Boron collecting agent and preparation method and application thereof

Abstract

The invention discloses a boron collecting agent and a preparation method and application thereof. The preparation method comprises the steps that an alkaline solution and a mixed solution at least containing magnesium salt, aluminum salt, a cis-hydroxyl compound and a surfactant are mixed and subjected to crystallization treatment, and the boron collecting agent is prepared; wherein the cis-hydroxyl compound comprises any one or a combination of more of glyceraldehyde, cane sugar, maltose, lactose, ribose, ketose, N-acetylglucosamine and Arabic gum. The modified hydrotalcite is regulated and controlled to serve as the boron collecting agent by combining the cis-hydroxyl compound with the surfactant, the boron collecting agent is not influenced by the pH value of a solution when being used for separating boron, and the boron collecting agent has the advantages of being easy and convenient to operate, low in cost, environmentally friendly, easy to amplify, wide in boron concentration application range, high in boron separation efficiency and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of boron separation, and specifically relates to a boron collector and a preparation method and application thereof. Background Art

[0002] At present, separating boron from solution is a complex and challenging task. In an aqueous solution environment, dissolved boron exists in various forms, and its specific form in water is affected by pH, total boron concentration, ionic strength, temperature, etc. Studies have shown that when the total boron concentration in the solution is lower than 0.025 mol / L, the boron in the solution mainly exists in the form of boric acid and borate ions. When the total boron concentration is higher than 0.025 mol / L, boron easily polymerizes in the solution to form polyborates. Low concentration boric acid is weakly acidic in aqueous solution, and its dissociation equation is: B(OH)3+ H2O ↔ B(OH)4 - + H + The p of boric acid at 25°C K a=9.2, when pH>9.2, boron exists in water mainly in the form of borate ions; when pH<9.2, it exists mainly in the form of boric acid. The actual pH of boric acid in solution is K a is easily affected by ionic strength. When there is a strong electrolyte in the solution, boron tends to exist in the form of borate. According to the different boron concentrations in the solution, some technologies currently need to combine multiple methods to achieve the purpose of separation.

[0003] In the comprehensive utilization of Qinghai Salt Lake resources, such as the process of lithium extraction from brine, boron in brine needs to be removed as an impurity. In the lithium extraction brine, due to the large number of impurity ions, including a high boron content, the boron removal effect will directly affect the crystallization performance of lithium chloride, which directly affects whether the product can be produced. When the boron content is high, it is easy to block the pipeline and cause serious corrosion to the equipment. Another reason is that the boron in the lithium chloride product mainly exists in the form of borate, which has a certain oxidizing property. In the electrolysis process, the addition of lithium chloride with a high boron content will passivate the electrode, thereby affecting the output and current efficiency of the electrolytic cell, and ultimately reducing the output of metallic lithium. In addition, in the production process of magnesium alloys of salt lake products, the presence of boron impurities will cause electrode passivation, affecting the quality and processing efficiency of subsequent deep processing products, and the impurity boron contained also needs to be removed. Therefore, the study of brine boron removal technology is crucial for the production of salt lake related products.

