Reagents for synchronous recovery of rare earth and fluorite from fluorite-type rare earth ores and their use methods

Abstract

The present invention discloses a reagent for synchronous recovery of rare earth and fluorite from fluorite-type rare earth ores, comprising a collector CRF and an inhibitor DRF; wherein, the collector CRF is a combined reagent comprising fatty acid, alkyl aminopropionate monoester and sulfobetaine; the inhibitor DRF is a combined reagent comprising aromatic sulfonate condensate, water glass, lignosulfonate and tannin extract. The synchronous recovery reagent provided by the present invention is green and non-toxic, realizes the synchronous flotation recovery of rare earth and fluorite in fluorite-type rare earth ores, simultaneously makes up for the defect that the direct magnetic separation of rare earth and fluorite mixed concentrate has unsatisfactory effect, improves the comprehensive utilization efficiency of fluorite-type rare earth ores, and also provides a new method for the purification of rare earth and fluorite mixed concentrate.

Description

Technical Field

[0001] The present invention relates to the field of mineral flotation, and particularly to a reagent and method for synchronous green recovery of rare earth and fluorite from fluorite-type rare earth ores. Background Art

[0002] Rare earths, as a key strategic mineral resource of a country, are crucial for social and economic development and play a key role in the fields of national defense security and new energy technologies. Fluorite (CaF2) is the main source of fluorine resources at present. Fluorine (F) is an indispensable chemical substance and is widely used in new energy, new materials, optoelectronics, metallurgy and other fields, and is called the second rare earth.

[0003] Fluorite-type rare earth ores contain both rare earth and fluorite useful minerals. Fluorite-type rare earth ores are mostly carbonatite-type rare earth ores associated with fluorite minerals. Fluorite-type rare earth ores in China are mainly distributed in Inner Mongolia and Sichuan regions. The associated fluorite reserves in fluorite-type rare earth ores are relatively large, which are potential resources to ensure the supply security of fluorite resources in China in the future. Therefore, the comprehensive recovery and utilization of rare earth and fluorite in fluorite-type rare earth ores is of great significance.

[0004] The comprehensive utilization of beneficiation technology for fluorite-type rare earth ores is difficult. The color of fluorite in fluorite-type rare earth ores is generally darker, usually purple or even turning to purple-black. Systematic research has found that the oleate adsorption amount of colorless fluorite is lower and the surface roughness is smaller, and its floatability is better than that of green and purple fluorite. The oleate adsorption amount of purple fluorite is high and the surface roughness is large, and its recovery rate is lower than that of white and purple fluorite. Usually, the fluorite in fluorite-type rare earth ores is mostly purple fluorite with poor floatability, and this iron-stained purple fluorite has certain weak magnetism, making it difficult to effectively separate it from weakly magnetic rare earth minerals by using a strong magnetic separation process.

[0005] The CaF2 grade in fluorite-type rare earth ores in China is usually less than 20%, and it is associated with gangue minerals such as calcite and barite. Since fluorite and calcite have similar surface properties, both are calcium-containing minerals, and the calcium ions on their surfaces can strongly interact with common collectors without difference. At the same time, the salt minerals of fluorite and calcite dissolve or surface-transform each other, making the surface properties of fluorite and calcite approach, and the floatability difference is further reduced, resulting in similar floatability and difficult flotation separation.

[0006] At present, in order to achieve the purpose of comprehensive recovery and utilization of rare earth and fluorite in fluorite-type rare earth ores, the main beneficiation process flow is basically to preferentially float rare earth minerals step by step in sequence, and then comprehensively recover fluorite from the tailings of rare earth flotation.

[0007] The rare earth flotation collectors in the flotation reagents involved in this process are basically various mature hydroxamic acids. At the same time, a large amount of water glass is used to inhibit fluorite and other gangue minerals. The focus of flotation reagent research mainly concentrates on recovering fluorite from rare earth ore dressing tailings, mainly the combined use of reagents.

