A lithium mica flotation collector and a beneficiation method

Abstract

The present application provides a collector for spodumene flotation and a beneficiation method, which relates to the technical field of mineral processing. The collector for spodumene flotation in the present application comprises the following raw materials in parts by weight: 4-40 parts of sodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamide, 1-10 parts of ether diamine, 1-10 parts of alkylphenol polyoxyethylene ether, and 1-10 parts of alcohol-based polar organic matter additive. The beneficiation method for spodumene comprises: crushing and grinding the ore containing spodumene, and adding water to make pulp; adding the above-mentioned collector for spodumene flotation to the pulp, and through a flotation process of two rough selections, one scavenging, and two cleanings, a spodumene concentrate is obtained. This collector has few types of reagents, good fluidity of flotation foam, strong adaptability to water quality and slime, stable process, and excellent flotation indexes. It can be used in the beneficiation method for spodumene, without adding regulators and without desliming, improving the grade and recovery rate of spodumene concentrate.

Description

Technical Field

[0001] The present application relates to the technical field of mineral processing, and particularly relates to a flotation collector for lepidolite and a beneficiation method. Background Art

[0002] Lithium is the metal element with the smallest atomic weight, and its element symbol is Li. Lithium is a silver-white metal, soft, with a small density, and has active chemical properties and extremely strong electrochemical activity. It can form alloys or compounds with other elements and is widely used in the fields of new energy, medicine, and new materials, and is recognized as the energy metal of the 21st century.

[0003] The lithium ore resources in China are as follows: 1. Lithium ore in salt lake brine: mainly distributed in high-altitude areas such as Qinghai and Tibet, and recovered by hydrometallurgical processes; 2. Spodumene ore: mainly distributed in the Keketuohai area of Xinjiang and the northwestern part of Sichuan, and recovered by the "three-alkali two-soap flotation process"; 3. Lepidolite ore: mainly distributed in the Yichun area of Jiangxi, and recovered by the "desliming - acid or alkali flotation process". With the rapid development of the new energy industry, the demand for lithium resources has skyrocketed, the price of lithium metal has continued to rise, and the competition for lithium resources among international mining giants and new energy industry chain giants has reached a white-hot level. Medium and low-grade associated fine-grained lepidolite ore has gradually attracted attention.

[0004] However, the traditional "desliming - acid or alkali flotation process" has many defects when treating medium and low-grade associated fine-grained lepidolite ore: First, the desliming operation inevitably causes some fine-grained lepidolite to be lost in the tailings, resulting in resource waste; Second, the acid flotation process requires adjusting the pH value of the pulp to 2 - 4, using cationic amine collectors to float lepidolite. The acidic pulp has high requirements for equipment anti-corrosion, pollutes the environment, has a large foam viscosity and poor fluidity, and affects the concentrate grade; Third, the alkali process requires adding a large amount of inhibitors to inhibit gangue minerals, using a combination of cationic and anionic collectors to float lepidolite. The types of reagents are many and the dosage is large, and it is sensitive to water quality and slime. The concentrate settlement is difficult, and the beneficiation index is less than satisfactory.

[0005] Therefore, developing an efficient flotation collector for lepidolite and a beneficiation process in a neutral pulp environment is of great significance for comprehensively recovering medium and low-grade associated fine-grained lepidolite resources and promoting the sustainable development of the lithium industry in China. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present application is to provide a flotation collector for lepidolite and a beneficiation method, aiming to achieve the full-size selection of medium and low-grade associated lepidolite resources without adding regulators and without desliming, and improve the grade and recovery rate of lepidolite concentrate.

[0007] To achieve the above purpose, the technical solution of the present application is as follows:

[0008] A collector for spodumene flotation, comprising raw materials in the following parts by weight: 4-40 parts of tetrasodium N-octadecyl-N-1,2-dicarboxyethyl sulfonated succinamide, 1-10 parts of ether diamine, 1-10 parts of alkylphenol polyoxyethylene ether, and 1-10 parts of alcohol polar organic matter additive.

[0009] Preferably, the mass ratio of the tetrasodium N-octadecyl-N-1,2-dicarboxyethyl sulfonated succinamide, the ether diamine, the alkylphenol polyoxyethylene ether, and the alcohol polar organic matter additive is (4-6):1:(0.4-0.6):(0.4-0.6).

[0010] Preferably, the alcohol polar organic matter additive is octanol;

[0011] The ether diamine is an ether diamine of C8-C 12 of ether diamine.

[0012] This application also provides a beneficiation method for spodumene, which uses the above-mentioned collector for spodumene flotation.

