Multi-element combined collecting agent and application thereof in flotation of low-grade lepidolite

Abstract

The invention discloses a multi-element combined collecting agent and application of the multi-element combined collecting agent in low-grade lepidolite flotation, and belongs to the technical field of mineral processing. The multi-element combined collecting agent is composed of the cationic amine collecting agent, the anion accelerant and the long-chain anion collecting agent, the reaction activity of the collecting agent and the capturing behavior on mineral particles are remarkably improved in the flotation process, the foam viscosity is reduced, the fluidity is improved, and the flotation efficiency is improved. The method effectively solves the problems that foam is too stable and different silicate minerals are difficult to float and separate under the acidic condition, reduces environmental pollution and equipment corrosion, further strengthens the hydrophobic floating behavior on the surface of lepidolite, enables the grade of obtained concentrate Li2O to be high, and further realizes clean recycling of low-grade lepidolite resources.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a multi-component combined collector and application thereof in the flotation of low-grade lepidolite. Background Art

[0002] Lepidolite is the second largest raw material for lithium extraction, with an ideal composition of K(Li,Al)3(Si,Al)4O 10 (F,OH)2, in which K, Li and Al are easily replaced by Rb, Cs, Fe, Mn and Ti. Due to the widespread isomorphism of this mineral, it often coexists (or is associated) with minerals such as quartz, feldspar and mica. Therefore, the Li2O content varies greatly, and there are many impurity elements such as Fe, Ti and Mn, and the properties of the minerals are complex. Therefore, lithium mica must be pre-separated and enriched through mineral processing before it can be used as a raw material for lithium extraction.

[0003] The breakthrough of flotation technology is the key to realize the comprehensive utilization of low-grade lithium mica resources, especially the improvement of flotation collectors and production process. At present, lithium mica is often separated and purified under acidic conditions with cationic amine collectors. The collector has a strong collecting capacity, but is sensitive to fine-grained ore mud. The flotation process needs to add a washing and desludging process. Fine lithium mica is easily lost in the ore mud. The strong acid flotation environment is easy to cause serious corrosion to the equipment and transportation pipelines, which poses a great safety hazard and high wastewater treatment costs. In addition, amine collectors have a low freezing point, and need to be heated and hydrochloric acid or acetic acid introduced to assist dissolution when taking the medicine. The amount of flotation foam is large, and the "running trough" phenomenon is serious. The foam is stable and not easy to break and has poor fluidity, resulting in a large amount of water consumption to complete the transportation task.

[0004] Therefore, there is an urgent need for a collector that can enhance the efficient separation of low-grade lepidolite and gangue minerals under near-neutral conditions to solve the above problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a multi-component combined collector and its application in the flotation of low-grade lepidolite.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a multi-component combined collector, comprising a cationic amine collector, an anion promoter and a long-chain anion collector; the anion promoter is one or more of an alkyl fatty acid, an alkyl fatty acid salt, an alkyl sulfate and an alkyl sulfonate;

[0008] The mass ratio of the cationic amine collector, the anion promoter and the long-chain anion collector is 1:(1-3):(3-7).

[0009] Preferably, the cationic amine collector is a primary amine with a structural formula of R-NH2, wherein R is C 12 ~C 18 Straight or branched chain hydrocarbon group.

[0010] Preferably, the primary amine is one or more of dodecylamine and octadecylamine.

[0011] Preferably, the structural formula of the alkyl fatty acid or alkyl fatty acid salt is R-COO - The structural formula of the alkyl sulfate is R-OSO3 - The structural formula of the alkyl sulfonate is R-SO3 - , wherein R is independently selected from C 12 ~C 24 Straight or branched chain hydrocarbon group.

[0012] Preferably, the anion promoter is one or more of sodium dodecyl sulfate, sodium dodecyl sulfonate, sodium hexadecyl sulfonate, sodium oleate, oxidized paraffin soap and tall oil.

[0013] Preferably, the long-chain anion collector is an alkyl sulfonate; the structural formula of the alkyl sulfonate is R-SO3 - , where R is C 14 ~C 22 Straight or branched chain hydrocarbon group.

[0014] Preferably, the long-chain anion collector is one or more of sodium petroleum sulfonate and sodium octadecylbenzene sulfonate.

