A method for extracting and separating tungsten and molybdenum from tungsten and molybdenum solutions using functional ionic liquids

Abstract

The present invention proposes a method for extracting and separating tungsten and molybdenum from a tungsten-molybdenum solution using a functional ionic liquid, the method comprising the following steps: adjusting the pH value of the tungsten-molybdenum mixed solution to 3-3.5, then adding hydrogen peroxide and stirring evenly, adjusting the solution pH value to 1.5-3; using an organic phase to treat the aqueous phase feed liquid, molybdenum enters the organic phase, and tungsten remains in the raffinate, to achieve tungsten-molybdenum separation, the organic phase is composed of a quaternary phosphonium salt functional ionic liquid and a diluent; the loaded organic phase is stripped with an alkaline solution to obtain a molybdenum-containing solution, and the organic phase after stripping can be recycled after washing. The method of the present invention has the advantages of less extraction agent consumption, high separation efficiency, less tungsten co-extraction loss, less organic phase loss, and a stable extraction system.

Description

Technical Field

[0001] The invention relates to the technical field of extraction in hydrometallurgy, in particular to a method for extracting and separating tungsten and molybdenum from a tungsten-molybdenum solution by using a functional ionic liquid. Background Art

[0002] Tungsten and molybdenum are widely used in aerospace, machinery manufacturing, electronic equipment, industrial catalysis and medicine due to their many unique and excellent properties. However, the presence of molybdenum impurities seriously affects the performance of tungsten products. Therefore, my country has very strict regulations on the content of molybdenum in tungsten products, such as the Mo content in 0-grade ammonium paratungstate (APT) products must be less than 0.002%; the presence of tungsten also seriously affects the performance of molybdenum materials, so the content of tungsten impurities in molybdenum products is also very strict. For example, the national standard GB / T 3460-2007 stipulates that the tungsten content in MSA (ammonium molybdate)-0 grade products must be less than 0.015%. However, tungsten and molybdenum often coexist and cannot be effectively separated by physical processes, so it has become a key problem that the metallurgical industry needs to solve urgently. In addition, the treatment of waste molybdenum catalysts and tungsten smelting molybdenum slag also faces the problem of how to efficiently separate tungsten and molybdenum.

[0003] At present, precipitation method, extraction method and ion exchange method have been widely used in industry and have achieved good results, but they are all for low-molybdenum tungsten solution or low-tungsten molybdenum solution. When treating large amounts of tungsten-molybdenum solution, these methods have many problems. For example, when using precipitation method, excessive molybdenum content will lead to a significant increase in the consumption of precipitant and a significant increase in the loss of tungsten; the separation efficiency of ion exchange method is low. Although the addition of sulfiding agent improves the separation effect, the use of NaOH stripping will damage the resin; and the extraction method has the advantages of large production capacity, continuous production and easy automation control, and has more application prospects, but the existing extraction agent has a low direct separation efficiency. The separation efficiency can be significantly improved by compounding, modification, or adding auxiliary agents such as sulfiding agent and complexing agent.

[0004] Based on the differences in the properties of tungsten and molybdenum peroxides, many scholars have conducted research and proposed many effective extraction systems, such as tributyl phosphate + sodium pyrophosphate + H2O2 proposed in the US patent (US3969478A), trialkyl phosphine oxide + MIBK + sulfonated kerosene + H2O2 reported by Li Weixuan, and EHPA (P204 + a small amount of mono (2-ethylhexyl) phosphoric acid) + TBP + tributyl phosphine oxide (TBPO) + H2O2 proposed in the US patent (US4275039A). However, these extraction systems have problems such as the introduction of impurity ions, high water solubility of the extractant, high tungsten co-extraction rate, and unstable extraction system. The trialkylphosphine oxide (TRPO) + tributyl phosphate (TBP) + diluent + H2O2 extraction system (patent CN 102876906 B) proposed by Zhang Guiqing et al. has high separation efficiency and low tungsten co-extraction rate, which effectively solves the above problems. However, the extraction system requires a large amount of extractant, and the mixed extractant will change in proportion after long-term use due to different water solubility, resulting in reduced separation efficiency. Therefore, although the separation of tungsten and molybdenum based on the difference of tungsten and molybdenum peroxide compounds has good application prospects, there is still a lack of efficient extractants.

