A multi-element combined collector and its application in low-grade lepidolite flotation

Abstract

The application discloses a kind of multi-element combination collector and its application in low-grade lepidolite flotation, belong to mineral processing technical field.The multi-element combination collector provided by the application is composed of cationic amine collector, anionic promoter and long-chain anionic collector, which significantly improves the reaction activity of the collector and the capture behavior of the mineral particles during the flotation process, reduces the foam viscosity and increases the fluidity, effectively solves the problem of overstable foam and the difficulty of flotation separation of different silicate minerals under acidic conditions, reduces environmental pollution and equipment corrosion, and also strengthens the hydrophobic floating behavior of lepidolite surface, resulting in high grade Li2O concentrate, further realizing the clean recycling of low-grade lepidolite resources.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mineral processing, and particularly relates to a multi-element combined collector and application thereof in low-grade lepidolite flotation. BACKGROUND

[0002] Lepidolite is the second largest lithium ore raw material, and its ideal composition is K(Li, Al)3(Si, Al)4O 10 (F, OH)2, wherein K, Li and Al are easily replaced by Rb, Cs, Fe, Mn and Ti, etc. Due to the common existence of isomorphism of this mineral, it is often associated with minerals such as quartz, feldspar and mica, so the content of Li2O varies greatly, and impurity elements such as Fe, Ti and Mn are many, and the properties of the mineral are complex. Therefore, the lepidolite must be pre-separated and enriched through beneficiation process before being used as a lithium raw material.

[0003] The breakthrough of the flotation technology is the key to realize the comprehensive utilization of low-grade lepidolite resources, especially the improvement of the flotation collector and the production process. At present, the separation of lepidolite is often carried out under acidic conditions with cationic amine collectors, which have strong collecting ability, but are sensitive to fine particles and sludge. The flotation process needs to add a washing and desliming process, and the fine particles of lepidolite are easily lost in the sludge. The strong acid flotation environment is easy to cause serious corrosion to the equipment and the conveying pipeline, and has great safety hidden danger and high wastewater treatment cost. In addition, the freezing point of the amine collector is low, and heating and the introduction of hydrochloric acid or acetic acid are needed when the collector is taken, the amount of water consumed is large to complete the conveying task due to the large amount of foam, the foam stability is firm and not easy to break, and the flowability is poor.

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

[0005] To solve the above technical problems, the application provides a multi-element combined collector and application thereof in low-grade lepidolite flotation.

[0006] To achieve the above purpose, the application provides the following technical solutions:

[0007] The application provides a multi-element combined collector, which comprises a cationic amine collector, an anionic promoter and a long-chain anionic collector; the anionic promoter is one or more of alkyl fatty acid, alkyl fatty acid salt, alkyl sulfate and alkyl sulfonate;

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

[0009] Preferably, the cationic amine collector is a primary amine with the structure R-NH2, wherein R is a C 12 ~C 18 linear or branched hydrocarbon group.

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

[0011] Preferably, the alkyl fatty acid or alkyl fatty acid salt has the structure R-COO - , the alkyl sulfate has the structure R-OSO3 - , and the alkyl sulfonate has the structure R-SO3 - , wherein R is independently selected from C 12 ~C 24 linear or branched hydrocarbon group.

[0012] Preferably, the anionic 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 anionic collector is an alkyl sulfonate; the alkyl sulfonate has the structure R-SO3 - , wherein R is a C 14 ~C 22 linear or branched hydrocarbon group.

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

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

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

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

[0018] (2) performing desliming treatment on the lepidolite ore slurry obtained in step (1) to obtain flotation material and slurry;

[0019] (3) adding the multi-component collector according to any one of claims 1-7 to the flotation material obtained in step (2), and performing flotation after re-slurrying to obtain a lithium concentrate and a flotation tailing.

[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-component combination of collectors, which significantly improves the reactivity 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 cationic amine collectors and anionic organic reagents, reducing the electrostatic repulsion at the solid-liquid-gas interface in the flotation system. At the same time, the repulsive effect between 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, effectively solving the problem of foam overstability.

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

[0026] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0027] Figure 1 This is a process flow chart for the application of the multi-component combination collector provided by the present invention in the flotation of low-grade lepidolite ore. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts 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] An embodiment of the present invention provides a multi-component combined collector, comprising a cationic amine collector, an anion promoter, and a long-chain anion collector.

[0031] The multi-component combination collector proposed by the present invention has the advantages of: firstly, utilizing a positively charged cationic amine collector in a solution to be easily adsorbed on a negatively charged lepidolite surface, thereby improving the hydrophobicity of the mineral surface; secondly, utilizing a long-chain anionic collector to be adsorbed in a small amount on a 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 easily associated, the adsorption amount of the main collector on the lepidolite surface is indirectly increased; and thirdly, utilizing a "synergistic effect" generated by the multi-component combination collector, thereby enhancing the reaction activity and the collecting ability of the multi-component combination collector, weakening the repulsive effect between liquid films, and further improving 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 reagent 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, while 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 mineral entrainment is obvious. When the long-chain anionic collector is added, the separation effect of lepidolite and gangue minerals is promoted, and the Li2O grade and recovery rate of the concentrate are improved.

