Method for enriching scandium from bayan obo tailings

Abstract

The invention discloses a method for enriching scandium from bayan obo tailings. The method for enriching scandium from bayan obo tailings disclosed by the invention comprises the following steps: carrying out flotation treatment on the bayan obo tailings to obtain flotation concentrate; the flotation concentrate is subjected to acid leaching treatment through strong acid, an acid leaching scandium solution is obtained, and the solid-to-liquid ratio of acid leaching treatment is 1: (4-8); the acid leaching scandium solution is subjected to extraction treatment, an organic phase extraction scandium solution is obtained, and the extraction phase ratio O / A of extraction treatment is 1: (0.5-4); and carrying out back extraction treatment on the organic phase extracted scandium solution to obtain an enriched scandium solution. Therefore, according to the method, a scandium-containing solution with relatively high purity can be prepared through a flotation-acid leaching-extraction-back extraction combined enrichment method; according to the method, through pre-flotation, the acid leaching efficiency can be improved, no roasting technology is adopted before acid leaching, and through the acid leaching and extraction combined method, the technological process is simple and efficient, environment friendliness is achieved, and low carbon and environment friendliness are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of hydrometallurgy, and in particular to a method for enriching scandium from Bayan Obo tailings. Background Art

[0002] Scandium, as the most dispersed element in the rare earth family, is an important strategic element and is known as the green energy technology metal of the 21st century. It is mainly used in aerospace, solid fuel cells, optics, medical devices, etc. The Bayan Obo Mine is a large-scale polymetallic co-existing deposit that has attracted worldwide attention. Among them, scandium resources are rich, with a proven reserve of 170,000 tons, accounting for a quarter of the total scandium resources in my country. In the many years of "iron-based, rare earth-based" mineral processing process of the Bayan Obo Mine, scandium has been dispersed into tailings at all levels. The content of scandium in the tailings accounts for about 50%, mainly concentrated in gangue minerals such as silicate minerals and carbonate minerals. Therefore, the Bayan Obo tailings are high-quality raw materials for extracting scandium. However, the current methods for extracting scandium from the Bayan Obo tailings have problems such as low extraction efficiency, high energy consumption, and high pollution.

[0003] Therefore, the current method of enriching scandium from Bayan Obo tailings still needs to be improved. Summary of the invention

[0004] The embodiments of the present disclosure provide a method for enriching scandium from Bayan Obo tailings to solve or alleviate one or more technical problems in related technologies.

[0005] As a first aspect of the disclosed embodiment, the present application provides a method for enriching scandium from the Bayan Obo tailings, the method comprising the following steps: flotation treatment of the Bayan Obo tailings to obtain a flotation concentrate; acid leaching of the flotation concentrate to obtain an acid-leached scandium solution; extraction treatment of the acid-leached scandium solution with an organic solvent to obtain an organic phase-extracted scandium solution; back-extraction treatment of the organic phase-extracted scandium solution with water to obtain an enriched scandium solution. The method has the advantages of being environmentally friendly, low energy consumption, and high extraction rate.

[0006] Specifically, the method comprises the following steps: flotation treatment of the Bayan Obo tailings to obtain a flotation concentrate, wherein the flotation reagent comprises a sodium carbonate solution, a water glass solution and an FP collector which are added in sequence; acid leaching treatment of the flotation concentrate with a strong acid to obtain an acid-leached scandium solution, wherein the solid-liquid ratio of the acid leaching treatment is 1:(4-8); extraction treatment of the acid-leached scandium solution with an organic solvent to obtain an organic phase extracted scandium solution, wherein the organic solvent used in the extraction treatment comprises at least one of tributyl phosphate and kerosene; the extraction phase ratio O / A of the extraction treatment is 1:(0.5-4); stripping treatment of the organic phase extracted scandium solution with water to obtain an enriched scandium solution, wherein the stripping treatment is carried out with an aqueous solution, and the extraction phase ratio O / A of the stripping treatment is 1:(0.5-2).

[0007] In some possible implementations, the Bayan Obo tailings include one or more of iron tailings, rare earth tailings, and niobium tailings obtained from the Bayan Obo mine after superconducting magnetic separation-step flotation.

