Flotation method for fluorite in diluted tailings

Abstract

The flotation method comprises the steps that S1, reagent removal and concentration are conducted on the tailings subjected to ore dressing, raw ore is obtained, an inhibitor A, an inhibitor B, an inhibitor C, an inhibitor D and a pre-grinding ore conditioning agent are sequentially added into the raw ore to be mixed, then pre-grinding ore operation is conducted, grading treatment is conducted, graded underflow is returned to pre-grinding operation, and ore dressing is conducted; mixing graded overflow with water to prepare raw ore pulp; s2, the raw ore pulp is subjected to two times of roughing I and roughing II and two times of scavenging, and tailings are obtained; s3, after concentrate obtained after roughing I is subjected to four-time first-stage rough concentration, rough concentration regrinding operation and grading treatment are conducted, grading overflow is subjected to four-time second-stage rough concentration, fluorite rough concentrate is obtained, and middlings are sequentially returned; and S4, after the concentrate obtained through roughing II is subjected to three-time first-stage fine concentration, fine concentration regrinding operation and grading treatment, grinding is conducted till grading overflow with the particle size of-500 meshes accounting for 87%-97% is obtained, then four-time second-stage fine concentration is conducted, fluorite fine concentrate is obtained, and middlings are sequentially returned.

Description

Technical field:

[0001] The invention relates to the technical field of fluorite flotation, and in particular to a flotation method for fluorite in rare tailings. Background technology:

[0002] Fluorite is the main source of fluorine in modern fluorine chemical industry, and therefore an important mineral raw material for modern industry. Fluorite is widely used in traditional fields such as metallurgy, chemical industry, and building materials. With the application of fluorite in new energy, new materials and other fields, the demand for fluorite is growing.

[0003] After the flotation of iron in the Bayan Obo iron ore, iron tailings are produced. The iron tailings contain fluorite and rare earth, dolomite, monazite, calcite, phosphate rock, barite, quartz and other minerals. At present, in order to recover the fluorite in the iron tailings, the iron tailings are first subjected to the flotation of rare earth, and the obtained rare tailings are then flotated for fluorite. For example, the existing patent CN116618184A discloses a method for recovering iron tailings and its use, which discloses slurrying of rare earth tailings to obtain a rare earth tailings slurry of 35wt%; At 30℃, 0.5kg / t of water glass, 0.25kg / t of tannin, and 0.4kg / t of sodium oleate were added to the rare earth tailings slurry in sequence to adjust the slurry pH value to 9.5; after a closed-circuit process of one roughing and eight fines, and the merging of the intermediate ore and returning to the roughing, fluorite concentrate and fluorite tailings were obtained. The fluorite grade finally obtained by this method was 93%, but the fluorite grade and recovery rate still need to be improved. The main reasons for the inability to further improve the fluorite grade and recovery rate are as follows:

[0004] 1. Rare earth flotation reagents need to be added to the iron ore tailings during the flotation of rare earths. The fluorite flotation reagents used in the fluorite flotation process will react with the rare earth flotation reagents, resulting in a decrease in the effective fluorite flotation reagents in the fluorite flotation process, affecting the flotation effect of fluorite and reducing the recovery rate of fluorite.

[0005] 2. In the process used in the above patent, the mixing effect of the diluted tailings from the mill and the fluorite flotation agent is not good. This is mainly because the fluorite flotation agent is directly mixed with the diluted tailings slurry. During the addition of the fluorite flotation agent, it is easy to agglomerate when it encounters water, which affects the uniformity of the mixing of the fluorite flotation agent and the diluted tailings, resulting in poor fluorite flotation effect.

[0006] 3. In the above patent, only one grinding is performed. When the particle size of the grinding is too fine, i.e., -325 mesh accounts for 90%-100%, the viscosity of the selected tailings will increase, affecting the separation effect of fluorite and tailings during flotation, and reducing the fluorite recovery rate; when the particle size of the grinding is too coarse, the impurities contained in the fluorite ore cannot be separated, resulting in increased difficulty in fluorite flotation in the selected tailings, affecting the grade of fluorite, so it is more difficult to control the grinding particle size of the selected tailings slurry.

[0007] 4. After a roughing process and multiple cleaning processes, the tailings of the selected rare earth are subjected to fluorite concentrate and fluorite tailings. Since the tailings contain low-grade fluorite, the low-grade fluorite is not recovered in the current process, resulting in a low fluorite recovery rate in the selected rare earth tailings and a waste of fluorite resources.

[0008] 5. Currently, rare earths are mixed in the tailings of rare earth minerals. After being ground by a mill, the tailings are directly used for fluorite flotation. Since the existing process does not recycle this part of rare earths, the fluorite concentrate floated contains rare earth components, resulting in low fluorite grade and a waste of rare earth resources. Summary of the invention:

[0009] The object of the present invention is to provide a flotation method for selecting fluorite in rare tailings.

