Column-machine combined efficient spodumene flotation method

Abstract

The invention discloses a column-machine combined efficient spodumene flotation method, which comprises the following steps of: after carrying out ore grinding, flotation desliming and size mixing treatment on raw spodumene ore, putting the raw spodumene ore into a flotation machine, and carrying out rapid flotation under the action of a regulator, sodium hydroxide, an activating agent and a collecting agent A to obtain flotation concentrate I and flotation tailings I; and the flotation tailings I are put into the flotation machine again, flotation column flotation is conducted under the action of the adjusting agent and the flotation column containing the collecting agent B, and flotation concentrate II and flotation tailings II are obtained. By optimizing the flotation process and combining the advantages of mechanical flotation equipment and a flotation column, the recovery rate and the concentrate grade of spodumene are effectively improved, meanwhile, reagent consumption is remarkably reduced, and reliable technical support is provided for 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] As a key metal element, lithium is widely used in modern technology and energy storage, such as electric vehicles, batteries and renewable energy systems. The unique properties of lithium make it irreplaceable in many high-tech industries, driving the global demand for lithium resources. Spodumene is one of the main lithium ore resources and is widely distributed in many regions around the world. Due to its high lithium content, spodumene has become an important source of lithium extraction and production. At present, the flotation method of spodumene is an important method for enriching lithium ore, which is widely used in industry and related research is also relatively in-depth.

[0003] At present, the flotation method of spodumene mainly separates spodumene from other minerals through collectors. This method relies on the selective adsorption of reagents, but the flotation environment is complex, which easily leads to increased consumption of flotation reagents, and decreased recovery rate and concentrate grade. The above flotation method has many limitations in practical application: the flotation environment is complex, which easily leads to uneven adsorption of reagents, affecting the flotation effect; the reagent consumption increases, and the complex flotation environment increases the ineffective adsorption of reagents, resulting in large reagent consumption and increased production costs; some flotation reagents have a greater impact on the environment, and the collection effect on fine-grained spodumene is not ideal.

[0004] Chinese patent CN109174438 A discloses a spodumene ore dressing and sorting process, which reduces energy consumption by first using a flotation column to pre-float and desludging spodumene, and then using a GF+JJF flotation machine to strongly stir the flotation pulp, strengthen flotation, and use a slag screen+magnetic separation+acid impurity removal process to obtain spodumene concentrate. However, its reagent consumption is large, and it needs to go through a complex and cumbersome impurity removal process to obtain a spodumene concentrate with a grade of 5.5-6.0%. At the same time, the complex and lengthy process will inevitably reduce the yield and recovery rate of the spodumene concentrate, and the acid impurity removal process is not only costly, but also has a greater impact on the environment, increasing the difficulty and cost of environmental protection treatment. In addition, this technical solution fails to fully utilize the technical advantages of flotation columns and flotation machines for mineral particle size, and coarse-grained and fine-grained minerals interfere with each other, and the fine-grained target minerals that have not been recovered are difficult to continue to be recovered in subsequent mechanical flotation. Summary of the invention

[0005] In view of the technical shortcomings of the existing spodumene flotation method, such as uneven reagent adsorption, large reagent consumption, low flotation efficiency, etc., the purpose of the present invention is to provide a column-machine combined high-efficiency flotation method for spodumene. By first adopting mechanical flotation equipment and then combining the advantages of flotation column flotation, the recovery rate and concentrate grade of spodumene can be effectively improved, while optimizing and simplifying the flotation process, reducing reagent consumption, and improving the yield of lithium concentrate, thereby overcoming many limitations of existing flotation technology and providing reliable technical support for the efficient utilization of spodumene ore.

