Low-grade lepidolite flotation collector, preparation method and application thereof

Abstract

This invention relates to a flotation collector for low-grade lepidolite ore, its preparation method, and its application. The collector comprises the following components in parts by weight: 10-20 parts ethylene glycol monomethyl ether, 10-20 parts butyrylhydrazine, 15-30 parts fatty acid, 15-35 parts sodium cocoyl hydroxyethyl sulfonate, 15-30 parts emulsifier, and 5-10 parts sodium hydroxide. The collector of this invention has the advantages of strong collecting ability, good selectivity, good dispersion in slurry, and insensitivity to slime. It has a good enrichment effect on low-grade lepidolite ore, yielding concentrate products with good technical indicators. It provides good separation effect with a small dosage, significantly improving the recovery rate and grade of lepidolite concentrate products.

Description

Technical Field

[0001] This invention relates to the field of mineral processing engineering technology, and in particular to a flotation collector for low-grade lithium mica ore, its preparation method, and its application. Background Technology

[0002] In recent years, lithium has been widely used in the field of new energy. In my country, lepidolite and spodumene are important mineral raw materials for lithium extraction, mainly distributed in Jiangxi and Sichuan provinces. However, lithium ores are generally of low grade, especially lepidolite (mineral chemical formula KLi). 1.5 Al 1.5 (AlSi3O 10 (Li₂O content 1.23%–5.90%), there are still a large amount of low-grade lepidolite ore waiting to be developed and utilized. In addition to lepidolite, lepidolite ore usually contains other silicate minerals with similar properties, such as quartz, feldspar, and calcite. Moreover, lepidolite ore is prone to mud formation, so it is particularly important to select a collector with strong collecting ability and good selectivity in flotation.

[0003] Currently, collectors for lepidolite ore mainly include amines (primary amines, secondary amines, quaternary ammonium salts, ether amines, etc.) and combined collectors that mix amines and anionic collectors in a certain proportion. In actual production, amine collectors have a strong collecting ability for lepidolite under acidic conditions. However, due to the viscous foam produced by amine collectors, poor selectivity, and sensitivity to slime, the concentrate grade is often low. Chinese invention patent application CN114160313A discloses a high-efficiency flotation collector for lepidolite and its application. The lepidolite collector, by mass parts, includes the following components: 30-48 parts of hydrocarbon sulfonate, 10-17 parts of sodium oleate, 10-15 parts of alkyl polyamine ether, 8-12 parts of polyoxyethylene sorbitan fatty acid ester, and 12-16 parts of tannin. The lepidolite flotation method includes primary roughing, primary and secondary scavenging, and secondary cleaning. Using this collector to float lepidolite does not require pre-desliming. However, this method requires flotation under acidic conditions, which can lead to equipment corrosion and increase the difficulty of recycling water. Simply mixing amines and anionic collectors and adding them to the flotation pulp not only results in a large amount of reagents but also usually poor flotation performance. This is because the combined reagents are poorly dispersed in the pulp, the froth is not fully mineralized, and the large reagent dosage increases the viscosity of the flotation froth, leading to a large amount of gangue entrainment.

[0004] For lepidolite ore, besides selecting a highly efficient collector, the beneficiation challenge lies in controlling the slime in the slurry. Chinese invention patent CN111298978B teaches that when the lepidolite grade is high, ceramic ball milling and a staged grinding method involving coarse grinding and roughing followed by middlings regrinding and re-concentration can be used, with sodium hexametaphosphate added during flotation to control the harmful effects of fine slime on flotation. However, this method is not ideal for the flotation of low-grade lepidolite ore. Therefore, there is an urgent need for a collector and its application method to improve the grade of lepidolite concentrate and lithium recovery rate in the beneficiation of low-grade lepidolite ore. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a flotation collector for low-grade lithium mica ore. This collector is highly stable, easily dispersed, has good selectivity, and is highly adaptable to slime. It exhibits excellent enrichment effects on low-grade lithium mica ore, thereby improving the grade of lithium mica concentrate and the recovery rate of lithium during the beneficiation process of low-grade lithium mica ore.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A flotation collector for low-grade lepidolite ore comprises the following components in parts by weight:

[0008] 10-20 parts of ethylene glycol monomethyl ether, 10-20 parts of butyrylhydrazine, 15-30 parts of fatty acid, 15-35 parts of sodium cocoyl hydroxyethyl sulfonate, 15-30 parts of emulsifier, and 5-10 parts of sodium hydroxide.