[0008] For example, mixing a collector with strong collecting ability for fluorite but poor selectivity and a collector with slightly weaker collecting ability but good selectivity or other surfactants can usually effectively improve the flotation index of fluorite. Such as the mixed collector of sodium naphthenate and fatty acid, the mixed collector of oleic acid, phosphate ester and ethylenediamine, the mixed collector of oxidized paraffin soap and alkyl trimethyl diamine, the mixed collector of oleic acid and sodium dodecyl sarcosinate, etc. The inhibition of gangue minerals usually adopts a mixed inhibitor to inhibit gangue minerals rather than using a single inhibitor. Reasonably selecting the corresponding type of inhibitor combination according to the types of gangue minerals in the fluorite ore can significantly improve the index of flotation fluorite concentrate. Such as sodium humate + water glass + tannin extract, acidified water glass + tannin extract + ferrous sulfate, water glass + aluminum sulfate. Compared with single water glass, the mixture inhibitor of water glass and other organic or inorganic inhibitors can significantly improve the grade and recovery rate of flotation fluorite concentrate.

[0009] At present, for the purpose of realizing the comprehensive recovery and utilization of rare earth and fluorite resources, the beneficiation of fluorite-type rare earth ore usually uses hydroxamic acids as collectors for rare earth minerals, and a large amount of water glass-based inhibitors are used to forcibly inhibit the floating of other calcium, barium and other gangue minerals including fluorite. At the same time, a foaming agent is added to make up for the problem that some aromatic hydroxamic acid collectors have weak foaming ability, and rare earth minerals are preferentially flotation recovered. This process technology has the following defects: ① Using hydroxamic acids as collectors for rare earth minerals and cooperating with a large amount of inhibitors to inhibit gangue minerals, resulting in over-inhibition of fluorite minerals, which is not conducive to the subsequent flotation recovery of fluorite from rare earth ore dressing tailings. ② Due to the strong chelating effect of hydroxamic acids on iron ions, hydroxamic acids have a strong effect on iron-stained calcium and barium minerals such as calcite and barite. In the rare earth flotation stage, a large amount of hydroxamic acid collectors are firmly adsorbed by the fine mud of iron-stained calcium and barium salt gangue minerals in the pulp. In the fluorite flotation stage of rare earth flotation tailings, it is difficult to re-inhibit this part of iron-stained calcium and barium gangue minerals adsorbed with hydroxamic acids, increasing the difficulty of flotation recovery of fluorite from rare earth flotation tailings. ③ Most rare earth hydroxamic acid collectors are aromatic ring-containing hydroxamic acids, with relatively high reagent costs, and hydroxamic acids have certain toxicity. Therefore, there is an urgent need for a green reagent for the comprehensive recovery of rare earth and fluorite in fluorite-type rare earth ore. Summary of the Invention

[0010] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a synchronous green recovery reagent for rare earth and fluorite in fluorite-type rare earth ore and its use method, so as to at least achieve

[0011] The purpose of the present invention is achieved through the following technical solutions:

[0012] A reagent for synchronous recovery of rare earth and fluorite from fluorite-type rare earth ore:

[0013] The fluorite-type rare earth ore contains rare earth and fluorite as useful minerals, and also contains calcite, barium sulfate and other gangue minerals.

[0014] The recovery reagent includes a collector CRF and an inhibitor DRF;

[0015] The collector CRF is a combined reagent including fatty acid, alkyl aminopropionate monoester and sulfobetaine;

[0016] The inhibitor DRF is a combined reagent including aromatic sulfonate condensate, water glass, lignosulfonate and tannin extract.

[0017] Furthermore, the fatty acid in the collector CRF includes at least one of oleic acid, oxidized paraffin soap, tall oil and naphthenic acid;

[0018] Preferably, the fatty acid is sodium oleate.

[0019] Furthermore, the alkyl aminopropionate monoester in the collector CRF is N-alkyl aminopropionate monoester, with the molecular formula of RNHCH2CH2COOH, where R is selected from hydrocarbon groups of C 10 ~C 18 ;

[0020] The hydroxyl group is substituted by one or more hydrogen atoms, alkyl groups, halogens, methoxy groups, aryl groups and heteroaryl groups that are each independent;

[0021] Preferably, the alkyl aminopropionate monoester is N-tetradecyl aminopropionate monoester of C 14 .

[0022] Furthermore, the molecular formula of the sulfobetaine in the collector CRF is CH3(CH2) n N + (CH3)2(CH2) m SO3 - or CH3(CH2CH2O) n N + (CH3)2(CH2) m SO3 - , where n = 7 - 17 and m ≥ 2;

[0023] Preferably, the betaine is octadecyl hydroxy sulfobetaine.

[0024] Furthermore, the aromatic sulfonate condensate in the inhibitor DRF includes compounds of formula (I) - formula (IV);

[0025]

[0026] Preferably, the aromatic sulfonate condensate is a naphthalene sulfonic acid polymer of formula (I); most preferably, the aromatic sulfonate condensate is sodium 2-naphthalene sulfonate formaldehyde polymer.

