Method for preparing dehumidification material by utilizing rotating wheel recycled waste and preparation method of dehumidification rotating wheel

Abstract

The invention discloses a method for preparing a dehumidification material by utilizing a rotating wheel recycled waste material and a preparation method of a dehumidification rotating wheel, and the method comprises the following steps: adopting water glass as an adhesive, adding powder of a silica gel rotating wheel waste material into the water glass, uniformly mixing to obtain mixed slurry, and then coating or dipping and drying a base material by adopting the mixed slurry to obtain the dehumidification material. A dehumidification material precursor is obtained; in the drying process, part of silicate is converted into a silica gel structure; the dehumidification material precursor is put into an acid solution to react, then washed, put into ammonia water to be aged, washed and dried, and the dehumidification material is obtained; the dehumidification performance of the dehumidification material prepared by the method can reach basically the same degree as that of a common silica gel rotating wheel, the formula can be adjusted according to different requirements to achieve different purposes, and the dehumidification material has the advantages of being flexible in formula and easy to adjust and can be used for preparing the dehumidification rotating wheel.

Description

[0001] This invention is a divisional application of Chinese invention patent application filed on December 7, 2022, with application number 2022115615253 and titled "A method for preparing dehumidifying materials using a rotary wheel to recover waste materials and the dehumidifying materials made therefrom". Technical Field

[0002] This invention relates to the field of gas dehumidification technology, specifically to a method for preparing dehumidification materials using a rotary wheel to recover waste materials and a method for preparing a dehumidification rotary wheel. Background Technology

[0003] In recent years, with the continuous development of rotary dehumidification technology, more and more occasions have begun to use dehumidification rotary systems for humidity control. The core of this system is the dehumidification rotary wheel core, which serves as the adsorption material. The most commonly used core material is silica gel. Usually, these silica gel rotary wheels are quite expensive, and after a certain number of years of use, they will become unusable due to cracking, clogging, damage to the support structure, and other reasons. The unusable cores are often directly treated as solid waste, resulting in waste.

[0004] In addition, the silica gel adsorbent material used in the wheel core is often made in the form of a cuboid during preparation. Therefore, the production of the wheel is often accompanied by cutting waste, which is usually treated as solid waste because it is difficult to utilize. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to overcome one or more deficiencies in the prior art and provide a new method for preparing dehumidifying materials using recycled waste. This method can recycle and reuse the waste generated during the production and disposal of silica gel dehumidifying wheels to prepare dehumidifying materials with dehumidifying performance that is basically the same as that of commonly used silica gel wheels.

[0006] The present invention also provides a dehumidifying material prepared by the above method and its application in the preparation of a dehumidifying impeller.

[0007] To solve the above technical problems, the present invention adopts the following technical solution: A method for preparing dehumidifying materials using a rotary wheel to recycle waste materials, the method comprising: Water glass is used as an adhesive. Powdered silica gel wheel waste is added to the water glass while continuously stirring and mixed to obtain a mixed slurry. The water glass is an aqueous solution of silicate as shown in formula (I), R2O·nSiO2 (I), where R is an alkali metal and n is the modulus of silicate. The substrate is coated or impregnated with the mixed slurry and dried to obtain a dehumidifying material precursor. The dehumidifying material precursor is placed in an acid solution and reacted at a temperature of 30-80℃. After the reaction, it is rinsed until the pH value of the wash solution is 5.5-6.5. Then, it is placed in ammonia water and aged at a temperature of 20-60℃. After aging, it is rinsed until the wash solution is neutral and dried to obtain the dehumidifying material.

[0008] Another technical solution provided by the present invention: a method for preparing dehumidifying materials using a rotary wheel to recycle waste, the method comprising: Collect waste silicone rollers and process them into powder; Water glass is used as an adhesive. The powder is added to the water glass and mixed to obtain a mixed slurry. The mixed slurry is then used to coat or impregnate the substrate and dried to obtain a dehumidifying material precursor. The water glass is an aqueous solution of silicate as shown in formula (I), R2O·nSiO2 (I), where R is an alkali metal and n is the modulus of silicate. During the drying process, some silicate undergoes a transformation to a silica gel structure. The precursor of the dehumidifying material is placed in an acid solution to react, then rinsed, and then aged in ammonia water.

[0009] In this invention, water glass exists partly as an adhesive, and therefore its concentration is relatively low. According to some preferred aspects of the invention, the silicate content in the water glass is 3%-20% by mass.

