CN113501517A - Preparation method of activated carbon applied to fresh air system - Google Patents
Preparation method of activated carbon applied to fresh air system Download PDFInfo
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- CN113501517A CN113501517A CN202110876595.7A CN202110876595A CN113501517A CN 113501517 A CN113501517 A CN 113501517A CN 202110876595 A CN202110876595 A CN 202110876595A CN 113501517 A CN113501517 A CN 113501517A
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- C01—INORGANIC CHEMISTRY
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- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
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- C01B32/318—Preparation characterised by the starting materials
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
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Abstract
The invention discloses a preparation method of activated carbon applied to a fresh air system, which comprises the following steps: the method comprises the following steps: selecting coal with ash content lower than 5% as raw material coal, and mixing hard broad-leaved wood, soft broad-leaved wood and coniferous wood according to the weight ratio of 3: 2: 5 preparing raw material scraps by batching, layering the raw material scraps to form a layer with the thickness of 3-5 cm, and drying the layer by hot air; the temperature of hot air is 38-42 ℃, the drying time is 36-48 hours, the sawdust is dried and crushed, the sawdust is put into a crucible, and an activator phosphoric acid and an auxiliary activator concentrated sulfuric acid are added and continuously stirred; step two: mixing the dried raw material scraps with a zinc chloride solution as an activating agent; the active carbon prepared by using the two different types of leaf materials as the raw material scraps has the adsorption capacity increased by 60-65% compared with the adsorption capacity of a product prepared by using a common single leaf material.
Description
Technical Field
The invention belongs to the technical field of activated carbon preparation, and particularly relates to a preparation method of activated carbon applied to a fresh air system.
Background
Activated carbon production generally employs plants as raw materials for the production of activated carbon, and for the general process of activated carbon production generally comprises: drying, carbonizing and activating, wherein the corresponding active carbon production equipment comprises a dry drying device (a drying section), a carbonizing device (a carbonizing section) and an activating device (an activating section). The materials enter from the inlet of the drying device, pass through the carbonization device and the activation device to obtain the activated carbon, the hot air enters from the hot air inlet of the activation device, passes through the carbonization device and the drying device in sequence, and is discharged from the air outlet of the drying device after being fully contacted with the materials in the devices, so as to respectively realize activation, carbonization and drying. In the production method using the plant activated carbon raw material, when the dried raw material is introduced into a carbonization device for carbonization, fuel and air are generally introduced from the outside for combustion to achieve carbonization of the raw material. In order to ensure that the fuel can be fully combusted, more air needs to be introduced, and the temperature of hot air introduced into the carbonization device can be greatly reduced by introducing more air, so that the requirement of the carbonization device on higher temperature cannot be met;
the preparation method of the activated carbon can be divided into a chemical method, a physical method, a physicochemical method and the like, and the adsorption of the activated carbon is between an adsorbent and an adsorbate. The physical activation method uses carbon as raw material and uses steam, carbon dioxide, oxygen or their mixture as activation medium, and under the condition of high temp. the carbon atoms are partially gasified to form new pore channel, and its volatile component is less. The ash content of the carbide of the activated carbon raw material is an important index for selecting the activated carbon raw material, the ash content is about 10 times of the ash content of the raw material, and the higher the ash content of the activated carbon is, the lower the adsorption capacity is. Therefore, when selecting the activated carbon raw material, the raw material having a low ash content should be selected as much as possible.