[0010] The present invention is implemented by the following technical scheme: a flotation method for selecting fluorite in rare tailings, comprising:

[0011] S1: The tailings of the selected rare earth are de-doped and concentrated to obtain the raw ore, inhibitor A, inhibitor B, inhibitor C, inhibitor D, and pre-grinding regulator are sequentially added to the raw ore, and then the mixture is sent to the pre-grinding operation, and then the classification process is carried out, and the classification underflow returns to the pre-grinding operation. After the pre-grinding operation, the raw ore pulp is obtained, and the particle size of the raw ore pulp is -200 mesh, accounting for 87%-97%, and the pH value of the raw ore pulp is 7.5-8.5;

[0012] S2: The raw ore pulp is subjected to two roughing separations of roughing I and roughing II and secondary scavenging to obtain tailings;

[0013] S3: The concentrate of roughing I is continuously subjected to four primary roughing treatments and then to classification treatment. The classification underflow is returned to the classification treatment after the roughing and re-grinding operation. The classification overflow with a particle size of -325 mesh accounting for 90%-100% is continuously subjected to four secondary roughing treatments to obtain fluorite rough concentrate, and the middlings are returned in sequence;

[0014] The bottom flow of the first-stage roughing and selection I is sent to roughing and selection II;

[0015] S4: The concentrate of roughing II is continuously subjected to three primary fine cleanings and then to classification. The classification bottom flow is returned to the classification process after fine re-grinding. The classification overflow with a particle size of -500 mesh accounting for 87%-97% is continuously subjected to four secondary fine cleanings to obtain fluorite fine concentrate, and the middlings are returned in sequence;

[0016] The bottom flow of the first-level fine selection I is combined with the concentrate of scavenging I to enter roughing II, the bottom flow of the second-level fine selection I is subjected to fine scavenging, the tailings of the fine scavenging are combined with the tailings of scavenging II and sent to the tailings thickening tank, and the concentrate of the fine scavenging returns to the second-level fine selection I.

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

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

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

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

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

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

[0023] Further, in step S3,

[0024] The reagents and dosages added in the first-stage rough concentration are as follows: the dosage of inhibitor C in the first-stage rough concentration I is 5g / t-25g / t of raw ore, the dosage of rough concentration regulator in the first-stage rough concentration II is 15g / t-30g / t of raw ore, the dosage of inhibitor D is 65g / t-85g / t of raw ore, and the dosage of inhibitor C in the first-stage rough concentration III is 5g / t-25g / t of raw ore;

[0025] The reagents added in the rough and fine grinding operation and the classification treatment and the dosage of inhibitor A are 300g / t-500g / t of raw ore, the dosage of inhibitor B is 5g / t-25g / t of raw ore, and the dosage of inhibitor C is 5g / t-25g / t of raw ore;

[0026] The reagents and dosages added in the secondary rough selection are as follows: the dosage of the collector in the secondary rough selection I is 25g / t-45g / t of original ore, the dosage of the rough selection regulator in the secondary rough selection II is 5g / t-25g / t of original ore, the dosage of the inhibitor D is 20g / t-40g / t of original ore, and the dosage of the inhibitor C in the secondary rough selection III is 5g / t-25g / t of original ore.

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

[0028] The reagents added in the fine grinding and classification treatment are as follows: the dosage of inhibitor A is 300g / t-500g / t of raw ore, the dosage of inhibitor B is 15g / t-35g / t of raw ore, and the dosage of inhibitor C is 5g / t-25g / t of raw ore;

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

[0030] Furthermore, the inhibitor A is polyacrylamide, polyvinyl alcohol and sodium dodecylbenzene sulfonate in a weight ratio of 2-5:1-3:3-5, and water is added to mix to a mass concentration of 3%-5%; polyacrylamide is an anionic surfactant, which has an inhibitory effect on dolomite and the like, polyvinyl alcohol causes dolomite and phosphate rock to produce agglomeration effects, and the gangue is settled and separated from fluorite, and when sodium dodecylbenzene sulfonate is in full contact with dolomite and phosphate rock, its surface becomes smooth, increasing the hydrophilicity of the minerals, thereby reducing their flotation performance.

[0031] The inhibitor B is aluminum sulfate, dextrin and aluminum silicate in a weight ratio of 9-12:1-3:1-3, and water is added to mix 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 and gangue such as monazite, and improve the grade of the obtained fluorite. 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 extract with a mass concentration of 2%-4%. Tannin extract has a significant inhibitory effect on calcite, can effectively activate fluorite during the concentration process, and at the same time strengthen the inhibitory effect on gangue minerals, thereby improving the flotation separation effect of fluorite and calcite, and can obtain fluorite concentrate with higher 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, and forms hydroxyl groups in aqueous solution. When the pH of the slurry is alkaline, it will further promote the hydroxyl polymerization of aluminum or iron to generate hydroxyaluminum or hydroxyiron polymers with higher molecular weight, further enhancing its inhibitory effect on barite and quartz.

