A beneficiation method for lepidolite

Abstract

This invention relates to a beneficiation method for lepidolite, comprising: classifying lepidolite-bearing minerals to obtain coarse-grained ore and fine-grained ore; subjecting the fine-grained ore to desliming and flotation sequentially to obtain a first lepidolite concentrate; separating the coarse-grained ore using a spiral sluice to obtain a second lepidolite concentrate; and combining the first and second lepidolite concentrates to obtain a final lepidolite concentrate. The collector used in the flotation comprises, by weight, 15-30 parts of sodium oleate sulfate, 5-10 parts of coconut oil amine, 7-15 parts of carboxylic acid, 4-8 parts of C1-C3 alcohol, and 2-6 parts of methyl isobutyl methanol. The beneficiation method provided by this invention, through a combined gravity-flotation beneficiation process, uses gravity separation to recover coarse-grained lepidolite and flotation to recover fine-grained lepidolite, solving the beneficiation problem of simultaneously recovering coarse-grained and fine-grained lepidolite, and efficiently recovering lepidolite minerals.

Description

Technical Field

[0001] This invention relates to the field of lepidolite beneficiation, and more specifically to a method for beneficiating lepidolite. Background Technology

[0002] Currently, lepidolite is one of the most important resources for lithium extraction. Therefore, efficient recovery of lepidolite minerals and improvement of lepidolite resource utilization are of great significance to the sustainable development of the lithium industry.

[0003] The beneficiation of lepidolite mainly employs flotation. One method involves using cationic amine collectors under acidic pulp conditions; the other involves using a combination of fatty acid and amine cationic / anionic collectors under neutral or weakly alkaline pulp conditions. While using cationic amine collectors for lepidolite flotation under acidic pulp conditions is currently a relatively mature flotation method with advantages such as high recovery rate and good stability, amine collectors have significant drawbacks, including the need to add large amounts of hydrochloric acid during preparation and use, high volatility and corrosiveness, high requirements for equipment corrosion resistance, and significant health hazards. Furthermore, the complex reagent formulation of fatty acid + amine combined collectors requires the use of large amounts of inhibitors or dispersants, making subsequent filtration operations difficult and hindering the smooth operation of the production process.

[0004] For example, CN107008567A provides a method for the separation of lepidolite using dodecylamine polyoxyethylene ether as a collector. The separation process consists of secondary hydrocyclone desliming, primary roughing, secondary cleaning, and primary scavenging. Specifically, it includes the following steps: after crushing the raw ore, it is wet-milled to obtain a slurry. The pH is adjusted to 3-4 using sulfuric acid as a modifier. Dodecylamine polyoxyethylene ether is used as the collector (120-160 g / t) to perform flotation separation on the slurry, yielding a lepidolite concentrate with a Li₂O grade of 3.17% and a Li₂O recovery rate of 66.38%. Although this flotation process is adaptable to slime and can obtain lepidolite concentrate with a high Li₂O grade, the process is complex, and desliming leads to Li₂O loss (resulting in a relatively low Li₂O recovery rate). Furthermore, all flotation operations require the addition of sulfuric acid to maintain the flotation pulp environment of lepidolite as strongly acidic. Strongly acidic flotation environments have drawbacks such as high requirements for equipment corrosion protection, poor flotation working environment, and high wastewater treatment costs.

[0005] For example, CN 104741245A provides a collector that combines anionic collector sodium oleate or sodium oxycarbonate soap 731 with cationic collector dodecylamine or cocoylamine. First, in the roughing process of lepidolite, water glass (800-1200 g / t) as a gangue inhibitor, sodium oleate or sodium oxycarbonate soap (480-700 g / t) as an anionic collector, and dodecylamine or cocoylamine (130-160 g / t) as a cationic collector are added. In the fine process, water glass is added as an inhibitor (600-900 g / t in total). In the scavenging process, an anionic collector (130-245 g / t) and a cationic collector (100-125 g / t) are added, ultimately yielding lepidolite concentrate and tailings. The drawback of this process is that the reagent preparation is complicated and the collector has poor resistance to mud. A large amount of water glass needs to be added to reduce the harmful effect of mud on the flotation of lepidolite. However, the addition of a large amount of water glass will greatly increase the absolute value of the negative potential on the surface of the mud, enhance the electrostatic repulsion of the same charge between the fine mineral particles in the tailings, keep them in a dispersed state, and make it difficult for the tailings water to settle.

