Flotation method for recovering fluorite from tailings

Abstract

The application discloses a flotation method for fluorite in rare element tailings, and comprises the following steps: S1, performing a de-drugging concentration on the rare element tailings to obtain raw ore, and sequentially adding inhibitors A, inhibitors B, inhibitors C, inhibitors D and pre-grinding regulators into the raw ore, mixing and then performing a pre-grinding operation, and then performing a classification treatment, returning a classification underflow to the pre-grinding operation, and mixing a classification overflow with water to prepare raw ore slurry; S2, performing two rough selections and secondary scavenging on the raw ore slurry to obtain tailings; S3, performing four primary rough selections on the concentrate of the rough selection I, performing rough concentrate regrinding operation and classification treatment, and then performing four secondary rough selections on the classification overflow to obtain fluorite rough concentrate, and sequentially returning middlings; and S4, performing three primary fine selections on the concentrate of the rough selection II, performing fine concentrate regrinding operation and classification treatment, grinding the classification overflow to a particle size of 87% to 97% of 500 mesh, and then performing four secondary fine selections to obtain fluorite fine concentrate, and sequentially returning middlings.

Description

Technical fields:

[0001] This invention relates to the field of fluorite flotation technology, and specifically to a flotation method for fluorite in rare earth tailings. Background technology:

[0002] Fluorite is the main source of fluorine in modern fluorochemicals, making it an important mineral raw material for modern industry. Fluorite is widely used in traditional fields such as metallurgy, chemicals, and building materials. With its applications in new energy and new materials, the demand for fluorite continues to grow.

[0003] After iron flotation at the Bayan Obo iron mine, iron tailings are produced. These tailings contain minerals such as fluorite, rare earth elements, dolomite, monazite, calcite, phosphate rock, barite, and quartz. Currently, to recover fluorite from these tailings, they are first subjected to rare earth flotation, and then fluorite is floated again in the resulting rare earth tailings. For example, the existing patent CN116618184A, "Methods and Uses for Recovering Iron Tailings," discloses a rare earth tailings slurry preparation method to obtain a 35wt% rare earth tailings slurry. At 30℃, 0.5 kg / t of water glass, 0.25 kg / t of tannin, and 0.4 kg / t of sodium oleate were added sequentially to the rare earth tailings slurry to adjust the slurry pH to 9.5. After a closed-circuit process involving one rougher and eight cleaners, with the middlings combined and returned to the rougher, fluorite concentrate and fluorite tailings were obtained. The final fluorite grade obtained by this method was 93%, but the fluorite grade and recovery rate still need to be improved. The main reasons why the fluorite grade and recovery rate cannot be further improved at present are as follows:

[0004] 1. In the process of rare earth flotation of iron tailings, rare earth flotation reagents need to be added. The fluorite flotation reagents used in the fluorite flotation process will react with the rare earth flotation reagents, which will reduce the effective fluorite flotation reagents in the fluorite flotation process, affect the flotation effect of fluorite, and reduce the recovery rate of fluorite.

[0005] 2. In the process used in the above patent, the mixing effect of the dilute tailings from the mill with the fluorite flotation reagent is not good. This is mainly because the fluorite flotation reagent is directly mixed with the dilute tailings slurry. The fluorite flotation reagent is prone to clumping when it comes into contact with water during the addition process, which affects the uniformity of the mixing between the fluorite flotation reagent and the dilute tailings, resulting in poor fluorite flotation effect.

[0006] 3. The above-mentioned patent only involves one grinding process. When the grinding particle size is too fine, with -325 mesh accounting for 90%-100%, the viscosity of the dilute tailings will increase, affecting the separation effect of fluorite and tailings during the flotation process and reducing the fluorite recovery rate. When the grinding particle size is too coarse, the impurities contained in the fluorite ore cannot be separated, which increases the difficulty of fluorite flotation in the dilute tailings and affects the grade of fluorite. Therefore, it is difficult to control the grinding particle size of the dilute tailings pulp.

[0007] 4. After one roughing and multiple cleaning processes, fluorite concentrate and fluorite tailings are obtained from the rare earth tailings. Since the tailings contain low-grade fluorite, the current process does not recover the low-grade fluorite, resulting in a low fluorite recovery rate in the rare earth tailings and a waste of fluorite resources.

[0008] 5. Currently, rare earth elements are mixed in the tailings of rare earth beneficiation. After being ground by a mill, the tailings are directly used for fluorite flotation. However, since the existing process does not recover these rare earth elements, the fluorite concentrate produced by flotation contains rare earth elements, resulting in low fluorite grade and wasting rare earth resources. Summary of the Invention:

[0009] The purpose of this invention is to provide a flotation method for fluorite in rare earth tailings.

[0010] This invention is implemented by the following technical solution: a flotation method for selecting fluorite from rare earth tailings, comprising:

[0011] S1: The tailings of the dilute minerals are de-treated and concentrated to obtain the raw ore. Inhibitor A, inhibitor B, inhibitor C, inhibitor D and pre-grinding conditioner are added to the raw ore in sequence and then mixed and sent to the pre-grinding operation. After classification treatment, the underflow of the classification is returned to the pre-grinding operation. After the pre-grinding operation, the raw ore slurry is obtained. The particle size of the raw ore slurry is -200 mesh, accounting for 87%-97%, and the pH of the raw ore slurry is 7.5-8.5.

[0012] S2: The tailings are obtained after the raw ore slurry undergoes two roughing processes, roughing I and roughing II, and a second scavenging process.

[0013] S3: After the concentrate from roughing I undergoes four consecutive primary roughing and cleaning processes, it is then classified. The underflow from the classification process is returned to the classification process after roughing and regrinding. The overflow from the classification process, with 90%-100% of the particles being -325 mesh, undergoes four consecutive secondary roughing and cleaning processes to obtain fluorite rough concentrate. The middlings are returned sequentially.

[0014] The underflow from the primary roughing and cleaning process I is sent to roughing and cleaning process II;

[0015] S4: The concentrate from roughing II undergoes three consecutive primary fine cleaning processes, followed by classification. The underflow from the classification process is then returned to the classification process after fine re-grinding. The overflow from the classification process, with 87%-97% of particles being -500 mesh, undergoes four consecutive secondary fine cleaning processes to obtain fine fluorite concentrate. The middlings are then returned sequentially.