[0033] The present invention uses a cationic amine collector as a main collector, an anionic organic compound as a promoter, and a long-chain anionic organic compound as an auxiliary collector, and prepares a combined collector in a certain mass ratio. The combined collector strengthens the flotation separation of low-grade lepidolite and gangue minerals under near-neutral conditions, improves the viscosity and fluidity of the flotation foam, and further realizes the recovery and utilization of low-grade lithium ore resources.

[0034] In a preferred embodiment, the cationic amine collector is a primary amine with the structural formula R-NH2, wherein R is C 12 ~C 18 The cationic amine collector primary amine in the present invention has a certain foaming ability and a strong foam stability. After hydrolysis, it mainly forms 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 The anionic 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 anionic promoter is one or more of sodium lauryl sulfonate, sodium lauryl 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-regions on the surface of lepidolite. When used in combination with cationic amine collectors and anionic promoters, it effectively enhances the capture ability and selectivity of the collector, thereby strengthening the flotation recovery of lepidolite.

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

[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 slurrying the lepidolite ore to obtain lepidolite raw ore slurry;

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

[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 the preferred embodiments, in step (1), the grinding concentration of the grinding is 50-67%, and the fineness of the obtained slurry after grinding is 40-70% of -200 mesh.

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

[0047] In some preferred embodiments, the desliming treatment is carried out for 1-3 times, more preferably 3 times.

[0048] In the preferred embodiments, in step (3), the adding amount of the multi-component combined collector is 125-1080 g / t.

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

[0050] Unless otherwise specified, the raw materials in the examples and comparative examples of the present application are purchased through the market channel.

[0051] In the following examples and comparative examples, the flotation environment is natural pH, and the pH value of the solution of the flotation slurry is measured to be 8.0±0.4 after adding all the reagents.

[0052] Examples 1-3

[0053] The multi-component combined 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 the multi-component combined collector in the flotation of low-grade lepidolite, the process flow is shown in Figure 1 , and the specific operation steps are as follows:

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

[0056] (2) The lepidolite raw slurry obtained in step (1) is subjected to screening desliming to obtain flotation material and slurry; wherein the screening desliming particle size is -600 mesh, the screen 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 lepidolite ore (raw ore), and stirred for 4 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lepidolite is scraped out with the foam to become a concentrate, and the unfloated product is a tailing.

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

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

[0060]

[0061] As shown in Table 1, when the dosage of oxidized paraffin soap is 25-75 g / t, and a multi-component collector consisting of dodecylamine, oxidized paraffin soap and sodium petroleum sulfonate is used to float lepidolite, the Li2O grade of the obtained lithium concentrate is much higher than that of the original ore.

[0062] Examples 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 lepidolite 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 lepidolite ore (ore), 120 g / t of dodecylamine, 120 g / t of anionic promoter (the anionic promoters are sodium dodecyl sulfate, sodium oleate, tall oil, and oxidized paraffin soap) and 480 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component 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 lepidolite is scraped out with the foam to become a concentrate, and the unfloated product is a tailing.

[0067] 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 indices of the flotation products were calculated. The results are shown in Table 2.

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

[0069]

[0070]

[0071] As shown in Table 2, a better 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 lepidolite 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, based on each ton of lepidolite ore (ore), 120 g / t of dodecylamine, 120 g / t of anionic promoter (the promoters are sodium dodecyl sulfonate, sodium dodecyl sulfate, and oxidized paraffin soap) and 840 g / t of sodium petroleum sulfonate (i.e., the total amount of the multi-component collector added is 1080 g / t) are added simultaneously, and stirred for 4 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lepidolite is scraped out with the foam to become a concentrate, and the unfloated product is a tailing.

[0077] 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 indices of the flotation products were calculated. The results are shown in Table 3.

[0078] Table 3 Effect of multi-component 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 lepidolite using a multicomponent 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 lepidolite 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, based on each ton of lepidolite ore (ore), 50 g / t of dodecylamine, 50 g / t of anionic promoter (the promoters are sodium dodecylsulfonate, 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 combination collector added is 300 g / t) are added simultaneously, and stirred for 4 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lepidolite is scraped out with the foam to become a concentrate, and the unfloated product is a tailing.

[0086] 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 indices of each flotation product were calculated. The results are shown in Table 4.

[0087] Table 4 Effect of the multi-component collectors in Examples 11-15 on the flotation index of lithium concentrate

[0088]

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

[0090] Example 16

[0091] The multi-component combined collector consists 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 lepidolite 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%. Water was then added to prepare a lithium mica ore slurry with a mass concentration of 28%.

