Preparation method of composite ceramsite with good nitrogen and phosphorus adsorption performance

Abstract

The invention relates to the technical field of environmental functional materials, and discloses a preparation method of composite ceramsite with good nitrogen and phosphorus adsorption performance, and the preparation method specifically comprises the following steps: 1, preparing raw materials: preparing fly ash, bentonite and corn straw according to a mass ratio of 6: 3: 1 as the raw materials; 2, pretreatment: crushing the raw materials to 100 meshes, and drying at 105 DEG C for 24 hours; 3, balling: mixing fly ash, bentonite and corn straw powder according to a ratio of 6: 3: 1, adding deionized water, and stirring to form a ball, so as to prepare a raw material ball with a diameter of 5-7mm; 4, drying: drying the raw material nodules in an environment at 105 DEG C for 24 hours; 5, preheating: preheating the corn straws in a muffle furnace at 400 DEG C for 40 minutes, and pyrolyzing the corn straws to form holes; the power plant waste fly ash, the natural mineral bentonite and the agricultural waste corn straw are reasonably utilized, so that the production cost is reduced, resource utilization of the wastes is realized, and environmental protection is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of environmental functional materials, and in particular to a method for preparing composite ceramsite with good nitrogen and phosphorus adsorption performance. Background Art

[0002] Eutrophication refers to water pollution caused by excessive levels of nutrients such as nitrogen and phosphorus. Essentially, it results from an imbalance in the input and output of nutrients, leading to an imbalance in the distribution of species in aquatic ecosystems. This leads to the overgrowth of a single species, disrupting the flow of matter and energy, and ultimately leading to the destruction of the entire aquatic ecosystem. Eutrophication is primarily caused by excessive levels of nitrogen and phosphorus. Fly ash, my country's largest industrial solid waste, has low added value through traditional utilization methods.

[0003] Most existing adsorption materials are in powder form, which are difficult to recycle and prone to clogging. Ceramsite has become a potential adsorption material due to its porous structure and high mechanical strength, but its preparation often relies on natural minerals and is relatively expensive. In the existing technology, ceramsite has insufficient simultaneous adsorption performance for nitrogen and phosphorus, and lacks a way to recycle it as a resource after adsorption.

[0004] To this end, we propose a preparation method for composite ceramsite with good nitrogen and phosphorus adsorption performance. Summary of the Invention

[0005] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a preparation method of composite ceramsite with good nitrogen and phosphorus adsorption performance.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme, a method for preparing composite ceramsite with good nitrogen and phosphorus adsorption performance, specifically comprising the following steps:

[0007] Step 1: Prepare raw materials: prepare fly ash, bentonite and corn straw in a mass ratio of 6:3:1 as raw materials;

[0008] Step 2: Pretreatment: crush the raw materials into 100 mesh and dry them at 105℃ for 24 hours;

[0009] Step 3: Balling: Take fly ash, bentonite and corn straw powder, mix them in a ratio of 6:3:1, add deionized water and stir to form raw balls with a diameter of 5-7 mm;

[0010] Step 4: Drying: Place the raw material balls in an environment of 105℃ and dry them for 24 hours;

[0011] Step 5: Preheating: Place the corn stalks in a muffle furnace at 400°C for 40 minutes to pyrolyze and form pores;

[0012] Step 6: Sintering: Heat to 700℃ in a muffle furnace at 10℃ / min and sinter for 10 minutes. After natural cooling, the finished ceramsite is obtained.

[0013] Preferably, the fly ash is waste from a power plant and is sifted to remove impurities to ensure the purity of the raw material.

[0014] Preferably, the bentonite is a natural mineral and is ground to 100 mesh to ensure good mixing with fly ash and corn straw.

[0015] Preferably, the corn stalks are agricultural waste, which are cleaned, dried and crushed to 100 mesh to increase their specific surface area and improve adsorption performance.

[0016] Preferably, in the third step of ball forming, the amount of deionized water added is 10% of the total mass of the raw materials to ensure that the raw balls have a certain strength and stability, while avoiding excessive moisture affecting the subsequent drying and sintering processes.

[0017] Preferably, during the fifth preheating step, the atmosphere in the muffle furnace is an air atmosphere, so as to ensure that the gas generated during the pyrolysis of the corn straw can be discharged smoothly, avoid pore blockage, and further improve the adsorption performance of the ceramsite.

[0018] Preferably, during the sixth sintering process, the atmosphere in the muffle furnace is an air atmosphere to ensure that the ceramsite can be fully oxidized during the sintering process, thereby improving the strength and adsorption performance of the ceramsite.