[0016] The underflow from the first-stage fine selection process (I) is combined with the concentrate from the first-stage scavenging process (I) and enters the second-stage fine selection process (II). The underflow from the second-stage fine selection process (I) undergoes fine scavenging. The tailings from the fine scavenging process are combined with the tailings from the second-stage scavenging process and sent to the tailings thickening tank. The concentrate from the fine scavenging process is returned to the second-stage fine selection process (I).

[0017] Furthermore, the fluorite rough concentrate is subjected to strong magnetic separation with a magnetic field strength of 0.9 to 1.2T. The magnetic material separated by strong magnetic separation is returned to the rough and concentrate regrinding operation, and the non-magnetic material separated is concentrated and filtered to obtain high-grade fluorite rough concentrate. The magnetic material is rare earth, which is produced after multiple rough and concentrate regrinding operations.

[0018] Furthermore, the fluorite fine concentrate is subjected to strong magnetic separation with a magnetic field strength of 0.9 to 1.2T. The magnetic material separated by strong magnetic separation is returned to the fine re-grinding operation, and the non-magnetic material separated is concentrated and filtered to obtain low-grade fluorite fine concentrate. The magnetic material is rare earth, and the rare earth is produced after multiple fine re-grinding operations.

[0019] Furthermore, in step S1, the reagents added to the pre-grinding ore and their dosages are as follows: the dosage of inhibitor A is 2500g / t raw ore to 3500g / t raw ore, the dosage of inhibitor B is 30g / t raw ore to 70g / t raw ore, the dosage of inhibitor C is 10g / t raw ore to 50g / t raw ore, the dosage of inhibitor D is 200g / t raw ore to 400g / t raw ore, and the dosage of the pre-grinding ore conditioner is 100g / t raw ore to 200g / t raw ore.

[0020] Furthermore, in step S2, the reagents added in the roughing process I and their dosages are as follows: the dosage of the collector is 220g / t raw ore to 320g / t raw ore;

[0021] The reagents and dosages added in the roughing process II are as follows: the dosage of the collector is 60g / t raw ore to 160g / t raw ore;

[0022] The reagents and dosages added in the secondary scavenging process are as follows: the dosage of collector for scavenging I is 15g / t raw ore to 45g / t raw ore, and the dosage of collector for scavenging II is 10g / t raw ore to 30g / t raw ore.

[0023] Furthermore, in step S3,

[0024] The reagents and dosages added in the primary roughing and cleaning process are as follows: the dosage of inhibitor C in primary roughing and cleaning I is 5 g / t raw ore to 25 g / t raw ore; the dosage of the roughing and cleaning regulator in primary roughing and cleaning II is 15 g / t raw ore to 30 g / t raw ore; the dosage of inhibitor D is 65 g / t raw ore to 85 g / t raw ore; and the dosage of inhibitor C in primary roughing and cleaning III is 5 g / t raw ore to 25 g / t raw ore.

[0025] The reagents and dosages added for the roughing and re-grinding operations and the classification treatment are as follows: the dosage of inhibitor A is 300g / t raw ore to 500g / t raw ore, the dosage of inhibitor B is 5g / t raw ore to 25g / t raw ore, and the dosage of inhibitor C is 5g / t raw ore to 25g / t raw ore.

[0026] The reagents and dosages added in the secondary roughing and cleaning process are as follows: the dosage of collector I in the secondary roughing and cleaning process is 25 g / t raw ore to 45 g / t raw ore; the dosage of regulator II in the secondary roughing and cleaning process is 5 g / t raw ore to 25 g / t raw ore; the dosage of inhibitor D is 20 g / t raw ore to 40 g / t raw ore; and the dosage of inhibitor C in the secondary roughing and cleaning process is 5 g / t raw ore to 25 g / t raw ore.

[0027] Furthermore, in step S4, the reagents and dosages added in the primary fine cleaning process are as follows: the dosage of inhibitor C in primary fine cleaning I is 5g / t raw ore to 25g / t raw ore, the dosage of fine cleaning regulator in primary fine cleaning II is 10g / t raw ore to 30g / t raw ore, and the dosage of inhibitor D is 50g / t raw ore to 70g / t raw ore.

[0028] The reagents and dosages added during the fine re-grinding and grading processes are as follows: Inhibitor A is added at a rate of 300g / t raw ore to 500g / t raw ore, Inhibitor B at a rate of 15g / t raw ore to 35g / t raw ore, and Inhibitor C at a rate of 5g / t raw ore to 25g / t raw ore.

[0029] The reagents and dosages added in the secondary fine-refinement process are as follows: the dosage of the fine-refinement regulator in the secondary fine-refinement process I is 5g / t raw ore to 25g / t raw ore, the dosage of inhibitor D is 10g / t raw ore to 30g / t raw ore, and the dosage of inhibitor C in the secondary fine-refinement process II is 5g / t raw ore to 25g / t raw ore.

[0030] Furthermore, the inhibitor A is a mixture of polyacrylamide, polyvinyl alcohol, and sodium dodecylbenzenesulfonate in a weight ratio of 2-5:1-3:3-5, mixed with water to a mass concentration of 3%-5%. Polyacrylamide is an anionic surfactant that inhibits the growth of dolomite and other minerals. Polyvinyl alcohol causes dolomite and phosphate rock to agglomerate, causing gangue to settle and separate from fluorite. When sodium dodecylbenzenesulfonate comes into full contact with dolomite and phosphate rock, it makes their surfaces smooth, increases the hydrophilicity of the minerals, and thus reduces their flotation performance.

[0031] The inhibitor B is composed of aluminum sulfate, dextrin, and aluminum silicate in a weight ratio of 9-12:1-3:1-3, mixed with water to a mass concentration of 3%-5%. The combination of aluminum sulfate, dextrin, and aluminum silicate can activate fluorite, improve the separation efficiency of fluorite from gangue such as monazite, and increase the grade of fluorite obtained. At the same time, aluminum silicate can enhance the selective inhibition effect of water glass on silicon-containing minerals such as quartz.

[0032] The inhibitor C is tannin at a mass concentration of 2%-4%. Tannin has a significant inhibitory effect on calcite and can effectively activate fluorite during the beneficiation process. At the same time, it strengthens the inhibitory effect on gangue minerals, thereby improving the flotation separation effect of fluorite and calcite, and can obtain fluorite concentrate with high grade and recovery rate.

[0033] The inhibitor D is water glass with a mass concentration of 3%-5%. Water glass is an inhibitor of barite and quartz. In aqueous solution, it forms hydroxyl groups. When the pH of the slurry is alkaline, it will further promote the polymerization of hydroxyl groups of aluminum or iron to generate hydroxyaluminum or hydroxyiron polymers with higher molecular weight, which will further enhance its inhibitory effect on barite and quartz.

