CN110713183A - Molded granular activated carbon prepared from fast growing wood processing residues and preparation method thereof - Google Patents
Molded granular activated carbon prepared from fast growing wood processing residues and preparation method thereof Download PDFInfo
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- CN110713183A CN110713183A CN201910752162.3A CN201910752162A CN110713183A CN 110713183 A CN110713183 A CN 110713183A CN 201910752162 A CN201910752162 A CN 201910752162A CN 110713183 A CN110713183 A CN 110713183A
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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
- C01B32/342—Preparation characterised by non-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
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
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Abstract
The invention relates to a molded granular activated carbon prepared by utilizing fast growing wood processing residues and a preparation method thereof, wherein the fast growing wood processing residues are crushed and sieved, materials are fully mixed with a phosphoric acid solution, the materials are kneaded at 100 ~ 200 ℃ for no more than 90min, then the materials are placed in an oil pressure molding device and pressed into columnar granules with the diameter of 4mm, the extruded columnar granules are hardened for 2h at 140 ℃, the temperature is kept for 0.5 ~ 2h at 300 ~ 600 ℃ for carbon activation, the reaction is cooled to room temperature after the reaction is finished, distilled water is rinsed to the pH value of 5-6, and the activated carbon is obtained after drying.
Description
Technical Field
The invention belongs to the technical field of production and preparation of activated carbon materials, and particularly relates to a molded granular activated carbon prepared from fast growing wood processing residues and a preparation method thereof.
Background
The forest area of China is about 2.08 hundred million hectares, wherein the storage area of the artificial forest reaches 6933 million hectares and is at the first place in the world. The fast-growing forest is a main tree species in an artificial forest, the processing residues generated every year are about 7760 ten thousand tons, the utilization rate is low, and the economic value is not high.
The active carbon is an environment-friendly adsorption purification material, has a unique pore structure and surface functional groups, is stable in physicochemical property, has a large amount of applications in various fields such as environmental protection, food, medicine, energy storage, national defense and the like, and is an indispensable important product of national economy. The method for preparing the activated carbon by taking the forest processing residues as the raw materials has the advantages of simple activation process, adjustable and controllable product aperture, strong adsorption capacity, realization of comprehensive utilization of resources and higher economic and social benefits. Compared with the wood powder active carbon, the wood granular active carbon has larger shape and size, higher strength and bulk density, no dust pollution, great advantages in the processes of storage, transportation and use, and easy satisfaction of the purposes of different industries. Along with the improvement of the economy, science and technology and the living standard of people in China, the demand of products which can improve the living and working environment and are beneficial to the environmental health is increasingly large, the granular activated carbon overcomes the defects of the powdery activated carbon, and the granular activated carbon is more and more valued and applied in the field of adsorption and purification, especially in the field of VOCs adsorption, and has wide market prospect.
The conventional preparation of the molded granular activated carbon based on a physical method needs a binder, and has the problems of high production energy consumption, high cost, low yield, complex operation and high price; the chemical method for producing the granular activated carbon is beneficial to improving the product yield and reducing the energy consumption and the production cost, but the high adsorbability and the high strength of the granular activated carbon are often difficult to meet simultaneously.
Disclosure of Invention
The technical problem to be solved is as follows: the invention provides a molded granular activated carbon prepared from fast growing wood processing residues and a preparation method thereof. The proper pretreatment conditions (impregnation ratio, kneading time and kneading temperature) and the carbon activation process (temperature and time) are researched, tar generated in the pretreatment process is utilized to bond materials, no external binder is needed, and the production cost is reduced; the pretreatment makes the activating agent fully enter the materials, simultaneously promotes the materials to be fully bonded, and can simultaneously realize the high adsorption and the high strength of the granular activated carbon.
