and low temperature resistance, and the modified fatty acid can still maintain good solubility and fluidity at lower temperatures, expanding its application range. The modified fatty acid is not only suitable for large-particle lepidolite (through electrostatic attraction), but also can show excellent selectivity and capture ability for fine-particle lepidolite through complexation and the help of a regulator, achieving full-particle flotation of lepidolite.

[0029] Optionally, the mass of the saturated brine is twice the total mass of the fatty acid precursor and the concentrated sulfuric acid.

[0030] By adopting the above technical solution, the washing process can be ensured to be efficient and thorough, the process flow can be simplified, and the production cost can be reduced.

[0031] In summary, the present invention includes at least one of the following beneficial technical effects:

[0032] 1. The lepidolite full-size flotation collector of the present application is prepared by using modified fatty acids and modified fatty amines as main raw materials, and adding organic bases and adjusting agents. It has strong selectivity, good mud resistance, and is adaptable to a wide range of particle sizes.

[0033] 2. The collector of the present application can effectively identify and capture lepidolite even in the presence of a large amount of fine mud, thereby simplifying the process flow; and it has good adaptability to lepidolite of different particle sizes, thereby improving the overall recovery rate of lepidolite.

[0034] 3. The preparation method of the present application is simple, efficient, and easy to industrialize. By controlling various conditions, the preparation of a flotation collector for lepidolite of all particle sizes can be achieved. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0036] The inventors of the present application found in their research on flotation collectors that the flotation collectors in the prior art have poor selectivity and cannot support the flotation of wide-size lepidolite, resulting in a low overall recovery rate of lepidolite.

[0037] In order to solve the above problems, the present application provides a flotation collector for lepidolite of all particle sizes in a first aspect, the raw material composition of which includes, by weight, 10 to 40 parts of modified fatty amine, 10 to 40 parts of modified fatty acid, 5 to 30 parts of organic base, and 5 to 30 parts of adjusting agent. The inventors found that the anion-cation composite system of modified fatty amine and modified fatty acid reduces the problem of single cationic agent being adsorbed by fine mud, the organic base regulates the pH value, and the adjusting agent reduces the adsorption interference of fine mud on the collector, thereby enhancing the overall mud resistance. The combined action of the modified fatty amine and modified fatty acid of the present application ensures good adaptability to lepidolite in a wide particle size range, and realizes the effective recovery of lepidolite of all particle sizes. The collector provided by the present invention not only simplifies the traditional flotation process, without the need for a pre-desliming process, but also can significantly improve the overall recovery rate of lepidolite by direct flotation, and is suitable for various types of lepidolite ores, which is conducive to the efficient development and utilization of lithium resources.

[0038] In some embodiments, a lepidolite full-size flotation collector comprises, by weight, 20-35 parts of a modified fatty amine, 20-35 parts of a modified fatty acid, 10-25 parts of an organic base, and 10-20 parts of a conditioning agent. The present application regulates the raw material composition of the collector to meet the aforementioned range, further improving the collector's mud resistance and selectivity, adapting it to lepidolites of varying particle sizes, and increasing the overall recovery rate of the lepidolite.

[0039] In some embodiments, the fatty amine precursor of the modified fatty amine includes at least one of laurylamine, coconut amine, and octadecylamine. The selection of the fatty amine precursor of the present application further improves the overall recovery rate of lepidolite.

[0040] In some embodiments, the fatty acid precursor of the modified fatty acid includes at least one of oleic acid, linoleic acid, linolenic acid, and mesic acid. The selection of the fatty acid precursor of the present application further improves the mud resistance selectivity of the collector, adapts to lepidolite of different particle sizes, and improves the overall recovery rate of lepidolite.

[0041] In some embodiments, the organic base comprises one or both of ethylenediamine, monoethanolamine, or triethanolamine. The selection of the organic base in the present application further improves the selectivity of the collector and the overall recovery rate of the lepidolite.

[0042] In some embodiments, the conditioning agent comprises at least one of methanol, ethanol, octanol, kerosene, diesel, or pine oil. The selection of the conditioning agent in the present application further improves the mud resistance of the collector.

[0043] In a second aspect, the present application provides a method for preparing a full-size flotation collector for lepidolite, comprising the following steps: Step S1: placing a modified fatty amine and a modified fatty acid in a reactor, heating to 20°C to 70°C, and stirring for 1 to 4 hours to produce a mixture; Step S2: adding an organic base and a regulator to the mixture, heating to 50°C to 70°C, and stirring for 1 to 4 hours to produce a full-size flotation collector for lepidolite. The preparation method provided herein is advantageous in improving the collector's mud resistance and selectivity, adapting it to lepidolite of different particle sizes, and increasing the overall recovery rate of lepidolite.