[0006] Flotation is a highly efficient mineral recovery technology that relies on the adsorption of lepidolite onto its surface by flotation reagents to achieve recovery. However, lepidolite is a flexible, refractory mineral that is difficult to grind; even after fine grinding, a large number of flaky particles remain, with their planar dimensions always being many times larger than their thickness. Due to the large size and weight of coarse-grained lepidolite flakes, they are difficult to adsorb onto the froth for recovery, making them easily lost in the tailings and thus affecting the recovery rate.

[0007] Therefore, there is an urgent need to develop a beneficiation method that is highly efficient, has minimal environmental impact, is highly adaptable, and can simultaneously recover both coarse and fine-grained lepidolite. Summary of the Invention

[0008] In view of the problems existing in the prior art, the purpose of the present invention is to provide a beneficiation method for lepidolite to solve the problem of poor recovery effect in lepidolite flotation.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] This invention provides a method for beneficiating lepidolite, the method comprising:

[0011] The lithium-bearing mica minerals are graded to obtain coarse-grained and fine-grained minerals;

[0012] The fine-grained ore was deslimed and flotated in sequence to obtain the first lepidolite concentrate;

[0013] The collector used in the flotation process comprises, by weight, 15-30 parts of sodium oleate sulfate, 5-10 parts of coconut oil amine, 7-15 parts of carboxylic acid, 4-8 parts of C1-C3 alcohol, and 2-6 parts of methyl isobutyl methanol.

[0014] The mineral processing method provided by this invention employs a combined gravity-flotation process, which involves grinding, coarse and fine classification, coarse gravity separation, and fine desliming followed by flotation. This process recovers coarse lepidolite by gravity separation and fine lepidolite by flotation, effectively recovering both coarse and fine lepidolite. This solves the problem of simultaneously recovering coarse and fine lepidolite, and efficiently recovers lepidolite minerals.

[0015] Furthermore, by combining a specific flotation process with a specific collector, efficient flotation of useful minerals in lepidolite ore is achieved. In this invention, desliming with a hydrocyclone is used to pre-remove small-particle-size slime, eliminating its influence on lepidolite flotation. The working principle of the specific collector is as follows: the use of appropriate carboxylic acids, C1-C3 alcohols, and methyl isobutyl methanol enhances the collector's performance, resulting in selective adsorption on the lepidolite surface, improving both collection capacity and selectivity. Sodium oleate n-butyl sulfate and cocoamine significantly improve the selective adsorption of the collector on the lepidolite surface through synergistic collecting action. Furthermore, the combination of methyl isobutyl methanol with sodium oleate n-butyl sulfate and cocoamine can regulate the foam state, further facilitating lepidolite flotation. This method can be used to process lepidolite ore of various particle sizes, with a wide range of applications.

[0016] As a preferred embodiment of the present invention, the coarse ore has a particle size > 0.3 mm.

[0017] Preferably, the particle size of the fine-grained ore is ≤0.3mm.

[0018] As a preferred technical solution of the present invention, the desliming includes processing with a hydrocyclone.

[0019] Preferably, the desliming process is performed at least once.

[0020] Preferably, the particle size of the solid particles mixed in the overflow obtained from the desliming is ≤0.010mm.

[0021] As a preferred technical solution of the present invention, the flotation includes roughing, cleaning and sweeping.

[0022] As a preferred embodiment of the present invention, the flotation reagents used in the roughing process include collectors and modifiers.

[0023] Preferably, the amount of the coarse-selective collector added is 200-800 g / t.

[0024] Preferably, the amount of the coarse selection modifier added is 500-2000 g / t.

[0025] Preferably, the modifier comprises sodium carbonate and / or sodium bicarbonate.

[0026] As a preferred technical solution of the present invention, the selection is blank selection.

[0027] As a preferred technical solution of the present invention, the scavenging is to perform flotation on the tailings obtained from the roughing.

[0028] As a preferred embodiment of the present invention, the flotation reagents used in the sweeping process include collectors.

[0029] Preferably, the amount of the scavenging collector added is 50-100 g / t.

[0030] As a preferred technical solution of the present invention, the coarse selection is performed at least once.

[0031] Preferably, the selection process is performed at least twice.

[0032] Preferably, the scanning is performed at least once.