[0027] Furthermore, the sodium silicate is industrial sodium silicate.

[0028] Furthermore, the lignosulfonate is sodium lignosulfonate.

[0029] Furthermore, the tannin extract includes at least one of larch tannin extract, myrica rubra tannin extract and oak cup tannin extract.

[0030] Furthermore, in the collector CRF, the weight ratio of the fatty acid, alkyl aminopropionate monoester and sulfobetaine is 5-8:1-3:1-3; preferably, the weight ratio is 6:2:2.

[0031] Furthermore, the weight ratio of the aromatic sulfonate condensate, sodium silicate, lignosulfonate and tannin extract is 30-50:20-40:10-30:5-15; preferably, the weight ratio is 40:30:20:10.

[0032] Furthermore, the reagent for synchronous recovery of rare earth and fluorite in fluorite-type rare earth ore is used for the flotation separation of fluorite-type rare earth ore.

[0033] Furthermore, the specific method of the flotation separation includes:

[0034] S1: Grinding the raw ore into pulp, adjusting the pH value to 8-9, adding the inhibitor DRF and stirring for pulp conditioning, then adding the collector CRF and stirring for pulp conditioning, and after pulp conditioning, aerating for synchronous flotation of rare earth and fluorite, and beneficiating the foam product obtained by flotation to obtain a mixed concentrate of rare earth and fluorite;

[0035] Among them, the pH value is adjusted by an alkaline pH adjuster, including sodium hydroxide;

[0036] S2: Adjusting the pH value of the mixed concentrate to 4-5 with acid, adding acidified sodium silicate and sodium lignosulfonate and stirring for pulp conditioning, then adding the collector CRF and stirring for pulp conditioning, and after aerating flotation, the foam product obtained is a rare earth concentrate, and the bottom product obtained is a fluorite concentrate;

[0037] Among them, the pH value is adjusted by an acidic pH adjuster, including sulfuric acid.

[0038] Furthermore, it is characterized in that:

[0039] Performing strong magnetic separation on the rare earth concentrate to obtain the magnetic product as the final rare earth concentrate;

[0040] The fluorite concentrate is subjected to high-intensity magnetic separation, and the non-magnetic product obtained is the final fluorite concentrate;

[0041] The non-magnetic product obtained after high-intensity magnetic separation of the rare earth concentrate and the magnetic product obtained after high-intensity magnetic separation of the fluorite concentrate are combined and returned to the above-mentioned flotation separation.

[0042] The beneficial effects of the present invention are as follows:

[0043] The combined reagent provided by the present invention is green and non-toxic, realizing the synchronous flotation recovery of rare earth and fluorite in fluorite-type rare earth ores. At the same time, it makes up for the defect that the direct magnetic separation of rare earth and fluorite mixed concentrates has unsatisfactory separation effect, improves the comprehensive utilization efficiency of fluorite-type rare earth ores, and also provides a new method for the purification of rare earth and fluorite mixed concentrates. Description of the Drawings

[0044] Figure 1 It is the process flow diagram of the synchronous recovery flotation process of rare earth and fluorite in Example 1;

[0045] Figure 2 It is the process flow diagram of Comparative Example 3;

[0046] Figure 3 It is the process flow diagram of the ore dressing process in the closed-circuit experiment of Example 2;

[0047] Figure 4 It is the process flow diagram of the closed-circuit experiment of Comparative Example 4. Detailed Embodiments

[0048] The technical solution of the present invention will be further described in detail below with reference to the drawings, but the protection scope of the present invention is not limited to the following.

[0049] Example 1

[0050] A synchronous recovery experiment was carried out on a fluorite-type rare earth ore. A fluorite-type rare earth ore containing rare earth and fluorite in northern China and containing gangue minerals such as calcite, barite and quartz was used as the flotation experiment ore sample, and the chemical analysis composition of the ore sample is shown in Table 1.

[0051] Table 1

[0052]

[0053] Synchronous ore dressing was carried out on this ore sample to recover rare earth and fluorite. The specific process is shown in the appendix Figure 1 .

