Vanadium liquid extraction agent and application thereof

Abstract

The invention relates to the technical field of C22B34 / 22, in particular to a vanadium liquid extraction agent and application thereof.The preparation raw materials of the vanadium liquid extraction agent at least comprise organophosphorus ester, organic amine and a diluent, the mass ratio of the organophosphorus ester to the organic amine to the diluent is (2-4): (1-5): (5-10), by optimizing a vanadium liquid extraction agent formula system, the number of extraction stages of tetravalent vanadium ions in vanadium-containing feed liquid is greatly reduced, and the vanadium liquid extraction efficiency is improved. More than 99.5% of impurities in the vanadium-containing feed liquid can be isolated without additionally adding an impurity removal agent or sodium hydroxide, and a preparation method with low cost and simple process flow is provided for the vanadium electrolyte.

Description

Technical Field

[0001] The invention relates to the technical field of C22B34 / 22, in particular to a vanadium liquid extractant and application thereof. Background Art

[0002] At present, the method for preparing vanadium electrolyte is to use ammonium metavanadate or vanadium pentoxide to prepare high-purity vanadium pentoxide, and then prepare electrolyte by methods such as low-temperature dissolution reduction, electrolysis, high-temperature reduction dissolution of high-purity vanadium pentoxide, but the overall process is complicated and the cost is high. Chinese patent (publication number is CN115441029A) discloses a vanadium electrolyte and its preparation method and application, which requires adding multiple impurity removers to remove impurities and then reducing and extracting, and the process flow is complicated and the cost is high. Therefore, it is urgent to develop a low-cost and simple process flow method for preparing vanadium electrolyte. Purification optimization based on vanadium-containing solution is one of the effective ways. Vanadium-containing solution is usually purified by extraction-strip extraction technology, but the purification process based on different extraction mechanisms still has many problems such as low extraction efficiency, complex process flow, high cost, and high three wastes. A Chinese patent (authorization announcement number CN113604685B) discloses a method for preparing vanadium oxide from a vanadium-containing solution, which first uses sodium hydroxide to adjust the pH value, then adds a kerosene solution of P204 or P507 as an extractant for extraction, and finally uses sulfuric acid as a stripping agent for stripping, the purpose of which is to solve the problems of low impurity removal rate and long process, but its purification method requires continuous consumption of sodium hydroxide and production of sodium sulfate, which is costly and high in waste, and is not easy to promote large-scale industrial application. The vanadium slag roasting and leaching method disclosed in the Chinese patent (CN 114959251 B) discloses the use of P204 according to the O / A (extraction phase ratio: organic phase volume / aqueous phase volume) of 1:5 for 5 extractions, with many extraction stages and low extraction efficiency. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a vanadium liquid extractant, which greatly reduces the extraction level of tetravalent vanadium ions in the vanadium-containing liquid by optimizing the formula system of the vanadium liquid extractant, and can isolate more than 99.5% of impurities in the vanadium-containing liquid without the need to add additional impurity removers or sodium hydroxide, thereby providing a low-cost and simple process preparation method for vanadium electrolyte.

[0004] On one hand, the present invention provides a vanadium liquid extractant, the raw materials for preparing the vanadium liquid extractant at least include the following components: organic phosphate ester, organic amine, and diluent, wherein the mass ratio of the organic phosphate ester, organic amine, and diluent is (2-4): (1-5): (5-10).

[0005] As a preferred technical solution, the organic phosphate is selected from at least one of P507, P204, and Cyanex272, preferably P507 or P204.

[0006] As a preferred technical solution, the organic amine at least includes a fatty tertiary amine.

[0007] As a preferred technical solution, the structural formula of the fatty tertiary amine is N-R3, R is C5-C 10 Straight chain alkyl.

[0008] As a preferred technical solution, the fatty tertiary amine is tri-n-octylamine (TOA, CAS No. 1116-76-3) or tri-octyl-decyl tertiary amine (CAS No. 68814-95-9).

