A method for recovering tungsten from lepidolite concentrate

Abstract

The present invention discloses a method for recovering tungsten from lepidolite concentrate, which comprises the following steps: S1. Mix the lepidolite concentrate and a roasting additive to obtain a mixture A; the roasting additive includes a lithium extraction additive and a tungsten extraction additive; S2. Grind the mixture A to obtain a mixture B, and then granulate it to obtain lepidolite concentrate particles; S3. Roast the lepidolite concentrate particles to obtain a mixture C; S4. Perform water leaching on the mixture C, and after filtration, obtain a leaching residue and a leaching solution. The present invention can effectively achieve the co-leaching of lithium and tungsten, and the tungsten recovery rate can reach more than 80% without affecting the lithium extraction process.

Description

Technical Field

[0001] The present invention belongs to the field of tungsten extraction and relates to a method for recovering tungsten from lepidolite concentrate. Background Art

[0002] As an important metal element, tungsten has the physical characteristics of high melting point, high hardness, and high density. Its chemical properties are stable, and it can play the roles of many elements and compounds. Its unique physical and chemical properties make tungsten and its compounds play an important role in many fields such as alloys, chemical engineering, aerospace, etc. With the increasing exploitation year by year, the high-grade and easy-to-process tungsten ore resources in China are basically exhausted. Currently, the tungsten ores used in industrial production are mostly low-grade and difficult-to-process tungsten ores, or tungsten ore resources associated with other metal ores. Traditional industrial production technologies for treating such minerals mostly require high-temperature, high-pressure, and high-alkali wet processing to achieve a better decomposition rate. The impurity components in the leaching solution are complex and the impurity content is high, which greatly increases the technical requirements and treatment costs for subsequent purification and impurity removal, and at the same time generates a large amount of industrial wastewater containing salt. Currently, the main factor affecting tungsten recovery in industrial production is the transformation and decomposition of insoluble or poorly soluble tungsten in tungsten ore resources. The decomposition methods of tungsten mineral raw materials mainly include acid decomposition method and alkali decomposition method.

[0003] From the literature and industrial practice, the decomposition processes of tungsten minerals, whether it is the wet high-pressure leaching method, caustic soda leaching method, sodium fluoride leaching method or the pyroprocess NaOH roasting - water leaching method, direct smelting method, are not very suitable for treating low-grade tungsten-containing minerals from the perspectives of economic benefits and environmental protection.

[0004] The grade of lepidolite concentrate is generally low, but it is associated with various valuable metals. The lepidolite concentrate obtained by beneficiation of lepidolite contains a small amount of tungsten resources. According to the current industry situation, it is necessary to recover as much as possible to obtain higher economic benefits. Currently, there is no clear roasting transformation and tungsten extraction method in the pyroprocess roasting and lithium extraction process of lepidolite concentrate, and the tungsten recovery rate is very low (<10%). If it is necessary to decompose tungsten during leaching, a large amount of acid or alkali needs to be consumed, which will dissolve a large amount of impurities in the leaching solution while increasing the tungsten leaching rate. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies and defects in the background art, and provide a method for recovering tungsten from lepidolite concentrate, which has good roasting transformation effect on tungsten in lepidolite concentrate, high tungsten leaching rate, and does not affect the main lithium extraction process.

[0006] To solve the above technical problem, the technical solution proposed by the present invention is as follows:

[0007] A method for recovering tungsten from lepidolite concentrate, comprising the following steps:

[0008] S1. Mix the lepidolite concentrate and the roasting additive to obtain mixture A;

[0009] The roasting additive includes a lithium extraction additive and a tungsten extraction additive;

[0010] The lithium extraction additive includes lithium extraction additive a and lithium extraction additive b. Lithium extraction additive a is sodium sulfate or potassium sulfate, and lithium extraction additive b includes one or more of calcium carbonate, calcium sulfate, and calcium oxide;

[0011] The tungsten extraction additive is sodium carbonate or potassium carbonate;

[0012] The mass ratio of the lepidolite concentrate to the lithium extraction additive is 1:0.1 - 0.6, and the addition amount of the tungsten extraction additive is 0.1% - 5% of the total mass of the lepidolite concentrate and the lithium extraction additive;

[0013] S2. Grind mixture A to obtain mixture B, and then granulate to obtain lepidolite concentrate particles;

[0014] S3. Roast the lepidolite concentrate particles to obtain mixture C;

[0015] S4. Leach mixture C with water, and after filtration, obtain leaching residue and leaching solution.