[0008] In some possible embodiments, the flotation treatment further includes: adding the Bayan Obo tailings to a flotation tank, adding a flotation agent to the flotation tank and stirring to obtain a flotation pulp, wherein the mass concentration of the flotation pulp is 20%-50%; after stirring and aerating the flotation pulp, opening the scraper of the flotation machine, scraping out bubbles, and filtering the flotation concentrate and flotation tailings after flotation respectively; wherein the concentration of the sodium carbonate solution in the flotation agent is 2%, the concentration of the water glass solution is 4%, and the concentration of the FB collector is 2%, and the volume ratio of the sodium carbonate solution, the water glass solution and the FP collector in the flotation tank is 2:1:2.6.

[0009] In some possible implementations, after the flotation treatment, the scandium grade in the flotation concentrate is increased by 30-60% compared with the Bayan Obo tailings.

[0010] In some possible implementations, the temperature of the acid leaching treatment is 140-220° C., the time of the acid leaching treatment is 1-8 h, the acid used in the acid leaching treatment includes hydrochloric acid, and the concentration of the hydrochloric acid is 4-12 mol / L.

[0011] In some possible implementations, after the acid leaching treatment, the leaching rate of scandium in the acid leaching scandium solution is not less than 96%, and the grade of scandium in the acid leaching scandium solution is increased by 120-180% compared with the Bayan Obo tailings.

[0012] In some possible implementations, the acid-leached scandium solution and leached residue are obtained after the acid leaching treatment, and the grade of SiO2 in the leached residue is not less than 75%.

[0013] In some possible implementations, the extraction treatment further comprises: washing with concentrated hydrochloric acid after extraction and phase separation to obtain the organic phase extracted scandium solution;

[0014] The stripping treatment is carried out using distilled water at 20-50°C.

[0015] In some possible implementations, the extraction rates of the extraction treatment and the stripping treatment are not less than 98%, and the stripping rate is not less than 97%.

[0016] In some possible implementations, the method further comprises the following steps:

[0017] Add the Bayan Obo tailings to the flotation tank, then add water to the 4 / 5 mark of the flotation tank, and stir for two minutes; then add the sodium carbonate solution to the flotation tank, stir for 5 minutes; then add the water glass solution, stir for 5 minutes; then add the FP collector, and stir for 5 minutes; wherein the volume ratio of the sodium carbonate solution, the water glass solution and the FP collector added to the flotation tank is 2:1:2.6, and the flotation pulp with a mass concentration of 30% is obtained, and then stir for 5 minutes; then add water to the level of the scale line; after aerating the flotation pulp, open the scraper of the flotation machine, scrape for 2 minutes, scrape out bubbles, and filter the flotation concentrate and flotation tailings after flotation respectively;

[0018] The flotation concentrate and 12 mol / L hydrochloric acid are mixed at a solid-liquid ratio of 1:6 to obtain a mixture; the mixture is added to a hydrothermal reactor and acid-leached in a drying oven at a temperature of 180° C. for 6 hours and then taken out; the acid-leached material is vacuum-filtered to achieve solid-liquid separation to obtain the acid-leached scandium solution;

[0019] The acid-leached scandium solution is subjected to the extraction treatment using a mixture of tributyl phosphate and kerosene in a volume ratio of 1:1 as the organic solvent, and hydrochloric acid is added to the acid-leached scandium solution to adjust the acidity of the acid-leached scandium solution to 4.5-9.5 mol / L; extraction and phase separation are performed with an extraction phase O / A ratio of 1:0.5, and then washing with concentrated hydrochloric acid to obtain the organic phase extracted scandium solution;

[0020] The stripping treatment is carried out using distilled water at a temperature of 50° C. and an extraction phase ratio O / A of 1:2 to obtain the scandium-enriched solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0022] Figure 1 Schematic diagram of a method for enriching scandium from Bayan Obo tailings in some embodiments of the present application;

[0023] Figure 2 This is a schematic flow chart of the method for enriching scandium from Bayan Obo tailings in some embodiments of the present application. DETAILED DESCRIPTION

[0024] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure, and different embodiments may be combined arbitrarily without conflict. Therefore, the drawings and descriptions are considered to be illustrative in nature and not restrictive.

