Electrolyte solution for electrolytically preparing gamma-AlOOH as well as preparation method and application of electrolyte solution

Abstract

The invention belongs to the field of inorganic chemistry, and particularly relates to an electrolyte solution for preparing gamma-AlOOH through electrolysis and a preparation method and application of the electrolyte solution. (2) weighing an inorganic compound crystal; and (3) adding the weighed inorganic compound crystal into the inorganic salt aqueous solution prepared in the step (1), and stirring to obtain a uniformly mixed solution. The electrolyte solution of gamma-AlOOH prepared through electrolysis has the advantages of being simple in method, efficient, environmentally friendly and the like, and can be widely applied to the fields of ceramics, coatings, catalysts and the like.

Description

Technical Field

[0001] The present invention belongs to the field of inorganic chemistry, and specifically relates to an electrolyte solution for electrolytically preparing γ-AlOOH, a preparation method thereof and an application thereof. In particular, it relates to the technical field of processes for preparing γ-AlOOH. The electrolyte solution for electrolytically preparing γ-AlOOH of the present invention has the advantages of being simple, efficient and environmentally friendly, and can be widely used in the fields of ceramics, coatings, catalysts and the like. Background Art

[0002] In the prior art, γ-AlOOH is an important inorganic substance with good thermal stability and chemical stability, and is widely used in ceramics, coatings, catalysts and other fields. At present, the methods for preparing γ-AlOOH mainly include chemical precipitation method, hydrothermal method, etc., but these methods have problems such as high production cost, complex operation, and environmental pollution. Therefore, it is of great significance to find a simple, efficient and environmentally friendly method for preparing γ-AlOOH.

[0003] In the current technical field, traditional γ-AlOOH preparation methods mainly include chemical methods and electrochemical methods. Specifically, the chemical method covers aluminum hydroxide precipitation method and sol-gel method. The aluminum hydroxide precipitation method generates aluminum hydroxide precipitate by reacting with sodium hydroxide in an aluminum salt solution, and then prepares γ-AlOOH through subsequent washing, filtering, drying and other steps. The sol-gel method is to dissolve precursors such as metal organic compounds or aluminum nitrate to form a sol, and then form γ-AlOOH through gel treatment. In addition, the electrochemical method involves electrodeposition method and electrochemical synthesis method. The electrodeposition method deposits γ-AlOOH on the cathode by applying an electric current in the electrolyte. The electrochemical synthesis method prepares γ-AlOOH by electrolyzing a metal solution.

[0004] However, the traditional method has many drawbacks, such as low yield, high energy consumption, unstable product quality and environmental pollution. These challenges limit the further development of the traditional γ-AlOOH preparation method in terms of efficiency, quality and environmental protection.

[0005] In general, the challenges of traditional methods are in sharp contrast to the advantages of sulfate solutions as electrolytes. The present invention is an innovative solution to these challenges, which is expected to promote the development of γ-AlOOH preparation technology and improve production efficiency and product quality. This provides new possibilities for the production of high-quality γ-AlOOH and is conducive to market development. In general, traditional methods face challenges, while the new method adopted by the present invention brings opportunities, which is expected to solve the problems of traditional methods, improve production efficiency and product quality, and thus achieve breakthrough progress in the field of γ-AlOOH preparation. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an electrolyte and a preparation method thereof that has environmental protection performance and can improve the current efficiency and product quality of electrolytic preparation of γ-AlOOH. The present invention has obvious advantages in using sulfate solution as electrolyte. First, sulfate solution can improve electrolysis efficiency and help increase the output of γ-AlOOH. Secondly, the use of sulfate solution can extend the service life of equipment and help maintain production stability. In addition, the use of sulfate solution can also improve the purity of the product, reduce impurities, and improve product quality.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] The novel electrolyte solution for preparing γ-AlOOH by electrolysis provided by the present invention is an aqueous solution formed by a mixed system of inorganic compound / water / inorganic salt. The inorganic compound is uniformly mixed with the inorganic salt aqueous solution in certain different proportions, and stirred at a uniform speed with a magnetic stirrer at room temperature to form a uniform solution, thereby obtaining an electrolyte with environmental protection performance and capable of improving the current efficiency and product quality of preparing γ-AlOOH by electrolysis.