[0006] In order to achieve the above technical purpose, the present invention provides a method for high-efficiency flotation of spodumene by combining a column machine, wherein the spodumene ore is subjected to grinding, flotation desliming and slurry adjustment, and then placed in a flotation machine for rapid flotation under the action of an adjusting 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 placed in a flotation machine again, and is subjected to flotation column flotation under the action of an adjusting 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 -0.074 mm, accounting for 70 to 76%, and then is finely concentrated; the collector A comprises oleic acid, oxidized paraffin soap 731, caustic soda and sodium dodecyl sulfate; the collector B comprises oleic acid, oxidized paraffin soap 731 and caustic soda.

[0007] The key to the technical solution of the present invention is to first use a flotation machine to quickly float the spodumene ore, and then combine it with a flotation column for flotation. The specific principle is that the design of the flotation column allows the bubbles to have a longer residence time in the column, which helps the bubbles to fully contact with the fine mineral particles. The longer residence time can increase the adhesion opportunity of the bubbles, thereby improving the recovery rate of fine-grained minerals. Since the bubble size in the flotation column is uniform and the bubble-mineral contact time is long, this structure can effectively separate fine mineral particles. Compared with traditional mechanical flotation, the flotation column can better handle fine-grained minerals and improve the sorting efficiency. At the same time, the flotation column usually does not require strong stirring like mechanical flotation, which reduces the crushing of mineral particles and the interference of ore pulp, and avoids secondary pollution or misseparation of fine-grained minerals caused by mechanical stirring. The bubble generation, bubble rising speed, and reagent dosage of the flotation column can be adjusted according to the characteristics of the mineral, which makes the flotation column have strong adaptability when processing various fine-grained minerals. Therefore, the present invention fully combines the advantages of mechanical flotation and flotation column for spodumene particle size, firstly adopts mechanical flotation to preferentially select coarse-grained minerals, and then adopts flotation column to treat fine-grained minerals in a targeted manner, thereby 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 flotation column are more targeted, and the reagent can act more effectively on fine-grained spodumene, significantly improving the reagent utilization rate, thereby reducing the 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 at the same time, thereby reducing production costs and negative impacts on the environment.

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

[0009] In addition, the inventors found that if the lithium-containing foam after roughing in the flotation column of the present invention is not regrinded or the particle size of the treatment is not within the scope of the present invention, the grade or recovery rate of the lithium concentrate will be reduced. In spodumene beneficiation, the effect of flotation depends largely on the particle size distribution of mineral particles. If the particles are too coarse, it is difficult for the flotation agent to be fully adsorbed on the mineral surface, resulting in a decrease in the flotation separation efficiency; while too fine particles may increase the agent consumption due to the increase in specific surface area, and the fine mud is easily entrained into the concentrate by bubbles, resulting in a decrease in the concentrate grade. Appropriate particle size refinement can increase the dissociation degree of spodumene and the adsorption effect of the flotation agent, thereby improving the flotation efficiency. If it is not regrinded or the particle size of the treatment is not within the appropriate range, the flotation separation efficiency of spodumene will be reduced, resulting in a decrease in the concentrate grade or recovery rate. Therefore, regrinding is a key step to ensure 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 selection and at least two fine selections; the flotation column flotation includes at least one roughing selection, at least two fine selections and at least two scavenging selections.

[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 dodecyl sulfate 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, 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). In the flotation process of spodumene, the use of different types of collectors in different flotation stages is a selectivity optimization strategy based on the flotation principle. The 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), aiming to quickly float and improve the recovery rate of spodumene. Oleic acid provides excellent selectivity, oxidized paraffin soap enhances the stability and capture ability of bubbles, and SDS further improves the flotation efficiency through its good foaming and capture ability. In the subsequent flotation column concentration stage, the remaining spodumene in the pulp is reduced, and most of it is fine-grained spodumene. Collector B is a combination of oleic acid, oxidized paraffin soap and caustic soda, the main purpose of which is to improve selectivity and improve the grade of spodumene concentrate. The use of SDS is reduced in the concentration stage to avoid excessive recovery of non-target minerals due to excessive foaming, ensuring the high grade of the concentrate. By adjusting the type and proportion of collectors at different stages, the entire flotation process achieves the best balance between recovery rate and concentrate grade, thereby improving the beneficiation efficiency and economic benefits of spodumene.