[0015] The present invention also provides the use of the multi-component combined collector described in the above technical solution in the flotation of low-grade lepidolite ore, wherein the addition amount of the multi-component combined collector is 125-1080 g / t.

[0016] Preferably, the application of the multi-component combined collector in the flotation of low-grade lepidolite comprises the following steps:

[0017] (1) crushing, grinding and slurry mixing the lepidolite ore to obtain the lepidolite raw ore slurry;

[0018] (2) desludging the raw lepidolite slurry obtained in step (1) to obtain flotation material and ore mud;

[0019] (3) Adding the multi-component combination collector according to any one of claims 1 to 7 to the flotation material obtained in step (2), slurrying again and flotation, to obtain lithium concentrate and flotation tailings.

[0020] Preferably, in step (1), the Li2O grade of the lepidolite ore is 0.155-0.372%;

[0021] The grinding concentration of the grinding is 50-67%, and the fineness of the ore pulp obtained after grinding is -200 mesh, accounting for 40-70%.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] (1) The present invention is based on the "synergistic effect" produced by the multi-combination collector, which significantly improves the reaction activity of the lepidolite flotation collector and the capture behavior of mineral particles, and further enhances the separation effect of lepidolite and other minerals.

[0024] (2) The present invention makes full use of the electrostatic attraction between the cationic amine collector and the anionic organic agent to reduce the electrostatic repulsion at the solid-liquid-gas interface in the flotation system. At the same time, the repulsive effect between the liquid membranes is weakened, the transportation speed of water and mineral particles in the Plateau channel is accelerated, the foam viscosity is reduced, and the fluidity is increased, which effectively solves the problem of foam overstability.

[0025] (3) When the multi-component combination collector provided by the present invention is used for the flotation of low-grade lepidolite ore, it has the advantage of being easy to achieve clean and efficient enrichment and recovery of lepidolite in a mild neutral flotation slurry solution, and avoids the problem of poor flotation separation effect between different silicate minerals under acidic conditions, reduces environmental pollution and equipment corrosion, reduces the stability of foam, and simplifies the flotation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 The present invention provides a process flow chart for the application of the multi-component combined collector in the flotation of low-grade lepidolite ore. DETAILED DESCRIPTION

[0028] 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.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The embodiment of the present invention provides a multi-component combined collector, including a cationic amine collector, an anion promoter and a long-chain anion collector.

[0031] The multi-component combined collector proposed by the present invention, firstly, utilizes the fact that the positively charged cationic amine collector in the solution is more easily adsorbed on the negatively charged lepidolite surface, thereby improving the hydrophobicity of the mineral surface; secondly, utilizes the fact that a long-chain anionic collector can be adsorbed in a small amount on the weakly positively charged micro-region on the lepidolite surface, and at the same time, since the long-chain anionic collector and the cationic amine collector are easy to associate, the adsorption amount of the main collector on the lepidolite surface is indirectly increased; thirdly, utilizes the "synergistic effect" generated by the multi-component combined collector, strengthens the reaction activity and the collecting ability of the multi-component combined collector, weakens the repulsive effect between liquid films, and further improves the problem of excessive foam stability.

[0032] In a preferred embodiment, the mass ratio of the cationic amine collector, the anionic promoter and the long-chain anionic collector is 1:(1-3):(3-7). In the present invention, when the cationic amine collector is not added, the combined agent has only a weak collecting effect on lepidolite. When the cationic amine collector is excessive, a large amount of minerals will float non-selectively. When the amount of anionic promoter is small, the mineral flotation recovery rate is low, and when the amount is too high, a large amount of foam is easily generated, the amount of foam is difficult to control, and the gangue minerals are obviously entrained. When the long-chain anionic collector is added, the separation effect of lepidolite and gangue minerals is promoted, and the grade and recovery rate of Li2O in the concentrate are improved.

[0033] The present invention uses cationic amine collectors as main collectors, anionic organic matter as promoters, and long-chain anionic organic matter as auxiliary collectors to prepare a combined collector in a certain mass ratio, thereby strengthening the flotation separation of low-grade lepidolite and gangue minerals under near-neutral conditions, improving the viscosity and fluidity of flotation foam, and further realizing the recovery and utilization of low-grade lithium ore resources.