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

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

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

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

[0038] Furthermore, in step S1, the rare earth flotation tailings are de-doped 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 the reagent. The raw ore mass concentration is 45%-55%, the solid content of the overflow water containing the reagent is less than 200ppm, and the rare earth flotation reagent flows away with the overflow water of the thickener. The grade of the fluorite coarse concentrate recovered after the rare earth flotation tailings are de-doped is stable at more than 93.5%. The fluorite is recovered after the rare earth flotation tailings are de-doped, which can effectively improve the grade of the fluorite concentrate.

[0039] Advantages of the present invention:

[0040] 1. Before the pre-grinding operation, the drug removal and concentration treatment is first carried out to remove the rare earth flotation reagent contained in the rare earth tailings, which reduces the influence of the rare earth flotation reagent on the fluorite flotation reagent, ensures the efficacy of the fluorite flotation reagent 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 tailings are fully ground into the mill, which achieves the full mixing of the fluorite flotation reagent and the tailings, ensures the uniformity of the mixing, and effectively improves the fluorite flotation effect;

[0042] 3. The selected tailings are ground step by step through pre-grinding and regrinding. During pre-grinding, when the particle size is -200 mesh accounting for 87%-97%, the selected tailings are fully mixed with fluorite flotation reagents. After the selected tailings are subjected to roughing I, the mass concentration of the concentrate and tailings of roughing I is reduced. The concentrate of roughing I is subjected to roughing and fine regrinding after multiple primary roughing, and is ground to a particle size of -325 mesh accounting for 90%-100%. The tailings of roughing I are sent to roughing II. The concentrate of roughing II is subjected to fine regrinding after multiple primary fine concentrating, and is ground to a particle size of -500 mesh accounting for 87%-97%. The viscosity of the selected tailings is gradually reduced by step-by-step grinding, ensuring the effect of mixing the selected tailings with reagents;

[0043] 4. By setting up roughing II, seven fine cleanings and one fine sweeping operation, fluorite is further extracted from the tailings produced by roughing I, and the low-grade fluorite in the tailings is recovered. The grade of low-grade fluorite is more than 87%, and the recovery rate is more than 8%, which reduces the waste of fluorite resources;

[0044] 5. Preliminary separation of rare earth components contained in fluorite resources through pre-grinding operation, roughing I, the concentrate of roughing I is subjected to multiple primary roughing, roughing and re-grinding and multiple secondary roughing to obtain fluorite rough concentrate, and the fluorite rough concentrate is sent to strong magnetic separation to obtain high-grade fluorite rough concentrate; the tailings of roughing I are subjected to roughing II, and the concentrate of roughing II is subjected to multiple primary fine concentration, fine re-grinding and multiple secondary fine concentration to obtain fluorite fine concentrate, and the fluorite rough concentrate is sent to strong magnetic separation to obtain low-grade fluorite fine concentrate; after the rare earth tailings are ground to a certain particle size through pre-grinding and re-grinding operations, the rare earth is effectively stripped from the fluorite ore particles, and after strong magnetic separation, the separation of rare earth and fluorite is achieved, the rare earth resources are recovered, and the grade of fluorite is improved;

[0045] In summary, the process of "stage grinding, secondary roughing, eight roughing concentrations, seven fine concentrations and secondary scavenging" is used to recover fluorite from rare earth tailings, and a high-grade fluorite rough concentrate with a grade higher than 93.5% is obtained, and the recovery rate can reach up to 57%. A low-grade fluorite fine concentrate with a grade higher than 87.3% is obtained, and the recovery rate is more than 8%. The grade of the comprehensive concentrate is higher than 93.22%, and the recovery rate can reach up to 65%. At the same time, the grade of fluorite in the tailings is reduced to 6.7%, and the recovery rate and grade of fluorite concentrate are significantly improved, which effectively recovers the fluorite resources in the rare earth tailings. Description of the drawings:

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is the flotation flow chart of the present invention. Specific implementation method:

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The following is combined with Figure 1 The present invention is further described.

[0050] Embodiment 1:

[0051] In this example, the Bayan Obo iron mine is first subjected to iron flotation to produce iron tailings, and the iron tailings are subjected to rare earth flotation to produce rare earth tailings. The rare earth tailings are used as raw materials to recover the fluorite resources therein, wherein the fluorite grade in the rare earth tailings is 20%. The fluorite in the rare earth tailings is recovered by the process of "stage grinding, secondary roughing, eight roughing concentrations, seven fine concentrations and secondary scavenging", and the temperature of the entire flotation process is 35°C-45°C.