[0005] Acidic extractants such as P204 (di(2-ethylhexyl) phosphate), P507 (mono-2-ethylhexyl phosphonic acid), CA-12 (sec-octylphenoxy substituted acetic acid), and Cyanex272 (di(2,4,4-trimethylpentyl)phosphonic acid) can extract molybdenum cations in acidic tungsten-molybdenum solutions to achieve tungsten-molybdenum separation, but the separation efficiency is low. Summary of the invention

[0006] The present invention provides a method for extracting and separating tungsten and molybdenum from a tungsten-molybdenum solution by using a functional ionic liquid, which has the advantages of high separation efficiency, less tungsten co-extraction loss, less organic phase loss, and a stable extraction system.

[0007] The technical solution of the present invention is implemented as follows: a method for extracting and separating tungsten and molybdenum from a tungsten-molybdenum solution using a functional ionic liquid comprises the following steps:

[0008] (1) adjusting the pH value of the tungsten-molybdenum mixed solution to 3-3.5, then adding hydrogen peroxide and stirring evenly, adjusting the pH value of the solution to 1.5-3 to obtain an aqueous phase feed liquid;

[0009] (2) using an organic phase to treat the aqueous phase feed liquid, molybdenum enters the organic phase, and tungsten remains in the raffinate, thereby achieving tungsten and molybdenum separation, wherein the organic phase is composed of a quaternary phosphonium salt functional ionic liquid and a diluent;

[0010] (3) The loaded organic phase is stripped with an alkaline solution to obtain a molybdenum-containing solution, and the stripped organic phase can be recycled after washing with water.

[0011] Furthermore, the quaternary phosphonium salt functional ionic liquid is one of [P66614][P204], [P66614][P507], [P66614][CA-12], and [P66614][Cyanex272].

[0012] Furthermore, in the organic phase, the concentration of the quaternary phosphonium salt functional ionic liquid is 0.01-0.06 mol / L, and the diluent is cyclohexane.

[0013] Furthermore, in step (1), in the tungsten-molybdenum mixed solution, the WO3 concentration is 5 to 120 g / L, the Mo concentration is 3 to 30 g / L, and the WO3 / Mo mass ratio is 1:12 to 12:1.

[0014] Furthermore, in step (1), the amount of hydrogen peroxide used is 1 to 2 times the sum of the molar concentrations of tungsten and molybdenum, and the stirring time is 24 to 48 hours.

[0015] Furthermore, in step (2), the volume ratio of the organic phase to the aqueous phase is 1:1 to 2:1; and in step (3), the volume ratio of the loaded organic phase to the alkaline solution is 1:1.

[0016] Furthermore, the preparation method of the quaternary phosphonium salt functional ionic liquid comprises the following steps:

[0017] 1) slowly adding metallic sodium to isopropanol and mixing and stirring to ensure that the sodium reacts completely to form sodium isopropoxide, thereby obtaining a sodium isopropoxide solution;

[0018] 2) dissolving [P66614]Cl in isopropanol, and then adding dropwise to the sodium isopropoxide solution in step 1) to react to obtain a mixed solution, the mixed solution is kept stationary for solid-liquid separation, and then centrifuged to remove the generated white precipitate of sodium chloride, and the supernatant obtained by centrifugation is mixed and stirred with an equal volume of deionized water at room temperature to obtain [P66614][OH];

[0019] 3) [P66614][OH] is mixed with an extractant, heated and stirred, and then allowed to stand to separate an organic phase, and finally water and isopropanol in the organic phase are removed to obtain a quaternary phosphonium salt functional ionic liquid.

[0020] Furthermore, in step 3), the extractant is one of P204, P507, CA-12, and Cyanex272.

[0021] Furthermore, in step 3), the molar ratio of [P66614][OH] to the extractant is 1.1:1.

[0022] Furthermore, in step (3), the alkaline solution is one of sodium hydroxide, ammonia water, and sodium bicarbonate; and the molar concentration of the alkaline solution is 0.1 to 1 mol / L.