[0016] As a further improvement, the tungsten content in the lepidolite concentrate is less than 1000 ppm.

[0017] As a further improvement, the lithium extraction additive is sodium sulfate, calcium carbonate, and calcium sulfate, and the mass ratio is lepidolite concentrate:calcium sulfate:sodium sulfate:calcium carbonate = 1:0.2 - 0.5:0.1 - 0.2:0.1 - 0.2.

[0018] As a further improvement, in S2, grind until the particle size is above 100 mesh, and add water for mixing and granulation.

[0019] As a further improvement, the roasting temperature in S3 is 600°C - 900°C.

[0020] As a further improvement, the roasting temperature in S3 is 800°C - 900°C.

[0021] As a further improvement, the liquid-solid ratio of water leaching in S4 is 0.8 - 4:1.

[0022] As a further improvement, the liquid-solid ratio of water leaching in S4 is 1:1.

[0023] As a further improvement, the water leaching temperature in S4 is 20°C - 80°C.

[0024] As a further improvement, the water leaching temperature in S4 is 20°C.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] In the present invention, a tungsten-rich leaching solution is obtained by granulating-roasting-leaching lepidolite concentrate. After the lepidolite concentrate is mixed and ground with an auxiliary roasting additive and granulated, the lepidolite concentrate and the auxiliary have a larger contact area, the reaction incidence rate is increased, the material transformation rate in the roasting stage is greatly improved, and further the leaching effect is improved.

[0027] There is no chemical reaction between the tungsten extraction additive and the lithium extraction additive added in the present invention. The tungsten extraction reaction and the lithium extraction reaction do not interfere with each other and have no impact on the transformation of lithium during the roasting process, and the co-extraction of lithium and tungsten can be effectively achieved.

[0028] In addition, during leaching in the present invention, the roasted mica pellets are directly used for leaching with clear water at normal temperature and pressure. Without stirring and additional addition of other substances, a high leaching rate can be ensured.

[0029] In the present invention, up to 90% of the tungsten in the tungsten-containing lepidolite concentrate is leached into the leaching solution, greatly improving the tungsten recovery effect. The recovery effect can reach more than 80% without affecting the lithium extraction process.

[0030] The process of the present invention avoids the problem of using a large amount of acids and alkalis in the traditional process for treating low-grade tungsten-containing materials. In the treatment of tungsten-containing lepidolite concentrate, the simultaneous conversion and simultaneous leaching of lithium and tungsten can be effectively achieved. The low leaching liquid-solid ratio results in a high concentration in the leaching solution, reducing the recovery difficulty and cost, and at the same time reducing the amount of wastewater generated and the treatment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic process flow diagram in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To facilitate the understanding of the present invention, the following will describe the present invention more comprehensively and in detail in conjunction with the accompanying drawings of the specification and the preferred embodiments. However, the protection scope of the present invention is not limited to the following specific embodiments.

[0034] Unless otherwise defined, all technical terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the scope of the present invention.

[0035] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in the present invention can be obtained through the market or can be prepared by existing methods.

[0036] As Figure 1 , in some specific embodiments, the method for recovering tungsten from lepidolite concentrate in the present invention includes the following steps:

[0037] S1. Mix the lepidolite concentrate and roasting additives (lithium extraction additive and tungsten extraction additive) to obtain mixture A.

[0038] In some embodiments, the tungsten content in the lepidolite concentrate is less than 1000 ppm.