[0094] (2) subjecting the lepidolite ore slurry obtained in step (1) to sedimentation and desliming three times to obtain flotation material and ore slime; wherein, the sedimentation time of the first desliming is 4 minutes, the sedimentation time of the second and third desliming is 3 minutes, 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 dodecylsulfonate and 400 g / t of sodium petroleumsulfonate (i.e., the total amount of the multi-component combination collector added is 600 g / t) are added simultaneously per ton of lepidolite ore (raw ore), and stirred for 4 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lepidolite is scraped out with the foam to become concentrate, and the unfloated product in the flotation tank is tailings.

[0096] 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 indicators of Example 16

[0098] Flotation products Yield (%) <![CDATA[Li2O品位(%)]]> Li2O recovery (%) Mineral mud 16.81 0.471 23.56 concentrate 11.64 1.93 60.41 tailings 69.75 0.0855 16.03 raw ore 100.0 0.372 100.0

[0099] As shown in Table 5, under natural pH conditions, when a multi-component collector composed of dodecylamine, sodium dodecylsulfonate and sodium petroleumsulfonate in a mass ratio of 1:1:4 was added in a total amount of 600 g / t and the sedimentation and desliming times were three times, the flotation of lepidolite obtained better flotation indicators of lithium concentrate.

[0100] Example 17

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

[0102] Application of multi-component combined collector in flotation of low-grade lepidolite 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%. Water was then added to prepare a lithium mica ore slurry with a mass concentration of 28%.

[0104] (2) Screening and desliming the 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 octadecylbenzenesulfonate and 400 g / t of sodium petroleum sulfonate are added simultaneously (i.e., the total amount of the multi-component combination collector added is 600 g / t) per ton of lepidolite ore (raw ore), and stirred for 6 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lepidolite is scraped out with the foam to become concentrate, and the unfloated product in the flotation tank is tailings.

[0106] 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 ore flotation product index in Example 17

[0108] Flotation products Yield (%) <![CDATA[Li2O品位(%)]]> <![CDATA[Li2O回收率(%)]]> Mineral mud 27.35 0.103 18.18 concentrate 5.91 1.41 53.74 tailings 66.74 0.065 28.08 raw ore 100.0 0.155 100.0

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

[0110] Example 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 lepidolite 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%. Water was then added to prepare a lithium mica ore slurry with a mass concentration of 28%.

[0114] (2) Screening and desliming the 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 hexadecylsulfonate and 400 g / t of sodium petroleumsulfonate (i.e., the total amount of the multi-component combination collector added is 600 g / t) are added simultaneously per ton of lepidolite ore (raw ore), and stirred for 6 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lepidolite is scraped out with the foam to become concentrate, and the unfloated product in the flotation tank is tailings.

[0116] 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 (%) Li2O grade (%) Li2O recovery (%) Mineral mud 15.87 0.09 8.11 concentrate 6.48 2.38 85.67 tailings 77.65 0.01 6.22 raw 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 lepidolite using a multi-component collector consisting 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 consists 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 lepidolite 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 hexadecylsulfonate and 400 g / t of sodium petroleumsulfonate (i.e., the total amount of the multi-component combination collector added is 900 g / t) are added simultaneously per ton of lepidolite ore (raw ore), and stirred for 6 minutes; then, aeration flotation is started, and the foam scraping time is 6 minutes. The lepidolite is scraped out with the foam to become concentrate, and the unfloated product in the flotation tank is tailings.

[0125] 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 indicators of lepidolite ore in comparative example 1

[0127] Flotation products Yield (%) <![CDATA[Li2O品位(%)]]> <![CDATA[Li2O回收率(%)]]> Mineral mud 14.07 0.09 6.85 concentrate 24.88 0.61 82.03 tailings 61.05 0.034 11.13 raw ore 100.0 0.185 100.0

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

[0129] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection 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); The cationic amine collector is a primary amine with the structural formula of R-NH2, wherein R is C 12 ~C 18 Straight-chain or branched hydrocarbon group; 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-chain or branched hydrocarbon group; 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-chain or branched hydrocarbon group.

2. The multicomponent combination collector according to claim 1, characterized in that The anion promoter is one or more of sodium lauryl sulfate, sodium lauryl sulfonate, sodium hexadecyl sulfonate, sodium oleate, oxidized paraffin soap and tall oil.

3. The multicomponent combination collector according to claim 1, characterized in that The long-chain anion collector is one or more of sodium petroleum sulfonate and sodium octadecylbenzenesulfonate.

4. The use of the multi-component collector according to any one of claims 1 to 3 in the flotation of low-grade lepidolite, characterized in that: The addition amount of the multi-component combination collector is 125-1080 g / t.

5. The use of the multi-component combination collector according to claim 4 in the flotation of low-grade lepidolite, characterized in that: The following steps are involved: (1) crushing, grinding and slurrying the lepidolite ore to obtain lepidolite raw ore slurry; (2) desludging the lepidolite slurry obtained in step (1) to obtain flotation material and ore slime; (3) adding a multi-component collector to the flotation material obtained in step (2), slurrying the material again, and flotation to obtain lithium concentrate and flotation tailings.

6. The use of the multi-component combination collector according to claim 5 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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