Treatment method of alkaline hydrogen production electrode activating solution

Abstract

The invention discloses a treatment method of an alkaline hydrogen production electrode activation solution, and belongs to the technical field of alkaline hydrogen production electrode activation solution treatment, and the treatment method comprises the following steps: S1, putting an activation material into an activation pool, adding the activation solution, enabling the activation solution to submerge the activation material, and treating the activation solution, the mass of the activation solution being 3-10 times of the mass of the activation material; s2, after activation is finished, activating liquid is filtered and discharged into a settling pond, a precipitator is added and stirred, and the adding amount of the precipitator is 1-1.3 times of the loss mass of the activating material; s3, solid-liquid separation is formed after the precipitant and the activating solution react, the liquid is discharged into a purifying pond, standing is conducted after a purifying agent is added, and the adding amount of the purifying agent is 1-1.2 times of the molar weight of calcium ions in the solution; and S4, discharging the liquid after standing into a heating tank, and heating to a set temperature for later use. According to the invention, the activation solution is effectively treated, the treatment cost of the activation solution is reduced, the treated activation solution can be effectively utilized, and the utilization rate of resources is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of alkaline hydrogen production electrode activation solution treatment, and in particular relates to a method for treating alkaline hydrogen production electrode activation solution. Background Art

[0002] Hydrogen production by water electrolysis is a convenient and relatively efficient method for producing hydrogen, and the current mainstream method for hydrogen production by water electrolysis is alkaline water electrolysis. Currently, the electrodes for hydrogen production by alkaline water electrolysis generally use nickel mesh-loaded catalyst electrodes. From the current development of water electrolysis catalysts, porous metal substrates are often used as electrode skeletons to support catalytic reaction active centers due to their large specific surface area, moderate pore structure and sufficient mechanical strength.

[0003] In order to obtain a large specific surface area, pore-forming agents or substances that play a pore-forming role are often added during the process of electrode loading catalysts. These substances often need to be activated before the electrode is used. At present, commonly used alkaline water electrolysis catalysts, such as Raney nickel, need to be activated before electrolysis of water to produce hydrogen. The aluminum therein is etched to form a porous structure to increase the specific surface area of ​​the electrode, thereby generating a large amount of activation solution. At present, the treatment of the activation solution is usually to directly treat it as waste alkaline water, which will increase the treatment cost of the activation solution in actual treatment and also cause waste of resources. Therefore, how to effectively treat and utilize the activation solution is a problem that needs to be solved urgently. Summary of the invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a method for treating an alkaline hydrogen production electrode activation solution to solve the problems existing in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a method for treating an alkaline hydrogen production electrode activation solution, comprising the following steps:

[0006] S1. Put the activated material into the activation pool, add the activation solution, and make the activation solution submerge the activated material, and process the activation solution. The mass of the activation solution is 3-10 times the mass of the activated material;

[0007] S2. After activation, the activated liquid is filtered and discharged into a sedimentation tank, and a precipitant is added for stirring. The amount of the precipitant added is 1-1.3 times the mass loss of the activated material;

[0008] S3, after the precipitant and the activation liquid react, solid-liquid separation is formed, the liquid is discharged into the purification tank, and the purifier is added and allowed to stand. The amount of the purifier added is 1-1.2 times the molar amount of calcium ions in the solution;

[0009] S4, discharge the liquid after standing to the heating tank, heat it to the set temperature and set it aside.

[0010] In a preferred embodiment of the present invention, the activation material is a Raney nickel electrode or a pore-forming nickel-based electrode, and the activation material contains pore-forming components aluminum and silicon dioxide.

[0011] In a preferred embodiment of the present invention, in step S1, the activation solution is a 10-30% sodium hydroxide solution or a 10-30% potassium hydroxide solution.

[0012] In a preferred embodiment of the present invention, the precipitant is calcium oxide or calcium hydroxide.

[0013] In a preferred embodiment of the present invention, the purifier is one of sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate.

[0014] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0015] 1. The present invention realizes the effective treatment of the activation liquid, reduces the treatment cost of the activation liquid, and the activated liquid after treatment can be effectively utilized, thereby improving the utilization rate of resources;

[0016] 2. The precipitate obtained in the sedimentation tank is calcium aluminate or calcium silicate, which can be used as a raw material for preparing pore-forming agents and is also a chemical raw material, thus realizing the recycling of resources;

[0017] 3. The chemical reagents used in the present invention are simple, easy to obtain, and low in price, which effectively reduces the cost, and there is no pollutant emission in the entire process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0019] Figure 1 A flowchart of a preferred embodiment of the present invention; DETAILED DESCRIPTION

[0020] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many physical details will be described together in the following description. However, it should be understood that these physical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these physical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0021] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] Embodiment 1

[0023] S1. Place the Raney nickel electrode in an activation tank, add an activation solution containing 10% sodium hydroxide until the activation solution submerges the Raney nickel electrode. The mass of the activation solution is 5 times the mass of the electrode. The sodium hydroxide reacts chemically with the aluminum in the Raney nickel: 2NaOH+2Al+2H2O=2NaAlO2+3H2↑;

[0024] S2. After the activation is completed, the activation liquid is filtered and discharged into a sedimentation tank, and calcium oxide is added. The mass of calcium oxide is 1.1 times the mass of the electrode activation loss, and stirred. The calcium oxide is hydrated to form calcium hydroxide:, and calcium hydroxide reacts with sodium aluminate to form calcium aluminate precipitate: Ca(OH)2+2NaAlO2=Ca(AlO2)2↓+2NaOH. Calcium aluminate can be used as a raw material for extracting aluminum oxide, and can also be used as a chemical raw material for preparing cement, etc.;

[0025] S3. After the reaction is complete, the solid and liquid are separated, and the liquid is discharged into the purification tank. Sodium carbonate is added, and the ratio of the molar amount of sodium carbonate to the molar amount of calcium ions in the solution is 1.2:1. After standing, the sodium carbonate reacts with the excess calcium hydroxide to further remove the calcium ions: Ca(OH)2+2Na2CO3=CaCO3↓+2NaOH;

[0026] S4, discharge the solution after standing to the heating tank, heat it to the set temperature for use.