[0009] As a preferred technical solution, the diluent is selected from at least one of sulfonated kerosene, petroleum ether, toluene, n-octanol, benzene, chloroform, and 2-ethylhexanol, preferably sulfonated kerosene.

[0010] As a preferred technical solution, the mass ratio of the organic phosphate ester, the organic amine and the diluent is 3:(1-5):7, preferably 3:(3-5):7.

[0011] The vanadium liquid extractant provided by the present invention effectively overcomes the problems of low extraction efficiency, complex process flow, high cost and high three wastes in the existing process by compounding P507 or P204 with fatty tertiary amine according to a ratio and then diluting it with sulfonated kerosene to a specific concentration, and is easy to realize large-scale industrial promotion and application. In particular, the vanadium liquid extractant is a compound combination of P507 or P204 with tri-n-octylamine and sulfonated kerosene in a mass ratio of 3: (3-5): 7, which effectively isolates 1-5wt% of 4-valent vanadium ions in the vanadium-containing liquid from impurities such as sodium, magnesium, silicon, calcium, etc., and can achieve an extraction rate of ≥99.0% by continuous extraction 2-3 times.

[0012] Another aspect of the present invention provides an application of a vanadium liquid extractant, which is applied to the extraction of tetravalent vanadium ions in a vanadium-containing feed liquid. The method for extracting tetravalent vanadium ions in a vanadium-containing feed liquid comprises at least the following steps:

[0013] (1) Extraction: adding a vanadium liquid extractant to the vanadium-containing liquid, and extracting continuously for 2-10 times to obtain an extract phase;

[0014] (2) Stripping: Stripping the extract phase with aqueous sulfuric acid to obtain a high-purity tetravalent vanadium ion solution.

[0015] As a preferred technical solution, the volume ratio of the vanadium-containing liquid to the vanadium liquid extractant is (0.5-2):1, preferably 1:1.

[0016] As a preferred technical solution, the concentration of the aqueous sulfuric acid solution is 1.5-3 mol / L, and the temperature of the stripping is 50-70°C.

[0017] As a preferred technical solution, the concentration of tetravalent vanadium ions in the vanadium-containing liquid is 1-5wt%.

[0018] As a preferred technical solution, the vanadium-containing liquid further includes sodium ions, magnesium ions, silicon ions and calcium ions.

[0019] As a preferred technical solution, the concentration of tetravalent vanadium ions in the vanadium-containing liquid is 1.8wt%, the concentration of sodium ions is 43722.74mg / L, the concentration of magnesium ions is 1374.74mg / L, the concentration of silicon ions is 975.4mg / L, the concentration of calcium ions is 712.16mg / L, and the balance is water.

[0020] The vanadium liquid extractant provided by the present invention can be reused, and can maintain a relatively high extraction efficiency during the reuse process. The extraction rate after repeated reuse is still maintained at more than 99.5%, and has extremely high economic efficiency.

[0021] A high-purity tetravalent vanadium ion solution can be obtained by performing an extraction-strip extraction process on a vanadium-containing liquid using the vanadium liquid extractant provided by the present invention. The high-purity tetravalent vanadium ion solution can be evaporated, concentrated, and charged and electrolyzed to prepare a vanadium electrolyte product.

[0022] Beneficial Effects

[0023] 1. The present invention provides a vanadium liquid extractant. By optimizing the formula system of the vanadium liquid extractant, the extraction level of tetravalent vanadium ions in the vanadium-containing liquid is greatly reduced. More than 99.5% of impurities in the vanadium-containing liquid can be isolated without the need for additional impurity removers or sodium hydroxide, thereby providing a low-cost and simple process preparation method for vanadium electrolyte.

[0024] 2. The vanadium liquid extractant provided by the present invention is prepared by compounding P507 or P204 with a fatty tertiary amine according to a ratio and then diluting the mixture with sulfonated kerosene to a specific concentration, thereby effectively overcoming the problems of low extraction efficiency, complex process flow, high cost and high waste in the existing process, and is easy to realize large-scale industrial promotion and application.