[0034] By combining various inhibitors, the adsorption of inhibitors on the surface of gangue minerals is promoted, the hydrophilicity of gangue minerals is enhanced, the difference in floatability between fluorite and gangue minerals is increased, and the efficient separation of fine-grained fluorite is achieved.

[0035] The collector is a mixture of oleic acid, kerosene, and oxidized paraffin in a weight ratio of 6-9:1-3:1-3, added as a stock solution; this combined collector has good selectivity and collection ability for fluorite.

[0036] The fine-refining regulator and the coarse-refining regulator are sulfuric acid with a mass concentration of 3%-7%;

[0037] The pre-grinding conditioner is soda ash with a mass concentration of 3%-7%.

[0038] Furthermore, in step S1, the rare earth flotation tailings are de-treated and concentrated to obtain the raw ore. Specifically, the rare earth flotation tailings are diluted with water to a mass concentration of 30-40% and sent to a thickener to obtain the raw ore and overflow water containing reagents. The mass concentration of the raw ore is 45%-55%, and the solid content of the overflow water containing reagents is less than 200 ppm. The rare earth flotation reagents are carried away with the overflow water of the thickener. The grade of the fluorite rough concentrate recovered after the rare earth flotation tailings are de-treated is stable at over 93.5%. The recovery of fluorite after the rare earth flotation tailings are de-treated can effectively improve the grade of the fluorite concentrate.

[0039] Advantages of this invention:

[0040] 1. Before the pre-grinding operation, the rare earth flotation reagents contained in the rare earth tailings are removed, which reduces the impact of rare earth flotation reagents on fluorite flotation reagents, ensures the efficacy of fluorite flotation reagents and the fluorite flotation effect, and improves the recovery rate of fluorite.

[0041] 2. During the pre-grinding operation, the fluorite flotation reagent and the dilute tailings are all fed into the mill, which achieves full mixing of the fluorite flotation reagent and the dilute tailings, ensures the uniformity of mixing, and effectively improves the fluorite flotation effect.

[0042] 3. The tailings of dilute mineralization are ground in stages through pre-grinding and regrinding. During pre-grinding, the tailings are ground until the particle size is -200 mesh, accounting for 87%-97%. At this time, the tailings of dilute mineralization are fully mixed with the fluorite flotation reagent. After roughing I, the mass concentration of the concentrate and tailings of roughing I is reduced. The concentrate of roughing I is then subjected to roughing and regrinding after multiple primary roughing and cleaning operations until the particle size is -325 mesh, accounting for 90%-100%. The tailings of roughing I are sent to roughing II. The concentrate of roughing II is then subjected to fine cleaning after multiple primary fine cleaning operations until the particle size is -500 mesh, accounting for 87%-97%. By grinding in stages, the viscosity of the tailings of dilute mineralization is gradually reduced, ensuring the mixing effect of the tailings of dilute mineralization and the reagent.

[0043] 4. By setting up roughing II, seven fine cleaning and one fine sweeping operation, fluorite is further extracted from the tailings produced by roughing I, and low-grade fluorite in the tailings is recovered, with the grade of low-grade fluorite exceeding 87% and a recovery rate of more than 8%, thus reducing the waste of fluorite resources.

[0044] 5. The rare earth components mixed in with fluorite resources are initially separated through pre-grinding. After roughing I, the concentrate from roughing I undergoes multiple primary roughing and cleaning processes, roughing and regrinding processes, and multiple secondary roughing and cleaning processes to obtain fluorite rough concentrate. The fluorite rough concentrate is then sent to a high-intensity magnetic separation process to obtain high-grade fluorite rough concentrate. The tailings from roughing I undergo roughing II, and the concentrate from roughing II undergoes multiple primary fine cleaning processes, fine regrinding processes, and multiple secondary fine cleaning processes to obtain fluorite fine concentrate. The fluorite rough concentrate is then sent to a high-intensity magnetic separation process to obtain low-grade fluorite fine concentrate. After grinding the rare earth tailings to a certain particle size through pre-grinding and regrinding processes, the rare earth is effectively separated from the fluorite particles. Through high-intensity magnetic separation, the rare earth and fluorite are separated, rare earth resources are recovered, and the grade of fluorite is improved.

[0045] In summary, by utilizing a process of "stage grinding, secondary roughing, eight-stage roughing and cleaning, seven-stage fine cleaning, and secondary scavenging" to recover fluorite from rare earth tailings, a high-grade fluorite rough concentrate with a grade higher than 93.5% and a recovery rate of up to 57% was obtained. A low-grade fluorite fine concentrate with a grade higher than 87.3% and a recovery rate of over 8% was obtained. The overall concentrate grade was higher than 93.22% and the recovery rate of up to 65% was achieved. At the same time, the fluorite grade in the tailings was reduced to 6.7%. Both the recovery rate and the fluorite grade of the concentrate were significantly improved, effectively recovering fluorite resources from rare earth tailings. Attached image description:

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a flotation process flow diagram of the present invention. Detailed implementation method:

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The following is in conjunction with the appendix Figure 1 The present invention will be further described below.

[0050] Example 1:

[0051] This example uses the Bayan Obo iron ore mine to first perform iron flotation to produce iron tailings. After the iron tailings are subjected to rare earth flotation, rare earth tailings are produced. The rare earth tailings are then used as raw materials to recover fluorite resources. The rare earth tailings contain 20% fluorite. The recovery of fluorite from the rare earth tailings is achieved through a process of "stage grinding, secondary roughing, eight roughing and cleaning, seven fine cleaning and secondary scavenging". The temperature of the entire flotation process is 35℃-45℃.

[0052] First, prepare the reagent, specifically: Inhibitor A is a mixture of polyacrylamide, polyvinyl alcohol, and sodium dodecylbenzenesulfonate in a weight ratio of 3:2:4, and add water to mix to a mass concentration of 5%;

[0053] Inhibitor B is a mixture of aluminum sulfate, dextrin, and aluminum silicate in a weight ratio of 10:2:1, mixed with water to a mass concentration of 5%.

[0054] Inhibitor C is tannin at a mass concentration of 2.5%;

[0055] Inhibitor D is 5% water glass by mass concentration;

[0056] The collector is a mixture of oleic acid, kerosene, and oxidized paraffin in a weight ratio of 8:2:2, added as a undiluted solution.

[0057] The fine and coarse refining agents are both sulfuric acid with a mass concentration of 5%.

[0058] The pre-grinding conditioner is 5% soda ash by mass concentration.