Disclosure of Invention
The invention aims to provide a preparation method of activated carbon applied to a fresh air system, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of activated carbon applied to a fresh air system comprises the following steps:
the method comprises the following steps: selecting coal with ash content lower than 5% as raw material coal, and mixing hard broad-leaved wood, soft broad-leaved wood and coniferous wood according to the weight ratio of 3: 2: 5 preparing raw material scraps by batching, layering the raw material scraps to form a layer with the thickness of 3-5 cm, and drying the layer by hot air; wherein the temperature of hot air is 38-42 ℃, the drying time is 36-48 hours, the sawdust is dried and crushed, the sawdust is put into a crucible, and an activator phosphoric acid and an auxiliary activator concentrated sulfuric acid are added and continuously stirred;
step two: mixing the zinc chloride solution serving as an activating agent with the dried raw material scraps, and stirring by using a stirrer to form a primary material; wherein the baume degree of the zinc chloride solution is 60-64 DEG Be/60 ℃, and the pH value is 2.8-3.0; stirring for 20-30 minutes; the mixing ratio of the zinc chloride solution to the raw material scraps is 4.8-5.0: 1, soaking the sawdust in an activating agent phosphoric acid and an auxiliary activating agent concentrated sulfuric acid for 15-30 hours, and feeding the sawdust and a crucible into a muffle furnace for carbonization and activation;
step three: carbonizing the primary material at 120-200 ℃; continuously heating and activating, wherein the activation temperature is 520-550 ℃, the heating is constant temperature during activation, and the heating speed is 10 ℃/min, so as to prepare an activated carbon initial sample;
step four: adding industrial hydrochloric acid, separating zinc chloride in an active carbon initial sample by using a filtering and extracting device, washing with water, and drying with cold air to obtain the active carbon;
step five: carbonizing and activating the raw material coal to obtain primary activated carbon with the specific surface area of 500-1000 m 2/g; grinding the primary activated carbon to be below 100 meshes, soaking the primary activated carbon in hydrofluoric acid, and washing the primary activated carbon to be neutral; heating under the protection of inert gas; reacting the material obtained by heating in the step S4 with potassium hydroxide according to the mass ratio of 1 (1-6);
step six: washing the cooled activated carbon with hydrochloric acid to neutrality, adjusting the pH to 7, filtering with distilled water, and recovering the filtrate; and after filtering, drying the filter residue, fully grinding, and sieving by a 200-mesh sieve to obtain the active carbon.
Preferably, in the first step, the particle size of the raw material scraps is less than 35-38 meshes, in the first step, the hard broad-leaved wood is cyclobalanopsis glauca or quercus acutissima, the soft broad-leaved wood is poplar or willow, and the coniferous wood is masson pine.
Preferably, in the second step, the baume degree of the zinc chloride solution is 62 ° B/60 ℃, the pH value is 3.0, and in the second step, the mixing ratio of the zinc chloride solution to the raw material chips is 5: 1.
preferably, the cold air drying time in the fourth step is 24-36 hours.
Preferably, in the fifth step, the raw material coal is subjected to carbonization and activation treatment by a steam activation method, a phosphoric acid activation method or an alkali activation method; stirring and soaking the mixture for 6 to 72 hours at 40 to 70 ℃ by hydrofluoric acid, and then washing the mixture to be neutral; the concentration of hydrofluoric acid is 5-25%, under the protection of inert gas, the temperature is raised to 1500-2200 ℃ at the temperature rise speed of (2-10 ℃) per min, and the temperature is preserved for 0.5-2 hours; reacting the material obtained by treatment with potassium hydroxide under the condition of inert gas, wherein the reaction temperature is 700-900 ℃. The reaction is carried out for 0.5 to 5 hours.
Preferably, in the sixth step, the concentration of the activating agent phosphoric acid is 40%, the impregnation ratio is 1.5%, the time is 60min, and the temperature is 500 ℃; the concentration of the activating agent phosphoric acid is 50%, the impregnation ratio is 1.2%, the time is 90min, and the temperature is 550 ℃.
