CN120004267A - A high-medium-pore and high-porosity activated carbon for wastewater and waste gas and a preparation method thereof - Google Patents
A high-medium-pore and high-porosity activated carbon for wastewater and waste gas and a preparation method thereof Download PDFInfo
- Publication number
- CN120004267A CN120004267A CN202510229719.0A CN202510229719A CN120004267A CN 120004267 A CN120004267 A CN 120004267A CN 202510229719 A CN202510229719 A CN 202510229719A CN 120004267 A CN120004267 A CN 120004267A
- Authority
- CN
- China
- Prior art keywords
- carbonization
- activated carbon
- specific surface
- surface area
- wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/336—Preparation characterised by gaseous activating agents
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Carbon And Carbon Compounds (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The application provides a high-mesopore large-porosity active carbon for waste water and gas, which comprises the following steps of primary carbonization at low temperature, asphalt stirring and grinding, sieving, kneading by adding an adhesive, extrusion molding, drying, secondary carbonization, sieving, high-temperature activation and sieving, wherein the specific surface area of mesopores is 200-350m 2/g, the specific surface area of macropores is 8-15%, and the specific surface area of macropores is 50-100m 2/g, and the specific surface area of macropores is 4-8%. The ratio of the mesopores to the macropores in the total specific surface area is respectively improved, the continuity is strong, the yield is high, no waste products are generated, the materials and the energy sources are saved, no chemical process is performed, no environmental pollution is caused, the developed mesopores and macropores are provided, larger molecules can be adsorbed, the filtering speed is high, and the method is a better choice for the waste water and waste gas industry.
Description
Technical Field
The invention belongs to the technical field of preparation of activated carbon adsorption materials, and particularly relates to high-mesopore large-porosity activated carbon for waste water and waste gas and a preparation method thereof.
Background
The ratio of micropores, mesopores and macropores in the activated carbon is respectively that the micropores are smaller than 2nm in radius, the volume of the micropores is generally above 0.20-0.60cm 3/g, the micropores account for about more than 95% of the total specific surface area of the activated carbon, even more than 1500m 2/g, the mesopores are between 2 and 50nm in radius, the volume of the mesopores is generally 0.2-0.8cm 3/g, the specific surface area is 200-450m 2/g, the mesopores account for relatively less, and generally no more than 5% of the total specific surface area of the activated carbon, the macropores are larger than 50nm in radius, the volume of the macropores is generally 0.2-0.8cm 3/g, the specific surface area is minimum, the macropores are generally between 0.5-100m 2/g, and the macropores account for relatively less, and generally no more than 1% of the total specific surface area of the activated carbon. The application of the porous membrane has the application scenes of different pore diameters, namely micropores which have extremely strong adsorption capacity to small molecular substances such as hydrogen, carbon dioxide, methane and the like due to extremely small pore diameters and huge specific surface areas, are commonly used in the fields of gas storage, indoor air purification, supercapacitor electrode materials and the like, mesopores which mainly play a role of a transportation channel and help adsorbate molecules to diffuse into the micropores, are commonly used for adsorbing macromolecular substances or serving as a catalyst carrier, such as adsorbing dye molecules in textile printing and dyeing wastewater treatment, macropores which are used for adsorbing macromolecular substances or providing a rapid adsorption channel, and macropores which can allow macromolecular organic substances to rapidly enter the interior in water treatment and then adsorb through the mesopores and the micropores.
At present, the produced activated carbon contains micropores, mesopores and macropores, the proportion is unstable, particularly the activated carbon used in the industries of waste water and waste gas, the use adsorption rate of the activated carbon per unit mass is only about 15%, and the used activated carbon can only be treated as dangerous waste or solid waste, thereby greatly wasting resources. At present, the conventional activated carbon has the advantages of high purchase cost, low use adsorption rate, frequent replacement of activated carbon products, incapability of on-line regeneration, serious resource waste and easy environmental pollution.
At present, the total specific surface area of the conventional activated carbon is about 5% of the total mesopores and macropores in the conventional activated carbon, and the conventional activated carbon is wasted when being used in waste water and waste gas.
Disclosure of Invention
The invention aims to provide the high-mesopore large-porosity activated carbon for wastewater and waste gas and the preparation method thereof, and the product can be used in the fields of wastewater adsorption and waste gas adsorption, so that the problems of low adsorption rate, short product replacement period and incapability of online regeneration of the activated carbon are solved.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the active carbon with high mesopore and macroporosity for waste water and gas is characterized in that the radius of mesopores is between 2 and 50nm, the specific surface area of the mesopores is 200-350m 2/g, and the ratio of the mesopores in the total specific surface area of the active carbon is 8-15%;
The radius of the macropores is larger than 50nm, the specific surface area of the macropores is 50-100m 2/g, and the ratio of the macropores in the total specific surface area of the activated carbon is 4-8%;
The radius of the micropore is less than 2nm, the specific surface area of the micropore is 1000-1500m 2/g, and the proportion of the micropore in the total specific surface area of the activated carbon is the rest.
