A recyclable composite adsorption carbon formula, a recyclable composite adsorption carbon manufacturing method, and a composite material using the recyclable composite adsorption carbon

Abstract

The present application provides a recyclable composite adsorption carbon formula, a recyclable composite adsorption carbon manufacturing method and a composite material using the recyclable composite adsorption carbon, and belongs to the technical field of air, water and soil pollution treatment. It solves the problem of how to manufacture a new type of adsorption material which can be recycled and reused on the basis of reducing cost and ensuring adsorption capacity. The recyclable composite adsorption carbon formula comprises the following raw materials: 30% of activated carbon powder with an iodine value of 1000, 25% of pure iron powder, 39% of pottery clay, 5% of adhesive and 1% of oxidizing agent. The process flow of the present application is simple, no secondary pollution is generated during the preparation process, the raw materials are cheap and easy to obtain, the equipment requirement is low, the requirements of large-scale production can be met, the product form and composition are stable, the adsorption capacity is stronger, and the heavy metals in the soil and water can be quickly adsorbed.

Description

Technical Field

[0001] This invention belongs to the field of air, water and soil pollution treatment technology, and relates to a recyclable composite adsorbent carbon formulation, and more particularly to a recyclable composite adsorbent carbon formulation, a method for producing recyclable composite adsorbent carbon, and a composite material using recyclable composite adsorbent carbon. Background Technology

[0002] Traditional adsorption materials for water and soil pollution treatment mostly consist of activated carbon and biochar. These materials themselves have no further value after use, and in some cases, the activated carbon and biochar even become hazardous waste, causing environmental pollution. Existing biochar and activated carbon cannot be recycled after use, failing to meet the goal of carbon reduction and sequestration. Furthermore, existing traditional adsorption materials have a single composition, only altering the adsorption capacity without achieving the intended purpose of carbon reduction and sequestration. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a recyclable composite adsorbent carbon formulation, a method for producing recyclable composite adsorbent carbon, and a composite material using recyclable composite adsorbent carbon. It solves the technical problem of how to manufacture novel recyclable adsorbent materials while reducing costs and ensuring adsorption capacity.

[0004] The objective of this invention can be achieved through the following technical solutions: A recyclable composite adsorbent carbon formulation is characterized by comprising the following raw materials: 30% activated carbon powder with an iodine value of 900-1300, 25% pure iron powder, 39% clay, 5% binder, and 1% oxidant.

[0005] This application uses activated carbon superimposed with iron powder as raw material, which has the following advantages: Removal of organic pollutants: The combination of iron powder and activated carbon can effectively remove organic pollutants from water, such as organic chemicals, impurities, pigments, and oils used in chemical processing. These organic substances often cause serious pollution to water use and treatment. Through the action of iron powder and activated carbon, these organic substances can be decomposed and adsorbed, thereby improving water quality.

[0006] Heavy metal removal: The combination of iron powder and activated carbon can reduce heavy metals in water (for example, ferrous oxide is reduced to ferric ions (Fe2+)), and then oxidized to iron oxide (Fe3+) by adding an oxidant, thereby achieving the effect of removing ferrous oxide.

[0007] Low cost: The combination of iron powder and activated carbon is significantly cheaper than other water purification technologies, while efficiently removing organic pollutants and ferrous oxide. Environmentally friendly: The combination of iron powder and activated carbon does not produce any harmful substances and has no impact on the environment, making it a clean and environmentally friendly water treatment method. Long-lasting: The combination of iron powder and activated carbon is easy to recycle and reuse multiple times, allowing for continuous operation and maintaining effectiveness for several years. This reduces maintenance and replacement costs and improves efficiency.

[0008] The addition of clay to the raw materials serves two purposes. First, during the initial production of composite adsorbent carbon, clay acts as a binder, ensuring that the clay and water are evenly mixed and shaped for easier and more efficient high-temperature firing to form the composite adsorbent carbon. Second, after the composite adsorbent carbon becomes saturated, the activated carbon within can be reduced and recycled by electrically heating the composite adsorbent carbon powder. At this point, the saturated activated carbon and iron powder are mixed, enhancing conductivity and significantly reducing resistivity. Ceramic powder (formed from clay after firing, and further pulverized with the composite adsorbent carbon) is added to prevent short circuits in the mixture. This allows for direct electric heating of the mixture, eliminating the need for preheating, minimizing resource waste, saving energy, and making it more environmentally friendly. This allows the composite adsorbent carbon to be recyclable while maintaining its adsorption capacity and reducing costs.