[0013] Preferably, it includes: crushing and grinding the ore containing spodumene, and adding water to make pulp;

[0014] Adding the collector for spodumene flotation to the pulp, and through a flotation process of two rough selections, one scavenging, and two cleanings, spodumene concentrate is obtained.

[0015] Preferably, the flotation process of the two rough selections includes: adding 100-1000 g / t of the collector for spodumene to the pulp, stirring for 1-3 minutes, and floating for 2-6 minutes to obtain the first rough concentrate and the first rough tailings;

[0016] Adding 50-500 g / t of the collector for spodumene to the first rough tailings, stirring for 1-3 minutes, and floating for 2-6 minutes to obtain the second rough concentrate and the second rough tailings.

[0017] Preferably, the flotation process of the one scavenging includes: adding 25-250 g / t of the collector for spodumene to the second rough tailings obtained from the second rough selection, stirring for 1-3 minutes, and floating for 2-6 minutes to obtain the scavenging concentrate and the scavenging tailings.

[0018] Preferably, the flotation process of the two cleanings includes: after combining the first rough concentrate obtained from the first rough selection and the second rough concentrate obtained from the second rough selection, floating for 2-6 minutes to obtain the first cleaning concentrate and the first cleaning tailings;

[0019] Floating the first cleaning concentrate for 2-6 minutes to obtain the second cleaning concentrate and the second cleaning tailings.

[0020] Preferably, the tailings from the first roughing and the concentrate from the first scavenging are returned to the flotation process for the second roughing.

[0021] Preferably, the tailings from the second cleaning are returned to the flotation process for the first cleaning.

[0022] Preferably, the mass concentration of the pulp made by adding water is 20% - 40%, and the pH is 6 - 8.

[0023] Advantages of this application:

[0024] The lithium mica flotation collector of this application produces a synergistic effect through the rational compounding of sodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamate, ether diamine, alkylphenol polyoxyethylene ether and alcohol polar organic matter additives; and has the characteristics of few reagent types, good fluidity of flotation foam, strong adaptability to water quality and slime, has high selectivity and strong collecting power for medium and low grade associated fine-grained lithium mica, realizes the full-size separation of lithium mica without regulator and desliming operation in a neutral flotation pulp environment, which is conducive to improving the concentrate grade and recovery rate of lithium mica.

[0025] Among them, sodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamate is an anionic surfactant, and its molecule contains three carboxyl groups and one sulfonic acid group, so it is extremely soluble in water and has foaming properties, overcoming the disadvantages of poor water solubility and low activity of anionic collectors such as fatty acids, alkyl sulfonic acids, sulfuric acids and petroleum sulfonates at low temperatures. The carboxyl group is conducive to cleaning the fine-grained slime covering the surface of lithium mica minerals, promoting the adsorption of the collector on the surface of lithium mica, so it is not sensitive to water quality and slime; ether diamine is a cationic surfactant, and an ether group (-O-) is introduced into the non-polar hydrocarbon group in the amine molecule, so its freezing point is reduced and its solubility is improved, it is easy to disperse in the pulp, has a fast flotation speed, strong selectivity and good foam fluidity; after mixing the anionic surfactant and the cationic surfactant, the association effect between the two surfactant molecules is conducive to reducing the surface tension and critical micelle concentration of the system, enhancing the selectivity of the collector; alkylphenol polyoxyethylene ether is a non-ionic surfactant, has strong emulsifying properties, and is stable in nature, resistant to acid and alkali and low in cost. It can reduce the Coulomb force between anionic and cationic surfactant molecules, improve the surface activity of the anionic and cationic surfactant system, play a solubilization role to improve the dissolution performance of the system, reduce the critical micelle concentration of the system, and enhance the collecting ability and selectivity of the collector; the alcohol in the alcohol polar organic matter additive has a significant effect on the surface tension of the aqueous solution of the ionic surfactant. Adding alcohol can significantly reduce the surface tension of the aqueous solution. On the one hand, it reduces the surface tension of the collector, and on the other hand, it forms a mixed adsorption film with the surfactant, increasing the adsorption amount, thereby improving the compactness of the adsorption film and enhancing the collecting performance of the collector.

[0026] The beneficiation method provided by this application is beneficial to improving the operation efficiency of flotation equipment, facilitating industrial implementation, achieving efficient recovery of associated fine-grained lepidolite with medium and low grades, and improving both the grade and recovery rate of lepidolite concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope of the present invention.

[0028] Figure 1 It is the beneficiation process flow for Examples 1-4 and Comparative Examples 1-6.