[0054] Take 500 g of the test sample and add 500 ml of water. Grind it in a ball mill until the fineness of -0.074 mm content accounts for 90%. Then transfer the pulp obtained from grinding to a flotation cell with a volume of 1.5 L. Add butyl xanthate (150 g / t) to the pulp and stir for 3 minutes. Then add No. 2 oil (20 g / t) and stir for 2 minutes. During the flotation process, inflate the pulp with an air volume of 2 L / min, and scrape the foam for 3 minutes. The flotation foam product is discarded as sulfur-containing impurities. Then, successively add aluminum sulfate (400 g / t) to the pulp in the flotation cell and stir for 3 minutes. Then add sodium hydroxide (100 g / t, pulp pH value 8 - 9) and combined inhibitor DRF (200 g / t), and stir for 3 minutes. Then add collector CRF (400 g / t) as the collector, and after stirring for 3 minutes, conduct the first rough selection of synchronous flotation of rare earth and fluorite. During the flotation process, inflate the pulp with an air volume of 2 L / min, and scrape the foam for 3 minutes to obtain the foam product from the first synchronous flotation of rare earth and fluorite. The pulp in the flotation cell is the tailings.

[0055] Transfer the foam product obtained from the first flotation to a 0.5 L flotation cell. Successively add sulfuric acid (500 g / t, maintaining the pH value at about 6 - 7) and combined inhibitor DRF (70 g / t) and stir for 3 minutes. Then add combined collector CRF (150 g / t) and stir for 3 minutes. Conduct the second flotation (cleaning 1) with an air volume of 2 L / min and scrape the foam for 3 min to obtain the second flotation foam product and the bottom product of the cell. The bottom product is used as tailings.

[0056] Then transfer the second flotation foam product to a 0.5 L flotation cell and successively add sulfuric acid (300 g / t, maintaining the pH value at about 6 - 7) and combined inhibitor DRF (50 g / t) and stir for 3 minutes. Conduct the third flotation (cleaning 2) for 3 min with an air volume of 2 L / min to obtain the third flotation foam product and the bottom product of the cell. The bottom product is the middlings of cleaning 2.

[0057] Then transfer the third flotation foam product to a 0.5 L flotation cell and successively add sulfuric acid (200 g / t, maintaining the pH value at about 6 - 7) and combined inhibitor DRF (30 g / t) and stir for 3 minutes. Then add combined collector CF (100 g / t) and stir for 3 minutes. Conduct the fourth flotation (cleaning 3) for 3 min with an air volume of 2 L / min to obtain the fourth flotation foam product and the bottom product of the cell. The bottom product is the middlings of cleaning 3. From the fifth (cleaning 4) to the seventh (cleaning 6), only sulfuric acid and inhibitor DRF are added. The foam product obtained from the seventh cleaning is the mixed concentrate of rare earth and fluorite. Starting from the second cleaning, the middlings obtained from each cleaning are sequentially returned to the previous cleaning operation.

[0058] Comparative Example 1

[0059] Synchronous recovery experiments were carried out on fluorite-type rare earth ores. The technological process and the original ore used were the same as those in Example 1, except that oleic acid was used to equivalently replace the combined collector CRF in Example 1.

[0060] Comparative Example 2

[0061] Synchronous recovery experiments were carried out on fluorite-type rare earth ores. The technological process and the original ore used were the same as those in Example 1, except that a combined reagent of equivalent amounts of water glass, lignin, tannin extract, dextrin and sodium sulfate (weight ratio 20:5:10:45:20) was used to replace the combined inhibitor DRF in the example.

[0062] Comparative Example 3

[0063] Experiments on the stepwise recovery of rare earths and fluorite from fluorite-type rare earth ores were carried out. First, H205 hydroxamic acid was used for preferential flotation of rare earths, and then the tailings of rare earth flotation were used for flotation of fluorite. The original ore used was the same as that in Example 1. The technological process is shown in Figure 2 .

[0064] Experimental Example 1

[0065] The recovery test results of Example 1, Comparative Example 1, Comparative Example 2 and Comparative Example 3 were statistically analyzed, and the grades and recovery rates of CaF2 and rare earths in the products at each stage were compared. The results are shown in Table 2:

[0066] Table 2

[0067]

[0068] It can be seen that for fluorite-type rare earth ores with an REO grade of 1.51% and a CaF2 grade of 16.15% in the original ore, different beneficiation schemes were used to obtain mixed concentrates of rare earths and fluorite through Figure 1 the one-stage roughing and six-stage cleaning beneficiation technological process shown. From the test conclusions in Table 2, compared with Comparative Example 1 using sodium oleate as the collector and the same inhibitor DRF, the grades of REO and CaF2 in the mixed concentrates of rare earths and fluorite obtained in the example were 0.4% and 3.77% higher than those in Comparative Example 1, respectively, and the recovery rates were 22.46% and 30.84% higher, respectively; compared with Comparative Example 2 using water glass + lignin + tannin extract + dextrin + sodium sulfate as the inhibitor and the same collector CRF, the grades of REO and CaF2 in the mixed concentrates of rare earths and fluorite obtained in the example were 0.53% and 24.13% higher than those in Comparative Example 2, respectively, and the recovery rates were 1.55% and 12.80% higher, respectively.