[0052] First, the agent is prepared, specifically: inhibitor A is polyacrylamide, polyvinyl alcohol and sodium dodecylbenzene sulfonate in a weight ratio of 3:2:4, and water is added to mix to a mass concentration of 5%;

[0053] Inhibitor B is aluminum sulfate, dextrin and aluminum silicate in a weight ratio of 10:2:1, and water is added to mix to a mass concentration of 5%;

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

[0055] Inhibitor D is water glass with a mass concentration of 5%;

[0056] The collector is oleic acid, kerosene and oxidized paraffin in a weight ratio of 8:2:2, added in stock solution;

[0057] The fine concentration regulator and the coarse concentration regulator are sulfuric acid with a mass concentration of 5%;

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

[0059] Then the fluorite in the tailings is flotated. The specific method is as follows:

[0060] S1: The tailings are concentrated by drug removal to obtain raw ore, inhibitor A, inhibitor B, inhibitor C, inhibitor D, and pre-grinding regulator are added to the raw ore in sequence, and then the mixture is sent to the pre-grinding operation, and then the classified underflow is returned to the pre-grinding operation. After the pre-grinding operation, the raw ore pulp is obtained, and the particle size of the raw ore pulp is -200 mesh, accounting for 92%, and the pH value of the raw ore pulp is 8;

[0061] The reagents and dosages added in pre-grinding are: 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 regulator is 150g / t of raw ore;

[0062] S2: The raw ore pulp is subjected to two roughing separations of roughing I and roughing II and secondary scavenging to obtain tailings;

[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 in roughing II are as follows: the dosage of collector is 110g / t of raw ore;

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

[0066] S3: The concentrate of roughing I is continuously subjected to four primary roughing treatments and then to classification treatment. The classification underflow is returned to the classification treatment after the roughing and re-grinding operation. The classification overflow with a particle size of -325 mesh accounting for 95% is continuously subjected to four secondary roughing treatments to obtain fluorite rough concentrate, and the middlings are returned in sequence;

[0067] Fluorite rough concentrate is subjected to strong magnetic separation with a magnetic field strength of 1.0T. The magnetic materials selected by the strong magnetic separation are returned to the rough and fine grinding operation, and the selected non-magnetic materials are concentrated and filtered to obtain high-grade fluorite rough concentrate;

[0068] The bottom flow of the first-stage roughing and selection I is sent to roughing and selection II;

[0069] The reagents and dosages added in the primary rough concentration are as follows: the dosage of inhibitor C in the primary rough concentration I is 10g / t of raw ore, the dosage of the rough concentration regulator in the primary rough concentration II is 25g / t of raw ore, the dosage of inhibitor D is 75g / t of raw ore, the dosage of inhibitor C in the primary rough concentration III is 10g / t of raw ore, and the primary rough concentration IV is blank concentration without adding any reagents;

[0070] The reagents and dosages added in the coarse and fine grinding operation and the 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 in the secondary rough concentration are as follows: the dosage of the collector in the secondary rough concentration I is 35g / t of the original ore, the dosage of the rough concentration regulator in the secondary rough concentration II is 10g / t of the original ore, the dosage of the inhibitor D is 30g / t of the original ore, the dosage of the inhibitor C in the secondary rough concentration III is 10g / t of the original ore, and the secondary rough concentration IV is blank concentration without adding any reagents;

[0072] S4: The concentrate of roughing II is continuously subjected to three primary fine cleanings and then to classification. The classification bottom flow is returned to the classification process after fine re-grinding. The classification overflow with a particle size of -500 mesh accounting for 90% is continuously subjected to four secondary fine cleanings to obtain fluorite fine concentrate, and the middlings are returned in sequence;

[0073] Fluorite fine concentrate is subjected to strong magnetic separation with a magnetic field strength of 1.0T. The magnetic materials selected by the strong magnetic separation are returned to the fine grinding operation, and the selected non-magnetic materials are concentrated and filtered to obtain low-grade fluorite fine concentrate;

[0074] The bottom flow of the first-level fine selection I is combined with the concentrate of scavenging I to enter roughing II, the bottom flow of the second-level fine selection I is subjected to fine scavenging, the tailings of the fine scavenging are combined with the tailings of scavenging II and sent to the tailings thickening tank, and the concentrate of the fine scavenging returns to the second-level fine selection I.

[0075] The reagents and dosages added in the first-level fine concentration are as follows: the dosage of inhibitor C in the first-level fine concentration I is 10g / t of raw ore, the dosage of the fine concentration regulator in the first-level fine concentration 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 in fine grinding and grading treatment are as follows: inhibitor A is 400g / t of raw ore, inhibitor B is 25g / t of raw ore, and inhibitor C is 10g / t of raw ore;

[0077] The reagents and dosages added in the secondary fine concentration are as follows: the dosage of the fine concentration regulator in the secondary fine concentration I is 7g / t of original ore, the dosage of the inhibitor D is 21g / t of original ore, the dosage of the inhibitor C in the secondary fine concentration II is 10g / t of original ore, and the secondary fine concentration III and the secondary fine concentration IV are blank concentration without adding any reagents.

[0078] Embodiment 2:

[0079] In this example, the Bayan Obo iron mine is first subjected to iron flotation to produce iron tailings, and the iron tailings are subjected to rare earth flotation to produce rare earth tailings. The rare earth tailings are used as raw materials to recover the fluorite resources therein, wherein the fluorite grade in the rare earth tailings is 20%. The fluorite in the rare earth tailings is recovered by the process of "stage grinding, secondary roughing, eight roughing concentrations, seven fine concentrations and secondary scavenging", and the temperature of the entire flotation process is 35°C-45°C.