[0039] In some embodiments, the lithium extraction additive includes lithium extraction additive a and lithium extraction additive b. Lithium extraction additive a is sodium sulfate or potassium sulfate, and lithium extraction additive b includes one or more of calcium carbonate, calcium sulfate, and calcium oxide. The lithium extraction additive does not react with tungsten during roasting. The mass ratio of lepidolite concentrate to lithium extraction additive is 1:0.1 - 0.6. Preferably, lithium extraction additive a is sodium sulfate, and lithium extraction additive b is calcium carbonate and calcium sulfate, with the mass ratio of lepidolite concentrate:calcium sulfate:sodium sulfate:calcium carbonate = 1:0.2 - 0.5:0.1 - 0.2:0.1 - 0.2.

[0040] In some embodiments, the tungsten extraction additive is sodium carbonate or potassium carbonate. The addition amount of the tungsten extraction additive is 0.1% - 5% of the total mass of the lepidolite concentrate and the lithium extraction additive, preferably 1% - 5%.

[0041] In some embodiments, the preparation method of mixture A includes the following steps:

[0042] (1) Mix the lepidolite concentrate and the lithium extraction additive to obtain mixture A 1 ;

[0043] (2) Mix mixture A 1 with the tungsten extraction additive to obtain mixture A.

[0044] S2. Grind mixture A to obtain mixture B, and then granulate to obtain lepidolite concentrate particles.

[0045] In some embodiments, grind until the particle size is above 100 mesh, preferably 200 mesh - 1000 mesh.

[0046] In some embodiments, S2 includes the following steps:

[0047] (1) Mix the mixture B with water to obtain the mixture B 1 ;

[0048] (2) Granulate the mixture B 1 to obtain spodumene concentrate particles.

[0049] S3. Roast the spodumene concentrate particles to obtain the mixture C.

[0050] In some embodiments, the roasting temperature is 600°C to 900°C, preferably 800°C to 900°C.

[0051] S4. Leach the mixture C with water, and after filtration, obtain the leaching residue D and the leaching solution E (tungsten-rich and lithium-rich leaching solution).

[0052] In some embodiments, the liquid-solid ratio of the water leaching of the mixture C is 0.8 to 4:1, preferably 1:1, and the water leaching temperature is room temperature (20°C) to 80°C, preferably room temperature (20°C).

[0053] The liquid-solid ratio in the present invention refers to the mass ratio of the liquid and the solid in the material.

[0054] In the roasting, the action mechanism of the tungsten extraction additive is as follows:

[0055] Na 2 CO 3 + CaWO 4 = Na 2 WO 4 + CaO + CO 2

[0056] Most of the tungsten in the spodumene concentrate exists in the form of CaWO 4 that is insoluble in water. By adding Na 2 CO 3 and roasting, CaWO 4 is transformed into Na 2 WO 4 that is easily soluble in water, so that tungsten enters the solution in the form of WO 4 2- for recovery. Na 2 CO 3 transforms the tungsten in the concentrate, improves the recovery rate and recovery effect of tungsten in the subsequent water leaching, and does not affect the main process of lithium extraction.

[0057] The reaction mechanism of the lithium extraction additive:

[0058] Li 2 O·Al 2 O 3·4SiO 2 +Na 2 SO 4 →Li 2 SO 4 +Na 2 O·Al 2 O 3 ·4SiO 2

[0059] In lepidolite concentrate, lithium mainly exists in the form of water-insoluble Li 2 O. By adding Na 2 SO 4 for roasting, Li 2 O is converted into water-soluble Li 2 SO 4 , enabling lithium to enter the solution in the form of Li + for recovery.

[0060] The main function of calcium sulfate in the lithium extraction additive is to increase the melting point of the material and fix fluorine. The function of calcium carbonate is to fix fluorine, decompose to generate pores and increase the porosity. Calcium oxide is mainly used to fix fluorine. The fluorine fixation effect reduces the fluorine content in the flue gas and the flue gas treatment cost by retaining a large amount of fluorine in the roasting product of lepidolite concentrate. At the same time, the carbon dioxide generated by the decomposition of calcium carbonate and the reaction of sodium carbonate with calcium tungstate is beneficial to the porosity of the roasting product after pellet roasting in this process, improving the leaching effect.