[0009] In the above-mentioned recyclable composite adsorbent carbon preparation formula, the iodine value of the activated carbon powder is preferably 1000.

[0010] In the above-mentioned recyclable composite adsorbent carbon preparation formula, the particle diameter of the activated carbon powder is selected in the range of 150 mesh to 220 mesh.

[0011] In the above-mentioned recyclable composite adsorbent carbon preparation formula, the particle diameter of the activated carbon powder is preferably 200 mesh.

[0012] In the above-mentioned recyclable composite adsorbent carbon preparation formula, the binder is one or more of starch, gelatin, or CMC.

[0013] In the above-mentioned recyclable composite adsorbent carbon preparation formula, the oxidant is one or more of nano magnesium oxide, nano magnesium hydroxide, nano zinc oxide, or nano aluminum oxide.

[0014] A method for preparing recyclable composite adsorbent carbon, comprising 30 parts of activated carbon powder with an iodine value of 1000 as the main raw material, and auxiliary materials including 25 parts of pure iron powder, 39 parts of clay, 5 parts of binder, 1 part of oxidant, and 15 parts of water, characterized in that the method includes the following steps: S1. Preparation of carbon-oxygen powder compound: Grind 30 parts of activated carbon to 200 mesh, then add 1 part of oxidant and stir evenly to obtain carbon-oxygen powder compound. S2. Preparation of iron ceramic powder: Mix 25 parts of pure iron powder with 39 parts of clay powder and stir evenly to obtain iron ceramic powder. S3. After mixing the obtained carbon oxide compound and iron ceramic powder evenly, add 5 parts of binder and mix evenly. S4. Secondary mixing: Use a mixer to continue mixing the mixture containing carbon oxides, iron ceramic powder and binder, and gradually add 15 parts of water during the mixing process until evenly mixed. S5. Extrusion molding: Place the mixture from step 4 above into a rolling mill and repeatedly extrude it for at least 15 minutes to increase its toughness. S6. Blank forming: The extruded mixture is pressed into a sheet-like composite carbon blank using a tablet press. S7. Drying: Use a special dryer to dry the composite carbon blanks until they are completely dry and ready for use. S8. High-temperature firing: Place the dried composite carbon blank into a high-temperature calcining furnace and fire for at least 8 hours. S9. Steam Cooling: Open the steam valve on the high-temperature roasting furnace to inject 120-degree saturated steam into the high-temperature roasting furnace for cooling. S10. Turn off the high-temperature roasting furnace and remove the composite adsorbent carbon product after the furnace has completely cooled down.

[0015] This composite adsorbent carbon incorporates clay during its production process, which, after firing, forms ceramic. Initially, this ceramic effectively mixes and solidifies activated carbon powder and iron powder, forming a sheet-like structure in the finished composite adsorbent carbon. This finished composite adsorbent carbon can be further processed into granules or powdered composite adsorbent carbon powder; in short, it can be segmented as needed, making it very convenient and efficient. Once the composite adsorbent carbon becomes saturated, it can be ground into powder. The ceramic powder formed during grinding effectively prevents short circuits in the saturated composite adsorbent carbon powder. Therefore, the saturated composite adsorbent carbon powder can be directly heated electrically to reduce the activated carbon, eliminating the need for preheating before electric heating. This minimizes resource waste, saves energy, and is more environmentally friendly. This allows the composite adsorbent carbon to be repeatedly recycled while maintaining its adsorption capacity and reducing costs.

[0016] In the above-mentioned method for producing recyclable composite adsorbent carbon, the temperature in the high-temperature roasting furnace in step 8 is controlled at 1000 degrees Celsius.

[0017] In the above-mentioned method for producing recyclable composite adsorbent carbon, in step 8, after firing in a high-temperature roasting furnace for 8 hours, the power is turned off, allowing the temperature inside the high-temperature roasting furnace to naturally drop to 800 degrees before proceeding to step 9.

[0018] The process of lowering the temperature to 800 degrees Celsius at natural temperature allows the raw material to be heated more evenly, resulting in a finer texture and better adsorption effect of activated carbon.