[0025] 3. The present invention adopts a vanadium liquid extractant prepared by compounding P507 or P204 with tri-n-octylamine and sulfonated kerosene in a mass ratio of 3:(3-5):7, which can effectively isolate 1-5wt% of quadrivalent vanadium ions in the vanadium-containing liquid from impurities such as sodium, magnesium, silicon, and calcium. Continuous extraction for 2-3 times can achieve an extraction rate of ≥99.0%.

[0026] 4. The vanadium liquid extractant provided by the present invention can be reused, and the vanadium liquid extractant can maintain a high extraction efficiency during the reuse process. The extraction rate after multiple reuses is still maintained at more than 99.5%, which has extremely high economic efficiency.

[0027] 5. A high-purity tetravalent vanadium ion solution can be obtained by using the vanadium liquid extractant provided by the present invention to extract and strip the vanadium-containing liquid. The high-purity tetravalent vanadium ion solution can be evaporated, concentrated, and charged and electrolyzed to prepare a vanadium electrolyte product. DETAILED DESCRIPTION

[0028] Example 1

[0029] Example 1 of the present invention provides a vanadium liquid extractant, and the raw materials for preparing the vanadium liquid extractant include the following components: an organic phosphate ester, an organic amine, and a diluent, wherein the mass ratio of the organic phosphate ester, the organic amine, and the diluent is 3:3:7.

[0030] The organic phosphate is P507.

[0031] The organic amine is tri-n-octylamine (TOA, CAS No. 1116-76-3).

[0032] The diluent is sulfonated kerosene (260#).

[0033] Embodiment 1 of the present invention provides, on the other hand, a method for extracting tetravalent vanadium ions from a vanadium-containing liquid, comprising the following steps:

[0034] (1) Extraction: adding a vanadium liquid extractant to 200 mL of vanadium-containing feed liquid, extracting continuously for 3 times at 25±5° C., the first extraction rate was 73.6%, the second total extraction rate was 98.6%, and the total extraction rate after 3 extractions was 99.5%. The content of tetravalent vanadium ions in the raffinate after 3 extractions was 0.016 wt%, to obtain an extract phase;

[0035] (2) Stripping: The extract phase is stripped with aqueous sulfuric acid solution, with a stripping rate of 99.5%. The concentrations of sodium ions, magnesium ions, silicon ions and calcium ions in the stripping solution (high-purity tetravalent vanadium ion solution) are 15.12 mg / L, 2.42 mg / L, 1.71 mg / L and 3.45 g / L, respectively. The isolation rate of impurities in the vanadium-containing liquid after extraction-stripping is above 99.5%.

[0036] The concentration of tetravalent vanadium ions in the vanadium-containing liquid is 1.8wt%, the concentration of sodium ions is 43722.74mg / L, the concentration of magnesium ions is 1374.74mg / L, the concentration of silicon ions is 975.4mg / L, the concentration of calcium ions is 712.16mg / L, and the balance is water.

[0037] The volume ratio of the vanadium-containing liquid to the vanadium liquid extractant is 1:1.

[0038] The concentration of the aqueous sulfuric acid solution is 2 mol / L, and the temperature of the stripping is 60°C.

[0039] Example 2

[0040] Embodiment 2 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of embodiment 1, except that the mass ratio of the organic phosphate, the organic amine, and the diluent is 3:5:7. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0041] (1) Extraction: adding a vanadium liquid extractant to 200 mL of vanadium-containing feed liquid, extracting twice continuously at 25±5° C., wherein the first extraction rate was 84.2%, the second total extraction rate was 99.0%, and the content of tetravalent vanadium ions in the raffinate after the two extractions was 0.053 wt %, to obtain an extract phase;

[0042] (2) Stripping: The extract phase was stripped with aqueous sulfuric acid solution, with a stripping rate of 99.5%. The concentrations of sodium ions, magnesium ions, silicon ions and calcium ions in the stripping solution were detected to be 11.24 mg / L, 1.94 mg / L, 1.83 mg / L and 3.45 mg / L, respectively. The isolation rate of impurities in the vanadium-containing liquid after extraction-stripping was above 99.5%.

