A method for the integrated recovery of low-lithium resources associated with aluminum-bearing rock formations by cascade positive flotation

Abstract

This invention discloses a tiered positive flotation method for the comprehensive recovery of low-lithium resources associated with aluminum-bearing strata, comprising the following steps: S1, grinding the raw ore to obtain fine material; S2, adding a modifier, inhibitor, and collector 1 to the fine material for aluminum roughing to obtain aluminum rough concentrate and roughing tailings; S3, adding a modifier and inhibitor to the aluminum rough concentrate for aluminum cleaning to obtain aluminum concentrate and aluminum middlings; S4, adding a modifier and collector 2 to the roughing tailings for lithium cleaning to obtain lithium concentrate and final tailings. This invention achieves, for the first time, the comprehensive recovery of low-lithium resources associated with aluminum-bearing strata (aluminum-silicon ratio of approximately 2, Li₂O content of approximately 0.3%), obtaining aluminum concentrate with an aluminum-silicon ratio greater than 7 and lithium concentrate with a Li₂O recovery rate greater than 80%. This invention reduces the amount of material entering subsequent metallurgical lithium extraction processes by more than 40%, thereby significantly reducing metallurgical costs and supporting the goal of economically recovering aluminum and lithium from low-lithium resources associated with aluminum-bearing strata through a combined beneficiation-metallurgical process.

Description

Technical Field

[0001] This invention belongs to the field of comprehensive utilization technology of associated lithium-poor resources in aluminum-bearing rock formations, specifically relating to a cascade positive flotation comprehensive recovery method for associated lithium-poor resources in aluminum-bearing rock formations. Background Technology

[0002] Lithium (Li) is the lightest alkali metal element, known as the "green high-energy metal of the 21st century," and is an important rare metal. With the rapid growth of the new energy industry and the continuous improvement of controlled nuclear fusion research and development technology, the demand for Li mineral resources in China is growing rapidly. However, new clay sedimentary lithium deposits have a relatively small proportion and are still in the research stage, not yet developed and utilized. Therefore, finding new lithium resources has become a top priority.

[0003] In recent years, research on lithium and other rare earth elements (REEs) in bauxite has gradually become a hot topic. By analyzing the Li content of bauxite-bearing rock systems in typical bauxite-bearing areas across China, it was found that the enrichment pattern of Li in the ore-bearing rock systems is roughly the same in each mining area: bauxite > claystone > bauxite. The Wuchuan-Zhengan-Daozhen area in northern Guizhou (referred to as the Wuzhengdao area) contains abundant Li and other REEs associated with bauxite. The average Li content of the bauxite system is 1111.73 g / t, and the Li content of the claystone is 662.01 g / t. These are mainly concentrated in bauxite deposits such as Xinmin, Wafangping, and Dazhuyuan. The lithium-rich layers are not in the bauxite body itself, but rather in the low-grade bauxite at the top and bottom of the ore body. The ore grade is extremely low, the endowment is poor, and the process is complex and difficult. Existing research indicates that Li in bauxite may mainly exist in the form of ion adsorption on the surface of clay minerals and iron-manganese oxides, or enter the crystal lattice of magnesium-iron silicate minerals, clay minerals, and iron-manganese minerals in an isomorphous manner. Compared to traditional lithium resources, extracting lithium from bauxite is energy-intensive, has a low input-output ratio, and requires high energy consumption for enrichment and separation. Therefore, the development and utilization of associated low-lithium resources in bauxite strata is not very high.

