Ruthenium hydroxide and preparation method thereof

Abstract

The invention belongs to the technical field of preparation of high-purity ruthenium hydroxide, and discloses ruthenium hydroxide and a preparation method thereof.The preparation method of ruthenium hydroxide comprises the following steps that 1, a first chlororuthenium acid solution with the acidity being 5-8 mol / L and the ruthenium content being 2-8 wt% is subjected to acid evaporation and concentration, and a second chlororuthenium acid solution with the acidity being 3 mol / L or below is obtained; and 2, adding alkali liquor into the second chlororuthenium acid solution for precipitation treatment to obtain ruthenium hydroxide. According to the method, the ruthenium content of the chlororuthenium acid is controlled, and the acid evaporation concentration treatment operation of the chlororuthenium acid solution in a specific acidity range is matched, so that the generation particle size of ruthenium hydroxide can be controlled, and the washing loss caused by difficult centrifugal precipitation of colloid formed by ruthenium hydroxide with too small particle size can be avoided; and the problem that the purity of ruthenium hydroxide is reduced due to the fact that impurities are difficult to wash out because the particle size of ruthenium hydroxide is too large to wrap impurity ions is solved.

Description

Technical Field

[0001] The invention relates to the technical field of high-purity ruthenium hydroxide preparation, and in particular to ruthenium hydroxide and a preparation method thereof. Background Art

[0002] Ruthenium compounds have excellent catalytic activity, stability, electrochemical activity and anti-toxicity, so they play an indispensable role in the fields of chemical industry, medicine, environmental protection and new energy. At present, the main ruthenium compounds in China are ruthenium trichloride, ruthenium dioxide, ruthenium nitrate and ruthenium acetate. Among them, ruthenium trichloride, ruthenium nitrate and ruthenium acetate can use ruthenium hydroxide as a precursor and react with hydrochloric acid, nitric acid and acetic acid respectively; ruthenium dioxide can be prepared by aerobic calcination of ruthenium hydroxide. Therefore, the preparation of high-purity ruthenium hydroxide as an intermediate for the synthesis of ruthenium products is crucial.

[0003] Ruthenium hydroxide is a black inorganic compound that is insoluble in neutral solutions and alkaline solutions, but soluble in acid solutions other than sulfuric acid. The preparation method of ruthenium hydroxide is mainly the hydrolysis method, in which alkaline solution is added dropwise to chlororuthenic acid solution to precipitate ruthenium ions, and then the chloride salt is repeatedly washed away by centrifugation or filtration to obtain high-purity ruthenium hydroxide.

[0004] For example, prior art 1: Chinese patent 201711041915.7 discloses a method for preparing hydrated ruthenium trichloride, which comprises mixing metallic ruthenium powder with sodium chloride and then melting them at high temperature, adding a trace amount of starch to maintain a weak reducing atmosphere in the early heating stage; then, introducing chlorine gas into the molten melt to convert most of the ruthenium powder into sodium chlororuthenate; the ruthenium tetroxide gas produced during the melting process is absorbed by a mixed solution of dilute hydrochloric acid and ethanol; the sodium chlororuthenate obtained by melting is combined with the dilute hydrochloric acid solution that absorbs ruthenium tetroxide, and then neutralized by adding sodium hydroxide to produce black ruthenium hydroxide or hydrated ruthenium dioxide.

[0005] Similarly, prior art 2: Chinese patent application 202211363972.8 discloses a method for preparing ruthenium hydroxide with a high solubility rate, which comprises the following steps: ⑴ At room temperature, use a hydrochloric acid solution with a concentration of 0.1 to 3 mol / L to completely dissolve the hydrated ruthenium trichloride into a brown-red clear solution, and then use an alkaline solution with a mass fraction of 1 to 30% to precisely adjust the pH value of the ruthenium trichloride solution to 7 to 8 at 0 to 10°C, and let it stand for 0.8 to 1.2 hours until all the ruthenium is precipitated, and centrifuge to obtain a precipitate; ⑵ The precipitate is repeatedly washed with deionized water until no chloride ions remain in the filtrate to obtain a wet solid; ⑶ After the wet solid is dried to constant weight at a constant temperature, a black ruthenium hydroxide solid with a solubility rate ≥96% is obtained.