[0009] Thus, in the collector of this invention, butyrylhydrazine, fatty acids, sodium cocoyl hydroxyethyl sulfonate, and sodium hydroxide are the effective components of the collector. The collector of this invention is a mixed cationic and anionic collector. The cationic component butyrylhydrazine is first selectively and physically adsorbed onto the surface of lepidolite particles. The fatty acids react with sodium hydroxide to generate sodium fatty acids. The anionic components sodium fatty acids and sodium cocoyl hydroxyethyl sulfonate are synergistically adsorbed onto the surface of lepidolite through electrostatic attraction or hydrophobic interaction between carbon chains, increasing the carbon chain density and height on the surface of lepidolite, making the surface hydrophobic adsorption layer more stable. Ethylene glycol monomethyl ether and emulsifier can transform the collector solution system into a continuous phase structure microemulsion, increasing the dispersion rate of the agent in the slurry system and shortening the time for the agent to complete adsorption on the mineral surface. It has a good enrichment effect on low-grade lepidolite ore and significantly improves the recovery rate and grade of lepidolite concentrate products.

[0010] Furthermore, the emulsifier includes one or more of glycerol, sorbitan monooleate polyoxyethylene ether (Tween 80), and isooctanol polyoxyethylene polyoxypropylene ether.

[0011] Furthermore, the fatty acid is oleic acid. Thus, oleic acid reacts with sodium hydroxide to form sodium oleate, which acts as an anion collector.

[0012] In some preferred embodiments of the present invention, the low-grade lithium mica flotation collector comprises the following components in parts by weight: 19 parts ethylene glycol monomethyl ether, 10 parts butyrylhydrazine, 20 parts oleic acid, 20 parts sodium cocoyl hydroxyethyl sulfonate, 26 parts emulsifier, and 5 parts sodium hydroxide.

[0013] A method for preparing a flotation collector for low-grade lepidolite ore includes the following steps:

[0014] Butyrylhydrazine was dissolved in ethylene glycol monomethyl ether and then mixed evenly with fatty acids; an emulsifier was added and stirred until it turned milky white; a 20%–30% (w / w) solution of coconut oil-based hydroxyethyl sulfonate sodium salt and a 20%–40% (w / w) solution of sodium hydroxide were added and stirred to obtain a low-grade lithium mica ore flotation collector (CFLY-9).

[0015] In some embodiments of the present invention, CFLY-9 is prepared as a solution with a mass concentration of 5% to 7%.

[0016] This invention also provides the application of the low-grade lepidolite flotation collector in lepidolite flotation, comprising the following steps:

[0017] S1. Grind the raw lepidolite ore to obtain flotation slurry;

[0018] S2. Use sedimentation desliming or chemical desliming methods to remove some of the slurry mud;

[0019] S3. Add flotation modifier to the deslimed slurry to adjust the pH value of the slurry, add inhibitor and collector, stir thoroughly, and then perform aeration flotation to obtain lepidolite concentrate.

[0020] Furthermore, in step S1, the grinding fineness is -0.074 mm, accounting for 65-80%. This ensures the complete dissociation of lepidolite from gangue minerals.

[0021] Further, in step S3, the modifier is sodium carbonate and sodium hydroxide, with a total flotation dosage of 1200–2000 g / t (g / t is the amount of reagent added relative to 1 ton of raw ore) and 100–300 g / t, respectively. The main function of the modifier is to adjust the pH of the slurry to slightly alkaline, soften the water, and eliminate Ca. 2+ Mg 2+ Ion effects.