[0020] As a preferred solution, the adjusting agent is sodium carbonate; the activating agent 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 flotation by 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 the rapid flotation is completed in the stirring tank 1 to obtain the flotation tailings I, and the flotation column flotation is carried out in the stirring tank 2; the flotation tailings II is the final tailings, and the flotation concentrate I and the 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 reagent, especially sodium carbonate, reacts more fully with the mineral. There are usually more silicate minerals (such as quartz, feldspar, etc.) in the spodumene ore, which are easy to weather and produce fine mud. And sufficient stirring to make the mineral and sodium carbonate react can promote the silicate mineral to combine a large number of anions, thereby increasing the negative value of the mineral surface potential, enhancing the electrostatic repulsion between particles, improving the dispersion effect of the mineral, and 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 method for high-efficiency flotation of spodumene by combining a column and a machine, 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 product is subjected to flotation and desliming.

[0028] (3) Rapid flotation: The deslimed pulp is sent to the stirring tank 1, and the adjusting agent sodium carbonate 400-1000g / t, sodium hydroxide 200-800g / t, and activator 100-350g / t are added to the stirring tank 1, and then the collector A 300-800g / t is added to the flotation tank and stirred, and then rapid flotation roughing is carried out in the flotation machine. The rapid flotation roughing foam continues to be blanked twice to obtain spodumene concentrate 1, and the remaining pulp in the tank is subjected to flotation column roughing operation.

[0029] (4) Flotation column roughing: The remaining slurry 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 froth obtained by rough separation in the flotation column: The froth product obtained by rough separation 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 remaining slurry after flotation column selection is sent to the flotation tank for two scavenging. The slurry remaining after scavenging is the flotation tailings.

[0033] Compared with the prior art, the beneficial technical effects of the present invention are:

[0034] 1) The present invention combines the advantages of mechanical flotation equipment and flotation column according to the difference in spodumene particle size, first adopts mechanical flotation and then adopts flotation column, 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 high processing capacity and stirring effect, while the flotation column has a high sorting accuracy and selectivity. By reasonably 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) The present invention significantly reduces the consumption of reagents and prolongs the stirring time by rationally configuring the stirring tank and optimizing the use of adjusting agents, collecting agents and other reagents during the flotation process. In addition, the froth product obtained by roughing the flotation column by regrinding further improves the flotation efficiency, thereby reducing the overall consumption of reagents and reducing 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 process 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, the present invention is further described in detail in conjunction with specific embodiments. However, it should be understood by those skilled in the art that the following description is only intended to illustrate some preferred embodiments of the present invention and should not be regarded as a limitation of 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] The collector A used in the embodiments of the present invention is composed of oleic acid, oxidized paraffin soap 731, caustic soda, and sodium dodecyl sulfate in a mass ratio of 5:3:1:1; the 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) flotation desliming the grinding product, adding 300 g / t of sodium carbonate as a regulator and 50 g / t of oxidized paraffin soap 731 as a collector before desliming;

[0049] (3) The deslimed pulp (pulp concentration is 29%) is sent to the stirring tank 1, and the adjusting agents sodium carbonate 500g / t, sodium hydroxide 200g / t, and calcium chloride 300g / t are added to the stirring tank 1 and stirred for 10 minutes, and then the collector A 600g / t is added to the flotation tank and stirred, and then rapid flotation roughing is carried out in the flotation machine. The rapid flotation roughing foam continues to be blanked twice 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 of step (3) is sent to the stirring tank 2, 500 g / t of sodium carbonate as a regulator is added to the stirring tank 2 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 rough selection in step (4) is regrinded to a particle size of -0.074 mm, accounting for 75.24%.