[0004] Current research on the beneficiation of aluminous rocks focuses primarily on aluminum recovery, with few reports on the recovery of associated rare earth resources such as lithium. Furthermore, most studies do not address physical beneficiation and enrichment, concentrating instead on metallurgical process technology development. Patent CN103131873B discloses a method for separating lithium from aluminous rocks using mixed acid and preparing lithium carbonate. This method involves leaching lithium from low-grade aluminous rocks containing 30%–50% Al₂O₃ using mixed acid. The method involves mixing 4–8 parts of mixed acid with 1–4 parts of the aluminous rock sample in a 4:1–6:1 ratio, stirring the mixture at 100–120°C for 1–3 hours, filtering while hot after the reaction, and adding Na₂CO₃ to the filtrate to obtain high-purity Li₂CO₃. This invention uses waste low-grade bauxite as raw material to produce metallic lithium, effectively treating previously unusable industrial waste and producing lithium salts, a high-value energy resource. It achieves lithium salt production at a lower cost while solving the problems of waste dumping occupying large amounts of land and polluting the surrounding environment. However, while this patent can produce metallic lithium salts from waste low-grade bauxite, it also has significant drawbacks. The principle of this patent involves adding excess amounts of different dilute acids to react fully with the bauxite, allowing for effective leaching of lithium metal. During the leaching process, the excess dilute acid reacts with lithium to form lithium salts. Finally, a large amount of Na₂CO₃ is added to neutralize the excess dilute acid and then displace the lithium, yielding Li₂CO₃. This patent does not involve physical mineral processing. Metallurgical extraction requires a large amount of acid and a large amount of alkali (Na2CO3 hydrolyzes into a strong alkali) to neutralize the acid. Furthermore, the acid leaching process requires continuous high temperatures to ensure that the difficult-to-react aluminum minerals react effectively, thus guaranteeing the effective leaching of lithium. In addition, the acid leaching process can also cause other metals in the minerals to dissolve, resulting in a high impurity content in the leaching solution, a heavy burden on subsequent purification, and high corrosiveness to equipment, making it difficult to promote and apply in practice.

[0005] In the literature "Lithium Resources in Bauxite (Rock) and Their Development and Utilization Potential," Zhong Hairen pointed out existing methods for utilizing lithium in bauxite (rock), noting that flotation and centrifugal separation combined with conventional acid or alkali treatment methods cannot effectively recover lithium. He also outlined the development of lithium beneficiation from bauxite (rock). Song Yunhua et al. (1987) conducted cation exchange experiments under different media and conditions on bauxite (clay) rocks containing lithium chlorite. The results showed that the lithium leached at room temperature was extremely small, insoluble in hydrochloric acid and dilute sulfuric acid, and did not react with sodium hydroxide solution, only soluble in hot sulfuric acid and hydrofluoric acid. Ren Fangtao et al. (2013), when exploring the separation and enrichment of lithium in bauxite rocks in central Guizhou, used 5%~25% hydrochloric acid at 60℃ for more than 2 hours, obtaining a lithium leaching rate of less than 12%, proving that lithium exists in a small amount in adsorbed form, and is more present in the clay mineral lattice, making leaching and separation at room temperature and acid level unsuitable. After roasting the original sample with a particle size of less than 75 μm at 800℃, the lithium leaching rate reached 95% after reacting with 10% hydrochloric acid (solid-liquid ratio 1:4) at 60℃ for 2 h. Li Ronggai et al. (2014) proposed an experimental method for lithium-bearing alumina (clay) ore in Henan Province, which involved roasting the original ore with a mixture of calcium sulfate, calcium fluoride, and sodium sulfate at 800℃ for 2 h, followed by leaching with sulfuric acid at a solid-liquid ratio of 1:3 at room temperature for 1 h, resulting in a lithium leaching rate of 89% (sulfuric acid concentration 10%) to 95% (sulfuric acid concentration 50%). Wu Lin et al. (2016) treated the sample with hydrofluoric acid (solid-liquid ratio 1:8) at 75℃ and reacted with a stirring intensity of 300 r / min for 15 min when leaching lithium from the Xifeng-Xiuwen aluminous rock, resulting in a lithium leaching rate of 55% (hydrofluoric acid volume fraction 5%) to 99% (hydrofluoric acid volume fraction 17%). The research methods used in the above studies on bauxite (rock) are mainly chemical leaching or roasting-leaching. Chemical leaching alone is not very effective. Although roasting-leaching can achieve a good leaching rate, it has obvious disadvantages such as requiring a large amount of energy, producing a large amount of leaching residue, consuming a large amount of acid, having a high content of impurities in the leaching solution, and causing significant environmental pollution.

[0006] In response to the needs of national energy strategy development and the economic development needs of Guizhou Province, it is necessary to focus on the problems of difficult beneficiation and smelting of low-grade lithium resources associated with bauxite, low comprehensive utilization rate, and low product added value, and to develop advanced technologies and processes to achieve the separation, extraction, and efficient utilization of aluminum and lithium resources. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a tiered positive flotation integrated recovery method for lithium-poor resources associated with aluminum-bearing rock systems. Physical beneficiation alone not only achieves efficient lithium recovery, but also reduces the amount of material entering the subsequent metallurgical lithium extraction process by more than 40%, overcoming the previous technical prejudice that physical beneficiation alone cannot effectively recover lithium from lithium-poor resources associated with aluminum-bearing rock systems.