[0006] Prior art 1 and prior art 2 use the hydrolysis method to prepare ruthenium hydroxide, which is simple to operate and suitable for mass production. However, part of the sodium chloride salt produced in the preparation process is attached to the surface of the precipitate in the form of free ions, and part is wrapped in the precipitate micelles, making it difficult to wash it clean. In addition, during the washing process, overly fine ruthenium hydroxide will form a colloid in the water, which is difficult to centrifuge and precipitate, resulting in a large number of washing times and large washing losses. Summary of the invention

[0007] One of the purposes of the present invention is to provide a method for preparing ruthenium hydroxide, which can obtain high-purity ruthenium hydroxide after washing and impurity removal, and the loss of ruthenium hydroxide is low, effectively avoiding the problems of excessive sodium chloride salt or excessive ruthenium hydroxide loss during the preparation and washing process of ruthenium hydroxide.

[0008] Another object of the present invention is to provide ruthenium hydroxide, which is prepared by the preparation method of ruthenium hydroxide of the present invention and has the advantages of high purity and high yield.

[0009] To achieve the above object, the present invention provides a method for preparing ruthenium hydroxide, comprising the following steps:

[0010] Step 1: Concentrating a first chlororuthenic acid solution having an acidity of 5 to 8 mol / L and a ruthenium content of 2 to 8 wt% by distilling acid to obtain a second chlororuthenic acid solution having an acidity of less than 3 mol / L;

[0011] Step 2: adding alkaline solution to the second chlororuthenic acid solution for precipitation treatment to obtain ruthenium hydroxide.

[0012] Furthermore, the specific operation of step 1 is: at a pressure of -0.06 to -0.08 MPa and a heating temperature of 180 to 200° C., a first chlororuthenic acid solution with an acidity of 5 to 8 mol / L and a ruthenium content of 2 to 8 wt% is concentrated by distillation to obtain a second chlororuthenic acid solution with an acidity of less than 3 mol / L, and stirring is continued during the process.

[0013] Preferably, the stirring speed in step 1 is 100 to 400 r / min.

[0014] Furthermore, the specific operation of step 2 is: heating the second chlororuthenic acid solution to 50-60° C. under stirring, slowly adding alkaline solution until the solution pH value is 7-8, standing and aging for 1-2 hours, separating the upper clear liquid, and then performing solid-liquid separation on the remaining part to obtain a separated liquid and ruthenium hydroxide.

[0015] Preferably, the stirring speed in step 2 is 100 to 400 r / m

[0016] Preferably, the alkali solution can be selected from potassium hydroxide solution, sodium hydroxide solution and ammonia water.

[0017] Further preferably, the concentration of the alkali solution is 1-2 mol / L.

[0018] More preferably, the dropping speed of the sodium hydroxide solution is 10-15 ml / min, and the concentration of the sodium hydroxide solution is 0.5-3 mol / L.

[0019] Furthermore, the preparation method of ruthenium hydroxide of the present invention further comprises step 3: sequentially subjecting the ruthenium hydroxide obtained in step 2 to ultrasonic dispersion, centrifugal washing, and drying treatments.

[0020] Furthermore, the specific operation of ultrasonic dispersion in step 3 is: adding ruthenium hydroxide to water at 50-70° C. for ultrasonic treatment, and the mass ratio of ruthenium hydroxide to water is 1:2-3.

[0021] Furthermore, the specific operation of the centrifugal washing in step 3 is: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000-4000 r / min for 3-5 minutes to separate the solid and liquid, so as to obtain high-purity ruthenium hydroxide.

[0022] Preferably, the ultrasonic dispersion and centrifugal washing in step 3 are repeated 7-10 times in sequence before drying.

[0023] More preferably, the conductivity of the liquid separated by each centrifugal washing is tested by a conductivity meter, and when the conductivity of the liquid is ≤50us / cm, subsequent drying treatment is performed.

[0024] Furthermore, the drying temperature of the drying treatment is 95-105°C.

[0025] The invention also discloses ruthenium hydroxide, which is prepared by adopting the above-mentioned preparation method of ruthenium hydroxide.

