A method for high-efficiency flotation of spodumene using a column-machine combination

Abstract

The present invention discloses a method for the efficient flotation of spodumene using a column and flotation machine. The method comprises grinding, flotation desliming, and slurry adjustment of the spodumene ore before placing it in a flotation machine for rapid flotation under the action of a conditioning agent, sodium hydroxide, an activator, and a collector A, thereby obtaining a flotation concentrate I and a flotation tailing I. The flotation tailing I is then placed in a flotation machine again for column flotation under the action of a conditioning agent and a flotation column containing a collector B, thereby obtaining a flotation concentrate II and a flotation tailing II. By optimizing the flotation process and combining the advantages of mechanical flotation equipment with flotation columns, the present invention effectively improves the recovery rate and concentrate grade of spodumene while significantly reducing reagent consumption, thereby providing reliable technical support for the efficient utilization of spodumene ore.

Description

Technical Field

[0001] The invention relates to a column machine combined high-efficiency flotation method for spodumene, belonging to the technical field of mineral flotation. Background Art

[0002] Lithium, a key metallic element, is widely used in modern technology and energy storage, including electric vehicles, batteries, and renewable energy systems. Lithium's unique properties make it irreplaceable in many high-tech industries, driving global demand for lithium resources. Spodumene, a major lithium ore resource, is widely distributed in many regions around the world. Due to its high lithium content, spodumene has become an important source for lithium extraction and production. Currently, spodumene flotation is a key method for enriching lithium ore, widely used in industry and subject to extensive research.

[0003] Currently, spodumene flotation methods primarily use collectors to separate spodumene from other minerals. This method relies on the selective adsorption of the collector, but the complex flotation environment can easily lead to increased flotation reagent consumption, reduced recovery rate and concentrate grade. These flotation methods have many limitations in practical applications: the complex flotation environment can easily lead to uneven reagent adsorption, affecting flotation efficiency; increased reagent consumption, and the complex flotation environment increases ineffective reagent adsorption, resulting in high reagent consumption and increased production costs; some flotation reagents have a significant impact on the environment and are not ideal for collecting fine-grained spodumene.

[0004] Chinese patent CN109174438 A discloses a spodumene ore beneficiation and separation process. This process uses flotation columns to pre-flotate and desludging the spodumene to reduce energy consumption. A GF+JJF flotation machine is then used to vigorously agitate the flotation pulp and enhance flotation. A slag screen, magnetic separation, and acidic impurity removal process are then used to obtain spodumene concentrate. However, this process consumes a large amount of reagents and requires a complex and tedious impurity removal process to obtain a spodumene concentrate with a grade of 5.5-6.0%. Furthermore, the complex and lengthy process inevitably reduces the yield and recovery rate of the spodumene concentrate. Furthermore, the acidic impurity removal process is not only costly but also has a significant impact on the environment, increasing the difficulty and cost of environmental protection treatment. Furthermore, this technical solution fails to fully utilize the technical advantages of flotation columns and flotation machines in terms of mineral particle size. Coarse and fine minerals interfere with each other, making it difficult to recover unrecovered fine minerals in subsequent mechanical flotation. Summary of the Invention

[0005] In response to the technical shortcomings of existing spodumene flotation methods, such as uneven reagent adsorption, high reagent consumption, and low flotation efficiency, the present invention aims to provide a method for the efficient flotation of spodumene using a combination of column and flotation equipment. By first adopting mechanical flotation equipment and then combining it with the advantages of flotation columns, the spodumene recovery rate and concentrate grade can be effectively improved. At the same time, the flotation process is optimized and simplified, reagent consumption is reduced, and the yield of lithium concentrate is increased. Thus, the many limitations of existing flotation technology are overcome, providing reliable technical support for the efficient utilization of spodumene ore.

[0006] In order to achieve the above technical objectives, the present invention provides a method for high-efficiency flotation of spodumene by combining a column machine and a flotation column. The spodumene ore is ground, deslimed by flotation, and slurry-adjusted, and then placed in a flotation machine for rapid flotation under the action of a regulator, sodium hydroxide, an activator, and a collector A to obtain a flotation concentrate I and a flotation tailing I. The flotation tailing I is placed in a flotation machine again and subjected to column flotation under the action of a regulator and a flotation column containing a collector B to obtain a flotation concentrate II and a flotation tailing II. The lithium-containing foam after roughing in the flotation column flotation process is regrinded until the particle size reaches -0.074 mm, accounting for 70-76%, and then subjected to concentrating. The collector A comprises oleic acid, oxidized paraffin soap 731, caustic soda, and sodium dodecylsulfonate; and the collector B comprises oleic acid, oxidized paraffin soap 731, and caustic soda.

