CN107235489A - A kind of preparation method of high-specific surface area Alveolate activated carbon - Google Patents
A kind of preparation method of high-specific surface area Alveolate activated carbon Download PDFInfo
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Abstract
The present invention discloses a kind of preparation method of high-specific surface area Alveolate activated carbon, including：1) by more than discarded powdered activated carbon crushing grinding to 100 mesh, according to mass ratio 1：The discarded powdered activated carbon of 0.5~3 mixing and coal tar, refine 1~3h in kneader at a temperature of 60 150 DEG C, plastifying material are made；2) plastifying material is extruded in ceramic honey comb tube extruding machine, extrusion forming obtains honeycomb idiosome in honeycomb die；3) the honeycomb idiosome of shaping is put into drying box, 12~72h is dried under the conditions of 80~110 DEG C, honeycomb idiosome is taken out in then cooling；4) by dried honeycomb idiosome in retort, carbonized at 600~900 DEG C, carbonized material is taken out in cooling；5) honeycomb carbonized material is placed in activation furnace, Alveolate activated carbon is made in 1~2h of steam activation at 800~1000 DEG C.Alveolate activated carbon prepared by the present invention has that intensity is big, specific surface area is high, adsorption capacity is high, the pressure loss is small, acid-fast alkali-proof the features such as, while realizing the purpose that discarded powdered activated carbon recycling is recycled.
Description
Technical field
The invention belongs to cellular activated carbon technical field, it is related to a kind of preparation method of high-specific surface area cellular activated carbon,
Relate in particular to a kind of side that Alveolate activated carbon is prepared into using discarded powdered activated carbon and coal tar mixing extrusion forming
Method.
Background technology
Alveolate activated carbon is the NEW TYPE OF COMPOSITE functional activity charcoal that a class endo conformation has many parallel channels, and they are not only
The advantages of comprising conventional carbon specific surface area height, controllable pore structure, acid and alkali-resistance, and have the honeycomb of uniqueness, also have
Have the advantages that percent opening is high, geometrical surface bigger, diffusion path is short, wear-resistant, anti-dust pollution ability is strong.With it is traditional activated
Charcoal is compared, and Alveolate activated carbon biggest advantage is that its pressure loss is small, under the same conditions, and its general resistance is only tradition
1/10 or so of activated carbon.Based on above advantage, Alveolate activated carbon is mainly used in desulphurization denitration, catalyst carrier, purification
In terms of organic exhaust gas.
At present, preparing the method for Alveolate activated carbon has the following two kinds：The integral extrusion method of forming and painting load method.Tu Zaifa is
Using ceramic honey comb as carrier, the liquid of carbonaceous material is coated on its surface, honeybee is prepared by processes such as drying, charing, activation
Nest shaped activated carbon.United States Patent (USP) US3825460 discloses a kind of method for preparing Alveolate activated carbon using painting load method.For with
The carbonaceous material of liquid processed is carbon black, natural or electrographite, coke blacking, coal dust etc., and carbohydrate, synthetic resin, fiber etc.
Organic matter.Obtained Alveolate activated carbon intensity is high in this way.But limited by Extruded Monolithic Celluar Ceramics porosity, Tu Zaifa
The ceramic structure that Alveolate activated carbon is made is higher containing porosity, but carbon content and specific surface area are relatively low.In addition, coating shedding can be made
The reduction of Viability Carbon Materials, while the carbon plate come off will also result in the damage of equipment.
The integral extrusion method of forming is to prepare a kind of the most frequently used method of shaping Alveolate activated carbon both at home and abroad at present.This side
Method is, by mould extrusion forming, then to dry formed body at a certain temperature after mixing carbonaceous material and adhesive, Gu
Change makes block structure stable, is finally carbonized, activated.Disclosed in Chinese invention patent CN200410092429.4 with coal dust
For carbon matrix precursor, the preparation method of the Alveolate activated carbon of binding agent is used as using coal tar and methylcellulose etc..Prepared
Alveolate activated carbon specific surface area and total pore volume can reach 1040m2/ g and 0.86mL/g, due to needing to add methylcellulose
Considerably increase manufacturing cost.Chinese invention patent CN200910079495.0 discloses one kind using coal dust as raw material, high-temperature coal
Tar is binding agent, the method that Alveolate activated carbon is prepared by extrusion under vacuum.Under high temperature inert gas protection,
After 700~800 DEG C of 1~2h of charing, 1~3h of steam activation is passed through at 700~900 DEG C, specific surface area and total pore volume is prepared
Respectively 657m2/ g and 0.352mL/g Alveolate activated carbon, but specific surface area is relatively low, and pore structure is less flourishing.