[0019] The present invention provides a method for preparing composite ceramsite with good nitrogen and phosphorus adsorption performance.

[0020] Beneficial effects:

[0021] 1. The preparation method of composite ceramsite with good nitrogen and phosphorus adsorption performance not only reduces production costs but also realizes resource utilization of waste by rationally utilizing fly ash from power plant waste, natural mineral bentonite and corn straw from agricultural waste, which is beneficial to environmental protection.

[0022] 2. A method for preparing a composite ceramsite with good nitrogen and phosphorus adsorption performance. The composite ceramsite prepared by this method has excellent nitrogen and phosphorus adsorption performance, can effectively remove nitrogen and phosphorus pollutants in water bodies, and is of great significance to improving the eutrophication of water bodies.

[0023] 3. A method for preparing a composite ceramsite with good nitrogen and phosphorus adsorption performance. The composite ceramsite prepared by this method has a porous structure and high mechanical strength, so that it has a long service life and good stability in practical applications, reducing replacement frequency and maintenance costs.

[0024] 4. This method for preparing composite ceramsite with good nitrogen and phosphorus adsorption performance forms a rich pore structure inside the ceramsite through specific preheating and sintering steps. These pore structures not only increase the specific surface area of ​​the ceramsite, but also increase its contact opportunities with nitrogen and phosphorus pollutants in water bodies, thereby further improving the adsorption performance of the ceramsite.

[0025] 5. The preparation method of the composite ceramsite with good nitrogen and phosphorus adsorption performance makes the pore distribution inside the ceramsite more uniform by pyrolysis of corn straw during the preheating process, which is conducive to the adsorption process.

[0026] The working principle of the present invention is that during the pelletizing step, in addition to adding an appropriate amount of deionized water to ensure the strength and stability of the raw balls, the uniformity and density of the raw balls can be further optimized by adjusting the stirring time and intensity. This helps ensure that the ceramsite maintains a consistent pore structure and adsorption properties during the subsequent drying and sintering processes. Furthermore, controlling the temperature and time during the preheating step are critical factors. A preheating temperature of 400°C and a preheating time of 40 minutes ensures sufficient pyrolysis of the corn straw, forming a rich pore structure while preventing pore clogging, providing more active sites for the subsequent adsorption process. During the sintering step, maintaining an air atmosphere not only facilitates the full oxidation of the ceramsite but also promotes chemical reactions between the raw materials at high temperatures, further enhancing the strength and adsorption properties of the ceramsite. Furthermore, an appropriate heating rate and sintering time are also crucial factors in ensuring the quality of the final product. In summary, the preparation method of the present invention, through meticulous control of the conditions in each step, successfully produces a composite ceramsite with excellent nitrogen and phosphorus adsorption properties. This ceramsite not only exhibits excellent adsorption properties, but also possesses good strength and stability, and is expected to play an important role in the water treatment industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of the inventive method of the present invention. DETAILED DESCRIPTION

[0028] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0029] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "inner," "outer," and "side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention according to specific circumstances.

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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 efforts are within the scope of protection of the present invention.

[0034] Example 1: A method for preparing a composite ceramsite with good nitrogen and phosphorus adsorption performance, such as Figure 1 As shown, the specific steps include:

[0035] Step 1: Prepare raw materials: prepare fly ash, bentonite and corn straw in a mass ratio of 6:3:1 as raw materials;

[0036] Step 2: Pretreatment: crush the raw materials into 100 mesh and dry them at 105℃ for 24 hours;

[0037] Step 3: Balling: Take fly ash, bentonite and corn straw powder, mix them in a ratio of 6:3:1, add deionized water and stir to form raw balls with a diameter of 5-7 mm;

[0038] Step 4: Drying: Place the raw material balls in an environment of 105℃ and dry them for 24 hours;

[0039] Step 5: Preheating: Place the corn stalks in a muffle furnace at 400°C for 40 minutes to pyrolyze and form pores;

[0040] Step 6: Sintering: Heat to 700℃ in a muffle furnace at 10℃ / min and sinter for 10 minutes. After natural cooling, the finished ceramsite is obtained.