[0022] Furthermore, in step S3, the slurry pH value is 8-10, at which point the reagent effect is best, and the recovery rate and grade of lepidolite concentrate are optimal. In addition, acidic or strongly alkaline conditions will reduce the recovery rate and grade of lepidolite concentrate.

[0023] Furthermore, in step S3, the inhibitor is sodium hexametaphosphate, and its total flotation dosage is 500–700 g / t. Thus, sodium hexametaphosphate can effectively disperse slime while inhibiting gangue minerals such as feldspar and quartz, indirectly improving the selectivity of the collector for adsorption on the surface of lepidolite.

[0024] Furthermore, in step S3, the flotation operation includes roughing, cleaning, and scavenging. After stirring, the slurry undergoes roughing, the roughing froth is used for cleaning operation one, the cleaning operation one froth is used for cleaning operation two, and the cleaning tailings are returned to the previous flotation process step by step; the roughing tailings undergo secondary roughing or scavenging, the secondary roughing froth is mixed with the roughing froth for cleaning operation one, the scavenging froth is returned to the roughing process, and the scavenging tailings are the final tailings.

[0025] In some embodiments of the present invention, during the roughing operation in step S3, 800-1200 g / t of sodium carbonate and 100-300 g / t of sodium hydroxide are added for pulp conditioning, followed by the addition of 200-300 g / t of the collector. During the cleaning operation, only sodium hexametaphosphate is added, at a dosage of 50-150 g / t. During the scavenging operation, sodium carbonate is first added for pulp conditioning at a dosage of 400-800 g / t, followed by sodium hexametaphosphate at a dosage of 100-300 g / t, and then the collector at a dosage of 100-200 g / t. Excessive collector dosage leads to a thicker, more viscous flotation froth layer, increased yield, and more gangue mineral inclusions. Furthermore, excess collector will physically adsorb onto the gangue minerals, causing surface activation and floating along with the lepidolite concentrate, making separation difficult and requiring a larger dosage of depressant, thus reducing the grade of the lepidolite concentrate product. Insufficient collector dosage will result in inadequate adsorption of the collector onto the surface of lepidolite, leading to a thinner foam layer, less mineralized foam, unstable foam, low concentrate yield, and decreased recovery rate.

[0026] Furthermore, the low-grade lithium mica ore has a Li2O content of 0.2% to 0.4%.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] (1) The collector described in this invention has the advantages of strong stability, strong collecting ability, no stratification after long-term storage, low temperature resistance, easy dispersion, good selectivity, good dispersion effect in slurry, and insensitivity to sludge. It has a good enrichment effect on low-grade lepidolite ore, and can obtain concentrate products with better technical indicators. It has a good separation effect and small dosage, which significantly improves the recovery rate and grade of lepidolite concentrate products.

[0029] (2) The collector described in this invention is simple to prepare, requires no heating or strong stirring, and has good dispersion effect in flotation slurry.

[0030] (3) When the collector of the present invention is applied to the flotation of low-grade lithium mica ore, the pH of the slurry is 8 to 10, which will not cause corrosion to the equipment. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the process for applying the collector of the present invention to the beneficiation method of low-grade lithium mica ore. Detailed Implementation

[0032] The present invention will be described in detail below with reference to embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0033] Example 1

[0034] In this embodiment, the low-grade lithium mica ore is a low-grade lithium mica ore in Chenzhou City, Hunan Province. The raw ore has a Li2O content of 0.38%, and the main mineral composition is quartz 45.88%, topaz 11.25%, mica 24.61%, kaolinite 8.55%, albite 2.48%, and microcline 7.23%.

[0035] In this embodiment, CFLY-9 is prepared from the following components in the following mass proportions: 19 parts ethylene glycol monomethyl ether, 10 parts butyrylhydrazine, 20 parts oleic acid, 20 parts sodium cocoyl hydroxyethyl sulfonate, 26 parts Tween 80, and 5 parts sodium hydroxide. Butyrylhydrazine is dissolved in ethylene glycol monomethyl ether and then mixed evenly with oleic acid; an emulsifier is added and stirred until it turns milky white; an aqueous solution of sodium cocoyl hydroxyethyl sulfonate and sodium hydroxide is added and stirred evenly, and water is added to prepare a 5% (w / w) aqueous solution.