[0080] First, the agent is prepared, specifically: Inhibitor A is polyacrylamide, polyvinyl alcohol and sodium dodecylbenzene sulfonate in a weight ratio of 2:1:3, and water is added to mix to a mass concentration of 3%;

[0081] Inhibitor B is aluminum sulfate, dextrin and aluminum silicate in a weight ratio of 9:1:1, and water is added to mix to a mass concentration of 3%;

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

[0083] Inhibitor D is water glass with a mass concentration of 3%;

[0084] The collector is oleic acid, kerosene and oxidized paraffin in a weight ratio of 6:1:1, added in stock solution;

[0085] The fine concentration regulator and the coarse concentration regulator are sulfuric acid with a mass concentration of 3%;

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

[0087] Then the fluorite in the tailings is flotated. The specific method is as follows:

[0088] S1: The tailings are concentrated by drug removal to obtain raw ore, inhibitor A, inhibitor B, inhibitor C, inhibitor D, and pre-grinding regulator are added to the raw ore in sequence, and then the mixture is sent to the pre-grinding operation, and then the classified underflow is returned to the pre-grinding operation. After the pre-grinding operation, the raw ore pulp is obtained, and the particle size of the raw ore pulp is -200 mesh, accounting for 87%, and the pH value of the raw ore pulp is 7.5;

[0089] The reagents and dosages added in pre-grinding are: 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 regulator is 100g / t of raw ore;

[0090] S2: The raw ore pulp is subjected to two roughing separations of roughing I and roughing II and secondary scavenging to obtain tailings;

[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 in roughing II are as follows: the dosage of collector is 60g / t of raw ore;

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

[0094] S3: The concentrate of roughing I is continuously subjected to four primary roughing treatments and then to classification treatment. The classification underflow is returned to the classification treatment after the roughing and re-grinding operation. The classification overflow with a particle size of -325 mesh accounting for 90% is continuously subjected to four secondary roughing treatments to obtain fluorite rough concentrate, and the middlings are returned in sequence;

[0095] Fluorite rough concentrate is subjected to strong magnetic separation with a magnetic field strength of 0.9T. The magnetic materials selected by the strong magnetic separation are returned to the rough and fine grinding operation, and the selected non-magnetic materials are concentrated and filtered to obtain high-grade fluorite rough concentrate;

[0096] The bottom flow of the first-stage roughing and selection I is sent to roughing and selection II;

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

[0098] The reagents and dosages added in the coarse and fine grinding operation and the 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 in the secondary rough concentration are as follows: the dosage of collector in the secondary rough concentration I is 25g / t of raw ore, the dosage of rough concentration regulator in the secondary rough concentration II is 5g / t of raw ore, the dosage of inhibitor D is 20g / t of raw ore, the dosage of inhibitor C in the secondary rough concentration III is 5g / t of raw ore, and the secondary rough concentration IV is blank concentration without adding any reagents;

[0100] The concentrate of S4 roughing II is continuously subjected to three primary fine cleanings and then to classification. The classification bottom flow is returned to the classification process after fine re-grinding. The classification overflow with a particle size of -500 mesh accounting for 87% is continuously subjected to four secondary fine cleanings to obtain fluorite fine concentrate, and the middlings are returned in sequence.

[0101] Fluorite fine concentrate is subjected to strong magnetic separation with a magnetic field strength of 0.9T. The magnetic materials selected by the strong magnetic separation are returned to the fine grinding operation, and the selected non-magnetic materials are concentrated and filtered to obtain low-grade fluorite fine concentrate;

[0102] The bottom flow of primary fine concentration I and the concentrate of scavenging I are combined into roughing II, the bottom flow of secondary fine concentration I is subjected to fine scavenging, the tailings of fine scavenging are combined with the tailings of scavenging II and sent to the tailings thickening tank, and the concentrate of fine scavenging returns to secondary fine concentration I;

[0103] The reagents and dosages added in the first-level fine concentration are as follows: the dosage of inhibitor C in the first-level fine concentration I is 5g / t of raw ore, the dosage of the fine concentration regulator in the first-level fine concentration 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 in fine re-grinding and grading treatment are as follows: inhibitor A is 300g / t of raw ore, inhibitor B is 15g / t of raw ore, and inhibitor C is 5g / t of raw ore;

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

[0106] Embodiment 3:

[0107] In this example, the Bayan Obo iron mine is first subjected to iron flotation to produce iron tailings, and the iron tailings are subjected to rare earth flotation to produce rare earth tailings. The rare earth tailings are used as raw materials to recover the fluorite resources therein, wherein the fluorite grade in the rare earth tailings is 20%. The fluorite in the rare earth tailings is recovered by the process of "stage grinding, secondary roughing, eight roughing concentrations, seven fine concentrations and secondary scavenging", and the temperature of the entire flotation process is 35°C-45°C.