[0010] In some embodiments of the present invention, the silicate content in the water glass is 3%-5% by mass. In some embodiments of the present invention, the silicate content in the water glass is 5%-10% by mass. In some embodiments of the present invention, the silicate content in the water glass is 10%-15% by mass. In some embodiments of the present invention, the silicate content in the water glass is 15%-20% by mass.

[0011] According to some preferred aspects of the present invention, the powder is added in an amount of 1%-30% by weight of the water glass. In some embodiments of the present invention, the powder is added in an amount of 1%-5% by weight of the water glass. In some embodiments of the present invention, the powder is added in an amount of 5%-10% by weight of the water glass. In some embodiments of the present invention, the powder is added in an amount of 10%-15% by weight of the water glass. In some embodiments of the present invention, the powder is added in an amount of 15%-20% by weight of the water glass. In some embodiments of the present invention, the powder is added in an amount of 20%-25% by weight of the water glass. In some embodiments of the present invention, the powder is added in an amount of 25%-30% by weight of the water glass.

[0012] According to some preferred aspects of the invention, the mass ratio of the powder to the silicate in the water glass is 1:0.5-2.5. Further, the mass ratio of the powder to the silicate in the water glass is 1:0.5-2.0. According to some preferred and specific aspects of the invention, the mass ratio of the powder to the silicate in the water glass is 1:0.55-1.85.

[0013] According to some preferred aspects of the invention, R is sodium, and n is 2.2-3.5. When R is sodium, the silicate is sodium silicate, and its aqueous solution is sodium silicate.

[0014] In this invention, sodium silicate can be obtained commercially, for example, high-concentration sodium silicate can be purchased and then diluted to the required concentration as needed.

[0015] According to some preferred aspects of the present invention, when the mixed slurry is used to treat the substrate by impregnation, the impregnation time is 0.5-3 hours, and the mixture is kept stirred during the impregnation process to prevent the powder from settling.

[0016] According to some preferred aspects of the invention, the drying process is carried out at 60-120°C when the dehumidifying material precursor is obtained.

[0017] According to some preferred and specific aspects of the invention, the particle size of the powder is 100-300 mesh.

[0018] According to some specific aspects of the present invention, silica gel roller waste can be cut into smaller intermediate sizes and then dry ball milled in a ball mill to obtain powder of the desired particle size.

[0019] According to some specific aspects of the present invention, the silicone roller waste is subjected to a process to remove surface paint before use.

[0020] According to the present invention, the scrap of silicone rollers is caused by non-material performance degradation such as cracking and blockage. For example, it may come from cutting waste generated during roller production, or scrap generated due to various reasons such as cracking, blockage, and damage to the support structure.

[0021] According to some specific aspects of the present invention, the substrate is a glass fiber substrate and may be honeycomb in shape.

[0022] According to some preferred aspects of the present invention, the acid solution is an aqueous solution of sulfuric acid with a mass concentration of 5%-25%.

[0023] According to some preferred aspects of the present invention, the reaction temperature after adding acid is 30-80°C, the reaction time is 1-8 hours, and the washing is continued until the pH of the washing solution is 5.5-6.5.

[0024] According to some preferred aspects of the invention, the mass concentration of the ammonia water used in the aging process is 2%-10%.

[0025] According to some preferred aspects of the present invention, the aging time is 2-36 hours, the aging temperature is 20-60°C, after aging is completed, the material is rinsed until the washing liquid is neutral, and finally it is placed in an oven to dry to obtain the dehumidifying material.

[0026] In this invention, the optimal balance between pore volume and specific surface area can be achieved by controlling the aging conditions.

[0027] Another technical solution provided by the present invention: a dehumidifying material made by the method described above.

[0028] Another technical solution provided by the present invention: the application of a dehumidifying material prepared by the above-described method in the preparation of a dehumidifying impeller.