[0008] The objective of this invention is achieved through the following technical solution: a method for the comprehensive recovery of low-lithium resources associated with aluminum-bearing rock formations via tiered positive flotation, wherein the low-lithium resources in the aluminum-bearing rock formations are clay-type resources with an Al2O3 content of 40-50% and an aluminum-silicon ratio of 1.5-3.0, comprising the following steps:

[0009] S1. Grind the raw ore until the content of -0.074 mm accounts for 80-89% of the mass of the flotation sample to obtain fine material;

[0010] S2. After adding modifier, inhibitor and collector 1 to the fine material in sequence and fully conditioning the slurry, aluminum roughing is carried out to obtain aluminum rough concentrate and roughing tailings.

[0011] S3. After adding modifier and inhibitor to the aluminum rough concentrate in sequence and fully conditioning the slurry, aluminum beneficiation is carried out to obtain aluminum concentrate and aluminum middlings. The aluminum middlings are returned to the previous operation.

[0012] S4. After adding modifier and collector 2 to the roughing tailings in sequence and fully conditioning the slurry, lithium beneficiation is carried out to obtain lithium concentrate and final tailings.

[0013] The modifier is sodium hydroxide and / or sodium carbonate, the inhibitor is sodium fluorosilicate and / or sodium hexametaphosphate, the collector 1 is sodium octadecenoate and / or benzohydroxyxamic acid, and the collector 2 is sodium dodecyl sulfate and / or octadecylamine.

[0014] Furthermore, in step S2, the aluminum roughing is performed at least twice. The roughing tailings obtained from the previous aluminum roughing are used as the feed material for the next aluminum roughing, and the aluminum roughing concentrate obtained from each aluminum roughing is combined as aluminum rough concentrate.

[0015] Furthermore, in step S2, during the first aluminum roughing process, the dosages of the modifier, inhibitor, and collector 1 are 2000-5000 g / t of raw ore, 100-200 g / t of raw ore, and 1000-1500 g / t of raw ore, respectively. During the second and subsequent aluminum roughing processes, the dosages of the modifier, inhibitor, and collector 1 are 500-1000 g / t of raw ore, 20-50 g / t of raw ore, and 200-500 g / t of raw ore, respectively.

[0016] Furthermore, in step S3, the aluminum beneficiation is performed at least twice. The refined concentrate obtained from the previous aluminum beneficiation is used as the flotation material for the next aluminum beneficiation, the aluminum middlings obtained from the first aluminum beneficiation is used as the flotation material for the aluminum roughing process, and the aluminum middlings obtained from other aluminum beneficiations are used as the flotation material for the previous aluminum beneficiation stage.

[0017] Furthermore, in step S3, the dosage of the modifier and the inhibitor during the first aluminum beneficiation is 500-800 g / t of raw ore and 50-80 g / t of raw ore, respectively, and the dosage of the modifier and the inhibitor during each subsequent aluminum beneficiation is 200-400 g / t of raw ore and 20-40 g / t of raw ore, respectively.

[0018] Furthermore, in step S4, the dosage of the lithium refining agent and the collector 2 is 200-400 g / t of raw ore and 25-50 g / t of raw ore, respectively.

[0019] The principle of this invention is as follows: Based on the fundamental characteristics of lithium-poor resources associated with aluminum-bearing rock formations, a selective fragmentation process is employed. After grinding and screening to obtain feed material of suitable particle size, aluminum minerals (gibbsite and gibbsite) are flotated under alkaline media conditions formed by sodium hydroxide and / or sodium carbonate as modifiers. Highly efficient depressants are used to suppress clay minerals such as kaolinite, and highly efficient collectors are selected for flotation recovery of aluminum minerals. Simultaneously, metallic lithium is enriched in the aluminum tailings, improving the feed grade for subsequent lithium beneficiation and upgrading, thus synergistically promoting lithium recovery. The two processes are organically linked. Therefore, this invention replaces the traditional independent recovery process with a stepwise synergistic aluminum-lithium recovery process, achieving for the first time the comprehensive recovery of lithium-poor resources in aluminum-bearing rock formations, with significant results and great potential for widespread application.