[0009] The present invention provides a method for preparing a novel electrolyte solution for electrolytically preparing γ-AlOOH, and the specific steps are as follows:

[0010] (1) preparing inorganic salt aqueous solutions of different concentrations;

[0011] (2) Weigh a certain mass (4-30 g) of inorganic compound crystals;

[0012] (3) adding the weighed inorganic compound crystals to the inorganic salt aqueous solution prepared in (1), and stirring to obtain a uniformly mixed solution;

[0013] In order to ensure the constant proportion of each component in the product, the mixed solution should be prepared as soon as possible for immediate use to achieve the best effect.

[0014] The temperature range of the present invention is -12 to 80°C, preferably 0 to 70°C, and most preferably 40 to 70°C.

[0015] The pressure condition of the preparation method of the present invention is under normal atmospheric pressure.

[0016] In the application of the present invention, the electrolysis time depends on the consumption of the anode aluminum sheet. The better the quality of the aluminum sheet, the larger the anode aluminum sheet, and the longer the electrolysis time.

[0017] The stirring speed in step (3) of the preparation method of the present invention is in the range of 50 to 2000 rpm, preferably in the range of 100 to 1200 rpm, and most preferably in the range of 400 to 1000 rpm. The stirring speed needs to be controlled so that the reaction rate can be accelerated while ensuring that the reactants are fully contacted and react relatively fully.

[0018] In the present invention, the molar concentration of the inorganic salt aqueous solution is 0.05-0.5 mol / L, and the pH value adjusted by the inorganic compound crystal is in the range of 7-10 (according to the dissolution equilibrium constant of aluminum (Ksp=2.7×10 -33 ) The autoionization constant of water K w =1.0×10 -14 And the dissolution equilibrium reaction of aluminum is calculated to obtain the existence form of aluminum ions at different pH values) Figure 1 shown.

[0019] The determination of the pH value in the present invention is known through preliminary calculations and further experimental verification that its approximate range is 7 to 10, the preferred range is 8 to 10, and the most preferred range is 8 to 9; in such a range, both the purity of the desired product and the relatively regular shape of the product can be guaranteed. Through experiments and characterization of the experimental products, it can be known that when the pH range is 7 to 8, the product yield is low and the generated product is characterized by XRD and other characterization methods and TEM (transmission electron microscope) observation, and it is seen that the obtained product not only has a small amount of impurities, but also other products containing aluminum elements are generated, and the generated target product is small in shape and uneven in appearance. When the pH range is 9 to 10, the generated product is characterized by XRD and other characterization methods and TEM (transmission electron microscope) observation, and it is seen that the obtained product not only has a small amount of impurities such as pseudo-boehmite (which has a different crystal form from boehmite), but also the generated target product is seriously agglomerated. Figure 2 shown.

[0020] Figure 2 Among them, 1 represents the pH range of 7-8, 2 represents the pH range of 9-10, and 3 represents the pH range of 8-9.

[0021] In the present invention, the inorganic salt is one of the inorganic compounds of a certain mass, such as Al2(SO4)3 / NH4NO3 / (NH4)2SO4 / Na2SO4 / (NH4)3PO4 / NH4Cl, or a mixture of several of them.

[0022] In the process of mixing two inorganic salt solutions in the present invention, in order to ensure the stability and applicability of the properties of the mixture, it is recommended to strictly control the mixing ratio within the range of 1:4 to 1:1. 3，Na2SO4 and (NH4)2SO 4， The mass ratio of Al2(SO4)3 and (NH4)3PO4, Na2SO4 and NH4NO3 is 1:4-1:1. In practice, this ratio range is designed to achieve the best chemical reaction effect and ensure that the mixture has the desired properties and characteristics; when it comes to complex mixing of three or more kinds of solutions, special attention should be paid to maintaining the ammonium ion (NH4 + ) in a solution. The presence of ammonium ions in a solution is essential for regulating the acidity and alkalinity of the solution, affecting the reaction of metal ions, and regulating the interaction between other ions. Therefore, in the process of mixing multiple solutions, it is important to ensure the presence of ammonium ions and carefully select the mixing ratio to ensure the stability and effectiveness of the final mixture. By following the above suggestions, the mixing process of multiple solutions can be better controlled, the potential of the mixture can be maximized, and the desired chemical reactions and properties can be achieved. These measures help to improve the success rate of experiments, ensure the accuracy and repeatability of experimental results, and lay a solid foundation for the effective use of mixtures in various application fields.