[0025] As the first aspect of the embodiments of the present disclosure, the present application provides a method for enriching scandium from Bayan Obo tailings. The method can produce a scandium-containing solution with higher purity through a combined enrichment method of flotation-acid leaching-extraction-strip extraction; and the method can improve the acid leaching efficiency through pre-flotation, and there is no roasting process before acid leaching. The process flow of the combined acid leaching and extraction method is simple and efficient, and is more environmentally friendly and low-carbon and environmentally friendly.

[0026] The current methods for extracting scandium from the Bayan Obo tailings have problems such as low extraction purity, high energy consumption, and high pollution. For example, some literatures use roasting-acid leaching and other methods to extract scandium. The leaching rate of the above methods is low, and scandium cannot be effectively separated from impurity ions such as Fe, Ca, and Mg. In addition, the high-temperature carbon roasting process consumes a lot of energy and produces CO2, SO2, and NO. x The inventors have designed the combined enrichment method of flotation-acid leaching-extraction-strip extraction in this application through in-depth research, referring to Figure 2The method has the following advantages: (1) The method can float out impurities such as fluorite and dolomite through pre-flotation, which not only improves the grade of scandium in the tailings, but also avoids the influence of these impurities on the acid leaching efficiency during acid leaching, that is, it can improve the acid leaching efficiency; and after removing some impurities through pre-flotation, the amount of acid used in subsequent acid leaching treatment is reduced, which is energy-saving and environmentally friendly; and the floated fluorite and dolomite can be used in the industrial production of fluorine chemical industry, refractory bricks, etc.; (2) The method directly performs acid leaching after flotation, that is, acid There is no roasting process before leaching, so the method has low energy consumption, less pollution, and is more environmentally friendly; and the silicon content in the waste slag after acid leaching is very high, and the silicon grade in the waste slag is not less than 75%, so the waste slag can be used to produce industrial silicon products; (3) The method uses a process combining roasting-extraction-strip extraction, and the process is simple and efficient. The scandium purity in the formed enriched scandium solution is high; and the acid used in the extraction, washing and stripping process can be reused in the acid leaching process, without generating acid waste liquid, so that resources are recycled and low-carbon and environmentally friendly.

[0027] According to the embodiments of the present application, reference Figure 1 , the method comprising:

[0028] S100: flotation treatment to obtain flotation concentrate

[0029] In this step, the Bayan Obo tailings are subjected to flotation treatment to obtain a flotation concentrate. In some possible embodiments, the Bayan Obo tailings may include one or more of iron tailings, rare earth tailings, and niobium tailings after superconducting magnetic separation-step flotation of the Bayan Obo mine. In some possible embodiments, the scandium grade in the Bayan Obo tailings may not be greater than 300ppm, for example, may be 260ppm, etc.

[0030] In some possible implementations, the flotation process may further include:

[0031] (1) Add the Bayan Obo tailings to a flotation tank, add a flotation agent to the flotation tank and stir to obtain a flotation pulp, the mass concentration of the flotation pulp is 20%-50%, for example, 30%, 40%, etc. Specifically, the flotation agent may include a sodium carbonate solution, a water glass solution and a FP collector added in sequence, the concentration of the sodium carbonate solution may be 2%, the concentration of the water glass solution may be 4%, and the concentration of the FP collector may be 2%; specifically, the volume ratio of the sodium carbonate solution, the water glass solution and the FP collector added to the flotation tank is 2:1:2.6. Therefore, when the mass ratio of the flotation agent is within the above range, the flotation separation of materials with higher floatability can be better promoted.

[0032] In some specific embodiments, the Bayan Obo tailings can be added to a flotation cell, and then water is added to the 4 / 5 scale line of the flotation cell and stirred for two minutes; then a sodium carbonate solution is added to the flotation cell and stirred for 5 minutes; then a water glass solution is added and stirred for 5 minutes; then an FP collector is added and stirred for 5 minutes to form a flotation slurry, and then water is added until the scale line of the flotation cell is level.

[0033] (2) After the flotation slurry formed in the previous step is stirred and aerated, the scraper of the flotation machine is opened to scrape out the bubbles and filter the flotation concentrate and flotation tailings after flotation respectively.

[0034] According to the embodiment of the present application, after the above flotation treatment, the scandium grade in the flotation concentrate can be increased by 30-60% compared with the Bayan Obo tailings, for example, by 40%, 50%, etc. Specifically, after the flotation treatment, the scandium grade in the flotation concentrate can be not less than 410ppm, etc.