[0108] First, the agent is prepared, specifically: Inhibitor A is polyacrylamide, polyvinyl alcohol and sodium dodecylbenzene sulfonate in a weight ratio of 5:3:5, and water is added to mix to a mass concentration of 7%;

[0109] Inhibitor B is aluminum sulfate, dextrin and aluminum silicate in a weight ratio of 12:3:3, and water is added to mix to a mass concentration of 7%;

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

[0111] Inhibitor D is water glass with a mass concentration of 7%;

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

[0113] The fine concentration regulator and the coarse concentration regulator are sulfuric acid with a mass concentration of 7%;

[0114] Then the fluorite in the tailings is flotated. The specific method is as follows:

[0115] S1: The raw ore is obtained by removing the drug and concentrating the tailings. Inhibitor A, inhibitor B, inhibitor C, inhibitor D and pre-grinding regulator are added to the raw ore in sequence, and then the mixture is sent to the pre-grinding operation. After classification treatment, the classified underflow returns to the pre-grinding operation. After the pre-grinding operation, the raw ore pulp is obtained. The particle size of the raw ore pulp is -200 mesh, accounting for 97%, and the pH value of the raw ore pulp is 8.5;

[0116] The reagents and dosages added in pre-grinding are: 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 regulator is 200g / t of raw ore;

[0117] S2: The raw ore pulp is subjected to two roughing separations of roughing I and roughing II and secondary scavenging to obtain tailings;

[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 in roughing II are as follows: the dosage of collector is 160g / t of raw ore;

[0120] The reagents and dosages added in the secondary scavenging are: the dosage of the collector in scavenging I is 45g / t of raw ore, and the dosage of the collector in scavenging II is 30g / t of raw ore;

[0121] S3: The concentrate of roughing I is continuously subjected to four primary roughing treatments and then to classification treatment. The classification underflow is returned to the classification treatment after the roughing and re-grinding operation. The classification overflow with a particle size of -325 mesh accounting for 98% is continuously subjected to four secondary roughing treatments to obtain fluorite rough concentrate, and the middlings are returned in sequence;

[0122] Fluorite rough concentrate is subjected to strong magnetic separation with a magnetic field strength of 1.2T. The magnetic materials selected by the strong magnetic separation are returned to the rough and fine grinding operation, and the selected non-magnetic materials are concentrated and filtered to obtain high-grade fluorite rough concentrate;

[0123] The bottom flow of the first-stage roughing and selection I is sent to roughing and selection II;

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

[0125] The reagents and dosages added in the coarse and fine grinding operation and the 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 in the secondary rough concentration are as follows: the dosage of the collector in the secondary rough concentration I is 45g / t of the original ore, the dosage of the rough concentration regulator in the secondary rough concentration II is 25g / t of the original ore, the dosage of the inhibitor D is 40g / t of the original ore, the dosage of the inhibitor C in the secondary rough concentration III is 25g / t of the original ore, and the secondary rough concentration IV is blank concentration without adding any reagents;

[0127] S4: The concentrate of roughing II is continuously subjected to three primary fine cleanings and then to classification. The classification bottom flow is returned to the classification process after fine re-grinding. The classification overflow with a particle size of -500 mesh accounting for 90% is continuously subjected to four secondary fine cleanings to obtain fluorite fine concentrate, and the middlings are returned in sequence;

[0128] Fluorite fine concentrate is subjected to strong magnetic separation with a magnetic field strength of 1.2T. The magnetic materials selected by the strong magnetic separation are returned to the fine grinding operation, and the selected non-magnetic materials are concentrated and filtered to obtain low-grade fluorite fine concentrate;

[0129] The bottom flow of the first-level fine selection I is combined with the concentrate of scavenging I to enter roughing II, the bottom flow of the second-level fine selection I is subjected to fine scavenging, the tailings of the fine scavenging are combined with the tailings of scavenging II and sent to the tailings thickening tank, and the concentrate of the fine scavenging returns to the second-level fine selection I.

[0130] The reagents and dosages added in the first-level fine concentration are as follows: the dosage of inhibitor C in the first-level fine concentration I is 5g / t of raw ore, the dosage of the fine concentration regulator in the first-level fine concentration 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 in fine re-grinding and grading treatment are as follows: inhibitor A is 500g / t of raw ore, inhibitor B is 35g / t of raw ore, and inhibitor C is 25g / t of raw ore;

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

[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 specifically as follows:

[0135] S1: The classified underflow returns to the pre-grinding operation, and the raw ore pulp is obtained after the pre-grinding operation. The particle size of the raw ore pulp is -200 mesh, accounting for 92%. Inhibitor A, inhibitor B, inhibitor C, inhibitor D, and pre-grinding regulator are added to the raw ore pulp in sequence, and the raw ore pulp is sent to the roughing I for subsequent treatment.