[0023] In the present invention, the inorganic compound crystals are a mixture of a certain mass of Al(OH)3 / NaOH / KOH / Ca(OH)2 / NH3·H2O or one or several of other alkaline substances. During the mixing process, it should be ensured that the pH value of the mixed electrolyte solution falls within the range of 7 to 10. In practice, the selection of this pH range is intended to ensure that the electrolyte solution meets the requirements of a neutral to alkaline environment, thereby adapting to the processing and experimental conditions in different applications. Keeping the electrolyte solution within this pH range helps to maintain the stability of the solution and the normal progress of the chemical reaction, thereby ensuring the properties and effects of the mixture. In order to achieve the requirements, the mixing components and proportions should be carefully selected to ensure that the pH value of the mixed electrolyte solution is within an acceptable range. By controlling the mixing process and accurately adjusting the chemical properties of the solution, the pH value of the electrolyte solution can be effectively controlled within the desired range to meet the requirements of specific applications and ensure the quality and stability of the mixture. Under the guidance of these measures, the mixing process can be better controlled and the potential of the resulting mixture can be maximized, providing a reliable basis and guarantee for experiments and applications. Such implementation measures help ensure the quality and performance of the electrolyte solution to achieve optimal results in electrochemical applications.

[0024] The novel electrolyte solution prepared by the present invention for preparing γ-AlOOH by electrolysis has relatively stable properties and can be used in a temperature range of -12 to 80° C., thereby ensuring the relative stability of the pH value of the original electrolyte solution.

[0025] The novel electrolyte solution for electrolytic preparation of γ-AlOOH prepared by the present invention can still well control the pH value under relatively high temperature conditions, meet the requirements of corresponding chemical reactions, and greatly improve the application upper limit of the preparation method.

[0026] The present invention also provides an electrolyte solution prepared by the method for preparing the electrolyte solution for electrolytic preparation of γ-AlOOH.

[0027] The present invention also provides an application of the electrolyte solution for preparing γ-AlOOH by electrolysis in preparing γ-AlOOH by electrolysis. In the application, the temperature is controlled in the range of -12 to 80°C.

[0028] The present invention has the following advantages:

[0029] (1) The sulfate solution used in the present invention has high conductivity and good ion transfer capacity, which is beneficial to improving the electrolysis efficiency; sulfate can significantly improve the conductivity of the electrolyte solution, thereby helping to improve the efficiency and speed of the electrolysis reaction. High conductivity helps the current to pass through the electrolyte solution more effectively, promotes the reaction, and improves the yield of the product. This is of great significance for increasing the reaction rate and reducing energy loss.

[0030] (2) The sulfate solution does not produce by-products or affect the crystal morphology of γ-AlOOH in the formation process, which is conducive to obtaining a γ-AlOOH product with higher purity; sulfate provides sulfate ions and other ions, which are important participants in the electrolysis reaction. Their presence helps to stabilize the reaction process and promote the transfer of ions, thereby increasing the yield.

[0031] (3) Sulfate has good solubility and can easily form a uniform electrolyte in the solution. This is conducive to maintaining the uniformity and stability of the reaction and helps ensure that the reaction proceeds evenly throughout the solution, thereby improving the purity and consistency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a diagram of the existence forms of hydrated alumina phases at different pH values ​​(boe: boehmite; nor: norwegian gibbsite; bay: bayerite; gib: gibbsite; mgib: microcrystalline gibbsite; agel: amorphous gel).

[0033] Figure 2 XRD characterization diagrams of the experimental products under different pH ranges (1 is the pH range of 7-8, 2 is the pH range of 9-10, and 3 is the pH range of 8-9)

[0034] Figure 3 This is a SEM image of γ-AlOOH prepared by electrolysis according to the present invention.

[0035] Figure 4 SEM image of γ-AlOOH prepared by electrolysis in NH4Cl electrolyte solution. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] The environmental performance mentioned in the following embodiments refers to the fact that no harmful gases or harmful byproducts are produced during the reaction process and the products. Taking ammonium chloride as an example, the test and detection are carried out. During the electrolysis of the ammonium chloride solution, chloride ions will also participate in the reaction to produce chlorine. Chlorine is a toxic gas, and contact with high concentrations of chlorine can cause irritation and damage to the respiratory tract and skin; in some cases, the electrolysis of ammonium chloride solution may produce hydrogen chloride gas, which is a toxic gas that has a strong irritating effect on the respiratory tract and skin.

