CN113800513A - Coal columnar activated carbon and preparation method thereof - Google Patents
Coal columnar activated carbon and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
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- C01B32/30—Active carbon
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- C01B32/336—Preparation characterised by gaseous activating agents
Abstract
The invention provides coal columnar activated carbon and a preparation method thereof. The preparation method of the coal columnar activated carbon comprises the following steps: crushing and grinding the coal powder to provide the Datong weakly caking coal and the Shandong fat coal, and crushing and grinding the coal powder into coal powder respectively; mixing and extruding for forming, namely putting the coal powder of the great same weakly caking coal and the coal powder of the Shandong fat coal into a kneading machine, adding a forming binder, stirring and mixing at room temperature, and extruding for forming to form carbon strips; carbonizing, namely putting the carbon strip into a carbonizing device for carbonizing, heating the carbon strip to 600 ℃ from room temperature and staying for 0.5-1 h to form an active carbon crude product carbon material; and (3) activating, namely putting the crude activated carbon product into an activation furnace for activation, wherein the activation temperature is 910-930 ℃, and the activated carbon product stays for 2-3 h to form coal columnar activated carbon. The raw materials selected by the invention have rich sources, and do not need to be subjected to pretreatment such as deashing and the like, and do not need to be added with additives and chemical catalysts so as not to cause corrosion and environmental pollution to preparation equipment. The preparation process has the advantages of simple route, low cost and easy large-scale production.
Description
Technical Field
The invention relates to the technical field of activated carbon production, in particular to coal columnar activated carbon and a preparation method thereof.
Background
The activated carbon has stable chemical properties, is acid-resistant and alkali-resistant, has good strength, can withstand the action of water immersion, high temperature and high pressure, can be regenerated and recycled after being used and is a carbon adsorption material with wide application. The mesopore pore canal (2 nm-50 nm) in the structure not only can adsorb some macromolecular substances, but also can be used as a bridge for connecting micropores and macropores, so that particulate matters, microorganisms, macromolecular organic matters and partial soluble substances can be changed into substances which can be removed by ultrafiltration. However, the traditional activated carbon material, especially coal-based activated carbon, has insufficient mesopores, the pore volume is difficult to reach more than 0.5mL/g, the mesopore rate is generally not more than 30%, and the activated carbon material is only suitable for adsorbing small molecular substances, so that the defect that the activated carbon directly limits the adsorption of organic macromolecules such as dyes, vitamins and the like.
In recent years, the method for preparing mesoporous activated carbon mentioned in the Chinese patent has certain disadvantages: for example, CN102040218A and CN101618871A use zinc chloride as an activator to produce mesoporous activated carbon, but the zinc chloride has certain corrosivity and volatility in the using process, and can corrode production equipment and pollute the environment; in the preparation process of CN100519412C, asphalt is subjected to thermal shrinkage reaction in a high-pressure environment of about 5MPa, so that the production equipment has more rigorous requirements; the preparation method of patent CN101717085A is to add additives such as nano ceramic powder, magnesium oxide and silicon dioxide into coal tar pitch for oxidation, use strong alkaline activators (KOH, NaOH, etc.) for activation, then use cleaning agents (ethanol, acetone, etc.) for cleaning, and finally dry to obtain the mesoporous activated carbon microspheres. It can be seen that the existing method for preparing activated carbon with developed mesopores still has the defects of expensive required raw materials, complex and long operation process, difficult application to large-scale industrial production and the like.
Disclosure of Invention
It is a primary object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a method for preparing coal-based columnar activated carbon, which does not require pretreatment such as deashing of raw materials, addition of additives and chemical catalysts, and has a simple process, low cost, and easy implementation.