[0034] In a preferred embodiment, the cationic amine collector is a primary amine with a structural formula of R-NH2, wherein R is C 12 ~C 18 The cationic amine collector primary amine in the present invention has a certain foaming ability, the foam stability is firm, and after hydrolysis, it mainly converts to R-NH3 + The cations are electrostatically adsorbed on the surface of lepidolite, which increases the hydrophobic floating behavior of lepidolite.

[0035] In a preferred embodiment, the primary amine is one or more of dodecylamine and octadecylamine.

[0036] In a preferred embodiment, the anion promoter is one or more of alkyl fatty acids, alkyl fatty acid salts, alkyl sulfates and alkyl sulfonates; the structural formula of the alkyl fatty acid or alkyl fatty acid salt is R-COO - The structural formula of the alkyl sulfate is R-OSO3 - The structural formula of the alkyl sulfonate is R-SO3 - , wherein R is independently selected from C 12 ~C 24 Straight or branched hydrocarbon groups. The anion promoter in the present invention can effectively increase the solubility of the multi-component collector, making it have better foaming ability and the foam is fine and easy to break, effectively reducing the viscosity of the flotation foam.

[0037] In a preferred embodiment, the anion promoter is one or more of sodium dodecyl sulfonate, sodium dodecyl sulfate, sodium oleate, oxidized paraffin soap and tall oil.

[0038] In a preferred embodiment, the long-chain anion collector is an alkyl sulfonate; the structural formula of the alkyl sulfonate is R-SO3 - , where R is C 14 ~C 22 The long-chain anionic collector of the present invention can selectively act on the weakly positively charged micro-region on the surface of lepidolite, and when used in combination with cationic amine collectors and anionic promoters, the capture ability and selectivity of the collector are effectively enhanced, and the flotation recovery of lepidolite is strengthened.

[0039] In a preferred embodiment, the long-chain anion collector is one or more of sodium petroleum sulfonate and sodium octadecylbenzene sulfonate.

[0040] The present invention also provides the use of the multi-component combined collector described in the above technical solution in the flotation of low-grade lepidolite ore, comprising the following steps:

[0041] (1) crushing, grinding and slurry mixing the lepidolite ore to obtain the lepidolite raw ore slurry;

[0042] (2) desludging the raw lepidolite slurry obtained in step (1) to obtain flotation material and ore mud;

[0043] (3) adding the multi-component combined collector described in the above technical solution to the flotation material obtained in step (2), slurrying again and flotation to obtain lithium concentrate and flotation tailings.

[0044] In a preferred embodiment, in step (1), the Li2O grade of the lepidolite ore is 0.155-0.372%.

[0045] In a preferred embodiment, in step (1), the grinding concentration is 50-67%, and the fineness of the ore pulp obtained after grinding is -200 mesh, accounting for 40-70%.

[0046] In a preferred embodiment, in step (2), the desludging rate of the desludging treatment is 15.0-28.0%; the desludging treatment is carried out by screening desludging or sedimentation desludging.

[0047] In some preferred embodiments, the desludging treatment is performed 1 to 3 times, more preferably 3 times.

[0048] In a preferred embodiment, in step (3), the amount of the multi-component collector added is 125 to 1080 g / t.

[0049] In a preferred embodiment, in step (3), the pH value of the solution during the flotation process is 8.0±0.4.

[0050] Unless otherwise specified, the raw materials in the examples and comparative examples of the present invention were purchased from commercial sources.

[0051] In the following examples and comparative examples, the flotation environment was a natural pH, and the pH value of the flotation pulp solution was measured to be 8.0±0.4 after all reagents were added.

[0052] Examples 1-3

[0053] The multi-component collector is composed of dodecylamine, oxidized paraffin soap and sodium petroleum sulfonate in a mass ratio of 1:1:3 (Example 1), 1:2:3 (Example 2) and 1:3:3 (Example 3), respectively.

[0054] Application of multi-component combined collector in flotation of low-grade lithium mica ore, the process flow is shown in Figure 1 , the specific steps are as follows:

[0055] (1) The lithium mica ore with a Li2O grade of 0.20% is crushed to less than 1 mm, and then ground to a fineness of -200 mesh accounting for 60%, and a grinding concentration of 50%, and then water is added to prepare a lithium mica raw ore slurry with a mass concentration of 28%.

[0056] (2) Screening and desliming the raw lepidolite slurry obtained in step (1) to obtain flotation material and ore slime; wherein the particle size of the screening and desliming is -600 mesh, the sieve hole size is 23 μm, and the desliming rate is 15%.