[0036] The flotation process and reagent regimen in this embodiment are as follows: Figure 1 As shown, the specific steps are as follows:

[0037] S1. Grind the -2mm ore to 75% of the size of -0.074mm to obtain flotation slurry.

[0038] S2. Use hydrocyclones to settle and deslim the slurry, with the desliming yield controlled at around 4% to 6%.

[0039] S3. Pour the deslimed slurry into the flotation cell for flotation operation:

[0040] In the roughing operation, 1000 g / t of sodium carbonate and 200 g / t of sodium hydroxide were added, and the slurry was adjusted for 6 min, with the flotation pH value set to 10. 250 g / t of sodium hexametaphosphate was added and stirred for 3 min. 250 g / t of the flotation collector prepared above was added, and the mixture was stirred for 5 min. After stirring, the mixture was aerated and skimmed, and the flotation time was 2.5 min, yielding roughing concentrate and roughing tailings.

[0041] Scavenging is performed on the roughing tailings. 500 g / t of sodium carbonate is added and stirred for 3 min. 200 g / t of sodium hexametaphosphate is added and stirred for 3 min. 150 g / t of the flotation collector prepared above is added and stirred for 3 min. Then, aeration and skimming are performed for 2 min to obtain scavenging concentrate and final tailings. The scavenging concentrate is returned to the roughing process.

[0042] The rough concentrate was subjected to two cleaning operations. In the first cleaning operation, 100 g / t of sodium hexametaphosphate was added, stirred for 3 min, and floated for 2 min. In the second cleaning operation, 50 g / t of sodium hexametaphosphate was added, stirred for 3 min, and floated for 2 min to obtain lepidolite concentrate. The middlings from the cleaning operation were returned step by step.

[0043] The flotation test results of this embodiment are shown in Table 1. In this embodiment, CFLY-9 was used as the collector for the lepidolite ore, and the obtained lepidolite concentrate had a Li₂O content of 1.57% and a Li₂O recovery rate of 85.11%.

[0044] Table 1. Results of flotation test in Example 1

[0045] product Yield / % <![CDATA[Li2O grade / %]]> <![CDATA[Li2O Recovery Rate / %]]> mud 4.04 0.30 3.18 Concentrate 20.60 1.57 84.94 Tailings 75.36 0.06 11.88 raw ore 100.00 0.38 100.00

[0046] Example 2

[0047] The process flow of this embodiment is the same as that of Embodiment 1. The difference from Embodiment 1 is that in the lithium mica combined collector, glycerol and isooctanol polyoxyethylene polyoxypropylene ether are used as emulsifiers instead of Tween 80, and the mass ratio of emulsifier in the collector remains unchanged.

[0048] The amount of flotation collector used was the same as in Example 1, and the results of the flotation test are shown in Table 2.

[0049] Table 2. Results of flotation test in Example 2

[0050]

[0051] As shown in Table 2, using glycerol or isooctanol polyoxyethylene polyoxypropylene ether as emulsifiers also yielded good flotation indicators. The Li2O grade of the lithium mica concentrate was above 1.5%, and the flotation recovery rate was around 85%. This indicates that the three emulsifiers, glycerol, isooctanol polyoxyethylene polyoxypropylene ether, and Tween 80, had little impact on the separation effect of the collector.

[0052] Example 3

[0053] The process flow of this embodiment is the same as that of Example 1. The difference is that the distribution ratio of each reagent group in the lepidolite combined collector is changed (the amount of emulsifier is reduced and the ratio of anion and cation collectors is adjusted) to prepare the 1# to 4# combined collectors and explore the flotation effect of the collectors under different reagent group distribution ratios.