Preferably, the concentration of the activating agent phosphoric acid is 60%, the impregnation ratio is 2.5%, the time is 120min, and the temperature is 600 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the active carbon is an activating agent and the mixing proportion of the zinc chloride solution and the raw material scraps is controlled, the zinc chloride solution after use can separate and recycle the zinc chloride, the production cost is effectively reduced, the adsorption capacity of the active carbon prepared by taking the two different types of leaf materials as the raw material scraps is increased by 60-65% compared with that of the product prepared by taking the common single leaf material, and the adsorption performance of the prepared active carbon is effectively improved; good adsorption effect, low cost, industrial production and strong practicability.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a technical scheme that: a preparation method of activated carbon applied to a fresh air system comprises the following steps:
the method comprises the following steps: selecting coal with ash content lower than 5% as raw material coal, and mixing hard broad-leaved wood, soft broad-leaved wood and coniferous wood according to the weight ratio of 3: 2: 5 preparing raw material scraps by batching, layering the raw material scraps to form a layer with the thickness of 3cm, and drying the layer by hot air; wherein the temperature of the hot air is 38 ℃, the drying time is 36 hours, the wood chips are dried and crushed, the crushed wood chips are put into a crucible, and an activator phosphoric acid and an auxiliary activator concentrated sulfuric acid are added and continuously stirred;
step two: mixing the zinc chloride solution serving as an activating agent with the dried raw material scraps, and stirring by using a stirrer to form a primary material; wherein the baume degree of the zinc chloride solution is 60 DEG Be/60 ℃, and the pH value is 2.8-3.0; stirring for 20-30 minutes; the mixing ratio of the zinc chloride solution to the raw material scraps is 4.8-5.0: 1, wood chips are soaked in activating agent phosphoric acid and auxiliary activating agent concentrated sulfuric acid for 30 hours, and are sent into a muffle furnace together with a crucible for carbonization and activation;
step three: carbonizing the primary material at 200 ℃; continuously heating for activation, wherein the activation temperature is 520 ℃, the heating is constant temperature during activation, and the heating speed is 10 ℃/min, so as to prepare an activated carbon initial sample;
step four: adding industrial hydrochloric acid, separating zinc chloride in the active carbon primary sample by a filtering and extracting device, washing with water, and drying with cold air to obtain active carbon;
step five: carrying out carbonization and activation treatment on the raw material coal to obtain primary activated carbon with the specific surface area of 500m 2/g; grinding the primary activated carbon to be below 100 meshes, soaking the primary activated carbon in hydrofluoric acid, and washing the primary activated carbon to be neutral; heating under the protection of inert gas; reacting the material obtained by heating in the step S4 with potassium hydroxide according to the mass ratio of 1: 5;
step six: washing the cooled activated carbon with hydrochloric acid to neutrality, adjusting the pH to 7, filtering with distilled water, and recovering the filtrate; and after filtering, drying the filter residue, fully grinding, and sieving by a 200-mesh sieve to obtain the active carbon.
In this embodiment, preferably, in the first step, the particle size of the raw material chips is smaller than 38 meshes, and in the first step, the hard broad-leaved wood is cyclobalanopsis glauca or quercus acutissima, the soft broad-leaved wood is poplar or willow, and the coniferous wood is masson pine.
In this embodiment, preferably, in the second step, the baume degree of the zinc chloride solution is 62 ° be/60 ℃, the pH value is 3.0, and in the second step, the mixing ratio of the zinc chloride solution to the raw material chips is 5: 1.
in this embodiment, the cold air drying time in the fourth step is preferably 36 hours.
In this embodiment, preferably, in the fifth step, the raw material coal is subjected to carbonization activation treatment by a steam activation method, a phosphoric acid activation method, or an alkali activation method; stirring and soaking for 72 hours at 70 ℃ by using hydrofluoric acid, and then washing to be neutral; the concentration of hydrofluoric acid is 5%, under the protection of inert gas, the temperature is raised to 1500 ℃ at the temperature rising speed of 9 ℃/min, and the temperature is kept for 2 hours; the material obtained from the treatment was reacted with potassium hydroxide under inert gas conditions and at a reaction temperature of 700 ℃. The reaction is carried out for 0.5 to 5 hours.
In this embodiment, preferably, in the sixth step, the concentration of the activating agent phosphoric acid is 40%, the impregnation ratio is 1.5%, the time is 60min, and the temperature is 500 ℃; the concentration of the activating agent phosphoric acid is 50%, the impregnation ratio is 1.2%, the time is 90min, and the temperature is 550 ℃.
In this embodiment, the concentration of the activating agent phosphoric acid is preferably 60%, the impregnation ratio is preferably 2.5%, the time is preferably 120min, and the temperature is preferably 600 ℃.