The preparation method of the high-mesopore large-porosity active carbon for wastewater and waste gas comprises the following steps in sequence:
1) Firstly, conveying raw materials into an internal heating carbonization furnace for low-temperature primary carbonization, and indirectly cooling water after carbonization discharge to obtain primary carbonized materials;
2) Uniformly stirring and mixing the primary carbonized material and asphalt in a stirring tank, conveying the mixture into a pulverizer to pulverize the mixture into 200 meshes, and sieving the mixture with a 200-mesh sieve to obtain carbonized material undersize;
3) Adding the carbonized material undersize into a kneader, adding an adhesive, and mixing to obtain a kneaded material;
4) Conveying the kneaded material into a press machine for extrusion molding;
5) Then the molding material falls onto a steel belt dryer for drying, and a drying material is obtained after continuous drying is completed;
6) Conveying the dried material into an external heating carbonization furnace for secondary carbonization;
7) Screening after secondary carbonization and cooling, returning the screen discharging material to the kneading process, wherein the screen upper material is the secondary carbonized material;
8) Conveying the secondary carbonized material into an external heating type activation furnace for high-temperature activation;
9) And then sieving the activated material, wherein the oversize material is columnar activated carbon, and grinding the undersize material to obtain powdery activated carbon.
Preferably, in step 1), the raw material is at least one of fruit shell, coconut shell and palm shell.
Preferably, the primary carbonization temperature is 630-670 ℃, the primary carbonization time is 0.3-1 hour, the oxygen concentration in the rotary carbonization furnace is less than 5% by volume, the rotary carbonization furnace runs under micro negative pressure, and the negative pressure is controlled between-50 Pa and-100 Pa.
Preferably, the granularity of the asphalt is 80-90 meshes, and the mass of the primary carbonized material is 20-25, wherein the mass of the asphalt is 75-80.
Preferably, the addition mass of the adhesive accounts for 8-10% of the mass of the carbonized material under-screen;
the preparation method of the adhesive is a mixture of 100wt% of pregelatinized starch and 8wt% of polyacrylamide with 1000 ten thousand molecular weight;
kneading is mixing into a paste.
Preferably, the extrusion molding is cylindrical, and the diameter is 3mm-6mm.
Preferably, the drying condition is 110-130 ℃, the drying time is 1-2 hours, and the water content is 4-6wt%.
Preferably, the temperature of the secondary carbonization is 600-650 ℃, the time of the secondary carbonization is 0.4-0.5 hours, the oxygen concentration in the rotary carbonization furnace is less than 5%, the rotary carbonization furnace runs under micro negative pressure, and the negative pressure is controlled between-50 Pa and-100 Pa.
Preferably, the activation temperature is 800-900 ℃, the activation time is 30-60 min, and the activation is carried out by adopting water vapor as an activating agent.
The application has the following beneficial technical effects:
In the application, the ratio of the medium pore to the large pore in the activated carbon in the total specific surface area is respectively improved, and the activated carbon is used in the waste water and waste gas industry, so that the use adsorption rate of the activated carbon is increased, the replacement times of the activated carbon are reduced, and natural resources are saved on the premise of meeting the use conditions.
The preparation method has the advantages of high continuity, adoption of advanced devices and equipment from raw materials, high yield, selection of an internal heating carbonization furnace by primary carbonization, selection of an external heating carbonization furnace by secondary carbonization, selection of an external heating activation furnace by activation, and high yield, and no waste products, wherein secondary carbonization screen blanking and activation screen blanking are reasonably utilized, secondary carbonization screen blanking is repeatedly kneaded, and activation screen blanking is ground into another applied product, and the preparation method is material-saving, energy-saving, advanced, high in continuity and energy-saving, and has no chemical process, and the preparation of the carbon has certain environmental pollution, the application range of the prepared active carbon is limited, and the preparation method is free of chemicals and environmental pollution.
In the application, the active carbon is mainly characterized in that the active carbon has developed mesopores and macropores although the active carbon has only medium specific surface area, can adsorb larger molecules, has high filtration speed, and is a better choice for the waste water and waste gas industry.