Another main object of the present invention is to overcome at least one of the above drawbacks of the prior art and to provide a coal-based columnar activated carbon manufactured by the above method for manufacturing a coal-based columnar activated carbon according to the present invention.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to one aspect of the present invention, there is provided a method for producing a coal-based columnar activated carbon. The preparation method of the coal columnar activated carbon comprises the following steps:
crushing and grinding the coal powder to provide the Datong weakly caking coal and the Shandong fat coal, and crushing and grinding the coal powder into coal powder respectively;
mixing and extruding the coal powder of the great-grade weakly caking coal and the coal powder of the Shandong fat coal according to a mass ratio of 3.5: 1-4.5: 1, adding a forming binder, stirring and mixing the mixed materials at room temperature, and extruding and forming to form carbon strips;
carbonizing, namely putting the carbon strip into a carbonizing device for carbonizing, heating the carbon strip to 600 ℃ from room temperature and staying for 0.5-1 h to form an active carbon crude product carbon material; and
and (3) activating, namely putting the activated carbon crude product carbon material into an activation furnace for activation, wherein the activation temperature is 910-930 ℃, and the activated carbon crude product carbon material stays for 2-3 hours to form coal columnar activated carbon.
According to one embodiment of the present invention, the ash content of the homoeoweak coal is less than or equal to 3%. And/or the ash content of the Shandong fat coal is less than 2%.
According to one embodiment of the invention, the volatile content of the Shandong fat coal is 35% to 45%.
According to one embodiment of the invention, the fineness of the coal dust of the large and weak sticky coal is 80% of the 200-mesh passing rate. And/or the fineness of the pulverized coal of the Shandong fat coal is 80% of the passing rate of 200 meshes.
According to one embodiment of the invention, the forming binder comprises a polymeric cold binder and coal tar.
According to one embodiment of the invention, the forming binder comprises the high-molecular cold binder and the coal tar in a mass ratio of 5.5: 1-6.5: 1.
According to one embodiment of the invention, in the mixing extrusion forming step, the mass ratio of the mixture of the coal dust of the major and weakly caking coal and the coal dust of the Shandong fat coal to the forming binder is 100: 38-100: 36.
According to one embodiment of the invention, in the activation step, the activation furnace is used for activating the crude activated carbon material by a physical activation method.
According to one embodiment of the present invention, the activating agent used in the physical activation method is deionized water. And/or the amount of the activator used in the physical activation method is 1.2ml/(100 g.min).
According to another aspect of the present invention, a coal based columnar activated carbon is provided. The coal-based columnar activated carbon is produced by the method for producing a coal-based columnar activated carbon according to the present invention and described in the above embodiment.
According to the technical scheme, the coal columnar activated carbon and the preparation method thereof have the advantages and positive effects that:
the invention provides a preparation method of coal columnar activated carbon, which takes great-consistency weakly caking coal as a main material and takes Shandong fat coal as an auxiliary material. Compared with the existing preparation method, the raw materials selected by the invention have rich sources, and do not need to be subjected to pretreatment such as deashing and the like, and do not need to be added with additives and chemical catalysts so as not to cause corrosion and environmental pollution to preparation equipment. The preparation process has the advantages of simple route, low cost and easy large-scale production. Moreover, the coal columnar activated carbon prepared by the preparation method of the coal columnar activated carbon provided by the invention can be widely applied to the fields of catalyst carriers, environmental protection, food decoloration, fine chemical industry, medicine and health and the like.
Drawings
Various objects, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:
FIG. 1 is a process flow diagram illustrating a method of making coal-based columnar activated carbon in accordance with an exemplary embodiment;
FIG. 2 is a schematic nitrogen adsorption and desorption isotherm of a coal-based columnar activated carbon, according to an exemplary embodiment;
FIG. 3 is a graph illustrating quench solids function theoretical pore size distribution for a coal columnar activated carbon in accordance with an exemplary embodiment;
FIG. 4 is a graph illustrating the cumulative pore volume distribution of a coal based columnar activated carbon, according to an exemplary embodiment;
FIG. 5 is a scanning electron micrograph of a coal columnar activated carbon, shown in accordance with an exemplary embodiment.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are accordingly to be regarded as illustrative in nature and not as restrictive.
In the following description of various exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary structures, systems, and steps in which aspects of the invention may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present invention. Moreover, although the terms "over," "between," "within," and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples described in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures in order to fall within the scope of the invention.
Referring to fig. 1, a process flow diagram of a method for preparing a coal-based columnar activated carbon according to the present invention is representatively illustrated. In this exemplary embodiment, the method for producing a coal-based columnar activated carbon proposed by the present invention is described by way of example as applied to the production of a coal-based columnar activated carbon. It will be readily appreciated by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to apply the related designs of the present invention to other types of activated carbon products or other processes, and still be within the principles of the method for producing a coal-based columnar activated carbon as set forth in the present invention.