[0019] In the above-mentioned method for producing recyclable composite adsorbent carbon, in step 9, the injection of 120-degree saturated steam into the high-temperature roasting furnace lasts for at least 5 minutes.

[0020] A composite material using recyclable composite adsorbent carbon is characterized in that the composite material comprises several sheet-like composite plates, the composite plates are laid on the same plane and adjacent composite plates are spliced ​​and fixed by hardware, the composite plates include sheet-like finished composite adsorbent carbon, the finished composite adsorbent carbon is made of activated carbon powder, pure iron powder and clay, and fiber layers are fixed on both sides of the finished composite adsorbent carbon.

[0021] This application utilizes the sheet-like structure of the above-mentioned fired composite adsorbent carbon product to make it into a composite material. The composite material can also be used for decoration and other purposes. Using such a composite material can adsorb heavy metals or pollutants such as dust in the air, reducing environmental pollution. When the material is saturated with adsorption, it can also be disassembled and recycled, effectively reducing the waste of resources.

[0022] The finished composite adsorbent carbon is made of composite material by splicing hardware parts, which makes it easy to disassemble and recycle.

[0023] In the aforementioned composite material using recyclable composite adsorbent carbon, the hardware is elongated and has an I-shaped cross-section, with the edges of two adjacent composite plates being secured within the grooves of the hardware.

[0024] The composite adsorbent carbon product of this application is fixed to the hardware by snap-fit. The long edge of two adjacent composite adsorbent carbon products is snapped into the groove of the hardware, so it can be directly pulled out for disassembly, and is very convenient for installation and recycling.

[0025] In the aforementioned composite material for recyclable composite adsorbent carbon, the composite plate and the hardware are connected by screws.

[0026] Adhesive can be applied between the composite board and the hardware to further improve the fixing strength, which is also very convenient to operate.

[0027] In the above-mentioned composite material for recyclable composite adsorbent carbon, the thickness of the finished composite adsorbent carbon product is 5-30 mm.

[0028] In the above-mentioned composite material for recyclable adsorbent carbon, the fiber layer is made of glass fiber, acrylic fiber, or aramid fiber.

[0029] Compared with existing technologies, the advantages of this product are: 1. The process of this invention is simple, does not generate secondary pollution during preparation, uses inexpensive and readily available raw materials, has low equipment requirements, can meet the requirements of large-scale production, and the resulting product has stable form and composition, achieving stronger adsorption capacity. It can quickly adsorb heavy metals in soil and water, and can also be used in decoration materials and fireproof materials.

[0030] 2. The composite adsorbent carbon prepared by the method of the present invention has a stable morphology and high adsorption reactivity. It can be used for the degradation of heavy metals and organic matter in water or soil and can be produced and applied on a large scale.

[0031] 3. In the method of this invention, clay plays a role in fusing all raw materials to form a whole during the initial preparation of composite adsorbent carbon. After high-temperature calcination, it forms a sheet-like blank (clay becomes ceramic material, which becomes ceramic powder after grinding). After the composite adsorbent carbon is saturated, it can be reduced and regenerated by electric heating. During the electric heating reduction and regeneration process, the ceramic powder can prevent short circuits in the mixture. Because the saturated activated carbon and iron powder are mixed to enhance conductivity and greatly reduce resistivity, and ceramic powder is added as a substance to prevent short circuits in the mixture, the mixture can be directly heated by electric current, eliminating the need for preheating treatment before electric heating, minimizing resource waste, saving energy, and being more environmentally friendly. This allows the composite adsorbent carbon to be repeatedly recycled while reducing costs and ensuring adsorption capacity. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the manufacturing process of the composite adsorbent carbon of the present invention; Figure 2 This is a statistical chart of experimental data on the adsorption effect of the composite adsorption carbon of the present invention; Figure 3 This is a schematic diagram of the structure of the composite material of the present invention; Figure 4 This is a structural schematic diagram of the hardware component of the present invention; Figure 5 This is a schematic diagram of the structure of the composite material of the present invention.

[0033] In the diagram, 1 is the composite board; 11 is the fiber layer; 2 is the hardware; and 21 is the groove. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0035] Example 1 A recyclable composite adsorbent carbon formulation comprises the following raw materials: 30% activated carbon powder with an iodine value of 1000, 25% pure iron powder, 39% clay, 5% binder, and 1% oxidant.

