A lithium mica flotation collector and a lithium mica flotation method

Abstract

The application discloses a lithium mica flotation collector, which comprises the following raw materials in mass parts: 15-20 parts of a fatty amine, 4-5 parts of a fatty acid salt, 5-7 parts of a sulfonate, and 3-5 parts of a non-ionic surfactant. The lithium mica flotation collector has the advantages of good selectivity, strong collecting capacity and short defoaming time, can improve the separation effect of lithium mica while reducing the desliming amount, and has the advantages of low cost, simple preparation and important application significance.

Description

Technical Field

[0001] This invention relates to the field of lepidolite flotation technology, and more particularly to a lepidolite flotation collector and a lepidolite flotation method. Background Technology

[0002] The global demand for lithium has surged this century due to the shift from carbon-based fossil fuels to renewable energy, with energy storage and electric vehicles being the most heavily reliant on lithium resources. Common lithium-bearing minerals include spodumene, lepidolite, and petalite. my country has substantial reserves of lepidolite, making it a primary lithium extraction mineral. However, because lepidolite is a silicate mineral with a low LiO2 grade and is typically tightly embedded with other silicate gangues, flotation separation is challenging. The development of highly efficient lepidolite flotation reagents is of significant importance for improving the utilization rate of my country's lithium resources.

[0003] Currently, there are many types of collectors used for lepidolite flotation, including anionic collectors, amine collectors, and novel collectors. Anionic collectors, such as fatty acids, only acquire collecting ability after lepidolite is activated by lithium salts or hydrofluoric acid; while amine collectors have strong collecting ability but lack selectivity and are sensitive to slime, easily adsorbing in large quantities onto the slime surface, which not only increases the amount of collector used and reduces flotation efficiency but also worsens selectivity. The research and testing of novel lepidolite collectors are in their initial stages, and their high cost limits their practical application. Therefore, developing a lepidolite flotation collector that is highly selective, has strong collecting ability, short defoaming time, can improve lepidolite separation while reducing desliming volume, and is also low-cost and easy to prepare is of significant practical importance. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes a lepidolite flotation collector that is easy to prepare, has strong selectivity and foam decomposition ability, and a method for flotation of lepidolite using the lepidolite flotation collector.

[0005] The present invention proposes a lepidolite flotation collector comprising the following raw materials in parts by weight: 15-20 parts of fatty amine, 4-5 parts of fatty acid salt, 5-7 parts of sulfonate, 3-5 parts of nonionic surfactant, and an appropriate amount of anhydrous ethanol.

[0006] Preferably, the fatty amine is at least one of dodecylamine, hexadecylamine, and octadecylamine.

[0007] Preferably, the fatty acid salt is at least one of sodium oleate, sodium linoleate, and sodium linolenate.

[0008] Preferably, the sulfonate is at least one of sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, and sodium petroleum sulfonate.

[0009] Preferably, the nonionic surfactant is composed of dodecylamine polyoxyethylene ether and polyethylene glycol monoethyl ether in a mass ratio of (2-4):1.

[0010] When using the lepidolite flotation collector, it is first dissolved in an appropriate amount of anhydrous ethanol, and then water is added to obtain a 5-10 wt% aqueous solution of the lepidolite flotation collector; preferably, the mass ratio of the lepidolite flotation collector to anhydrous ethanol is 1:1-2:1.

[0011] A method for flotation of lithium mica includes the following steps:

[0012] S1. The lepidolite ore is crushed and ground, then the slime is removed, water is added to adjust the slurry, the inhibitor is added to the slurry and stirred thoroughly, then the lepidolite flotation collector is added and stirred thoroughly, then aeration flotation is performed, the foam is collected, and lepidolite rough concentrate is obtained.

[0013] S2. Add water to the lepidolite rough concentrate to make a slurry, then add the lepidolite flotation collector and stir thoroughly. Then, perform aeration flotation, collect the foam, and obtain lepidolite concentrate.

[0014] Preferably, in S1, the amount of the lepidolite flotation collector is 400-500 g / t.

[0015] Preferably, in S2, the amount of the lepidolite flotation collector is 100-200 g / t.

[0016] Preferably, the inhibitor is sodium hexametaphosphate or water glass.

[0017] Preferably, the amount of the inhibitor is 300-400 g / t.

[0018] Preferably, in S1, an inhibitor is added and stirred for 3-4 minutes.

[0019] Preferably, in step S1, the lepidolite flotation collector is added and stirred for 3-4 minutes.