[0035] S200: Acid leaching is performed to obtain an acid leached scandium solution

[0036] In this step, the flotation concentrate obtained by flotation treatment in the previous step is subjected to acid leaching treatment to obtain an acid-leached scandium solution. According to some embodiments of the present application, the temperature of the acid leaching treatment can be 140-220°C, for example, 150°C, 160°C, 180°C, 200°C, 210°C, etc. When the acid leaching treatment is at the above temperature, scandium can be leached well. Specifically, the time of the acid leaching treatment can be 1-8h, for example, 2h, 3h, 4h, 5h, 6h, 7h, etc. In some possible embodiments, the solid-liquid ratio of the acid leaching treatment can be 1: (4-8), for example, 1: 5, 1: 6, 1: 7, etc. When the solid-liquid ratio of the acid leaching treatment is within the above range, scandium can be leached well: at a certain leaching agent concentration, a large liquid-solid ratio can reduce the viscosity of the ore pulp and the concentration of valuable metal ions in the leachate, which is conducive to increasing the mass transfer rate between the solid and liquid phases, thereby increasing the leaching rate. However, if the liquid-solid ratio is too large, it will increase the load of the leaching and liquid-solid separation equipment or the loss of the leaching agent, which may not be economically beneficial. Specifically, the acid used in the acid leaching treatment may include hydrochloric acid, and the concentration of the hydrochloric acid may be 4-12 mol / L, for example, 5 mol / L, 6 mol / L, 8 mol / L, 9 mol / L, 10 mol / L, etc.

[0037] In some possible embodiments, after acid leaching treatment, the leaching rate of scandium in the acid leaching scandium solution is not less than 96%, for example, it can be 97%, it can be 98%, etc.; in some possible embodiments, the grade of scandium in the acid leaching scandium solution can be increased by 120-180% compared with the Bayan Obo tailings, for example, after acid leaching treatment, the grade of scandium in the acid leaching scandium solution can be not less than 680ppm, etc.

[0038] According to some embodiments of the present application, an acid-leached scandium solution and leached residue are obtained after acid leaching, the leached residue is rich in silicon, and the grade of SiO2 in the leached residue is not less than 75%, for example, it can be 80%, 85%, etc. The silicon content in the waste residue after acid leaching is very high, and the silicon grade in the waste residue is not less than 75%, so the waste residue can be used to produce industrial silicon products.

[0039] S300: Extraction treatment is performed to obtain an organic phase extracted scandium solution

[0040] In this step, the acid-leached scandium solution is subjected to extraction treatment using an organic solvent to obtain an organic phase extracted scandium solution. In some possible embodiments, the organic solvent used for the extraction treatment may include at least one of tributyl phosphate and kerosene. Specifically, the organic solvent may be a mixture of tributyl phosphate and kerosene, and the volume fraction of tributyl phosphate may be 10-100%, for example, 30%, 40%, 50%, 60%, 80%, etc. In some possible embodiments, the extraction phase ratio O / A of the extraction treatment may be 1:(0.5-4), for example, 1:1, 1:2, 1:3, etc. Thus, when the O / A ratio is within the above range, scandium can be extracted better. In the extraction ratio within the above range, the aqueous phase can be fully mixed with the organic phase and better play a mass transfer role, so that scandium is more conducive to being extracted into the organic phase.

[0041] In some possible implementations, the extraction treatment may further include: washing with concentrated hydrochloric acid after extraction and phase separation, and Fe etc. may be removed during the washing process, and specifically, the washing may be performed 3 times, etc. The Fe removal rate may reach more than 99%.

[0042] Specifically, the hydrochloric acid used in the extraction and washing in this step can be recycled and further used in the previous acid leaching step, with high acid utilization rate, high resource utilization efficiency, and low carbon and environmental protection.

[0043] S400: Perform stripping treatment to obtain a scandium-enriched solution

[0044] In this step, the organic phase extracted scandium solution obtained after extraction in the previous step is stripped with water to obtain an enriched scandium solution. In some possible embodiments, the stripping treatment can be carried out with distilled water at 20-50° C., and the extraction phase ratio O / A of the stripping treatment can be 1:(0.5-2), for example, 1:1, 1:1.5, etc.