As shown in fig. 1, in the present embodiment, the method for producing a coal-based columnar activated carbon proposed by the present invention includes the steps of crushing and grinding, co-extrusion molding, carbonization, and activation. Hereinafter, each of the main steps of the method for producing a coal-based columnar activated carbon according to the present invention will be described in detail with reference to fig. 1.
As shown in fig. 1, in the present embodiment, the method for producing a coal-based columnar activated carbon according to the present invention includes the steps of:
crushing and grinding the coal powder to provide the Datong weakly caking coal and the Shandong fat coal, and crushing and grinding the coal powder into coal powder respectively;
mixing and extruding for forming, namely putting the coal powder of the great same weakly caking coal and the coal powder of the Shandong fat coal into a kneading machine, adding a forming binder, stirring and mixing at room temperature, and extruding for forming to form carbon strips;
carbonizing, namely putting the carbon strip into a carbonizing device for carbonizing, heating the carbon strip to 600 ℃ from room temperature and staying for 0.5-1 h to form an active carbon crude product carbon material; and
and (3) activating, namely putting the crude activated carbon product into an activation furnace for activation, wherein the activation temperature is 910-930 ℃, and the activated carbon product stays for 2-3 h to form coal columnar activated carbon.
Through the design, compared with the existing preparation method,the raw materials adopted by the preparation method of the coal columnar activated carbon provided by the invention have rich sources, do not need to be subjected to pretreatment such as deashing and the like, and do not need to be added with additives (such as urea, nitrate and ZnCl)2Etc.) and chemical catalysts (e.g., KOH, NaOH, etc.) without causing corrosion of the manufacturing equipment and environmental pollution. The preparation process has the advantages of simple route, low cost and easy large-scale production. Moreover, the specific surface area of the coal columnar activated carbon prepared by the preparation method of the coal columnar activated carbon provided by the invention can reach 1435m2·g-1The total pore volume is 1.01mL/g-1Iodine adsorption value of 1284mg g-1Can be widely applied to the fields of catalyst carriers, environmental protection, food decoloration, fine chemical engineering, medicine and health and the like. The preparation method of the coal columnar activated carbon provided by the invention overcomes the defects of long and complicated process, expensive raw materials, low pore size distribution uniformity, high production cost, difficulty in industrial large-scale production and the like in the traditional preparation of the mesoporous activated carbon.
Preferably, in the present embodiment, the ash content of the homoeoweak coal may be preferably less than or equal to 3%, such as 2%, 2.5%, 3%, and the like. Therefore, the coal with the same size and low viscosity generates less colloid and has better coking performance when being heated, and is the main component (main material) of the coal blending process of the preparation method of the coal columnar activated carbon provided by the invention. In other embodiments, the ash content of the high and low viscosity coal may be slightly greater than 3%, for example, 3.5%, 4%, etc., and is not limited to the present embodiment.
Preferably, in the present embodiment, the ash content of the Shandong fat coal may be preferably less than 2%, such as 0.8%, 1.2%, 1.8%, and the like. Therefore, the Shandong fat coal can generate a large amount of colloid substances when being heated, can fully bond coal dust particles together and form carbon particle substances with better mechanical strength, and is an important component (auxiliary material) of the coal blending process of the preparation method of the coal columnar activated carbon provided by the invention. In other embodiments, the ash content of the shandong fat coal may be equal to or slightly greater than 2%, for example, 2%, 2.2%, 2.5%, etc., and is not limited by the present embodiment.
In the present embodiment, the volatile content of the Shandong fat coal may preferably be 35% to 45%, for example, 35%, 40%, 45%, or the like. In other embodiments, the volatile content of the Shandong fat coal may be slightly less than 35%, or may be slightly more than 45%, such as 34%, 46%, etc., and is not limited by the present embodiment.
Preferably, in the present embodiment, the fineness of the pulverized coal of high and low viscosity coals may be preferably 80% of the 200 mesh (0.074mm) passing rate.