[0041] Fly ash is a waste product from power plants and is screened to remove impurities to ensure the purity of the raw materials. Bentonite is a natural mineral that is ground to 100 mesh to ensure it is well mixed with fly ash and corn stalks. Corn stalks are agricultural waste that are cleaned, dried, and crushed to 100 mesh to increase their specific surface area and improve their adsorption properties. During the third step of pelletizing, the amount of deionized water added is 10% of the total mass of the raw materials to ensure that the raw balls have a certain strength and stability, while avoiding excessive moisture affecting the subsequent drying and sintering processes. During the fifth step of preheating, the atmosphere in the muffle furnace is an air atmosphere to ensure that the gases generated during the pyrolysis of corn stalks can be discharged smoothly, avoid pore blockage, and further improve the adsorption properties of the ceramsite. During the sixth step of sintering, the atmosphere in the muffle furnace is an air atmosphere to ensure that the ceramsite can be fully oxidized during the sintering process, thereby improving the strength and adsorption properties of the ceramsite. By rationally utilizing fly ash from power plant waste, natural mineral bentonite, and corn stalks from agricultural waste, not only can production costs be reduced, but waste can also be recycled as a resource, which is beneficial to environmental protection.

[0042] Example 2: Based on Example 1, Figure 1As shown, fly ash is a waste product from power plants and is screened to remove impurities to ensure the purity of the raw materials. Bentonite is a natural mineral that is ground to 100 mesh to ensure it is well mixed with fly ash and corn straw. Corn straw is an agricultural waste that is cleaned, dried, and crushed to 100 mesh to increase its specific surface area and improve its adsorption performance. During the third step of pelletizing, the amount of deionized water added is 10% of the total mass of the raw materials to ensure that the raw material balls have a certain strength and stability, while avoiding excessive moisture affecting the subsequent drying and sintering processes. During the fifth step of preheating, the atmosphere in the muffle furnace is an air atmosphere to ensure that the gases generated during the pyrolysis of corn straw can be discharged smoothly, avoid pore clogging, and further improve the adsorption performance of the ceramsite. During the sixth step of sintering, the atmosphere in the muffle furnace is an air atmosphere to ensure that the ceramsite can be fully oxidized during the sintering process, thereby improving the strength and adsorption performance of the ceramsite. The composite ceramsite prepared by this method has excellent nitrogen and phosphorus adsorption performance, can effectively remove nitrogen and phosphorus pollutants in water bodies, and is of great significance to improving the eutrophication of water bodies.

[0043] Example 3: Based on Example 1 and Example 2, Figure 1 As shown, bentonite, a natural mineral, is ground to 100 mesh to ensure good mixing with fly ash and corn straw. Corn straw, an agricultural waste, is cleaned, dried, and ground to 100 mesh to increase its specific surface area and improve adsorption performance. During the third pelletizing process, deionized water is added in an amount of 10% of the total raw material mass to ensure that the raw material balls have a certain strength and stability, while also preventing excessive moisture from affecting the subsequent drying and sintering processes. During the fifth preheating process, the atmosphere within the muffle furnace is air, ensuring that gases generated during the pyrolysis of the corn straw can be smoothly discharged, preventing pore clogging and further improving the adsorption performance of the ceramsite. During the sixth sintering process, the atmosphere within the muffle furnace is air, ensuring that the ceramsite is fully oxidized during the sintering process, thereby improving its strength and adsorption performance. The composite ceramsite prepared by this method has a porous structure and high mechanical strength, which gives it a long service life and good stability in practical applications, reducing replacement frequency and maintenance costs.

[0044] Example 4: Based on Example 1, Example 2 and Example 3, Figure 1As shown, corn stalks are agricultural waste, which are washed, dried, and crushed to 100 mesh to increase their specific surface area and improve adsorption performance. During the third step of pelletizing, the amount of deionized water added is 10% of the total mass of the raw materials to ensure that the raw balls have a certain strength and stability, while avoiding excessive moisture affecting the subsequent drying and sintering processes. During the fifth step of preheating, the atmosphere in the muffle furnace is an air atmosphere to ensure that the gas generated during the pyrolysis of corn stalks can be discharged smoothly, avoid pore blockage, and further improve the adsorption performance of the ceramsite. During the sixth step of sintering, the atmosphere in the muffle furnace is an air atmosphere to ensure that the ceramsite can be fully oxidized during the sintering process, thereby improving the strength and adsorption performance of the ceramsite. Through specific preheating and sintering steps, a rich pore structure is formed inside the ceramsite. These pore structures not only increase the specific surface area of ​​the ceramsite, but also increase its contact opportunities with nitrogen and phosphorus pollutants in the water, thereby further improving the adsorption performance of the ceramsite.