[0026] Beneficial Effects

[0027] Compared with the prior art, the present invention has at least the following advantages:

[0028] (1) The present invention utilizes the low boiling point and volatility of hydrochloric acid to concentrate a chlororuthenic acid solution in a specific acidity range into a chlororuthenic acid solution with an acidity of less than 3 mol / L by distillation, thereby fundamentally reducing chloride impurities in the subsequent preparation process of ruthenium hydroxide, thereby improving the purity of ruthenium hydroxide;

[0029] (2) The present invention can control the particle size of ruthenium hydroxide by controlling the ruthenium content of chlororuthenic acid in conjunction with the distillation and concentration treatment of chlororuthenic acid solution in a specific acidity range, thereby avoiding the problem of ruthenium hydroxide with too fine a particle size forming a colloid that is difficult to centrifuge and precipitate and resulting in washing losses, and also avoiding the problem of ruthenium hydroxide with too large a particle size encapsulating impurity ions, making it difficult to wash out the impurities and reducing the purity of ruthenium hydroxide. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0031] In order to explain the technical content of the present invention in detail, further description is given below in conjunction with the implementation modes.

[0032] The first chlororuthenic acid solution of the following examples and comparative examples is prepared by reacting ruthenium tetroxide produced by chlorination distillation of ruthenium powder with hydrochloric acid of corresponding concentration. The first chlororuthenic acid solution of the following examples and comparative examples is 500g.

[0033] Example 1

[0034] A ruthenium hydroxide is prepared by the following steps:

[0035] Step 1: A first chlororuthenic acid solution with an acidity of 5 mol / L and a ruthenium content of 6 wt% is concentrated by distillation at a pressure of -0.08 MPa and a heating temperature of 200° C. to obtain a second chlororuthenic acid solution with an acidity of 1.59 mol / L, and the solution is continuously stirred at a stirring speed of 100 r / min during the process;

[0036] Step 2: The second chlororuthenic acid solution is heated to 50° C. under stirring at 200 r / min, 1 mol / L sodium hydroxide solution is slowly added dropwise until the pH value of the solution is 7.35, and the solution is allowed to stand for 1 hour, the supernatant is separated, and the remaining part is subjected to solid-liquid separation to obtain a separated liquid and ruthenium hydroxide;

[0037] Step 3: adding ruthenium hydroxide to water at 60° C. for ultrasonic treatment, wherein the mass ratio of ruthenium hydroxide to water is 1:2;

[0038] Step 4: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000 r / min for 3 minutes to separate the solid and liquid, thereby obtaining high-purity ruthenium hydroxide;

[0039] Step 5: Repeat steps 3 and 4 10 times;

[0040] Step 6: Place in oven and dry at 100°C.

[0041] Example 2

[0042] A ruthenium hydroxide is prepared by the following steps:

[0043] Step 1: A first chlororuthenic acid solution with an acidity of 5.2 mol / L and a ruthenium content of 4.39 wt% is concentrated by distillation at a pressure of -0.08 MPa and a heating temperature of 200° C. to obtain a second chlororuthenic acid solution with an acidity of 0.79 mol / L, and the solution is continuously stirred at a stirring speed of 100 r / min during the process;

[0044] Step 2: The second chlororuthenic acid solution is heated to 50° C. under stirring at 200 r / min, 1 mol / L sodium hydroxide solution is slowly added dropwise until the pH value of the solution is 7.68, and the solution is allowed to stand for 1 hour, the supernatant is separated, and the remaining part is subjected to solid-liquid separation to obtain a separated liquid and ruthenium hydroxide;

[0045] Step 3: adding ruthenium hydroxide to water at 60° C. for ultrasonic treatment, wherein the mass ratio of ruthenium hydroxide to water is 1:2;

[0046] Step 4: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000 r / min for 3 minutes to separate the solid and liquid, thereby obtaining high-purity ruthenium hydroxide;

[0047] Step 5: Repeat steps 3 and 4 10 times;

[0048] Step 6: Place in oven and dry at 100°C.