[0007] The key to the technical solution of the present invention lies in first using a flotation machine to rapidly flotate the spodumene ore, followed by flotation column flotation. The specific principle is that the design of the flotation column allows bubbles to have a longer residence time within the column, which facilitates sufficient contact between the bubbles and fine mineral particles. The longer residence time increases the chance of bubble adhesion, thereby improving the recovery rate of fine-grained minerals. Because the bubbles in the flotation column are uniform in size and have a longer bubble-mineral contact time, this structure can effectively separate fine mineral particles. Compared to traditional mechanical flotation, the flotation column can better handle fine-grained minerals and improve separation efficiency. Furthermore, the flotation column generally does not require the intense agitation required by mechanical flotation, which reduces mineral particle fragmentation and slurry disturbance, avoiding secondary contamination or misseparation of fine-grained minerals caused by mechanical agitation. The bubble generation, bubble rise rate, and reagent dosage of the flotation column can be adjusted according to the characteristics of the mineral, making the flotation column highly adaptable to various fine-grained minerals. Therefore, the present invention fully combines the advantages of mechanical flotation and flotation column for spodumene particle size, first adopts mechanical flotation to preferentially select coarse-grained minerals, and then adopts flotation column to treat fine-grained minerals in a targeted manner, reducing the burden of flotation column and equipment investment, and its flotation index is more stable and the effect is better. At the same time, the minerals treated by the flotation column are more targeted, and the reagents can act more effectively on fine-grained spodumene, significantly improving the reagent utilization rate, thereby reducing overall reagent consumption and reducing production costs. Therefore, the technical solution of the present invention can effectively reduce the loss rate of spodumene while significantly shortening the process flow, improve the grade and recovery rate of spodumene concentrate, and avoid the acid impurity removal process, thereby reducing production costs and negative impacts on the environment.

[0008] The inventors also found that if flotation column flotation is used first and then mechanical flotation, the flotation column processing capacity will increase, coarse-grained and fine-grained minerals will interfere with each other, and the fine-grained target minerals that are not recovered will be difficult to continue to recover in subsequent mechanical flotation.

[0009] Furthermore, the inventors have discovered that if the lithium-containing foam after roughing in the flotation column of the present invention is not regrinded or the regrinding particle size is outside the scope of the present invention, the lithium concentrate grade or recovery rate will be reduced. In spodumene beneficiation, the flotation effect depends largely on the particle size distribution of the mineral particles. If the particles are too coarse, the flotation agent will not be fully adsorbed on the mineral surface, resulting in a decrease in flotation separation efficiency; while particles that are too fine may increase the agent consumption due to the increased specific surface area, and fine mud can easily be entrained into the concentrate by bubbles, resulting in a decrease in concentrate grade. Appropriate particle size refinement can increase the dissociation degree of spodumene and the adsorption effect of the flotation agent, thereby improving flotation efficiency. If the foam is not regrinded or the regrinding particle size is outside the appropriate range, the flotation separation efficiency of spodumene will be reduced, resulting in a decrease in concentrate grade or recovery rate. Therefore, regrinding is a key step in ensuring efficient flotation separation of spodumene.

[0010] As a preferred solution, the flotation machine is an XFD flotation machine, and the flotation column is an FCSMC type.

[0011] As a preferred solution, the particle size requirement of the grinding is: -0.074mm particle size content is 55-65%;

[0012] As a preferred solution, the slurry is adjusted to a slurry concentration of 25-35%.

[0013] As a preferred solution, the reagent system for flotation desliming is: 200-500 g / t of sodium carbonate as a regulator and 73150-100 g / t of oxidized paraffin soap as a collector.

[0014] As a preferred solution, the rapid flotation includes at least one roughing and at least two cleaning processes; the flotation column flotation includes at least one roughing, at least two cleaning processes and at least two scavenging processes.