[0043] Example 3

[0044] Embodiment 3 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of embodiment 1, except that the mass ratio of the organic phosphate, the organic amine, and the diluent is 3:1:7. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0045] (1) Extraction: adding a vanadium liquid extractant to 200 mL of vanadium-containing liquid, extracting continuously for 6 times at 25±5° C., the first extraction rate was 28.8%, the second total extraction rate was 46.6%, and the total extraction rate after 6 extractions was 99.2%. The content of tetravalent vanadium ions in the raffinate after 6 extractions was 0.046 wt%, to obtain an extract phase;

[0046] (2) Stripping: The extract phase was stripped with aqueous sulfuric acid solution, with a stripping rate of 99.5%. The concentrations of sodium ions, magnesium ions, silicon ions and calcium ions in the stripping solution were detected to be 21.24 mg / L, 2.56 mg / L, 1.66 mg / L and 2.93 mg / L, respectively. The isolation rate of impurities in the vanadium-containing liquid after extraction-stripping was above 99.5%.

[0047] Example 4

[0048] Embodiment 4 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of embodiment 1, except that the P507 is replaced by P204. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0049] (1) Extraction: adding a vanadium liquid extractant to 200 mL of vanadium-containing liquid, extracting continuously for 3 times at 25±5° C., the first extraction rate was 72.8%, the second total extraction rate was 97.5%, and the total extraction rate after 3 extractions was 99.4%. The content of tetravalent vanadium ions in the raffinate after 3 extractions was 0.023 wt%, and an extract phase was obtained;

[0050] (2) Stripping: The extract phase was stripped with aqueous sulfuric acid solution, with a stripping rate of 99.5%. The concentrations of sodium ions, magnesium ions, silicon ions and calcium ions in the stripping solution were detected to be 16.47 mg / L, 2.21 mg / L, 1.44 mg / L and 2.36 mg / L, respectively. The isolation rate of impurities in the vanadium-containing liquid after extraction-stripping was more than 99.5%.

[0051] Example 5

[0052] Example 5 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of Example 1, except that the method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0053] (1) Extraction: Add a vanadium liquid extractant to 100 mL (108.1 g) of vanadium-containing liquid, and extract three times continuously at 25±5° C. After the first extraction, 101.7 g of raffinate (the content of tetravalent vanadium ions is 0.5456 wt%) is obtained, and the extraction rate is 72.4%; after the second extraction, 95.6 g of raffinate (the content of tetravalent vanadium ions is 0.0545 wt%) is obtained, and the total extraction rate is 97.4%; after a total of three extractions, 92.5 g of raffinate (the content of tetravalent vanadium ions is 0.01165 wt%) is obtained, and the total extraction rate is 99.3%, and an extract phase is obtained;

[0054] (2) Stripping: The extract phase was stripped with aqueous sulfuric acid solution for 4 times (125 mL each time), with a stripping rate of 99.5%, and a total of 570 g of stripping solution was obtained. The content of tetravalent vanadium ions in the stripping solution was detected to be 0.3357 wt%, the purity of vanadium oxysulfate was 99.986%, and the stripping rate was 99.5%. The concentrations of sodium ions, magnesium ions, silicon ions, and calcium ions in the stripping solution were detected to be 15.36 mg / L, 2.46 mg / L, 1.65 mg / L, and 2.33 mg / L, respectively. The isolation rate of impurities in the vanadium-containing feed solution after extraction-stripping was more than 99.5%.

[0055] (3) The extract phase after stripping was used for extraction with the vanadium-containing feed liquid, and the extract phase after stripping was used for extraction with the vanadium-containing feed liquid, and the extract phase was O / A=1. After three consecutive extractions, the vanadium content in the raffinate was detected and the total extraction rate was calculated. Then, the extract phase was extracted with a 2 mol / L sulfuric acid solution, and the extract phase after stripping continued to extract the vanadium-containing feed liquid. The vanadium liquid extractant was repeatedly used for 8 times, and the total extraction rate after three consecutive extractions after the application was calculated. The results are shown in Table 1.