[0029] Due to the adoption of the above technical solutions, the present invention has the following advantages compared with the prior art: Based on extensive experimentation and dedicated research, the inventors of this invention, starting from the recycling of silica gel waste, and considering the significant decrease in the dehumidification performance of the waste, did not simply use adhesives such as silica sol or sodium carboxymethyl cellulose to load the waste powder onto the glass fiber substrate. Instead, they utilized water glass, which can generate silica gel in situ, as the adhesive for coating. This method offers at least two advantages: Firstly, the powder adheres more strongly after coating. Powder coated with water glass has strong adhesion, so there is almost no powder shedding. Furthermore, some of the water glass, after drying and curing, forms the basic structure of silica gel. The subsequent reaction with acid primarily removes sodium carbonate mixed in the silica gel formed by the water glass and creates pores (the water glass, after drying...). During the drying process, it reacts with carbon dioxide to produce silicic acid and sodium carbonate. The silicic acid forms silicic acid gel (silica gel), so it has little effect on the adhesion. Even after the reaction, no powder will fall off. However, when using adhesives such as silica sol for coating, the powder on the sample surface is often easier to fall off after drying. Secondly, water glass itself can be used to prepare silica gel. Therefore, after reacting with acid, it can also be converted into hygroscopic silica gel and generate byproducts that can be used as desiccant, thus improving hygroscopicity. This avoids the disadvantage of silica gel powder losing its hygroscopicity after being coated with adhesive, and can effectively solve the problem of a significant decrease in the dehumidification performance of recycled materials. In addition, this invention further combines ammonia aging, which can not only improve the quality of silica gel prepared by water glass, but also achieve the effect of pore expansion. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the adsorption performance testing process of the present invention; Figure 2 The images show the dehumidification effect of the materials obtained in Examples 1-4 and Comparative Examples 1-4 of this invention. Detailed Implementation

[0031] The following examples, along with several embodiments of the present invention, will better illustrate the technical approach and implementation effects of the present invention. These embodiments are merely examples of the present invention and not intended to limit the scope of the invention. Other embodiments obtained by researchers in the art based on the technical solutions of the present invention should fall within the protection scope of the present invention.

[0032] Unless otherwise specified, all raw materials described below may be commercially available or prepared using conventional methods in the art. In the following examples, the "commercially available turbine core material" mentioned in the examples or comparative examples may be from the same manufacturer.

[0033] Example 1: This example provides a method for preparing dehumidifying materials using a rotary wheel to recover waste. The preparation method includes: Collect several pieces of wheel core material from a commercially available spool that had been rendered unusable due to cracking. Remove the painted parts from the surface and cut them into pieces approximately 5cm in size. 3 After the blocks of various sizes are placed into a horizontal ball mill, they are ground using the dry ball milling method. After grinding, 2.0 kg of 300-mesh powder is sieved and collected for later use.

[0034] Prepare 10.0 kg of sodium silicate with a mass concentration of 20% (modulus 3.3). Add 2.0 kg of prepared powder to it while stirring continuously, and then continue stirring for 2 hours to evenly disperse it in the silicate to obtain the powder / silica mixture slurry.

[0035] The honeycomb-shaped glass fiber substrate was immersed in the obtained powder / water glass mixture for 1 hour while stirring. Then the substrate loaded with the mixture was removed and placed in an oven (90°C) to dry.

[0036] Prepare 5.0 kg of 15% dilute sulfuric acid. Then, place the dried sample into the dilute sulfuric acid and react at 65°C for 3 hours. After the reaction is complete, remove the sample and rinse it with water until the pH of the washing solution reaches 6.

[0037] Prepare 10.0 kg of dilute ammonia solution with a mass fraction of 6%, then place the washed sample into the dilute ammonia solution and age it at 40°C for 6 hours. After aging, wash it again with clean water until the washing liquid is neutral. Finally, place the sample in an oven (105°C) to dry it to obtain the dehumidifying material prepared by the rotary wheel recycling waste.

[0038] Example 2: This example provides a method for preparing dehumidifying materials using a rotary wheel to recover waste. The preparation method includes: Collect several pieces of wheel core material from a commercially available spool that had been rendered unusable due to cracking. Remove the painted parts from the surface and cut them into pieces approximately 5cm in size. 3 After grinding the lumps into small pieces, they were placed in a horizontal ball mill and ground using a dry ball milling method. After grinding, 1.0 kg of 200-mesh powder was sieved and collected for later use.

[0039] Prepare 10.0 kg of sodium silicate with a mass concentration of 15% (modulus 2.6). Add 1.0 kg of prepared powder to it while stirring continuously, and then continue stirring for 1 hour to evenly disperse it in the silicate to obtain the powder / silica mixture slurry.

[0040] The honeycomb-shaped glass fiber substrate was immersed in the obtained powder / water glass mixture for 1 hour while stirring. Then the substrate loaded with the mixture was removed and placed in an oven (90°C) to dry.

[0041] Prepare 5.0 kg of dilute sulfuric acid with a mass concentration of 18%, then place the dried sample into the dilute sulfuric acid and react at 60°C for 4 hours. After the reaction is complete, remove the sample and rinse it with water until the pH of the washing solution reaches 6.