[0020] The beneficial effects of this invention are:

[0021] (1) The process of this invention adopts a stepwise positive flotation recovery process for aluminum and lithium minerals, and adds appropriate flotation reagents to achieve comprehensive recovery of lithium-poor resources in aluminum-bearing rock series (aluminum-silicon ratio of about 2 and Li2O content of about 0.3%) for the first time, obtaining aluminum concentrate with an aluminum-silicon ratio greater than 7 (of which the Li2O content is extremely low, below 0.08%) and lithium enrichment with a Li2O recovery rate of greater than 80%, and its Li2O enrichment ratio is greater than 1.5.

[0022] (2) This invention reduces the amount of material entering the subsequent metallurgical lithium extraction process by more than 40%, thereby significantly reducing metallurgical costs and supporting the goal of economically recovering aluminum and lithium from associated lithium-poor resources in aluminum-bearing rock systems through a combined beneficiation-metallurgical process. Attached Figure Description

[0023] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0025] Example 1

[0026] 1. Ore characteristics:

[0027] This is a high-calcium, low-lithium resource in a certain area, consisting of marl. The raw ore contains 0.29% Li₂O, 50.47% Al₂O₃, 28.33% SiO₂, and has an aluminum-silicon ratio of 1.78. The mineral composition is dominated by clay minerals (62.18%) and gibbsite (30.1%), with minor amounts of quartz, hematite, anatase, carbonate minerals, and pyrite. Lithium is primarily found in lithium chlorite.

[0028] 2. Mineral processing technology:

[0029] (1) Grind and screen the raw ore. The material on the screen is returned to the grinding mill, and the material under the screen is qualified fine material.

[0030] (2) After adding appropriate amounts of modifier, inhibitor and collector 1 to the material obtained in step (1) and fully conditioning the slurry, perform the first aluminum roughing to obtain aluminum rough concentrate 1 and roughing I tailings;

[0031] (3) After adding modifier, inhibitor and collector 1 to the roughing I tailings obtained in step (2) and fully conditioning the slurry, a second aluminum roughing is carried out to obtain aluminum rough concentrate 2 and roughing II tailings;

[0032] (4) Combine the aluminum rough concentrate 1 obtained in step (2) and the aluminum rough concentrate 2 obtained in step (3), add the modifier and inhibitor in sequence to fully adjust the slurry, and perform two aluminum cleaning processes to obtain the final aluminum concentrate. Then return the aluminum middlings 1 produced by aluminum cleaning I and the aluminum middlings 2 produced by aluminum cleaning II to the previous flotation operation in sequence.

[0033] (5) Add conditioning agent and collector 2 to the roughing II tailings obtained in step (3) to fully adjust the slurry, and then carry out lithium beneficiation to obtain lithium enrichment and final tailings.

[0034] Preferably, the modifier is sodium hydroxide; the inhibitor is sodium fluorosilicate; the collector 1 is sodium octadecenoate; and the collector 2 is sodium dodecyl sulfate.

[0035] In step (1), the fine material has a particle size of -0.074 mm and accounts for 85% of the mass of the sample entering the flotation.

[0036] In step (2), the amount of the modifier used is 2000 g / t of raw ore based on the mass ratio with the raw ore; the amount of the inhibitor used is 100 g / t of raw ore; and the amount of the collector 1 used is 1000 g / t of raw ore.

[0037] In step (3), the amount of the modifier used is 500 g / t of raw ore, the amount of the inhibitor used is 20 g / t of raw ore, and the amount of collector 1 used is 200 g / t of raw ore, based on the mass ratio to the raw ore.

[0038] In step (4), based on the mass ratio to the raw ore, the amount of aluminum refining agent used in the first aluminum refining process is 500 g / t of raw ore and the amount of inhibitor used is 50 g / t of raw ore; the amount of aluminum refining agent used in the second aluminum refining process is 200 g / t of raw ore and the amount of inhibitor used is 20 g / t of raw ore.

[0039] Preferably, in step (5), the amount of the modifier used is 200 g / t of raw ore based on the mass ratio with the raw ore; and the amount of the collector 2 used is 25 g / t of raw ore.

[0040] 3. Scale indicators for positive flotation:

[0041] The parameters for the tiered positive flotation are shown in Table 1.