[0057] (3) The flotation material in step (2) is stirred for 2 minutes, and then 25 g / t of dodecylamine, oxidized paraffin soap (in amounts of 25 g / t, 50 g / t, and 75 g / t, respectively) and 75 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component combination collector added is 125 g / t, 150 g / t, and 175 g / t, respectively) are added simultaneously per ton of lithium mica ore (raw ore), and stirred for 4 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lithium mica is scraped out with the foam to become a concentrate, and the unfloated product is a tailing.

[0058] After the concentrates and tailings obtained in Examples 1-3 were filtered, dried and weighed, the concentrates were sampled and tested for element content, and the indicators of each flotation product were calculated. The results are shown in Table 1.

[0059] Table 1 Effect of multi-combination collectors in Examples 1-3 on flotation indexes of lithium concentrate

[0060]

[0061] It can be seen from Table 1 that when the dosage of oxidized paraffin soap is 25-75 g / t, and a multi-combination collector consisting of dodecylamine, oxidized paraffin soap and sodium petroleum sulfonate is used to float lithium mica, the Li2O grade of the obtained lithium concentrate is much higher than that of the original ore.

[0062] Embodiment 4-7

[0063] The multi-component collector is composed of dodecylamine, anionic promoter and sodium petroleum sulfonate in a mass ratio of 1:1:4; the anionic promoters used in Examples 4-7 are sodium dodecyl sulfate, sodium oleate, tall oil and oxidized paraffin soap, respectively.

[0064] Application of multi-component combined collector in flotation of low-grade lithium mica ore, the process flow is shown in Figure 1 , the specific steps are as follows:

[0065] Steps (1)-(2) are the same as in Example 1.

[0066] (3) The flotation material in step (2) is stirred for 2 minutes, and then, based on each ton of lithium mica ore (raw ore), 120 g / t of dodecylamine, 120 g / t of anionic promoter (the anionic promoters are sodium dodecyl sulfate, sodium oleate, tall oil, oxidized paraffin soap) and 480 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component combined collector added is 720 g / t) are added simultaneously, and stirred for 4 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lithium mica is scraped out with the foam to become a concentrate, and the unfloated product is a tailing.

[0067] After the concentrates and tailings obtained in Examples 4-7 were filtered, dried and weighed, the concentrates were sampled and tested for element content, and the indicators of each flotation product were calculated. The results are shown in Table 2.

[0068] Table 2 Effect of multi-combination collectors in Examples 4-7 on flotation indexes of lithium concentrate

[0069]

[0070]

[0071] As shown in Table 2, a good Li2O recovery rate was obtained by flotation of lithium mica using a multi-component collector consisting of dodecylamine, anion promoter and sodium petroleum sulfonate in a mass ratio of 1:1:4.

[0072] Examples 8-10

[0073] The multi-component collector is composed of dodecylamine, anionic promoter and sodium petroleum sulfonate in a mass ratio of 1:1:7; the anionic promoters used in Examples 8-10 are sodium dodecyl sulfonate, sodium dodecyl sulfate and oxidized paraffin soap, respectively.

[0074] Application of multi-component combined collector in flotation of low-grade lithium mica ore, the process flow is shown in Figure 1 , the specific steps are as follows:

[0075] Steps (1)-(2) are the same as in Example 1.

[0076] (3) The flotation material in step (2) is stirred for 2 minutes, and then 120 g / t of dodecylamine, 120 g / t of anionic promoter (the promoters are sodium dodecyl sulfonate, sodium dodecyl sulfate, and oxidized paraffin soap, respectively) and 840 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component combination collector added is 1080 g / t) are added simultaneously per ton of lithium mica ore (raw ore), and stirred for 4 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lithium mica is scraped out with the foam to become a concentrate, and the unfloated product is a tailing.

[0077] After the concentrates and tailings obtained in Examples 8-10 were filtered, dried and weighed, the concentrates were sampled and tested for element content, and the indicators of each flotation product were calculated. The results are shown in Table 3.

[0078] Table 3 Effect of multi-combination collectors in Examples 8-10 on flotation indexes of lithium concentrate

[0079]

[0080] As shown in Table 3, a higher grade of lithium concentrate Li2O was obtained by flotation of lithium mica using a multi-component collector consisting of dodecylamine, anion promoter and sodium petroleum sulfonate in a mass ratio of 1:1:7.