[0015] As a preferred solution, the reagent system for roughing in the rapid flotation process is: 400-1000 g / t of adjusting agent, 200-800 g / t of sodium hydroxide, 100-350 g / t of activating agent, and 300-800 g / t of collecting agent A.

[0016] As a preferred solution, the rapid flotation selection and flotation column selection are both blank selection.

[0017] As a preferred solution, the collector A is composed of oleic acid, oxidized paraffin soap 731, caustic soda, and sodium dodecylsulfonate in a mass ratio of (4-6):(2-4):(0.8-1.2):(0.8-1.2).

[0018] As a preferred solution, the reagent system for roughing in the flotation column flotation process is: 400-1000 g / t of adjusting agent and 300-600 g / t of collecting agent B.

[0019] As a preferred solution, Collector B is composed of oleic acid, oxidized paraffin soap 731, and caustic soda in a mass ratio of (2-4):(2-4):(0.8-1.2). In the flotation process of spodumene, the use of different collectors in different flotation stages is a selectivity optimization strategy based on the principles of flotation. Collector A, used in the roughing stage of mechanical flotation, is composed of oleic acid, oxidized paraffin soap 731, caustic soda, and sodium dodecyl sulfate (SDS), designed to achieve rapid flotation and improve spodumene recovery. Oleic acid provides excellent selectivity, oxidized paraffin soap enhances bubble stability and capture capacity, and SDS further enhances flotation efficiency through its excellent foaming and capture capabilities. In the subsequent flotation column concentrating stage, the remaining spodumene in the pulp decreases, with the majority being fine-grained spodumene. Collector B, a combination of oleic acid, oxidized paraffin soap, and caustic soda, is used primarily to improve selectivity and increase the grade of the spodumene concentrate. The use of SDS is reduced during the concentration stage to avoid excessive foaming that could lead to over-recovery of non-target minerals, ensuring a high-grade concentrate. By adjusting the type and ratio of collectors at different stages, the entire flotation process achieves an optimal balance between recovery and concentrate grade, thereby improving the efficiency and economic benefits of spodumene beneficiation.

[0020] As a preferred solution, the regulator is sodium carbonate; the activator is calcium chloride and / or magnesium chloride.

[0021] As a preferred solution, the stirring time of the adjusting agent, sodium hydroxide, activating agent and collector A during the rapid flotation process is 5 to 12 minutes.

[0022] As a preferred solution, the stirring time of the adjusting agent during the flotation process of the flotation column is 10 to 17 minutes.

[0023] As a preferred solution, in the two sweeps of the flotation column, 30-200 g / t of collector B is added in the first sweep, and 20-150 g / t of collector B is added in the second sweep.

[0024] As a preferred solution, the flotation machine has two stirring tanks, wherein rapid flotation is completed in stirring tank 1 to obtain flotation tailings I, which are then subjected to flotation column flotation in stirring tank 2; the flotation tailings II are the final tailings, and the flotation concentrate I and flotation concentrate II are mixed to form the final spodumene concentrate. The present invention is provided with two stirring tanks mainly to ensure that the slurry mixing time is effectively extended under the condition of continuous production, so that the flotation reagents, especially sodium carbonate, react more fully with the minerals. Spodumene ore usually contains a large number of silicate minerals (such as quartz, feldspar, etc.), which are easily weathered to produce fine mud. Sufficient stirring to make the minerals react with sodium carbonate can promote the silicate minerals to bind a large number of anions, thereby increasing the negative value of the mineral surface potential, strengthening the electrostatic repulsion between particles, improving the dispersion effect of the minerals, desorbing the ore mud from the mineral surface, thereby optimizing the slurry environment and improving the effect of spodumene flotation. However, simply increasing the amount of sodium carbonate may interfere with the adsorption of metal activated ions on the spodumene surface, thereby reducing the concentrate recovery rate. At appropriate sodium carbonate concentration, prolonged stirring time contributes to the effective flotation separation and recovery of spodumene.

[0025] The present invention provides a column-machine combined high-efficiency flotation method for spodumene, which specifically comprises the following steps:

[0026] (1) Grinding: Grind the spodumene ore to a particle size of -0.074 mm with a content of 55-65%.

[0027] (2) The grinding products are subjected to flotation and desliming.