[0059] Then, flotation of fluorite in the tailings is carried out, and the specific method is as follows:

[0060] S1: The tailings of the dilute minerals are de-treated and concentrated to obtain the raw ore. Inhibitor A, inhibitor B, inhibitor C, inhibitor D and pre-grinding conditioner are added to the raw ore in sequence and then mixed and sent to the pre-grinding operation. After classification treatment, the underflow of the classification is returned to the pre-grinding operation. After the pre-grinding operation, the raw ore slurry is obtained. The particle size of the raw ore slurry is -200 mesh, accounting for 92%, and the pH of the raw ore slurry is 8.

[0061] The reagents and dosages added to the pre-grinding ore are as follows: the dosage of inhibitor A is 3000g / t of raw ore, the dosage of inhibitor B is 50g / t of raw ore, the dosage of inhibitor C is 30g / t of raw ore, the dosage of inhibitor D is 300g / t of raw ore, and the dosage of pre-grinding conditioner is 150g / t of raw ore.

[0062] S2: The tailings are obtained after the raw ore slurry undergoes two roughing processes, roughing I and roughing II, and a second scavenging process.

[0063] The reagents and dosages added in roughing I are as follows: the dosage of collector is 270g / t of raw ore;

[0064] The reagents and dosages added for roughing II are as follows: the dosage of collector is 110g / t of raw ore;

[0065] The reagents and dosages added for the second scavenging are as follows: the dosage of collector for scavenging I is 35g / t of raw ore, and the dosage of collector for scavenging II is 20g / t of raw ore.

[0066] S3: The concentrate from roughing I undergoes four consecutive primary roughing and cleaning processes, followed by classification. The underflow from classification is then returned to classification after roughing and regrinding. The overflow from classification, with 95% of the particles being -325 mesh, undergoes four consecutive secondary roughing and cleaning processes to obtain fluorite rough concentrate. The middlings are returned sequentially.

[0067] Fluorite rough concentrate is subjected to high-intensity magnetic separation with a magnetic field strength of 1.0T. The magnetic material separated by the high-intensity magnetic separation is returned to the rough concentrate regrinding process, while the non-magnetic material separated is concentrated and filtered to obtain high-grade fluorite rough concentrate.

[0068] The underflow from the primary roughing and cleaning process I is sent to roughing and cleaning process II;

[0069] The reagents and dosages added for primary roughing and cleaning are as follows: for primary roughing and cleaning I, the dosage of inhibitor C is 10 g / t of raw ore; for primary roughing and cleaning II, the dosage of roughing and cleaning regulator is 25 g / t of raw ore and the dosage of inhibitor D is 75 g / t of raw ore; for primary roughing and cleaning III, the dosage of inhibitor C is 10 g / t of raw ore; and for primary roughing and cleaning IV, no reagents are added for blank cleaning.

[0070] The reagents and dosages added for roughing and regrinding operations and classification treatment are as follows: the dosage of inhibitor A is 400g / t of raw ore, the dosage of inhibitor B is 15g / t of raw ore, and the dosage of inhibitor C is 10g / t of raw ore.

[0071] The reagents and dosages added for the secondary roughing and cleaning process are as follows: for the secondary roughing and cleaning process I, the dosage of the collector is 35 g / t of raw ore; for the secondary roughing and cleaning process II, the dosage of the roughing and cleaning regulator is 10 g / t of raw ore and the dosage of the inhibitor D is 30 g / t of raw ore; for the secondary roughing and cleaning process III, the dosage of the inhibitor C is 10 g / t of raw ore; and for the secondary roughing and cleaning process IV, no reagents are added for blank cleaning.

[0072] S4: The concentrate from roughing II undergoes three consecutive primary fine cleaning processes, followed by classification. The underflow from the classification process is then returned to the classification process after fine re-grinding. The overflow from the classification process, with 90% of the particles being -500 mesh, undergoes four consecutive secondary fine cleaning processes to obtain fine fluorite concentrate. The middlings are returned sequentially.

[0073] Fluorite fine concentrate is subjected to strong magnetic separation with a magnetic field strength of 1.0T. The magnetic material separated by strong magnetic separation is returned to the fine re-grinding process, while the non-magnetic material is concentrated and filtered to obtain low-grade fluorite fine concentrate.

[0074] The underflow from the first-stage fine selection process (I) is combined with the concentrate from the first-stage scavenging process (I) and enters the second-stage fine selection process (II). The underflow from the second-stage fine selection process (I) undergoes fine scavenging. The tailings from the fine scavenging process are combined with the tailings from the second-stage scavenging process and sent to the tailings thickening tank. The concentrate from the fine scavenging process is returned to the second-stage fine selection process (I).

[0075] The reagents and dosages added for primary fine cleaning are as follows: the dosage of inhibitor C for primary fine cleaning I is 10g / t of raw ore, the dosage of fine cleaning regulator for primary fine cleaning II is 20g / t of raw ore, and the dosage of inhibitor D is 60g / t of raw ore.

[0076] The reagents and dosages added for fine re-grinding and classification are as follows: the dosage of inhibitor A is 400g / t of raw ore, the dosage of inhibitor B is 25g / t of raw ore, and the dosage of inhibitor C is 10g / t of raw ore.

[0077] The reagents and dosages added for secondary fine cleaning are as follows: For secondary fine cleaning I, the dosage of fine cleaning regulator is 7 g / t of raw ore, and the dosage of inhibitor D is 21 g / t of raw ore; for secondary fine cleaning II, the dosage of inhibitor C is 10 g / t of raw ore; for secondary fine cleaning III and secondary fine cleaning IV, no reagents are added for blank cleaning.

[0078] Example 2:

[0079] This example uses the Bayan Obo iron ore mine to first perform iron flotation to produce iron tailings. After the iron tailings are subjected to rare earth flotation, rare earth tailings are produced. The rare earth tailings are then used as raw materials to recover fluorite resources. The rare earth tailings contain 20% fluorite. The recovery of fluorite from the rare earth tailings is achieved through a process of "stage grinding, secondary roughing, eight roughing and cleaning, seven fine cleaning and secondary scavenging". The temperature of the entire flotation process is 35℃-45℃.

[0080] First, prepare the reagent, specifically: Inhibitor A is a mixture of polyacrylamide, polyvinyl alcohol, and sodium dodecylbenzenesulfonate in a weight ratio of 2:1:3, and add water to mix to a mass concentration of 3%;

[0081] Inhibitor B is a mixture of aluminum sulfate, dextrin, and aluminum silicate in a weight ratio of 9:1:1, mixed with water to a mass concentration of 3%.