[0033] As a preferred technical solution of the present invention, the obtained coarse-grained ore is subjected to gravity separation to obtain a second lepidolite concentrate.

[0034] Preferably, the first lepidolite concentrate and the second lepidolite concentrate are combined to obtain lepidolite concentrate.

[0035] Preferably, the reselection is carried out using a spiral chute, and the lateral inclination angle of the spiral chute is 8-10°.

[0036] Compared with existing technical solutions, the present invention has the following beneficial effects:

[0037] (1) The beneficiation method of lepidolite of the present invention adopts a gravity-flotation combined process flow of grinding-coarse and fine classification-coarse gravity separation-fine desliming and flotation. The gravity separation method is used to recover coarse lepidolite, and a specific collector is used in the flotation to recover fine lepidolite. This solves the beneficiation problem that it is difficult to recover coarse and fine lepidolite at the same time, and efficiently recovers lepidolite minerals.

[0038] (2) The beneficiation method for lepidolite described in this invention employs a specifically configured collector that is easily dissolved and dispersed in the slurry, achieving selective adsorption on the surface of lepidolite and improving both collection capacity and selectivity. This overcomes the significant drawbacks of traditional amine collectors, such as the need to add large amounts of hydrochloric acid during preparation and use, high volatility and corrosiveness, high requirements for equipment corrosion resistance, and significant harm to human health. It also avoids the disadvantages of traditional fatty acid + amine combination collectors, which have complex formulations, require the use of large amounts of inhibitors or dispersants, and cause difficulties in subsequent filtration operations and hinder smooth production processes.

[0039] (3) The gravity-flotation combined process adopted in this invention has strong adaptability and is less affected by mineral properties. It can be used to process lithium mica ore with different particle size compositions and has a wide range of applications. It is an efficient mineral processing method for recovering lithium mica resources. Attached Figure Description

[0040] Figure 1 This is a flowchart of the beneficiation method for lepidolite provided in an embodiment of the present invention.

[0041] The present invention will now be described in further detail. However, the examples described below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims. Detailed Implementation

[0042] To better illustrate the present invention and facilitate understanding of its technical solutions, typical but non-limiting embodiments of the present invention are as follows:

[0043] This embodiment provides a method for beneficiating lepidolite, such as... Figure 1 As shown, the beneficiation method for lepidolite includes:

[0044] The lithium-bearing mica minerals are graded to obtain coarse-grained and fine-grained minerals;

[0045] The fine-grained ore was deslimed and flotated in sequence to obtain the first lepidolite concentrate;

[0046] The collector used in the flotation process comprises, by weight, 15-30 parts of sodium oleate sulfate, 5-10 parts of coconut oil amine, 7-15 parts of carboxylic acid, 4-8 parts of C1-C3 alcohol, and 2-6 parts of methyl isobutyl methanol.

[0047] In this invention, the lithium-containing mica mineral includes mined and crushed raw ore or other usable minerals.

[0048] In this invention, the sodium oleate sulfate in the collector used in the flotation is 15-30 parts by weight, for example, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30 parts, but is not limited to the listed values, and other unlisted values ​​within this range are also acceptable.

[0049] In this invention, the collector used in the flotation process contains 5-10 parts by weight of coconut oil amine, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, but is not limited to the listed values, and values ​​not listed in this range are also acceptable.

[0050] In this invention, the carboxylic acid in the collector used in the flotation is 7-15 parts by weight, for example, 7, 8, 9, 10, 11, 12, 13, 14 or 15 parts, but not limited to the listed values, and values ​​not listed in this range are also acceptable.

[0051] In this invention, the C1-C3 alcohol in the collector used in the flotation is 4-8 parts by weight, for example, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts, etc., but not limited to the listed values, and values ​​not listed in this range are also acceptable.

[0052] In this invention, the methyl isobutyl methanol in the collector used in the flotation is 2-6 parts by weight, for example, 2 parts, 3 parts, 4 parts, 5 parts or 6 parts, but not limited to the listed values, and values ​​not listed in this range are also acceptable.

[0053] In this invention, the carboxylic acid in the collector includes one or a combination of at least two of formic acid, acetic acid, or propionic acid.

[0054] In this invention, the C1-C3 alcohols in the collector include one or a combination of at least two of methanol, ethanol, n-propanol, or isopropanol.

[0055] Specifically, the grading can be achieved using grading methods commonly used in the art, such as screening, hydraulic classification, cyclone classification, etc.