[0054] 1# Combined collector: 12 parts ethylene glycol monomethyl ether, 12 parts butyrylhydrazine, 25 parts oleic acid, 25 parts sodium cocoyl hydroxyethyl sulfonate, 20 parts Tween 80, 6 parts sodium hydroxide;

[0055] 2# Combined collector: 17 parts ethylene glycol monomethyl ether, 17 parts butyrylhydrazine, 17 parts oleic acid, 17 parts sodium cocoyl hydroxyethyl sulfonate, 25 parts Tween 80, 6 parts sodium hydroxide;

[0056] 3# Combined collector: 11 parts ethylene glycol monomethyl ether, 10 parts butyrylhydrazine, 27 parts oleic acid, 27 parts sodium cocoyl hydroxyethyl sulfonate, 18 parts Tween 80, and 8 parts sodium hydroxide;

[0057] 4# Combined collector: 11 parts ethylene glycol monomethyl ether, 10 parts butyrylhydrazine, 21 parts oleic acid, 34 parts sodium cocoyl hydroxyethyl sulfonate, 18 parts Tween 80, and 6 parts sodium hydroxide;

[0058] The results of the flotation test are shown in Table 3.

[0059] As shown in Table 3, when using a combination of collectors #1 to #4 for closed-circuit flotation, the Li₂O grade in the lepidolite concentrate is around 1.5%, and the flotation recovery rate is around 85%. The combination of collectors #1 to #4 also achieved good flotation results.

[0060] Table 3. Results of flotation test in Example 3

[0061]

[0062] Comparative Example 1

[0063] This comparative example uses the same flotation process as Example 1, except that the lepidolite collector, by weight, consists of: 24 parts ethylene glycol monomethyl ether, 25 parts oleic acid, 12 parts butyrylhydrazine, 33 parts Tween 80, and 6 parts sodium hydroxide, resulting in a combined collector of CFLY-9A. During the flotation process, the collector dosage for the roughing operation is 250 g / t, and for the scavenging operation, it is 150 g / t. The flotation test results are shown in Figure 4.

[0064] Comparative Example 2

[0065] This comparative example uses the same flotation process as Example 1, except that the lepidolite collector, by weight, consists of: 26 parts ethylene glycol monomethyl ether, 26 parts sodium coconut oil-based hydroxyethyl sulfonate, 13 parts butyrylhydrazine, and 35 parts Tween 80, resulting in a combined collector of CFLY-9B. During the flotation process, the collector dosage for the roughing operation is 250 g / t, and for the scavenging operation, it is 150 g / t. The flotation test results are shown in Table 4.

[0066] Comparative Example 3

[0067] This comparative example uses the same flotation process as Example 1, except that the lepidolite collector, by weight, consists of: 21 parts ethylene glycol monomethyl ether, 23 parts oleic acid, 22 parts sodium coconut oil-based hydroxyethyl sulfonate, 29 parts Tween 80, and 5 parts sodium hydroxide, resulting in a combined collector of CFLY-9C. During the flotation process, the collector dosage for the roughing operation is 250 g / t, and for the scavenging operation, it is 150 g / t. The flotation test results are shown in Table 4.

[0068] Comparative Example 4

[0069] This comparative example uses the same flotation process as Example 1, except that the lepidolite collector, by weight, consists of: 26 parts ethylene glycol monomethyl ether, 13 parts butyrylhydrazine, 27 parts oleic acid, 27 parts sodium cocoyl hydroxyethyl sulfonate, and 7 parts sodium hydroxide, resulting in a combined collector of CFLY-9D. During the flotation process, the collector dosage for the roughing operation is 250 g / t, and for the scavenging operation, it is 150 g / t. The flotation test results are shown in Table 4.

[0070] Comparative Example 5

[0071] This comparative example uses the same flotation process as Example 1, except that the lepidolite collector is prepared by weight as follows: 25 parts ethylene glycol monomethyl ether, 48 parts butyrylhydrazine, and 27 parts Tween 80, resulting in a combined collector of CFLY-9E. This comparative example investigates the effect of the collector on the collection effect after removing sodium cocoyl hydroxyethyl sulfonate, oleic acid, and sodium hydroxide. Therefore, sodium cocoyl hydroxyethyl sulfonate, oleic acid, and sodium hydroxide components were removed in this comparative example. Due to the excessive foaming properties of butyrylhydrazine, a large amount of collector will lead to a harsher flotation environment, higher yield, and increased slime entrainment. When 250 g / t is added in the roughing stage, the concentrate grade and recovery rate are lower than when 100 g / t is added. Therefore, in this comparative example, the collector dosage in the roughing operation is 100 g / t, and the collector dosage in the scavenging operation is 50 g / t. The flotation test results are shown in Table 4.