[0038] The current efficiency involved in the following embodiments is the efficiency of converting current into products in electrochemical reactions. Current efficiency is usually used to evaluate the purity and yield of products during electrolysis. CE = (number of moles of actual product / number of moles of theoretical product) × 100%; wherein the number of moles of actual product is the number of moles of product determined by experimental results in the electrolysis experiment, and the number of moles of theoretical product is the theoretical number of moles calculated based on the equilibrium equation of the electrolysis reaction. By calculating the current efficiency, it is possible to evaluate whether the products produced during the electrolysis process meet expectations, and to optimize and control the electrolysis process.

[0039] The present invention discloses a novel electrolyte having environmental protection performance and capable of improving the current efficiency and product quality of electrolytic preparation of γ-AlOOH and a preparation method thereof.

[0040] Example 1

[0041] 10.56g Al2(SO4)3 and NH4NO3 were mixed (mixed in a mass ratio of 1:2) and then 800ml of deionized water was added to prepare a solution, and dissolved therein, then an equal portion of KOH solution was added to adjust its pH to 9, the stirring speed was 1000rpm, and after uniform mixing, it was allowed to stand for 1 minute to remove bubbles, and an electrolyte solution with environmental protection performance and capable of improving the current efficiency and product quality of electrolytic preparation of γ-AlOOH was obtained. It can work normally at -12-80℃ (uniform experiments under different conditions) at a current density of 4.32A / dm 2When the operating temperature is 55°C, the current efficiency is 97.8%.

[0042] Example 2

[0043] 21.12g Na2SO4 and (NH4)2SO4 were mixed (mixed in a mass ratio of 1:3), and then 800ml of deionized water was added to prepare a solution, and dissolved in it, and then an equal portion of NaOH solution was added to adjust its pH to 8, the stirring speed was 1000rpm, and after uniform mixing, it was allowed to stand for 1 minute to remove bubbles, and an electrolyte solution with environmental protection performance and capable of improving the current efficiency and product quality of electrolytic preparation of γ-AlOOH was obtained. It can work normally at -12 to 80°C and at a current density of 4.32A / dm 2 When the operating temperature is 55°C, the current efficiency is 96.2%.

[0044] Example 3

[0045] 21.12g Al2(SO4)3 and (NH4)3PO4 were mixed (mixed in a mass ratio of 1:1), and then 800ml of deionized water was added to prepare a solution and dissolved therein, and then an equal portion of NaOH solution was added to adjust the pH to 10, the stirring speed was 1000rpm, and after uniform mixing, the solution was allowed to stand for 1 minute to remove bubbles, thereby obtaining an electrolyte solution with environmental protection performance and capable of improving the current efficiency and product quality of electrolytic preparation of γ-AlOOH, which can work normally at -12 to 80°C and at a current density of 3.6A / dm 2 When the operating temperature is 65°C, the current efficiency is 94.9%.

[0046] Example 4

[0047] 10.56 g Na2SO4 and 800 ml deionized water were used to prepare a Na2SO4 solution, which was dissolved. Then, an equal amount of Ca(OH)2 solution was added to adjust its pH to 7. The stirring speed was 1000 rpm. After uniform mixing, the mixture was allowed to stand for 1 minute to remove bubbles. An electrolyte solution with environmental protection performance and the ability to improve the current efficiency and product quality of electrolytic preparation of γ-AlOOH was obtained. The electrolyte solution can work normally at -12 to 80 °C and at a current density of 3.6 A / dm 2 When the operating temperature is 70°C, the current efficiency is 88.6%.

[0048] Example 5

[0049] 15.84 g of Na2SO4 and NH4NO3 were mixed (mixed in a ratio of 1:2), and then 800 ml of deionized water was added to prepare a solution and dissolved therein, and then an equal portion of NH3·H2O solution was added to adjust the pH to 7, the stirring speed was 1000 rpm, and after uniform mixing, the solution was allowed to stand for 1 minute to remove bubbles, thereby obtaining an electrolyte solution with environmental protection performance and capable of improving the current efficiency and product quality of electrolytic preparation of γ-AlOOH, which can work normally at -12 to 80°C and at a current density of 3.6 A / dm 2 When the operating temperature is 75°C, the current efficiency is 82.3%.