[0056] Specifically, the coarse ore has a particle size > 0.3 mm.

[0057] Specifically, the particle size of the fine-grained ore is ≤0.3mm.

[0058] In this invention, the particle size refers to an aggregate of all particles within that range. This aggregate can be a particle aggregate composed of particles within any subset of the defined particle size range. For example, the coarse-grained ore can be an aggregate of all particles within the range of ≥0.4mm, or an aggregate of all particles within the range of 0.4-0.6mm, or an aggregate of all particles within the range of 0.8-1mm, etc., and so on for fine-grained ore.

[0059] Specifically, the desliming process includes treatment using a hydrocyclone.

[0060] Specifically, the desliming process is performed at least once.

[0061] Specifically, the particle size of the solid particles mixed in the overflow obtained from the desliming is ≤0.010mm.

[0062] Specifically, the flotation includes roughing, cleaning and sweeping.

[0063] The pH value of the pulp at the beginning of roughing is controlled at 8-10, and an adjusting agent is used for adjustment.

[0064] Specifically, the flotation reagents used in the roughing process include collectors and modifiers.

[0065] Specifically, the amount of collector added in the coarse selection is 200-800 g / t, for example, it can be 200 g / t, 300 g / t, 400 g / t, 500 g / t, 600 g / t, 700 g / t or 800 g / t, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0066] In this invention, the unit of addition is g / t, which refers to the mass of reagent added per ton of raw ore.

[0067] Specifically, the amount of the coarse selection modifier added is 500-2000 g / t, for example, it can be 500 g / t, 600 g / t, 700 g / t, 800 g / t, 900 g / t, 1000 g / t, 1100 g / t, 1200 g / t, 1300 g / t, 1400 g / t, 1500 g / t, 1600 g / t, 1700 g / t, 1800 g / t, 1900 g / t or 2000 g / t, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0068] Specifically, the modifier includes sodium carbonate and / or sodium bicarbonate.

[0069] Specifically, the coarse selection is performed at least once.

[0070] Specifically, the selected selection is a blank selection.

[0071] In this invention, the blank selection refers to flotation of the rough concentrate obtained from the roughing process without adding flotation reagents.

[0072] Specifically, the selection process is performed at least twice.

[0073] Specifically, the scavenging refers to flotation of the tailings obtained from the roughing process.

[0074] Specifically, the flotation reagents used in the sweeping process include collectors.

[0075] Specifically, the amount of collector added during scavenging is 50-100 g / t, for example, it can be 50 g / t, 60 g / t, 70 g / t, 80 g / t, 90 g / t or 100 g / t, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0076] Specifically, the scanning is performed at least once.

[0077] Furthermore, the obtained coarse-grained ore is subjected to gravity separation to obtain a second lepidolite concentrate;

[0078] The first and second lepidolite concentrates are combined to obtain lepidolite concentrate.

[0079] The reselection process can be carried out using commonly used reselection techniques in this field, such as using a spiral chute, in which case the lateral inclination angle of the spiral chute is controlled to be 8-10°.

[0080] The middlings obtained from the re-separation are returned to the grinding process for reuse.

[0081] To more clearly illustrate the beneficiation method for lepidolite provided by this invention, the following specific embodiments are provided for explanation:

[0082] Example 1

[0083] This embodiment provides a beneficiation method for lepidolite, which involves beneficiating a certain lepidolite ore (Li2O content of 1.18%), including the following beneficiation steps:

[0084] (a) After the mineral is ground in a ball mill to a content of 45% in -0.074mm, it enters a high-frequency vibrating screen to obtain coarse particles of +0.30mm and fine particles of -0.30mm.

[0085] (b) The +0.30mm coarse-grained material obtained in step (a) is mixed with water to form a slurry until the mass concentration of the resulting slurry is 23%; the second lithium mica concentrate is obtained by gravity separation using a spiral sluice, and the ore in the spiral sluice is returned to the ball mill; the transverse inclination angle of the spiral sluice is 9°.

[0086] (c) The -0.30mm fine-grained material obtained in step (a) is deslimed using a hydrocyclone to obtain the slurry sand. Water is added to adjust the slurry until the mass concentration of the resulting slurry is 35%. Sodium carbonate is added to adjust the pH of the slurry to 8.5. A collector is added for flotation to produce the first lepidolite concentrate and tailings. The first lepidolite concentrate and the second lepidolite concentrate obtained in step (a) are combined as the lepidolite concentrate.