[0045] In some possible implementations, the extraction rate after the extraction and stripping treatment in the previous steps may be no less than 98%, for example, 99.2%; the stripping rate may be no less than 97%, etc. Thus, after being treated by the method in the embodiment of the present application, the scandium-enriched solution has high purity and high extraction efficiency.

[0046] Hereinafter, the embodiments of the present application will be described. The embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If no specific techniques or conditions are indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be obtained commercially.

[0047] Example 1

[0048] (1) The tailings of the main east mine of Baiyunebo after superconducting-step flotation treatment were selected as the tailings of Baiyunebo, and the tailings of niobium were subjected to flotation experiment treatment. The process parameters of flotation treatment were as follows: 150g of niobium tailings (scandium grade 265.93ppm) were weighed and poured into the flotation tank, and then water was added to the scale line 4 / 5, and the main shaft was turned on for stirring for two minutes; 20mL Na2CO3 (2% concentration), 10mL Na2SiO3 (4% concentration), and 26mL FP collector (2% concentration) were added in sequence and stirred to form a flotation pulp with a concentration of 40%; after completing the above experimental process, water was added to be parallel to the scale line; after the flotation pulp was aerated, the scraper of the flotation machine was turned on to scrape out bubbles and filter the flotation concentrate and flotation tailings after flotation. Dry the sample and then conduct inspection. After inspection, the grade of scandium in the flotation concentrate increased from the original 265.93ppm to 410.65ppm.

[0049] (2) Take 30g of flotation concentrate and 12mol / L hydrochloric acid at a solid-liquid ratio of 1:6 and an acid leaching time of 6h for an acid leaching experiment. The material after acid leaching is vacuum filtered to obtain a scandium-rich acid leaching scandium solution and an acid leaching slag phase. The slag phase is tested by ICP, and the grade of scandium in the solution is calculated by subtraction. The leaching rate of scandium is 98.29%, and the grade of scandium is increased to 689.93ppm. The silicon-rich slag phase with a grade of 80% can be used to produce industrial silicon products, realizing resource utilization.

[0050] (3) Take the acid leaching solution formed in the previous step and perform an extraction experiment under the conditions of 50% tributyl phosphate (TBP) + 50% kerosene as the extractant, 6 min of oscillation time, 200 r / min of oscillation frequency, and 2:1 of O / A ratio. After ICP detection of the aqueous phase, the extraction rate was calculated to be 99.2% by subtraction method. The remaining liquid extracted can be added to the above acid leaching experiment to assist in acid leaching. This process does not generate waste liquid and is environmentally friendly and pollution-free.

[0051] (4) The extract produced in the above step was used to wash the organic phase after extraction with hydrochloric acid three times, and the ratio of the organic phase to the hydrochloric acid was 1:1. After the above step was completed, the separatory funnel was taken out and placed on the funnel holder, and it was left to stand for 2 hours. The separatory funnel valve was opened to take out the water phase and the oil phase, and the water phase was detected by ICP. The iron removal rate was calculated by subtraction method to be 99%.

[0052] (5) Take the extract formed in the above step and perform a stripping experiment with 50° C. distilled water at an O / A ratio of 1:2, an oscillation time of 6 min, and an oscillation frequency of 240 r / min. The scandium in the aqueous phase is tested by ICP, and the stripping rate is 97.2%.

[0053] The disclosure above provides many different embodiments or examples to implement different structures of the present disclosure. In order to simplify the present disclosure, the components and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0054] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A method for enriching scandium from Bayan Obo tailings, characterized in that: The steps include: The Bayan Obo tailings are subjected to flotation treatment to obtain a flotation concentrate, wherein the flotation reagent comprises a sodium carbonate solution, a water glass solution and an FP collector which are added in sequence; Using a strong acid, the flotation concentrate is subjected to acid leaching treatment to obtain an acid-leached scandium solution, wherein the solid-to-liquid ratio of the acid leaching treatment is 1:(4-8); The acid-leached scandium solution is subjected to extraction treatment using an organic solvent to obtain an organic phase extracted scandium solution, wherein the organic solvent used in the extraction treatment comprises at least one of tributyl phosphate and kerosene; and the extraction phase ratio O / A of the extraction treatment is 1: (0.5-4); The organic phase extracted scandium solution is subjected to back extraction treatment with water to obtain an enriched scandium solution, the back extraction treatment is carried out with an aqueous solution, and the extraction phase ratio O / A of the back extraction treatment is 1:(0.5-2).