Drawings
Fig. 1 is a schematic process flow diagram of a preparation method of high-mesopore large-porosity activated carbon for wastewater and exhaust gas according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in figure 1, the application provides the high-mesopore large-porosity active carbon for wastewater and waste gas, wherein the radius of mesopores is between 2 and 50nm, the specific surface area of the mesopores is 200-350m 2/g, and the ratio of the mesopores in the total specific surface area of the active carbon is 8-15%;
The radius of the macropores is more than 50nm and less than or equal to 150nm, the specific surface area of the macropores is 50-100m 2/g, and the ratio of the macropores in the total specific surface area of the activated carbon is 4-8%;
the radius of the micropores is less than 2nm and more than or equal to 0.01nm, the specific surface area of the micropores is 1000-1500m 2/g, the proportion of the micropores in the total specific surface area of the activated carbon is 100 percent minus the proportion of the medium Kong Zhanbi and the remainder after the proportion of the macropores.
The application provides a preparation method of high-mesopore large-porosity active carbon for waste water and waste gas, which comprises the following steps in sequence:
1) Firstly, conveying raw materials into an internal heating carbonization furnace for low-temperature primary carbonization, and indirectly cooling water after carbonization discharge to obtain primary carbonized materials;
2) Uniformly stirring and mixing the primary carbonized material and asphalt in a stirring tank, conveying the mixture into a pulverizer to pulverize the mixture into 200 meshes, and sieving the mixture with a 200-mesh sieve to obtain carbonized material undersize;
3) Adding the carbonized material undersize into a kneader, adding an adhesive, and mixing to obtain a kneaded material;
4) Conveying the kneaded material into a press machine for extrusion molding;
5) Then the molding material falls onto a steel belt dryer for drying, and a drying material is obtained after continuous drying is completed;
6) Conveying the dried material into an external heating carbonization furnace for secondary carbonization;
7) Screening after secondary carbonization and cooling, returning the screen discharging material to the kneading process, wherein the screen upper material is the secondary carbonized material;
8) Conveying the secondary carbonized material into an external heating type activation furnace for high-temperature activation;
9) And then sieving the activated material, wherein the oversize material is columnar activated carbon, and grinding the undersize material to obtain powdery activated carbon.
In one embodiment of the present application, in step 1), the raw material is at least one of fruit shell, coconut shell and palm shell.
In one embodiment of the application, the primary carbonization temperature is 630-670 ℃, the primary carbonization time is 0.3-1 hour, the oxygen concentration in the rotary carbonization furnace is less than 5%, the rotary carbonization furnace runs under micro negative pressure, and the negative pressure is controlled between-50 Pa and-100 Pa.
In one embodiment of the application, the granularity of the asphalt is 80-90 meshes, and the mass of the primary carbonized material is that of the asphalt= (75-80): (20-25).
In one embodiment of the application, the addition mass of the adhesive accounts for 8-10% of the mass of the carbonized material under-screen;
the preparation method of the adhesive is a mixture of 100wt% of pregelatinized starch and 8wt% of polyacrylamide with 1000 ten thousand molecular weight;
kneading is mixing into a paste.
In one embodiment of the application, the extrusion is cylindrical with a diameter of 3mm-6mm.
In one embodiment of the present application, the drying conditions are 110-130 ℃ and the drying time is 1-2 hours, and the drying is performed to a water content of 4-6 wt%.
In one embodiment of the application, the temperature of the secondary carbonization is 600-650 ℃, the time of the secondary carbonization is 0.4-0.5 hours, the oxygen concentration in the rotary carbonization furnace is less than 5%, the micro negative pressure in the rotary carbonization furnace operates, and the negative pressure is controlled between-50 Pa and-100 Pa.
In one embodiment of the application, the activation temperature is 800-900 ℃ and the activation time is 30-60 min, and steam is used as the activator.