[0087] Among them, the -0.30mm fine-grained material is deslimed by hydrocyclone, and the resulting sand is slurry adjusted and then floated by flotation machine; the modifier used is sodium carbonate, and the collector used is composed of 20 parts of sodium oleate sulfate, 6 parts of coconut oil amine, 10 parts of acetic acid, 6 parts of ethanol and 4 parts of methyl isobutyl methanol by mass.

[0088] The primary roughing process includes: adding a modifier and a collector to the slurry to perform flotation on lepidolite to obtain a primary roughing concentrate and a primary roughing tailings; the primary roughing tailings are used as feed for a primary scavenging process, and the primary roughing concentrate is used as feed for a secondary cleaning process; based on the feed rate, the amount of modifier added is 800 g / t, and the amount of collector added is 350 g / t;

[0089] The primary scavenging process includes: adding a collector to the tailings of the primary roughing process to float lepidolite to obtain a primary scavenging concentrate and tailings, and returning the primary scavenging concentrate to the primary roughing process; wherein, based on the feed rate, the amount of collector added is 60 g / t.

[0090] The refining process includes: using the primary roughing concentrate as feed for the secondary refining process to perform blank refining, resulting in primary refined concentrate and primary refined tailings; the primary refined tailings are returned to the primary roughing operation, and the primary refined concentrate is used as feed for the secondary refining process to perform blank refining, resulting in secondary refined concentrate and secondary refined tailings; the secondary refined tailings are returned to the primary refining operation.

[0091] Example 2

[0092] This embodiment provides a beneficiation method for lepidolite, which involves beneficiating a certain lepidolite ore (Li2O content of 1.13%), including the following beneficiation steps:

[0093] (a) After the mineral is ground in a ball mill to a content of 50% in -0.074mm, it enters a high-frequency vibrating screen to obtain coarse-grained material of +0.30mm and fine-grained material of -0.30mm.

[0094] (b) The +0.30mm coarse-grained material obtained in step (a) is mixed with water to form a slurry until the mass concentration of the resulting slurry is 25%; the second lithium mica concentrate is obtained by gravity separation using a spiral sluice, and the ore in the spiral sluice is returned to the ball mill; the transverse inclination angle of the spiral sluice is 9°.

[0095] (c) The -0.30mm fine-grained material obtained in step (a) is deslimed using a hydrocyclone to obtain the slurry sand. Water is added to adjust the slurry until the mass concentration of the resulting slurry is 33%. Sodium carbonate is added to adjust the pH of the slurry to 8.5. A collector is added for flotation to produce the first lepidolite concentrate and tailings. The first lepidolite concentrate and the second lepidolite concentrate obtained in step (a) are combined as the lepidolite concentrate.

[0096] In step (c) - after the 0.30mm fine-grained material is deslimed by a hydrocyclone, the resulting sediment is slurried and then floated by a flotation machine. The modifier used is sodium carbonate, and the collector used is composed of 24 parts by weight of sodium oleate sulfate, 7 parts of coconut oil amine, 12 parts of propionic acid, 7 parts of n-propanol and 5 parts of methyl isobutyl methanol.

[0097] The primary roughing process includes: adding a modifier and a collector to the slurry to perform flotation on lepidolite to obtain a primary roughing concentrate and a primary roughing tailings; the primary roughing tailings are used as feed for a primary scavenging process, and the primary roughing concentrate is used as feed for a secondary cleaning process; wherein, based on the feed rate, the amount of the modifier added is 1000 g / t, and the amount of the collector added is 400 g / t;

[0098] The primary scavenging process includes: adding a collector to the tailings of the primary roughing process to float lepidolite to obtain a primary scavenging concentrate and tailings, and returning the primary scavenging concentrate to the primary roughing process; wherein, based on the feed rate, the amount of collector added is 70 g / t.

[0099] The refining process includes: using the primary roughing concentrate as feed for the secondary refining process to perform blank refining, resulting in primary refined concentrate and primary refined tailings; the primary refined tailings are returned to the primary roughing operation, and the primary refined concentrate is used as feed for the secondary refining process to perform blank refining, resulting in secondary refined concentrate and secondary refined tailings; the secondary refined tailings are returned to the primary refining operation.