[0042] Prepare 10.0 kg of dilute ammonia solution with a mass fraction of 8%, then place the washed sample into the dilute ammonia solution and age it at 30°C for 12 hours. After aging, wash it again with clean water until the washing liquid is neutral. Finally, place the sample in an oven (105°C) to dry it to obtain the dehumidifying material prepared by the rotary wheel recycling waste.

[0043] Example 3: This example provides a method for preparing dehumidifying materials using a rotary wheel to recover waste. The preparation method includes: Collect a quantity of waste material from the assembly of a commercially available rotary wheel core, remove surface stains, and cut it into pieces approximately 5cm in size. 3 After the blocks of various sizes are placed into a horizontal ball mill, they are ground using the dry ball milling method. After grinding, 3.0 kg of 300-mesh powder is sieved and collected for later use.

[0044] Prepare 10.0 kg of sodium silicate with a mass concentration of 15% (modulus 2.2). Add 3.0 kg of prepared powder to it while stirring continuously, and then continue stirring for 3 hours to evenly disperse it in the silicate to obtain the powder / silica mixture slurry.

[0045] The honeycomb-shaped glass fiber substrate was immersed in the obtained powder / water glass mixture for 1 hour while stirring. Then the substrate loaded with the mixture was removed and placed in an oven (90°C) to dry.

[0046] Prepare 5.0 kg of 10% dilute sulfuric acid. Then, place the dried sample into the dilute sulfuric acid and react at 40°C for 6 hours. After the reaction is complete, take out the sample and rinse it with water until the pH of the washing solution reaches 6.

[0047] Prepare 10.0 kg of dilute ammonia solution with a mass fraction of 5%. Then, place the washed sample into the dilute ammonia solution and age it at 20°C for 18 hours. After aging, wash it again with clean water until the washing liquid is neutral. Finally, place the sample in an oven (105°C) to dry it to obtain the dehumidifying material prepared by the rotary wheel recycling waste.

[0048] Example 4: This example provides a method for preparing dehumidifying materials using a rotary wheel to recover waste. The preparation method includes: Collect several pieces of wheel core material from a commercially available spool that had been rendered unusable due to cracking. Remove the painted parts from the surface and cut them into pieces approximately 5cm in size. 3After grinding the lumps into small pieces, they were placed in a horizontal ball mill and ground using a dry ball milling method. After grinding, 1.5 kg of 100-mesh powder was sieved and collected for later use.

[0049] Prepare 10.0 kg of sodium silicate with a mass concentration of 10% (modulus 3.5). Add 1.5 kg of prepared powder to it while stirring continuously, and then continue stirring for 1.5 h to evenly disperse it in the silicate to obtain the powder / silica mixture slurry.

[0050] The honeycomb-shaped glass fiber substrate was immersed in the obtained powder / water glass mixture for 0.5 hours while being stirred. Then the substrate loaded with the mixture was removed and placed in an oven (90°C) to dry.

[0051] Prepare 5.0 kg of 12% dilute sulfuric acid. Then, place the dried sample into the dilute sulfuric acid and react at 80°C for 2 hours. After the reaction is complete, remove the sample and rinse it with water until the pH of the washing solution reaches 6.

[0052] Prepare 10.0 kg of dilute ammonia solution with a mass fraction of 3%. Then, place the washed sample into the dilute ammonia solution and age it at 60°C for 3 hours. After aging, wash it again with clean water until the washing liquid is neutral. Finally, place the sample in an oven (105°C) to dry it to obtain the dehumidifying material prepared by the rotary wheel recycling waste.

[0053] Comparative Example 1: The wheel core material used in Example 1 is a commercially available rotary wheel.

[0054] Comparative Example 2: Collect several pieces of wheel core material from a commercially available spool that had been rendered unusable due to cracking. Remove the painted parts from the surface and cut them into pieces approximately 5cm in size. 3 After the blocks of various sizes are placed into a horizontal ball mill, they are ground using the dry ball milling method. After grinding, 2.0 kg of 300-mesh powder is sieved and collected for later use.

[0055] Prepare 10.0 kg of silica sol with a mass concentration of 20%, and add 2.0 kg of prepared powder to it while stirring continuously. Then continue stirring for 2 hours to evenly disperse the powder / silica sol mixture into the silica sol to obtain the powder / silica sol mixture slurry.

[0056] Soak the honeycomb-shaped glass fiber substrate in the obtained powder / silica sol mixture for 1 hour while stirring. Then, take out the substrate loaded with the mixture and dry it in an oven (90°C) to obtain the corresponding material.