Example 2
The invention provides a technical scheme that: a preparation method of activated carbon applied to a fresh air system comprises the following steps:
the method comprises the following steps: selecting coal with ash content lower than 5% as raw material coal, and mixing hard broad-leaved wood, soft broad-leaved wood and coniferous wood according to the weight ratio of 3: 2: 5 preparing raw material scraps by batching, layering the raw material scraps to form a layer with the thickness of 3cm, and drying the layer by hot air; wherein the temperature of the hot air is 42 ℃, the drying time is 48 hours, the sawdust is dried and crushed, the sawdust is put into a crucible, and the activating agent phosphoric acid and the auxiliary activating agent concentrated sulfuric acid are added and continuously stirred;
step two: mixing the zinc chloride solution serving as an activating agent with the dried raw material scraps, and stirring by using a stirrer to form a primary material; wherein the baume degree of the zinc chloride solution is 64 DEG Be/60 ℃, and the pH value is 2.8-3.0; the stirring time is 30 minutes; the mixing ratio of the zinc chloride solution to the raw material scraps is 4.8-5.0: 1, wood chips are soaked in activating agent phosphoric acid and auxiliary activating agent concentrated sulfuric acid for 30 hours, and are sent into a muffle furnace together with a crucible for carbonization and activation;
step three: carbonizing the primary material at 200 ℃; continuously heating for activation, wherein the activation temperature is 550 ℃, the heating is constant temperature during activation, and the heating speed is 10 ℃/min, so as to prepare an activated carbon initial sample;
step four: adding industrial hydrochloric acid, separating zinc chloride in the active carbon primary sample by a filtering and extracting device, washing with water, and drying with cold air to obtain active carbon;
step five: carrying out carbonization and activation treatment on the raw material coal to obtain primary activated carbon with the specific surface area of 1000m 2/g; grinding the primary activated carbon to be below 100 meshes, soaking the primary activated carbon in hydrofluoric acid, and washing the primary activated carbon to be neutral; heating under the protection of inert gas; reacting the material obtained by heating in the step S4 with potassium hydroxide according to the mass ratio of 1: 5;
step six: washing the cooled activated carbon with hydrochloric acid to neutrality, adjusting the pH to 7, filtering with distilled water, and recovering the filtrate; and after filtering, drying the filter residue, fully grinding, and sieving by a 200-mesh sieve to obtain the active carbon.
In this embodiment, preferably, in the first step, the particle size of the raw material chips is smaller than 38 meshes, and in the first step, the hard broad-leaved wood is cyclobalanopsis glauca or quercus acutissima, the soft broad-leaved wood is poplar or willow, and the coniferous wood is masson pine.
In this embodiment, preferably, in the second step, the baume degree of the zinc chloride solution is 62 ° be/60 ℃, the pH value is 3.0, and in the second step, the mixing ratio of the zinc chloride solution to the raw material chips is 5: 1.
in this embodiment, the cold air drying time in the fourth step is preferably 36 hours.
In this embodiment, preferably, in the fifth step, the raw material coal is subjected to carbonization activation treatment by a steam activation method, a phosphoric acid activation method, or an alkali activation method; stirring and soaking for 72 hours at 70 ℃ by using hydrofluoric acid, and then washing to be neutral; the concentration of hydrofluoric acid is 25%, under the protection of inert gas, the temperature is raised to 1500 ℃ at the temperature raising speed of 5 ℃/min, and the temperature is kept for 2 hours; the material obtained from the treatment was reacted with potassium hydroxide under inert gas conditions and at a reaction temperature of 900 ℃. The reaction was carried out for 0.5 hour.
In this embodiment, preferably, in the sixth step, the concentration of the activating agent phosphoric acid is 40%, the impregnation ratio is 1.5%, the time is 60min, and the temperature is 500 ℃; the concentration of the activating agent phosphoric acid is 50%, the impregnation ratio is 1.2%, the time is 90min, and the temperature is 550 ℃.
In this embodiment, the concentration of the activating agent phosphoric acid is preferably 60%, the impregnation ratio is preferably 2.5%, the time is preferably 120min, and the temperature is preferably 600 ℃.
Example 3
The invention provides a technical scheme that: a preparation method of activated carbon applied to a fresh air system comprises the following steps:
the method comprises the following steps: selecting coal with ash content lower than 5% as raw material coal, and mixing hard broad-leaved wood, soft broad-leaved wood and coniferous wood according to the weight ratio of 3: 2: 5 preparing raw material scraps by batching, layering the raw material scraps to form a layer with the thickness of 5cm, and drying the layer by hot air; wherein the temperature of the hot air is 42 ℃, the drying time is 48 hours, the sawdust is dried and crushed, the sawdust is put into a crucible, and the activating agent phosphoric acid and the auxiliary activating agent concentrated sulfuric acid are added and continuously stirred;
step two: mixing the zinc chloride solution serving as an activating agent with the dried raw material scraps, and stirring by using a stirrer to form a primary material; wherein the baume degree of the zinc chloride solution is 64 DEG Be/60 ℃, and the pH value is 3.0; the stirring time is 30 minutes; the mixing ratio of the zinc chloride solution to the raw material scraps is 4.8-5.0: 1, wood chips are soaked in an activating agent phosphoric acid and an auxiliary activating agent concentrated sulfuric acid for 15-30 hours, and are sent into a muffle furnace together with a crucible for carbonization and activation;
step three: carbonizing the primary material at 200 ℃; continuously heating for activation, wherein the activation temperature is 550 ℃, the heating is constant temperature during activation, and the heating speed is 10 ℃/min, so as to prepare an activated carbon initial sample;
step four: adding industrial hydrochloric acid, separating zinc chloride in the active carbon primary sample by a filtering and extracting device, washing with water, and drying with cold air to obtain active carbon;
step five: carrying out carbonization and activation treatment on the raw material coal to obtain primary activated carbon with the specific surface area of 1000m 2/g; grinding the primary activated carbon to be below 100 meshes, soaking the primary activated carbon in hydrofluoric acid, and washing the primary activated carbon to be neutral; heating under the protection of inert gas; reacting the material obtained by heating in the step S4 with potassium hydroxide according to the mass ratio of 1: 2;
step six: washing the cooled activated carbon with hydrochloric acid to neutrality, adjusting the pH to 7, filtering with distilled water, and recovering the filtrate; and after filtering, drying the filter residue, fully grinding, and sieving by a 200-mesh sieve to obtain the active carbon.