2. The method according to claim 1, characterized in that The Bayan Obo tailings include one or more of iron tailings, rare earth tailings, and niobium tailings obtained after superconducting magnetic separation-step flotation of the Bayan Obo mine.

3. The method according to claim 1, characterized in that The flotation process further comprises: Adding the Bayan Obo tailings into a flotation tank, adding a flotation agent into the flotation tank and stirring the flotation slurry to obtain a flotation slurry, wherein the mass concentration of the flotation slurry is 20%-50%; After the flotation pulp is stirred and aerated, the scraper of the flotation machine is opened to scrape out the bubbles, and the flotation concentrate and flotation tailings after flotation are filtered respectively; Among them, the concentration of the sodium carbonate solution in the flotation reagent is 2%, the concentration of the water glass solution is 4%, the concentration of the FB collector is 2%, and the volume ratio of the sodium carbonate solution, the water glass solution and the FP collector in the flotation tank is 2:1:2.

6.

4. The method according to claim 3, characterized in that After the flotation treatment, the scandium grade in the flotation concentrate is increased by 30-60% compared with the Bayan Obo tailings.

5. The method according to claim 1, characterized in that The temperature of the acid leaching treatment is 140-220° C., the time of the acid leaching treatment is 1-8 hours, the acid used in the acid leaching treatment includes hydrochloric acid, and the concentration of the hydrochloric acid is 4-12 mol / L.

6. The method according to claim 5, characterized in that After the acid leaching treatment, the leaching rate of scandium in the acid leaching scandium solution is not less than 96%, and the grade of scandium in the acid leaching scandium solution is increased by 120-180% compared with the Bayan Obo tailings.

7. The method according to claim 5, characterized in that After the acid leaching treatment, the acid leached scandium solution and leached residue are obtained, and the grade of SiO2 in the leached residue is not less than 75%.

8. The method according to claim 1, characterized in that The extraction treatment further comprises: washing with concentrated hydrochloric acid after extraction and phase separation to obtain the organic phase extracted scandium solution; The stripping treatment is carried out using distilled water at 20-50°C.

9. The method according to claim 1, characterized in that: The extraction rates of the extraction treatment and the stripping treatment are not less than 98%, and the stripping rate is not less than 97%.

10. The method according to claim 1, characterized in that The steps include: Add the Bayan Obo tailings to the flotation tank, then add water to the 4 / 5 mark of the flotation tank, and stir for two minutes; then add the sodium carbonate solution to the flotation tank, stir for 5 minutes; then add the water glass solution, stir for 5 minutes; then add the FP collector, and stir for 5 minutes; wherein the volume ratio of the sodium carbonate solution, the water glass solution and the FP collector added to the flotation tank is 2:1:2.6, and the flotation pulp with a mass concentration of 30% is obtained, and then stir for 5 minutes; then add water to the level of the scale line; after aerating the flotation pulp, open the scraper of the flotation machine, scrape for 2 minutes, scrape out bubbles, and filter the flotation concentrate and flotation tailings after flotation respectively; The flotation concentrate and 12 mol / L hydrochloric acid are mixed at a solid-liquid ratio of 1:6 to obtain a mixture; the mixture is added to a hydrothermal reactor and acid-leached in a drying oven at a temperature of 180° C. for 6 hours and then taken out; the acid-leached material is vacuum-filtered to achieve solid-liquid separation to obtain the acid-leached scandium solution; The acid-leached scandium solution is subjected to the extraction treatment using a mixture of tributyl phosphate and kerosene in a volume ratio of 1:1 as the organic solvent, and hydrochloric acid is added to the acid-leached scandium solution to adjust the acidity of the acid-leached scandium solution to 4.5-9.5 mol / L; extraction and phase separation are performed with an extraction phase O / A ratio of 1:0.5, and then washing with concentrated hydrochloric acid to obtain the organic phase extracted scandium solution; The stripping treatment is carried out using distilled water at a temperature of 50° C. and an extraction phase ratio O / A of 1:2 to obtain the scandium-enriched solution.

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