[0049] Example 3

[0050] A ruthenium hydroxide is prepared by the following steps:

[0051] Step 1: A first chlororuthenic acid solution with an acidity of 7.46 mol / L and a ruthenium content of 2.13 wt% is concentrated by distillation at a pressure of -0.08 MPa and a heating temperature of 200° C. to obtain a second chlororuthenic acid solution with an acidity of 0.44 mol / L, and the solution is continuously stirred at a stirring speed of 100 r / min during the process;

[0052] Step 2: The second chlororuthenic acid solution is heated to 50° C. under stirring at 200 r / min, 1 mol / L sodium hydroxide solution is slowly added dropwise until the pH value of the solution is 7.81, and the solution is allowed to stand for 1 hour, the supernatant is separated, and the remaining part is subjected to solid-liquid separation to obtain a separated liquid and ruthenium hydroxide;

[0053] Step 3: adding ruthenium hydroxide to water at 60° C. for ultrasonic treatment, wherein the mass ratio of ruthenium hydroxide to water is 1:2;

[0054] Step 4: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000 r / min for 3 minutes to separate the solid and liquid, thereby obtaining high-purity ruthenium hydroxide;

[0055] Step 5: Repeat steps 3 and 4 10 times;

[0056] Step 6: Place in oven and dry at 100°C.

[0057] Example 4

[0058] A ruthenium hydroxide is prepared by the following steps:

[0059] Step 1: A first chlororuthenic acid solution with an acidity of 6.39 mol / L and a ruthenium content of 7.8 wt% is concentrated by distillation at a pressure of -0.08 MPa and a heating temperature of 200° C. to obtain a second chlororuthenic acid solution with an acidity of 2.28 mol / L, and the solution is continuously stirred at a stirring speed of 100 r / min during the process;

[0060] Step 2: The second chlororuthenic acid solution is heated to 50° C. under stirring at 200 r / min, 1 mol / L sodium hydroxide solution is slowly added dropwise until the pH value of the solution is 7.37, and the solution is allowed to stand for 1 hour, the supernatant is separated, and the remaining part is subjected to solid-liquid separation to obtain a separated liquid and ruthenium hydroxide;

[0061] Step 3: adding ruthenium hydroxide to water at 60° C. for ultrasonic treatment, wherein the mass ratio of ruthenium hydroxide to water is 1:2;

[0062] Step 4: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000 r / min for 3 minutes to separate the solid and liquid, thereby obtaining high-purity ruthenium hydroxide;

[0063] Step 5: Repeat steps 3 and 4 10 times;

[0064] Step 6: Place in oven and dry at 100°C.

[0065] Comparative Example 1

[0066] A ruthenium hydroxide is prepared by the following steps:

[0067] Step 1: heating a chlororuthenic acid solution with an acidity of 5.2 mol / L and a ruthenium content of 4.39 wt% to 50° C. under stirring at 200 r / min, slowly dropping a 1 mol / L sodium hydroxide solution until the solution pH value reaches 7.68, standing and aging for 1 hour, separating the supernatant, and then subjecting the remaining part to solid-liquid separation to obtain a separated liquid and ruthenium hydroxide;

[0068] Step 3: adding ruthenium hydroxide to water at 60° C. for ultrasonic treatment, wherein the mass ratio of ruthenium hydroxide to water is 1:2;

[0069] Step 4: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000 r / min for 3 minutes to separate the solid and liquid, thereby obtaining high-purity ruthenium hydroxide;

[0070] Step 5: Repeat steps 3 and 4 7 times;

[0071] Step 6: Place in oven and dry at 100°C.

[0072] Comparative Example 2

[0073] A ruthenium hydroxide is prepared by the following steps:

[0074] Step 1: heating a chlororuthenic acid solution with an acidity of 5.2 mol / L and a ruthenium content of 4.39 wt% to 50° C. under stirring at 200 r / min, slowly dropping a 1 mol / L sodium hydroxide solution until the solution pH value reaches 7.68, standing and aging for 1 hour, separating the supernatant, and then subjecting the remaining part to solid-liquid separation to obtain a separated liquid and ruthenium hydroxide;

[0075] Step 3: adding ruthenium hydroxide to water at 60° C. for ultrasonic treatment, wherein the mass ratio of ruthenium hydroxide to water is 1:2;

[0076] Step 4: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000 r / min for 3 minutes to separate the solid and liquid, thereby obtaining high-purity ruthenium hydroxide;

[0077] Step 5: Repeat steps 3 and 4 10 times;

[0078] Step 6: Place in oven and dry at 100°C.