In this embodiment, preferably, in the first step, the particle size of the raw material chips is smaller than 38 meshes, and in the first step, the hard broad-leaved wood is cyclobalanopsis glauca or quercus acutissima, the soft broad-leaved wood is poplar or willow, and the coniferous wood is masson pine.
In this embodiment, preferably, in the second step, the baume degree of the zinc chloride solution is 62 ° be/60 ℃, the pH value is 3.0, and in the second step, the mixing ratio of the zinc chloride solution to the raw material chips is 5: 1.
in this embodiment, the cold air drying time in the fourth step is preferably 36 hours.
In this embodiment, preferably, in the fifth step, the raw material coal is subjected to carbonization activation treatment by a steam activation method, a phosphoric acid activation method, or an alkali activation method; stirring and soaking for 72 hours at 70 ℃ by using hydrofluoric acid, and then washing to be neutral; the concentration of hydrofluoric acid is 25%, under the protection of inert gas, the temperature is raised to 2200 ℃ at the temperature raising speed of 10 ℃/min, and the temperature is kept for 2 hours; the material obtained from the treatment was reacted with potassium hydroxide under inert gas conditions and at a reaction temperature of 900 ℃. The reaction was carried out for 5 hours.
In this embodiment, preferably, in the sixth step, the concentration of the activating agent phosphoric acid is 40%, the impregnation ratio is 1.5%, the time is 60min, and the temperature is 500 ℃; the concentration of the activating agent phosphoric acid is 50%, the impregnation ratio is 1.2%, the time is 90min, and the temperature is 550 ℃.
In this embodiment, the concentration of the activating agent phosphoric acid is preferably 60%, the impregnation ratio is preferably 2.5%, the time is preferably 120min, and the temperature is preferably 600 ℃.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A preparation method of activated carbon applied to a fresh air system is characterized by comprising the following steps: the preparation method of the activated carbon is characterized by comprising the following steps:
the method comprises the following steps: selecting coal with ash content lower than 5% as raw material coal, and mixing hard broad-leaved wood, soft broad-leaved wood and coniferous wood according to the weight ratio of 3: 2: 5 preparing raw material scraps by batching, layering the raw material scraps to form a layer with the thickness of 3-5 cm, and drying the layer by hot air; wherein the temperature of hot air is 38-42 ℃, the drying time is 36-48 hours, the sawdust is dried and crushed, the sawdust is put into a crucible, and an activator phosphoric acid and an auxiliary activator concentrated sulfuric acid are added and continuously stirred;
step two: mixing the zinc chloride solution serving as an activating agent with the dried raw material scraps, and stirring by using a stirrer to form a primary material; wherein the baume degree of the zinc chloride solution is 60-64 DEG Be/60 ℃, and the pH value is 2.8-3.0; stirring for 20-30 minutes; the mixing ratio of the zinc chloride solution to the raw material scraps is 4.8-5.0: 1, soaking the sawdust in an activating agent phosphoric acid and an auxiliary activating agent concentrated sulfuric acid for 15-30 hours, and feeding the sawdust and a crucible into a muffle furnace for carbonization and activation;
step three: carbonizing the primary material at 120-200 ℃; continuously heating and activating, wherein the activation temperature is 520-550 ℃, the heating is constant temperature during activation, and the heating speed is 10 ℃/min, so as to prepare an activated carbon initial sample;
step four: adding industrial hydrochloric acid, separating zinc chloride in an active carbon initial sample by using a filtering and extracting device, washing with water, and drying with cold air to obtain the active carbon;
step five: carbonizing and activating the raw material coal to obtain primary activated carbon with the specific surface area of 500-1000 m 2/g; grinding the primary activated carbon to be below 100 meshes, soaking the primary activated carbon in hydrofluoric acid, and washing the primary activated carbon to be neutral; heating under the protection of inert gas; reacting the material obtained by heating in the step S4 with potassium hydroxide according to the mass ratio of 1 (1-6);
step six: washing the cooled activated carbon with hydrochloric acid to neutrality, adjusting the pH to 7, filtering with distilled water, and recovering the filtrate; and after filtering, drying the filter residue, fully grinding, and sieving by a 200-mesh sieve to obtain the active carbon.