[0052] (6) The ore pulp after regrinding in step (5) is sent to a flotation column for two blank concentrations 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 in scavenging II is the flotation tailings. Collector B80g / t is added in scavenging I and collector B40g / t is added in scavenging II.

[0054] The test results of the above 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 method for combining column and machine flotation for spodumene is disclosed. Compared with Example 1, the difference is that the comparative example does not use a flotation column for concentration, 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 of Example 1.

[0065] Table 3 Comparative Example 2 Flotation Test Results

[0066]

[0067] Comparative Example 3

[0068] Compared with Example 1, the difference is that in this comparative example, flotation is directly performed without regrinding after roughing in 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 degree 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 when the particle size is too fine 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 regulator and 80 g / t of oxidized paraffin soap as a collector are added;

[0082] (3) The deslimed pulp (pulp concentration of 33%) is sent to the stirring tank 1, and the adjusting agents sodium carbonate 400g / t, sodium hydroxide 300g / t, and calcium chloride 180g / t are added to the stirring tank 1 and stirred for 6 minutes, and then the collector A550g / t is added to the flotation tank and stirred, and then rapid flotation roughing is carried out in the flotation machine. The rapid flotation roughing foam continues to be blanked twice 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 of step (3) is sent to the stirring tank 2, 550 g / t of sodium carbonate as a regulator is added to the stirring tank 2 and stirred for 15 min, and then 450 g / t of collector B is added to the flotation column and rough separation is carried out by flotation column.

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

[0085] (6) The ore pulp after regrinding in step (5) is sent to a flotation column for two blank concentrations 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 in scavenging II is the flotation tailings. Collector B50g / t is added in scavenging I and collector B30g / t is added in scavenging II.

[0087] Specifically, the test results of the above spodumene after being treated by Example 2 of the present invention are shown in Table 6. After 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 roughing, three fines 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 desliming. Then, before roughing, a regulator, specifically 800 g / t of sodium carbonate, 300 g / t of sodium hydroxide and 180 g / t of calcium chloride, was added to perform preliminary spodumene roughing separation. Subsequently, the foam obtained from the roughing was subjected to three blank selections to improve the concentrate purity. The remaining pulp after the roughing was subjected to three scavengings, and 70 g / t, 50 g / t and 30 g / t of collector A were added respectively.

[0092] The experimental results show that although the spodumene concentrate yield 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 Comparative Example 5 Flotation Test Results

[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 after rough selection is ground to -0.074 mm, 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 flotation column flotation and then mechanical flotation. The reagent system is consistent with that in 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 result in 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 dosage 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 dosage 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 will increase, its grade will be greatly reduced.

[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 fully described. Within the scope of the present invention, the reagent formula, mineral processing process and application scenario can be subjected to a variety of simple changes, and these changes are within the scope of protection of the present invention. As long as they conform to the core idea 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 by combining a column machine, characterized in that: The spodumene ore is subjected to grinding, flotation desliming and slurry adjustment, and then put into 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 put into a flotation machine again, and flotation column flotation is carried out 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 rough selection in the flotation column flotation process is re-grinded until the particle size reaches -0.074mm, accounting for 70-76%, and then finely selected; The collector A comprises oleic acid, oxidized paraffin soap 731, caustic soda and sodium dodecyl sulfate; the collector B comprises 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, characterized in that: 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, characterized in that: 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, characterized in that: The collector A is composed of oleic acid, oxidized paraffin soap 731, caustic soda, and sodium dodecyl sulfate 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 comprises 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 rough selection in the flotation column flotation process is: 400-1000g / t of adjusting agent and 300-600g / 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, characterized in that: 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, characterized in that: The stirring time of the adjusting agent, sodium hydroxide, activating agent 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, characterized in that: 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, characterized in that: In the two sweeps of flotation by 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. A 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 the flotation tailings I obtained after the rapid flotation in stirring tank 1 is 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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