CN113501519A - Method for preparing activated carbon and recovering zinc by utilizing waste tire rubber pyrolytic carbon - Google Patents
Method for preparing activated carbon and recovering zinc by utilizing waste tire rubber pyrolytic carbon Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/336—Preparation characterised by gaseous activating agents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
- C01G9/03—Processes of production using dry methods, e.g. vapour phase processes
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Abstract
The invention provides a method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon, which comprises the following steps: processing pyrolytic carbon generated after pyrolysis of waste tire rubber to obtain a qualified carbonized material; activating the obtained qualified carbonized material to obtain activated carbon and zinc-containing tail gas; supplementing oxidizing gas into the obtained zinc-containing tail gas for combustion to obtain smoke containing zinc oxide; carrying out heat exchange and gas-solid separation on the flue gas containing the zinc oxide to obtain a crude zinc oxide product; the method has the advantages that the zinc is efficiently recovered while the activated carbon is produced by utilizing the waste tire pyrolytic carbon, the economic benefit is improved, and the method has a good industrial application prospect.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a method for preparing activated carbon and recovering zinc by utilizing waste tire rubber pyrolytic carbon.
Background
The total amount of various automobiles in China is increased year by year, so that the amount of the replaced waste tires reaches the service life/mileage every year and is rapidly increased, and the quantity of the replaced waste tires reaches 1200 ten thousand tons/year at present. The production of oil by pyrolysis of waste tire rubber has been developed into an important waste tire solid treatment mode, but the pyrolysis product of the oil and gas is removed, and about 40 wt% of pyrolytic carbon is generated. The pyrolytic carbon mainly contains fixed carbon, more than 10 wt% of ash and 3-5 wt% of zinc, has complex composition, can only be used as low-end filler in the aspects of rubber, plastics and the like at present, has no high-value utilization way, and has limited market capacity. Efforts are constantly being made to expand the application field and increase the value thereof, including the production of activated carbon from waste tire rubber pyrolytic carbon and the extraction of zinc therefrom.
CN1373085A discloses a method for preparing activated carbon from carbon powder generated by waste tire pyrolysis, which uses the carbon powder generated by waste tire pyrolysis as a raw material and uses a fluidized bed reactor to carry out carbonization and activation to obtain powdered activated carbon. However, the fluidized bed operating characteristics result in a relatively narrow particle size range of the feedstock being processed and an inefficient recovery of zinc. CN106241803A discloses a method for preparing activated carbon from waste tire pyrolytic carbon black, which comprises the steps of mixing pyrolytic carbon black with an activating agent KOH or concentrated sulfuric acid with the mass fraction of 98%, heating and carrying out an activating reaction to obtain an activated material. The method uses chemical reagents to produce the activated carbon, has high cost, complex post-treatment process and serious pollution, and can not recover zinc. CN109705635A discloses a method for deashing waste tire cracking carbon black and recovering ZnO, which comprises adding waste tire cracking carbon residue into an organic weak acid solution to dissolve zinc therein, recovering organic acid, washing, drying, and calcining the obtained solid to obtain ZnO. The method has high cost of consuming organic acid and can not produce active carbon simultaneously. CN110760204A adopts a high-temperature vacuum distillation method, zinc vapor generated by the reaction of zinc oxide and carbon black at high temperature escapes and is recovered. The method can not produce the active carbon, and the solid-solid reaction of the zinc oxide and the carbon black is far less than the gas-solid reaction of the zinc oxide and the carbon monoxide, so the production efficiency is low.
In summary, the existing technical methods can only produce activated carbon products or recover zinc products singly, and how to provide a technical method capable of utilizing waste tires to pyrolyze carbon to prepare activated carbon and recover zinc at the same time becomes a problem which needs to be solved urgently at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon, which comprises the following steps:
(1) processing pyrolytic carbon generated after pyrolysis oil extraction of waste tire rubber to obtain a qualified carbonized material;
(2) activating the qualified carbonized material obtained in the step (1) to obtain activated carbon and zinc-containing tail gas;
(3) supplementing oxidizing gas into the zinc-containing tail gas obtained in the step (2) for combustion to obtain smoke containing zinc oxide; and carrying out heat exchange and gas-solid separation on the flue gas containing the zinc oxide to obtain a crude zinc oxide product.
According to the method, the pyrolysis carbon obtained by pyrolyzing the waste tire rubber is utilized to produce the activated carbon, and simultaneously, the zinc in the activated carbon is efficiently recovered, so that the resource utilization and high-value utilization of the waste tire are realized, the economic benefit is improved, and a new development space is provided for the waste tire pyrolysis treatment industry; the method has simple process flow, reduces the investment cost, improves the production efficiency and is beneficial to industrial application.