[0020] Preferably, in step S2, the lepidolite flotation collector is added and stirred for 3-4 minutes.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention employs a mixture of anionic and cationic collectors, which significantly enhances the selectivity and collection ability of the collectors on lepidolite compared to a single collector system. Furthermore, under the action of cationic collectors and nonionic surfactants, the adsorption capacity of fatty acid salts and sulfonate collectors on the lepidolite surface is significantly increased. This may be because after the cationic collector is adsorbed on the lepidolite surface, electrostatic attraction further adsorbs the oppositely charged anionic collectors onto the lepidolite surface, forming alternating or multilayer adsorption. Feldspar and quartz, lacking corresponding collector adsorption sites, prevent the anions from adsorbing onto the lepidolite surface. Further adsorption occurs on the mineral surface, so the amount of collector adsorption does not change significantly, thereby widening the difference in floatability between lepidolite and other silicate gangue minerals and improving the selectivity of the collector. Under the combined action of nonionic surfactants and anions, the sensitivity of amine collectors to slime is significantly improved, making this compound collector applicable to the separation of lepidolite with high slime content, improving the separation efficiency and selectivity of the collector for lepidolite with high slime content. At the same time, the compound collector of this invention also improves the agglomeration ability of flotation foam, thereby significantly improving the separation efficiency of lepidolite.

[0023] In summary, the lepidolite flotation collector of the present invention has the advantages of good selectivity, strong collection ability, and short defoaming time. It can improve the separation effect of lepidolite while reducing the amount of desliming. Moreover, it is low in cost and simple to prepare, and has important application significance. Detailed Implementation

[0024] The technical solution of the present invention will now be described in detail through specific embodiments.

[0025] Example 1

[0026] Preparation of aqueous solution of lepidolite flotation collector:

[0027] 30g dodecylamine, 6g sodium oleate, 9g sodium dodecyl sulfonate and 5g nonionic surfactant were dissolved in 50g anhydrous ethanol, and then water was added to obtain a 5wt% aqueous solution of lepidolite flotation collector. The nonionic surfactant was composed of dodecylamine polyoxyethylene ether and polyethylene glycol monoethyl ether in a mass ratio of 3:1.

[0028] A lepidolite ore sample from Yichun area was used for flotation. The chemical composition of the lepidolite ore is shown in Table 1.

[0029] Table 1

[0030]

[0031] The flotation of the above-mentioned lithium mica ore is carried out using the following method:

[0032] S1. Crush the lepidolite ore and grind it to a fineness of less than 200 mesh (36%). Then remove the slime with a fineness of less than 400 mesh (5%). Add water to adjust the slurry. First, add 300 g / t of sodium hexametaphosphate to the slurry and stir for 3 minutes. Then, add the above-mentioned lepidolite flotation collector aqueous solution according to the dosage of 500 g / t of lepidolite flotation collector. Stir for 4 minutes. Then, perform aeration flotation and collect the foam to obtain lepidolite rough concentrate.

[0033] S2. Add water to the lepidolite rough concentrate to make a slurry, and then add the above-mentioned lepidolite flotation collector aqueous solution at a dosage of 200g / t. Stir for 4 minutes, then aerate for flotation, collect the foam, and obtain lepidolite concentrate.

[0034] After flotation of the Yifeng lithium mica ore using the above-mentioned flotation method, lithium mica concentrate with Li2O grade and recovery rate of 2.21% and 84.55% were finally obtained, with good separation indicators.

[0035] Example 2

[0036] Preparation of aqueous solution of lepidolite flotation collector:

[0037] 30g of hexadecylamine, 6g of sodium linoleate, 9g of sodium dodecylbenzenesulfonate and 5g of nonionic surfactant were dissolved in 50g of anhydrous ethanol, and then water was added to obtain a 5wt% aqueous solution of lepidolite flotation collector. The nonionic surfactant was composed of dodecylamine polyoxyethylene ether and polyethylene glycol monoethyl ether in a mass ratio of 3:1.

[0038] A lepidolite ore sample from Yichun area was used for flotation. The chemical composition of the lepidolite ore is shown in Table 2.

[0039] Table 2

[0040]

[0041] The flotation of the above-mentioned lithium mica ore is carried out using the following method:

[0042] S1. Crush the lepidolite ore and grind it to a fineness of less than 200 mesh (40%). Then remove the slime with a fineness of less than 325 mesh (7%). Add water to adjust the slurry. First, add 300 g / t sodium hexametaphosphate to the slurry and stir for 3 minutes. Then, add the above-mentioned lepidolite flotation collector aqueous solution according to the dosage of 420 g / t of lepidolite flotation collector. Stir for 4 minutes. Then, perform aeration flotation and collect the foam to obtain lepidolite rough concentrate.