[0081] Examples 11-15

[0082] The multi-component collector is composed of dodecylamine, anionic promoter and sodium petroleum sulfonate in a mass ratio of 1:1:4; the anionic promoters used in Examples 11-15 are sodium dodecyl sulfonate, sodium dodecyl sulfate, oxidized paraffin soap, sodium oleate and tall oil, respectively.

[0083] Application of multi-component combined collector in flotation of low-grade lithium mica ore, the process flow is shown in Figure 1 , the specific steps are as follows:

[0084] Steps (1)-(2) are the same as in Example 1.

[0085] (3) The flotation material in step (2) is stirred for 2 minutes, and then 50 g / t of dodecylamine, 50 g / t of anionic promoter (the promoters are sodium dodecyl sulfonate, sodium dodecyl sulfate, oxidized paraffin soap, sodium oleate, and tall oil) and 200 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component combined collector added is 300 g / t) are added simultaneously per ton of lithium mica ore (raw ore), and stirred for 4 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lithium mica is scraped out with the foam to become a concentrate, and the unfloated product is a tailing.

[0086] After the concentrates and tailings obtained in Examples 11-15 were filtered, dried and weighed, the concentrates were sampled and tested for element content, and the indicators of each flotation product were calculated. The results are shown in Table 4.

[0087] Table 4 Effect of multi-combination collectors in Examples 11-15 on flotation indexes of lithium concentrate

[0088]

[0089] As shown in Table 4, the multi-component combined collector provided by the present invention is applied to the flotation of lithium mica with a lower dosage, and better flotation index of lithium concentrate can be obtained, and both Li2O grade and recovery rate are high.

[0090] Example 16

[0091] The multi-component combined collector is composed of dodecylamine, sodium dodecyl sulfonate and sodium petroleum sulfonate in a mass ratio of 1:1:4.

[0092] Application of multi-component combined collector in flotation of low-grade lithium mica ore, the process flow is shown in Figure 1 , the specific steps are as follows:

[0093] (1) The lithium mica ore with a Li2O grade of 0.372% was crushed to less than 2 mm, and then ground to a fineness of -200 mesh accounting for 40%, and a grinding concentration of 67%, and then water was added to prepare a lithium mica ore slurry with a mass concentration of 28%.

[0094] (2) subjecting the raw lepidolite slurry obtained in step (1) to sedimentation and desliming for three times to obtain flotation material and ore slime; wherein the sedimentation time for the first desliming is 4 min, the sedimentation time for the second and third desliming is 3 min, and the desliming rate is 16.81%.

[0095] (3) The flotation material in step (2) is stirred for 2 minutes, and then 100 g / t of dodecylamine, 100 g / t of sodium dodecyl sulfonate and 400 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component combined collector added is 600 g / t) are added simultaneously per ton of lithium mica ore (raw ore), and stirred for 4 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lithium mica is scraped out with the foam to become a concentrate, and the unfloated product in the flotation tank is a tailing.

[0096] After the concentrate and tailings obtained in Example 16 were filtered, dried and weighed, the concentrate was sampled and tested for element content, and the indicators of each flotation product were calculated. The results are shown in Table 5.

[0097] Table 5 Lepidolite ore flotation product indexes of Example 16

[0098] Flotation products Yield (%) <![CDATA[Li2O grade (%)]]> <![CDATA[Recovery rate of Li2O (%)]]> Mineral mud 16.81 0.471 23.56 Concentrate 11.64 1.93 60.41 Tailings 69.75 0.0855 16.03 Ore 100.0 0.372 100.0

[0099] It can be seen from Table 5 that under natural pH conditions, when a multi-component collector composed of dodecylamine, sodium dodecyl sulfonate and sodium petroleum sulfonate in a mass ratio of 1:1:4 was added in a total amount of 600 g / t and the number of sedimentation and desliming was three times, the flotation of lithium mica obtained better flotation indicators of lithium concentrate.

[0100] Embodiment 17

[0101] The multi-component combined collector is composed of octadecylamine, sodium octadecylbenzene sulfonate and sodium petroleum sulfonate in a mass ratio of 1:1:4.