[0082] Inhibitor C is tannin at a mass concentration of 3%;

[0083] Inhibitor D is 3% water glass by mass concentration;

[0084] The collector is a mixture of oleic acid, kerosene, and oxidized paraffin in a weight ratio of 6:1:1, added as a undiluted solution.

[0085] The fine and coarse refining agents are both sulfuric acid with a mass concentration of 3%.

[0086] The pre-grinding conditioner is 3% soda ash by mass concentration.

[0087] Then, flotation of fluorite in the tailings is carried out, and the specific method is as follows:

[0088] S1: The tailings of the dilute minerals are de-treated and concentrated to obtain the raw ore. Inhibitor A, inhibitor B, inhibitor C, inhibitor D and pre-grinding regulator are added to the raw ore in sequence and then mixed and sent to the pre-grinding operation. After classification treatment, the underflow of the classification is returned to the pre-grinding operation. After the pre-grinding operation, the raw ore slurry is obtained. The particle size of the raw ore slurry is -200 mesh, accounting for 87%, and the pH of the raw ore slurry is 7.5.

[0089] The reagents and dosages added to the pre-grinding ore are as follows: the dosage of inhibitor A is 2500g / t of raw ore, the dosage of inhibitor B is 30g / t of raw ore, the dosage of inhibitor C is 10g / t of raw ore, the dosage of inhibitor D is 200g / t of raw ore, and the dosage of pre-grinding conditioner is 100g / t of raw ore.

[0090] S2: The tailings are obtained after the raw ore slurry undergoes two roughing processes, roughing I and roughing II, and a second scavenging process.

[0091] The reagents and dosages added in roughing I are as follows: the dosage of collector is 220g / t of raw ore;

[0092] The reagents and dosages added for roughing II are as follows: the dosage of collector is 60g / t of raw ore;

[0093] The reagents and dosages added for the second scavenging are as follows: the dosage of collector for scavenging I is 15g / t of raw ore, and the dosage of collector for scavenging II is 10g / t of raw ore.

[0094] S3: The concentrate from roughing I undergoes four consecutive primary roughing and cleaning processes, followed by classification. The underflow from classification is then returned to classification after roughing and regrinding. The overflow from classification, with 90% of the particles being -325 mesh, undergoes four consecutive secondary roughing and cleaning processes to obtain fluorite rough concentrate. The middlings are returned sequentially.

[0095] Fluorite rough concentrate is subjected to strong magnetic separation with a magnetic field strength of 0.9T. The magnetic material separated by strong magnetic separation is returned to the rough concentrate regrinding process, while the non-magnetic material is concentrated and filtered to obtain high-grade fluorite rough concentrate.

[0096] The underflow from the primary roughing and cleaning process I is sent to roughing and cleaning process II;

[0097] The reagents and dosages added for primary roughing and cleaning are as follows: the dosage of inhibitor C for primary roughing and cleaning I is 5 g / t of raw ore; the dosage of the roughing and cleaning regulator for primary roughing and cleaning II is 15 g / t of raw ore; the dosage of inhibitor D is 65 g / t of raw ore; and the dosage of inhibitor C for primary roughing and cleaning III is 5 g / t of raw ore.

[0098] The reagents and dosages added for roughing and regrinding operations and classification treatment are as follows: the dosage of inhibitor A is 300g / t of raw ore, the dosage of inhibitor B is 5g / t of raw ore, and the dosage of inhibitor C is 5g / t of raw ore.

[0099] The reagents and dosages added for the secondary roughing and cleaning process are as follows: for the secondary roughing and cleaning process I, the dosage of the collector is 25 g / t of raw ore; for the secondary roughing and cleaning process II, the dosage of the roughing and cleaning regulator is 5 g / t of raw ore, the dosage of inhibitor D is 20 g / t of raw ore; for the secondary roughing and cleaning process III, the dosage of inhibitor C is 5 g / t of raw ore; and for the secondary roughing and cleaning process IV, no reagents are added for blank cleaning.

[0100] After the S4 roughing II concentrate undergoes three consecutive primary fine cleaning processes, it is classified. The underflow of the classification process is then returned to the classification process after fine re-grinding. The overflow of the classification process, with 87% of the particles being -500 mesh, undergoes four consecutive secondary fine cleaning processes to obtain fluorite fine concentrate. The middlings are returned sequentially.

[0101] Fluorite fine concentrate is subjected to strong magnetic separation with a magnetic field strength of 0.9T. The magnetic material separated by strong magnetic separation is returned to the fine re-grinding process, while the non-magnetic material is concentrated and filtered to obtain low-grade fluorite fine concentrate.

[0102] The underflow from the first-stage fine selection I is combined with the concentrate from the scavenging I and enters the roughing II. The underflow from the second-stage fine selection I is subjected to fine scavenging. The tailings from the fine scavenging are combined with the tailings from the scavenging II and sent to the tailings thickening tank. The concentrate from the fine scavenging is returned to the second-stage fine selection I.

[0103] The reagents and dosages added for primary fine cleaning are as follows: the dosage of inhibitor C for primary fine cleaning I is 5g / t of raw ore, the dosage of fine cleaning regulator for primary fine cleaning II is 10g / t of raw ore, and the dosage of inhibitor D is 50g / t of raw ore;

[0104] The reagents and dosages added for fine re-grinding and classification are as follows: the dosage of inhibitor A is 300g / t of raw ore, the dosage of inhibitor B is 15g / t of raw ore, and the dosage of inhibitor C is 5g / t of raw ore.

[0105] The reagents and dosages added for secondary fine cleaning are as follows: For secondary fine cleaning I, the dosage of fine cleaning regulator is 5 g / t of raw ore, and the dosage of inhibitor D is 10 g / t of raw ore; for secondary fine cleaning II, the dosage of inhibitor C is 5 g / t of raw ore; for secondary fine cleaning III and secondary fine cleaning IV, no reagents are added for blank cleaning.

[0106] Example 3:

[0107] This example uses the Bayan Obo iron ore mine to first perform iron flotation to produce iron tailings. After the iron tailings are subjected to rare earth flotation, rare earth tailings are produced. The rare earth tailings are then used as raw materials to recover fluorite resources. The rare earth tailings contain 20% fluorite. The recovery of fluorite from the rare earth tailings is achieved through a process of "stage grinding, secondary roughing, eight roughing and cleaning, seven fine cleaning and secondary scavenging". The temperature of the entire flotation process is 35℃-45℃.