Preferably, in the present embodiment, the fineness of the pulverized yadendri coal may preferably be 80% of the 200-mesh (0.074mm) pass rate.
Preferably, in the present embodiment, in the co-extrusion molding step, the molding binder may preferably include a high molecular cold binder and coal tar. The viscosity of the forming binder is high, so that the material is not easy to break when the pressing strip is formed, and the function of a framework can be achieved.
Further, based on the design that the forming binder includes the high molecular cold binder and the coal tar, in the present embodiment, the mass ratio of the high molecular cold binder included in the forming binder to the coal tar may be preferably 5.5:1 to 6.5:1, for example, 5.5:1, 6:1, 6.5:1, and the like. In other embodiments, the mass ratio of the high molecular cold binder to the coal tar in the molding binder may also be slightly less than 5.5:1, or may be slightly greater than 6.5:1, such as 5:1, 7:1, and the like, and is not limited to this embodiment.
Preferably, in the present embodiment, in the co-extrusion molding step, the mass ratio of the pulverized coal of the major and weakly caking coal to the pulverized coal of the Shandong fat coal may be preferably 3.5:1 to 4.5:1, for example, 3.5:1, 4:1, 4.5:1, and the like. In other embodiments, the mass ratio of the coal dust of the same weakly caking coal to the coal dust of the Shandong fat coal may also be slightly less than 3.5:1, or may be slightly more than 4.5:1, such as 3:1, 5:1, etc., and is not limited by this embodiment.
Preferably, in the present embodiment, in the co-extrusion molding step, the mass ratio of the mixture of the pulverized coal of the major and weakly caking coal and the pulverized coal of the Shandong fat coal to the molding binder may be preferably 100:38 to 100:36, for example, 100:38, 100:37, 100:36, and the like. In other embodiments, the mass ratio of the mixture of the coal powder of the same weakly caking coal and the coal powder of the Shandong fat coal to the forming binder may also be slightly less than 100:38, or may be slightly more than 100:36, for example, 100:39, 100:40, 100:35, etc., and is not limited by this embodiment.
Preferably, in the present embodiment, in the activation step, the crude charcoal material of activated charcoal is activated by physical activation method, preferably by using an activation furnace.
Further, based on the design of activating the crude carbon material of the activated carbon by using an activation furnace and a physical activation method, in the present embodiment, the activating agent used in the physical activation method may preferably be deionized water. In other embodiments, the activator may be selected from other water such as tap water, and is not limited to this embodiment.
Further, based on the design of activating the crude activated carbon material by using an activation furnace and a physical activation method, in the present embodiment, the amount of the activating agent used in the physical activation method may preferably be 1.2ml/(100g · min), wherein "100 g" means 100g of the crude activated carbon material.
It is noted herein that the coal based columnar activated carbon and the method of making the same shown in the drawings and described in the present specification are only a few examples of the many types of methods that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any of the details or any steps of the coal based columnar activated carbon and the method of making the same as shown in the drawings or described in the specification.
Based on the above detailed description of an exemplary embodiment of the method for producing a coal-based columnar activated carbon proposed by the present invention, an exemplary embodiment of the coal-based columnar activated carbon proposed by the present invention will be described below.
In the present embodiment, the coal-based columnar activated carbon proposed by the present invention is produced by the method for producing a coal-based columnar activated carbon proposed by the present invention and described in detail in the above-described embodiments. Wherein the pore volume of the coal-based columnar activated carbon is 0.76-1.01 mL/g, and the specific surface area of the coal-based columnar activated carbon is 1236m2/g～1435m2(g) the coal columnThe mesoporosity of the activated carbon is 37.2-48.0%.
It should be noted here that the coal columnar activated carbon shown in the drawings and described in this specification is only a few examples of the many types of coal columnar activated carbon that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any of the details or any of the features of the coal based columnar activated carbon shown in the drawings or described in the specification.
In connection with the above-described exemplary description of a general embodiment of the coal-based columnar activated carbon proposed by the present invention and the method for producing the same, two specific examples that conform to the design concept of the method for producing a coal-based columnar activated carbon proposed by the present invention will be described below.