[0042] Table 1

[0043]

[0044] Example 2

[0045] 1. Ore characteristics:

[0046] This is a high-calcium, low-lithium resource in a certain area, consisting of marl. The raw ore contains 0.33% Li₂O, 55.09% Al₂O₃, 20.99% SiO₂, and has an aluminum-silicon ratio of 2.62. The mineral composition is mainly clay minerals (55.34%) and gibbsite (35.2%), with minor amounts of quartz, hematite, anatase, carbonate minerals, and pyrite. Lithium is primarily found in lithium chlorite.

[0047] 2. Mineral processing technology:

[0048] (1) Grind and screen the raw ore. The material on the screen is returned to the grinding mill, and the material under the screen is qualified fine material.

[0049] (2) After adding appropriate amounts of modifier, inhibitor and collector 1 to the material obtained in step (1) and fully conditioning the slurry, perform the first aluminum roughing to obtain aluminum rough concentrate 1 and roughing I tailings;

[0050] (3) After adding modifier, inhibitor and collector 1 to the roughing I tailings obtained in step (2) and fully conditioning the slurry, a second aluminum roughing is carried out to obtain aluminum rough concentrate 2 and roughing II tailings;

[0051] (4) Combine the aluminum rough concentrate 1 obtained in step (2) and the aluminum rough concentrate 2 obtained in step (3), add the modifier and inhibitor in sequence to fully adjust the slurry, and perform two aluminum cleaning processes to obtain the final aluminum concentrate. Then return the aluminum middlings 1 produced by aluminum cleaning I and the aluminum middlings 2 produced by aluminum cleaning II to the previous flotation operation in sequence.

[0052] (5) Add conditioning agent and collector 2 to the roughing II tailings obtained in step (3) to fully adjust the slurry, and then carry out lithium beneficiation to obtain lithium enrichment and final tailings.

[0053] Preferably, the modifier is sodium carbonate; the inhibitor is sodium hexametaphosphate; the collector 1 is benzohydroxyoxime acid; and the collector 2 is octadecylamine.

[0054] In step (1), the fine material has a particle size of -0.074 mm and accounts for 89% of the mass of the sample.

[0055] Preferably, in step (2), the amount of the modifier used is 5000 g / t of raw ore, the amount of the inhibitor used is 200 g / t of raw ore, and the amount of the collector 1 used is 1500 g / t of raw ore, based on the mass ratio to the raw ore.

[0056] Preferably, in step (3), the amount of the modifier used is 1000 g / t of raw ore based on the mass ratio with the raw ore; the amount of the inhibitor used is 20-50 g / t of raw ore; and the amount of the collector 1 used is 500 g / t of raw ore.

[0057] Preferably, in step (4), the amount of aluminum refining agent used in the first aluminum refining process is 800 g / t of raw ore and the amount of inhibitor used is 80 g / t of raw ore, based on the mass ratio with the raw ore; the amount of aluminum refining agent used in the second aluminum refining process is 400 g / t of raw ore and the amount of inhibitor used is 40 g / t of raw ore.

[0058] Preferably, in step (5), the amount of the modifier used is 400 g / t of raw ore based on the mass ratio with the raw ore; and the amount of the collector 2 used is 50 g / t of raw ore.

[0059] 3. Scale indicators for positive flotation:

[0060] The parameters for the tiered positive flotation are shown in Table 2.

[0061] Table 2

[0062]

[0063] Comparative Example 1

[0064] Comparative Example 1 uses the same raw ore as Example 1, but removes all aluminum flotation processes from Example 1. Therefore, the process in Example 1 is as follows:

[0065] (1) The raw ore is ground and screened. The material on the screen is returned to the grinding, and the material under the screen is qualified fine material. The particle size of the fine material is -0.074 mm and the content accounts for 85% of the mass of the sample.

[0066] (2) After adding an appropriate amount of modifier and collector 2 to the material obtained in step (1) and fully conditioning the slurry, lithium flotation is carried out directly to obtain lithium concentrate and final tailings. The amount of modifier used is 400 g / t of raw ore and the amount of collector 2 used is 500 g / t of raw ore, based on the mass ratio to the raw ore.

[0067] Flotation parameters are shown in Table 3

[0068] Table 3

[0069]

[0070] Comparative Example 2

[0071] Comparative Example 2 used the same raw ore as Example 1, but the inhibitor in Example 1, sodium fluorosilicate, and collector 1, sodium octadecenoate, were adjusted to: water glass as the inhibitor and oxidized paraffin soap as the collector 1.