[0061] Except for Na 2 SO 4 , other lithium extraction additives do not participate in the main reactions of the lithium recovery process. All lithium extraction additives do not react with CaWO 4 in lepidolite concentrate. Therefore, the tungsten recovery rate is low without additional additives. At the same time, the addition of Na 2 CO 3 has no impact on the main lithium extraction process. Therefore, adding Na 2 CO 3 can effectively transform and roast tungsten in lepidolite concentrate, thus improving the tungsten recovery effect in lepidolite concentrate.

[0062] The chemical compositions (%) of lepidolite concentrate in the following examples and comparative examples are as follows: Li 2 O 2.02%, WO 3 0.16%, SiO 2 48.3%, F 4.03%, Al 2 O 3 20.34%, Rb 2 O 0.62%, Cs 2 O 0.05%.

[0063] Example 1

[0064] The method for recovering tungsten and lithium from lepidolite concentrate in this example is specifically granulation - roasting - water leaching after adding auxiliary materials to lepidolite concentrate as raw material, including the following steps:

[0065] S1. Mix lepidolite concentrate with a lithium extraction additive (composed of calcium sulfate, sodium sulfate and calcium carbonate, concentrate:calcium sulfate:sodium sulfate:calcium carbonate = 1:0.2:0.1:0.1) to obtain mixture A 1 .

[0066] Add sodium carbonate as a tungsten extraction additive in proportion to 0.1% of the mass of mixture A, mix evenly and contact fully to obtain mixture A. 1

[0067] S2. Conduct fine grinding on mixture A until the particle size reaches over 300 mesh to obtain mixture B.

[0068] Add water to mixture B in proportion to 10% to obtain mixture B 1 . Mixture B 1 is granulated to obtain lepidolite concentrate particles.

[0069] S3. Roast the lepidolite concentrate particles at 900 °C to obtain mixture C (lepidolite granule clinker).

[0070] S4. Conduct water leaching on mixture C according to a liquid - solid ratio of 1:1 to obtain leaching residue D and leaching solution E.

[0071] Analyze and detect the leaching residue and leaching solution obtained in Example 1, and calculate the relevant lithium and tungsten leaching rates. The results are shown in Table 1.

[0072] Example 2

[0073] The method for recovering tungsten from lepidolite concentrate in this example is specifically granulation - roasting - water leaching after adding auxiliary materials to lepidolite concentrate as raw material, including the following steps:

[0074] S1. Mix lepidolite concentrate with a lithium extraction additive (composed of calcium sulfate, sodium sulfate and calcium carbonate, concentrate:calcium sulfate:sodium sulfate:calcium carbonate = 1:0.2:0.1:0.1) to obtain mixture A 1 .

[0075] Add sodium carbonate as a tungsten extraction additive in proportion to 1% of the mass of mixture A, mix evenly and contact fully to obtain mixture A. 1

[0076] S2. Conduct fine grinding on mixture A until the particle size reaches over 300 mesh to obtain mixture B.

[0077] ​​Mixing material B is added with water at a ratio of 10% to obtain mixing material B 1 Mixing material B 1 is granulated to obtain spodumene concentrate particles.

[0078] S3. The spodumene concentrate particles are calcined at 900 °C to obtain mixing material C.

[0079] S4. Mixing material C is leached with water at a liquid-solid ratio of 1:1 to obtain leaching residue D and leaching solution E.

[0080] The leaching residue and leaching solution obtained in Example 2 are analyzed and detected, and the relevant lithium and tungsten leaching rates are calculated. The results are shown in Table 1.

[0081] Example 3

[0082] The method for recovering tungsten from spodumene concentrate in this example is basically the same as that in Example 2, except that: in step S1, the dosage of sodium carbonate is increased to 2%.

[0083] The leaching residue and leaching solution obtained in Example 3 are analyzed and detected, and the relevant lithium and tungsten leaching rates are calculated. The results are shown in Table 1.

[0084] Example 4

[0085] The method for recovering tungsten from spodumene concentrate in this example is basically the same as that in Example 2, except that: in step S1, the dosage of sodium carbonate is increased to 5%.

[0086] The leaching residue and leaching solution obtained in Example 4 are analyzed and detected, and the relevant lithium and tungsten leaching rates are calculated. The results are shown in Table 1.

[0087] Comparative Example 1

[0088] The method for recovering tungsten from spodumene concentrate in this comparative example is basically the same as that in Example 2, except that: sodium carbonate is not added in step S1.