[0044] In some embodiments, in step S1, the modified fatty amine is prepared by mixing a fatty amine precursor and ethylene oxide in a mass ratio of 1 to 3:1, placing the mixture in a reactor, heating the mixture to 100°C to 150°C, and reacting the mixture for 10 to 20 hours to obtain the modified fatty amine. The modified fatty amine preparation method of the present application further improves the selectivity and collection efficiency of the collector.

[0045] In some embodiments, in step S1, the modified fatty acid is prepared by mixing a fatty acid precursor and concentrated sulfuric acid in a mass ratio of 10:1 to 4, placing the mixture in a reactor, reacting the mixture at 20°C to 50°C for 5 hours, and washing the mixture with saturated brine to produce the modified fatty acid. The modified fatty acid preparation method of the present application further improves the selectivity of the collector and is adaptable to lepidolites of varying particle sizes.

[0046] In some embodiments, the mass of the saturated saline solution is twice the total mass of the fatty acid precursor and the concentrated sulfuric acid.

[0047] The scheme of the present application is described below with reference to the following specific examples. Unless otherwise specified, the raw materials used in the following examples are all from common commercial products, and the devices or equipment used are all purchased from conventional market sales channels. Specific embodiments

[0049] Example 1

[0050] This embodiment provides a lepidolite full-size flotation collector, the raw material composition of which comprises, by weight, 40 parts of modified fatty amine, 20 parts of modified fatty acid, 20 parts of organic base, and 20 parts of adjusting agent.

[0051] The preparation method comprises the following steps:

[0052] Step S1, placing a modified fatty amine and a modified fatty acid in a reactor, heating to 25° C., and stirring for 2 hours to obtain a mixture;

[0053] Step S2: adding an organic base and a regulator to the mixture, heating to 70° C., and stirring for 4 hours to prepare a lepidolite full-size flotation collector; wherein the organic base is triethanolamine; and the regulator is methanol and pine oil in a mass ratio of 1:1.

[0054] The preparation steps of the modified fatty amine are as follows: a fatty amine precursor and ethylene oxide are mixed in a mass ratio of 3:1, placed in a reactor, heated to 150°C, and reacted for 10 hours to obtain the modified fatty amine; the fatty amine precursor is dodecylamine;

[0055] The preparation steps of the modified fatty acid are as follows: a fatty acid precursor and concentrated sulfuric acid are mixed in a mass ratio of 10:4, placed in a reactor, reacted at 40°C for 5 hours, washed with saturated salt water, the mass of the saturated salt water being twice the total mass of the fatty acid precursor and concentrated sulfuric acid, to obtain a modified fatty acid; the fatty acid precursor is cottonseed oil fatty acid.

[0056] Example 2

[0057] This embodiment provides a lepidolite full-size flotation collector, the raw material composition of which comprises, by weight, 35 parts of modified fatty amine, 20 parts of modified fatty acid, 15 parts of organic base, and 30 parts of adjusting agent.

[0058] The preparation method comprises the following steps:

[0059] Step S1, placing a modified fatty amine and a modified fatty acid in a reactor, heating to 25° C., and stirring for 2 hours to obtain a mixture;

[0060] Step S2: adding an organic base and a regulator to the mixture, heating to 70° C., and stirring for 4 hours to prepare a lepidolite full-size flotation collector; wherein the organic base is monoethanolamine; and the regulator is octanol and kerosene in a mass ratio of 2:1.

[0061] The preparation steps of the modified fatty amine are as follows: a fatty amine precursor and ethylene oxide are mixed in a mass ratio of 1.5:1, placed in a reactor, heated to 100°C, and reacted for 20 hours to obtain the modified fatty amine; the fatty amine precursor is coconut amine;

[0062] The preparation steps of the modified fatty acid are as follows: a fatty acid precursor and concentrated sulfuric acid are mixed in a mass ratio of 10:1, placed in a reactor, reacted at 40°C for 5 hours, washed with saturated brine, the mass of the saturated brine being twice the total mass of the fatty acid precursor and concentrated sulfuric acid, to obtain a modified fatty acid; the fatty acid precursor is cottonseed oil fatty acid.

[0063] Comparative Example 1

[0064] Comparative Example 1 uses a commercially available agent as a collector.