[0004] Up to now, the methods that have been studied more for the separation and recovery of boron in aqueous solution mainly include chemical precipitation, adsorption, extraction, ion exchange, electrodialysis, forward osmosis and reverse osmosis. Patent CN 114272643A discloses a synergistic extraction system and method for separating boron from magnesium-containing salt lake brine, including: adding a synergistic extraction system composed of monohydric fatty alcohol and ketone substances to extract boron from magnesium-containing salt lake brine, adjusting the pH of the brine, then adding the synergistic extraction system, and performing single-stage extraction or 2-6-stage countercurrent extraction at a certain temperature to obtain a boron-containing organic phase. Then, a single-stage stripping or 2-6-stage countercurrent stripping of the boron-containing organic phase at a certain temperature is performed using a stripping agent to obtain a boron-containing aqueous solution. The extraction rate of boron is generally high when an extractant is used to separate boron, but the extractant is prone to environmental pollution. Patent CN109205635A discloses a method for separating boron from boron-containing brine by nanofiltration. First, the pH of the boron-containing brine is adjusted, and then the brine is pumped into the nanofiltration system. Pressure is applied on both sides of the nanofiltration membrane to form a pressure difference. Part of the water, monovalent ions and a small amount of boron in the raw boron-containing brine migrate from the high-pressure side to the low-pressure side through the nanofiltration membrane. The boron on the high-pressure side is enriched due to the functional groups on the nanofiltration membrane, thereby obtaining boron-rich brine. However, its practical application faces considerable challenges, such as the high cost of membrane manufacturing and maintenance, high conductivity of wastewater, ion competitiveness, and the need to regularly replace electrodes. Therefore, it is an urgent problem to provide a new boron collector and a boron separation technology that is simple to operate, low in cost, green and environmentally friendly, and easy to scale up. Summary of the invention

[0005] The main purpose of the present invention is to provide a boron collector and a preparation method and application thereof, so as to overcome the problems of low separation efficiency, complex process, high cost and environmental pollution in the prior art of separating boron from boron-containing brine.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes: The embodiment of the present invention provides a method for preparing a boron collector, which comprises: mixing an alkaline solution with a mixed solution containing at least a magnesium salt, an aluminum salt, a cis-hydroxy compound, and a surfactant and performing a crystallization treatment to obtain a boron collector; The cis-hydroxy compound includes any one or more combinations of glyceraldehyde, sucrose, maltose, lactose, ribose, ketose, N-acetylglucosamine and gum arabic.

[0007] The embodiment of the present invention also provides a boron collector prepared by the aforementioned preparation method.

[0008] The embodiment of the present invention also provides the use of the aforementioned boron collector in the selective separation of boron.

[0009] An embodiment of the present invention also provides a method for separating boron, which comprises: Providing the aforementioned boron collector; And, the boron-containing solution is mixed with the boron collector and subjected to adsorption separation, thereby achieving selective separation of boron.

[0010] Compared with the prior art, the beneficial effect of the present invention is that the present invention uses a cis-hydroxy compound combined with a surfactant to regulate and modify hydrotalcite as a boron collector. When the boron collector is used to separate boron, it is not affected by the pH value of the solution and has the advantages of simple operation, low cost, green environmental protection, easy scale-up, wide applicable range of boron concentration, and high boron separation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1a-1b is a schematic diagram of a boron collector separating boron in a typical embodiment of the present invention; Figure 2 is a Fourier transform infrared spectrum (FT-IR) diagram of the hydrotalcite before and after modification with the hydroxyl compound prepared in Example 1 of the present invention; Figure 3 is the XRD diagram of the hydrotalcite before and after modification prepared in Embodiment 1 of the present invention; Figure 4a-4b 1 is a scanning electron microscope (SEM) image of the hydrotalcite before and after modification prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0013] In view of the defects of the prior art, the inventors of this case have proposed the technical solution of the present invention after long-term research and extensive practice. The technical solution is mainly to use a cis-hydroxyl compound combined with a surfactant to regulate and modify hydrotalcite as a boron collector. The cis-hydroxyl group can have a strong complexation with the boron in the solution, and then the boron is separated by flotation coupling with a frother, so as to achieve the purpose of effectively separating boron from salt lake brine. The complexation diagram is shown in the figure Figure 1a-1b shown.

[0014] The technical solution of the present invention will be 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.

[0015] Specifically, as one aspect of the technical solution of the present invention, a method for preparing a boron collector includes: mixing an alkaline solution with a mixed solution containing at least a magnesium salt, an aluminum salt, a cis-hydroxy compound, and a surfactant and performing a crystallization treatment to obtain a boron collector; The cis-hydroxy compound includes any one or more combinations of glyceraldehyde, sucrose, maltose, lactose, ribose, ketose, N-acetylglucosamine, and gum arabic, but is not limited thereto.