[0056] Table 1

[0057]

[0058] According to data analysis, the extraction efficiency of the extraction agent is advanced through repeated use. The quality of the raffinate remains almost unchanged after eight cycles, that is, TOA is not consumed during the process (conventional NaOH will continue to consume), and the extraction rate remains above 99.5% after multiple extractions.

[0059] Example 6

[0060] Embodiment 6 of the present invention provides a vanadium liquid extractant and its application, comprising the following steps:

[0061] (1) Multi-stage countercurrent extraction: The vanadium-containing feed liquid (same as in Example 1) and the vanadium liquid extractant (same as in Example 1) were subjected to a three-stage countercurrent extraction device at a ratio of 1:1. After the two phases were balanced, the raffinate containing 0.015845 wt% vanadium and the vanadium-carrying extract phase containing 2.1956 wt% vanadium were obtained.

[0062] (2) Multi-stage countercurrent stripping: 1.5 mol / L sulfuric acid aqueous solution and a 4-stage countercurrent extraction device are used to extract the vanadium-loaded extract phase. The stripping temperature is 60°C, and the ratio O / A is 2. After the two phases are balanced, an extractant with a vanadium content of 0.0243% (recycled) and an aqueous solution of vanadyl sulfate with a vanadium content of 3.8425 wt% (high-purity tetravalent vanadium ion solution) are obtained.

[0063] (3) Concentration: The vanadyl sulfate solution with a vanadium content of 3.8425 wt% is subjected to reduced pressure distillation to remove water, and then the residual extractant is adsorbed by activated carbon. The sample is sent for testing to obtain a qualified vanadium electrolyte product.

[0064] Comparative Example 1

[0065] Comparative Example 1 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of Example 1, except that its preparation raw materials include the following components: an organic phosphate ester and a diluent, and the mass ratio of the organic phosphate ester to the diluent is 3:7. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0066] (1) Extraction: Add a vanadium liquid extractant to 200 mL of vanadium-containing liquid, and extract continuously for 8 times at 25±5° C. The first extraction rate is 25.1%, the second total extraction rate is 30.1%, and the total extraction rate after 8 extractions is 57%. The content of tetravalent vanadium ions in the raffinate after 8 extractions is 0.9474 wt%, and an extraction phase is obtained, without performing a subsequent stripping step.

[0067] Comparative Example 2

[0068] Comparative Example 2 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of Example 1, except that its preparation raw materials include the following components: an organic phosphate ester and a diluent, and the mass ratio of the organic phosphate ester to the diluent is 3:7. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0069] (1) Extraction: A sodium hydroxide aqueous solution with a mass concentration of 30% was added to a vanadium liquid extractant for saponification, and then used to extract 200 mL of vanadium-containing liquid. The extraction was performed continuously for 8 times at 25±5° C. The first extraction rate was 45.1%, the second total extraction rate was 60%, and the total extraction rate after 8 extractions was 77.2%. The content of tetravalent vanadium ions in the raffinate after 8 extractions was 0.4940 wt%, and an extraction phase was obtained without performing a subsequent stripping step.

[0070] Comparative Example 3

[0071] Comparative Example 3 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of Example 1, except that TOA is replaced by TBP. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0072] (1) Extraction: Add a vanadium liquid extractant to 200 mL of vanadium-containing liquid, and extract continuously for 8 times at 25±5° C. The first extraction rate is 25.1%, the second total extraction rate is 30.4%, and the total extraction rate after 8 extractions is 73.1%. The content of tetravalent vanadium ions in the raffinate after 8 extractions is 0.4837 wt%, and an extraction phase is obtained, without performing a subsequent stripping step.

[0073] Comparative Example 4

[0074] Comparative Example 4 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of Example 1, except that its preparation raw materials include the following components: organic phosphate ester and organic amine, and the mass ratio of the organic phosphate ester to the organic amine is 5:5. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0075] (1) Extraction: A vanadium liquid extractant was added to 200 mL of vanadium-containing liquid. During the extraction process at 25±5° C., a black viscous material appeared and could not be effectively extracted. The subsequent stripping step was not performed.