[0029] Figure 2 It is the beneficiation process flow for Comparative Examples 7-8. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] As used herein, the terms:

[0031] "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing" or any other variation thereof used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article or device containing the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article or device.

[0032] The connecting word "consisting of" excludes any unstated element, step or component. If used in a claim, this phrase will render the claim closed, excluding materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the claim body rather than immediately following the subject, it only limits the elements described in that clause; other elements are not excluded from the claim as a whole.

[0033] When an equivalent, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values and lower preferred values, this should be understood to specifically disclose all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is separately disclosed. For example, when the range "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values and all integers and fractions within the range.

[0034] In these embodiments, unless otherwise specified, the parts and percentages are by mass.

[0035] "Parts by mass" refers to the basic measurement unit representing the mass ratio relationship of multiple components. 1 part can represent any unit mass, such as 1 g or 2.689 g, etc. If we say that the mass of component A is a parts by mass and the mass of component B is b parts by mass, it means the mass ratio of component A to component B is a:b. Or it means the mass of component A is aK and the mass of component B is bK (K is any number representing a multiple factor). It should not be misunderstood that, different from the number of parts by mass, the sum of the parts by mass of all components is not limited to 100 parts.

[0036] "And / or" is used to indicate that one or both of the described situations may occur. For example, A and / or B includes (A and B) and (A or B).

[0037] The lithium mica flotation collector provided by this application comprises raw materials in the following parts by weight: 4 - 40 parts of sodium N-octadecyl-N-1,2-dicarboxyethyl sulfonated succinamide, for example, it can be 4 parts, 10 parts, 16 parts, 22 parts, 28 parts, 34 parts, 40 parts or any value between 4 - 40 parts; 1 - 10 parts of ether diamine, for example, it can be 1 part, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts or any value between 1 - 10 parts; 1 - 10 parts of alkylphenol polyoxyethylene ether, for example, it can be 1 part, 1.5 parts, 3.5 parts, 5.5 parts, 7.5 parts, 9.5 parts, 10 parts or any value between 1 - 10 parts; 1 - 10 parts of alcohol polar organic matter additive, for example, it can be 1 part, 1.5 parts, 3.5 parts, 5.5 parts, 7.5 parts, 9.5 parts, 10 parts or any value between 1 - 10 parts.

[0038] In an alternative embodiment of this application, the mass ratio of the sodium N-octadecyl-N-1,2-dicarboxyethyl sulfonated succinamide, the ether diamine, the alkylphenol polyoxyethylene ether and the alcohol polar organic matter additive is (4 - 6):1:(0.4 - 0.6):(0.4 - 0.6), for example, it can be 4:1:0.4:0.4, 4:1:0.6:0.4, 4.5:1:0.5:0.6, 5:1:0.5:0.5, 6:1:0.4:0.6 or any value between (4 - 6):1:(0.4 - 0.6):(0.4 - 0.6).

[0039] The core problem of lithium mica recovery is the flotation separation of lithium mica from silicate gangue minerals such as feldspar and quartz. These three minerals belong to the same category of silicate minerals. When subjected to external forces, the aluminum-oxygen bonds and silicon-oxygen bonds in lithium mica and feldspar crystals are broken, exposing K +and the "micro-region" of silicate tetrahedral anions; when quartz minerals are subjected to external forces, silicon-oxygen bonds in the crystal are also broken. Therefore, the surfaces of all three minerals are negatively charged in aqueous solution, and cationic collectors are electrostatically adsorbed on the mineral surfaces.

[0040] All three minerals have good floatability in a relatively wide pH range in the cationic collector flotation system and are basically non-floatable in the anionic collector flotation system. In the anionic and cationic collector flotation system, the cationic collector preferentially adsorbs on the "micro-region" of the surfaces of lepidolite and feldspar minerals, reducing the electronegativity of the mineral surfaces, thereby reducing the electrostatic repulsion between the mineral surfaces and the anionic collector, and enabling the Al on the mineral surface 3+ to undergo specific adsorption with the anionic collector. At the same time, the anionic collector balances the electrostatic repulsion between the cationic collector molecules, making the collector molecular layer on the mineral surface more compact and enhancing the hydrophobicity of the minerals. Lepidolite belongs to typical layered silicate minerals and fractures along the cleavage plane when subjected to external forces. The area ratio of its cleavage plane to the end face is large, resulting in a relatively low relative density of polyvalent cations to anions on the surface. In addition, the exposed K + is extremely soluble in aqueous solution and undergoes ion exchange with H + to generate ion exchange, and the mineral surface has a strong ability to bond with hydroxyl groups; while the quartz mineral surface only has weak electrostatic adsorption due to the lack of a "micro-region" and cannot undergo specific adsorption with the anionic collector.