The reason why the proportion of the mesopores in the total specific surface area of the activated carbon is improved to 8% -15% from not exceeding 5% originally and the reason why the proportion of the macropores in the total specific surface area is improved to 4% -8% from not exceeding 1% originally:
Oxygen-containing gas such as water vapor, flue gas (the main component is CO 2) or mixed gas thereof is adopted as an activating agent, and is contacted with carbon at high temperature to generate oxidation-reduction reaction for activation, so that carbon monoxide, carbon dioxide, hydrogen and other hydrocarbon gases are generated, the purpose of pore forming in carbon particles is achieved through gasification reaction (burning loss) of the carbon, the principle of pore forming is also adopted, and the main chemical reaction formula is as follows:
C+2H2O＝2H2+CO2;
C+H2O＝H2+CO;
CO2+C=2CO;
The three chemical reactions are all endothermic reactions, namely, the temperature of an activation reaction area of an activation furnace gradually decreases along with the progress of the activation reaction, if the temperature of the activation area is lower than 800 ℃, the activation reaction cannot be normally performed, so that partial air and gas generated by activation need to be simultaneously introduced into the activation reaction area of the activation furnace to burn and supplement heat, or an external heat source is supplemented, so that the activation temperature of the activation reaction area of the activation furnace is ensured;
The activation reaction belongs to a plurality of reactions of a gas-solid phase system, wherein the activation process comprises two physical and chemical processes, the whole process comprises diffusion of an activating agent in a gas phase to the outer surface of a carbonized material, diffusion of the activating agent to the inner surface of the carbonized material, adsorption of the activating agent by the inner surface and the outer surface of the carbonized material, reaction of the surface of the carbonized material to generate an intermediate product (surface complex), decomposition of the intermediate product into a reaction product, desorption of the reaction product, diffusion of the desorbed reaction product from the inner surface of the carbonized material to the outer surface, and the like;
the activation reaction finally achieves the purpose of activating and pore-forming through the following three stages:
1. the pores formed during carbonization but blocked by disordered carbon atoms and hetero atoms are opened, namely, at high temperature, the activated gas reacts with disordered carbon atoms and hetero atoms firstly;
2. The open pores are continuously enlarged, penetrated and developed to depth, and carbon atoms at the edges of the pores are easy to react with the activated gas due to unsaturated structures, so that the pores are continuously enlarged and developed to depth;
3. formation of new pores as the activation reaction proceeds, new unsaturated carbon atoms or active sites are exposed to the surface of the char material, and these new active sites can then react with other molecules of the activating gas, and this uneven burning of the char material surface continuously results in the formation of new pores.
The reason and the working principle of the asphalt are that:
Providing a carbon source, namely forming a basic skeleton of the activated carbon after high-temperature carbonization of carbon elements in the asphalt, and providing a solid foundation for the subsequent activation process, wherein the skeleton structure not only ensures the stability and mechanical strength of the activated carbon, but also provides rich adsorption sites for the activated carbon, so that the activated carbon can efficiently adsorb various harmful substances;
The adhesive has the advantages that asphalt plays a role of the adhesive in the preparation process of the activated carbon, certain components in the asphalt can form an adhesive bridge at high temperature, activated carbon particles are adhered together to form a block-shaped or particle-shaped product with certain mechanical strength, and the adhesive effect not only improves the formability of the activated carbon, but also enhances the durability and stability of the activated carbon in practical application;
pore-forming and pore-structure adjusting, wherein gas and tar generated by asphalt in the pyrolysis process can form new pores, so that the specific surface area of the activated carbon is increased, the pore structure and distribution of the activated carbon can be finely adjusted by controlling the addition amount of the asphalt and the pyrolysis condition, and the adsorption performance and the catalytic performance of the activated carbon are optimized;
The asphalt can form a firm bonding bridge at high temperature, so that the bonding between the active carbon particles is tighter, the compression resistance and the abrasion resistance of the asphalt are improved, in addition, certain components in the asphalt have higher thermal stability, the basic physical and chemical properties of the asphalt can be maintained within a certain temperature range, and the service life of the active carbon is prolonged.
The primary carbonization and the secondary carbonization are carried out in the application:
the purpose of primary carbonization is to pyrolyze out non-carbon components and impurities (such as moisture and impurities) in the raw materials to obtain carbonized materials with higher carbon content, wherein the raw materials comprise shells, coconut shells and the like;
The purpose of secondary carbonization is that after primary carbonization, a product is added with a plurality of other auxiliary materials, such as asphalt and the like, which are required to be carbonized in the granulating process;
The difference between the two carbonization is that the primary carbonization is aimed at raw materials and the secondary carbonization is aimed at auxiliary materials.
In the application, kneading is mixing, which is to uniformly mix the raw materials and the auxiliary materials.
In the application, the extrusion molding is to increase the strength of the molded active carbon, and the normal extrusion pressure is kept at 200-240kg/cm 2.
In the application, the drying is to timely dry out the moisture, so that the formed activated carbon has enough strength.
In the application, the activation is that the water vapor reacts with the carbonized material at high temperature to generate gases such as hydrogen, carbon monoxide and the like, and the escape of the gases promotes the expansion and communication of pores in the carbonized material to form rich macroporous and mesoporous structures.
The method and the device which are not described in detail in the invention are all the prior art and are not described in detail.
The present invention will be further specifically illustrated by the following examples, which are not to be construed as limiting the invention, but rather as falling within the scope of the present invention, for some non-essential modifications and adaptations of the invention that are apparent to those skilled in the art based on the foregoing disclosure.