[0108] First, prepare the reagent, specifically: Inhibitor A is a mixture of polyacrylamide, polyvinyl alcohol, and sodium dodecylbenzenesulfonate in a weight ratio of 5:3:5, and add water to mix to a mass concentration of 7%;

[0109] Inhibitor B is a mixture of aluminum sulfate, dextrin, and aluminum silicate in a weight ratio of 12:3:3, mixed with water to a mass concentration of 7%.

[0110] Inhibitor C is tannin at a mass concentration of 7%;

[0111] Inhibitor D is 7% water glass by mass concentration;

[0112] The collector is a combination of oleic acid, kerosene, and oxidized paraffin in a weight ratio of 9:3:3, added as a undiluted solution;

[0113] The fine and coarse refining agents are both sulfuric acid with a mass concentration of 7%.

[0114] Then, flotation of fluorite in the tailings is carried out, and the specific method is as follows:

[0115] S1: The tailings of the dilute minerals are de-treated and concentrated to obtain the raw ore. Inhibitor A, inhibitor B, inhibitor C, inhibitor D and pre-grinding regulator are added to the raw ore in sequence and then mixed and sent to the pre-grinding operation. After classification treatment, the underflow of the classification is returned to the pre-grinding operation. After the pre-grinding operation, the raw ore slurry is obtained. The particle size of the raw ore slurry is -200 mesh, accounting for 97%, and the pH of the raw ore slurry is 8.5.

[0116] The reagents and dosages added to the pre-grinding ore are as follows: the dosage of inhibitor A is 3500g / t of raw ore, the dosage of inhibitor B is 70g / t of raw ore, the dosage of inhibitor C is 50g / t of raw ore, the dosage of inhibitor D is 400g / t of raw ore, and the dosage of pre-grinding conditioner is 200g / t of raw ore.

[0117] S2: The tailings are obtained after the raw ore slurry undergoes two roughing processes, roughing I and roughing II, and a second scavenging process.

[0118] The reagents and dosages added in roughing I are as follows: the dosage of collector is 320g / t of raw ore;

[0119] The reagents and dosages added for roughing II are as follows: the dosage of collector is 160g / t of raw ore;

[0120] The reagents and dosages added for the second scavenging are as follows: the dosage of collector for scavenging I is 45g / t of raw ore, and the dosage of collector for scavenging II is 30g / t of raw ore.

[0121] S3: The concentrate from roughing I undergoes four consecutive primary roughing and cleaning processes, followed by classification. The underflow from classification is then returned to classification after roughing and regrinding. The overflow from classification, with 98% of the particles being -325 mesh, undergoes four consecutive secondary roughing and cleaning processes to obtain fluorite rough concentrate. The middlings are returned sequentially.

[0122] Fluorite rough concentrate is subjected to strong magnetic separation with a magnetic field strength of 1.2T. The magnetic material separated by strong magnetic separation is returned to the rough concentrate regrinding process, while the non-magnetic material separated is concentrated and filtered to obtain high-grade fluorite rough concentrate.

[0123] The underflow from the primary roughing and cleaning process I is sent to roughing and cleaning process II;

[0124] The reagents and dosages added for primary roughing and cleaning are as follows: the dosage of inhibitor C for primary roughing and cleaning I is 25 g / t of raw ore; the dosage of the roughing and cleaning regulator for primary roughing and cleaning II is 30 g / t of raw ore; the dosage of inhibitor D is 85 g / t of raw ore; and the dosage of inhibitor C for primary roughing and cleaning III is 25 g / t of raw ore.

[0125] The reagents and dosages added for roughing and regrinding operations and classification treatment are as follows: the dosage of inhibitor A is 500g / t of raw ore, the dosage of inhibitor B is 25g / t of raw ore, and the dosage of inhibitor C is 25g / t of raw ore.

[0126] The reagents and dosages added for the secondary roughing and cleaning process are as follows: for the secondary roughing and cleaning process I, the dosage of the collector is 45 g / t of raw ore; for the secondary roughing and cleaning process II, the dosage of the roughing and cleaning regulator is 25 g / t of raw ore and the dosage of inhibitor D is 40 g / t of raw ore; for the secondary roughing and cleaning process III, the dosage of inhibitor C is 25 g / t of raw ore; and for the secondary roughing and cleaning process IV, no reagents are added for blank cleaning.

[0127] S4: The concentrate from roughing II undergoes three consecutive primary fine cleaning processes, followed by classification. The underflow from the classification process is then returned to the classification process after fine re-grinding. The overflow from the classification process, with 90% of the particles being -500 mesh, undergoes four consecutive secondary fine cleaning processes to obtain fine fluorite concentrate. The middlings are returned sequentially.

[0128] Fluorite fine concentrate is subjected to strong magnetic separation with a magnetic field strength of 1.2T. The magnetic material separated by strong magnetic separation is returned to the fine re-grinding process, while the non-magnetic material is concentrated and filtered to obtain low-grade fluorite fine concentrate.

[0129] The underflow from the first-stage fine selection process (I) is combined with the concentrate from the first-stage scavenging process (I) and enters the second-stage fine selection process (II). The underflow from the second-stage fine selection process (I) undergoes fine scavenging. The tailings from the fine scavenging process are combined with the tailings from the second-stage scavenging process and sent to the tailings thickening tank. The concentrate from the fine scavenging process is returned to the second-stage fine selection process (I).

[0130] The reagents and dosages added for primary fine cleaning are as follows: the dosage of inhibitor C for primary fine cleaning I is 5g / t of raw ore, the dosage of fine cleaning regulator for primary fine cleaning II is 30g / t of raw ore, and the dosage of inhibitor D is 70g / t of raw ore;

[0131] The reagents and dosages added for fine re-grinding and classification are as follows: the dosage of inhibitor A is 500g / t of raw ore, the dosage of inhibitor B is 35g / t of raw ore, and the dosage of inhibitor C is 25g / t of raw ore.

[0132] The reagents and dosages added for secondary fine cleaning are as follows: For secondary fine cleaning I, the dosage of fine cleaning regulator is 25g / t of raw ore, and the dosage of inhibitor D is 30g / t of raw ore; for secondary fine cleaning II, the dosage of inhibitor C is 25g / t of raw ore; for secondary fine cleaning III and secondary fine cleaning IV, no reagents are added for blank cleaning.