[0043] S2. Add water to the lepidolite rough concentrate to make a slurry, and then add the above-mentioned lepidolite flotation collector aqueous solution at a dosage of 150g / t. Stir for 4 minutes, then aerate for flotation, collect the foam, and obtain lepidolite concentrate.

[0044] After flotation of the Yifeng lithium mica ore using the above-mentioned flotation method, lithium mica concentrate with Li2O grade and recovery rate of 2.28% and 83.31% were finally obtained, with good separation indicators.

[0045] Example 3

[0046] Preparation of aqueous solution of lepidolite flotation collector:

[0047] Dissolve 30g dodecylamine, 6g sodium oleate, 9g sodium dodecyl sulfonate and 5g dodecylamine polyoxyethylene ether in 50g anhydrous ethanol, and then add water to obtain a 5wt% aqueous solution of lepidolite flotation collector.

[0048] A lithium mica ore sample from Yichun was used for flotation. The chemical composition of the lithium mica ore is shown in Table 1.

[0049] The flotation of the above-mentioned lithium mica ore is carried out using the following method:

[0050] S1. Crush the lepidolite ore and grind it to a fineness of less than 200 mesh (36%). Then remove the slime with a fineness of less than 400 mesh (5%). Add water to adjust the slurry. First, add 300 g / t of sodium hexametaphosphate to the slurry and stir for 3 minutes. Then, add the above-mentioned lepidolite flotation collector aqueous solution according to the dosage of 500 g / t of lepidolite flotation collector. Stir for 4 minutes. Then, perform aeration flotation and collect the foam to obtain lepidolite rough concentrate.

[0051] S2. Add water to the lepidolite rough concentrate to make a slurry, and then add the above-mentioned lepidolite flotation collector aqueous solution at a dosage of 200g / t. Stir for 4 minutes, then aerate for flotation, collect the foam, and obtain lepidolite concentrate.

[0052] After flotation of the Yifeng lithium mica ore using the above-mentioned flotation method, lithium mica concentrate with Li2O grade and recovery rate of 2.13% and 81.24% were finally obtained, with good separation indicators.

[0053] Example 4

[0054] Preparation of aqueous solution of lepidolite flotation collector:

[0055] Dissolve 30g dodecylamine, 6g sodium oleate, 9g sodium dodecyl sulfonate and 5g polyethylene glycol monoethyl ether in 50g anhydrous ethanol, and then add water to obtain a 5wt% aqueous solution of lepidolite flotation collector.

[0056] A lithium mica ore sample from Yichun was used for flotation. The chemical composition of the lithium mica ore is shown in Table 1.

[0057] The flotation of the above-mentioned lithium mica ore is carried out using the following method:

[0058] S1. Crush the lepidolite ore and grind it to a fineness of less than 200 mesh (36%). Then remove the slime with a fineness of less than 400 mesh (5%). Add water to adjust the slurry. First, add 300 g / t of sodium hexametaphosphate to the slurry and stir for 3 minutes. Then, add the above-mentioned lepidolite flotation collector aqueous solution according to the dosage of 500 g / t of lepidolite flotation collector. Stir for 4 minutes. Then, perform aeration flotation and collect the foam to obtain lepidolite rough concentrate.

[0059] S2. Add water to the lepidolite rough concentrate to make a slurry, and then add the above-mentioned lepidolite flotation collector aqueous solution at a dosage of 200g / t. Stir for 4 minutes, then aerate for flotation, collect the foam, and obtain lepidolite concentrate.

[0060] After flotation of the Yifeng lithium mica ore using the above-mentioned flotation method, lithium mica concentrate with Li2O grade and recovery rate of 2.11% and 82.45% were finally obtained, with good separation indicators.

[0061] Example 5

[0062] Preparation of aqueous solution of lepidolite flotation collector:

[0063] 15g dodecylamine, 5g sodium oleate, 5g sodium dodecyl sulfonate and 5g nonionic surfactant were dissolved in 30g anhydrous ethanol, and then water was added to obtain a 5wt% aqueous solution of lepidolite flotation collector. The nonionic surfactant was composed of dodecylamine polyoxyethylene ether and polyethylene glycol monoethyl ether in a mass ratio of 2:1.

[0064] A lithium mica ore sample from Yichun was used for flotation. The chemical composition of the lithium mica ore is shown in Table 3.