[0072] Comparative Example 6

[0073] This comparative example uses the same flotation process as Example 1, except that butyrylhydrazine hydrochloride, prepared by butyrylhydrazine and hydrochloric acid, is used as the lepidolite collector. The collector dosage for the roughing operation is 100 g / t, and the collector dosage for the scavenging operation is 50 g / t. The flotation test results are shown in Table 4.

[0074] Comparative Example 7

[0075] This comparative example uses the same flotation process as Example 1, except that sodium oleate, prepared from oleic acid and sodium hydroxide, is used as the lepidolite collector. The collector dosage for the roughing operation is 250 g / t, and the collector dosage for the scavenging operation is 150 g / t. The flotation test results are shown in Table 4.

[0076] Comparative Example 8

[0077] This comparative example uses the same flotation process as Example 1, except that sodium coconut oil-based hydroxyethyl sulfonate is used as the lepidolite collector. The collector dosage for the roughing operation is 250 g / t, and the collector dosage for the scavenging operation is 150 g / t. The flotation test results are shown in Table 4.

[0078] Table 4. Results of flotation tests for Comparative Examples 1 to 8

[0079]

[0080] As shown in Table 4, the flotation test results of Comparative Examples 1 to 5 indicate that, compared with Example 1, when the combined collector lacks sodium cocoyl hydroxyethyl sulfonate (Comparative Example 1), or lacks oleic acid and sodium hydroxide (Comparative Example 2), or lacks butyrylhydrazine (Comparative Example 3), or lacks Tween 80 (Comparative Example 4), or simultaneously lacks sodium cocoyl hydroxyethyl sulfonate, oleic acid, and sodium hydroxide (Comparative Example 5), the Li₂O content in the obtained concentrate is 0.53%–1.42%, and the recovery rate is 8.31%–82.34%, all of which fail to achieve high concentrate indicators. This is due to the synergistic effect between the anionic and cationic collector molecules, the enhancement effect of the organic solvent ethylene glycol monomethyl ether on flotation foam, and the promoting dispersion effect of the emulsifier on the combined collector in the pulp, all of which jointly promote the flotation of lepidolite minerals.

[0081] As shown in Table 4, the flotation test results of Comparative Examples 6 to 8 indicate that by using traditional single anionic collectors such as sodium cocoyl hydroxyethyl sulfonate or sodium oleate, or by using cationic collectors such as butyryl hydrazine instead of the combined collector of this invention, the Li2O content in the obtained concentrate is 0.47% to 0.63%, and the recovery rate is 8.53% to 72.32%. This demonstrates that CFLY-9 of this invention yields better concentrate indicators than the traditional single-component reagents mentioned above as collectors for low-grade lepidolite ore.

[0082] Comparative Example 9

[0083] This comparative example uses the same flotation process and collector as Example 1. The difference is that no inhibitor is added in step S3. The flotation test results are shown in Table 5.

[0084] Table 5. Results of flotation tests for Comparative Example 9

[0085] product Yield / % <![CDATA[Li2O grade / %]]> <![CDATA[Li2O recovery rate / %]]> mud 3.97 0.31 3.22 Concentrate 25.40 1.01 67.18 Tailings 70.63 0.16 29.60 raw ore 100.00 0.38 100.00

[0086] As shown in Table 5, the absence of inhibitors during the flotation process resulted in a significant reduction in both the Li2O grade and recovery rate in the obtained concentrate.

[0087] Comparative Example 10

[0088] This comparative example uses the same flotation process and collector as Example 1. The difference is that no modifier is added in step S3. The flotation test results are shown in Table 6.