[0041] Therefore, in the anionic and cationic collector system, by adjusting the appropriate ratio of anionic and cationic collectors, adding non-ionic surfactants and short-chain polar organic compounds to reduce the critical micelle concentration of the collectors, the flotation separation of lepidolite from quartz and feldspar minerals can be achieved. The anionic surfactant and cationic surfactant in this application are compounded in a certain mass ratio, avoiding the reaction between the two surfactants to produce precipitation. In addition, the association effect between the two surfactant molecules is beneficial to reducing the surface tension and critical micelle concentration of the system and enhancing the selectivity of the collector.

[0042] In an alternative embodiment of this application, the alcohol-based polar organic compound additive is octanol; the ether diamine is C8-C 12 ether diamine, and more preferably C 10 ether diamine.

[0043] Alcohols in the alcohol-based polar organic additives have a significant impact on the surface tension of the ionic surfactant aqueous solution. The influence of alcohols on the surface tension of the surfactant solution varies with the carbon chain length. Generally, the carbon chain length used is not greater than that of the surfactant. Within this range, the longer the carbon chain length, the more the surface tension of the surfactant solution decreases. Therefore, in this application, octanol with a carbon chain length of 8 carbons is used as the alcohol-based polar organic additive. On the one hand, it further reduces the surface tension of the collector, and on the other hand, by forming a mixed adsorption film with the surfactant, it increases the adsorption amount, thereby improving the compactness of the adsorption film and enhancing the collecting performance of the collector.

[0044] This application also provides a beneficiation method for lepidolite, including: crushing and grinding the ore containing lepidolite, adding water to make a pulp; adding the above-mentioned lepidolite flotation collector to the pulp, and obtaining lepidolite concentrate through a flotation process of two rough selections, one scavenging, and two cleanings.

[0045] In an optional embodiment of this application, the flotation process of the two rough selections includes: adding 100 - 1000 g / t of the lepidolite collector to the pulp, for example, it can be 100 g / t, 300 g / t, 500 g / t, 700 g / t, 900 g / t, 1000 g / t, or any value between 100 - 1000 g / t, stirring for 1 - 3 minutes, and floating for 2 - 6 minutes. More preferably, stir for 2 minutes and float for 4 minutes to obtain the first rough concentrate and the first rough tailings; add 50 - 500 g / t of the lepidolite collector to the first rough tailings, for example, it can be 50 g / t, 100 g / t, 200 g / t, 300 g / t, 400 g / t, 500 g / t, or any value between 50 - 500 g / t, stir for 1 - 3 minutes, and float for 2 - 6 minutes to obtain the second rough concentrate and the second rough tailings.

[0046] In an optional embodiment of this application, the flotation process of the first scavenging includes: adding 25 - 250 g / t of the lepidolite collector to the second rough tailings obtained from the second rough selection, for example, it can be 25 g / t, 50 g / t, 100 g / t, 150 g / t, 200 g / t, 250 g / t, or any value between 25 - 250 g / t, stirring for 1 - 3 minutes, and floating for 2 - 6 minutes to obtain the scavenging concentrate and the scavenging tailings.

[0047] In an alternative embodiment of the present application, the two-stage beneficiation flotation process includes: after combining the first rougher concentrate obtained from the first rougher and the second rougher concentrate obtained from the second rougher, without adding reagents, performing flotation for 2 to 6 minutes, more preferably 6 minutes, to obtain a first-stage beneficiation concentrate and a first-stage beneficiation tailing; without adding reagents to the first-stage beneficiation concentrate, performing flotation for 2 to 6 minutes, more preferably 4 minutes, to obtain a second-stage beneficiation concentrate and a second-stage beneficiation tailing.

[0048] It should be noted that "g / t" mentioned in the present application refers to the addition amount of reagents relative to the original ore. For example, the addition amount of the lithium mica collector is 300 g / t, which means that 300 g of the lithium mica collector needs to be added for processing 1 ton of the original ore containing lithium mica.

[0049] In an alternative embodiment of the present application, the first-stage beneficiation tailing obtained from the first-stage beneficiation and the scavenger concentrate obtained from the first scavenging are returned for the second rougher.

[0050] In an alternative embodiment of the present application, the second-stage beneficiation tailing obtained from the second-stage beneficiation is returned for the first-stage beneficiation.

[0051] In the present application, two-stage rougher processes are adopted, which is beneficial to improving the grade and recovery rate of the lithium mica rougher concentrate; the present application also adopts a beneficiation process in which the tailing after the first-stage beneficiation operation and the scavenger concentrate are combined and returned to the second rougher, and the tailing after the second-stage beneficiation operation is returned to the first-stage beneficiation, reasonably distributing the loads of the first rougher operation and the second rougher operation, which is beneficial to improving the flotation efficiency.