[0079] Comparative Example 3

[0080] A ruthenium hydroxide is prepared by the following steps:

[0081] Step 1: A first chlororuthenic acid solution with an acidity of 5.2 mol / L and a ruthenium content of 1.77 wt% is concentrated by distillation at a pressure of -0.08 MPa and a heating temperature of 200° C. to obtain a second chlororuthenic acid solution with an acidity of 0.79 mol / L, and the solution is continuously stirred at a stirring speed of 100 r / min during the process;

[0082] Step 2: The second chlororuthenic acid solution is heated to 50° C. under stirring at 200 r / min, 1 mol / L sodium hydroxide solution is slowly added dropwise until the pH value of the solution is 7.68, and the solution is allowed to stand for 1 hour, the supernatant is separated, and the remaining part is subjected to solid-liquid separation to obtain a separated liquid and ruthenium hydroxide;

[0083] Step 3: adding ruthenium hydroxide to water at 60° C. for ultrasonic treatment, wherein the mass ratio of ruthenium hydroxide to water is 1:2;

[0084] Step 4: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000 r / min for 3 minutes to separate the solid and liquid, thereby obtaining high-purity ruthenium hydroxide;

[0085] Step 5: Repeat steps 3 and 4 10 times;

[0086] Step 6: Place in oven and dry at 100°C.

[0087] Comparative Example 4

[0088] A ruthenium hydroxide is prepared by the following steps:

[0089] Step 1: A first chlororuthenic acid solution with an acidity of 5.2 mol / L and a ruthenium content of 10.77 wt% is concentrated by distillation at a pressure of -0.08 MPa and a heating temperature of 200° C. to obtain a second chlororuthenic acid solution with an acidity of 0.79 mol / L, and the solution is continuously stirred at a stirring speed of 100 r / min during the process;

[0090] Step 2: The second chlororuthenic acid solution is heated to 50° C. under stirring at 200 r / min, 1 mol / L sodium hydroxide solution is slowly added dropwise until the pH value of the solution is 7.68, and the solution is allowed to stand for 1 hour, the supernatant is separated, and the remaining part is subjected to solid-liquid separation to obtain a separated liquid and ruthenium hydroxide;

[0091] Step 3: adding ruthenium hydroxide to water at 60° C. for ultrasonic treatment, wherein the mass ratio of ruthenium hydroxide to water is 1:2;

[0092] Step 4: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000 r / min for 3 minutes to separate the solid and liquid, thereby obtaining high-purity ruthenium hydroxide;

[0093] Step 5: Repeat steps 3 and 4 10 times;

[0094] Step 6: Place in oven and dry at 100°C.

[0095] The ruthenium hydroxide obtained in step 2 of the preparation process of Example 1-4 and Comparative Example 1-4 was weighed dry, and the ruthenium hydroxide finally obtained was weighed to calculate the yield of ruthenium hydroxide, and the content of sodium ions in ruthenium hydroxide was detected to confirm the impurity content. The results are shown in Table 1;

[0096] Table 1 Detection results of ruthenium hydroxide in Examples 1-4 and Comparative Examples 1-4

[0097]

[0098] According to the results in Table 1, we can see that:

[0099] According to the data of Examples 1-4, the present invention can control the particle size of ruthenium hydroxide by controlling the ruthenium content of chlororuthenic acid in conjunction with the acid distillation and concentration treatment of chlororuthenic acid solution in a specific acidity range, thereby avoiding the formation of colloids of ruthenium hydroxide with too fine a particle size, which is difficult to centrifuge and precipitate, resulting in washing losses, and preventing the impurity ions from being wrapped due to the large particle size of ruthenium hydroxide, making it difficult to wash out the impurities and reducing the purity of ruthenium hydroxide.