In the invention, the zinc-containing tail gas refers to tail gas containing gaseous elemental zinc.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
As a preferable technical scheme of the invention, the environment of the pyrolysis in the step (1) is an oxygen-free environment.
Preferably, the oxygen-free environment comprises a protective atmosphere or a vacuum state.
Preferably, the protective atmosphere comprises nitrogen and/or an inert gas.
Preferably, the temperature of the pyrolysis in step (1) is 400-900 ℃, such as 400 ℃, 500 ℃, 600 ℃, 700 ℃, 800 ℃ or 900 ℃ and the like, but is not limited to the recited values, and other non-recited values within this range are equally applicable, preferably 400-550 ℃.
Preferably, the zinc content of the pyrolytic carbon in step (1) is 3-5 wt%, such as 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, or 5 wt%, etc., but not limited to the recited values, and other non-recited values within the range are also applicable.
As a preferable technical scheme of the invention, the pyrolytic carbon in the step (1) is subjected to impurity removal before processing treatment.
In the invention, in order to ensure the quality of the subsequently obtained activated carbon and zinc oxide, impurities such as metal wires, gravels and the like in the pyrolytic carbon need to be removed; the impurity removal mode comprises magnetic iron removal, heavy separation and screening of sand, and the like.
As a preferable technical scheme of the invention, the processing treatment in the step (1) sequentially comprises grinding and screening.
Preferably, after the sieving, the qualified carbonized material has a particle size of not more than 50mm, for example, 0.5mm, 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, or 50mm, etc., but is not limited to the enumerated values, and other unrecited values within this range of values are equally applicable, preferably 1 to 10 mm.
Preferably, the amount of volatiles in the acceptable char material is from 10 to 20 wt%, such as 10 wt%, 12 wt%, 14 wt%, 16 wt%, 18 wt% or 20 wt%, etc., but is not limited to the recited values, and other values not recited within the range of values are equally applicable.
As a preferred technical scheme of the invention, the activating medium adopted in the activation in the step (2) comprises water vapor.
Preferably, the weight ratio of the steam to the acceptable char material is (2-3.5):1, such as 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, 3:1, 3.2:1 or 3.5:1, but not limited to the recited values, and other values not recited within this range of values are equally applicable.
In the present invention, the amount of water vapor added has a certain influence on the activation effect. If the addition amount of the water vapor is too much, the activation is excessive, and the obtained activated carbon has large aperture, small specific surface area and low yield; if the amount of steam added is too small, the activation will be insufficient and the specific surface area of the resulting activated carbon will be small.
As a preferred embodiment of the present invention, the temperature for the activation in step (2) is 800-1050 deg.C, such as 800 deg.C, 850 deg.C, 900 deg.C, 950 deg.C, 1000 deg.C or 1050 deg.C, but not limited to the values listed, and other values not listed within this range are equally applicable, preferably 920-980 deg.C.
Preferably, the activation time in step (2) is 30-300min, such as 30min, 60min, 90min, 120min, 150min, 180min, 210min, 240min, 270min or 300min, etc., preferably 90-180 min.
As a preferable technical scheme of the invention, the activated carbon obtained in the step (2) is subjected to cooling treatment.
Preferably, the temperature of the temperature reduction treatment is not higher than 100 ℃, for example, 60 ℃, 70 ℃, 80 ℃, 90 ℃ or 100 ℃, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
In the invention, the cooled activated carbon can be screened according to the use requirement to obtain products with different particle size requirements, and the screening limits of various products are different, so the invention is not particularly limited to this.
As a preferred technical scheme of the invention, the oxidizing gas in the step (3) comprises air and/or pure oxygen.
As a preferred embodiment of the present invention, the oxygen concentration in the flue gas containing zinc oxide in step (3) is 2-5 vol.%, for example, 2 vol.%, 2.5 vol.%, 3 vol.%, 3.5 vol.%, 4 vol.%, 4.5 vol.% or 5 vol.%, but not limited to the recited values, and other unrecited values within the range of values are also applicable.
In the invention, the purpose of supplementing the oxidizing gas is to burn combustible gas contained in the zinc-containing tail gas and oxidize gaseous elemental zinc in the zinc-containing tail gas into zinc oxide; and the oxygen concentration in the flue gas after combustion is limited, so that complete combustion of combustible gas can be effectively ensured, gaseous elemental zinc is completely converted into zinc oxide, and the recovery rate of zinc is improved.