The content of the invention
Goal of the invention：For the deficiencies in the prior art, it is an object of the invention to provide a kind of high-specific surface area honeybee
The method of nest shaped activated carbon, only using discarded powdered activated carbon as raw material, Alveolate activated carbon is prepared using the integral extrusion method of forming,
Prepare that specific surface area is high, pore structure hair significantly, good adsorption performance and the higher and cheap cellular movable forming of intensity
Property charcoal.
Technical scheme：In order to realize foregoing invention purpose, the technical solution adopted by the present invention is：
A kind of high-specific surface area Alveolate activated carbon preparation method, comprises the following steps：
1) by more than discarded powdered activated carbon crushing grinding to 100 mesh, according to mass ratio 1：(1~3) discarded powdery is mixed
Activated carbon and coal tar, plastifying material is refined at a temperature of 60-150 DEG C in kneader；
2) plastifying material is extruded in ceramic honey comb tube extruding machine, extrusion forming obtains honeycomb embryo in honeycomb die
Body；
3) the honeycomb idiosome of shaping is put into drying box, 12~72h is dried under the conditions of 80~110 DEG C, then
Honeycomb idiosome is taken out in cooling；
4) by dried honeycomb idiosome in retort, carbonized at 600~850 DEG C, carbonized material is taken out in cooling；
5) honeycomb carbonized material is placed in activation furnace, 1~2h of steam activation at 800~950 DEG C is prepared cellular
Activated carbon.
Step 1) in, described discarded powdered activated carbon comes from：Industrial wastewater and the used discarded powdery of upper water process
Activated carbon, or the discarded powdered activated carbon that the decolouring of Sugarcane juice decolorization, food is produced, or Physical discard powdered activated carbon, or chemistry
Method discards powdered activated carbon.Described chemical method is discarded powdered activated including phosphoric acid activation, zinc chloride activation or steam activation
The discarded powdered activated carbon obtained after being applied Deng powdered activated carbon made from chemical activation method through liquid phase adsorption.Described Physical
It is discarded powdered activated that discarded powdered activated carbon is obtained after being applied for powdered activated carbon made from physical activation method through liquid phase adsorption
Charcoal.
Step 1) in, described coal tar is selected from high temperature coal-tar, one kind of medium temperature coal tar and coalite tar or several
Kind.
Step 2) in, extrusion molding pressure is 5~15MPa.
Step 2) in, honeycomb die is 5~10 holes/cm2Stainless steel mould.
Step 4) in, retort is Tunnel-type carbonization furnace or vertical retort.
Step 4) in, carbonization temperature is 800~850 DEG C
Step 5) in, activation furnace is rotary activated furnace or tunnel type activation furnace.
Step 5) in, activation temperature is 850~950 DEG C.
Beneficial effect：Compared with prior art, the present invention has advantages below：
1) Alveolate activated carbon prepared has the remarkable advantages such as high adsorption capacity, specific surface area height；
2) Alveolate activated carbon prepared has the characteristics of intensity is high；
3) Alveolate activated carbon is prepared using discarded powdered activated carbon as raw material, can not only lowers production cost, Er Qieke
Used with the circular regeneration for realizing discarded powdered activated carbon, reduce and waste and pollute；
4) integral extrusion moulding process is easy to operate, and technological process is simple, is easy to implement industrialization development.
Embodiment
With reference to specific embodiment, the present invention is described in detail.
Embodiment 1
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 100 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and high temperature coal-tar：2.0, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In at 100 DEG C refine, plastifying material is made；Then extruded in ceramic honey comb tube extruding machine, in 10MPa in honeycomb die
Extrusion forming obtains honeycomb idiosome under pressure；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；After drying
Honeycomb idiosome in Tunnel-type carbonization furnace, at 600 DEG C carbonize more than 5h, finally by the honeycomb ceramics of charing tunnel type activate
In stove, 2h is activated at 850 DEG C, Alveolate activated carbon is prepared.Its performance is as shown in table 1.
Embodiment 2
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 100 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and coalite tar：2.0, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In refine into plastifying material at 100 DEG C；Then extruded, pressed in honeycomb die in 10MPa in ceramic honey comb tube extruding machine
Extrusion forming obtains honeycomb idiosome under power；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；Will be dried
Honeycomb idiosome carbonizes more than 5h, finally by the honeycomb ceramics of charing in tunnel type activation furnace in Tunnel-type carbonization furnace at 600 DEG C
In, 2h is activated at 850 DEG C, Alveolate activated carbon is prepared.Its performance is as shown in table 1.