[0028] (3) Rapid flotation: The deslimed pulp is fed into agitation tank 1, into which are added 400-1000 g / t of sodium carbonate, 200-800 g / t of sodium hydroxide, and 100-350 g / t of activator. Then, 300-800 g / t of collector A is added to the flotation tank and stirred, followed by rapid flotation roughing in the flotation machine. The rapid flotation roughing foam is then subjected to two blank selections to obtain spodumene concentrate 1. The remaining pulp in the tank is subjected to flotation column roughing.

[0029] (4) Flotation column roughing: The ore pulp remaining in the flotation tank in step (3) is sent to the stirring tank 2, 400-1000 g / t of sodium carbonate as a regulator is added to the stirring tank 2, and then 300-600 g / t of collector B is added to the flotation column for flotation column roughing.

[0030] (5) Regrinding of the foam obtained by rough selection in the flotation column: The foam product obtained by rough selection in the flotation column in step (4) is regrinded to a particle size of -0.074 mm, accounting for 70-76%.

[0031] (6) Flotation column selection: The ore pulp after re-grinding in step (5) is sent to the flotation column for two blank selections to obtain spodumene concentrate II.

[0032] (7) Slurry scavenging in the tank: The slurry remaining after flotation column selection is sent to the flotation tank for two scavengings. The slurry remaining after scavenging is the flotation tailings.

[0033] Compared with the prior art, the present invention has the following beneficial technical effects:

[0034] 1) The present invention combines the advantages of mechanical flotation equipment and flotation columns according to the difference in spodumene particle size, first adopts mechanical flotation and then adopts flotation columns, optimizes the flotation process, significantly shortens the process flow, and significantly improves the recovery rate and concentrate grade of spodumene ore. The flotation tank has a higher processing capacity and stirring effect, while the flotation column has a higher sorting accuracy and selectivity. By rationally configuring the two devices in the flotation process, the recovery rate and concentrate grade of spodumene in the roughing and cleaning processes are optimized, thereby effectively improving the flotation efficiency.

[0035] 2) During the flotation process, the present invention significantly reduces reagent consumption and extends the agitation time by rationally configuring the agitation tank and optimizing the use of regulators, collectors, and other reagents. Furthermore, by regrinding the froth product obtained from the roughing flotation column, flotation efficiency is further improved, thereby reducing overall reagent consumption and lowering production costs.

[0036] 3) The present invention avoids the acidic impurity removal process, thereby reducing production costs and negative impacts on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flow chart of the spodumene column machine combined with high-efficiency flotation process of the present invention.

[0038] Figure 2 This is the flotation process flow chart of Comparative Example 5.

[0039] Figure 3 This is the flotation process flow chart of Comparative Example 7. DETAILED DESCRIPTION

[0040] In order to better understand the technical scheme of the present invention, now in conjunction with specific embodiment, the present invention is described in further detail. However, it should be understood by those skilled in the art that the following description is only for illustrating some preferred embodiments of the present invention and should not be regarded as limiting the present invention. Without departing from the spirit and scope of the present invention, any modification or replacement based on the present invention should be included in the protection scope of the present invention.

[0041] Unless otherwise specified, all reagents and raw materials used in the present invention are commercially available products or products that can be prepared by known methods.

[0042] Collector A used in the embodiments of the present invention is composed of oleic acid, oxidized paraffin soap 731, caustic soda, and sodium lauryl sulfate in a mass ratio of 5:3:1:1; collector B is composed of oleic acid, oxidized paraffin soap, and caustic soda in a mass ratio of 3:3:1.

[0043] The flotation machine used in the embodiments and comparative examples of the present invention is an XFD flotation machine, and the flotation column is an FCSMC flotation column.