[0133] Comparative Example 1:

[0134] The difference from Example 1 is that no fluorite flotation reagent is added in the pre-grinding operation, and the corresponding steps are as follows:

[0135] S1: The underflow from the classification process is returned to the pre-grinding operation. After the pre-grinding operation, the raw ore slurry is obtained. The particle size of the raw ore slurry is -200 mesh, accounting for 92%. Inhibitor A, Inhibitor B, Inhibitor C, Inhibitor D and pre-grinding conditioner are added to the raw ore slurry in sequence and mixed. The raw ore slurry is then sent to roughing I for further processing.

[0136] Poor mixing of fluorite flotation reagents and raw ore pulp during pre-grinding operations affects the flotation effect of fluorite and reduces the recovery rate of fluorite.

[0137] Comparative Example 2:

[0138] The difference from Example 1 is that it does not involve coarse and fine regrinding operations; the specific steps are as follows:

[0139] S1: The tailings of the dilute minerals are de-treated and concentrated to obtain the raw ore. Inhibitor A, inhibitor B, inhibitor C, inhibitor D and pre-grinding conditioner are added to the raw ore in sequence and then mixed and sent to the grinding operation. After classification treatment, the underflow of the classification is returned to the grinding operation. After the grinding operation, the raw ore slurry is obtained. The particle size of the raw ore slurry is -325 mesh, accounting for 95%.

[0140] S3: The concentrate from roughing I is subjected to four primary roughing and cleaning processes, followed by four secondary roughing and cleaning processes to obtain fluorite rough concentrate;

[0141] S4: After the concentrate from roughing II is subjected to three primary fine cleaning processes and then four secondary fine cleaning processes, fine fluorite concentrate is obtained.

[0142] Without coarse and fine regrinding operations, the particle size of the raw ore slurry obtained through grinding operations meets the flotation requirements for fluorite. However, the viscosity is relatively high during the initial flotation, which makes it difficult to separate fluorite from tailings and results in a low fluorite recovery rate.

[0143] Comparative Example 3:

[0144] The difference from Example 1 is that the obtained fluorite rough concentrate and fluorite fine concentrate are not subjected to strong magnetic separation.

[0145] The fluorite rough and fine concentrates produced in Comparative Example 3 contain a certain amount of rare earth components. Without strong magnetic separation, the grade of the fluorite rough and fine concentrates will be affected, and rare earth resources will be wasted.

[0146] Comparative Example 4:

[0147] The difference from Example 1 is that: the dilute tailings are not subjected to de-refining and concentration; instead, inhibitor A, inhibitor B, inhibitor C, inhibitor D, and pre-grinding conditioner are added sequentially to the dilute tailings, and the mixture is then sent to the pre-grinding operation. The specific steps are as follows:

[0148] S1: Inhibitor A, Inhibitor B, Inhibitor C, Inhibitor D and pre-grinding regulator are added sequentially to the dilute tailings and mixed before being sent to the pre-grinding operation. After classification, the underflow of the classification is returned to the pre-grinding operation. After the pre-grinding operation, the raw ore slurry is obtained. The particle size of the raw ore slurry is -200 mesh, accounting for 92%, and the pH of the raw ore slurry is 7.

[0149] In Comparative Example 4, the rare earth tailings were not subjected to de-reagent concentration treatment, which caused the rare earth flotation reagents to react with the fluorite flotation reagents during the fluorite flotation process, inhibiting the efficacy of the fluorite flotation reagents, affecting the fluorite flotation effect, and reducing the fluorite recovery rate.

[0150] Comparative Example 5:

[0151] Fluorite flotation according to existing patented methods:

[0152] The rare earth tailings were slurried to obtain a rare earth tailings slurry with a mass concentration of 35 wt%.

[0153] Water glass, polyphenol derivatives, and sodium oleate were added sequentially to the rare earth tailings slurry. The amount of water glass added was 2.5 kg / t, the amount of polyphenol derivatives added was 0.15 kg / t, and the amount of tannin and sodium oleate added was 0.5 kg / t.

[0154] After one roughing and eight cleaning flotation processes, the pH of the rare earth tailings slurry is adjusted to 9.5, and then the middlings are combined and returned to the roughing process in a closed-loop process.

[0155] The fluorite flotation process used in Comparative Example 5 consisted of one roughing and eight cleaning processes. Compared with the process of "stage grinding, two roughing, eight roughing and cleaning, seven fine cleaning and two scavenging" in Example 1, the process involved only one grinding. After grinding, the fluorite was mixed with the flotation reagent, resulting in poor mixing effect between the tailings and the reagent. Furthermore, low-grade fluorite was not recovered, leading to a low fluorite recovery rate.

[0156] Using the fluorite flotation methods of Examples 1-3 and Comparative Examples 1-5, the fluorite concentrate obtained was sampled and analyzed through a 3-day continuous production test. The test results are shown in Table 1, where the grade and recovery rate are the weighted average of the 3-day continuous production.

[0157] Table 1

[0158]

[0159] As shown in Table 1, the process of "stage grinding, secondary roughing, eight-stage roughing and cleaning, seven-stage fine cleaning and secondary scavenging" was used to recover fluorite from rare earth tailings. The high-grade fluorite rough concentrate with a grade higher than 93.5% obtained through Examples 1-3 had a recovery rate of 52%-57%, and the low-grade fluorite fine concentrate with a grade higher than 87.3% had a recovery rate of more than 8%. The overall concentrate grade was higher than 93.22%, with a recovery rate of 60%-65%. At the same time, the fluorite grade in the tailings was reduced to 6.7%. Compared with the fluorite concentrate obtained by Comparative Examples 1-5, the recovery rate and fluorite grade were significantly improved, effectively recovering fluorite resources from rare earth tailings.

[0160] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0161] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flotation method for selecting fluorite from rare earth tailings, characterized in that, include: S1: The tailings of the dilute minerals are de-treated and concentrated to obtain the raw ore. Inhibitor A, inhibitor B, inhibitor C, inhibitor D and pre-grinding conditioner are added to the raw ore in sequence and then sent to the pre-grinding operation. After classification treatment, the underflow of the classification is returned to the pre-grinding operation. After the pre-grinding operation, the raw ore slurry is obtained. The particle size of the raw ore slurry is -200 mesh, accounting for 87%-97%, and the pH of the raw ore slurry is 7.5-8.