[0050] Example 6

[0051] 15.84g (NH4)3PO4 and 800ml deionized water were used to prepare (NH4)3PO4 solution, and then an equal amount of KOH solution was added to adjust its pH to 8.2. The stirring speed was 1000rpm. After uniform mixing, the solution was allowed to stand for 1 minute to remove bubbles. An electrolyte solution with environmental protection performance and capable of improving the current efficiency and product quality of electrolytic preparation of γ-AlOOH was obtained. The electrolyte solution can work normally at -12 to 80°C and at a current density of 4.32A / dm 2 When the operating temperature is 20°C, the current efficiency is 78.3%.

[0052] Compared with the γ-AlOOH prepared by electrolysis in other electrolyte solutions such as NH4Cl and AlCl3, the γ-AlOOH prepared by electrolysis in the present invention has a more uniform and stable reaction, a higher purity (basically infinitely close to 100%), a uniform size and appearance, and a higher calculated current efficiency. Figure 3 As shown. The purity of the product (about 80%) of γ-AlOOH prepared by electrolysis of other electrolyte solutions such as NH4Cl and AlCl3 is

[0053] The novel electrolyte solution for preparing γ-AlOOH by electrolysis prepared by the present invention can still well regulate the pH value under relatively high temperature conditions (80° C.). During the effect experiment, the pH value of the electrolyte solution is measured every 10 minutes with an electronic pH meter, and it is found that the pH value varies very little. Taking the initial pH=9 as an example, the pH value is 9.2 after 2 hours of electrolysis, which meets the requirements of the corresponding chemical reaction and greatly improves the application upper limit of the preparation method.

[0054] The present invention uses a sulfate solution with high electrical conductivity and good ion transfer capacity. In an electrochemical reaction, the selectivity of cations can affect the progress of the electrode reaction. The present invention uses ammonium sulfate and ammonium chloride as examples for comparison. When sodium hydroxide is used in an ammonium sulfate electrolyte for pH adjustment, the generated sodium ions may promote the cathode reaction and improve the reaction efficiency and yield. In contrast, the chloride ions in the ammonium chloride electrolyte will compete with the metal ions to react, reducing the selectivity of the preparation of the target product.

[0055] The present invention uses a sulfate solution to improve the electrolysis efficiency. Sulfate can significantly improve the conductivity of the electrolyte solution, thereby improving the efficiency and speed of the electrolysis reaction. High conductivity helps the current to pass through the electrolyte solution more efficiently, promotes the reaction, and improves the yield of the product. This is of great significance for improving the reaction rate and reducing energy loss. The ammonium sulfate electrolyte solution provides suitable reaction conditions, which is conducive to improving the electrolysis efficiency, reducing energy consumption and increasing the purity of the product. Suitable electrolysis conditions can promote more efficient reactions, reduce energy waste, and improve yield and product quality. ; pH value is crucial to the electrochemical properties and reaction process of the electrolyte solution. The ammonium sulfate electrolyte solution is adjusted to an alkaline condition by adding sodium hydroxide, which is conducive to controlling the progress of the electrolysis reaction and the purity of the product. In contrast, if the pH needs to be adjusted in the ammonium chloride electrolyte, other alkaline substances may need to be added, which increases the complexity of the operation and may introduce additional ions to affect the reaction process. In the electrolytic preparation process, selectivity is an important factor in ensuring the purity and quality of the obtained product. The ammonium sulfate electrolyte solution selects the titanium plate as the cathode, which can selectively promote the formation of γ-AlOOH and reduce other metal impurities. In contrast, ammonium chloride may introduce chloride ions to interfere with the reaction, affecting the purity and selectivity of the obtained product.

[0056] Comparative Example: 10.56 g of ammonium sulfate ((NH4)2SO4) particles were accurately weighed and dissolved in 800 ml of deionized water to prepare an electrolyte solution. The solution was stirred at a speed of 1000 rpm to mix evenly, and then allowed to stand for 1 minute to remove bubbles. In the experiment, a titanium plate was used as a cathode and an aluminum plate was used as an anode to perform an electrolysis operation to obtain the corresponding product, which was then characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). To further explore the influence of the electrolyte, the other experimental variables were kept unchanged, and ammonium sulfate ((NH4)2SO4) was replaced with 10.56 g of ammonium chloride (NH4Cl), and the electrolysis experiment was performed according to the same steps. The final product was also analyzed by XRD and FTIR. The results showed that the electrolysis system using ammonium chloride (NH4Cl) as the electrolyte showed a lower current efficiency, and the presence of hypochlorous acid was detected in the reaction accompanied by a small amount of chlorine. The generation of this by-product significantly affected the overall current efficiency and resulted in reduced purity and selectivity of the final product.