[0016] In some preferred embodiments, the preparation method specifically comprises: (1) Prepare alkaline solution and maintain the temperature at 20-60°C; (2) mixing the magnesium salt, the aluminum salt, the cis-hydroxy compound and the surfactant and stirring them uniformly to form a mixed solution; (3) Under stirring conditions, the alkaline solution is added dropwise to the mixed solution, followed by crystallization at 50-90° C. for 2-6 hours, followed by centrifugation, washing, and drying to obtain a boron collector.

[0017] Further, the alkaline solution includes sodium hydroxide solution, but is not limited thereto.

[0018] Furthermore, the magnesium salt includes any one or more combinations of magnesium chloride, magnesium nitrate, and magnesium sulfate, but is not limited thereto.

[0019] Furthermore, the aluminum salt includes any one or more combinations of aluminum chloride, aluminum nitrate, and aluminum sulfate, but is not limited thereto.

[0020] Furthermore, the surfactant includes any one or more combinations of stearic acid, oleic acid, lauric acid, sodium secondary alkyl sulfonate, sodium fatty acid methyl ester ethoxylate sulfonate, sodium fatty acid methyl ester sulfonate, dioctyl sodium succinate sulfonate, hexadecyl ammonium bromide, and fatty acid glyceride, and is not limited thereto.

[0021] Furthermore, the concentration of the alkaline solution is 1-4 mol / L.

[0022] Furthermore, the molar ratio of the alkaline solution to the metal in the mixed solution is 1:1-6:1. Furthermore, the molar ratio of the magnesium salt to the aluminum salt is 1-5:1.

[0023] Furthermore, the content of the cis-hydroxy compound in the mixed solution is 5-40wt%.

[0024] Furthermore, the content of the surfactant in the mixed solution is 1-20wt%.

[0025] Furthermore, the drying temperature is 25-100°C.

[0026] Furthermore, the drying temperature is 40-100°C.

[0027] Furthermore, the drying process takes 6 to 48 hours.

[0028] In some more specific embodiments, the method for preparing the boron collector comprises: (1) Prepare a NaOH solution of a certain concentration and maintain the temperature at 20-60°C in a water bath.

[0029] (2) Prepare a mixed solution with a certain concentration and molar ratio of magnesium to aluminum, add a certain amount of cis-hydroxy compound and surfactant, and stir evenly.

[0030] (3) While stirring continuously, a certain volume of the mixed solution of step (2) is added dropwise to the solution of step (1). After the addition is completed, crystallization is carried out in a water bath at a temperature of 50-90° C. for 2-6 h.

[0031] (4) After centrifugation, washing and drying, the Mg-Al-LDHs (i.e., boron collector) modified with cis-hydroxyl groups is obtained. The drying temperature is 40-100°C and the drying time is 6-48 h.

[0032] Preferably, the cis-hydroxy compound in step (2) is mainly one of glyceraldehyde, sucrose, maltose, lactose, ribose, ketose, N-acetylglucosamine and gum arabic.

[0033] Preferably, the surfactant in step (2) is mainly one of stearic acid, oleic acid, lauric acid, sodium secondary alkyl sulfonate, sodium fatty acid methyl ester ethoxylate sulfonate, sodium fatty acid methyl ester sulfonate, dioctyl sodium succinate sulfonate, hexadecyl ammonium bromide, fatty acid glyceride, etc.

[0034] Preferably, the raw material of the magnesium-aluminum mixed solution in step (2) is mainly one of chloride, nitrate and sulfate.

[0035] Another aspect of the embodiments of the present invention further provides a boron collector prepared by the aforementioned preparation method.

[0036] Another aspect of the embodiments of the present invention further provides use of the aforementioned boron collector in the selective separation of boron.

[0037] Another aspect of an embodiment of the present invention further provides a method for separating boron, comprising: Providing the aforementioned boron collector; And, the boron-containing solution is mixed with the boron collector and subjected to adsorption separation, thereby achieving selective separation of boron.