The technical scheme is as follows: the preparation method of the molded granular activated carbon prepared by utilizing the fast growing wood processing residues comprises the following steps: crushing and sieving fast growing wood processing residues, taking a material with the particle size of 0.2-1mm and the water content of 1-15 wt.% to fully mix with a phosphoric acid solution, wherein the mass ratio of the material to pure phosphoric acid is 1 (1.0-2.0), kneading at 100-200 ℃ for no more than 90min, then placing in an oil pressure forming device, pressing into columnar particles with the diameter of 4mm, hardening the extruded columnar particles at 140 ℃ for 2h, preserving heat at 300-600 ℃ for 0.5-2 h for carbon activation, cooling to room temperature after the reaction is finished, rinsing with distilled water until the pH value is 5-6, and drying to obtain the activated carbon.
The fast growing wood processing residues are cedar wood chips, poplar wood chips, phoenix tree wood chips, paulownia chips or Chinese red pine chips.
The dipping mass ratio of the materials to the phosphoric acid is 1 (1.0-1.5).
The pretreatment temperature is 150-180 ℃.
The kneading time is 50-65 min.
The carbon activation temperature is 450-550 ℃.
The carbon activation time is 1.0-1.5 h.
The active carbon prepared by the preparation method.
Has the advantages that: the preparation of the shaped granular activated carbon by pretreatment does not need an additional binder, the method is simple, and the cost is saved; the pretreatment makes the activating agent fully enter the material, which is beneficial to obtaining the activated carbon with high adsorption performance, the generated tar fully bonds the material, is beneficial to improving the strength of the formed granular activated carbon, and can simultaneously realize the high adsorption and the high strength of the formed granular activated carbon.
Detailed Description
To better illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following description is made by way of specific embodiments.
Example 1
20g of 0.5-1mm poplar chips, adjusting the water content to 5%, fully mixing the poplar chips and phosphoric acid according to the impregnation mass ratio of 1:1.0, kneading for 50min at 150 ℃, pressing into 4mm columnar particles in an oil pressure forming machine, hardening for 2h at 140 ℃, preserving heat for 1h at 450 ℃, cooling to room temperature after the reaction is finished, rinsing with distilled water until the pH value is 5-6, and drying to obtain the activated carbon, which is marked as AC 1.
Example 2
20g of 0.5-1mm poplar chips, adjusting the water content to 5%, fully mixing the poplar chips and phosphoric acid according to the impregnation mass ratio of 1:1.5, kneading for 50min at 150 ℃, pressing into 4mm columnar particles in an oil pressure forming machine, hardening for 2h at 140 ℃, preserving heat for 1h at 450 ℃, cooling to room temperature after the reaction is finished, rinsing with distilled water until the pH value is 5-6, and drying to obtain the activated carbon, which is marked as AC 2.
Example 3
20g of 0.5-1mm poplar chips, adjusting the water content to 5%, fully mixing the poplar chips and phosphoric acid according to the impregnation mass ratio of 1:1.5, kneading for 50min at 180 ℃, pressing into 4mm columnar particles in an oil pressure forming machine, hardening for 2h at 140 ℃, preserving heat for 1h at 450 ℃, cooling to room temperature after the reaction is finished, rinsing with distilled water until the pH value is 5-6, and drying to obtain the activated carbon, which is marked as AC 3.
Example 4
20g of 0.5-1mm poplar chips, adjusting the water content to 5%, fully mixing the poplar chips and phosphoric acid according to the impregnation mass ratio of 1:1.5, kneading for 65min at 150 ℃, pressing into 4mm columnar particles in an oil pressure forming machine, hardening for 2h at 140 ℃, preserving heat for 1h at 450 ℃, cooling to room temperature after the reaction is finished, rinsing with distilled water until the pH value is 5-6, and drying to obtain the activated carbon, which is marked as AC 4.
Example 5
20g of 0.5-1mm poplar chips, adjusting the water content to 5%, fully mixing the poplar chips and phosphoric acid according to the impregnation mass ratio of 1:1.5, kneading for 65min at 150 ℃, pressing into 4mm columnar particles in an oil pressure forming machine, hardening for 2h at 140 ℃, preserving heat for 1h at 550 ℃, cooling to room temperature after the reaction is finished, rinsing with distilled water until the pH value is 5-6, and drying to obtain the activated carbon, which is marked as AC 5.