[0057] The present invention uses sulfate solution to form γ-AlOOH without generating byproducts or affecting its crystal form. Compared with chloride, there are no other anions in the sulfate solution to participate in the reaction. Their combination with aluminum ions is a relatively stable and simple chemical reaction, so no additional byproducts are generated in the process of generating γ-AlOOH. Sulfate ions mainly play the role of providing reactive ions in the reaction, and play a smaller role in controlling the crystal form. Therefore, the use of sulfate solution can more easily control the crystal form of γ-AlOOH, which is conducive to obtaining a γ-AlOOH product with higher purity; sulfate provides sulfate ions and other ions, which are important participants in the electrolytic reaction. Their presence helps to stabilize the reaction process and promote the transfer of ions, thereby improving the yield.

[0058] The sulfate used in the present invention has good solubility and is easy to form a uniform electrolyte in the solution. This is conducive to maintaining the uniformity and stability of the reaction, helping to ensure that the reaction proceeds evenly throughout the solution, thereby improving the purity and consistency of the product. Sulfate generally has a high solubility, that is, more sulfate molecules can be dissolved in water to form a saturated solution. This property enables sulfate to provide more ions when preparing an electrolyte solution, thereby increasing conductivity and making it easier to form a uniform electrolyte; sulfate has good ionization in water and can quickly decompose into sulfate ions (SO4 2-) and metal ions, thus forming a more stable electrolyte in the solution. This high degree of ionization helps to improve the conductivity of the electrolyte solution, making the electrolysis process smoother; because sulfates have good solubility and ionization, they can be evenly distributed in the solution to form a uniform electrolyte system. In the electrolyte, the uniform distribution of ions helps to improve the stability and conductivity of the electrolyte, making the entire electrolysis process more efficient and reliable.

[0059] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents. Of course, those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention, and that any changes or variations to the above embodiments will fall within the scope of the claims of the present invention as long as they are within the spirit of the present invention.

Claims

1. A method for preparing an electrolyte solution for electrolytic preparation of γ-AlOOH, characterized in that: The steps include: (1) preparing an inorganic salt aqueous solution; (2) Weighing the inorganic compound crystals; (3) Add the weighed inorganic compound crystals to the inorganic salt aqueous solution prepared in (1), and obtain a uniformly mixed solution by stirring.

2. The method for preparing an electrolyte solution for electrolytic preparation of γ-AlOOH according to claim 1, characterized in that: The inorganic salt is a mixture of one or more of Al2(SO4)3, NH4NO3, (NH4)2SO4, Na2SO4, (NH4)3PO4 or NH4Cl.

3. The method for preparing an electrolyte solution for electrolytic preparation of γ-AlOOH according to claim 2, characterized in that: The inorganic salt is a mixture of two inorganic salts: Al2(SO4)3 and NH4NO3, Na2SO4 and (NH4)2SO4, Al2(SO4)3 and (NH4)3PO4, or Na2SO4 and NH4NO3, all in a mass ratio of 1:4-1:

1.

4. The method for preparing an electrolyte solution for electrolytic preparation of γ-AlOOH according to claim 1, characterized in that: The molar concentration of the inorganic salt aqueous solution is 0.05-0.5 mol / L.

5. The method for preparing an electrolyte solution for electrolytic preparation of γ-AlOOH according to claim 1, characterized in that: The inorganic compound crystals are one of Al(OH)3, NaOH, KOH, Ca(OH)2, NH3·H2O or other alkaline substances or a mixture of several of them.

6. The method for preparing an electrolyte solution for electrolytic preparation of γ-AlOOH according to claim 1, characterized in that: The pH value adjusted for the inorganic compound crystals in step (3) is in the range of 7 to 10.

7. The method for preparing an electrolyte solution for electrolytic preparation of γ-AlOOH according to claim 1, characterized in that: The stirring speed in step (3) ranges from 50 to 2000 rpm.

8. An electrolyte solution prepared by the method for preparing an electrolyte solution for electrolytic preparation of γ-AlOOH according to any one of claims 1 to 7.

9. Use of the electrolyte solution for electrolytic preparation of γ-AlOOH according to claim 8 in electrolytic preparation of γ-AlOOH.

10. Use of the electrolyte solution for electrolytic preparation of γ-AlOOH according to claim 9 in electrolytic preparation of γ-AlOOH, characterized in that: The control temperature range is -12~80℃.

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