[0136] During the pre-grinding operation, the mixing of fluorite flotation reagent and raw ore pulp is poor, which 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 no coarse and fine grinding operations or fine and fine grinding operations are performed, and the corresponding steps are specifically as follows:

[0139] S1: The tailings are concentrated by drug removal 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 the mixture is sent to the grinding operation, and then the classification process is carried out, and the classification underflow is returned to the grinding operation. After the grinding operation, the raw ore pulp is obtained, and the particle size of the raw ore pulp is -325 mesh, accounting for 95%;

[0140] S3: The concentrate of roughing I is subjected to four primary roughing and four secondary roughing to obtain a fluorite rough concentrate;

[0141] S4: The concentrate of roughing II is subjected to three primary fine concentrations and four secondary fine concentrations to obtain fluorite fine concentrate.

[0142] Without coarse and fine re-grinding operations, the particle size of the original ore pulp obtained after the grinding operation meets the flotation requirements of fluorite, but the viscosity is relatively high during the initial flotation, which makes it difficult to separate fluorite from tailings during the flotation process and the fluorite recovery rate is low.

[0143] Comparative Example 3:

[0144] The difference from Example 1 is that the obtained fluorite coarse concentrate and fluorite fine concentrate are not subjected to high-intensity magnetic separation.

[0145] The fluorite coarse concentrate and fluorite fine concentrate produced in Comparative Example 3 are mixed with a certain amount of rare earth components. If they are not subjected to strong magnetic separation, the grade of the fluorite coarse concentrate and fluorite fine concentrate will be affected, and rare earth resources will be wasted.

[0146] Comparative Example 4:

[0147] The difference from Example 1 is that the selected tailings are not de-doped and concentrated, and inhibitor A, inhibitor B, inhibitor C, inhibitor D, and pre-grinding regulator are added to the selected tailings in sequence and mixed, and then sent to the pre-grinding operation. The corresponding steps are specifically as follows:

[0148] S1: Inhibitor A, inhibitor B, inhibitor C, inhibitor D and pre-grinding regulator are added to the rare earth tailings in sequence, and then sent to the pre-grinding operation after mixing. After classification treatment, the classified underflow returns to the pre-grinding operation. After the pre-grinding operation, the original ore pulp is obtained. The particle size of the original ore pulp is -200 mesh, accounting for 92%, and the pH value of the original ore pulp is 7.

[0149] In Comparative Example 4, the rare earth tailings were not subjected to drug removal and concentration treatment, so that the rare earth flotation reagent reacted with the fluorite flotation reagent during the fluorite flotation process, inhibiting the efficacy of the fluorite flotation reagent, affecting the fluorite flotation effect, and reducing the fluorite recovery rate.

[0150] Comparative Example 5:

[0151] According to the existing patented method, fluorite is flotated:

[0152] Slurrying the rare earth tailings to obtain rare earth tailings slurry, wherein the mass concentration of the rare earth tailings slurry is 35wt%;

[0153] Add water glass, polyphenol derivatives, and related substances of sodium oleate to the rare earth tailings slurry in sequence, with the addition amount of water glass being 2.5 kg / t, the addition amount of polyphenol derivatives being 0.15 kg / t, and the addition amount of tannin and sodium oleate being 0.5 kg / t;

[0154] After one roughing and eight fine flotation, i.e. one roughing and eight fine flotation, the pH value of the rare earth tailings slurry is adjusted to 9.5, and then the middlings are merged and returned to the closed-loop process of roughing.

[0155] The fluorite flotation process adopted in Comparative Example 5 is one roughing selection and eight fine selections. Compared with the process of "stage grinding, secondary roughing selection, eight roughing selections, seven fine selections and secondary scavenging selections" in Example 1, since it is only ground once and mixed with fluorite flotation reagents after grinding, the mixing effect of the selected rare tailings and the reagents is poor, and the low-grade fluorite is not recovered, the recovery rate of fluorite is low.

[0156] Using the fluorite flotation methods of Examples 1-3 and Comparative Examples 1-5, a continuous production test was conducted for 3 days, and the fluorite concentrate finally obtained was sampled and analyzed to obtain the test results shown in Table 1, where the grade and recovery rate are the weighted averages of the continuous production for 3 days;

[0157] Table 1

[0158]

[0159] As can be seen from Table 1, the process of "stage grinding, secondary roughing, eight roughing, seven fine concentrations and secondary scavenging" is used to recover fluorite in the rare earth tailings. The high-grade fluorite rough concentrate with a grade higher than 93.5% obtained by Examples 1 to 3 has a recovery rate of 52%-57%, and the low-grade fluorite fine concentrate with a grade higher than 87.3% is obtained, with a recovery rate of more than 8%. The grade of the comprehensive concentrate is higher than 93.22%, and the recovery rate is 60%-65%. At the same time, the grade of fluorite in the tailings is reduced to 6.7%. Compared with the fluorite concentrates obtained in Comparative Examples 1 to 5, the recovery rate and fluorite grade of the fluorite concentrates are significantly improved, and the fluorite resources in the rare earth tailings are effectively recovered.