[0089] The leaching residue and leaching solution obtained in Comparative Example 1 are analyzed and detected, and the relevant lithium and tungsten leaching rates are calculated. The results are shown in Table 1.

[0090] Comparative Example 2

[0091] The method for recovering tungsten from spodumene concentrate in this comparative example is basically the same as that in Example 2, except that: sodium hydroxide is added in step S1 to replace sodium carbonate.

[0092] The leaching residue and leaching solution obtained in Comparative Example 2 are analyzed and detected, and the relevant lithium and tungsten leaching rates are calculated. The results are shown in Table 1.

[0093] The roasting in the above examples and comparative experiments was carried out in a rotary kiln. The specific process parameters were as follows: roasting temperature 900 °C, roasting time 1 h. The roasted product was used as the raw material for water leaching. During water leaching, there was no need for crushing and stirring. The leaching temperature was at room temperature. The countercurrent leaching method was adopted, with the liquid-solid ratio maintained at 1:1, and the single leaching time was 8 hours, for a total of 32 hours. Finally, the contents of residual tungsten and lithium in the leaching residue and the contents of tungsten and lithium in the leaching solution were measured, and the leaching rates of tungsten and lithium in water leaching were calculated based on the original contents in the concentrate.

[0094]

[0095] As can be seen from Table 1, the feasibility of roasting-solvent extraction for tungsten recovery by adding sodium carbonate to the lithium mica concentrate of the present invention was demonstrated. Co-extraction of lithium and tungsten could be achieved with appropriate addition amounts. At the same time, in Comparative Example 2, using NaOH instead of Na 2 CO 3 for the experiment, the results showed that under the experimental conditions, the recovery effect of tungsten could not be effectively improved. The reason was that sodium hydroxide dissolved at 900 °C, which was not conducive to the reaction and the transformation of effective tungsten on the one hand, and caused adhesion between the materials on the other hand, thus affecting the leaching effects of tungsten and lithium.

[0096] Example 5

[0097] The method for tungsten recovery from the lithium mica concentrate in this example was basically the same as that in Example 2, except that: the liquid-solid ratio in the leaching solution in Step S4 was adjusted.

[0098] The leaching residue and leaching solution obtained in Example 5 were analyzed and detected, and the relevant leaching rates of lithium and tungsten were calculated. The results are shown in Table 2.

[0099] Table 2 Leaching of lithium and tungsten at different liquid-solid ratios in Example 5

[0100]

[0101] As can be seen from Table 2, the tungsten leaching rate in the present invention was different under different liquid-solid ratios, and the leaching rate increased with the increase of the liquid-solid ratio. Considering the leaching solution concentration and subsequent water treatment, a liquid-solid ratio of 1:1 was more suitable for water leaching in the present invention.

[0102] Example 6

[0103] The method for tungsten recovery from the lithium mica concentrate in this example was basically the same as that in Example 2, except that: the roasting temperature was reduced in Step S3, and the leaching effect after roasting under different roasting temperatures was investigated, with the liquid-solid ratio of the leaching solution being 1:1.

[0104] The leaching residue and leaching solution obtained in Example 6 were analyzed and detected, and the relevant leaching rates of lithium and tungsten were calculated. The results are shown in Table 3.

[0105] Table 3 Leaching of lithium and tungsten in Example 6 at different roasting temperatures

[0106]

[0107] As can be seen from Table 3, in the present invention, the roasting temperature has a very significant impact on the leaching effects of lithium and tungsten. A relatively low roasting temperature is more conducive to the successful transformation of tungsten, but severely restricts the transformation of lithium, and even no reaction occurs under such temperature conditions. Therefore, according to different lithium mica concentrates, it is necessary to select an appropriate roasting temperature according to their properties and the addition of auxiliary materials to achieve the purpose of recovering lithium and tungsten after co-leaching.

[0108] Example 7

[0109] The method for recovering tungsten in the lithium mica concentrate of this example uses the roasted material obtained in Example 6 for water leaching. The difference lies in: adjusting the leaching temperature in step S4, and investigating the leaching effect of tungsten under different leaching temperature conditions. The raw material used is the roasted clinker obtained under the condition of 600 °C in Example 6.