[0036] This application utilizes activated carbon combined with iron powder as raw materials, offering the following advantages: Removal of organic pollutants: The combination of iron powder and activated carbon effectively removes organic pollutants from water, such as organic chemicals, impurities, pigments, and oils used in chemical processing. These organic substances often cause serious pollution to water use and treatment. Through the action of iron powder and activated carbon, these organic substances can be decomposed and adsorbed, thereby improving water quality. Removal of heavy metals: The combination of iron powder and activated carbon can reduce heavy metals in water (e.g., ferrous oxide is reduced to ferric ions (Fe2+)), and then oxidized to ferrophosphate (Fe3+) by adding an oxidant, thus achieving the effect of removing ferrous oxide. Low cost: The cost of the combination of iron powder and activated carbon is much lower than other water purification technologies, while efficiently removing organic pollutants and ferrous oxide. Environmentally friendly: The combination of iron powder and activated carbon does not produce any harmful substances and has no impact on the environment, making it a clean and environmentally friendly water treatment method. Long-lasting effect: The combination of iron powder and activated carbon can operate continuously and maintain its effectiveness for several years, reducing the cost of maintenance and equipment replacement and extending its service life. The addition of clay to the raw materials serves two purposes. First, during the initial production of composite adsorbent carbon, clay acts as a binder, ensuring that the clay and water are evenly mixed and shaped for easier and more efficient high-temperature firing to form the composite adsorbent carbon. Second, after the composite adsorbent carbon becomes saturated, the activated carbon within can be reduced and recycled by electrically heating the composite adsorbent carbon powder. At this point, the saturated activated carbon and iron powder are mixed, enhancing conductivity and significantly reducing resistivity. Ceramic powder (formed from clay after firing, and further pulverized with the composite adsorbent carbon) is added to prevent short circuits in the mixture. This allows for direct electric heating of the mixture, eliminating the need for preheating, minimizing resource waste, saving energy, and making it more environmentally friendly. This allows the composite adsorbent carbon to be recyclable while maintaining its adsorption capacity and reducing costs.

[0037] Furthermore, the particle diameter of the activated carbon powder is preferably 200 mesh.

[0038] Furthermore, the adhesive is a combination of starch and gelatin.

[0039] Furthermore, the oxidant is nano-magnesium oxide.

[0040] like Figure 1 This invention discloses a method for preparing recyclable composite adsorbent carbon. The main raw material is 30 parts of activated carbon powder with an iodine value of 1000. Auxiliary materials include 25 parts of pure iron powder, 39 parts of clay, 5 parts of binder, 1 part of oxidant, and 15 parts of water. The method includes the following steps: S1. Preparing the carbon-oxygen powder compound: Grind 30 parts of activated carbon to 200 mesh, then add 1 part of oxidant and stir evenly to obtain the carbon-oxygen powder compound; S2. Preparing the iron-clay powder: Mix 25 parts of pure iron powder with 39 parts of clay powder and stir evenly to obtain the iron-clay powder; S3. First mixing: After the obtained carbon-oxygen compound and iron-clay powder are stirred evenly, add 5 parts of binder and stir evenly; S4. Second mixing: Use a mixer to mix the three materials containing carbon-oxygen compound, iron-clay powder, and binder. S5. Continue stirring the mixture of materials and gradually add 15 parts water while stirring until evenly mixed; S6. Extrusion molding: Place the mixture from step 4 into a rolling mill and repeatedly extrude for at least 15 minutes to increase toughness; S7. Blank forming: Press the extruded mixture into a sheet-like composite carbon blank using a tablet press; S8. Drying: Dry the composite carbon blank using a special dryer until completely dry and ready for use; S9. High-temperature firing: Place the dried composite carbon blank into a high-temperature firing furnace and fire for at least 8 hours; S10. Steam cooling: Open the steam valve on the high-temperature firing furnace and inject 120-degree saturated steam into the furnace for cooling; S11. Finishing: Close the high-temperature firing furnace and remove the finished composite adsorption carbon product after the furnace has completely cooled. This composite adsorption carbon incorporates clay during the manufacturing process, which, after firing, forms porcelain. In the early stages, this allows the activated carbon powder and iron powder to mix and solidify effectively, forming a sheet-like structure of the finished composite adsorption carbon. The finished composite adsorption carbon can be further processed into granules or powdered to form composite adsorption carbon powder. In short, it can be divided as needed, which is very convenient and efficient. Once the composite adsorbent carbon becomes saturated, it can be ground into a powder. The ceramic powder formed during grinding effectively prevents short circuits in the saturated composite adsorbent carbon powder. Therefore, the saturated composite adsorbent carbon powder can be directly heated by electricity to reduce the activated carbon, eliminating the need for preheating before heating. This minimizes resource waste, saves energy, and is more environmentally friendly. As a result, this composite adsorbent carbon can be repeatedly recycled while reducing costs and ensuring adsorption capacity.