Embodiment 3
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 200 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and high temperature coal-tar：2.0, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In 100 DEG C refine 2h plastified；Then extruded in ceramic honey comb tube extruding machine, extrusion forming is obtained in honeycomb die
Honeycomb idiosome；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb idiosome in tunnel type
In retort, more than 5h is carbonized at 800 DEG C, finally by the honeycomb ceramics of charing in tunnel type activation furnace, is activated at 850 DEG C
2h, prepares Alveolate activated carbon.Its performance is as shown in table 1.
Embodiment 4
More than discarded powdered activated carbon crushing grinding to 200 mesh produced by the water treatment procedure that Physical is activated, press
According to the mass ratio 1 of discarded powdered activated carbon and high temperature coal-tar：1.5, discarded powdered activated carbon is mixed with binding agent coal tar,
And plastified in kneader in 100 DEG C of refining 2h；Then extruded, squeezed in honeycomb die in ceramic honey comb tube extruding machine
It is molded to obtain honeycomb idiosome；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb embryo
Body carbonizes more than 5h in Tunnel-type carbonization furnace at 800 DEG C, finally by the honeycomb ceramics of charing in tunnel type activation furnace,
2h is activated at 850 DEG C, Alveolate activated carbon is prepared.Its performance is as shown in table 1.
Embodiment 5
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 200 mesh, uses high temperature coal tar
The mass ratio of oil and medium temperature coal tar is 1：1 coal tar prepared is as binding agent, according to discarded powdered activated carbon and bonding
The mass ratio 1 of agent：2.0, discarded powdered activated carbon is mixed with binding agent, and 2h is refined at 100 DEG C in kneader and is moulded
Change；Then extruded in ceramic honey comb tube extruding machine, extrusion forming obtains honeycomb idiosome in honeycomb die；Honeycomb idiosome is existed
In drying box, more than 24h is dried at 80 DEG C；By dried honeycomb idiosome in Tunnel-type carbonization furnace, carbonized at 800 DEG C
More than 5h, finally by the honeycomb ceramics of charing in tunnel type activation furnace, 2h is activated at 850 DEG C, cellular activity is prepared
Charcoal.Its performance is as shown in table 1.
Embodiment 6
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 200 mesh, uses high temperature coal tar
The mass ratio of oil, medium temperature coal tar and coalite tar is 1：1：1 coal tar prepared is as binding agent, according to discarded powdery
The mass ratio 1 of activated carbon and binding agent：2.0, discarded powdered activated carbon is mixed with binding agent, and at 100 DEG C in kneader
Refining 2h is plastified；Then extruded in ceramic honey comb tube extruding machine, extrusion forming obtains honeycomb idiosome in honeycomb die；
By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb idiosome in Tunnel-type carbonization furnace,
More than 5h is carbonized at 800 DEG C, finally by the honeycomb ceramics of charing in tunnel type activation furnace, 2h is activated at 850 DEG C, is prepared into
To Alveolate activated carbon.Its performance is as shown in table 1.
Embodiment 7
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 200 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and high temperature coal-tar：3.0, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In 100 DEG C refine 2h plastified；Then extruded in ceramic honey comb tube extruding machine, extrusion forming is obtained in honeycomb die
Honeycomb idiosome；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb idiosome in tunnel type
In retort, more than 5h is carbonized at 800 DEG C, finally by the honeycomb ceramics of charing in tunnel type activation furnace, is activated at 850 DEG C
2h, prepares Alveolate activated carbon.Its performance is as shown in table 1.
Embodiment 8
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 200 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and high temperature coal-tar：2.0, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In 100 DEG C refine 2h plastified；Then extruded in ceramic honey comb tube extruding machine, extrusion forming is obtained in honeycomb die
Honeycomb idiosome；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb idiosome in tunnel type
In retort, more than 5h is carbonized at 850 DEG C, finally by the honeycomb ceramics of charing in tunnel type activation furnace, is activated at 900 DEG C
2h, prepares Alveolate activated carbon.Its performance is as shown in table 1.
Embodiment 9
The Physical that wastewater treatment is produced is discarded more than powdered activated carbon crushing grinding to 100 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and high temperature coal-tar：2.5, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In 100 DEG C refine 2h plastified；Then extruded in ceramic honey comb tube extruding machine, extrusion forming is obtained in honeycomb die
Honeycomb idiosome；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb idiosome in tunnel type
In retort, more than 5h is carbonized at 800 DEG C, finally by the honeycomb ceramics of charing in tunnel type activation furnace, is activated at 850 DEG C
2h, prepares Alveolate activated carbon.Its performance is as shown in table 1.