[0069] And Comparative Example 3 used Figure 2In the general sequential flotation method of rare earth and fluorite shown, hydroxamic acid preferentially floats rare earth, resulting in a REO grade of only 6.45% and a REO recovery rate of only 12.91%. The tailings of rare earth flotation are used to float fluorite. Sodium oleate is used as the collector, and the inhibitors used include sodium carbonate and water glass added in the rare earth flotation operation, as well as various compositions composed of lignin, tannin extract, dextrin, and sodium sulfate. However, the CaF2 grade and recovery rate of the fluorite concentrate are 77.45% and 25.17% respectively. Neither can better rare earth concentrate indexes be obtained preferentially, nor are the fluorite concentrate indexes good.

[0070] It can be seen from the experimental results of the invention examples and comparative examples that the simultaneous use of the combined collector CRF and the combined inhibitor DRF in the invention examples can effectively improve the ore dressing indexes of the mixed concentrate of rare earth and fluorite in fluorite-type rare earth ore.

[0071] Example 2

[0072] A closed-circuit experiment for synchronous recovery of fluorite-type rare earth ore is carried out, that is, on the basis of Example 1, the mixed concentrate of rare earth and fluorite is separated. The experimental process is shown in Figure 3 .

[0073] Specifically, the mixed concentrate of rare earth and fluorite obtained from the sixth cleaning of synchronous flotation of rare earth and fluorite is transferred into a flotation cell, and sulfuric acid (900 g / t, maintaining the pH value at about 4 - 5) and the DRF inhibitor (800 g / t) are added at one time and stirred for 3 minutes, then the combined collector CRF (450 g / t) is added and stirred for 3 minutes, and the first separation flotation is carried out with an air inflow rate of 2 L / min to obtain the foam product and the bottom product of the first separation flotation. The bottom product is a fluorite enrichment.

[0074] The foam product of the first separation flotation is transferred into a flotation cell, sulfuric acid (600 g / t, maintaining the pH value at about 4 - 5) is added in sequence and stirred for 3 minutes, and the second separation flotation is carried out with an air inflow rate of 2 L / min to obtain the foam product and the bottom product of the second separation flotation. The bottom product is a separated flotation fluorite enrichment.

[0075] The foam product of the second separation flotation is transferred into a flotation cell, sulfuric acid (400 g / t, maintaining the pH value at about 4 - 5) is added and stirred for 3 minutes, and the third separation flotation is carried out with an air inflow rate of 2 L / min to obtain the foam product and the bottom product of the third separation flotation. The bottom product is a separated flotation middling ore.

[0076] The foam product of the third separation flotation is transferred into a flotation cell, sulfuric acid (200 g / t, maintaining the pH value at about 4 - 5) is added and stirred for 3 minutes, and the fourth separation flotation is carried out with an air inflow rate of 2 L / min to obtain the foam product and the bottom product of the fourth separation flotation. The bottom product is a separated flotation middling ore.

[0077] The foam product obtained from the fourth separation flotation is the rare earth concentrate. The middlings from the second, third, and fourth separation flotation operations are centrally returned to the first separation flotation operation. The magnetic product obtained by subjecting the rare earth concentrate obtained through separation flotation to high-intensity magnetic separation is the final rare earth concentrate product. The non-magnetic product obtained by subjecting the fluorite concentrate to high-intensity magnetic separation is the final fluorite concentrate product. The non-magnetic product obtained by subjecting the rare earth concentrate to high-intensity magnetic separation and the magnetic product obtained by subjecting the fluorite concentrate to high-intensity magnetic separation are combined and recycled back to the flotation operation of the rare earth and fluorite mixed concentrate.

[0078] Comparative Example 4

[0079] A closed-circuit experiment for synchronous recovery of fluorite-type rare earth ore was carried out, that is, the rare earth-fluorite mixed concentrate was separated on the basis of Example 1. The experimental process is shown in Figure 4 .