[0057] Comparative Example 3: Prepare 10.0 kg of sodium silicate with a mass concentration of 20% (modulus 3.3). Soak a honeycomb glass fiber substrate in the sodium silicate slurry for 1 hour while stirring. Then remove the substrate loaded with sodium silicate and dry it in an oven (90°C).

[0058] Prepare 5.0 kg of 15% dilute sulfuric acid. Then, place the dried sample into the dilute sulfuric acid and react at 65°C for 3 hours. After the reaction is complete, remove the sample and rinse it with water until the pH of the washing solution reaches 6.

[0059] Prepare 10.0 kg of dilute ammonia solution with a mass fraction of 6%. Then, place the washed sample into the dilute ammonia solution and age it at 40°C for 6 hours. After aging, wash it again with clean water until the washing solution is neutral. Finally, dry the sample in an oven (105°C) to obtain the corresponding material.

[0060] Comparative Example 4: Collect several pieces of wheel core material from a commercially available spool that had been rendered unusable due to cracking. Remove the painted parts from the surface and cut them into pieces approximately 5cm in size. 3 After the blocks of various sizes are placed into a horizontal ball mill, they are ground using the dry ball milling method. After grinding, 2.0 kg of 300-mesh powder is sieved and collected for later use.

[0061] Prepare 10.0 kg of sodium silicate with a mass concentration of 20% (modulus 3.3). Add 2.0 kg of prepared powder to it while stirring continuously, and then continue stirring for 2 hours to evenly disperse it in the silicate to obtain the powder / silica mixture slurry.

[0062] The honeycomb-shaped glass fiber substrate was immersed in the obtained powder / water glass mixture for 1 hour while stirring. Then the substrate loaded with the mixture was removed and placed in an oven (90°C) to dry.

[0063] Prepare 5.0 kg of 15% dilute sulfuric acid, then place the dried sample into the dilute sulfuric acid and react at 65°C for 3 hours. After the reaction is complete, remove the sample and rinse it with water until the washing solution is neutral. Finally, place the sample in an oven (105°C) to dry it to obtain the corresponding material.

[0064] Performance testing: Take samples from Examples 1-4 and Comparative Examples 1-4, and cut them into 100mm pieces. 3 The test block was tested at a temperature of 15℃ and a relative humidity of 85% (the ambient temperature and humidity were maintained stable using a humidifier and air conditioner during the test; the test method for the material's adsorption performance is as follows). Figure 1 As shown in the figure, the dehumidification performance was tested under the condition of a face wind speed of 1.5 m / s. The test method is as follows: 1. Place the sample in the desorption device and desorb until it no longer loses weight, then record its mass; 2. Place the completely desorbed sample into a test chamber with a volume equivalent to the sample volume (ensuring no air leakage in the chamber after sample placement), and proceed according to... Figure 1 The method shown was used to adsorb for 7.5 min under the above conditions, and then its mass was recorded, and temperature and humidity data at the front and back ends of the test equipment were collected. 3. Place the adsorbed sample into the desorption device for 2.5 min and record its mass (because the area ratio of the adsorption / desorption zone is mostly 3:1 when the rotor is actually running, the adsorption / desorption time ratio used in the test is 3:1). 4. Calculate the weight gain (Δm) of the sample after adsorption. 吸附 ), weight loss after desorption (△m) 脱附 ) and the desorption rate during desorption [(△m 脱附 / △m 吸附 [100%] and compare; 5. Calculate the absolute moisture content using the temperature and humidity data at the front and rear ends of the sample during adsorption, then plot the dehumidification curve of the sample during the test and compare it (dehumidification = absolute moisture content at the front end of the sample - absolute moisture content at the rear end of the sample).

[0065] The adsorption / desorption data of the above samples are shown in Table 1 below, and the dehumidification effect is as follows: Figure 2 As shown in Table 1, the data shows that the better-performing examples have adsorption capacities that reach or even exceed those of Comparative Example 1 (the commercially available rotor core material used in Example 1), resulting in a slight decrease in desorption efficiency. Of course, there are also examples where the adsorption efficiency decreases, but the desorption efficiency actually increases. In practical applications, the formula can be adjusted according to requirements. For example, in places with low humidity control requirements, such as bridges, Example 2, with a lower adsorption capacity but better desorption efficiency, can be used to reduce the desorption temperature and achieve energy savings. In fields such as food processing, where humidity control requirements are slightly higher, Example 1, with a higher adsorption capacity and a slightly lower desorption efficiency than Comparative Example 1, can be used to achieve higher dehumidification requirements.