[0102] Application of multi-component combined collector in flotation of low-grade lithium mica ore, the process flow is shown in Figure 1 , the specific steps are as follows:

[0103] (1) The lithium mica ore with a Li2O grade of 0.155% was crushed to less than 2 mm, and then ground to a fineness of -200 mesh accounting for 70%, and a grinding concentration of 67%, and then water was added to prepare a lithium mica raw ore slurry with a mass concentration of 28%.

[0104] (2) Screening and desliming the raw lepidolite slurry obtained in step (1) to obtain flotation material and ore slime; wherein the particle size of the screening and desliming is -600 mesh, the sieve hole size is 23 μm, and the desliming rate is 27.35%.

[0105] (3) The flotation material in step (2) is stirred for 2 minutes, and then 100 g / t of octadecylamine, 100 g / t of sodium octadecylbenzene sulfonate and 400 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component combined collector added is 600 g / t) are added simultaneously per ton of lithium mica ore (raw ore), and stirred for 6 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lithium mica is scraped out with the foam to become a concentrate, and the unfloated product in the flotation tank is a tailing.

[0106] After the concentrate and tailings obtained in Example 17 were filtered, dried and weighed, the concentrate was sampled and tested for element content, and the indicators of each flotation product were calculated. The results are shown in Table 6.

[0107] Table 6 Lepidolite flotation product index in Example 17

[0108] Flotation products Yield (%) <![CDATA[Li2O grade (%)]]> <![CDATA[Recovery rate of Li2O (%)]]> Mineral mud 27.35 0.103 18.18 Concentrate 5.91 1.41 53.74 Tailings 66.74 0.065 28.08 Ore 100.0 0.155 100.0

[0109] As shown in Table 6, under natural pH conditions, low-grade lepidolite was floated using a combined collector consisting of octadecylamine, sodium octadecylbenzene sulfonate and sodium petroleum sulfonate in a mass ratio of 1:1:4, and Li was well enriched in the concentrate.

[0110] Embodiment 18

[0111] The multi-component combined collector is composed of dodecylamine, sodium hexadecyl sulfonate and sodium petroleum sulfonate in a mass ratio of 1:1:4.

[0112] Application of multi-component combined collector in flotation of low-grade lithium mica ore, the process flow is shown in Figure 1 , the specific steps are as follows:

[0113] (1) The lithium mica ore with a Li2O grade of 0.18% was crushed to less than 2 mm, and then ground to a fineness of -200 mesh accounting for 65%, and a grinding concentration of 50%, and then water was added to prepare a lithium mica ore slurry with a mass concentration of 28%.

[0114] (2) Screening and desliming the raw lepidolite slurry obtained in step (1) to obtain flotation material and ore slime; wherein the particle size of the screening and desliming is -600 mesh, the sieve hole size is 23 μm, and the desliming rate is 15.87%.

[0115] (3) The flotation material in step (2) is stirred for 2 minutes, and then 100 g / t of dodecylamine, 100 g / t of sodium hexadecyl sulfonate and 400 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component combined collector added is 600 g / t) are added simultaneously per ton of lithium mica ore (raw ore), and stirred for 6 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lithium mica is scraped out with the foam to become a concentrate, and the unfloated product in the flotation tank is a tailing.

[0116] After the concentrate and tailings obtained in Example 18 were filtered, dried and weighed, the concentrate was sampled and tested for element content, and the indicators of each flotation product were calculated. The results are shown in Table 7.

[0117] Table 7 Lepidolite flotation product index in Example 18

[0118] Flotation products Yield (%) <![CDATA[Li2O grade (%)]]> <![CDATA[Recovery rate of Li2O (%)]]> Mineral mud 15.87 0.09 8.11 Concentrate 6.48 2.38 85.67 Tailings 77.65 0.01 6.22 Ore 100.0 0.18 100.0

[0119] As shown in Table 7, the lithium concentrate obtained a better Li2O grade and recovery rate by flotation of lithium mica using a multi-component collector composed of dodecylamine, sodium hexadecyl sulfonate and sodium petroleum sulfonate in a mass ratio of 1:1:4.

[0120] Comparative Example 1

[0121] The multi-component combined collector is composed of dodecylamine, sodium hexadecyl sulfonate and sodium petroleum sulfonate in a mass ratio of 4:1:4.