[0052] In an alternative embodiment of the present application, the mass concentration of the pulp made by adding water is 20% to 40%, for example, it can be 20%, 25%, 30%, 35%, 40% or any value between 20% and 40%; the pH of the pulp is 6 to 8, for example, it can be 6.0, 6.5, 7.0, 7.3, 7.5, 8 or any value between 6 and 8.

[0053] Hereinafter, the embodiments of the present invention will be described in detail in conjunction with specific examples. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. For those not specified in the examples, they are carried out under conventional conditions or conditions recommended by the manufacturer. For reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0054] Example 1

[0055] In this embodiment, the grade of Li2O in the lepidolite ore is 1.20%. The main useful minerals in the ore are lepidolite, and the gangue minerals are mainly quartz, followed by plagioclase, topaz, biotite, albite, orthoclase, fluorite, chlorite and diopside. There are also a small amount of tremolite, kaolinite, calcite, trace amounts of apatite, serpentine, sphene, zircon, etc. The lithium in the ore is mainly hosted in lepidolite, and lepidolite mainly exists in the form of coarse flakes and flake aggregates. Secondly, it is embedded in gangue minerals in the form of fine scaly aggregates. Minerals such as chlorite, kaolinite, calcite, and serpentine in the ore are prone to slime during the grinding process, covering the surface of lepidolite minerals and affecting the flotation index.

[0056] The lepidolite flotation collector provided in this embodiment is composed of four components: sodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamide, C 10 ether diamine, alkylphenol polyoxyethylene ether and octanol, and they are composed according to the mass ratio of 4:1:0.6:0.4. Before the flotation process, these four components are mixed with water and stirred evenly to prepare a 5% mixed aqueous solution for use.

[0057] This embodiment provides a beneficiation method for lepidolite. The schematic diagram of the beneficiation process is as Figure 1 shown, and the specific steps are as follows:

[0058] (1) The ore containing lepidolite is crushed and ground to -0.074mm accounting for 75%, and water is added to make a 30% pulp, and its natural pH is 7.3;

[0059] (2) The pulp prepared in step (1) is added to the flotation cell, and then the prepared mixed aqueous solution of lepidolite collector is added for flotation test. The flotation process is two rough selections, one scavenging, and two cleanings; among them, during the first rough selection operation, 500 g / t of lepidolite collector is added, stirred for 2 minutes, and floated for 4 minutes to produce the first rough concentrate and the first rough tailings; 300 g / t of lepidolite collector is added to the first rough tailings, stirred for 2 minutes, and floated for 4 minutes to produce the second rough concentrate and the second rough tailings; 200 g / t of lepidolite collector is added to the second rough tailings, stirred for 2 minutes, and floated for 4 minutes to produce the scavenged lepidolite concentrate and the scavenged tailings (this scavenged tailings is the final tailings);

[0060] The first rough concentrate and the second rough concentrate are combined and enter the first cleaning operation. No reagent is added during the first cleaning operation, and it is floated for 6 minutes to produce the first cleaned concentrate and the first cleaned tailings; the first cleaned tailings and the first scavenged concentrate are combined and returned for the second rough selection operation; the first cleaned concentrate enters the second cleaning operation, no reagent is added, and it is floated for 4 minutes to produce the second cleaned concentrate (this second cleaned concentrate is the final lepidolite concentrate) and the second cleaned tailings; the second cleaned tailings are returned for the first cleaning operation.

[0061] Example 2

[0062] In the lithium mica flotation collector provided in this example, the mass ratio of tetrasodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamide, C 10 ether diamine, alkylphenol polyoxyethylene ether, and octanol is 5:1:0.6:0.4.

[0063] The process flow and reagent dosage of the ore dressing method for lithium mica provided in this example are the same as those in Example 1.

[0064] Example 3

[0065] In the lithium mica flotation collector provided in this example, the mass ratio of tetrasodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamide, C 10 ether diamine, alkylphenol polyoxyethylene ether, and octanol is 6:1:0.6:0.4.

[0066] The process flow and reagent dosage of the ore dressing method for lithium mica provided in this example are the same as those in Example 1.

[0067] Comparative Example 1

[0068] In the lithium mica flotation collector provided in this comparative example, sodium oleate is used to replace tetrasodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamide, and the others are the same as in Example 1.

[0069] The process flow and reagent dosage of the ore dressing method for lithium mica provided in this comparative example are the same as those in Example 1.