Example 1
The high-mesopore large-porosity active carbon for wastewater and waste gas of the embodiment 1, wherein the radius of mesopores is between 2 and 50nm, the specific surface area of the mesopores is 205m2, and the ratio of the mesopores in the total specific surface area of the active carbon is 11.75 percent;
The radius of the macropores is larger than 50nm, the specific surface area of the macropores is 90m 2/g, and the ratio of the macropores in the total specific surface area of the activated carbon is 5.16%;
The radius of the micropores is smaller than 2nm, the specific surface area of the micropores is 1450m 2/g, and the proportion of the micropores in the total specific surface area of the activated carbon is the balance.
The preparation method of the high-mesopore large-porosity active carbon for wastewater and waste gas in the embodiment 1 comprises the following steps in sequence:
1) Firstly, conveying raw materials into an internal heating carbonization furnace for low-temperature primary carbonization, and indirectly cooling water after carbonization discharge to obtain primary carbonized materials;
2) Uniformly stirring and mixing the primary carbonized material and asphalt in a stirring tank, conveying the mixture into a pulverizer to pulverize the mixture into 200 meshes, and sieving the mixture with a 200-mesh sieve to obtain carbonized material undersize;
3) Adding the carbonized material undersize into a kneader, adding an adhesive, and mixing to obtain a kneaded material;
4) Conveying the kneaded material into a press machine for extrusion molding;
5) Then the molding material falls onto a steel belt dryer for drying, and a drying material is obtained after continuous drying is completed;
6) Conveying the dried material into an external heating carbonization furnace for secondary carbonization;
7) Screening after secondary carbonization and cooling, returning the screen discharging material to the kneading process, wherein the screen upper material is the secondary carbonized material;
8) Conveying the secondary carbonized material into an external heating type activation furnace for high-temperature activation;
9) Then the activated material is sieved, the oversize material is columnar activated carbon, and the undersize material is milled to obtain powdery activated carbon;
in the step 1), the raw material is at least one of fruit shells, coconut shells and palm shells;
The primary carbonization temperature is 650 ℃, the primary carbonization time is 0.4 hour, the oxygen concentration in the rotary carbonization furnace is less than 5%, the rotary carbonization furnace runs under micro negative pressure, and the negative pressure is controlled between-50 Pa and-80 Pa;
The granularity of the asphalt is 80 meshes, and the mass of the primary carbonized material is equal to the mass of the asphalt=78:22;
the added mass of the adhesive accounts for 9% of the mass of the carbonized material under-screen;
the preparation method of the adhesive is a mixture of 100wt% of pregelatinized starch and 8wt% of polyacrylamide with 1000 ten thousand molecular weight;
Kneading is mixing into paste;
The extrusion molding is cylindrical, and the diameter is 4mm;
The drying condition is 115 ℃, the drying time is 1.5 hours, and the water content is 5wt%;
The secondary carbonization temperature is 625 ℃, the secondary carbonization time is 0.4 hour, the oxygen concentration in the rotary carbonization furnace is less than 5 percent, the rotary carbonization furnace runs under micro negative pressure, and the negative pressure is controlled between-50 Pa and-80 Pa;
the activation temperature is 835-845 ℃, the activation time is 40min, and the activation is to use water vapor as an activator.
Example 2
The high-mesopore large-porosity active carbon for wastewater and waste gas in the embodiment 2, wherein the radius of mesopores is between 2 and 50nm, the specific surface area of the mesopores is 213m 2/g, and the ratio of the mesopores in the total specific surface area of the active carbon is 11.85 percent;
The radius of the macropores is more than 50nm, the specific surface area of the macropores is 85m 2/g, and the ratio of the macropores in the total specific surface area of the activated carbon is 4.73%;
The radius of the micropores is less than 2nm, the specific surface area of the micropores is 1500m 2/g, and the proportion of the micropores in the total specific surface area of the activated carbon is the balance.