[0089] Table 6. Results of flotation tests for Comparative Example 10

[0090] product Yield / % <![CDATA[Li2O grade / %]]> <![CDATA[Li2O recovery rate / %]]> mud 4.01 0.28 2.93 Concentrate 15.24 0.98 39.03 Tailings 80.75 0.275 58.04 raw ore 100.00 0.38 100.00

[0091] As shown in Table 6, without the addition of a modifier during the flotation process, the acidic pulp results in a significant reduction in the Li2O grade and recovery rate of the obtained concentrate.

[0092] Comparative Example 11

[0093] This comparative example uses the same flotation process and collector as Example 1. The difference is that the pH values ​​in step S3 are 5, 8, 10, and 12, respectively. The flotation test results are shown in Table 7.

[0094] Table 7 Results of flotation tests at different pH values

[0095]

[0096] As shown in Table 7, the reagents were more effective when the pulp pH was 8 or 10, resulting in higher recovery and grade of lepidolite concentrate. This indicates that acidic or strongly alkaline conditions would reduce the recovery and grade of lepidolite concentrate.

[0097] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope defined by the appended claims.

Claims

1. A flotation collector for low-grade lepidolite ore, characterized in that, The components include the following parts by weight: The emulsion comprises 10-20 parts of ethylene glycol monomethyl ether, 10-20 parts of butyrylhydrazine, 15-30 parts of fatty acid, 15-35 parts of sodium cocoyl hydroxyethyl sulfonate, 15-30 parts of emulsifier, and 5-10 parts of sodium hydroxide; wherein the emulsifier includes one or more of glycerol, sorbitan monooleate polyoxyethylene ether, and isooctyl polyoxyethylene polyoxypropylene ether.

2. The flotation collector for low-grade lithium mica ore according to claim 1, characterized in that, The fatty acid is oleic acid, and the low-grade lithium mica ore flotation collector comprises the following components in parts by weight: 19 parts ethylene glycol monomethyl ether, 10 parts butyrylhydrazine, 20 parts oleic acid, 20 parts sodium cocoyl hydroxyethyl sulfonate, 26 parts emulsifier, and 5 parts sodium hydroxide.

3. The method for preparing the flotation collector for low-grade lithium mica ore according to any one of claims 1-2, characterized in that, Includes the following steps: Dissolve butyrylhydrazine in ethylene glycol monomethyl ether and mix it evenly with fatty acids; add emulsifier and stir until it turns milky white; add an aqueous solution of sodium cocoyl hydroxyethyl sulfonate and sodium hydroxide and stir evenly.

4. The application of the low-grade lepidolite flotation collector according to any one of claims 1-2 in lepidolite flotation, characterized in that, Includes the following steps: S1. Grind the raw lepidolite ore to obtain flotation slurry; S2. Use sedimentation desliming or chemical desliming methods to remove some of the slurry mud; S3. Add flotation modifier to the deslimed slurry to adjust the pH value of the slurry, add inhibitor and collector, stir thoroughly, and then perform aeration flotation to obtain lepidolite concentrate.

5. The application according to claim 4, characterized in that, The pH value in step S3 is 8~10.

6. The application according to claim 4, characterized in that, The flotation operation in step S3 includes coarse flotation, fine flotation, and sweep flotation, wherein the fine flotation includes fine flotation I and fine flotation II.

7. The application according to claim 6, characterized in that, The modifiers are sodium carbonate and sodium hydroxide. In the roughing operation, the dosage of sodium carbonate and sodium hydroxide is 800~1200g / t and 100~300g / t, respectively. In the scavenging operation, the dosage of sodium carbonate is 400~800g / t.

8. The application according to claim 6, characterized in that, The inhibitor is sodium hexametaphosphate. The amount of sodium hexametaphosphate used in the selective process is 50~150g / t, and the amount of sodium hexametaphosphate used in the scavenging process is 100~300g / t.

9. The application according to claim 6, characterized in that, The amount of collector added in the roughing operation is 200~300g / t, and the amount of collector added in the scavenging operation is 100~200g / t.

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