[0070] Comparative Example 2

[0071] In the lithium mica flotation collector provided in this comparative example, C 10 ether diamine is replaced by dodecylamine, and the others are the same as in Example 1.

[0072] The process flow and reagent dosage of the ore dressing method for lithium mica provided in this comparative example are the same as those in Example 1.

[0073] Comparative Example 3

[0074] In the lithium mica flotation collector provided in this comparative example, the mass ratio of tetrasodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamide, C 10 ether diamine, alkylphenol polyoxyethylene ether, and octanol is 3:1:0.6:0.4.

[0075] The process flow and reagent dosage of the ore dressing method for lithium mica provided in this comparative example are the same as those in Example 1.

[0076] Comparative Example 4

[0077] In the lithium mica flotation collector provided in this comparative example, the mass ratio of the four components of sodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamide, C 10 ether diamine, alkylphenol polyoxyethylene ether, and octanol is 2:1:0.6:0.4.

[0078] The process flow and reagent dosage of the ore dressing method of the lithium mica provided in this comparative example are the same as those in Example 1.

[0079] Comparative Example 5

[0080] In the lithium mica flotation collector provided in this comparative example, there is no octanol component, and the others are the same as in Example 1.

[0081] The process flow and reagent dosage of the ore dressing method of the lithium mica provided in this comparative example are the same as those in Example 1.

[0082] Comparative Example 6

[0083] In the lithium mica flotation collector provided in this comparative example, there is no alkylphenol polyoxyethylene ether component, and the others are the same as in Example 1.

[0084] The process flow and reagent dosage of the ore dressing method of the lithium mica provided in this comparative example are the same as those in Example 1.

[0085] Table 1 Test results of Examples 1-3 and Comparative Examples 1-6

[0086]

[0087]

[0088] The flotation test results of Examples 1-3 and Comparative Examples 1-6 are listed in Table 1 above. It can be seen from Table 1 that in Examples 1-3, the lithium mica collector provided by the present invention is composed of four components of sodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamide, C 10 ether diamine, alkylphenol polyoxyethylene ether, and octanol according to a certain mass ratio. The lithium mica ore of this example is processed by a flotation process of two rough selections, one scavenging, and two cleanings. Among them, in Example 1, a beneficiation index of 3.05% grade of Li2O and 89.19% recovery rate of Li2O in the lithium mica concentrate was obtained. The grade of Li2O in the lithium mica concentrate in Examples 2 and 3 is higher than that in Example 1, but its recovery rate of Li2O is lower.

[0089] The test results of Comparative Examples 1-6 show that changing the types and ratios of anionic and cationic collectors in the lithium mica collector or reducing the types of collector components results in lower comprehensive indexes of the grade and recovery rate of the obtained lithium mica concentrate than the test indexes of Example 1.

[0090] This shows that the lithium mica flotation collector provided by this application is not simply composed of several components randomly, but takes into account the synergistic effect of the intermolecular forces among the anionic surfactant molecules, cationic surfactant molecules, non-ionic surfactant molecules, and alcohol polar organic additive molecules in the collector, and achieves the goal of promoting the improvement of ore dressing indexes through the compounding of specific ratios among the components.

[0091] Example 4

[0092] In this example, the grade of Li2O in the lithium mica ore is 0.65%. The useful minerals in the ore are mainly lithium mica, and the gangue minerals are mainly quartz, followed by plagioclase, topaz, biotite, albite, orthoclase, fluorite, chlorite, and diopside, with a small amount of tremolite, kaolinite, calcite, and trace amounts of apatite, serpentine, sphene, zircon, etc. The lithium in the ore is mainly hosted in lithium mica, and lithium mica is mainly disseminated in gangue minerals in the form of fine scaly aggregates. Minerals such as chlorite, kaolinite, calcite, and serpentine in the ore are prone to slime during the grinding process and cover the surface of lithium mica minerals, affecting the flotation indexes.

[0093] The lithium mica flotation collector provided by this example is composed of four components: sodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamide, C 10 ether diamine, alkylphenol polyoxyethylene ether, and octanol, in a mass ratio of 4:1:0.6:0.4. Before the flotation process, these four components are mixed with water and stirred evenly to prepare a 5% mixed aqueous solution for use.