2. The method for preparing the activated carbon applied to the fresh air system according to claim 1, wherein the method comprises the following steps: in the first step, the particle size of the raw material scraps is smaller than 35-38 meshes, in the first step, the hard broad-leaved wood is cyclobalanopsis glauca or quercus acutissima, the soft broad-leaved wood is poplar or willow, and the coniferous wood is masson pine.
3. The method for preparing the activated carbon applied to the fresh air system according to claim 1, wherein the method comprises the following steps: in the second step, the Baume degree of the zinc chloride solution is 62 DEG Be/60 ℃, the pH value is 3.0, and in the second step, the mixing ratio of the zinc chloride solution to the raw material chips is 5: 1.
4. the method for preparing the activated carbon applied to the fresh air system according to claim 1, wherein the method comprises the following steps: and in the fourth step, the cold air drying time is 24-36 hours.
5. The method for preparing the activated carbon applied to the fresh air system according to claim 1, wherein the method comprises the following steps: in the fifth step, the raw material coal is subjected to carbonization and activation treatment by adopting a steam activation method, a phosphoric acid activation method or an alkali activation method; stirring and soaking the mixture for 6 to 72 hours at 40 to 70 ℃ by hydrofluoric acid, and then washing the mixture to be neutral; the concentration of hydrofluoric acid is 5-25%, under the protection of inert gas, the temperature is raised to 1500-2200 ℃ at the temperature rise speed of (2-10 ℃) per min, and the temperature is preserved for 0.5-2 hours; reacting the material obtained by treatment with potassium hydroxide under the condition of inert gas, wherein the reaction temperature is 700-900 ℃. The reaction is carried out for 0.5 to 5 hours.
6. The method for preparing the activated carbon applied to the fresh air system according to claim 1, wherein the method comprises the following steps: in the sixth step, the concentration of the activating agent phosphoric acid is 40%, the impregnation ratio is 1.5%, the time is 60min, and the temperature is 500 ℃; the concentration of the activating agent phosphoric acid is 50%, the impregnation ratio is 1.2%, the time is 90min, and the temperature is 550 ℃.
7. The method for preparing the activated carbon applied to the fresh air system according to claim 6, wherein the method comprises the following steps: the concentration of the activating agent phosphoric acid is 60%, the impregnation ratio is 2.5%, the time is 120min, and the temperature is 600 ℃.
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| GB499956A (en) * | 1936-05-09 | 1939-01-26 | Ig Farbenindustrie Ag | Process for the manufacture of shaped activated carbons |
| CH589007A5 (en) * | 1973-05-04 | 1977-06-30 | Boehlen Bruno | Active carbon prodn. from organic polymers - by carbonisation in presence of zinc chloride |
| CN103663449A (en) * | 2013-12-13 | 2014-03-26 | 瓮福（集团）有限责任公司 | Method for preparing activated carbon from wet-process purified phosphoric acid and sulfuric acid |
| CN105060290A (en) * | 2015-07-16 | 2015-11-18 | 陕西煤业化工技术研究院有限责任公司 | Preparation method of coal-based activated carbon with low ash and high specific surface area |
| EP3285272A1 (en) * | 2016-08-19 | 2018-02-21 | Farad Power, Inc. | A method for making activated nano-porous carbon |
| CN106395819A (en) * | 2016-12-08 | 2017-02-15 | 陕西易阳科技有限公司 | Preparation method of saw-dust activated carbon |
| CN110697711A (en) * | 2019-11-29 | 2020-01-17 | 湖南省格林森炭业股份有限公司 | Preparation method of activated carbon |
| CN110790272A (en) * | 2019-11-29 | 2020-02-14 | 湖南省格林森炭业股份有限公司 | Preparation method of activated carbon |
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