The preparation method of the high-mesopore large-porosity active carbon for wastewater and waste gas in the embodiment 2 comprises the following steps in sequence:
1) Firstly, conveying raw materials into an internal heating carbonization furnace for low-temperature primary carbonization, and indirectly cooling water after carbonization discharge to obtain primary carbonized materials;
2) Uniformly stirring and mixing the primary carbonized material and asphalt in a stirring tank, conveying the mixture into a pulverizer to pulverize the mixture into 200 meshes, and sieving the mixture with a 200-mesh sieve to obtain carbonized material undersize;
3) Adding the carbonized material undersize into a kneader, adding an adhesive, and mixing to obtain a kneaded material;
4) Conveying the kneaded material into a press machine for extrusion molding;
5) Then the molding material falls onto a steel belt dryer for drying, and a drying material is obtained after continuous drying is completed;
6) Conveying the dried material into an external heating carbonization furnace for secondary carbonization;
7) Screening after secondary carbonization and cooling, returning the screen discharging material to the kneading process, wherein the screen upper material is the secondary carbonized material;
8) Conveying the secondary carbonized material into an external heating type activation furnace for high-temperature activation;
9) Then the activated material is sieved, the oversize material is columnar activated carbon, and the undersize material is milled to obtain powdery activated carbon;
in the step 1), the raw material is at least one of fruit shells, coconut shells and palm shells;
The primary carbonization temperature is 640 ℃, the primary carbonization time is 0.5 hour, the oxygen concentration in the rotary carbonization furnace is less than 5%, the rotary carbonization furnace runs under micro negative pressure, and the negative pressure is controlled between-50 Pa and-80 Pa;
the granularity of the asphalt is 80 meshes, and the mass of the primary carbonized material is 80:20;
the added mass of the adhesive accounts for 8% of the mass of the carbonized material under-screen;
the preparation method of the adhesive is a mixture of 100wt% of pregelatinized starch and 8wt% of polyacrylamide with 1000 ten thousand molecular weight;
Kneading is mixing into paste;
The extrusion molding is cylindrical, and the diameter is 4mm;
The drying condition is 120 ℃, the drying time is 1.6 hours, and the water content is 5.6wt percent;
The secondary carbonization temperature is 630 ℃, the secondary carbonization time is 0.4 hour, the oxygen concentration in the rotary carbonization furnace is less than 5 percent, the rotary carbonization furnace runs under micro negative pressure, and the negative pressure is controlled between-50 Pa and-80 Pa;
The activation temperature is 840-850 ℃, the activation time is 45min, and the activation is to use water vapor as an activator.
Example 3
The high-mesopore large-porosity active carbon for wastewater and waste gas of the embodiment 3, wherein the radius of mesopores is between 2 and 50nm, the specific surface area of the mesopores is 225m 2/g, and the ratio of the mesopores in the total specific surface area of the active carbon is 13.08 percent;
The radius of the macropores is larger than 50nm, the specific surface area of the macropores is 95m 2/g, and the ratio of the macropores in the total specific surface area of the activated carbon is 5.52%;
The radius of the micropores is less than 2nm, the specific surface area of the micropores is 1400m 2/g, and the proportion of the micropores in the total specific surface area of the activated carbon is the balance.
The preparation method of the high-mesopore large-porosity active carbon for wastewater and waste gas in the embodiment 3 comprises the following steps in sequence:
1) Firstly, conveying raw materials into an internal heating carbonization furnace for low-temperature primary carbonization, and indirectly cooling water after carbonization discharge to obtain primary carbonized materials;
2) Uniformly stirring and mixing the primary carbonized material and asphalt in a stirring tank, conveying the mixture into a pulverizer to pulverize the mixture into 200 meshes, and sieving the mixture with a 200-mesh sieve to obtain carbonized material undersize;
3) Adding the carbonized material undersize into a kneader, adding an adhesive, and mixing to obtain a kneaded material;
4) Conveying the kneaded material into a press machine for extrusion molding;
5) Then the molding material falls onto a steel belt dryer for drying, and a drying material is obtained after continuous drying is completed;
6) Conveying the dried material into an external heating carbonization furnace for secondary carbonization;
7) Screening after secondary carbonization and cooling, returning the screen discharging material to the kneading process, wherein the screen upper material is the secondary carbonized material;
8) Conveying the secondary carbonized material into an external heating type activation furnace for high-temperature activation;
9) Then the activated material is sieved, the oversize material is columnar activated carbon, and the undersize material is milled to obtain powdery activated carbon;
in the step 1), the raw material is at least one of fruit shells, coconut shells and palm shells;
The primary carbonization temperature is 655 ℃, the primary carbonization time is 0.35 hour, the oxygen concentration in the rotary carbonization furnace is less than 5%, the rotary carbonization furnace runs under micro negative pressure, and the negative pressure is controlled between-50 Pa and-80 Pa;
the granularity of the asphalt is 80 meshes, and the mass of the primary carbonized material is 75:25;
The added mass of the adhesive accounts for 9.5 percent of the mass of the carbonized material under-screen;
the preparation method of the adhesive is a mixture of 100wt% of pregelatinized starch and 8wt% of polyacrylamide with 1000 ten thousand molecular weight;
Kneading is mixing into paste;
The extrusion molding is cylindrical, and the diameter is 4mm;
The drying condition is 118 ℃, the drying time is 1.4 hours, and the water content is 5.2wt%;
The secondary carbonization temperature is 635 ℃, the secondary carbonization time is 0.42 hour, the oxygen concentration in the rotary carbonization furnace is less than 5 percent, the rotary carbonization furnace runs under micro negative pressure, and the negative pressure is controlled between-50 Pa and-80 Pa;
The activation temperature is 840-845 ℃, the activation time is 35min, and the activation is to use water vapor as an activator.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The high-mesopore large-porosity active carbon for waste water and waste gas is characterized in that the radius of mesopores is between 2 and 50nm, the specific surface area of the mesopores is 200-350m 2/g, and the ratio of the mesopores in the total specific surface area of the active carbon is 8-15%;
The radius of the macropores is larger than 50nm, the specific surface area of the macropores is 50-100m 2/g, and the ratio of the macropores in the total specific surface area of the activated carbon is 4-8%;
The radius of the micropore is less than 2nm, the specific surface area of the micropore is 1000-1500m 2/g, and the proportion of the micropore in the total specific surface area of the activated carbon is the rest.