[0038] In some preferred embodiments, the pH value of the boron-containing solution is 2-11.

[0039] In some preferred embodiments, the concentration of boron in the boron-containing solution is 20-1000 mg / L.

[0040] In some preferred embodiments, the boron-containing solution further comprises Na + , K + Mg 2+ , Ca 2+ , Li + Any one or more combinations of the foregoing, and not limited to these.

[0041] In some preferred embodiments, the boron-containing solution further comprises Cl - 、SO4 2- 、NO3 - Any one or more combinations of; In some preferred embodiments, the boron-containing solution is derived from any one or more combinations of brine, seawater, oil and gas field water, wastewater, and sewage, but is not limited thereto.

[0042] In some preferred embodiments, the method specifically comprises: adding the boron collector to the boron-containing solution and stirring for 0.1 to 6 hours for adsorption separation, and then adding a frother for flotation, thereby achieving selective separation of boron.

[0043] Furthermore, the foaming agent includes any one or more combinations of alkyl sulfonic acid compounds, betaine compounds, stearic acid compounds, eucalyptus oil, camphor oil, and cresol acid, but is not limited thereto.

[0044] In some preferred embodiments, the molar ratio of the boron collector to the boron in the boron-containing solution is 1:1 to 8:1.

[0045] Furthermore, the molar ratio of the boron collector to the boron in the boron-containing solution is 1:1 to 6:1.

[0046] In some more specific embodiments, the method for separating boron comprises: Step S1: preparing a magnesium-aluminum mixed solution containing a cis-hydroxy compound and a surfactant of a certain concentration, wherein the magnesium-aluminum molar ratio is 1-5, the cis-hydroxy compound content is 5%-40%, and the surfactant content is 1%-20%.

[0047] Step S2: Under continuous stirring, add a certain amount of sodium hydroxide solution of a certain concentration to the solution in step S1, and keep the temperature at 20-60° C. in a water bath. After the dropwise addition is completed, crystallize at a certain temperature for a certain time.

[0048] Step S3: centrifuge, wash and dry the mixed solution obtained in step S2 to obtain the target collector. The washing solution is deionized water, and the drying temperature is 25-100°C; Step S4: adding the collector obtained in step S3 to a certain amount of boron-containing solution, wherein the ratio of the added collector to the amount of boron in the solution is in the range of 1:1 to 8:1; Step S5: Stir the solution in step S4 for 2 to 24 hours, then add a frother for flotation, and then perform solid-liquid separation.

[0049] Preferably, the cis-hydroxy organic compound in step S1 is mainly one of glyceraldehyde, sucrose, maltose, lactose, ribose, ketose, N-acetylglucosamine and gum arabic.

[0050] Preferably, the surfactant described in step S1 is mainly one of stearic acid, oleic acid, lauric acid, sodium secondary alkyl sulfonate, sodium fatty acid methyl ester ethoxylate sulfonate, sodium fatty acid methyl ester sulfonate, dioctyl sodium succinate sulfonate, hexadecyl ammonium bromide, fatty acid glyceride, etc.

[0051] Preferably, the foaming agent includes one of alkyl sulfonic acids, betaines, stearic acids, eucalyptus oil, camphor oil, and cresol acid.

[0052] Preferably, the pH value of the boron-containing solution is 2-10.

[0053] Preferably, the boron concentration of the boron-containing solution is 20-1000 mg / L.

[0054] Preferably, the boron-containing solution also includes Na + and / or K + and / or Ca 2+ and / or Mg 2+ .

[0055] Preferably, the boron-containing solution also includes Cl - and / or NO3 - and / or SO4 2- and / or CO3 - .

[0056] Preferably, the boron-containing solution also includes brine, seawater, oil and gas field water, wastewater, sewage and other boron-containing solutions.

[0057] The present invention uses hydrotalcite as a precursor and adopts a coprecipitation method to modify the hydrotalcite with a compound containing a cis-hydroxyl group that reacts with boron to improve the selectivity of boron. The method has the advantages of simple operation, low cost, no influence of solution pH, wide applicable range of boron concentration, high boron separation efficiency, etc.