[0023] Beneficial effects of the present invention:

[0024] The quaternary phosphonium salt functional ionic liquid used in the present invention as an extractant has good selectivity for molybdenum in an acidic H2O2 system, and is particularly suitable for the deep separation of tungsten and molybdenum in a macro-tungsten-molybdenum solution. It has the advantages of small amount of extractant, high separation efficiency, small tungsten co-extraction loss, small organic phase loss, stable extraction system, etc., and is easy to regenerate and has good recycling performance. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The preparation method of quaternary phosphonium salt functional ionic liquid comprises the following steps:

[0027] 1) Slowly add 0.33 mol of metallic sodium into 150 mL of isopropanol and stir for 8 h to ensure that the sodium reacts completely to form sodium isopropoxide, thereby obtaining a sodium isopropoxide solution;

[0028] 2) 0.33 mol [P66614]Cl was dissolved in 500 mL isopropanol, and then added dropwise to the sodium isopropoxide solution in step 1), and stirred at 50° C. for 8 h to obtain a mixed solution, which was allowed to stand for 6 h for solid-liquid separation, and then centrifuged at 4000 r / min for 8 min to remove the generated white precipitate of sodium chloride; finally, the supernatant obtained by centrifugation was mixed and stirred with an equal volume of deionized water at room temperature for 4 h, and [P66614][OR] was hydrolyzed to obtain [P66614][OH];

[0029] 3) 320 mL [P66614] [OH] (0.344 mol / L) was mixed with the extractant, stirred at 50 ° C for 12 h and then allowed to stand for 4 h. At this time, the system was divided into an organic phase and an aqueous phase, which were separated using a separatory funnel. The organic phase was then vacuum dried at 60 ° C and 20 mbar for 2 h to remove water and isopropanol, and the final product was a quaternary phosphonium functional ionic liquid.

[0030] The extractant is one of [P204], [P507], [CA-12], and [Cyanex272],

[0031] The molar ratio of [P66614][OH] to the extractant is 1.1:1, and the quaternary phosphonium salt functional ionic liquid is [P66614][P204], [P66614][P507], [P66614][CA-12] or [P66614][Cyanex272], and its chemical structure is as follows:

[0032]

[0033]

[0034] Example 1

[0035] Organic phase composition: [P66614][Cyanex272] concentration is 0.01 mol / L, and the diluent is cyclohexane.

[0036] Aqueous phase feed liquid: The prepared tungsten-molybdenum solution has a pH value of 9.3, which is adjusted to 1.8 with dilute sulfuric acid. A 30% mass fraction of hydrogen peroxide is added, and the amount added is twice the total molar concentration of tungsten and molybdenum. Stir for 36 hours to obtain an extraction feed liquid containing 7.22g / LWO3, 3.02g / LMo, and a WO3 / Mo mass ratio of 2.39.

[0037] Extraction separation: The organic phase and aqueous phase were mixed and shaken at room temperature for 25 minutes at a ratio of 1:1, and the extraction level was 1. After stopping, centrifugation was performed for 8 minutes at a centrifugal speed of 4000r / min, and then the organic phase and the aqueous phase were separated. The loaded organic phase was stripped with 0.10mol / LNH3·H2O, the stripping ratio was 1:1, and the stripping time was 15 minutes.

[0038] Results: WO37.08 g / L, Mo 1.10 g / L were determined in the raffinate, with a separation factor of 88.27. WO30.12 g / L, Mo 1.88 g / L were determined in the stripping solution.

[0039] Example 2

[0040] Organic phase composition: [P66614][Cyanex272] concentration is 0.02 mol / L, and the diluent is cyclohexane.

[0041] Aqueous phase feed liquid: The prepared tungsten-molybdenum solution has a pH value of 9.4, which is adjusted to 1.8 with dilute sulfuric acid, and 30% hydrogen peroxide is added in an amount that is twice the total molar concentration of tungsten and molybdenum. Stir for 24 hours to obtain an extraction feed liquid containing 14.63g / LWO3, 4.22g / LMo, and a WO3 / Mo mass ratio of 3.47.

[0042] Extraction separation: The organic phase and aqueous phase were mixed and shaken at room temperature for 25 minutes at a ratio of 1:1, and the extraction level was 1. After stopping, centrifugation was performed for 8 minutes at a centrifugal speed of 4000r / min, and then the organic phase and the aqueous phase were separated. The loaded organic phase was stripped with 0.10mol / LNaHCO3, the stripping ratio was 1:1, and the stripping time was 15 minutes.