[0094] The ore dressing method for lithium mica provided by this example, the schematic diagram of its ore dressing process is as Figure 1 shown, and the specific steps are as follows:

[0095] (1) Crush and grind the ore containing lithium mica to -0.074mm accounting for 75%, add water to make a 30% pulp, and the natural pH is 7.3;

[0096] (2) Add the prepared pulp to the flotation tank, add the prepared lepidolite collector to conduct a flotation test; the flotation process is two roughing operations, one scavenging operation, and two cleaning operations; in the first roughing operation, add lepidolite collector 300g / t, stir for 2 minutes, float for 4 minutes, and produce a first roughing concentrate and a first roughing tailing; add lepidolite collector 150g / t to the first roughing tailing, stir for 2 minutes, float for 4 minutes, and produce a second roughing concentrate and a second roughing tailing; add lepidolite collector 50g / t to the second roughing tailing, stir for 2 minutes, float for 4 minutes, and produce a second roughing concentrate and a second roughing tailing; , float for 4 minutes, and produce scavenging concentrate and scavenging tailings (final tailings); the primary roughing concentrate and the secondary roughing concentrate are combined to enter the first concentration operation, and no reagent is added in the first concentration operation. The flotation is 6 minutes, and the primary concentration concentrate and the primary concentration tailings are produced; the primary concentration tailings and the scavenging concentrate are combined and returned for the second roughing operation; the primary concentration concentrate enters the second concentration operation, and no reagent is added in the second concentration operation. The flotation is 4 minutes, and the secondary concentration concentrate (final concentrate) and the secondary concentration tailings are produced; the secondary concentration tailings are returned to the first concentration operation.

[0097] Comparative Example 7

[0098] In this comparative example, sulfuric acid is used as the adjusting agent and dodecylamine is used as the lepidolite flotation collector.

[0099] The mineral processing flow diagram is as follows: Figure 2 The specific steps are as follows:

[0100] (1) Crushing and grinding the ore to -0.074 mm, accounting for 75%, adding water to make a 30% slurry with a natural pH of 7.3;

[0101] (2) Add the prepared pulp into the flotation cell, add the regulator sulfuric acid and stir to adjust the pH value of the pulp to 3, then add the collector dodecylamine for spodumene flotation test; the flotation process is two rough selections, one scavenging, and two cleanings; add 4000 g / t of sulfuric acid in the first rough selection operation, stir for 2 minutes, then add 150 g / t of the collector dodecylamine for spodumene, stir for 2 minutes, and flotation for 4 minutes to produce the first rough concentrate and the first rough tailings; add 2000 g / t of sulfuric acid to the first rough tailings, stir for 2 minutes, then add 60 g / t of the collector dodecylamine for spodumene, stir for 2 minutes, and flotation for 4 minutes to produce the second rough concentrate and the second rough tailings; add 1000 g / t of sulfuric acid to the second rough tailings, stir for 2 minutes, then add 40 g / t of the collector dodecylamine for spodumene, stir for 2 minutes, and flotation for 4 minutes to produce the scavenging concentrate and the scavenging tailings (final tailings); the first rough concentrate and the second rough concentrate are combined and enter the first cleaning operation. Add 1000 g / t of sulfuric acid in the first cleaning operation, stir for 2 minutes, and flotation for 6 minutes to produce the first cleaning concentrate and the first cleaning tailings; the first cleaning tailings and the scavenging concentrate are combined and returned for the second rough selection operation; the first cleaning concentrate enters the second cleaning operation. Add 500 g / t of sulfuric acid during the second cleaning operation, stir for 2 minutes, and flotation for 4 minutes to produce the second cleaning concentrate (final concentrate) and the second cleaning tailings; the second cleaning tailings are returned for the first cleaning operation.

[0102] Comparative Example 8

[0103] In this comparative example, the regulators used are sodium carbonate and sodium hydroxide, and the collectors for spodumene flotation are dodecylamine and 731 oxidized paraffin soap.

[0104] The schematic diagram of its ore dressing process is as shown in Figure 2 shown, and the specific steps are as follows:

[0105] (1) Crush and grind the ore to -0.074 mm accounting for 75%, add water to make a 30% pulp, and the natural pH is 7.3;