Example 6
20g of 0.5-1mm poplar chips, adjusting the water content to 5%, fully mixing the poplar chips and phosphoric acid according to the impregnation mass ratio of 1:1.5, kneading for 65min at 150 ℃, pressing into 4mm columnar particles in an oil pressure forming machine, hardening for 2h at 140 ℃, preserving heat for 1.5h at 450 ℃, cooling to room temperature after the reaction is finished, rinsing with distilled water until the pH value is 5-6, and drying to obtain the activated carbon, which is marked as AC 6.
TABLE 1 comparison of adsorption Performance and Strength of the activated carbon obtained in each example
Table 1 shows the adsorption properties and wall-sticking properties of the activated carbons obtained in examples 1 to 6. As shown in the table, the columnar formed granular activated carbon with high adsorption performance and strength can be obtained by the pretreatment of phosphoric acid dipping and kneading without adding a binder and by controlling the pretreatment condition and the carbon activation condition.
The above-mentioned embodiments are described in detail for the purpose of illustrating the invention, and it is to be understood that the invention is not limited to the above-mentioned preferred embodiments, and that various changes and modifications can be made by those skilled in the art without departing from the scope of the invention.
Claims (8)
1. A preparation method of molded granular activated carbon prepared from fast growing wood processing residues is characterized by comprising the steps of crushing and sieving the fast growing wood processing residues, fully mixing materials with the particle size of 0.2-1mm and the water content of 1 wt.% ~ 15 wt.% with phosphoric acid solution, wherein the mass ratio of the materials to pure phosphoric acid is 1 (1.0 ~ 2.0.0), kneading the materials at 100 ~ 200 ℃ for no more than 90min, then placing the materials in an oil pressure molding device, pressing the materials into columnar granules with the diameter of 4mm, hardening the extruded columnar granules at 140 ℃ for 2h, preserving the heat at 300 ~ 600 ℃ for 0.5 ~ 2h for carbon activation, cooling the granules to room temperature after reaction is finished, rinsing the granules with distilled water until the pH value is 5-6, and drying the granules to obtain the activated carbon.
2. The method of preparing a shaped granular activated carbon using fast growing wood processing residues according to claim 1, wherein the fast growing wood processing residues are cedar wood chips, poplar wood chips, phoenix tree wood chips, paulownia chips or masson pine chips.
3. The method for preparing the shaped granular activated carbon using the fast growing wood processing residues as claimed in claim 1, wherein the impregnation mass ratio of the material to the phosphoric acid is 1 (1.0 ~ 1.5.5).
4. The method of claim 1, wherein the pre-treatment temperature is 150 ~ 180 ℃.
5. The method for preparing a shaped granular activated carbon using fast growing wood processing residues as claimed in claim 1, wherein the kneading time is 50 ~ 65 min.
6. The method of claim 1, wherein the activated carbon is activated at a temperature of 450 ~ 550 ℃ in the form of shaped particles.
7. The method of claim 1, wherein the activation time is 1.0 ~ 1.5.5 hours.
8. Activated carbon produced by the production method according to any one of claims 1 to 7.
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| US20040147397A1 (en) * | 2002-02-26 | 2004-07-29 | Miller Jan D. | Magnetic activated carbon particles for adsorption of solutes from solution |
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| CN104445183A (en) * | 2014-11-28 | 2015-03-25 | 浙江省林业科学研究院 | Method and technology for preparing light regeneration type mesoporous granular active carbon from woody powdery raw materials |
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| CN104445183A (en) * | 2014-11-28 | 2015-03-25 | 浙江省林业科学研究院 | Method and technology for preparing light regeneration type mesoporous granular active carbon from woody powdery raw materials |
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