[0044] Example 1

[0045] The Li2O content of the spodumene ore in this embodiment is 1.12%

[0046] The specific steps and operating parameters of this embodiment are as follows:

[0047] (1) grinding the spodumene ore to a particle size of -0.074 mm with a content of 60.54%;

[0048] (2) The milled product was subjected to flotation desliming. Before desliming, 300 g / t of sodium carbonate as a conditioning agent and 50 g / t of oxidized paraffin soap 731 as a collector were added;

[0049] (3) The deslimed pulp (pulp concentration of 29%) is fed into agitation tank 1, and adjusting agents such as sodium carbonate 500 g / t, sodium hydroxide 200 g / t, and calcium chloride 300 g / t are added to the agitation tank 1 and stirred for 10 minutes. Then, 600 g / t of collector A is added to the flotation tank and stirred, and then rapid flotation roughing is performed in the flotation machine. The rapid flotation roughing foam is continuously subjected to two blank selections to obtain spodumene concentrate 1, and the remaining pulp in the tank is subjected to flotation column roughing operation;

[0050] (4) The remaining slurry in the flotation tank in step (3) is fed into the second stirring tank, 500 g / t of sodium carbonate as a regulator is added to the stirring tank and stirred for 12 minutes, and then 500 g / t of collector B is added to the flotation column and rough separation is carried out by the flotation column.

[0051] (5) The foam product obtained by the flotation column roughing in step (4) is regrinded to a particle size of -0.074 mm, accounting for 75.24%.

[0052] (6) The ore pulp after re-grinding in step (5) is fed into a flotation column for two blank separations to obtain spodumene concentrate 2. The spodumene concentrate 1 and the spodumene concentrate 2 are mixed to obtain spodumene concentrate.

[0053] (7) The pulp after flotation column selection is sent to the flotation tank for two scavenging. The remaining pulp after scavenging is the flotation tailings. Collector B 80g / t is added in scavenging 1 and collector B 40g / t is added in scavenging 2.

[0054] The test results of the spodumene after being treated by Example 1 of the present invention are shown in Table 1. After adopting this method, a spodumene concentrate with a grade of 5.68% and a recovery rate of 85.19% can be obtained.

[0055] Table 1 Flotation test results of Example 1

[0056]

[0057] Comparative Example 1

[0058] A column-machine combined flotation method for spodumene is described. Compared with Example 1, the difference is that the flotation column is not used for concentration in this comparative example, and other parts remain unchanged. The test results are shown in Table 2.

[0059] The results show that the grade of the spodumene concentrate is lower than that of Example 1.

[0060] Table 2 Flotation test results of Comparative Example 1

[0061]

[0062] Comparative Example 2

[0063] Compared with Example 1, the difference is that no flotation column is used for roughing in this comparative example, and other parts remain unchanged. The test results are shown in Table 3.

[0064] The results show that the recovery rate, grade and yield of the spodumene concentrate are lower than those in Example 1.

[0065] Table 3 Flotation test results of Comparative Example 2

[0066]

[0067] Comparative Example 3

[0068] Compared with Example 1, the difference is that in this comparative example, flotation is performed directly without regrinding after roughing by the flotation column, and other parts remain unchanged. The experimental results are shown in Table 4.

[0069] The results show that without regrinding, the grade and recovery of spodumene concentrate will decrease significantly.

[0070] Table 4 Flotation test results of Comparative Example 3

[0071]

[0072] Comparative Example 4

[0073] Compared with Example 1, the difference is that the stirring time of the reagent in the stirring tank 1 of this comparative example is 2 minutes, and the re-grinding fineness is -0.074mm, accounting for 80%, and the rest remains unchanged. The experimental results are shown in Table 5.

[0074] The results show that, compared with Example 1, shortening the reagent stirring time and excessively fine particle size will reduce the yield and recovery rate of spodumene concentrate.

[0075] Table 5 Flotation test results of Comparative Example 4

[0076]

[0077] Example 2

[0078] The Li2O content of the spodumene ore in this embodiment is 0.97%

[0079] The specific steps and operating parameters of this embodiment are as follows:

[0080] (1) grinding the spodumene ore to a particle size of -0.074 mm with a content of 62.61%;

[0081] (2) The grinding product is subjected to flotation desliming. Before desliming, 350 g / t of sodium carbonate as a conditioning agent and 80 g / t of oxidized paraffin soap as a collector are added;

[0082] (3) The deslimed pulp (pulp concentration of 33%) is fed into agitation tank 1, and adjusting agents such as sodium carbonate 400 g / t, sodium hydroxide 300 g / t, and calcium chloride 180 g / t are added to the agitation tank 1 and stirred for 6 minutes. Then, 550 g / t of collector A is added to the flotation tank and stirred, and then rapid flotation roughing is performed in the flotation machine. The rapid flotation roughing foam is continuously subjected to two blank selections to obtain spodumene concentrate 1, and the remaining pulp in the tank is subjected to flotation column roughing operation;

[0083] (4) The remaining slurry in the flotation tank in step (3) is fed into the second stirring tank, 550 g / t of sodium carbonate as a regulator is added to the second stirring tank, and the mixture is stirred for 15 minutes. Then, 450 g / t of collector B is added to the flotation column, and the flotation column is used for rough separation.