[0066] Table 1 Adsorption / Desorption Data for Each Sample A comparison of Example 1 and Comparative Example 2 shows that when silica sol is simply used as an adhesive, its adsorption capacity is far lower than that of the method used in this invention. A comparison with Comparative Example 3 demonstrates that even without adding powder, using only the water glass formulation of this invention will result in a significant difference in dehumidification performance. A comparison with Comparative Example 4 clarifies the necessity of ammonia aging (both adsorption capacity and desorption efficiency can be improved).

[0067] In summary, by using the method of the present invention, the core material of waste silica gel dehumidifying wheel and the cutting waste during the production of silica gel wheel can be effectively recycled and reused. After recycling, its dehumidification effect is similar to that of the core material of normal wheel, so that the recycled material reaches or approaches the performance before being scrapped. Furthermore, the formula can be adjusted to meet different needs to achieve different purposes, which has the advantages of flexible formula and easy adjustment.

[0068] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

[0069] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

Claims

1. A method for preparing dehumidifying materials using a rotary wheel to recycle waste, characterized in that, The method includes: Water glass is used as an adhesive. Powdered silica gel wheel waste is added to the water glass while continuously stirring and mixed to obtain a mixed slurry. The water glass is an aqueous solution of silicate as shown in formula (I), R2O·nSiO2 (I), where R is an alkali metal and n is the modulus of silicate. The substrate is coated or impregnated with the mixed slurry and dried to obtain a dehumidifying material precursor. The dehumidifying material precursor is placed in an acid solution and reacted at a temperature of 30-80℃. After the reaction, it is rinsed until the pH value of the wash solution is 5.5-6.

5. Then, it is placed in ammonia water and aged at a temperature of 20-60℃. After aging, it is rinsed until the wash solution is neutral and dried to obtain the dehumidifying material.

2. The method for preparing dehumidifying materials using a rotary wheel to recover waste materials according to claim 1, characterized in that, The particle size of the silicone roller waste powder is 100-300 mesh; and / or, before the preparation of the mixed slurry, the silicone roller waste is de-painted and cut into blocks, and then dry ball-milled in a ball mill to obtain silicone roller waste powder of the desired particle size.

3. The method for preparing dehumidifying materials using a rotary wheel to recover waste materials according to claim 1, characterized in that, When the dehumidifying material precursor is obtained, the drying is carried out in an oven; and / or, the substrate is a honeycomb glass fiber substrate.

4. The method for preparing dehumidifying materials using a rotary wheel to recover waste materials according to claim 1, characterized in that, n is 2.2-3.5; and / or, the mass percentage of silicate in the water glass is 3%-20%.

5. The method for preparing dehumidifying materials using a rotary wheel to recover waste materials according to claim 1, characterized in that, The silicate content in the water glass is 5%-15% by mass; and / or, by mass percentage, the amount of powder added accounts for 1%-30% of the water glass.

6. The method for preparing dehumidifying materials using a rotary wheel to recover waste materials according to claim 1, characterized in that, The amount of powder added accounts for 10%-30% of the water glass by mass percentage; and / or, R is sodium; and / or, the mass ratio of the powder to the silicate in the water glass is 1:0.5-2.

5.

7. The method for preparing dehumidifying materials using a rotary wheel to recover waste materials according to claim 1, characterized in that, The mass ratio of the powder to the silicate in the water glass is 1:0.5-2.0; and / or, when the mixed slurry is used to treat the substrate by impregnation, the impregnation time is 0.5-3 hours, and the mixture is stirred during the impregnation process.

8. The method for preparing dehumidifying materials using a rotary wheel to recover waste materials according to claim 1, characterized in that, The mass ratio of the powder to the silicate in the water glass is 1:0.55-1.85; and / or, when obtaining the dehumidifying material precursor, the drying is carried out at 60-120°C.

9. The method for preparing dehumidifying materials using a rotary wheel to recover waste materials according to claim 1, characterized in that, The reaction time after adding acid is 1-8 hours; and / or the aging time is 2-36 hours; and / or the acid is an aqueous sulfuric acid solution with a mass concentration of 5%-25%; and / or the ammonia water used for aging has a mass concentration of 2%-10%.

10. A method for preparing a dehumidifying impeller, characterized in that, The method for preparing the dehumidifying impeller includes the method for preparing dehumidifying materials by recycling waste materials using an impeller as described in any one of claims 1-9.

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