[0080] Specifically, the rare earth-fluorite mixed concentrate obtained from the sixth cleaning is first subjected to roughing by high-intensity magnetic separation with a magnetic field intensity of 1.0 T. The non-magnetic product is then subjected to scavenging by high-intensity magnetic separation with a magnetic field intensity of 1.2 T. The non-magnetic product obtained is the fluorite concentrate. The magnetic product obtained and the magnetic product obtained from the first high-intensity magnetic separation with a magnetic field intensity of 1.0 T are combined and then subjected to cleaning by high-intensity magnetic separation with a magnetic field intensity of 1.2 T. The magnetic product obtained is the rare earth concentrate, and the non-magnetic product obtained is returned to the first high-intensity magnetic separation operation.

[0081] Experimental Example 2

[0082] The test results of Example 2 and Comparative Example 4 were statistically analyzed, and the grades and recovery rates of CaF2 and REO in the products at each stage were compared, as shown in Table 3:

[0083] Table 3

[0084]

[0085] The experimental results of Example 2 and Comparative Example 4 show that for the rare earth-fluorite mixed concentrate obtained in Example 1, pre-flotation and then magnetic separation can significantly improve the indexes of the final high-value rare earth concentrate compared with direct magnetic separation of the rare earth-fluorite mixed concentrate.

[0086] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the techniques or knowledge in related fields. And the changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A reagent for synchronous recovery of rare earth and fluorite from fluorite-type rare earth ore, characterized in that: It includes a collector CRF and an inhibitor DRF; The collector CRF is a combined reagent including fatty acid, alkyl aminopropionate monoester and sulfobetaine; The inhibitor DRF is a combined reagent including aromatic sulfonate condensate, water glass, lignosulfonate and tannin extract; 2. The medicament according to claim 1, characterized in that: The fatty acid in the collector CRF includes at least one of oleic acid, oxidized paraffin soap, tall oil and naphthenic acid; 3. The medicament according to claim 1, characterized in that: The molecular formula of the alkyl aminopropionate monoester in the collector CRF is RNHCH2CH2COOH, where R is selected from hydrocarbon groups of C 10 ~C 18 ; The hydrocarbon group is substituted by one or more independent hydrogen atoms, alkyl groups, halogens, methoxy groups, aryl groups and heteroaryl groups respectively; 4. The medicament according to claim 1, wherein: The molecular formula of sulfobetaine in the collector CRF is CH3(CH2) n N + (CH3)2(CH2) m SO3 - or CH3(CH2CH2O) n N + (CH3)2(CH2) m SO3 - , where n = 7 to 17 and m ≥ 2.

5. The medicament according to claim 1, characterized in that: The aromatic sulfonate condensate in the inhibitor DRF includes compounds of formula (I) to formula (IV); 。 6. The medicament according to claim 1, characterized in that: . In the collector CRF, the weight ratio of the fatty acid, alkyl aminopropionate monoester and sulfobetaine is 5-8:1-3:1-3; 7. The medicament according to claim 1, characterized in that: . The weight ratio of the aromatic sulfonate condensate, water glass, lignosulfonate and tannin extract is 30-50:20-40:10-30:5-15; 8. The application of the reagent according to any one of claims 1-7 in the flotation separation of fluorite-type rare earth ore.

9. The application according to claim 8, wherein: The specific method of the flotation separation includes: S1: Grinding the raw ore into pulp, adjusting the pH value to 8-9, adding the inhibitor DRF and stirring for pulp conditioning, then adding the collector CRF and stirring for pulp conditioning. After pulp conditioning, aerate for synchronous flotation of rare earth and fluorite, and beneficiate the foam products obtained by flotation to obtain a mixed concentrate of rare earth and fluorite; S2: Adjust the mixed concentrate to pH 4-5 with acid, add acidified water glass and sodium lignosulfonate and stir for pulp conditioning, then add the collector CRF and stir for pulp conditioning. After aerated flotation, the foam product obtained is a rare earth concentrate, and the bottom product obtained is a fluorite concentrate.

10. According to the application described in claim 9, characterized in that: Performing strong magnetic separation on the rare earth concentrate to obtain the magnetic product as the final rare earth concentrate; Performing strong magnetic separation on the fluorite concentrate to obtain the non-magnetic product as the final fluorite concentrate.

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