[0065] Experimental testing

[0066] Test items

[0067] Concentrate yield: the percentage of flotation concentrate weight to flotation ore weight;

[0068] Li2O grade of concentrate: the percentage of Li2O weight in lepidolite concentrate to the weight of concentrate;

[0069] Li2O recovery rate of concentrate: the percentage of Li2O mass in lepidolite concentrate to the mass of Li2O in flotation ore, calculated as ε = γ × β / α × 100%, where: ε is the Li2O recovery rate (%); γ is the concentrate yield (%); β is the Li2O grade of the concentrate (%); α is the Li2O grade of the ore (%).

[0070] The collectors prepared in Examples 1 to 2 and Comparative Example 1 were prepared into a 5% reagent solution for standby use. The ore was a certain lepidolite ore with a fineness of -100 mesh and a content of 55.21%.

[0071] The flotation experiments of Examples 1 and 2 were conducted under the following conditions: the dosage of the reagent was 800 g / t, the dosage of the sodium carbonate was 1000 g / t, and the dosage of the dispersant was 600 g / t;

[0072] Flotation experiment of Comparative Example 1: The flotation experiment was carried out under the conditions of 1000 g / t of reagent dosage, 1000 g / t of sodium carbonate dosage, and 800 g / t of dispersant dosage. The flotation results of Examples 1-2 and Comparative Example 1 are shown in Table 1.

[0073] Table 1

[0074]

[0075] From the test results in Table 1, it can be seen that the collectors prepared in Examples 1 and 2 have a high recovery rate of Li2O in the concentrate in the flotation experiment, which shows that the collector prepared in this application has good selectivity and high collection efficiency.

[0076] Comparative Example 1 uses commercially available reagents, and more reagents are used in the flotation experiment, but the final concentrate Li2O recovery rate is significantly lower than that of the present application, and the collection efficiency of the reagents is low.

[0077] Comparative Example 2

[0078] The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, the fatty acid and the fatty amine are not modified, and the specific preparation method of the collector is:

[0079] Step S1, placing 40 parts of dodecylamine and 20 parts of cottonseed oil fatty acid in a reactor, heating to 25° C., and stirring for 2 hours to prepare a mixture;

[0080] Step S2: adding 20 parts of an organic base and 20 parts of a regulator to the mixture, heating to 70° C., and stirring for 4 hours to prepare a collector; wherein the organic base is triethanolamine; and the regulator is methanol and pine oil in a mass ratio of 1:1.

[0081] Comparative Example 3

[0082] The difference between Comparative Example 3 and Example 1 is that in Comparative Example 3, no modified fatty acid is added, and the specific preparation method of the collector is:

[0083] Step S1, mixing a fatty amine precursor and ethylene oxide in a mass ratio of 3:1, placing the mixture in a reactor, heating to 150° C., and reacting for 10 hours to obtain a modified fatty amine; the fatty amine precursor is dodecylamine;

[0084] Step S2: adding 20 parts of an organic base and 20 parts of a regulator to 40 parts of a modified fatty amine, heating to 70° C., and stirring for 4 hours to prepare a collector; wherein the organic base is triethanolamine; and the regulator is methanol and pine oil in a mass ratio of 1:1.

[0085] Examples 3 to 5

[0086] Example 3

[0087] This embodiment provides a lepidolite full-size flotation collector, the raw material composition of which includes, by weight, 40 parts of modified fatty amine, 10 parts of modified fatty acid, 30 parts of organic base, and 20 parts of adjusting agent.

[0088] The preparation method comprises the following steps:

[0089] Step S1, placing a modified fatty amine and a modified fatty acid in a reactor, heating to 70° C., and stirring for 1 hour to obtain a mixture;

[0090] Step S2: adding an organic base and a regulator to the mixture, heating to 50° C., and stirring for 2 hours to prepare a lepidolite full-size flotation collector; wherein the organic base is ethylenediamine; and the regulator is ethanol and diesel in a mass ratio of 1:1.

[0091] The preparation steps of the modified fatty amine are as follows: a fatty amine precursor and ethylene oxide are mixed in a mass ratio of 1:1, placed in a reactor, heated to 125°C, and reacted for 15 hours to obtain the modified fatty amine; the fatty amine precursor is octadecylamine;

[0092] The preparation steps of modified fatty acids are as follows: fatty acid precursors and concentrated sulfuric acid are mixed in a mass ratio of 10:2, placed in a reactor, reacted at 20°C for 5 hours, and washed with saturated salt water, the mass of which is twice the total mass of the fatty acid precursors and concentrated sulfuric acid, to obtain modified fatty acids; the fatty acid precursors are oleic acid, linolenic acid and mesic acid in a mass ratio of 1:1:1.