[0058] The technical solution of the present invention is further described in detail below in conjunction with several preferred embodiments and drawings. This embodiment is implemented on the premise of the technical solution of the invention, and a detailed implementation method and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0059] Unless otherwise specified, the experimental materials used in the following examples can be purchased from conventional biochemical reagent companies.

[0060] Example 1 Measure 800 mL of 2 mol / L sodium hydroxide solution into a container and keep the temperature at 40°C in a water bath. Prepare a mixed solution of magnesium nitrate and aluminum nitrate, 5% glyceraldehyde and 1% sodium fatty acid methyl ester sulfonate according to the concentration of the magnesium-aluminum mixed solution of 2 mol / L and the molar ratio of magnesium to aluminum of 4:1. Add 800 mL of the mixed solution dropwise into the sodium hydroxide solution under constant stirring. After the addition is completed, crystallize at a water bath temperature of 90°C for 8 h. Finally, after centrifugation, washing, and drying (drying temperature is 40°C) for 48 h, the hydroxyl-modified hydrotalcite is obtained. The Fourier transform infrared spectrum (FT-IR) of the hydrotalcite before and after modification in this embodiment is shown in the figure below. Figure 2 As shown, the XRD pattern is Figure 3 As shown in the scanning electron microscope (SEM) image Figure 4a-4b shown.

[0061] Example 2 500 mL of 1 mol / L sodium hydroxide solution was measured and placed in a container, and the temperature was maintained at 40°C in a water bath. A mixed solution of magnesium nitrate and aluminum nitrate, 6% lactose and 5% sodium secondary alkyl sulfonate were prepared according to the concentration of the magnesium-aluminum mixed solution of 2 mol / L and the molar ratio of magnesium to aluminum of 1:1. Under constant stirring, 600 mL of the mixed solution was added dropwise to the sodium hydroxide solution. After the addition was completed, crystallization was performed at a water bath temperature of 70°C for 6 h. Finally, the hydroxyl-modified hydrotalcite was obtained after centrifugation, washing, and drying (drying temperature was 120°C) for 12 h.

[0062] Example 3 1000 mL of 3 mol / L sodium hydroxide solution was measured in a container and maintained at 60°C in a water bath. A mixed solution of magnesium nitrate and aluminum nitrate, 1% gum arabic and 2% fatty acid glyceride were prepared according to the concentration of the magnesium-aluminum mixed solution of 5 mol / L and the molar ratio of magnesium to aluminum of 3:1. 500 mL of the mixed solution was added dropwise to the sodium hydroxide solution under constant stirring. After the addition was completed, crystallization was performed at a water bath temperature of 40°C for 10 h. Finally, the hydroxyl-modified hydrotalcite was obtained after centrifugation, washing, and drying (drying temperature was 60°C) for 48 h.

[0063] Example 4 700 mL of 1 mol / L sodium hydroxide solution was measured in a container and kept at 50°C in a water bath. A mixed solution of magnesium nitrate and aluminum nitrate, 2% N-acetylglucosamine and 5% hexadecyl ammonium bromide were prepared according to the concentration of the magnesium-aluminum mixed solution of 2 mol / L and the molar ratio of magnesium to aluminum of 4:1. Under constant stirring, 300 mL of the mixed solution was added dropwise to the sodium hydroxide solution. After the addition was completed, crystallization was performed at a water bath temperature of 90°C for 6 h. Finally, the hydroxyl-modified hydrotalcite was obtained after centrifugation, washing, and drying (drying temperature was 80°C) for 48 h.