[0065] Table 3

[0066]

[0067] The flotation of the above-mentioned lithium mica ore is carried out using the following method:

[0068] S1. Crush the lepidolite ore and grind it to a fineness of less than 200 mesh (42%). Then remove the slime with a fineness of less than 400 mesh (6%). Add water to adjust the slurry. First, add 400 g / t sodium hexametaphosphate to the slurry and stir for 3 minutes. Then, add the above-mentioned lepidolite flotation collector aqueous solution according to the dosage of 500 g / t of lepidolite flotation collector. Stir for 4 minutes. Then, perform aeration flotation and collect the foam to obtain lepidolite rough concentrate.

[0069] S2. Add water to the lepidolite rough concentrate to make a slurry, and then add the above-mentioned lepidolite flotation collector aqueous solution at a dosage of 180g / t. Stir for 4 minutes, then aerate for flotation, collect the foam, and obtain lepidolite concentrate.

[0070] After flotation of the Yifeng lithium mica ore using the above-mentioned flotation method, lithium mica concentrate with Li2O grade and recovery rate of 2.27% and 83.02% were finally obtained, with good separation indicators.

[0071] Comparative Example 1

[0072] The only difference between Comparative Example 1 and Example 1 is the use of a different lithium mica flotation collector, as detailed below:

[0073] Preparation of aqueous solution of lepidolite flotation collector:

[0074] Dissolve 35g dodecylamine, 6g sodium oleate, and 9g sodium dodecyl sulfonate in 50g anhydrous ethanol, and then add water to obtain a 5wt% aqueous solution of lepidolite flotation collector.

[0075] After the Yifeng lithium mica ore was floated using the above flotation method, a lithium mica concentrate with a Li2O grade of 2.02% and a recovery rate of 84.46% was finally obtained, indicating that the presence of nonionic surfactants can improve the concentrate grade to a certain extent, provided that the recovery rate is guaranteed.

[0076] Comparative Example 2

[0077] The only difference between Comparative Example 2 and Example 1 is the use of a different lithium mica flotation collector, as detailed below:

[0078] Preparation of aqueous solution of lepidolite flotation collector:

[0079] 39g of dodecylamine, 6g of sodium oleate, and 5g of nonionic surfactant were dissolved in 50g of anhydrous ethanol, and then water was added to obtain a 5wt% aqueous solution of lepidolite flotation collector. The nonionic surfactant was composed of dodecylamine polyoxyethylene ether and polyethylene glycol monoethyl ether in a mass ratio of 3:1.

[0080] After the Yifeng lithium mica ore was floated using the above flotation method, a lithium mica concentrate with a Li2O grade of 2.04% and a recovery rate of 80.16% was finally obtained. This indicates that the presence of sulfonate anionic collectors can improve the selectivity of compound collectors to a certain extent, thereby increasing the concentrate grade.

[0081] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A lithium mica flotation collector, characterized in that, The raw materials include the following parts by weight: 15-20 parts fatty amine, 4-5 parts fatty acid salt, 5-7 parts sulfonate, and 3-5 parts nonionic surfactant; The fatty acid salt is at least one of sodium oleate, sodium linoleate, and sodium linolenate; The sulfonate is at least one of sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, and sodium petroleum sulfonate; The nonionic surfactant is composed of dodecylamine polyoxyethylene ether and polyethylene glycol monoethyl ether in a mass ratio of (2-4):

1.

2. The lithium mica flotation collector according to claim 1, characterized in that, The fatty amine is at least one of dodecylamine, hexadecamine, and octadecamine.

3. A method for flotation of lithium mica, characterized in that, Includes the following steps: S1. The raw lepidolite is crushed and ground, then the slime is removed, water is added to adjust the slurry, an inhibitor is added to the slurry and stirred thoroughly, then the lepidolite flotation collector described in claim 1 or 2 is added and stirred thoroughly, then aeration flotation is performed, the foam is collected, and lepidolite rough concentrate is obtained. S2. Add water to the lepidolite rough concentrate and stir to adjust the slurry. Then add the lepidolite flotation collector as described in claim 1 or 2 and stir thoroughly. Then, perform aeration flotation, collect the foam, and obtain lepidolite concentrate.

4. The lithium mica flotation method according to claim 3, characterized in that, In S1, the amount of the lepidolite flotation collector is 400-500 g / t.

5. The lithium mica flotation method according to claim 3, characterized in that, In S2, the amount of the lithium mica flotation collector is 100-200 g / t.

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