CN115557498A - Activated carbon, raw material and blank for preparing activated carbon and preparation method of blank - Google Patents
Activated carbon, raw material and blank for preparing activated carbon and preparation method of blank Download PDFInfo
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- CN115557498A CN115557498A CN202211471937.8A CN202211471937A CN115557498A CN 115557498 A CN115557498 A CN 115557498A CN 202211471937 A CN202211471937 A CN 202211471937A CN 115557498 A CN115557498 A CN 115557498A
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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
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/336—Preparation characterised by gaseous activating agents
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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
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
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Abstract
The invention discloses activated carbon, a raw material and a blank for preparing the activated carbon and a preparation method of the blank, and belongs to the technical field of activated carbon. The raw materials for preparing the high-forming-rate activated carbon comprise, by weight, 55-70 parts of bamboo charcoal powder, 20-50 parts of porous clay mineral, 3-8 parts of organic binder, 5-10 parts of inorganic binder and 30-45 parts of water. The honeycomb activated carbon has the advantages of low cost of raw materials, no use of harmful raw materials, no need of aging, obvious shortening of production period, high molding rate of the prepared honeycomb activated carbon, no defects of cracking, deformation and the like, and obvious improvement of production efficiency. Proved by verification, the obtained honeycomb-shaped activated carbon has high iodine value and compressive strength, has strong water resistance and water impact resistance, can be stably applied to water environment, and has strong practicability.
Description
Technical Field
The invention relates to the technical field of activated carbon, in particular to the technical field of activated carbon with a certain configuration, and specifically relates to activated carbon, raw materials and blanks for preparing the activated carbon, and a preparation method of the blanks.
Background
The honeycomb activated carbon has the advantages of high aperture ratio, large geometric surface area, wear resistance, strong dust resistance, small pressure loss of a bed layer, high adsorption and desorption speed, and can be conveniently used for gas purification and solvent recovery and used as a carrier of a catalyst. Currently, methods for preparing honeycomb activated carbon include a coating method, which is rarely used due to the easy occurrence of coating detachment, and a bulk extrusion method, which is currently the most widely used preparation method in China. The main steps of the integral extrusion method are mixing, kneading and extrusion molding of coal charcoal powder, binder, water and other raw materials, wherein the raw materials and the proportion of the raw materials are the main reasons influencing the molding rate, the performance and the application of the honeycomb activated carbon.
At present, the defects of the honeycomb activated carbon of the traditional formulation and extrusion process mainly include the following aspects:
(1) Coal reserves are limited and non-renewable, mining is limited, and prices rise severely;
(2) The safety is poor, and if phenolic resin is used as a binder, formaldehyde is contained in the phenolic resin, and harmful gas can be generated at high temperature;
(3) The preparation process usually needs an aging step, and a special lubricant is added for auxiliary forming, so that the production period of the honeycomb activated carbon is greatly prolonged;
(4) The problems that the honeycomb green body is not formed or the forming rate is low, the green body humidity is high, the honeycomb green body is deformed and the like easily occur in the production process;
(5) The mechanical strength is insufficient, the iodine value is low, the service cycle is short, and the operation cost is increased invisibly.
Disclosure of Invention
The invention mainly aims to provide activated carbon, raw materials and blanks for preparing the activated carbon and a preparation method of the blanks, so as to solve the technical problems of shortage of coal powdered carbon resources, poor safety, long production period, poor molding rate and short service cycle in the prior art.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a raw material for preparing activated carbon, the technical scheme is as follows:
the raw materials for preparing the activated carbon comprise, by weight, 55-70 parts of bamboo charcoal powder, 20-50 parts of porous clay mineral, 3-8 parts of organic binder, 5-10 parts of inorganic binder and 22-50 parts of water.
As a further improvement of the first aspect of the invention, the bamboo charcoal powder is obtained by carbonizing phyllostachys pubescens at 500-600 ℃ for 1-2 h; the granularity of the bamboo charcoal powder is less than or equal to 200 meshes.
As a further improvement of the first aspect of the invention, the porous clay mineral comprises one or more of kaolin, sepiolite and diatomite; the organic binder is hydroxypropyl methyl cellulose; the inorganic binder is silica sol.
As a further improvement of the first aspect of the invention, the porous clay mineral comprises 5-30 parts of kaolin and 5-30 parts of sepiolite.
As a further improvement of the first aspect of the invention, the weight ratio of the bamboo charcoal powder to the hydroxypropyl methyl cellulose is 100 (5-10); the weight ratio of the total weight of the carbon powder, the hydroxypropyl methylcellulose and the porous clay mineral to the silica sol is 100 (6-8); the weight ratio of the bamboo charcoal powder to the water is 100 (50-65).
In order to achieve the above object, according to a second aspect of the present invention, there is provided a green body for producing activated carbon, the technical solution is as follows:
a green body for use in the production of activated carbon, comprising the starting material according to the first aspect described above.
In order to achieve the above object, according to a third aspect of the present invention, there is provided a method for producing a green body for producing activated carbon, the method comprising:
the preparation method of the green body for preparing the activated carbon is obtained by mixing, kneading, extruding and molding the raw materials of the first aspect and drying.
As a further improvement of the third aspect of the invention, the mixing is to mix the bamboo charcoal powder, the organic binder and the porous clay mineral into a premix; the kneading is to mix the premix, the inorganic binder and water into pug; the extrusion molding is to extrude and mold the pug into a green body with a honeycomb-hole-shaped structure under the molding pressure of 10-20 Mpa.
In order to achieve the above object, according to a fourth aspect of the present invention, there is provided activated carbon, the technical solution is as follows:
the activated carbon is obtained by carrying out secondary carbonization and activation on the blank in the second aspect or the blank prepared by the preparation method in the third aspect.
As a further improvement of the fourth aspect of the invention, the secondary carbonization is carried out for 1 to 2 hours at a temperature of between 500 and 600 ℃; the activation is carried out for 1 to 2 hours at the temperature of 850 to 950 ℃; the active carbon is in a honeycomb shape.
In order to achieve the above object, according to a fifth aspect of the present invention, there is provided a method for preparing activated carbon, the method comprising:
the preparation method of the activated carbon comprises the following steps: obtaining the blank body of the second aspect or the blank body prepared by the preparation method of the third aspect; and carrying out secondary carbonization and activation on the blank to obtain the active carbon.
The invention has the following advantages:
the bamboo wood is rich in cellulose, hemicellulose and lignin, and the substances can form rich pore channel structures after pyrolysis, so the bamboo charcoal powder has higher specific surface area and can improve the application effect of the activated carbon; meanwhile, the bamboo wood has the characteristic of reproducibility, particularly the phyllostachys pubescens has a short growth period and a wide distribution range, so that the production cost of the honeycomb activated carbon can be remarkably reduced by adopting the bamboo charcoal powder.
The organic binder and the inorganic binder are matched with each other, so that the binding effect is good, the selection range of the binder type is wider, and the use safety of the binder is favorably improved. Particularly, when the organic binder is hydroxypropyl methyl cellulose, the hydroxypropyl methyl cellulose has higher surface activity and lubricity after being dissolved in water, and has the advantages of thickening capacity, pH stability, water retention property, stability, excellent film forming property, dispersibility, cohesiveness and the like, so that the hydroxypropyl methyl cellulose can be uniformly distributed in water without aging. When the inorganic binder is silica sol, the silica sol can not only exert the binding effect, but also has a relatively large specific surface area due to the very small particle size (generally 5-100 nm) of colloidal particles in the silica sol, and can be well dispersed in the material, and simultaneously, the silica sol can remove water molecules after being heated to form Si-O-Si bonds, wherein the network pores formed by the bonds can play a role of supporting a skeleton, and when the silica sol and cellulose substances are used together, the network pores can shield residual hydroxyl groups, reduce the sensitivity of a sample to water and further play a role of increasing the water resistance.
The porous clay mineral has fine particles, large specific surface area, unique pore channel structure and certain adsorption performance, has good plasticity after being mixed with other raw materials, and can play a certain role in auxiliary forming in the kneading process, thereby obviously improving the forming rate of the honeycomb green body; in addition, the porous clay mineral has extremely high thermal stability, and can be used as a skeleton structure to support the whole body in the subsequent secondary carbonization and activation processes, so that the configuration of a blank cannot be changed under high-temperature calcination, and the product configuration of the activated carbon is ensured. Especially when the porous clay mineral is a combination of kaolin and sepiolite, the plasticity and thermal stability are best, and the optimal forming rate can be obtained.
Therefore, the honeycomb activated carbon has the advantages of low cost of raw materials, no use of harmful raw materials, no need of aging, obvious shortening of the production period, high molding rate of the prepared honeycomb activated carbon, no defects of cracking, deformation and the like, and obvious improvement of the production efficiency. The verification proves that the obtained honeycomb-shaped activated carbon has high iodine value and compressive strength, has strong water resistance and water impact resistance, can be stably applied to water environment, obviously prolongs the service cycle and has strong practicability. It is apparent that the raw material of the present invention can be used for the preparation of activated carbon of other configurations in addition to the honeycomb configuration, since the present invention has an excellent molding rate in the preparation of honeycomb activated carbon.
The present invention will be further described with reference to the following embodiments. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The present invention will now be described more fully hereinafter. Those skilled in the art will be able to practice the invention based on these descriptions. Before the present invention is explained, it is to be noted that:
the technical solutions and features provided in the present invention in each part including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.
With respect to the terms and units of the present invention, the terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections, are intended to cover non-exclusive inclusions.
The term "forming rate" means the ratio of the number of extruded whole honeycomb blanks to the total number of honeycomb blanks formed by a forming machine within the specified number of extruded blanks. The term "honeycomb" refers to the blank or activated carbon having cells spaced axially, the cross-section of the cells may be circular or rectangular, and the shape of the blank or activated carbon may be circular or prismatic.
The raw material for preparing the activated carbon comprises, by weight, 55-70 parts of bamboo charcoal powder, 20-50 parts of porous clay mineral, 3-8 parts of organic binder, 5-10 parts of inorganic binder and 22-50 parts of water. The bamboo charcoal powder is obtained by carbonizing dry phyllostachys pubescens at 600 ℃ for 2h, the carbonizing atmosphere is nitrogen, and the granularity of the bamboo charcoal powder is 200 meshes. The porous clay mineral is composed of kaolin and sepiolite. The organic binder is hydroxypropylmethylcellulose (hereinafter referred to as "HPMC"). The inorganic binder is silica sol.
The porous clay mineral comprises 5-30 parts of kaolin and 5-30 parts of sepiolite, and preferably, the weight ratio of the kaolin to the sepiolite is 1.
The weight ratio of the bamboo charcoal powder to the hydroxypropyl methyl cellulose (shown as the ratio 1) is 100 (5-10); the weight ratio (expressed as the ratio 2) of the total weight of the carbon powder, the hydroxypropyl methylcellulose and the porous clay mineral to the silica sol is 100 (6-8); the weight ratio of the bamboo charcoal powder to the water (hereinafter, expressed as "ratio 3") is 100 (50-65).
The embodiment of the green body for preparing the activated carbon comprises the raw materials or is prepared by the following method for preparing the green body.
The specific embodiment of the preparation method of the green body for preparing the activated carbon is that the raw materials are mixed, kneaded, extruded and dried to obtain the green body, the bamboo charcoal powder, the organic binder and the porous clay mineral are mixed into a premix in a high-speed mixer, the premix, the inorganic binder and water are mixed into a pug in a kneader, the pug is extruded and molded into the green body with a honeycomb-hole-shaped structure under a hydraulic extruder and a molding pressure of 15Mpa, and the green body is naturally dried for more than 24 hours.
The specific implementation mode of the active carbon is that the active carbon is obtained by performing secondary carbonization and activation on the blank or the blank prepared by the preparation method.
The specific implementation mode of the preparation method of the active carbon comprises the following steps: obtaining the blank or the blank prepared by the preparation method; and carrying out secondary carbonization and activation on the blank to obtain the active carbon.
In the activated carbon and the preparation method thereof, the secondary carbonization is carried out for 2 hours at 600 ℃, the secondary carbonization atmosphere is nitrogen, the activation is carried out for 3 hours at 850 ℃, and the activation atmosphere is carbon dioxide.