[0106] (2) Add the prepared pulp into the flotation cell, add the regulators sodium carbonate and sodium hydroxide and stir to adjust the pH value of the pulp to 11.5, then add the collector dodecylamine for lepidolite and oxidized paraffin soap 731 for flotation test; the flotation process is two rough selections, one scavenging, and two cleanings; for the first rough selection operation, add 1000 g / t of sodium carbonate and 300 g / t of sodium hydroxide respectively, stir for 2 minutes, then add 150 g / t of dodecylamine for lepidolite and 300 g / t of oxidized paraffin soap 731 respectively, stir for 2 minutes, and float for 4 minutes to produce the first rough concentrate and the first rough tailings; add 200 g / t of sodium carbonate and 60 g / t of sodium hydroxide respectively to the first rough tailings, stir for 2 minutes, then add 60 g / t of dodecylamine for lepidolite and 120 g / t of oxidized paraffin soap 731 respectively, stir for 2 minutes, and float for 4 minutes to produce the second rough lepidolite concentrate and the second rough tailings; add 100 g / t of sodium carbonate and 30 g / t of sodium hydroxide respectively to the second rough tailings, stir for 2 minutes, then add 30 g / t of dodecylamine for lepidolite and 60 g / t of oxidized paraffin soap 731 respectively, stir for 2 minutes, and float for 4 minutes to produce the scavenging concentrate and the scavenging tailings (final tailings); the first rough concentrate and the second rough concentrate are combined and enter the first cleaning operation, no medicine is added in the first cleaning operation, float for 6 minutes to produce the first cleaning concentrate and the first cleaning tailings; the first cleaning tailings and the scavenging concentrate are combined and returned to the second rough selection operation; the first cleaning concentrate enters the second cleaning operation, no medicine is added in the second cleaning operation, float for 4 minutes to produce the second cleaning concentrate (final concentrate) and the second cleaning tailings; the second cleaning tailings are returned to the first cleaning operation.

[0107] Table 2 Test Results of Example 4 and Comparative Examples 7-8

[0108]

[0109]

[0110] By comparing the data in Table 2, it can be found that: in Comparative Examples 7-8, the comprehensive beneficiation indexes of the Li2O grade and recovery rate in the final concentrate obtained by using the traditional acidic pulp cationic collector flotation scheme and the flotation scheme of using both cationic and anionic collectors in alkaline pulp are lower than the beneficiation indexes of the Li2O grade of 2.76% and the Li2O recovery rate of 89.90% of the lepidolite concentrate in Example 4 of this application.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

[0112] In addition, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not others, the combination of features of different embodiments means within the scope of the present invention and forms different embodiments. For example, in the claims above, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is only intended to enhance the understanding of the overall background of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those skilled in the art.

Claims

1. A collector for spodumene flotation, characterized in that, Its raw materials include: sodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamate, ether diamine, alkylphenol polyoxyethylene ether, and alcohol polar organic matter additive; The ether diamine is an ether diamine having C8-C 12 ; The mass ratio of the sodium N-octadecyl-N-1,2-dicarboxyethyl sulfosuccinamate, the ether diamine, the alkylphenol polyoxyethylene ether, and the alcohol polar organic matter additive is (4-6):1:(0.4-0.6):(0.4-0.6).

2. The collector for spodumene flotation according to claim 1, characterized in that, The alcohol polar organic matter additive is octanol.

3. A beneficiation method for lepidolite, characterized in that Use the lithium mica flotation collector described in claim 1 or 2.

4. The ore dressing method according to claim 3, characterized in that It includes: Crush and grind the ore containing lithium mica, and add water to make pulp; Add the lithium mica flotation collector to the pulp, and through a flotation process of two rough selections, one scavenging, and two cleanings, obtain lithium mica concentrate.

5. The ore dressing method according to claim 4, characterized in that, The flotation process of the two rough selections includes: adding 100-1000 g / t of the lithium mica collector to the pulp, stirring for 1-3 minutes, and floating for 2-6 minutes to obtain the first rough concentrate and the first rough tailings; Add 50-500 g / t of the lithium mica collector to the first rough tailings, stir for 1-3 minutes, and float for 2-6 minutes to obtain the second rough concentrate and the second rough tailings.

6. The ore dressing method according to claim 4, wherein The flotation process of the first scavenging includes: adding 25-250 g / t of the lithium mica collector to the second rough tailings obtained from the second rough selection, stirring for 1-3 minutes, and floating for 2-6 minutes to obtain the scavenging concentrate and the scavenging tailings.

7. The ore dressing method according to claim 4, wherein The flotation process of the two cleanings includes: after combining the first rough concentrate obtained from the first rough selection and the second rough concentrate obtained from the second rough selection, floating for 2-6 minutes to obtain the first cleaning concentrate and the first cleaning tailings; Float the first cleaning concentrate for 2-6 minutes to obtain the second cleaning concentrate and the second cleaning tailings.

8. The ore dressing method according to claim 4, characterized in that The first cleaning tailings obtained from the first cleaning and the scavenging concentrate obtained from the first scavenging are returned to the flotation process of the second rough selection; The second cleaning tailings obtained from the second cleaning are returned to the flotation process of the first cleaning.

9. The ore dressing method according to any one of claims 4-8, characterized in that, The mass concentration of the pulp made by adding water is 20%-40%, and the pH is 6-8.

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