[0043] Results: WO314.34 g / L, Mo 1.61 g / L were determined in the raffinate, with a separation factor of 80.16. WO30.28 g / L, Mo 2.58 g / L were determined in the stripping liquid.

[0044] Example 3

[0045] Organic phase composition: [P66614]P204] concentration is 0.05 mol / L, and the diluent is cyclohexane.

[0046] Aqueous phase feed liquid: The prepared tungsten-molybdenum solution has a pH value of 9.5, which is adjusted to 1.8 with dilute sulfuric acid, and 30% hydrogen peroxide is added in an amount that is twice the total molar concentration of tungsten and molybdenum. Stir for 24 hours to obtain an extraction feed liquid containing 16.49 g / L WO3, 8.89 g / L Mo, and a WO3 / Mo mass ratio of 1.85.

[0047] Extraction separation: The organic phase and aqueous phase were mixed and shaken at room temperature for 25 minutes at a ratio of 1:1, and the extraction level was 1. After stopping, centrifugation was performed for 8 minutes at a centrifugal speed of 4000r / min, and then the organic phase and the aqueous phase were separated. The loaded organic phase was stripped with 0.20mol / LNaOH, the stripping ratio was 1:1, and the stripping time was 15 minutes.

[0048] Results: WO314.35 g / L, Mo 2.08 g / L were determined in the raffinate, with a separation factor of 21.95. WO32.10 g / L, Mo 6.72 g / L were determined in the stripping solution.

[0049] Example 3

[0050] Organic phase composition: [P66614][Cyanex272] concentration is 0.05 mol / L, and the diluent is cyclohexane.

[0051] Aqueous phase feed liquid: The prepared tungsten-molybdenum solution has a pH value of 9.6, which is adjusted to 2.3 with dilute sulfuric acid, and 30% hydrogen peroxide is added in an amount that is twice the total molar concentration of tungsten and molybdenum. Stir for 24 hours to obtain an extraction feed liquid containing 98.70 g / L WO3, 9.96 g / L Mo, and a WO3 / Mo mass ratio of 9.91.

[0052] Extraction separation: The organic phase and aqueous phase were mixed and shaken at room temperature for 25 minutes at a ratio of 1:1, and the extraction level was 1. After stopping, centrifugation was performed for 8 minutes at a centrifugal speed of 4000r / min, and then the organic phase and the aqueous phase were separated. The loaded organic phase was stripped with 0.20mol / LNaOH, the stripping ratio was 1:1, and the stripping time was 15 minutes.

[0053] Results: WO395.49 g / L, Mo 2.15 g / L were determined in the raffinate, with a separation factor of 108.06. WO33.20 g / L, Mo 7.80 g / L were determined in the stripping solution.

[0054] Example 4

[0055] Organic phase composition: [P66614][P204] concentration is 0.05 mol / L, and the diluent is cyclohexane.

[0056] Aqueous phase feed liquid: The prepared tungsten-molybdenum solution has a pH value of 9.6, which is adjusted to 2.1 with dilute sulfuric acid, and 30% hydrogen peroxide is added in an amount that is 1.5 times the total molar concentration of tungsten and molybdenum. Stir for 24 hours to obtain an extraction feed liquid containing 113.3 g / L WO3, 11.01 g / L Mo, and a WO3 / Mo mass ratio of 10.29.

[0057] Extraction separation: The organic phase and aqueous phase were mixed and shaken at room temperature for 25 minutes at a ratio of 1:1, and the extraction level was 1. After stopping, centrifugation was performed for 8 minutes at a centrifugal speed of 4000r / min, and then the organic phase and the aqueous phase were separated. The loaded organic phase was stripped with 0.20mol / LNaHCO3, the stripping ratio was 1:1, and the stripping time was 15 minutes.

[0058] Results: WO3109.4 g / L, Mo 2.77 g / L were determined in the raffinate, with a separation factor of 83.44. WO33.82 g / L, Mo 2.16 g / L were determined in the stripping liquid.

[0059] Example 5

[0060] Organic phase composition: [P66614][CA12] concentration is 0.05 mol / L, and the diluent is cyclohexane.