[0100] According to the data comparison between Example 2 and Comparative Examples 1 and 2, it can be known that the present invention can control the particle size of ruthenium hydroxide by controlling the ruthenium content of chlororuthenic acid in conjunction with the acid distillation and concentration treatment operation of chlororuthenic acid solution in a specific acidity range, thereby avoiding the formation of colloid of ruthenium hydroxide with too fine particle size that is difficult to centrifuge and precipitate, resulting in washing loss; Comparative Examples 1 and 2 do not perform acid distillation treatment, resulting in the removal of the obtained ruthenium hydroxide during the washing process, wherein Comparative Example 1 has a higher ruthenium recovery rate than Comparative Example 2 due to the fewer washing times, but due to the reduced washing times, the impurities are not washed cleanly, resulting in a high content of sodium ions in the product.

[0101] According to the data comparison between Example 2 and Comparative Examples 3 and 4, it can be seen that the technical solution of the present invention also needs to control the ruthenium content of the chlororuthenic acid solution; too low ruthenium content, such as in Comparative Example 3, will result in the final ruthenium hydroxide particle size being generally small, resulting in more ruthenium hydroxide forming colloids during the washing process that are difficult to centrifuge and precipitate, resulting in washing losses; and too high ruthenium content will result in the final ruthenium hydroxide particle size being too large, wrapping the impurity ions and making it difficult to wash out the impurities. Therefore, in the product obtained in Comparative Example 4, the sodium ion impurity content is significantly increased.

[0102] The embodiments presented herein are only embodiments selected according to the combination of all possible embodiments. The appended claims should not be limited by the embodiments describing the present invention. Some numerical ranges used in the claims include sub-ranges therein, and the changes in these ranges should also be covered by the appended claims.

Claims

1. A method for preparing ruthenium hydroxide, characterized in that: The steps include: Step 1: Concentrating a first chlororuthenic acid solution having an acidity of 5 to 8 mol / L and a ruthenium content of 2 to 8 wt% by distilling acid to obtain a second chlororuthenic acid solution having an acidity of less than 3 mol / L; Step 2: adding alkaline solution to the second chlororuthenic acid solution for precipitation treatment to obtain ruthenium hydroxide.

2. The method for preparing ruthenium hydroxide according to claim 1, wherein The specific operation of step 1 is: the first chlororuthenic acid solution with an acidity of 5 to 8 mol / L and a ruthenium content of 2 to 8 wt% is concentrated by distillation at a pressure of -0.06 to -0.08 MPa and a heating temperature of 180 to 200° C. to obtain a second chlororuthenic acid solution with an acidity of less than 3 mol / L, and continuous stirring during the process.

3. The preparation method of ruthenium hydroxide according to claim 1, characterized in that The specific operation of step 2 is: heating the second chlororuthenic acid solution to 50-60° C. under stirring, slowly adding liquid alkali until the pH value of the solution is 7-8, standing and aging for 1-2 hours, separating the upper clear liquid, and then performing solid-liquid separation on the remaining part to obtain a separated liquid and ruthenium hydroxide.

4. The method for preparing ruthenium hydroxide according to claim 1 or 3, characterized in that The liquid alkali can be selected from potassium hydroxide, sodium hydroxide, and ammonia water, and the concentration of the alkali solution is 1-2 mol / L.

5. The method for preparing ruthenium hydroxide according to claim 1, wherein The method further comprises step 3: sequentially subjecting the ruthenium hydroxide obtained in step 2 to ultrasonic dispersion, centrifugal washing and drying.

6. The method for preparing ruthenium hydroxide according to claim 5, wherein The specific operation of ultrasonic dispersion in step 3 is: adding ruthenium hydroxide to water at 50-70° C. for ultrasonic treatment, and the mass ratio of ruthenium hydroxide to water is 1:2-3.

7. The method for preparing ruthenium hydroxide according to claim 5, wherein The specific operation of the centrifugal washing in step 3 is: centrifuging the mixture of ruthenium hydroxide and water after ultrasonic treatment at a speed of 3000-4000 r / min for 3-5 minutes to separate the solid and liquid, so as to obtain high-purity ruthenium hydroxide.

8. The method for preparing ruthenium hydroxide according to any one of claims 5 to 7, wherein: The ultrasonic dispersion and centrifugal washing in step 3 are repeated 7-10 times in sequence and then dried.

9. A ruthenium hydroxide, characterized in that The ruthenium hydroxide is prepared by the method for preparing ruthenium hydroxide as described in any one of claims 1 to 8.

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