[0084] (5) The foam product obtained by the flotation column roughing in step (4) is regrinded to a particle size of -0.074 mm, accounting for 74.80%.

[0085] (6) The ore pulp after re-grinding in step (5) is fed into a flotation column for two blank separations to obtain spodumene concentrate 2. The spodumene concentrate 1 and the spodumene concentrate 2 are mixed to obtain spodumene concentrate.

[0086] (7) The pulp after flotation column selection is sent to the flotation tank for two scavenging. The remaining pulp after scavenging is the flotation tailings. Collector B 50g / t is added in scavenging 1 and collector B 30g / t is added in scavenging 2.

[0087] Specifically, the test results of the spodumene after being treated according to Example 2 of the present invention are shown in Table 6. By adopting this method, a spodumene concentrate with a Li2O grade of 5.51% and a recovery rate of 80.58% can be obtained.

[0088] Table 6 Flotation test results of Example 2

[0089]

[0090] Comparative Example 5

[0091] In this comparative example, a conventional flotation process of one coarse, three fine and three sweeping flotation machine is adopted, and the grinding fineness is 62.40%. Figure 2 The experimental results are shown in Table 7. First, 350 g / t of sodium carbonate and 80 g / t of oxidized paraffin soap 731 were added for flotation desludging. Adjusters, specifically 800 g / t of sodium carbonate, 300 g / t of sodium hydroxide, and 180 g / t of calcium chloride, were then added before roughing to perform preliminary spodumene roughing separation. Subsequently, the froth obtained from the roughing was subjected to three blank cleanings to improve the concentrate purity. The remaining pulp after the roughing was subjected to three scavengings, with 70 g / t, 50 g / t, and 30 g / t of Collector A added, respectively.

[0092] The experimental results show that although the yield of spodumene concentrate obtained by this process is similar to that of Example 2, its Li2O grade and recovery rate are slightly lower, indicating that although the dosage of reagents in this process is similar to that of Example 2, there is still a certain gap, resulting in the concentrate quality not reaching the optimal level.

[0093] Table 7 Flotation test results of Comparative Example 5

[0094]

[0095] Comparative Example 6

[0096] The process of this comparative example is consistent with that of comparative example 5, except that the foam product is ground to -0.074 mm after roughing, accounting for 74.72%. The experimental results are shown in Table 8.

[0097] Table 8 Flotation test results of Comparative Example 6

[0098]

[0099] Comparative Example 7

[0100] This comparative example adopts the process of first performing flotation column flotation and then mechanical flotation. The reagent system is consistent with that of Example 2. The test process is shown in Figure 3 , the experimental results are shown in Table 9.

[0101] The results show that compared with Example 2, changing the order of mechanical flotation and flotation column flotation will lead to a decrease in the grade and recovery rate of the spodumene concentrate.

[0102] Table 9 Flotation test results of Comparative Example 7

[0103]

[0104] Comparative Example 8

[0105] The process of this comparative example is consistent with that of Example 2, except that collector A is replaced by collector C (collector C is composed of oleic acid, caustic soda, fatty alcohol polyoxyethylene ether, and octanol in a mass ratio of 3:1:1:1), and the amount used is consistent with that of collector A. The experimental results are shown in Table 10.

[0106] The results show that compared with Example 2, replacing the type of collector A will lead to a decrease in the yield and recovery rate of spodumene concentrate.

[0107] Table 10 Flotation test results of Comparative Example 8

[0108]

[0109] Comparative Example 9

[0110] The process of this comparative example is consistent with that of Example 2, except that collector B is replaced by collector D (collector D is composed of oleic acid, cyclohexane acid soap, alkyl carboxyl hydroxamic acid, and caustic soda in a mass ratio of 2:2:1:1), and the amount used is consistent with that of collector B. The experimental results are shown in Table 11.