[0061] Aqueous phase feed liquid: The prepared tungsten-molybdenum solution has a pH value of 9.6, which is adjusted to 2.1 with dilute sulfuric acid, and 30% hydrogen peroxide is added in an amount that is 1.5 times the total molar concentration of tungsten and molybdenum. Stir for 24 hours to obtain an extraction feed liquid containing 113.80 g / L WO3, 10.85 g / L Mo, and a WO3 / Mo mass ratio of 10.49.

[0062] Extraction separation: The organic phase and aqueous phase were mixed and shaken at room temperature for 25 minutes at a ratio of 1:1, and the extraction level was 1. After stopping, centrifugation was performed for 8 minutes at a centrifugal speed of 4000r / min, and then the organic phase and the aqueous phase were separated. The loaded organic phase was stripped with 0.20mol / LNaHCO3, the stripping ratio was 1:1, and the stripping time was 15 minutes.

[0063] Results: WO3108.62 g / L, Mo 2.96 g / L were determined in the raffinate, with a separation factor of 55.89. WO35.06 g / L, Mo 7.82 g / L were determined in the stripping solution.

[0064] Example 6

[0065] Organic phase composition: [P66614][P507] concentration is 0.05 mol / L, and the diluent is cyclohexane.

[0066] Aqueous phase feed liquid: The prepared tungsten-molybdenum solution has a pH value of 9.6, which is adjusted to 2.1 with dilute sulfuric acid, and 30% hydrogen peroxide is added in an amount that is twice the total molar concentration of tungsten and molybdenum. Stir for 24 hours to obtain an extraction feed liquid containing 110.7 g / L WO3, 10.51 g / L Mo, and a WO3 / Mo mass ratio of 10.53.

[0067] Extraction separation: The organic phase and aqueous phase were mixed and shaken at room temperature for 25 minutes at a ratio of 1:1, and the extraction level was 1. After stopping, centrifugation was performed for 8 minutes at a centrifugal speed of 4000r / min, and then the organic phase and the aqueous phase were separated. The loaded organic phase was stripped with 0.20mol / LNaHCO3, the stripping ratio was 1:1, and the stripping time was 15 minutes.

[0068] Results: WO3105.03 g / L, Mo 3.25 g / L were determined in the raffinate, with a separation factor of 41.38. WO35.62 g / L, Mo 7.22 g / L were determined in the stripping solution.

[0069] Example 7

[0070] Organic phase composition: [P66614][Cyanex272] concentration is 0.05 mol / L, and the diluent is cyclohexane.

[0071] Aqueous phase feed liquid: The prepared tungsten-molybdenum solution has a pH value of 9.7, which is adjusted to 1.8 with dilute sulfuric acid, and 30% hydrogen peroxide is added in an amount that is 1.5 times the total molar concentration of tungsten and molybdenum. Stir for 24 hours to obtain an extraction feed liquid containing 5.87 g / L WO3, 27.20 g / L Mo, and a Mo / WO3 mass ratio of 4.63.

[0072] Extraction separation: The organic phase and aqueous phase were mixed and shaken at room temperature for 25 minutes at a ratio of 2:1, and the extraction level was 1. After stopping, centrifugation was performed for 8 minutes at a centrifugal speed of 4000r / min, and then the organic phase and the aqueous phase were separated. The loaded organic phase was stripped with 0.10mol / LNaHCO3, the stripping ratio was 1:1, and the stripping time was 15 minutes.

[0073] Results: WO35.77 g / L and Mo8.17 g / L in the raffinate were determined, with a separation factor of 134.40. WO30.05 g / L and Mo19.06 g / L in the stripping solution.

[0074] Example 8

[0075] Organic phase composition: [P66614][P204] concentration is 0.05 mol / L, and the diluent is cyclohexane.

[0076] Aqueous phase feed liquid: The prepared tungsten-molybdenum solution has a pH value of 9.8, which is adjusted to 1.8 with dilute sulfuric acid, and 30% hydrogen peroxide is added in an amount that is 1.5 times the total molar concentration of tungsten and molybdenum. Stir for 36 hours to obtain an extraction feed liquid containing 2.42g / LWO3, 28.28g / LMo, and a Mo / WO3 mass ratio of 11.68.