[0041] Preferably, the temperature inside the high-temperature roasting furnace in step 8 is controlled at 1000 degrees Celsius.

[0042] Preferably, in step 8, after firing in the high-temperature calcining furnace for 8 hours, the power is turned off, allowing the temperature inside the furnace to naturally drop to 800 degrees Celsius before proceeding to step 9. Allowing the temperature to drop naturally to 800 degrees Celsius results in more uniform heating of the raw material, leading to a finer texture and improved adsorption capacity of the activated carbon.

[0043] Preferably, in step 9, the duration of injecting 120°C saturated steam into the high-temperature roasting furnace is at least 5 minutes.

[0044] like Figure 2 The following are the adsorption effect test results of this composite adsorbent carbon powder: The test focused on the removal of Cr(VI) in aqueous solution: K2Cr2O7 aqueous solution was used to simulate Cr(VI)-containing wastewater, with a concentration of 20 mg / L and a solution volume of 100 ml. The reaction was carried out in a 100 ml Erlenmeyer flask at pH 3. The dosage of composite adsorbent carbon powder was 0.4 g / L. The Erlenmeyer flask was placed in a constant temperature shaker at 25°C. Solution samples were taken at 10 min, 20 min, 30 min, 50 min, 80 min, and 120 min of the reaction. After filtration through a 0.1 μm filter membrane, the Cr(VI) concentration was measured using a spectrophotometer. The experimental results are shown below. Figure 2 As shown, the composite adsorbent carbon powder reached equilibrium after 60 minutes of reaction, achieving a Cr(VI) equilibrium removal rate of 99.1%. This composite adsorbent carbon powder can be used to degrade heavy metals or organic pollutants in soil or water, exhibits good dispersibility, and improves the removal efficiency of Cr(VI) in water.

[0045] like Figures 3-5 The illustration describes a composite material using recyclable composite adsorbent carbon. This composite material comprises several sheet-like composite panels 1, laid on the same plane, with adjacent panels 1 joined and fixed together by hardware 2. Each composite panel 1 includes sheet-like finished composite adsorbent carbon, with fiber layers 11 fixed to both sides of the finished composite adsorbent carbon. This application utilizes the sheet-like structure of the aforementioned fired composite adsorbent carbon to create a composite material. This composite material can be used for decoration and other purposes. Using such a composite material, heavy metals or pollutants such as dust in the air can be adsorbed, reducing environmental pollution. When the material becomes saturated, it can be disassembled and recycled, effectively reducing resource waste. The finished composite adsorbent carbon is joined together using hardware 2 to form a panel, making disassembly and assembly convenient and facilitating recycling.

[0046] Furthermore, the hardware component 2 is elongated and has an I-shaped cross-section, with the edges of two adjacent composite plates 1 being engaged in the grooves 21 of the hardware component 2. The composite adsorbent carbon product of this application is fixedly connected to the hardware component 2, and the long edges of two adjacent composite adsorbent carbon products are engaged in the grooves 21 of the hardware component 2, making disassembly and removal as simple as pulling it out, and making installation and recycling very convenient.

[0047] Furthermore, the composite sheet 1 and the hardware 2 are connected by screws. Adhesive can also be applied between the composite sheet 1 and the hardware 2 to further enhance the fixing strength and facilitate operation.

[0048] Furthermore, the thickness of the finished composite adsorbent carbon product is 5-30mm.

[0049] Furthermore, the fiber layer 11 is made of glass fiber, acrylic fiber, or aramid fiber.