[0072] The parameters for tiered positive flotation are shown in Table 4.

[0073] Table 4

[0074]

[0075] Comparative Example 3

[0076] Comparative Example 3 used the same raw ore as Example 1, but the inhibitor in Example 1 was sodium fluorosilicate and the collector 1 was sodium octadecenoate, respectively, were adjusted to: the inhibitor was sodium tripolyphosphate and the collector 1 was styrene-phosphate.

[0077] The parameters for the tiered positive flotation are shown in Table 5.

[0078] Table 5

[0079]

[0080] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A method for the comprehensive recovery of lithium-poor resources associated with aluminum-bearing rock formations via tiered positive flotation, wherein the lithium-poor resources in the aluminum-bearing rock formations are clay-type resources with an Al2O3 content of 40-50% and an aluminum-silicon ratio of 1.5-3.0, characterized in that... It consists of the following steps: S1. Grind the raw ore until the content of -0.074 mm accounts for 80-89% of the mass of the flotation sample to obtain fine material; S2. After adding modifier, inhibitor and collector 1 to the fine material in sequence and fully conditioning the slurry, aluminum roughing is carried out to obtain aluminum rough concentrate and roughing tailings. S3. After adding modifier and inhibitor to the aluminum rough concentrate in sequence and fully conditioning the slurry, aluminum beneficiation is carried out to obtain aluminum concentrate and aluminum middlings. The aluminum middlings are returned to the previous operation. S4. After adding modifier and collector 2 to the roughing tailings in sequence and fully conditioning the slurry, lithium beneficiation is carried out to obtain lithium concentrate and final tailings. The modifier is sodium hydroxide and / or sodium carbonate, the inhibitor is sodium fluorosilicate and / or sodium hexametaphosphate, the collector 1 is sodium octadecenoate and / or benzohydroxyxamic acid, and the collector 2 is sodium dodecyl sulfate and / or octadecylamine.

2. The method for comprehensive recovery of low-lithium resources associated with aluminum-bearing rock formations by cascade positive flotation according to claim 1, characterized in that, In step S2, the aluminum roughing process is performed at least twice. The roughing tailings obtained from the previous aluminum roughing process are used as the feed material for the next aluminum roughing process. The aluminum roughing concentrate obtained from each aluminum roughing process is combined as aluminum rough concentrate.

3. The method for comprehensive recovery of low-lithium resources associated with aluminum-bearing rock formations by cascade positive flotation according to claim 2, characterized in that, In step S2, during the first aluminum roughing process, the dosages of the modifier, inhibitor, and collector 1 are 2000-5000 g / t of raw ore, 100-200 g / t of raw ore, and 1000-1500 g / t of raw ore, respectively. During the second and subsequent aluminum roughing processes, the dosages of the modifier, inhibitor, and collector 1 are 500-1000 g / t of raw ore, 20-50 g / t of raw ore, and 200-500 g / t of raw ore, respectively.

4. The method for comprehensive recovery of low-lithium resources associated with aluminum-bearing rock formations by cascade positive flotation according to claim 1, characterized in that, In step S3, the aluminum beneficiation is performed at least twice. The beneficiated concentrate obtained from the previous aluminum beneficiation is used as the flotation material for the next aluminum beneficiation, the aluminum middlings obtained from the first aluminum beneficiation is used as the flotation material for the aluminum roughing, and the aluminum middlings obtained from other aluminum beneficiations are used as the flotation material for the previous aluminum beneficiation stage.

5. The method for comprehensive recovery of low-lithium resources associated with aluminum-bearing rock formations by cascade positive flotation according to claim 4, characterized in that, In step S3, during the first aluminum beneficiation, the dosage of the modifier and the inhibitor is 500-800 g / t of raw ore and 50-80 g / t of raw ore, respectively. During the second and subsequent aluminum beneficiations, the dosage of the modifier and the inhibitor is 200-400 g / t of raw ore and 20-40 g / t of raw ore, respectively.

6. The method for comprehensive recovery of low-lithium resources associated with aluminum-bearing rock formations by cascade positive flotation according to claim 1, characterized in that, In step S4, the dosage of the lithium refining agent and the collector 2 is 200-400 g / t of raw ore and 25-50 g / t of raw ore, respectively.

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