Embodiment 10
The Physical that wastewater treatment is produced is discarded more than powdered activated carbon crushing grinding to 200 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and high temperature coal-tar：2.0, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In 100 DEG C refine 2h plastified；Then extruded in ceramic honey comb tube extruding machine, in honeycomb die under 5MPa pressure
Extrusion forming obtains honeycomb idiosome；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb
Idiosome carbonizes more than 5h in Tunnel-type carbonization furnace at 800 DEG C, finally by the honeycomb ceramics of charing in rotary activated furnace,
2h is activated at 850 DEG C, Alveolate activated carbon is prepared.Its performance is as shown in table 1.
Embodiment 11
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 200 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and high temperature coal-tar：3.0, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In 150 DEG C refine 2h plastified；Then extruded in ceramic honey comb tube extruding machine, extrusion forming is obtained in honeycomb die
Honeycomb idiosome；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb idiosome in tunnel type
In retort, more than 5h is carbonized at 800 DEG C, finally by the honeycomb ceramics of charing in tunnel type activation furnace, is activated at 850 DEG C
2h, prepares Alveolate activated carbon.Its performance is as shown in table 1.
Embodiment 12
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 200 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and high temperature coal-tar：2.0, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In 60 DEG C refine 5h plastified；Then extruded in ceramic honey comb tube extruding machine, in honeycomb die under 15MPa pressure
Extrusion forming obtains honeycomb idiosome；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb
Idiosome carbonizes more than 5h in Tunnel-type carbonization furnace at 800 DEG C, finally by the honeycomb ceramics of charing in tunnel type activation furnace,
2h is activated at 850 DEG C, Alveolate activated carbon is prepared.Its performance is as shown in table 1.
Embodiment 13
The chemical method that Sugarcane juice decolorization is produced is discarded more than powdered activated carbon crushing grinding to 200 mesh, according to discarded powdery
The mass ratio 1 of activated carbon and high temperature coal-tar：2.0, discarded powdered activated carbon is mixed with binding agent coal tar, and in kneader
In 60 DEG C refine 5h plastified；Then extruded in ceramic honey comb tube extruding machine, extrusion forming is obtained in honeycomb die
Honeycomb idiosome；By honeycomb idiosome in drying box, more than 24h is dried at 80 DEG C；By dried honeycomb idiosome in tunnel type
In retort, more than 5h is carbonized at 800 DEG C, finally by the honeycomb ceramics of charing in tunnel type activation furnace, is activated at 950 DEG C
2h, prepares Alveolate activated carbon.Its performance is as shown in table 1.
The properties of product of above-mentioned Alveolate activated carbon according to using activated carbon standard GB/T/T12496.8-1999,
Method described in GB/T12496.10-1999 tests the iodine sorption value and methylene blue adsorption value of Alveolate activated carbon, using honeybee
Method described in standard GB/T/T25994-2010 of nest ceramics tests the intensity of Alveolate activated carbon.With nitrogen adsorption etc.
Warm collimation method analyzes the BET specific surface area and specific pore volume product of material.
The Alveolate activated carbon performance list of table 1
Claims (8)
1. a kind of high-specific surface area Alveolate activated carbon preparation method, it is characterised in that comprise the following steps：
1) by more than discarded powdered activated carbon crushing grinding to 100 mesh, according to mass ratio 1：(1~3) mix discarded powdered activated
Charcoal and coal tar, are refined in kneader at a temperature of 60-150 DEG C, plastifying material are made；
2) plastifying material is extruded in ceramic honey comb tube extruding machine, extrusion forming obtains honeycomb idiosome in honeycomb die；
3) the honeycomb idiosome of shaping is put into drying box to be dried and obtains honeycomb idiosome；
4) by dried honeycomb idiosome in retort, carbonized at 600~850 DEG C, carbonized material is taken out in cooling；
5) honeycomb carbonized material is placed in activation furnace, 1~2h of steam activation at 800~950 DEG C prepares cellular activity
Charcoal.
2. high-specific surface area Alveolate activated carbon preparation method according to claim 1, it is characterised in that：Step 1) in,
Described discarded powdered activated carbon comes from：Industrial wastewater and the used discarded powdered activated carbon of upper water process, or Sugarcane juice decolorization,
The discarded powdered activated carbon that food decolouring is produced, or Physical discard powdered activated carbon, or chemical method discards powdered activated carbon.