[0064] Example 5 600 mL of 4 mol / L sodium hydroxide solution was measured and placed in a container, and the temperature was maintained at 60°C in a water bath. A mixed solution of magnesium nitrate and aluminum nitrate, 5% maltose and 1% oleic acid were prepared according to the concentration of the magnesium-aluminum mixed solution of 4 mol / L and the molar ratio of magnesium to aluminum of 2:1. Under constant stirring, 300 mL of the mixed solution was added dropwise to the sodium hydroxide solution. After the addition was completed, crystallization was performed at a water bath temperature of 90°C for 6 hours. Finally, the hydroxyl-modified hydrotalcite was obtained after centrifugation, washing, and drying (drying temperature was 200°C) for 6 hours.

[0065] Example 6 Take 500 mL of the boron-containing solution, add 1 g of the hydroxyl-modified hydrotalcite in Example 1, shake it in a constant temperature oscillator at 25°C and pH=5 for 4 h, and then add 0.5 g of sodium dodecylbenzene sulfonate for flotation. Take a certain amount of flotation bottom liquid, use sodium hydroxide titration to analyze the boron concentration, and calculate the flotation adsorption capacity to be 6.5 mmol / g.

[0066] Example 7 Take 1000 mL of the boron-containing solution, add 2 g of the hydroxyl-modified hydrotalcite in Example 1, shake it in a constant temperature oscillator at 35°C and pH=6 for 10 h, and then add 1 g of hexadecyltrimethylammonium bromide for flotation. Take a certain amount of the flotation bottom liquid, use sodium hydroxide titration to analyze the boron concentration therein, and calculate the adsorption capacity to be 6.8 mmol / g.

[0067] Example 8 Take 500 mL of the boron-containing solution, add 1 g of the hydroxyl-modified hydrotalcite in Example 2, shake it in a constant temperature oscillator at 45°C and pH = 7 for 6 hours, and then add 2 g of sodium dodecylbenzene sulfonate for flotation. Take a certain amount of flotation bottom liquid, use sodium hydroxide titration to analyze the boron concentration, and calculate the flotation adsorption capacity to be 7.1 mmol / g.

[0068] Example 9 Take 100 mL of the boron-containing solution, add 0.1 g of the hydroxyl-modified hydrotalcite in Example 1, shake it in a constant temperature oscillator at 25°C and pH = 9 for 2 h, and then add 0.5 g of sodium dodecylbenzene sulfonate for flotation. Take a certain amount of flotation bottom liquid, use sodium hydroxide titration to analyze the boron concentration, and calculate the flotation adsorption capacity to be 6.3 mmol / g.

[0069] Embodiment 11 Take 100 mL of the boron-containing solution, add 0.1 g of the hydroxyl-modified hydrotalcite in Example 1, shake it in a constant temperature oscillator at 25°C and pH = 11 for 2 h, and then add 0.5 g of sodium dodecylbenzene sulfonate for flotation. Take a certain amount of flotation bottom liquid, use sodium hydroxide titration to analyze the boron concentration, and calculate the flotation adsorption capacity to be 6.1 mmol / g.

[0070] Example 12 Take 100 mL of the boron-containing solution, add 0.1 g of the hydroxyl-modified hydrotalcite in Example 1, shake it in a constant temperature oscillator at 25°C and pH = 3 for 2 h, and then add 0.5 g of sodium dodecylbenzene sulfonate for flotation. Take a certain amount of flotation bottom liquid, use sodium hydroxide titration to analyze the boron concentration therein, and calculate the flotation adsorption capacity to be 6.0 mmol / g.

[0071] Comparative Example 1 The method is the same as Example 1, except that glyceraldehyde (cis-hydroxy compound) is missing to prepare the boron collector; then boron separation is carried out in the same manner as in Example 6, and the flotation adsorption capacity is 3.2 mmol / g.

[0072] Comparative Example 2 The method is the same as Example 1, except that sodium fatty acid methyl ester sulfonate (surfactant) is missing to prepare the boron collector; then boron separation is carried out in the same manner as in Example 6, and the flotation adsorption capacity is 4.6 mmol / g.

[0073] In addition, the inventors of this case also referred to the aforementioned embodiments and conducted experiments with other raw materials, process operations, and process conditions described in this specification, and obtained relatively ideal results.