Example 1
In this embodiment, the method for preparing coal-based columnar activated carbon proposed by the present invention comprises the following steps:
respectively drying, crushing and grinding the large same weakly caking coal and the Shandong fat coal to reach the fineness of 200 meshes (0.074mm) and the passing rate of 80 percent for later use.
The cheap and easily-obtained high-molecular cold-state binder and coal tar are selected to provide cold strength for the molding material strips. Wherein the mass ratio of the cold-state binder to the coal tar is 6: 1. Weighing 1200g of coal powder according to a certain proportion (the mass ratio of the large same weakly caking coal to the Shandong fat coal is 8:2), putting the coal powder into a kneader, adding a certain amount of cold-state binder (the mass ratio of the mixed coal powder to the cold-state binder is 100:36), uniformly stirring at room temperature, extruding on a forming die through a forming machine to prepare smooth carbon strips (which are approximately cylindrical structures and have phi of 4.0mm), airing at room temperature, and cutting into materials (carbon strips) with the length of about 0.8 cm.
Weighing carbon strips with a certain mass (taking 500g as an example), putting the carbon strips into a carbonization device for carbonization, heating the carbon strips from room temperature to 600 ℃, keeping the temperature for 45min, finishing carbonization, and taking out the materials to obtain the crude activated carbon material.
And (3) introducing an activating agent into the crude activated carbon material in an activating furnace for activation, wherein the using amount of the activating agent is 1.2mL/(100 g-min), the activating temperature is 910 ℃, keeping the temperature for 2.5 hours, and taking out a material pipe of the activating furnace to prepare the coal columnar activated carbon with the loss on ignition of 70.2 percent.
Example 2
In this embodiment, the method for preparing coal-based columnar activated carbon proposed by the present invention comprises the following steps:
the other kind of large and same weakly caking coal and Shandong fat coal are respectively dried, crushed and ground into powder until the fineness is 200 meshes (0.074mm), and the passing rate is 80% for standby.
The cheap and easily-obtained high-molecular cold-state binder and coal tar are selected to provide cold strength for the molding material strips. Wherein the mass ratio of the cold-state binder to the coal tar is 6: 1. Weighing 1200g of coal powder according to a certain proportion (the mass ratio of the large same weakly caking coal to the Shandong fat coal is 8:2), putting the coal powder into a kneader, adding a certain amount of cold-state binder (the mass ratio of the mixed coal powder to the cold-state binder is 100:38), uniformly stirring at room temperature, extruding on a forming die through a forming machine to prepare smooth carbon strips (which are approximately cylindrical structures and have phi of 4.0mm), airing at room temperature, and cutting into materials (carbon strips) with the length of about 0.8 cm.
Weighing carbon strips with a certain mass (taking 500g as an example), putting the carbon strips into a carbonization device for carbonization, heating the carbon strips from room temperature to 600 ℃, keeping the temperature for 45min, finishing carbonization, and taking out the materials to obtain the crude activated carbon material.
And (3) introducing an activating agent into the crude activated carbon material in an activating furnace for activation, wherein the using amount of the activating agent is 1.2mL/(100 g-min), the activating temperature is 930 ℃, keeping the temperature for 3 hours, and taking out a material pipe of the activating furnace to obtain the coal columnar activated carbon with the loss on ignition of 76.5 percent.
In view of the above, in order to verify the beneficial effects of the coal-based columnar activated carbon and the preparation method thereof, the applicant performed the detection of the adsorption performance index and the pore size structure and the observation of the microstructure of the columnar activated carbon on the coal-based columnar activated carbon prepared by the preparation method of the coal-based columnar activated carbon. Taking the coal-based columnar activated carbon prepared in the above two embodiments as an example, the detection related to the coal-based columnar activated carbon proposed by the present invention will be described in detail with reference to fig. 2 to 5.