2. The preparation method of the high-mesopore large-porosity active carbon for wastewater and waste gas is characterized by comprising the following steps in sequence:
1) Firstly, conveying raw materials into an internal heating carbonization furnace for low-temperature primary carbonization, and indirectly cooling water after carbonization discharge to obtain primary carbonized materials;
2) Uniformly stirring and mixing the primary carbonized material and asphalt in a stirring tank, conveying the mixture into a pulverizer to pulverize the mixture into 200 meshes, and sieving the mixture with a 200-mesh sieve to obtain carbonized material undersize;
3) Adding the carbonized material undersize into a kneader, adding an adhesive, and mixing to obtain a kneaded material;
4) Conveying the kneaded material into a press machine for extrusion molding;
5) Then the molding material falls onto a steel belt dryer for drying, and a drying material is obtained after continuous drying is completed;
6) Conveying the dried material into an external heating carbonization furnace for secondary carbonization;
7) Screening after secondary carbonization and cooling, returning the screen discharging material to the kneading process, wherein the screen upper material is the secondary carbonized material;
8) Conveying the secondary carbonized material into an external heating type activation furnace for high-temperature activation;
9) And then sieving the activated material, wherein the oversize material is columnar activated carbon, and grinding the undersize material to obtain powdery activated carbon.
3. The method for producing an activated carbon with high mesopore and macroporosity for wastewater and exhaust gas according to claim 2, wherein in the step 1), the raw material is at least one of a shell, a coconut shell, and a palm shell.
4. The method for preparing the high-mesopore large-porosity active carbon for wastewater and waste gas according to claim 2, wherein the primary carbonization temperature is 630-670 ℃, the primary carbonization time is 0.3-1 hour, the oxygen concentration in the rotary carbonization furnace is less than 5% by volume, the rotary carbonization furnace is operated under micro negative pressure, and the negative pressure is controlled between-50 Pa and-100 Pa.
5. The method for preparing the high-mesopore and large-porosity active carbon for wastewater and waste gas according to claim 2, wherein the granularity of the asphalt is 80-90 meshes, and the mass of the primary carbonized material is 20-25 and the mass of the asphalt is 75-80.
6. The method for preparing the high-mesopore and large-porosity active carbon for wastewater and waste gas according to claim 2, wherein the addition mass of the binder accounts for 8-10% of the mass of the carbonized material under-screen;
the preparation method of the adhesive is a mixture of 100wt% of pregelatinized starch and 8wt% of polyacrylamide with 1000 ten thousand molecular weight;
kneading is mixing into a paste.
7. The method for preparing the activated carbon with high mesopore and macroporosity for wastewater and waste gas according to claim 2, wherein the activated carbon is cylindrical after extrusion molding, and has a diameter of 3mm to 6mm.
8. The method for preparing the activated carbon with high mesoporous and macroporous properties for wastewater and waste gas according to claim 2, wherein the drying condition is 110-130 ℃, the drying time is 1-2 hours, and the water content is 4-6wt%.
9. The method for preparing the high-mesopore large-porosity active carbon for wastewater and waste gas according to claim 2, wherein the secondary carbonization temperature is 600-650 ℃, the secondary carbonization time is 0.4-0.5 hours, the oxygen concentration in the rotary carbonization furnace is less than 5%, the rotary carbonization furnace is operated under micro negative pressure, and the negative pressure is controlled between-50 Pa and-100 Pa.