[0077] Extraction separation: The organic phase and aqueous phase were mixed and shaken at room temperature for 25 minutes at a ratio of 2:1, and the extraction level was 1. After stopping, centrifugation was performed for 8 minutes at a centrifugal speed of 4000r / min, and then the organic phase and the aqueous phase were separated. The loaded organic phase was stripped with 0.40mol / LNaHCO3, the stripping ratio was 1:1, and the stripping time was 15 minutes.

[0078] Results: WO32.32 g / L, Mo8.35 g / L in the raffinate were determined, with a separation factor of 55.37. WO30.08 g / L, Mo19.82 g / L in the stripping solution.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for extracting and separating tungsten and molybdenum from a tungsten and molybdenum solution using a functional ionic liquid, characterized in that: The following steps are involved: (1) adjusting the pH value of the tungsten-molybdenum mixed solution to 3-3.5, then adding hydrogen peroxide and stirring evenly, adjusting the pH value of the solution to 1.5-3 to obtain an aqueous phase feed solution; (2) The aqueous phase is treated with an organic phase, and molybdenum enters the organic phase, while tungsten remains in the raffinate, thereby achieving tungsten and molybdenum separation. The organic phase is composed of a quaternary phosphonium salt functional ionic liquid and a diluent; (3) The loaded organic phase is stripped with an alkaline solution to obtain a molybdenum-containing solution, and the stripped organic phase can be recycled after washing with water; The quaternary phosphonium salt functional ionic liquid is one of [P66614][P204], [P66614][P507], [P66614][CA-12], and [P66614][Cyanex272].

2. The method for extracting and separating tungsten and molybdenum from a tungsten and molybdenum solution using a functional ionic liquid according to claim 1, characterized in that: In the organic phase, the concentration of the quaternary phosphonium salt functional ionic liquid is 0.01-0.06 mol / L, and the diluent is cyclohexane.

3. The method for extracting and separating tungsten and molybdenum from a tungsten and molybdenum solution using a functional ionic liquid according to claim 1, characterized in that: In step (1), in the tungsten-molybdenum mixed solution, the WO3 concentration is 5-120 g / L, the Mo concentration is 3-30 g / L, and the WO3 / Mo mass ratio is 1:12-12:

1.

4. The method for extracting and separating tungsten and molybdenum from a tungsten and molybdenum solution using a functional ionic liquid according to claim 1, characterized in that: In step (1), the amount of hydrogen peroxide used is 1 to 2 times the sum of the molar concentrations of tungsten and molybdenum, and the stirring time is 24 to 48 hours.

5. The method for extracting and separating tungsten and molybdenum from a tungsten and molybdenum solution using a functional ionic liquid according to claim 1, characterized in that: The preparation method of quaternary phosphonium salt functional ionic liquid comprises the following steps: 1) Slowly add metallic sodium to isopropanol and mix and stir to ensure that the sodium reacts completely to form sodium isopropoxide, thereby obtaining a sodium isopropoxide solution; 2) dissolving [P66614]Cl in isopropanol, and then adding dropwise to the sodium isopropoxide solution in step 1) to react to obtain a mixed solution, allowing the mixed solution to stand for solid-liquid separation, and then centrifuging to remove the generated white precipitate of sodium chloride, and mixing the supernatant obtained by centrifugation with an equal volume of deionized water at room temperature to obtain [P66614][OH]; 3) [P66614][OH] is mixed with an extractant, heated and stirred, and then allowed to stand to separate an organic phase, and finally water and isopropanol in the organic phase are removed to obtain a quaternary phosphonium salt functional ionic liquid.

6. The method for extracting and separating tungsten and molybdenum from a tungsten and molybdenum solution using a functional ionic liquid according to claim 5, characterized in that: In step 3), the extractant is one of [P204], [P507], [CA-12], and [Cyanex272].

7. The method for extracting and separating tungsten and molybdenum from a tungsten and molybdenum solution using a functional ionic liquid according to claim 5, characterized in that: In step 3), the molar ratio of [P66614][OH] to the extractant is 1.1:

1.

8. The method for extracting and separating tungsten and molybdenum from a tungsten and molybdenum solution using a functional ionic liquid according to claim 1, characterized in that: In step (3), the alkaline solution is one of sodium hydroxide, ammonia water, and sodium bicarbonate; and the molar concentration of the alkaline solution is 0.1 to 1 mol / L.

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