[0122] Application of multi-component combined collector in flotation of low-grade lithium mica ore, the process flow is shown in Figure 1 , the specific steps are as follows:

[0123] Steps (1)-(2) are the same as in Example 18;

[0124] (3) The flotation material in step (2) is stirred for 2 minutes, and then 400 g / t of dodecylamine, 100 g / t of sodium hexadecyl sulfonate and 400 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component combined collector added is 900 g / t) are added simultaneously per ton of lithium mica ore (raw ore), and stirred for 6 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lithium mica is scraped out with the foam to become a concentrate, and the unfloated product in the flotation tank is a tailing.

[0125] After the concentrate and tailings obtained in Comparative Example 1 were filtered, dried and weighed, the concentrate was sampled and tested for element content, and the indicators of each flotation product were calculated. The results are shown in Table 8.

[0126] Table 8 Flotation product index of lithium mica ore in comparative example 1

[0127] Flotation products Yield (%) <![CDATA[Li2O grade (%)]]> <![CDATA[Recovery rate of Li2O (%)]]> Mineral mud 14.07 0.09 6.85 Concentrate 24.88 0.61 82.03 Tailings 61.05 0.034 11.13 Ore 100.0 0.185 100.0

[0128] It can be seen from Table 8 that under natural pH conditions, when a combined collector composed of dodecylamine, sodium hexadecyl sulfonate and sodium petroleum sulfonate in a mass ratio of 4:1:4 is used to float low-grade lithium mica, that is, after increasing the combined proportion of cationic amine collectors, the Li2O grade and recovery rate of the lithium concentrate are reduced. Compared with Example 18, the Li2O grade is reduced by 1.77%, and the Li2O recovery rate is reduced by 3.64%.

[0129] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A multi-component collector, characterized in that: It includes cationic amine collectors, anion promoters and long-chain anion collectors; the anion promoter is one or more of alkyl fatty acids, alkyl fatty acid salts, alkyl sulfates and alkyl sulfonates; The mass ratio of the cationic amine collector, the anion promoter and the long-chain anion collector is 1:(1-3):(3-7).

2. The multi-component combined collector according to claim 1, characterized in that: The cationic amine collector is a primary amine with a structural formula of R-NH2, wherein R is C 12 ~C 18 Straight or branched chain hydrocarbon group.

3. The multi-component combined collector according to claim 2, characterized in that: The primary amine is one or more of dodecylamine and octadecylamine.

4. The multi-component combined collector according to claim 1, characterized in that: The structural formula of the alkyl fatty acid or alkyl fatty acid salt is R-COO - The structural formula of the alkyl sulfate is R-OSO3 - The structural formula of the alkyl sulfonate is R-SO3 - , wherein R is independently selected from C 12 ~C 24 Straight or branched chain hydrocarbon group.

5. The multi-component combined collector according to claim 4, characterized in that: The anion promoter is one or more of sodium dodecyl sulfate, sodium dodecyl sulfonate, sodium hexadecyl sulfonate, sodium oleate, oxidized paraffin soap and tall oil.

6. The multi-component combined collector according to claim 1, characterized in that: The long-chain anion collector is an alkyl sulfonate; the structural formula of the alkyl sulfonate is R-SO3 - , where R is C 14 ~C 22 Straight or branched chain hydrocarbon group.

7. The multi-component collector according to claim 6, characterized in that: The long-chain anion collector is one or more of sodium petroleum sulfonate and sodium octadecylbenzene sulfonate.

8. The use of the multi-component combined collector according to any one of claims 1 to 7 in the flotation of low-grade lepidolite, characterized in that: The added amount of the multi-component combined collector is 125-1080 g / t.

9. The use of the multi-component combined collector according to claim 8 in the flotation of low-grade lepidolite, characterized in that: The following steps are involved: (1) crushing, grinding and slurry mixing the lepidolite ore to obtain the lepidolite raw ore slurry; (2) desludging the raw lepidolite slurry obtained in step (1) to obtain flotation material and ore mud; (3) Adding the multi-component combination collector according to any one of claims 1 to 7 to the flotation material obtained in step (2), slurrying again and flotation, to obtain lithium concentrate and flotation tailings.

10. The use of the multi-component combined collector according to claim 9 in the flotation of low-grade lepidolite, characterized in that: In step (1), the Li2O grade of the lepidolite ore is 0.155-0.372%; The grinding concentration of the grinding is 50-67%, and the fineness of the ore pulp obtained after grinding is -200 mesh, accounting for 40-70%.

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