[0076] Comparative Example 5

[0077] Comparative Example 5 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of Example 1, except that the mass ratio of the organic phosphate, the organic amine, and the diluent is 6:1:14. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0078] (1) Extraction: Add a vanadium liquid extractant to 200 mL of vanadium-containing liquid, and extract continuously for 8 times at 25±5° C. The first extraction rate is 21.2%, the second total extraction rate is 36.4%, and the total extraction rate after 8 extractions is 92.1%. The content of tetravalent vanadium ions in the raffinate after 8 extractions is 0.1427 wt%, and an extraction phase is obtained, without performing a subsequent stripping step.

[0079] Comparative Example 6

[0080] Comparative Example 6 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of Example 1, except that the organic amine is replaced by dodecanol. The mass ratio of the organic phosphate, dodecanol, and diluent is 3:1:6. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0081] (1) Extraction: Add vanadium liquid extractant to 200 mL of vanadium-containing liquid, and perform extraction at 25±5° C. After the first extraction, the content of tetravalent vanadium ions in the raffinate was 1.1407 wt %, the extraction rate was 22%, and the total extraction rate of the second extraction was 31.3%. The extraction rate of a single batch was too low and no subsequent extraction was performed.

[0082] Comparative Example 7

[0083] Comparative Example 7 of the present invention provides a vanadium liquid extractant, and its specific implementation is the same as that of Example 1, except that the organic amine is replaced by isobutyl ketone. The mass ratio of the organic phosphate, isobutyl ketone, and diluent is 3:1:6. The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises the following steps:

[0084] (1) Extraction: Add vanadium liquid extractant to 200 mL of vanadium-containing liquid, and perform extraction at 25±5° C. After the first extraction, the content of tetravalent vanadium ions in the raffinate was 1.1462 wt %, the extraction rate was 23.3%, and the total extraction rate of the second extraction was 30.6%. The extraction rate of a single batch was too low and no subsequent extraction was performed.

Claims

1. A vanadium liquid extractant, characterized in that: The raw materials for its preparation at least include the following components: organic phosphate, organic amine and diluent, and the mass ratio of the organic phosphate, organic amine and diluent is (2-4): (1-5): (5-10).

2. The vanadium liquid extractant according to claim 1, characterized in that: The organic phosphate is selected from at least one of P507, P204 and Cyanex272.

3. The vanadium liquid extractant according to claim 2, characterized in that: The organic amine at least includes a tertiary fatty amine.

4. The vanadium liquid extractant according to claim 3, characterized in that: The structural formula of the fatty tertiary amine is N-R3, R is C5-C 10 Straight chain alkyl.

5. The vanadium liquid extractant according to claim 4, characterized in that: The diluent is selected from at least one of sulfonated kerosene, petroleum ether, toluene, n-octanol, benzene, chloroform and 2-ethylhexanol.

6. The vanadium liquid extractant according to claim 5, characterized in that: The mass ratio of the organic phosphate, the organic amine and the diluent is 3:(1-5):

7.

7. Use of the vanadium liquid extractant according to any one of claims 1 to 6, characterized in that: Used for the extraction of tetravalent vanadium ions in vanadium-containing liquid.

8. The use of the vanadium liquid extractant according to claim 7, characterized in that: The method for extracting tetravalent vanadium ions from the vanadium-containing liquid comprises at least the following steps: (1) Extraction: adding a vanadium liquid extractant to the vanadium-containing liquid, and extracting continuously for 2-10 times to obtain an extract phase; (2) Stripping: Stripping the extract phase with aqueous sulfuric acid to obtain a high-purity tetravalent vanadium ion solution.

9. The use of the vanadium liquid extractant according to claim 8, characterized in that: The volume ratio of the vanadium-containing liquid to the vanadium liquid extractant is (0.5-2):

1.

10. The use of the vanadium liquid extractant according to claim 9, characterized in that: The high-purity tetravalent vanadium ion solution is used for preparing vanadium electrolyte products.

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