[0027] Embodiment 2

[0028] S1. Place the pore-forming nickel-based electrode in an activation tank, add an activation solution containing 10% potassium hydroxide at 80°C until the pore-forming nickel-based electrode is submerged. The mass of the activation solution is 10 times the mass of the electrode. Potassium hydroxide reacts chemically with the silicon dioxide in the electrode: 2KOH+SiO2+2H2O=K2SiO3+H2O;

[0029] S2. After activation, filter the sodium hydroxide solution and discharge it into a sedimentation tank, add calcium hydroxide, the mass of calcium oxide is 1.3 times the mass of electrode activation loss, stir, calcium hydroxide and potassium silicate react to form calcium aluminate precipitate: Ca(OH)2+K2SiO3=CaSiO3↓+2KOH, wherein calcium silicate can be used as a raw material for preparing silicon dioxide, and can also be used as a chemical raw material for calcining cement and other production products;

[0030] S3. After the reaction is complete, the solid and liquid are separated, and the liquid is discharged into the purification tank. Potassium carbonate is added, and the ratio of the molar amount of potassium carbonate to the molar amount of calcium ions in the solution is 1.1:1. After standing, sodium carbonate reacts with excess calcium hydroxide to further remove calcium ions: Ca(OH)2+2K2CO3=CaCO3↓+2KOH;

[0031] S4. Drain the solution after standing to a heating tank and heat it to 80°C for later use.

[0032] In combination with Example 1 and Example 2, the solution finally formed in the present invention is the activated solution after treatment, and the calcium aluminate or calcium silicate obtained in the precipitation can be used as a raw material for preparing a pore-forming agent, and is also a chemical raw material, thereby realizing the recycling of resources. In addition, the chemical reagents used in this embodiment are simple and easy to obtain, low in price, effectively reducing costs, and the entire process has no pollutant emissions.

[0033] Although the present invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the present invention. That is, the methods, systems or devices discussed above are all examples. Various configurations may appropriately omit, replace or add various processes or components. For example, in alternative configurations, the method may be performed in an order different from the order described, and / or various stages may be added, omitted and / or combined. Moreover, the features described with respect to certain configurations may be combined in various other configurations. Different aspects and elements of the configurations may be combined in a similar manner. In addition, with the development of technology, many elements are merely examples and do not limit the scope of the present disclosure or claims.

[0034] Specific details are given in the specification to provide a thorough understanding of the exemplary configurations including implementations. However, the configurations can be practiced without these specific details, for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary details to avoid obscuring the configurations. This description provides only example configurations and does not limit the scope, applicability, or configurations of the claims. On the contrary, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made to the functions and arrangements of the elements without departing from the spirit or scope of the present disclosure.

[0035] In addition, although each operation may describe the operation as a sequential process, many operations may be performed in parallel or simultaneously. In addition, the order of the operations may be rearranged. A process may have additional steps. In addition, examples of methods may be implemented by hardware, software, firmware, middleware, code, hardware description language, or any combination thereof. When implemented in software, firmware, middleware, or code, program code or code segments for performing the necessary tasks may be stored in a non-transitory computer-readable medium such as a storage medium, and the described tasks are performed by a processor.

[0036] In summary, it is intended that the above detailed description is considered to be exemplary rather than restrictive, and it should be understood that the claims (including all equivalents) are intended to limit the spirit and scope of the present invention. The above embodiments should be understood to be only used to illustrate the present invention and not to limit the scope of protection of the present invention. After reading the content of the record of the present invention, the technician can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall into the scope limited by the claims of the present invention.

Claims

1. A method for treating an alkaline hydrogen production electrode activation solution, characterized in that: The following steps are involved: S1. Put the activated material into the activation pool, add the activation solution, and make the activation solution submerge the activated material, and process the activation solution. The mass of the activation solution is 3-10 times the mass of the activated material; S2. After activation, the activated liquid is filtered and discharged into a sedimentation tank, and a precipitant is added for stirring. The amount of the precipitant added is 1-1.3 times the mass loss of the activated material; S3, after the precipitant and the activation liquid react, solid-liquid separation is formed, the liquid is discharged into the purification tank, and the purifier is added and allowed to stand. The amount of the purifier added is 1-1.2 times the molar amount of calcium ions in the solution; S4, discharge the liquid after standing to the heating tank, heat it to the set temperature and set it aside.

2. The method for treating an alkaline hydrogen production electrode activation solution according to claim 1, characterized in that: The activation material is a Raney nickel electrode or a pore-forming nickel-based electrode, and the activation material contains pore-forming components aluminum and silicon dioxide.

3. The method for treating an alkaline hydrogen production electrode activation solution according to claim 1, characterized in that: In step S1, the activation solution is a 10-30% sodium hydroxide solution or a 10-30% potassium hydroxide solution.

4. The method for treating an alkaline hydrogen production electrode activation solution according to claim 1, characterized in that: The precipitant is calcium oxide or calcium hydroxide.

5. The method for treating an alkaline hydrogen production electrode activation solution according to claim 1, characterized in that: The purifier is one of sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate.

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