[0074] It should be understood that the technical solution of the present invention is not limited to the above-mentioned specific implementation cases. Any technical deformation made according to the technical solution of the present invention without departing from the scope of protection of the purpose of the present invention and the claims shall fall within the protection scope of the present invention.

Claims

1. A method for preparing a boron collector, characterized in that: include: The alkaline solution is mixed with a mixed solution containing at least a magnesium salt, an aluminum salt, a cis-hydroxy compound, and a surfactant, and then subjected to a crystallization treatment to obtain a boron collector; The cis-hydroxy compound includes any one or more combinations of glyceraldehyde, sucrose, maltose, lactose, ribose, ketose, N-acetylglucosamine and gum arabic.

2. The preparation method according to claim 1, characterized in that: Specifically include: (1) Prepare alkaline solution and maintain the temperature at 20-60°C; (2) mixing the magnesium salt, the aluminum salt, the cis-hydroxy compound and the surfactant and stirring them uniformly to form a mixed solution; (3) Under stirring conditions, the alkaline solution is added dropwise to the mixed solution, followed by crystallization at 50-90° C. for 2-6 h, followed by centrifugation, washing, and drying to obtain a boron collector.

3. The preparation method according to claim 2, characterized in that: The alkaline solution includes a sodium hydroxide solution; And / or, the magnesium salt includes any one or more combinations of magnesium chloride, magnesium nitrate and magnesium sulfate; And / or, the aluminum salt includes any one or more combinations of aluminum chloride, aluminum nitrate, and aluminum sulfate; And / or, the surfactant includes any one or more combinations of stearic acid, oleic acid, lauric acid, sodium secondary alkyl sulfonate, sodium fatty acid methyl ester ethoxylate sulfonate, sodium fatty acid methyl ester sulfonate, dioctyl sodium succinate sulfonate, hexadecyl ammonium bromide, and fatty acid glyceride.

4. The preparation method according to claim 2, characterized in that: The concentration of the alkaline solution is 1-4 mol / L; and / or, the molar ratio of the alkaline solution to the metal in the mixed solution is 1:1-6:1; And / or, the molar ratio of the magnesium salt to the aluminum salt is 1 to 5:1; and / or, the content of the cis-hydroxy compound in the mixed solution is 5-40wt%; and / or, the content of the surfactant in the mixed solution is 1-20wt%; And / or, the drying treatment temperature is 25-100° C., preferably 40-100° C.; and / or, the drying treatment time is 6-48 hours.

5. A boron collector prepared by the preparation method according to any one of claims 1 to 4.

6. Use of the boron collector according to claim 5 in the selective separation of boron.

7. A method for separating boron, characterized in that: include: Providing the boron collector according to claim 5; And, the boron-containing solution is mixed with the boron collector and subjected to adsorption separation, thereby achieving selective separation of boron.

8. The method according to claim 7, characterized in that: The pH value of the boron-containing solution is 2 to 11; And / or, the concentration of boron in the boron-containing solution is 20-1000 mg / L; And / or, the boron-containing solution also includes Na + , K + Mg 2+ , Ca 2+ , Li + Any one or more combinations of; And / or, the boron-containing solution further comprises Cl - 、SO4 2- 、NO3 - Any one or more combinations of; And / or, the boron-containing solution is derived from any one or more combinations of brine, seawater, oil and gas field water, wastewater, and sewage.

9. The method according to claim 7, characterized in that: Specifically include: The boron collector is added to the boron-containing solution and stirred for 0.1 to 6 hours for adsorption separation, and then a frother is added for flotation, thereby achieving selective separation of boron; preferably, the frother includes any one or more combinations of alkyl sulfonic acid compounds, betaine compounds, stearic acid compounds, eucalyptus oil, camphor oil, and cresol acid.

10. The method according to claim 7, characterized in that: The molar ratio of the boron collector to the boron in the boron-containing solution is 1:1 to 8:1, preferably 1:1 to 6:1.

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