[0100] Comparative Example 1

[0101] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that: no classification is performed, and the sand obtained after the raw ore is ground and deslimed by a hydrocyclone is directly used for mineral flotation.

[0102] Comparative Example 2

[0103] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that the sodium oleate sulfate salt is replaced with oleic acid in the collector used in steps (2) and (3), and the rest is the same as in Example 1.

[0104] Comparative Example 3

[0105] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that the collector used in steps (2) and (3) is replaced with an equal amount of dodecylamine.

[0106] Comparative Example 4

[0107] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that acetic acid is replaced with an equal amount of hydrochloric acid in the collector used in steps (2) and (3). Otherwise, it is the same as in Example 1.

[0108] Comparative Example 5

[0109] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that in steps (2) and (3), ethanol is replaced with an equal amount of water in the collector. Otherwise, it is the same as in Example 1.

[0110] Comparative Example 6

[0111] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that: in steps (2) and (3), methyl isobutyl methanol is replaced with an equal amount of No. 2 oil in the collector, and the rest is the same as in Example 1; the No. 2 oil used is purchased from Beikuang Chemical Technology (Cangzhou) Co., Ltd.

[0112] Comparative Example 7

[0113] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that sodium oleate sulfate is not added to the collector used in steps (2) and (3).

[0114] Comparative Example 8

[0115] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that coconut oil amine is not added to the collector used in steps (2) and (3).

[0116] Comparative Example 9

[0117] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that carboxylic acid, i.e. acetic acid, is not added to the collector used in steps (2) and (3).

[0118] Comparative Example 10

[0119] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that ethanol is not added to the collector used in steps (2) and (3).

[0120] Comparative Example 11

[0121] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that methyl isobutyl methanol is not added to the collector used in steps (2) and (3).

[0122] Comparative Example 12

[0123] This comparative example provides a beneficiation method for lepidolite, which is the same as the beneficiation method described in Example 1, except that step (1) does not involve hydrocyclone desliming.

[0124] The Li₂O content and Li₂O recovery rate in the lepidolite concentrate of the above examples and comparative examples were detected and calculated using the following methods:

[0125] Li2O content in lepidolite concentrate: tested using the method specified in industry standard YS / T 509.1-2008;

[0126] Li2O recovery rate = (Li2O content in lepidolite concentrate × lepidolite concentrate yield) / (Li2O content in lepidolite ore × lepidolite ore yield) × 100%;

[0127] The results are detailed in Table 1.

[0128] Table 1

[0129]

[0130]

[0131] The following points can be drawn from Table 1:

[0132] (1) As can be seen from Examples 1-3, the Li2O content in the lepidolite concentrate obtained by the beneficiation method of the present invention is ≥4.02%, and the Li2O recovery rate is >91%;

[0133] (2) Comparing Example 1 with Comparative Example 1, it can be seen that, since step (1) in Comparative Example 1 omits grading, coarse lepidolite is difficult to recover in flotation operations, and the Li2O recovery rate in lepidolite concentrate decreases.

[0134] (3) Comparing Example 1 with Comparative Examples 2-6, it can be seen that in Comparative Example 2, the sodium oleate sulfate of butyl oleate was replaced with oleic acid in the collector, and the Li2O content and Li2O recovery rate in the resulting lithium mica concentrate were lower than those in Example 1; in Comparative Example 3, the coconut oil amine was replaced with dodecylamine in the collector, and the Li2O content and Li2O recovery rate in the resulting lithium mica concentrate were lower than those in Example 1; in Comparative Example 4, the acetic acid was replaced with hydrochloric acid in the collector, and hydrochloric acid and coconut oil amine easily react to form a complex, resulting in a decrease in the collecting performance of the collector, and the Li2O content and Li2O recovery rate in the resulting lithium mica concentrate were lower than those in Example 1; in Comparative Example 5, the ethanol was replaced with water in the collector, and the Li2O content and Li2O recovery rate in the resulting lithium mica concentrate were lower than those in Example 1; in Comparative Example 6, the methyl isobutyl methanol was replaced with No. 2 oil in the collector, and the concentrate was easily impurities, and the Li2O content and Li2O recovery rate in the resulting lithium mica concentrate were lower than those in Example 1.