10. The method for preparing the activated carbon with high mesoporous and macroporous properties for wastewater and waste gas according to claim 2, wherein the activation temperature is 800-900 ℃, the activation time is 30-60 min, and water vapor is used as an activating agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510229719.0A CN120004267B (en) | 2025-02-28 | 2025-02-28 | Activated carbon with high medium pore size and high porosity for wastewater and waste gas and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510229719.0A CN120004267B (en) | 2025-02-28 | 2025-02-28 | Activated carbon with high medium pore size and high porosity for wastewater and waste gas and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN120004267A true CN120004267A (en) | 2025-05-16 |
| CN120004267B CN120004267B (en) | 2025-10-24 |
Family
ID=95663883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202510229719.0A Active CN120004267B (en) | 2025-02-28 | 2025-02-28 | Activated carbon with high medium pore size and high porosity for wastewater and waste gas and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN120004267B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004345921A (en) * | 2003-05-23 | 2004-12-09 | Hiroshima Univ | Mesoporous activated carbon |
| CN101143720A (en) * | 2006-09-29 | 2008-03-19 | 北京化工大学 | Active carbon micro-sphere absorption material and preparation method thereof |
| CN101668587A (en) * | 2007-03-14 | 2010-03-10 | 布卢彻有限责任公司 | Activated carbon-based high-performance adsorbents with high meso- and macroporosity |
| CN107140635A (en) * | 2017-05-26 | 2017-09-08 | 天津大学 | Macropore biological activated carbon of adjustable pore space and its preparation method and application |
-
2025
- 2025-02-28 CN CN202510229719.0A patent/CN120004267B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004345921A (en) * | 2003-05-23 | 2004-12-09 | Hiroshima Univ | Mesoporous activated carbon |
| CN101143720A (en) * | 2006-09-29 | 2008-03-19 | 北京化工大学 | Active carbon micro-sphere absorption material and preparation method thereof |
| CN101668587A (en) * | 2007-03-14 | 2010-03-10 | 布卢彻有限责任公司 | Activated carbon-based high-performance adsorbents with high meso- and macroporosity |
| CN107140635A (en) * | 2017-05-26 | 2017-09-08 | 天津大学 | Macropore biological activated carbon of adjustable pore space and its preparation method and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN120004267B (en) | 2025-10-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105480974B (en) | A kind of preparation method of high yield mesoporous activated carbon | |
| Plaza et al. | Production of microporous biochars by single-step oxidation: Effect of activation conditions on CO2 capture | |
| CN101214951B (en) | Preparation method of porous carbon material with high specific surface area and narrow pore distribution | |
| CN110342512A (en) | A kind of method of organic solid castoff nitrating hydro-thermal and activation preparation high-performance porous carbon materials | |
| CN105195093A (en) | Modified walnut shell active carbon adsorbent and preparation method thereof | |
| CN102746022A (en) | Preparation method of Al2O3 ceramic material with controllable bimodal porous structure | |
| CN105502379A (en) | Preparation method of active carbon for adsorbing and separating carbon dioxide | |
| CN108014750A (en) | A kind of preparation method of coal base desulfurization activated carbon | |
| CN116573640A (en) | A kind of activation process of catalyst carrier activated carbon | |
| CN106512944A (en) | Production method of oxidized wood active carbon for effectively adsorbing carbon dioxide | |
| CN116495733A (en) | Preparation method of high specific surface area bamboo activated carbon and bamboo activated carbon | |
| KR102220003B1 (en) | Activated carbon fiber for VOC abatement and method for manufacturing the same | |
| CN109835899A (en) | A kind of method that vapor activation prepares lignite base activated coke | |
| CN120004267B (en) | Activated carbon with high medium pore size and high porosity for wastewater and waste gas and preparation method thereof | |
| CN112142047A (en) | Method for preparing carbon molecular sieve by using biological semicoke | |
| CN106517189A (en) | Uniform ultra-microporous activated carbon for gas separation and preparation method of uniform ultra-microporous activated carbon | |
| CN110433854A (en) | A kind of composite catalyst for degrading formaldehyde at room temperature and its preparation method and application | |
| CN113198523A (en) | Preparation method of efficient flue gas desulfurization and denitrification catalyst | |
| US12102977B2 (en) | Biomass-based porous carbon composite materials and preparation thereof and application in CO2 adsorption | |
| CN118807803A (en) | A method for synthesizing a bifunctional carbon-based catalyst capable of removing VOCs from low-temperature flue gas | |
| CN114904485B (en) | Carbon-silicon composite adsorbent for separating methane and nitrogen and preparation method thereof | |
| JP3125808B2 (en) | Activated carbon honeycomb structure and manufacturing method thereof | |
| CN115849374A (en) | Method for preparing foam-like mesoporous-macroporous-grade porous carbon material with super-large pore volume by using rice hulls as raw materials | |
| CN117046463A (en) | Modified activated carbon catalyst and preparation method thereof | |
| CN118047378A (en) | Preparation method of mixed activated carbon and mixed activated carbon |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |