CN116161658A - Bamboo columnar activated carbon and preparation method and application thereof - Google Patents

Bamboo columnar activated carbon and preparation method and application thereof Download PDF

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Publication number
CN116161658A
CN116161658A CN202211728363.8A CN202211728363A CN116161658A CN 116161658 A CN116161658 A CN 116161658A CN 202211728363 A CN202211728363 A CN 202211728363A CN 116161658 A CN116161658 A CN 116161658A
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activated carbon
bamboo
voc
columnar
switching valve
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朱永太
张健
苟远波
王汝成
余玲
郑兴福
王强民
魏浩栋
戴勇
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Tianneng Carbon Jiangsu Co ltd
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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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses bamboo columnar activated carbon which comprises the following raw materials in parts by weight: bamboo charcoal: 45-65 parts of bamboo tar binder: 30-45 parts of additive: 1-5 parts of distilled water: 1-20 parts of a preparation method comprises the steps of (1) proportioning and pulverizing; (2) mixing and molding; (3) drying; (4) heat treatment; (5) the bamboo columnar activated carbon is formed activated carbon prepared by bonding and activating carbon powder through a certain process, has the advantages of good wear resistance, low bulk density, strong adsorption capacity, convenient recovery and the like, is widely applied to purifying water quality, adsorbing harmful gases, preparing electrode materials and the like, and has wide development prospect.

Description

Bamboo columnar activated carbon and preparation method and application thereof
Technical Field
The invention relates to the technical field of activated carbon, in particular to bamboo columnar activated carbon, and a preparation method and application thereof.
Background
The bamboo charcoal is generally formed by high Wen Jue oxygen dry distillation of bamboo or bamboo processing residues over 3-5 years, the fixed carbon content of the bamboo charcoal is more than 85%, the ash content is 2% -4%, the charcoal is compact, the specific gravity is large, the gaps are more, and the specific surface area can be over 500m 2/g.
The columnar activated carbon is formed activated carbon which is prepared by bonding and activating biomass materials or carbon powder through a certain process, and has the advantages of good wear resistance, low bulk density, strong adsorption capacity, convenient recovery and the like. At present, the formed active carbon is widely applied to purifying water quality, absorbing harmful gas, preparing electrode materials and the like, has wide development prospect, and the raw materials for preparing the formed active carbon at present mainly take wood and coal as main materials, and the preparation process is mature and stable, however, the development of columnar active carbon is limited due to excessive development of wood resources and non-renewable coal resources. The bamboo activated carbon has developed pore structure and good adsorption performance, so that the preparation of the columnar activated carbon by taking bamboo as a raw material can not only improve the high value-added utilization of bamboo resources, but also provide abundant raw materials for the preparation of the columnar activated carbon.
At present, the bamboo activated carbon has more defects in use, firstly: the bamboo activated carbon is poor in mechanical strength due to the restriction of the existing activation equipment process, so that the use of the bamboo activated carbon is affected; secondly, it is: compared with the gas activation method, the bamboo activated carbon prepared by the chemical activation method has the advantages of complex preparation process, serious equipment corrosion and serious environmental pollution, and the finished carbon can be used only by cleaning treatment. Chinese patent publication No. CN1128100C, CN101195485A, CN102502626a discloses a method for preparing bamboo activated carbon, but the activated carbon is used after chemical cleaning treatment, and the preparation process is complex and the reaction energy consumption is high. Therefore, how to improve the manufacturing process and the strength and the adsorption performance of the product are key to developing the bamboo activated carbon activation process.
Disclosure of Invention
The invention aims to provide bamboo columnar activated carbon as well as a preparation method and application thereof, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a bamboo columnar activated carbon consists of the following raw materials in parts by weight:
bamboo charcoal: 45-65 parts of a compound containing, by weight,
bamboo tar binder: 30-45 parts of a lubricant, wherein the lubricant comprises,
additive: 1-5 parts of a compound, wherein,
distilled water: 1-20 parts of a compound, wherein,
the obtained bamboo columnar activated carbon has the appearance of cylindrical black small particles, the diameter of the columnar activated carbon is 1-8mm, the filling density of the columnar activated carbon is 230-440g/l, the strength of the columnar activated carbon is 75-99%, the specific surface area of the columnar activated carbon is 1000-1300 square meters/g, the carbon tetrachloride adsorption value of 45-95%, the iodine value of 950-1350mg/g, the methylene blue adsorption value of 160-280mg/g, the molasses value of 190-360 and the benzene adsorption value of 15-40%.
Preferably, the bamboo charcoal is a product obtained by dry distillation of bamboo heads, bamboo stems and bamboo tips, the bulk specific gravity is 200-490g/l, the ash content is 2.5-6.8%, the volatile matter is 4.4-19% and the fixed charcoal is 65-90%.
Preferably, the bamboo tar is oily byproduct obtained by dry distillation of bamboo wood, and has black brown color and density of 1.03-1.5g/cm 3 The black liquor of bamboo pulp is the waste liquor produced in pulping bamboo material and is black brown.
Preferably, the additive is sodium silicate, carboxymethyl cellulose and calcium oxide, wherein the mixture of the sodium silicate, the carboxymethyl cellulose and the calcium oxide is at any ratio, and the density of the carboxymethyl cellulose is 0.5-0.7g/cm 3 The density of the sodium silicate is 1.5-3.5 g/cm 3 The density of the calcium oxide is 3.32-3.35 g/cm 3 。
A preparation method of bamboo columnar activated carbon comprises the following steps:
firstly, batching and pulverizing: crushing bamboo charcoal, sieving with 200 mesh sieve, taking 45-55 parts, placing into 105 ℃ drying oven, baking for 12h, sealing and preserving for standby;
secondly, mixing and forming: mixing bamboo charcoal powder with 80 ℃ bamboo tar in a certain mass ratio, wherein the adding amount of the tar is 20%, 30% and 40% of the mass of the bamboo charcoal powder respectively, adding a proper amount of distilled water, stirring for 25min, putting the fully and uniformly mixed raw materials into a self-made extruder, extruding under the pressure of about 6.5MPa, extruding and molding by a die with the discharge aperture of 1-10mm, and drying the extruded materials in an oven for 24h;
third, heat treatment: the columnar formed carbon is placed into a self-made activation furnace, and columnar activated carbon is prepared under sufficient steam, different activation temperatures and activation time, wherein the activation temperature is 750-950 ℃, and the activation time is 1-5 h;
fourth, cooling and screening: and (3) transferring the activated material from the rotary furnace into a cooling device, reducing the temperature of the material to below 45 ℃, and sieving to remove the powder generated in the preparation process, thereby obtaining the bamboo columnar activated carbon.
Preferably, the self-made extruder adopts a chelating structure, adopts steam to heat the jacket and the stirring shaft, and has the stirring speed of 50-80 rpm.
The bamboo columnar activated carbon is applied to adsorption and recovery of Volatile Organic Compounds (VOC) in industrial environment air.
Preferably, an adsorption recovery device is adopted to adsorb and recover organic gas volatile matter V0C in air, the adsorption recovery device comprises an active carbon adsorption tower, a VOC collector and a draught fan, the bottom of the active carbon adsorption tower is connected with a nitrogen pipeline, the side surface of the active carbon adsorption tower is provided with a VOC gas inlet to be recovered, the VOC gas inlet pipeline to be recovered is provided with a first switching valve, and the nitrogen pipeline is provided with a third switching valve; the outlet at the top of the activated carbon adsorption tower is respectively connected with a VOC collector and an induced draft fan; a second switching valve is arranged on a pipeline connected with the active carbon adsorption tower and the induced draft fan, and a fourth switching valve is arranged on a pipeline connected with the active carbon adsorption tower and the VOC collector; the top of the VOC collector is provided with a gas outlet connected with an induced draft fan, and the bottom of the VOC collector is provided with a VOC liquid outlet.
Preferably, when the Volatile Organic Compounds (VOC) in the organic gas are adsorbed and recovered, the bamboo columnar activated carbon is filled into the activated carbon adsorption tower, the third switching valve and the fourth switching valve are closed, the first switching valve and the second switching valve are opened, the volatile organic gases (VOC) released in the industrial environment are introduced into the adsorption tower by the suction force of the induced draft fan, the volatile organic gases are absorbed by the activated carbon, after the activated carbon is adsorbed and saturated, the first switching valve and the second switching valve are closed, the third switching valve and the fourth switching valve are opened to enter an analysis state, the VOC substances adsorbed in the holes of the activated carbon are separated out from the holes of the activated carbon along with nitrogen, enter the VOC collector, and the VOC is separated from the nitrogen by cooling, so that the recovery of the VOC is realized.
Preferably, 280-320kg of benzene can be treated and recovered by 1 ton of bamboo columnar activated carbon at a time.
Compared with the prior art, the invention has the beneficial effects that:
1. the columnar activated carbon is formed activated carbon prepared by bonding and activating carbon powder through a certain process, has the advantages of good wear resistance, low bulk density, high strength, strong adsorption capacity, convenient recovery, high regeneration yield, high index recovery rate and the like, is widely applied to purifying water quality, adsorbing harmful gas, preparing electrode materials and the like, and has wide development prospect;
2. taking bamboo charcoal as a raw material, taking bamboo tar as a binder, and preparing columnar active carbon by extrusion molding and steam activation, wherein the 850 ℃ is a proper activation temperature; when the bamboo tar consumption is 30%, the activation temperature is 850 ℃ and the activation time is 3 hours, the column-shaped activated carbon iodine adsorption value is 1096mg.g -1 The methylene blue adsorption value is 131 mg.g -1 The yield is 43.33%, the strength is 97.89%, and the method has good adsorption performance and higher yield and strength;
3. when the bamboo tar consumption is 30%, the activation temperature is 850 ℃ and the activation time is 3 hours, the N2 isothermal adsorption line of the columnar activated carbon is I type, and the specific surface area is 875.73m 2 ·g -1 The total pore volume is 0.471cm3.g -1 The micropore volume is 0.394cm3.g -1 The microporosity is as high as 83.6%, the prepared columnar activated carbon has a developed micropore structure, and the activated bamboo tar has less residues, and mainly plays a role in supporting a framework and enhancing the strength of the columnar activated carbon.
Drawings
Fig. 1 shows an adsorption recovery apparatus for adsorbing VOCs using bamboo columnar activated carbon.
In the reference numerals: 1. an activated carbon adsorption tower; 2. a VOC collector; 3. an induced draft fan; 4. a first switching valve plate; 5. a second switching valve; 6. a third switching valve; 7. and a second switching valve.
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
Examples: as shown in fig. 1, the present invention provides a technical solution: a bamboo columnar activated carbon consists of the following raw materials in parts by weight:
bamboo charcoal: 45-65 parts of a compound containing, by weight,
bamboo tar binder: 30-45 parts of a lubricant, wherein the lubricant comprises,
additive: 1-5 parts of a compound, wherein,
distilled water: 1-20 parts of a compound, wherein,
the obtained bamboo columnar activated carbon has the appearance of cylindrical black small particles, the diameter of the columnar activated carbon is 1-8mm, the filling density of the columnar activated carbon is 230-440g/l, the strength of the columnar activated carbon is 75-99%, the specific surface area of the columnar activated carbon is 1000-1300 square meters/g, the carbon tetrachloride adsorption value of 45-95%, the iodine value of 950-1350mg/g, the methylene blue adsorption value of 160-280mg/g, the molasses value of 190-360 and the benzene adsorption value of 15-40%.
In the embodiment, the bamboo charcoal is a product obtained by dry distillation of bamboo heads, bamboo stems and bamboo tips, the bulk specific gravity is 200-490g/l, the ash content is 2.5-6.8%, the volatile matter is 4.4-19% and the fixed charcoal is 65-90%.
In this embodiment, the bamboo tar is oily byproduct obtained by dry distillation of bamboo, and has a black brown color and a density of 1.03-1.5g/cm 3 The black liquor of bamboo pulp is the waste liquor produced in pulping bamboo material and is black brown.
In this embodiment, the additive is sodium silicate, carboxymethyl cellulose, or calcium oxide, and the ratio of the three is arbitraryMixing the above materials, and mixing the carboxymethyl cellulose with density of 0.5-0.7g/cm 3 The density of the sodium silicate is 1.5-3.5 g/cm 3 The density of the calcium oxide is 3.32-3.35 g/cm 3 。
A preparation method of bamboo columnar activated carbon comprises the following steps:
firstly, batching and pulverizing: crushing bamboo charcoal, sieving with 200 mesh sieve, taking 45-55 parts, placing into 105 ℃ drying oven, baking for 12h, sealing and preserving for standby;
secondly, mixing and forming: mixing bamboo charcoal powder with 80 ℃ bamboo tar in a certain mass ratio, wherein the adding amount of the tar is 20%, 30% and 40% of the mass of the bamboo charcoal powder respectively, adding a proper amount of distilled water, stirring for 25min, putting the fully and uniformly mixed raw materials into a self-made extruder, extruding under the pressure of about 6.5MPa, extruding and molding by a die with the discharge aperture of 1-10mm, and drying the extruded materials in an oven for 24h;
third, heat treatment: placing the columnar formed carbon into a self-made activation furnace, and preparing columnar activated carbon under sufficient steam, different activation temperatures and activation time, wherein the activation temperature is 750 ℃, 800 ℃,850 ℃, 900 ℃, 950 ℃ and the activation time is 1h, 2h, 3h, 4h and 5h;
fourth, cooling and screening: and (3) transferring the activated material from the rotary furnace into a cooling device, reducing the temperature of the material to below 45 ℃, and sieving to remove the powder generated in the preparation process, thereby obtaining the bamboo columnar activated carbon.
In this example, the self-made extruder was a chelate structure and steam was used to heat the jacket and stirring shaft at a stirring rate of 50-80 rpm.
The bamboo columnar activated carbon is applied to the adsorption and recovery of Volatile Organic Compounds (VOC) in industrial ambient air.
In the embodiment, an adsorption recovery device is adopted to adsorb and recover organic gas volatile matters (VOC) in air, the adsorption recovery device is shown in fig. 1, and comprises an active carbon adsorption tower 1, a VOC collector 2 and an induced draft fan 3, the bottom of the active carbon adsorption tower 1 is connected with a nitrogen pipeline, the side surface of the active carbon adsorption tower 1 is provided with a VOC gas inlet to be recovered, the VOC gas inlet pipeline to be recovered is provided with a first switching valve 4, and the nitrogen pipeline is provided with a third switching valve 6; the top outlet of the activated carbon adsorption tower 1 is respectively connected with the VOC collector 2 and the induced draft fan 3; a second switching valve 5 is arranged on a pipeline connected with the active carbon adsorption tower 1 and the induced draft fan 3, and a fourth switching valve 7 is arranged on a pipeline connected with the active carbon adsorption tower 1 and the VOC collector 2; the top of the VOC collector 2 is provided with a gas outlet connected with a draught fan 3, and the bottom is provided with a VOC liquid outlet.
In this embodiment, when the Volatile Organic Compounds (VOCs) are adsorbed and recovered, the bamboo columnar activated carbon is loaded into the activated carbon adsorption tower, the third switching valve 6 and the fourth switching valve 7 are closed, the first switching valve 4 and the second switching valve 5 are opened, the volatile organic gases (VOCs) released in the industrial environment are introduced into the activated carbon adsorption tower 1 by the suction force of the induced draft fan 3, and are absorbed by the activated carbon 1, after the activated carbon is adsorbed and saturated, the first switching valve 4 and the second switching valve are closed, the third switching valve 5 and the fourth switching valve 7 are opened, the activated carbon enters an analysis state, the VOCs adsorbed in the activated carbon holes are separated out from the holes of the activated carbon along with nitrogen, and enter the VOC collector 2, and the VOCs are separated from the nitrogen by cooling, so that the recovery of VOCs is realized.
In this example, 300kg of benzene can be recovered by one-time treatment of 1 ton of bamboo columnar activated carbon.
The yield of the activated carbon is calculated according to the following formula:
Y=m1m×100%；
wherein Y is the yield of columnar activated carbon, m1 is the mass of the columnar activated carbon, and m is the mass of absolute dry columnar formed carbon.
Figure 644081DEST_PATH_IMAGE001
TABLE 1 influence of adsorption Properties of columnar activated carbon under different preparation conditions
The data are shown in Table 1, and the iodine adsorption value and methylene blue adsorption value of the columnar activated carbon are both increased with increasing tar usage, and when the tar addition amount is 40%, the iodine adsorption value and methylene blue adsorption value of the columnar activated carbon are 1185 mg.g, respectively -1 、147mg·g -1 All are the largest, which indicates that the increase of tar consumption is helpful for preparing columnar active carbon with developed pore structure. When in focusWhen the oil consumption is 20%, the prepared activated carbon has the lowest strength of 90.32%; with the further increase of the tar consumption, the activated carbon strength is increased from 97.98% to 98.02% when the tar consumption is increased from 30% to 40%, and the increasing trend is slowed down. In addition, the yield of columnar activated carbon also increases with the increase of the tar consumption, because the tar and the bamboo carbon are both changed into activated carbon through high-temperature activation, thereby increasing the yield of the activated carbon.
Along with the increase of the tar consumption, the iodine adsorption value, the methylene blue adsorption value, the intensity and the yield of the columnar activated carbon are all increased, and the adsorption performance and the yield of the activated carbon are improved. However, since tar is a non-renewable resource, the problem is to reduce the tar consumption and determine the tar addition amount to be 30% when preparing the columnar activated carbon on the premise of meeting the strength requirement of the columnar activated carbon.
As the activation temperature increases, the iodine adsorption value of the columnar activated carbon tends to increase first and then decrease, and the methylene blue adsorption value tends to increase; the highest iodine adsorption value is 1157mg.g when the activation temperature is 900 DEG C -1 This is because the pore structure of the activated carbon is largely opened as the activation temperature increases, and both the iodine adsorption value and the methylene blue adsorption value are in an increasing trend; when the activation temperature is too high, reaming reaction occurs, so that a large number of microporous structures are ablated to form macropores, the micropore growth rate is lower than the reaming rate, the iodine adsorption value is reduced, and the methylene blue adsorption value is still increased. The strength and yield of the columnar activated carbon all tend to decrease along with the increase of the activation temperature, when the activation temperature is increased from 750 ℃ to 950 ℃, the strength is reduced from 98.74% to 93.85%, and the yield is reduced from 55.88% to 30.59%, because the activation reaction is promoted along with the increase of the activation temperature, so that the activation reaction is more sufficient in the same time.
When the activation temperature is increased from 850 ℃ to 900 ℃, the columnar activated carbon has the phenomena of rapid yield decrease and slow increase of iodine adsorption value, which greatly influences the economic benefit of the carbon-making enterprises; furthermore, an excessively high activation temperature places higher heat resistance demands on the activation equipment. Thus, a suitable activation temperature for the selected columnar activated carbon is comprehensively considered to be 850 ℃.
The iodine adsorption value of the columnar activated carbon tends to rise and then fall along with the extension of the activation time, and the highest iodine adsorption value of the columnar activated carbon is 1 145 mg g when the activation time is 4h -1 The methylene blue adsorption value always rises along with the extension of the activation time, and the main reason is that as the activation reaction continues, the columnar carbon fully contacts with water vapor to react, so that the columnar carbon forms a large number of micropore structures, and as the activation reaction further proceeds, the growth rate of micropores is lower than the ablation rate of micropores, and the iodine adsorption value is reduced. In addition, the strength and yield of the columnar activated carbon all show a decreasing trend along with the extension of the activation time, when the activation time is prolonged to 5h from 1. 1h, the strength of the activated carbon is decreased to 94.49% from 98.98%, and the yield is decreased to 33.25% from 53.12%.
Comprehensively analyzing the influence of tar consumption, activation temperature and activation time on the performance of the columnar active carbon, when the tar consumption is 30 percent, the activation temperature is 850 ℃, the activation time is 3h, the iodine adsorption value of the columnar active carbon is 1096 mg.g -1 The yield is 43.33%, the strength is 97.89%, and the product has good adsorption performance and high yield and strength. In actual production, according to the customer demand, under the premise of meeting the columnar activated carbon strength, the iodine adsorption value, the methylene blue adsorption value and the reliability of the activation equipment, the higher activation temperature and the shorter activation time are selected, so that the effects of energy conservation and efficiency improvement can be achieved.
The columnar activated carbon is formed activated carbon prepared by bonding and activating carbon powder through a certain process, has the advantages of good wear resistance, low bulk density, strong adsorption capacity, convenient recovery and the like, is widely applied to purifying water quality, adsorbing harmful gases, preparing electrode materials and the like, and has wide development prospect.
Taking bamboo charcoal as a raw material, taking bamboo tar as a binder, and preparing columnar active carbon by extrusion molding and steam activation, wherein the 850 ℃ is a proper activation temperature; when the bamboo tar consumption is 30%, the activation temperature is 850 ℃ and the activation time is 3 hours, the column-shaped activated carbon iodine adsorption value is 1096mg.g -1 The methylene blue adsorption value is 131 mg.g -1 The yield is 43.33 percent, the strength is 97.89 percent, and the method hasHas good adsorption performance, higher yield and strength.
When the bamboo tar consumption is 30%, the activation temperature is 850 ℃ and the activation time is 3 hours, the N2 isothermal adsorption line of the columnar activated carbon is I type, and the specific surface area is 875.73 m2.g -1 The total pore volume is 0.471cm3.g -1 The micropore volume is 0.394cm3.g -1 The microporosity is as high as 83.6%, the prepared columnar activated carbon has a developed micropore structure, and the activated bamboo tar has less residues, and mainly plays a role in supporting a framework and enhancing the strength of the columnar activated carbon.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected" and "connected" are to be construed broadly, and may be either a fixed connection or a removable connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Claims (10)

1. A bamboo columnar activated carbon is characterized in that: the composite material consists of the following raw materials in parts by weight:
bamboo charcoal: 45-65 parts of a compound containing, by weight,
bamboo tar binder: 30-45 parts of a lubricant, wherein the lubricant comprises,
additive: 1-5 parts of a compound, wherein,
distilled water: 1-20 parts of a compound, wherein,
the obtained bamboo columnar activated carbon has the appearance of cylindrical black small particles, the diameter of the columnar activated carbon is 1-8mm, the filling density of the columnar activated carbon is 230-440g/l, the strength of the columnar activated carbon is 75-99%, the specific surface area of the columnar activated carbon is 1000-1300 square meters/g, the carbon tetrachloride adsorption value of 45-95%, the iodine value of 950-1350mg/g, the methylene blue adsorption value of 160-280mg/g, the molasses value of 190-360 and the benzene adsorption value of 15-40%.
2. The bamboo columnar activated carbon according to claim 1, wherein: the bamboo charcoal is prepared from bamboo head, bamboo stem, and bamboo tip by dry distillation, and has bulk density of 200-490g/l, ash content of 2.5-6.8%, volatile content of 4.4-19%, and fixed carbon of 65-90%.
3. The bamboo columnar activated carbon according to claim 1, wherein: the bamboo tar is oily byproduct obtained by dry distillation of bamboo wood, and has black brown color and density of 1.03-1.5g/cm 3 The black liquor of bamboo pulp is the waste liquor produced in pulping bamboo material and is black brown.
4. The bamboo columnar activated carbon according to claim 1, wherein: the additive is sodium silicate, carboxymethyl cellulose and calcium oxide, wherein the density of the carboxymethyl cellulose is 0.5-0.7g/cm 3 The density of the sodium silicate is 1.5-3.5 g/cm 3 The density of the calcium oxide is 3.32-3.35 g/cm 3 。
5. A method for preparing bamboo columnar activated carbon as claimed in any one of claims 1 to 4, comprising the steps of:
firstly, batching and pulverizing: crushing bamboo charcoal, sieving with 200 mesh sieve, taking 45-55 parts, placing into 105 ℃ drying oven, baking for 12h, sealing and preserving for standby;
secondly, mixing and forming: mixing bamboo charcoal powder with 80 ℃ bamboo tar, wherein the adding amount of the tar is 20%, 30% and 40% of the mass of the bamboo charcoal powder respectively, adding a proper amount of distilled water, stirring for 25min, putting the fully and uniformly mixed raw materials into a self-made extruder, wherein the extrusion pressure of the self-made extruder is 6.5MPa, the discharge aperture of a die is 1-10mm, extruding and molding, and putting the extruded materials into an oven for drying for 24h;
third, heat treatment: the columnar formed carbon is placed into a self-made activation furnace, and columnar activated carbon is prepared under sufficient steam, different activation temperatures and activation time, wherein the activation temperature is 750-950 ℃, and the activation time is 1-5 h;
fourth, cooling and screening: and (3) transferring the activated material from the rotary furnace into a cooling device, reducing the temperature of the material to below 45 ℃, and sieving to remove the powder generated in the preparation process, thereby obtaining the bamboo columnar activated carbon.
6. The method for preparing bamboo columnar activated carbon according to claim 5, wherein the method comprises the following steps: the self-made extruder adopts a chelating structure, adopts steam to heat the jacket and the stirring shaft, and the stirring speed is 50-80 rpm.
7. Use of a bamboo columnar activated carbon according to any one of claims 1-4 for adsorption and recovery of organic gas volatile VOC in industrial ambient air.
8. The use according to claim 7, characterized in that: the method comprises the steps that an adsorption recovery device is used for adsorbing and recovering organic gas volatile VOC in air, the adsorption recovery device comprises an active carbon adsorption tower (1), a VOC collector (2) and an induced draft fan (3), the bottom of the active carbon adsorption tower (1) is connected with a nitrogen pipeline, a VOC gas inlet to be recovered is arranged on the side face of the active carbon adsorption tower (1), a first switching valve (4) is arranged on the VOC gas inlet pipeline to be recovered, and a third switching valve (6) is arranged on the nitrogen pipeline; the top outlet of the activated carbon adsorption tower (1) is respectively connected with the VOC collector (2) and the induced draft fan (3), a second switching valve (5) is arranged on a pipeline connected with the activated carbon adsorption tower (1) and the induced draft fan (3), a fourth switching valve (7) is arranged on a pipeline connected with the activated carbon adsorption tower (1) and the VOC collector (2), the top of the VOC collector (2) is provided with a gas outlet connected with the induced draft fan (3), and the bottom of the VOC collector is provided with a VOC liquid outlet.
9. The use according to claim 7, characterized in that: when adsorbing and recycling organic gas volatile matter VOC, loading bamboo columnar activated carbon into an activated carbon adsorption tower, closing a third switching valve (6) and a fourth switching valve (7), opening a first switching valve (4) and a second switching valve (5), introducing the volatile organic gas VOC released in the industrial environment into the activated carbon adsorption tower (1) through the suction force of a draught fan (3), absorbing the volatile organic gas VOC by the activated carbon (1), closing the first switching valve (4) and the second switching valve after the activated carbon is adsorbed and saturated, opening the third switching valve (5) and the fourth switching valve (7), entering an analysis state, precipitating VOC substances adsorbed in activated carbon holes along with nitrogen from the holes of the activated carbon, entering a VOC collector (2), and separating VOC and nitrogen through cooling to realize the recovery of VOC.
10. The use according to claim 7, characterized in that: 280-320kg of benzene can be treated and recovered by 1 ton of bamboo columnar activated carbon at one time.
CN202211728363.8A 2022-12-30 2022-12-30 Bamboo columnar activated carbon and preparation method and application thereof Pending CN116161658A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117416957A (en) * 2023-12-19 2024-01-19 成都达奇科技股份有限公司 Method for preparing activated carbon and activated carbon
CN117416957B (en) * 2023-12-19 2024-04-26 成都达奇科技股份有限公司 Method for preparing activated carbon and activated carbon

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117416957A (en) * 2023-12-19 2024-01-19 成都达奇科技股份有限公司 Method for preparing activated carbon and activated carbon
CN117416957B (en) * 2023-12-19 2024-04-26 成都达奇科技股份有限公司 Method for preparing activated carbon and activated carbon

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