[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 principle of the present invention should be included in 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flotation method for selecting fluorite from rare tailings, characterized in that: include: S1: The tailings of the selected rare earth are de-doped and concentrated to obtain the raw ore, inhibitor A, inhibitor B, inhibitor C, inhibitor D, and pre-grinding regulator are sequentially added to the raw ore, and then the mixture is sent to the pre-grinding operation, and then the classification process is carried out, and the classification underflow returns to the pre-grinding operation. After the pre-grinding operation, the raw ore pulp is obtained, and the particle size of the raw ore pulp is -200 mesh, accounting for 87%-97%, and the pH value of the raw ore pulp is 7.5-8.5; S2: The raw ore pulp is subjected to two roughing separations of roughing I and roughing II and secondary scavenging to obtain tailings; S3: The concentrate of roughing I is continuously subjected to four primary roughing treatments and then to classification treatment. The classification underflow is returned to the classification treatment after the roughing and re-grinding operation. The classification overflow with a particle size of -325 mesh accounting for 90%-100% is continuously subjected to four secondary roughing treatments to obtain fluorite rough concentrate, and the middlings are returned in sequence; The bottom flow of the first-stage roughing and selection I is sent to roughing and selection II; S4: The concentrate of roughing II is continuously subjected to three primary fine cleanings and then to classification. The classification bottom flow is returned to the classification process after fine re-grinding. The classification overflow with a particle size of -500 mesh accounting for 87%-97% is continuously subjected to four secondary fine cleanings to obtain fluorite fine concentrate, and the middlings are returned in sequence; The bottom flow of the first-level fine selection I is combined with the concentrate of scavenging I to enter roughing II, the bottom flow of the second-level fine selection I is subjected to fine scavenging, the tailings of the fine scavenging are combined with the tailings of scavenging II and sent to the tailings thickening tank, and the concentrate of the fine scavenging returns to the second-level fine selection I.

2. The flotation method for fluorite in rare tailings according to claim 1, characterized in that: The fluorite coarse concentrate is subjected to strong magnetic separation with a magnetic field strength of 0.9 to 1.2 T. The magnetic materials selected by the strong magnetic separation are returned to the coarse and fine grinding operation, and the selected non-magnetic materials are concentrated and filtered to obtain a high-grade fluorite coarse concentrate.

3. The flotation method for fluorite in rare 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 1.2 T. The magnetic materials selected by the strong magnetic separation are returned to the fine grinding operation, and the selected non-magnetic materials are concentrated and filtered to obtain low-grade fluorite fine concentrate.

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

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

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

7. The flotation method for fluorite in rare tailings according to claim 1, characterized in that: In step S4, the reagents and dosages added in the primary fine concentration are as follows: the dosage of the inhibitor C in the primary fine concentration I is 5g / t-25g / t of the original ore, the dosage of the fine concentration regulator in the primary fine concentration II is 10g / t-30g / t of the original ore, and the dosage of the inhibitor D is 50g / t-70g / t of the original ore; The reagents added in the fine grinding and classification treatment are as follows: the dosage of inhibitor A is 300g / t-500g / t of raw ore, the dosage of inhibitor B is 15g / t-35g / t of raw ore, and the dosage of inhibitor C is 5g / t-25g / t of raw ore; The reagents and dosages added in the secondary fine concentration are as follows: the dosage of the fine concentration regulator in secondary fine concentration I is 5g / t-25g / t of original ore, the dosage of inhibitor D is 10g / t-30g / t of original ore, and the dosage of inhibitor C in secondary fine concentration II is 5g / t-25g / t of original ore.

8. The flotation method for fluorite in rare tailings according to any one of claims 1 to 7, characterized in that: The inhibitor A is polyacrylamide, polyvinyl alcohol and sodium dodecylbenzene sulfonate in a weight ratio of 2-5:1-3:3-5, and water is added to mix to a mass concentration of 3%-7%; The inhibitor B is aluminum sulfate, dextrin and aluminum silicate in a weight ratio of 9-12:1-3:1-3, and water is added to mix to a mass concentration of 3%-7%; The inhibitor C is tannin extract with a mass concentration of 3%-7%; The inhibitor D is water glass with a mass concentration of 3%-7%; The collector is oleic acid, kerosene and oxidized paraffin in a weight ratio of 6-9:1-3:1-3, and the stock solution is added; The fine concentration regulator and the coarse concentration regulator are sulfuric acid with a mass concentration of 3%-7%; The pre-grinding regulator is soda ash with a mass concentration of 3%-7%.

9. The flotation method for selecting fluorite in rare tailings according to claim 1, characterized in that: In step S1, the concentrated tailings are de-drugated and concentrated to obtain the raw ore. Specifically, the concentrated 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 the reagent. The mass concentration of the raw ore is 45%-55%, and the solid content of the overflow water containing the reagent is less than 200ppm.

Images