3. high-specific surface area Alveolate activated carbon preparation method according to claim 1, it is characterised in that：Step 1) in,
Described coal tar is selected from the one or more of high temperature coal-tar, medium temperature coal tar and coalite tar.
4. high-specific surface area Alveolate activated carbon preparation method according to claim 1, it is characterised in that：Step 2) in,
Extrusion molding pressure is 5~15MPa.
5. high-specific surface area Alveolate activated carbon preparation method according to claim 1, it is characterised in that：Step 4）In,
Retort is Tunnel-type carbonization furnace or vertical retort.
6. high-specific surface area Alveolate activated carbon preparation method according to claim 1, it is characterised in that：Step 4) in,
Carbonization temperature is 800~850 DEG C.
7. high-specific surface area Alveolate activated carbon preparation method according to claim 1, it is characterised in that：Step 5) in,
Activation furnace is rotary activated furnace or tunnel type activation furnace.
8. high-specific surface area Alveolate activated carbon preparation method according to claim 1, it is characterised in that：Step 5) in,
Activation temperature is 850~900 DEG C.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111573668A (en) * | 2020-05-22 | 2020-08-25 | 大同煤矿集团有限责任公司 | Activated carbon prepared from waste carbonized material powder and preparation method and application thereof |
| CN111874904A (en) * | 2020-08-18 | 2020-11-03 | 胡红建 | Preparation process of activated carbon |
| CN113860305A (en) * | 2021-10-27 | 2021-12-31 | 湖南白绿林环保科技有限公司 | Preparation method of honeycomb-shaped formed activated carbon |
| CN113912058A (en) * | 2021-10-15 | 2022-01-11 | 青岛华世洁环保科技有限公司 | Preparation method of honeycomb activated carbon |
| CN115671972A (en) * | 2022-09-21 | 2023-02-03 | 保利长大工程有限公司 | Method for treating waste gas and waste smoke of asphalt station |
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| CN116393115A (en) * | 2023-05-16 | 2023-07-07 | 河南嘉祥新能源科技有限公司 | Activated carbon hazardous waste treatment process |
| CN116459791A (en) * | 2023-04-26 | 2023-07-21 | 福建省鑫森炭业股份有限公司 | Filter material based on honeycomb activated carbon and preparation method and application thereof |
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| CN111573668A (en) * | 2020-05-22 | 2020-08-25 | 大同煤矿集团有限责任公司 | Activated carbon prepared from waste carbonized material powder and preparation method and application thereof |
| CN111573668B (en) * | 2020-05-22 | 2023-05-26 | 晋能控股煤业集团有限公司 | Activated carbon prepared from waste carbonized material powder, and preparation method and application thereof |
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| CN111874904B (en) * | 2020-08-18 | 2021-08-31 | 江苏乾汇和环保再生有限公司 | Preparation process of activated carbon |
| CN113912058A (en) * | 2021-10-15 | 2022-01-11 | 青岛华世洁环保科技有限公司 | Preparation method of honeycomb activated carbon |
| CN113912058B (en) * | 2021-10-15 | 2023-04-25 | 青岛华世洁环保科技有限公司 | Preparation method of honeycomb activated carbon |
| CN113860305B (en) * | 2021-10-27 | 2023-09-05 | 湖南白绿林环保科技有限公司 | Preparation method of honeycomb shaped activated carbon |
| CN113860305A (en) * | 2021-10-27 | 2021-12-31 | 湖南白绿林环保科技有限公司 | Preparation method of honeycomb-shaped formed activated carbon |
| CN115671972A (en) * | 2022-09-21 | 2023-02-03 | 保利长大工程有限公司 | Method for treating waste gas and waste smoke of asphalt station |
| CN115722192A (en) * | 2022-11-25 | 2023-03-03 | 煤炭科学技术研究院有限公司 | Method for preparing composite activated carbon from multi-source carbonaceous raw material |
| CN116459791A (en) * | 2023-04-26 | 2023-07-21 | 福建省鑫森炭业股份有限公司 | Filter material based on honeycomb activated carbon and preparation method and application thereof |
| CN116393115A (en) * | 2023-05-16 | 2023-07-07 | 河南嘉祥新能源科技有限公司 | Activated carbon hazardous waste treatment process |
| CN116393115B (en) * | 2023-05-16 | 2024-08-06 | 河南嘉祥新能源科技有限公司 | Activated carbon hazardous waste treatment process |
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Application publication date: 20171010 |