[0111] The results show that, compared with Example 2, when the type of collector B is changed, although the yield of spodumene concentrate increases, its grade decreases significantly.

[0112] Table 11 Flotation test results of Comparative Example 9

[0113]

[0114] It can be seen from the above examples and comparative examples that, compared with other solutions, the method of the present invention can obtain spodumene concentrate indicators with higher Li2O grade and recovery rate, and the reagent consumption is relatively small.

[0115] The embodiments of the present invention only cover some application scenarios and are not exhaustive. Within the scope of the present invention, the reagent formulations, mineral processing processes, and application scenarios can be subjected to a variety of simple transformations, and these transformations are all within the scope of protection of the present invention. As long as they conform to the core concept of the present invention, these combinations should be included in the disclosure of the present invention.

Claims

1. A method for high-efficiency flotation of spodumene using a column and a flotation machine, characterized in that: The spodumene ore is subjected to grinding, flotation desliming and slurry preparation, and then placed in a flotation machine for rapid flotation under the action of a conditioning agent, sodium hydroxide, an activator and a collector A to obtain a flotation concentrate I and a flotation tailing I; the flotation tailing I is again placed in a flotation machine for column flotation under the action of a conditioning agent and a flotation column containing a collector B to obtain a flotation concentrate II and a flotation tailing II; The lithium-containing foam after roughing in the flotation column flotation process is regrinded until the particle size reaches -0.074mm, accounting for 70-76%, and then fined; The collector A includes oleic acid, oxidized paraffin soap 731, caustic soda and sodium lauryl sulfate; the collector B includes oleic acid, oxidized paraffin soap 731 and caustic soda.

2. The method for high-efficiency flotation of spodumene by combining a column and a machine according to claim 1, wherein: The particle size requirements of the grinding are: -0.074mm particle size content is 55-65%; The slurry is adjusted to a slurry concentration of 25-35%.

3. The method for high-efficiency flotation of spodumene by combining a column and a machine according to claim 1, wherein: The reagent system for roughing in the rapid flotation process is: 400-1000 g / t of adjusting agent, 200-800 g / t of sodium hydroxide, 100-350 g / t of activating agent, and 300-800 g / t of collecting agent A.

4. The method for high-efficiency flotation of spodumene by combining a column and a machine according to claim 3, wherein: The collector A is composed of oleic acid, oxidized paraffin soap 731, caustic soda, and sodium dodecylsulfonate in a mass ratio of (4-6):(2-4):(0.8-1.2):(0.8-1.2).

5. The method for high-efficiency flotation of spodumene by combining a column and a machine according to any one of claims 1 to 4, characterized in that: The rapid flotation includes at least one roughing and at least two cleaning steps; The flotation column flotation includes at least one roughing selection, at least two cleaning selections and at least two scavenging selections; The reagent system for roughing in the flotation column flotation process is: 400-1000 g / t of adjusting agent and 300-600 g / t of collecting agent B.

6. The method for high-efficiency flotation of spodumene by combining a column and a machine according to claim 5, wherein: The collector B is composed of oleic acid, oxidized paraffin soap 731, and caustic soda in a mass ratio of (2-4):(2-4):(0.8-1.2).

7. The method for high-efficiency flotation of spodumene by combining a column and a machine according to claim 1, wherein: The stirring time of the regulator, sodium hydroxide, activator and collector A in the rapid flotation process is 5 to 12 minutes.

8. The method for high-efficiency flotation of spodumene by combining a column and a machine according to claim 7, wherein: The stirring time of the adjusting agent during the flotation column flotation process is 10 to 17 minutes.

9. The method for high-efficiency flotation of spodumene by combining a column and a machine according to claim 1, wherein: In the two sweeps of the flotation column, 30-200 g / t of collector B is added in the first sweep, and 20-150 g / t of collector B is added in the second sweep.

10. The method for high-efficiency flotation of spodumene by combining a column and a machine according to claim 1, 2, 3, 4, 6 or 7, characterized in that: The flotation machine has two stirring tanks, wherein rapid flotation is completed in stirring tank 1 to obtain flotation tailings I, which are then subjected to flotation column flotation in stirring tank 2; The flotation tailings II are the final tailings, and the flotation concentrate I and the flotation concentrate II are mixed to form the final spodumene concentrate.

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