5. S2: The tailings are obtained after the raw ore slurry undergoes two roughing processes, roughing I and roughing II, and a second scavenging process. S3: After the concentrate from roughing I undergoes four consecutive primary roughing and cleaning processes, it is then classified. The underflow from the classification process is returned to the classification process after roughing and regrinding. The overflow from the classification process, with 90%-100% of the particles being -325 mesh, undergoes four consecutive secondary roughing and cleaning processes to obtain fluorite rough concentrate. The middlings are returned sequentially. The underflow from the primary roughing and cleaning process I is sent to roughing and cleaning process II; S4: The concentrate from roughing II undergoes three consecutive primary fine cleaning processes, followed by classification. The underflow from the classification process is then returned to the classification process after fine re-grinding. The overflow from the classification process, with 87%-97% of the particles being -500 mesh, undergoes four consecutive secondary fine cleaning processes to obtain fine fluorite concentrate. The middlings are then returned sequentially. The underflow from the first-stage fine selection I is combined with the concentrate from the scavenging I and enters the roughing II. The underflow from the second-stage fine selection I is subjected to fine scavenging. The tailings from the fine scavenging are combined with the tailings from the scavenging II and sent to the tailings thickening tank. The concentrate from the fine scavenging is returned to the second-stage fine selection I. The tailings are diluted with water to a mass concentration of 30-40% and sent to a thickener to obtain raw ore and overflow water containing reagents. The raw ore has a mass concentration of 45%-55%, and the overflow water containing reagents has a solid content of less than 200 ppm. The inhibitor A is a mixture of polyacrylamide, polyvinyl alcohol and sodium dodecylbenzenesulfonate in a weight ratio of 2-5:1-3:3-5, mixed with water to a mass concentration of 3%-7%. The inhibitor B is composed of aluminum sulfate, dextrin, and aluminum silicate in a weight ratio of 9-12:1-3:1-3, mixed with water to a mass concentration of 3%-7%. The inhibitor C is tannin at a mass concentration of 3%-7%; The inhibitor D is water glass with a mass concentration of 3%-7%; The collector is a mixture of oleic acid, kerosene, and oxidized paraffin in a weight ratio of 6-9:1-3:1-3, added as a stock solution. The fine and coarse refining agents are sulfuric acid with a mass concentration of 3%-7%; The pre-grinding conditioner is soda ash with a mass concentration of 3%-7%; The fluorite rough concentrate is subjected to strong magnetic separation with a magnetic field strength of 0.9 to 1.2T. The magnetic material separated by strong magnetic separation is returned to the rough concentrate regrinding process, and the non-magnetic material separated is concentrated and filtered to obtain high-grade fluorite rough concentrate.

2. The flotation method for removing fluorite from rare earth tailings according to claim 1, characterized in that, The fluorite fine concentrate is subjected to strong magnetic separation with a magnetic field strength of 0.9 to 1.2T. The magnetic material separated by strong magnetic separation is returned to the fine re-grinding operation, and the non-magnetic material separated is concentrated and filtered to obtain low-grade fluorite fine concentrate.

3. The flotation method for selecting fluorite from rare earth tailings according to claim 1, characterized in that, In step S1, the reagents added to the pre-grinding ore and their dosages are as follows: the dosage of inhibitor A is 2500 g / t raw ore to 3500 g / t raw ore, the dosage of inhibitor B is 30 g / t raw ore to 70 g / t raw ore, the dosage of inhibitor C is 10 g / t raw ore to 50 g / t raw ore, the dosage of inhibitor D is 200 g / t raw ore to 400 g / t raw ore, and the dosage of the pre-grinding ore conditioner is 100 g / t raw ore to 200 g / t raw ore.

4. The flotation method for selecting fluorite from rare earth tailings according to claim 1, characterized in that, In step S2, the reagents and dosages added in the roughing process I are as follows: the dosage of the collector is 220 g / t raw ore to 320 g / t raw ore; The reagents and dosages added in the roughing process II are as follows: the dosage of the collector is 60g / t raw ore to 160g / t raw ore; The reagents and dosages added in the secondary scavenging process are as follows: the dosage of collector for scavenging I is 15g / t raw ore to 45g / t raw ore, and the dosage of collector for scavenging II is 10g / t raw ore to 30g / t raw ore.

5. The flotation method for selecting fluorite from rare earth tailings according to claim 1, characterized in that, In step S3, the reagents and dosages added in the primary roughing and cleaning process are as follows: the dosage of inhibitor C in primary roughing and cleaning I is 5 g / t raw ore to 25 g / t raw ore; the dosage of the roughing and cleaning regulator in primary roughing and cleaning II is 15 g / t raw ore to 30 g / t raw ore; the dosage of inhibitor D is 65 g / t raw ore to 85 g / t raw ore; and the dosage of inhibitor C in primary roughing and cleaning III is 5 g / t raw ore to 25 g / t raw ore. The reagents and dosages added for the roughing and re-grinding operations and the classification treatment are as follows: the dosage of inhibitor A is 300g / t raw ore to 500g / t raw ore, the dosage of inhibitor B is 5g / t raw ore to 25g / t raw ore, and the dosage of inhibitor C is 5g / t raw ore to 25g / t raw ore. The reagents and dosages added in the secondary roughing and cleaning process are as follows: the dosage of collector I in the secondary roughing and cleaning process is 25 g / t raw ore to 45 g / t raw ore; the dosage of regulator II in the secondary roughing and cleaning process is 5 g / t raw ore to 25 g / t raw ore; the dosage of inhibitor D is 20 g / t raw ore to 40 g / t raw ore; and the dosage of inhibitor C in the secondary roughing and cleaning process is 5 g / t raw ore to 25 g / t raw ore.

6. The flotation method for removing fluorite from rare earth tailings according to claim 1, characterized in that, In step S4, the reagents and dosages added in the primary fine cleaning process are as follows: the dosage of inhibitor C in primary fine cleaning I is 5g / t raw ore to 25g / t raw ore, the dosage of fine cleaning regulator in primary fine cleaning II is 10g / t raw ore to 30g / t raw ore, and the dosage of inhibitor D is 50g / t raw ore to 70g / t raw ore. The reagents and dosages added during the fine re-grinding and grading processes are as follows: Inhibitor A is added at a rate of 300g / t raw ore to 500g / t raw ore, Inhibitor B at a rate of 15g / t raw ore to 35g / t raw ore, and Inhibitor C at a rate of 5g / t raw ore to 25g / t raw ore. The reagents and dosages added in the secondary fine-refinement process are as follows: the dosage of the fine-refinement regulator in the secondary fine-refinement process I is 5g / t raw ore to 25g / t raw ore, the dosage of inhibitor D is 10g / t raw ore to 30g / t raw ore, and the dosage of inhibitor C in the secondary fine-refinement process II is 5g / t raw ore to 25g / t raw ore.

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