[0045] Example 5: Based on Example 1, Example 2, Example 3 and Example 4, Figure 1 As shown, during the third step of pelletizing, the amount of deionized water added is 10% of the total mass of the raw materials to ensure that the raw material balls have a certain strength and stability, while avoiding excessive moisture affecting the subsequent drying and sintering processes. During the fifth step of preheating, the atmosphere in the muffle furnace is an air atmosphere to ensure that the gas generated during the pyrolysis of corn straw can be discharged smoothly, avoid pore blockage, and further improve the adsorption performance of the ceramsite. During the sixth step of sintering, the atmosphere in the muffle furnace is an air atmosphere to ensure that the ceramsite can be fully oxidized during the sintering process, thereby improving the strength and adsorption performance of the ceramsite. Through the pyrolysis and pore formation of corn straw during the preheating process, the pore distribution inside the ceramsite is more uniform, which is conducive to the adsorption process.

[0046] Working principle of the present invention:

[0047] During the pelletizing step, in addition to adding an appropriate amount of deionized water to ensure the strength and stability of the raw balls, the uniformity and density of the raw balls can be further optimized by adjusting the stirring time and intensity. This helps ensure that the ceramsite maintains a consistent pore structure and adsorption properties during the subsequent drying and sintering processes. Furthermore, controlling the temperature and time during the preheating step is crucial. A preheating temperature of 400°C and a preheating time of 40 minutes ensures sufficient pyrolysis of the corn straw, forming a rich pore structure while preventing pore clogging, providing more active sites for the subsequent adsorption process. During the sintering step, maintaining an air atmosphere not only facilitates the full oxidation of the ceramsite but also promotes chemical reactions between the raw materials at high temperatures, further enhancing the strength and adsorption properties of the ceramsite. Furthermore, an appropriate heating rate and sintering time are also crucial factors in ensuring the quality of the final product. In summary, the preparation method of the present invention, through meticulous control of the conditions in each step, successfully produces a composite ceramsite with excellent nitrogen and phosphorus adsorption properties. This ceramsite not only exhibits excellent adsorption properties but also possesses good strength and stability, and is expected to play an important role in the water treatment industry.

[0048] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a composite ceramsite with good nitrogen and phosphorus adsorption performance, characterized in that: The specific steps include: Step 1: Prepare raw materials: prepare fly ash, bentonite and corn straw in a mass ratio of 6:3:1 as raw materials; Step 2: Pretreatment: crush the raw materials into 100 mesh and dry them at 105℃ for 24 hours; Step 3: Balling: Take fly ash, bentonite and corn straw powder, mix them in a ratio of 6:3:1, add deionized water and stir to form raw balls with a diameter of 5-7 mm; Step 4: Drying: Place the raw material balls in an environment of 105℃ and dry them for 24 hours; Step 5: Preheating: Place the corn stalks in a muffle furnace at 400°C for 40 minutes to pyrolyze and form pores; Step 6: Sintering: Heat to 700℃ in a muffle furnace at 10℃ / min and sinter for 10 minutes. After natural cooling, the finished ceramsite is obtained.

2. The method for preparing the composite ceramsite with good nitrogen and phosphorus adsorption performance according to claim 1, wherein: The fly ash is waste from power plants and is sifted to remove impurities to ensure the purity of the raw material.

3. The method for preparing the composite ceramsite with good nitrogen and phosphorus adsorption performance according to claim 1, wherein: The bentonite is a natural mineral that is ground to 100 mesh to ensure good mixing with fly ash and corn straw.

4. The method for preparing the composite ceramsite with good nitrogen and phosphorus adsorption performance according to claim 1, wherein: The corn stalks are agricultural waste, which are cleaned, dried and crushed to 100 meshes to increase their specific surface area and improve their adsorption performance.

5. The method for preparing the composite ceramsite with good nitrogen and phosphorus adsorption performance according to claim 1, characterized in that: During the third step of pelletizing, the amount of deionized water added is 10% of the total mass of the raw materials to ensure that the raw balls have a certain strength and stability, while preventing excessive moisture from affecting the subsequent drying and sintering processes.

6. The method for preparing the composite ceramsite with good nitrogen and phosphorus adsorption performance according to claim 1, characterized in that: During the fifth preheating process, the atmosphere in the muffle furnace is an air atmosphere, which ensures that the gas generated during the pyrolysis of the corn straw can be discharged smoothly, avoids pore blockage, and further improves the adsorption performance of the ceramsite.

7. The method for preparing the composite ceramsite with good nitrogen and phosphorus adsorption performance according to claim 1, characterized in that: During the sixth step of sintering, the atmosphere in the muffle furnace is an air atmosphere to ensure that the ceramsite can be fully oxidized during the sintering process, thereby improving the strength and adsorption performance of the ceramsite.

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