[0110] The leaching residues and leaching solutions obtained in Example 7 are analyzed and detected to calculate the relevant leaching rates. The results are shown in Table 4.

[0111] Table 4 Leaching of tungsten in Example 7 at different leaching temperatures

[0112]

[0113] As can be seen from Table 4, in the present invention, the leaching temperature has a relatively small impact on the leaching effect of tungsten, and the leaching effect of heating leaching is not more ideal compared with normal temperature leaching.

[0114] Example 8

[0115] The method for recovering tungsten in the lithium mica concentrate of this example uses the roasted material obtained in Example 6 for water leaching. The difference lies in: grinding the roasted clinker, heating and stirring during leaching, and investigating the leaching effect of tungsten under different leaching states. The raw material used is the roasted clinker obtained under the condition of 600 °C in Example 6.

[0116] The leaching residues and leaching solutions obtained in Example 8 are analyzed and detected to calculate the relevant leaching rates. The results are shown in Table 4.

[0117] Table 5 Leaching of tungsten in Example 8 under different leaching states

[0118]

[0119] As can be seen from Table 5, in the present invention, the use of powder leaching can result in a higher leaching rate of tungsten. However, considering the process and economic benefits, it is more appropriate to directly perform leaching without grinding treatment.

[0120] Based on Example 2, the effects of different calcium carbonate addition amounts on the lithium leaching rate and fluorine fixation effect were studied, and the results are shown in Table 6.

[0121] Table 6

[0122]

[0123] As can be seen from the above results, the present invention can effectively improve the recovery effect of tungsten in lepidolite. Under appropriate process control conditions, the tungsten in the lepidolite concentrate can be basically completely transformed. The product after roasting can be directly leached with water at normal temperature and pressure, with high water leaching efficiency and high tungsten leaching rate. The water used for leaching can be reused repeatedly, avoiding secondary pollution such as the generation of waste water. At the same time, the roasted product does not need to be crushed or ground before water leaching, and no stirring or addition of other additives such as acids or alkalis is required during leaching, which is more environmentally friendly while ensuring the leaching rate.

[0124] In addition, the present invention can effectively achieve the co-leaching of lithium and tungsten in the lepidolite concentrate leaching process, without generating additional processes for the main lithium leaching process, providing an effective method for recovering lithium and tungsten from tungsten-containing lepidolite concentrate.

[0125] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Therefore, any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for recovering tungsten from lepidolite concentrate, characterized in that: The following steps are involved: S1, mixing the lepidolite concentrate and the roasting additive to obtain a mixture A; The roasting additives include lithium extraction additives and tungsten extraction additives; The lithium extraction additives are sodium sulfate, calcium carbonate and calcium sulfate, and the mass ratio is lepidolite concentrate: calcium sulfate: sodium sulfate: calcium carbonate = 1:0.2:0.1:0.1; The tungsten extraction additive is sodium carbonate, and the amount of the tungsten extraction additive added is 1% of the total mass of the lepidolite concentrate and the lithium extraction additive; S2, grinding the mixture A to obtain a mixture B, and then granulating it to obtain lithium mica concentrate particles; S3, roasting the lithium mica concentrate particles to obtain a mixture C, the roasting temperature being 900° C.; S4. Soaking the mixed material C in water, and obtaining the leaching residue and the leaching liquid after filtering; the liquid-to-solid ratio of the leaching is 1:

1.

2. The method for recovering tungsten in lepidolite concentrate according to claim 1, characterized in that: The tungsten content in the lithium mica concentrate is less than 1000ppm.

3. The method for recovering tungsten in lepidolite concentrate according to claim 1 or 2, characterized in that: The S2 is ground until the particle size is above 100 mesh, and water is added and mixed to granulate.

4. The method for recovering tungsten in lepidolite concentrate according to claim 1 or 2, characterized in that: The S4 water immersion temperature is 20°C to 80°C.

5. The method for recovering tungsten in lepidolite concentrate according to claim 4, characterized in that: The S4 water immersion temperature is 20°C.

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