[0093] Example 4

[0094] The difference between Example 4 and Example 1 is that in the preparation step of the modified fatty acid in Example 4, the fatty acid precursor and concentrated sulfuric acid are mixed in a mass ratio of 10:3.

[0095] Example 5

[0096] The difference between Example 5 and Example 1 is that in the preparation step of the modified fatty acid in Example 5, the fatty acid precursor and concentrated sulfuric acid are mixed in a mass ratio of 10:1.

[0097] The collectors prepared in Comparative Examples 2 to 3 and Examples 3 to 5 were prepared into a 5% reagent solution for standby use. The ore was a certain lepidolite ore with a fineness of -100 mesh and a content of 55.21%.

[0098] Flotation experiment: Flotation experiments were carried out under the conditions of reagent dosage of 800 g / t, sodium carbonate dosage of 1000 g / t, and dispersant dosage of 600 g / t; the Li2O recovery rates of the concentrates in the flotation results of Comparative Examples 2-3 and Examples 3-5 are shown in Table 2.

[0099] Table 2

[0100]

[0101]

[0102] From the test results in Table 2, it can be seen that in Comparative Example 2, the fatty acid and fatty amine were not modified, and the recovery rate of Li2O in the concentrate was significantly reduced; in Comparative Example 3, no modified fatty acid was added, the recovery rate was low, and the collection capacity was greatly reduced.

[0103] The collector prepared in Example 3 was subjected to flotation experiments, and the collector had good collecting ability.

[0104] The difference between Example 4, Example 5 and Example 1 is that the mass ratio of the fatty acid precursor and concentrated sulfuric acid in the modified fatty acid is different. Among them, the collector prepared in Example 4 has the highest Li2O recovery rate and the highest collection efficiency in the flotation experiment.

[0105] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the principles of the present application should be included in the scope of protection of the present application.

Claims

1. A lepidolite full-size flotation collector, characterized in that: The raw material composition includes, by weight, 10 to 40 parts of modified fatty amine, 10 to 40 parts of modified fatty acid, 5 to 30 parts of organic base, and 5 to 30 parts of adjusting agent.

2. The lepidolite full-size flotation collector according to claim 1, wherein The raw material composition includes, by weight, 20 to 35 parts of modified fatty amine, 20 to 35 parts of modified fatty acid, 10 to 25 parts of organic base, and 10 to 20 parts of adjusting agent.

3. The lepidolite full-size flotation collector according to claim 1, wherein The fatty amine precursor of the modified fatty amine includes at least one of laurylamine, coconut amine and octadecylamine.

4. The lepidolite full-size flotation collector according to claim 1, wherein The fatty acid precursor of the modified fatty acid includes at least one of oleic acid, linoleic acid, linolenic acid and mesoic acid.

5. The lepidolite full-size flotation collector according to claim 1, wherein The organic base includes one or two of ethylenediamine, monoethanolamine or triethanolamine.

6. The lepidolite full-size flotation collector according to claim 1, wherein The regulator includes at least one of methanol, ethanol, octanol, kerosene, diesel or pine oil.

7. The method for preparing the lepidolite full-size flotation collector according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1, placing the modified fatty amine and the modified fatty acid in a reactor, heating to 20° C. to 70° C., and stirring for 1 h to 4 h to obtain a mixture; Step S2: adding the organic base and the adjusting agent to the mixture, heating to 50° C. to 70° C., and stirring for 1 h to 4 h to prepare a lepidolite full-size flotation collector.

8. The preparation method according to claim 7, characterized in that In step S1, the modified fatty amine is prepared by mixing a fatty amine precursor and ethylene oxide in a mass ratio of 1 to 3:1, placing the mixture in a reactor, heating the mixture to 100° C. to 150° C., and reacting the mixture for 10 to 20 hours to obtain the modified fatty amine.

9. The preparation method according to claim 7, characterized in that In step S1, the modified fatty acid is prepared by mixing a fatty acid precursor and concentrated sulfuric acid in a mass ratio of 10:1 to 4, placing the mixture in a reactor, reacting the mixture at 20°C to 50°C for 5 hours, and washing the mixture with saturated brine to obtain the modified fatty acid.

10. The preparation method according to claim 9, characterized in that The mass of the saturated salt water is twice the total mass of the fatty acid precursor and the concentrated sulfuric acid.

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