The green body and the active carbon are both honeycomb-shaped, the cross sections of the pore channels are rectangular and are arranged in an array shape, and the appearance of the pore channels is quadrangular. One example of a honeycomb shape is: the length of the quadrangular prism is 100mm, the cross section is square, the side length is 100mm, the cross section of the pore channels is square, and the pore channels are arranged in 20-by-20 mode.
The advantageous effects of the present invention will be described below with reference to specific examples.
The raw materials and the weight ratio of the raw materials of examples 1-6 and comparative examples 1-5 are shown in Table 1. Comparative examples 1-2 are different from example 3 in that only one porous clay mineral is used. Comparative examples 3-4 differ from example 3 in that only one binder is used. Comparative example 5 is different from example 3 in that 30 parts of starch was used instead of the porous clay mineral.
The molding rate, iodine value and compressive strength of the corresponding obtained honeycomb activated carbon are shown in Table 2.
TABLE 1
TABLE 2
It can be seen from table 1 and table 2 that the honeycomb activated carbon prepared from the raw materials and the proportion thereof has high forming rate, high iodine value and high compressive strength, which shows that the honeycomb activated carbon has high production efficiency, large specific surface area, good adsorption performance and strong compressive capacity, and therefore has strong practicability.
As can be seen from comparative example 3, comparative examples 1 to 2 and comparative example 5, the porous clay mineral, particularly the porous clay mineral composed of the combination of kaolin and sepiolite, significantly improved the molding rate and compressive strength of the honeycomb-like activated carbon.
It is understood from comparative example 3 and comparative examples 3 to 4 that the combination of HPMC and silica sol can significantly improve the molding rate and compressive strength of the honeycomb activated carbon.
The iodine value is tested by using the 'determination of iodine adsorption value by GB/T14296.8-2015 wooden activated carbon experimental method'.
The compressive strength is tested by adopting a GB/T1964-1996 porous ceramic compressive strength test method.
The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.
Claims (10)
1. Raw materials for preparing activated carbon, which are characterized in that: comprises 55 to 70 parts of bamboo charcoal powder, 20 to 50 parts of porous clay mineral, 3 to 8 parts of organic binder, 5 to 10 parts of inorganic binder and 22 to 50 parts of water according to parts by weight.
2. The feed stock of claim 1, wherein: the bamboo charcoal powder is obtained by carbonizing phyllostachys pubescens at 500-600 ℃ for 1-2 h; the granularity of the bamboo charcoal powder is less than or equal to 200 meshes.
3. The feed stock of claim 1, wherein: the porous clay mineral comprises one or more of kaolin, sepiolite and diatomite; the organic adhesive is hydroxypropyl methyl cellulose; the inorganic adhesive is silica sol.
4. A feedstock according to claim 3 wherein: the porous clay mineral comprises 5-30 parts of kaolin and 5-30 parts of sepiolite.
5. A feedstock according to claim 3 wherein: the weight ratio of the bamboo charcoal powder to the hydroxypropyl methyl cellulose is 100 (5-10); the weight ratio of the total weight of the carbon powder, the hydroxypropyl methylcellulose and the porous clay mineral to the silica sol is 100 (6-8); the weight ratio of the bamboo charcoal powder to the water is 100 (50-65).
6. A green body for use in the preparation of activated carbon, characterized by: comprising the feed as claimed in any of claims 1 to 5.
7. The preparation method of the green body for preparing the activated carbon is characterized by comprising the following steps of: the material as claimed in claim 1-5, which is prepared by mixing, kneading, extrusion molding and drying.
8. The method of claim 7, wherein: the mixing is to mix the bamboo charcoal powder, the organic binder and the porous clay mineral into a premix; the kneading is to mix the premix, the inorganic adhesive and water into pug; the extrusion molding is to extrude and mold the pug into a green body with a honeycomb-shaped porous structure under the molding pressure of 10-20 Mpa.
9. The activated carbon is characterized in that: the green body of claim 6 or the green body prepared by the preparation method of claim 7 or 8 is obtained after secondary carbonization and activation.
10. The activated carbon of claim 9, wherein: the secondary carbonization is carried out for 1 to 2 hours at the temperature of 500 to 600 ℃; the activation is carried out for 1 to 3 hours at the temperature of 850 to 950 ℃; the active carbon is in honeycomb shape.
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