Detection of adsorption Performance index and pore Structure
Iodine adsorption value, subunit blue adsorption value and strength of the coal columnar activated carbon obtained in example 1 and example 2 described above were measured according to the methods in "coal granular activated carbon test methods" (GBT7702.7-2008, GBT7702.6-2008 and GBT7702.3-2008), respectively (see attached table 1). The detection result is as follows: the coal-based columnar activated carbon prepared in example 1 was examined to find that it had a specific surface area (SBET) of 1236m2(ii)/g, pore volume is 0.76 mL/g; the methylene blue adsorption value is 254 mg/g; the iodine adsorption value was 1145mg/g, the strength was 93%. The coal columnar activated carbon prepared in example 2 was examined to find that the specific surface area was 1435m2(ii)/g, pore volume 1.01 mL/g; the methylene blue adsorption value is 270 mg/g; the iodine adsorption value was 1284mg/g, the strength was 90%.
TABLE 1 attached data for the adsorption performance and pore structure of coal columnar activated carbon
The results of measuring the specific surface area and pore volume of the coal-based columnar activated carbon obtained in example 1 and example 2 were measured at a liquid nitrogen temperature using an Autosorb-1-MP type nitrogen adsorption apparatus (refer to attached table 1) of Quantachrome corporation, usa. And a nitrogen adsorption and desorption isotherm diagram of the coal columnar activated carbon prepared in example 2 as shown in fig. 2, and a Quenching Solid Density Function Theory (QSDFT) pore size distribution graph and a cumulative pore volume distribution graph as shown in fig. 3 and 4 can be obtained. As can be seen from FIG. 2, the nitrogen adsorption-desorption isotherm is a typical type (I) adsorption isotherm, and the hysteresis loop in the graph is of type H4, indicating that the resulting coal-based columnar activated carbon contains a relatively developed mesoporous structure. FIG. 3 shows that the pore size distribution of the coal-based columnar activated carbon obtained in example 2 is mainly concentrated between 0.5nm and 5nm, and the pore volume increment is concentrated in the mesopore region of less than 5 nm. In fig. 4, the pore volume of the mesopore region of less than 3.5nm is increased in terms of the cumulative pore volume, and thereafter, the amount of change in the pore volume tends to be gentle. The specific surface area of the coal columnar activated carbon is 1435m through calculation2The pore volume was 1.01mL/g and the average pore diameter was 2.82 nm.
Microstructure observation of columnar activated carbon
An appropriate amount of the coal-based columnar activated carbon obtained in example 2 was sampled and subjected to microstructure analysis using an S-3400N scanning electron microscope manufactured by Hitachi corporation: a small amount of coal columnar activated carbon sample is adhered to a sample table by conductive adhesive, the sample table is placed in an ion sputtering instrument for plating a gold membrane, and the treated sample is placed in a sample chamber for electron microscope observation. As shown in a scanning electron microscope image of figure 5, the prepared coal columnar activated carbon can be clearly observed to have a developed pore structure, the result of nitrogen adsorption isotherm analysis is further verified, and direct evidence is provided for the existence of relevant pores.
In summary, the preparation method of the coal columnar activated carbon provided by the invention takes the large and small sticky coal as the main material and the Shandong fat coal as the auxiliary material, and the preparation method comprises the steps of crushing, grinding, mixed extrusion forming, carbonization and activation, so that the coal columnar activated carbon with the ignition loss rate of 70.2-76.5% can be prepared. The specific surface area of the coal columnar active carbon prepared by the method for preparing the coal columnar active carbon can reach 1435m2The total pore volume is 1.01mL/g, the iodine adsorption value is 1284mg/g, and the catalyst can be widely applied to the fields of catalyst carriers, environmental protection, food decoloration, fine chemical engineering, medicine and health and the like.
Specifically, compared with the existing coal columnar activated carbon and the preparation method thereof, the invention at least has the following effects:
1. the active carbon pore structure is obtained by directionally changing the pore structure based on the influence of the raw material selection, carbonization and activation methods on the pore structure of the active carbon, the prepared active carbon pore structure is obviously optimized, the pore volume is 0.76-1.01 mL/g, and the methylene blue adsorption value representing the number of pores in the active carbon can reach 254-270 mg/g, so that the active carbon can effectively adsorb macromolecular organic pollutants and granular substances.
2. The preparation process flow is simple, the production cost is low, the large-scale production is easy, the prepared columnar activated carbon has higher mechanical strength and wear resistance, the requirement of the food decoloring field on higher iodine value of the activated carbon can be met, and the iodine value of the activated carbon prepared by the invention is more than 1100 mg/g.