[0050] Example 2 The other structures in this embodiment are basically the same as those in Embodiment 1. The difference is that the recyclable composite adsorption carbon formula in this embodiment includes the following raw materials: 30% activated carbon powder with an iodine value of 1000, 25% pure iron powder, 39% clay, 5% binder, and 1% oxidant. The adsorption effect of the composite adsorption carbon produced is basically the same as that in Embodiment 1.

[0051] Example 3 The other structures in this embodiment are basically the same as those in Embodiment 1. The difference is that the recyclable composite adsorption carbon formula in this embodiment includes the following raw materials: 30% activated carbon powder with an iodine value of 1300, 25% pure iron powder, 39% clay, 5% binder, and 1% oxidant. The adsorption effect of the composite adsorption carbon produced is basically the same as that in Embodiment 1.

[0052] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. At the same time, the basic principles, main features, and advantages of this invention have been shown and described above, which should be understood by those skilled in the art.

Claims

1. The application of a recyclable composite adsorbent carbon in the treatment of Cr(VI)-containing wastewater, characterized in that, The recyclable composite adsorbent carbon comprises the following raw materials: 30% activated carbon powder with an iodine value of 900-1300, 25% pure iron powder, 39% clay, 5% binder, and 1% oxidant; the binder is one or more of starch, gelatin, or CMC; the oxidant is nano-magnesium oxide. The steps of the method for preparing the recyclable composite adsorbent carbon are as follows: S1. Preparation of carbon-oxygen powder compound: Grind 30 parts of activated carbon to 200 mesh, then add 1 part of oxidant and stir evenly to obtain carbon-oxygen powder compound. S2. Preparation of iron ceramic powder: Mix 25 parts of pure iron powder with 39 parts of clay powder and stir evenly to obtain iron ceramic powder. S3. After mixing the obtained carbon oxide compound and iron ceramic powder evenly, add 5 parts of binder and mix evenly. S4. Secondary mixing: Use a mixer to continue mixing the mixture containing carbon oxides, iron ceramic powder and binder, and gradually add 15 parts of water during the mixing process until evenly mixed. S5. Extrusion molding: Place the mixture from step 4 above into a rolling mill and repeatedly extrude it for at least 15 minutes to increase its toughness. S6. Blank forming: The extruded mixture is pressed into a sheet-like composite carbon blank using a tablet press. S7. Drying: Use a special dryer to dry the composite carbon blanks until they are completely dry and ready for use. S8. High-temperature firing: Place the dried composite carbon blank into a high-temperature calcining furnace and fire for at least 8 hours. S9. Steam Cooling: Open the steam valve on the high-temperature roasting furnace to inject 120°C saturated steam into the high-temperature roasting furnace for cooling. S10. Turn off the high-temperature roasting furnace and remove the composite adsorbent carbon product after the furnace has completely cooled down.

2. The application of the recyclable composite adsorbent carbon according to claim 1 in the treatment of Cr(VI)-containing wastewater, characterized in that, The activated carbon powder has an iodine value of 1000.

3. The application of the recyclable composite adsorbent carbon according to claim 1 in the treatment of Cr(VI)-containing wastewater, characterized in that, The particle diameter of the activated carbon powder is selected in the range of 150 mesh to 220 mesh.

4. The application of a recyclable composite adsorbent carbon according to claim 1 or 3 in the treatment of Cr(VI)-containing wastewater, characterized in that, The activated carbon powder has a particle diameter of 200 mesh.

5. The application of the recyclable composite adsorbent carbon according to claim 1 in the treatment of Cr(VI)-containing wastewater, characterized in that, The temperature inside the high-temperature roasting furnace in step 8 is controlled at 1000℃.

6. The application of the recyclable composite adsorbent carbon according to claim 1 in the treatment of Cr(VI)-containing wastewater, characterized in that, In step 8, after firing in the high-temperature roasting furnace for 8 hours, the power is turned off, allowing the temperature inside the high-temperature roasting furnace to drop naturally to 800°C before proceeding to step 9.

7. The application of the recyclable composite adsorbent carbon according to claim 1 in the treatment of Cr(VI)-containing wastewater, characterized in that, In step 9, the 120°C saturated steam is injected into the high-temperature roasting furnace for at least 5 minutes.

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