[0135] (4) Comparing Example 1 with Comparative Examples 7-11, it can be seen that, because the collector in Comparative Example 7 does not include sodium oleate sulfate, the collecting performance of the collector is greatly reduced, which in turn leads to a decrease in the Li2O content and Li2O recovery rate in the lepidolite concentrate; because the collector in Comparative Example 8 does not include coconut oil amine, the collecting performance of the collector is greatly reduced, which in turn leads to a decrease in the Li2O content and Li2O recovery rate in the lepidolite concentrate; because the collector in Comparative Example 9 does not include... Acetic acid leads to poor solubility and dispersibility of cocoamine in the collector, resulting in a decrease in Li2O content and Li2O recovery rate in the lepidolite concentrate. Since the collector in Comparative Example 10 does not contain ethanol, its collecting performance decreases, leading to a decrease in Li2O content and Li2O recovery rate in the lepidolite concentrate. Similarly, since the collector in Comparative Example 11 does not contain methyl isobutyl methanol, the flotation froth layer is thinner, resulting in a decrease in Li2O content and Li2O recovery rate in the lepidolite concentrate.

[0136] (5) Comparing Example 1 with Comparative Example 12, it can be seen that since the hydrocyclone desliming was omitted in step (1) of Comparative Example 12, the sludge has a greater impact on the flotation of lepidolite, the Li2O content in the concentrate is reduced, and the Li2O recovery rate in the lepidolite concentrate is reduced.

[0137] The present invention is described in detail through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the components used in the present invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0138] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0139] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0140] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for beneficiation of lepidolite, characterized by, The beneficiation method for the lepidolite includes: The lithium-bearing mica minerals are graded to obtain coarse-grained and fine-grained minerals; The fine-grained ore is deslimed and flotated sequentially to obtain the first lepidolite concentrate; the flotation includes roughing, cleaning and scavenging; the flotation reagents used in the roughing include collectors and modifiers; the pH value of the pulp at the beginning of the roughing is controlled at 8-10 and adjusted using modifiers; The collector used in the flotation process consists of 15-30 parts by weight of sodium oleate n-butyl sulfate, 5-10 parts of coconut oil amine, 7-15 parts of carboxylic acid, 4-8 parts of C1-C3 alcohol and 2-6 parts of methyl isobutyl methanol. The coarse-grained ore has a particle size > 0.3 mm; The fine-grained ore has a particle size ≤ 0.3 mm.

2. The method of beneficiation of lepidolite as claimed in claim 1, wherein, The desliming process includes treatment using a hydrocyclone.

3. The method of beneficiation of lepidolite as claimed in claim 1, wherein, The desliming process shall be performed at least once.

4. The method of beneficiation of lepidolite as claimed in claim 1, wherein, The particle size of the solid particles mixed in the overflow obtained from the desliming is ≤0.010mm.

5. The method of beneficiation of lepidolite as claimed in claim 1, wherein, The amount of collector added during the rough selection is 200-800 g / t.

6. The beneficiation method for lepidolite as described in claim 1, characterized in that, The amount of the coarse selection modifier added is 500-2000 g / t.

7. The beneficiation method for lepidolite as described in claim 1, characterized in that, The modifiers include sodium carbonate and / or sodium bicarbonate.

8. The beneficiation method for lepidolite as described in claim 1, characterized in that, The selected selections are blank selections.

9. The beneficiation method for lepidolite as described in claim 1, characterized in that, The scavenging process involves flotation of the tailings obtained from the roughing process.

10. The beneficiation method for lepidolite as described in claim 1, characterized in that, The flotation reagents used in the sweeping process include collectors.

11. The beneficiation method for lepidolite as described in claim 1, characterized in that, The amount of the collector added during the scavenging process is 50-100 g / t.

12. The beneficiation method for lepidolite as described in claim 1, characterized in that, The coarse selection is performed at least once.

13. The beneficiation method for lepidolite as described in claim 1, characterized in that, The selection process is conducted at least twice.

14. The beneficiation method for lepidolite as described in claim 1, characterized in that, The scanning process shall be performed at least once.

15. The beneficiation method for lepidolite as described in claim 1, characterized in that, The obtained coarse-grained ore was subjected to gravity separation to obtain a second lepidolite concentrate.

16. The beneficiation method for lepidolite as described in claim 15, characterized in that, The first and second lepidolite concentrates are combined to obtain lepidolite concentrate.

17. The beneficiation method for lepidolite as described in claim 15, characterized in that, The reselection is carried out using a spiral chute, with a lateral inclination angle of 8-10°.

Images