3. The invention adopts a physical activation method without adding additives (such as urea, nitrate and ZnCl)2Etc.) and chemical activating agent (such as KOH, NaOH, etc.), the active carbon product with higher specific surface area can be prepared, the preparation cost is low, the equipment cannot be corroded, and the prepared active carbon has no problem of activating agent residue, so that the reaction of the active carbon cannot be limited.
4. The invention uses the macromolecule cold-state binder to replace most of coal tar to form the activated carbon, and can effectively solve the defects of large pollution and high preparation cost of the coal tar. In addition, compared with other binders (such as starch), the viscosity of the prefabricated forming binder is higher than that of the starch binder, so that the material is not easy to break when the material is formed into a batten and can play a role of a framework.
Exemplary embodiments of the coal based columnar activated carbon and methods for making the same as set forth in the present invention are described and/or illustrated in detail above. Embodiments of the invention are not limited to the specific embodiments described herein, but rather, components and/or steps of each embodiment may be utilized independently and separately from other components and/or steps described herein. Each component and/or step of one embodiment can also be used in combination with other components and/or steps of other embodiments. When introducing elements/components/etc. described and/or illustrated herein, the articles "a," "an," and "the" are intended to mean that there are one or more of the elements/components/etc. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.
While the proposed coal based columnar activated carbon and method for making the same have been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.
Claims (10)
1. A method for producing a coal-based columnar activated carbon, characterized by comprising the steps of:
crushing and grinding the coal powder to provide the Datong weakly caking coal and the Shandong fat coal, and crushing and grinding the coal powder into coal powder respectively;
mixing and extruding the coal powder of the great-grade weakly caking coal and the coal powder of the Shandong fat coal according to a mass ratio of 3.5: 1-4.5: 1, adding a forming binder, stirring and mixing the mixed materials at room temperature, and extruding and forming to form carbon strips;
carbonizing, namely putting the carbon strip into a carbonizing device for carbonizing, heating the carbon strip to 600 ℃ from room temperature and staying for 0.5-1 h to form an active carbon crude product carbon material; and
and (3) activating, namely putting the activated carbon crude product carbon material into an activation furnace for activation, wherein the activation temperature is 910-930 ℃, and the activated carbon crude product carbon material stays for 2-3 hours to form coal columnar activated carbon.
2. The method for producing a coal-based columnar activated carbon as claimed in claim 1, wherein ash content of said homoeotropic weakly caking coal is 3% or less; and/or the ash content of the Shandong fat coal is less than 2%.
3. The method for producing a coal-based columnar activated carbon as claimed in claim 1, wherein the volatile matter of the fatted coal in Shandong is 35 to 45%.
4. The method for producing a coal-based columnar activated carbon as claimed in claim 1, wherein the fineness of the pulverized coal of the homoeothermic coal is 80% of the passage rate of 200 mesh; and/or the fineness of the pulverized coal of the Shandong fat coal is 80% of the passing rate of 200 meshes.
5. The method of producing a coal-based columnar activated carbon as claimed in claim 1, wherein said molding binder comprises a high molecular cold binder and coal tar.
6. The method for producing a coal-based columnar activated carbon as claimed in claim 5, wherein the molding binder contains the high-molecular cold binder and the coal tar at a mass ratio of 5.5:1 to 6.5: 1.
7. The method for producing a coal-based columnar activated carbon as claimed in claim 1, wherein in the step of co-extrusion molding, the mass ratio of the mixture of the pulverized coals of the major and minor caking coals and the pulverized coals of the Shandong fat coals to the molding binder is 100:38 to 100: 36.
8. The method of producing a coal-based columnar activated carbon as claimed in claim 1, wherein in the activation step, the crude activated carbon material is activated by physical activation using the activation furnace.
9. The process for producing a coal-based columnar activated carbon as claimed in claim 8, wherein the activating agent used in the physical activation method is deionized water; and/or the amount of the activator used in the physical activation method is 1.2ml/(100 g.min).
10. A coal-based columnar activated carbon produced by the method for producing a coal-based columnar activated carbon according to any one of claims 1 to 9.
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