Preferably, the gas-solid separation sequentially comprises primary gas-solid separation and secondary gas-solid separation.
Preferably, the heat exchange is carried out simultaneously with a primary gas-solid separation. Preferably, the primary gas-solid separation means comprises sedimentation or cyclonic separation.
Preferably, the secondary gas-solid separation comprises cloth bag filtration.
Preferably, the tail gas filtered by the cloth bag is desulfurized, and the desulfurized tail gas is discharged after reaching the standard.
Preferably, collecting fine powder obtained in the heat exchange and cloth bag filtration processes, wherein the fine powder is a crude zinc oxide product.
In the present invention, the heat exchange, the bag filtration and the desulfurization are all conventional operations in the art, and the present invention is not limited thereto.
As a preferred technical scheme of the invention, the method comprises the following steps:
(1) pyrolyzing the waste tire rubber in an oxygen-free environment at the temperature of 400-550 ℃ to obtain pyrolytic carbon with the zinc content of 3-5 wt%; removing impurities from the obtained pyrolytic carbon, and then grinding and screening to obtain a qualified carbonized material with the particle size of 1-10mm and the volatile matter content of 10-20 wt%;
(2) introducing steam according to the weight ratio of the steam to the qualified carbonized material (2-3.5):1, and activating the qualified carbonized material for 90-180min at 920-; the activated carbon is subjected to cooling treatment and then is screened or milled to obtain an activated carbon product;
(3) supplementing oxidizing gas into the zinc-containing tail gas obtained in the step (2) for combustion to obtain zinc oxide-containing flue gas, wherein the oxygen concentration in the zinc oxide-containing flue gas is 2-5 vol.%; then carrying out heat exchange, gas-solid separation and tail gas desulfurization on the flue gas containing the zinc oxide to obtain a crude product of the zinc oxide; and the desulfurized tail gas is discharged after reaching the standard.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method of the invention utilizes the waste tire pyrolytic carbon to produce the activated carbon and simultaneously efficiently recovers the zinc therein, realizes the resource and high-value utilization of the activated carbon, improves the economic benefit, and leads the yield of the activated carbon to reach more than 37.7 percent and the specific surface area of the activated carbon to reach 756.2m2More than g, the recovery rate of zinc reaches more than 82.2 percent;
(2) the method of the invention adopts the integrated technology to produce the active carbon and recover the zinc, thereby reducing the investment cost, improving the production efficiency, providing a new development space for the pyrolysis treatment industry of the waste tires and being beneficial to the industrialized production.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
The following are typical but non-limiting examples of the invention:
in all the following examples, the fines obtained during the heat exchange and cloth bag filtration process were collected.
Example 1:
the embodiment provides a method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon, which comprises the following steps:
(1) pyrolyzing waste tire rubber under the protection of nitrogen and at 400 ℃ in an oxygen-free condition to obtain pyrolytic carbon with 3 wt% of zinc; removing impurities such as metal wires, gravels and the like in the pyrolytic carbon, and then grinding and screening to obtain qualified carbonized materials with the particle size of 3-10mm and the volatile matter content of 15 wt%;
(2) introducing steam according to the weight ratio of the steam to the qualified carbonized material of 3:1, and activating the qualified carbonized material for 100min at 920 ℃ to obtain activated carbon and zinc-containing tail gas; cooling the activated carbon to 90 ℃;
(3) supplementing air to the zinc-containing tail gas obtained in the step (2) for combustion to obtain zinc oxide-containing flue gas, wherein the oxygen concentration in the zinc oxide-containing flue gas is 2 vol.%; then, carrying out cyclone separation, cloth bag filtration and tail gas desulfurization on the flue gas containing the zinc oxide while exchanging heat to obtain a crude product of the zinc oxide; and the desulfurized tail gas reaches the standard and is discharged.
Example 2:
the embodiment provides a method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon, which comprises the following steps:
(1) pyrolyzing waste tire rubber under the protection of nitrogen and at 550 ℃ under an anaerobic condition to obtain pyrolytic carbon with 5 wt% of zinc; removing impurities such as metal wires, gravels and the like in the pyrolytic carbon, and then grinding and screening to obtain qualified carbonized materials with the particle size of 5-10mm and the volatile matter content of 10 wt%;
(2) introducing steam according to the weight ratio of the steam to the qualified carbonized material of 2.5:1, and activating the qualified carbonized material for 120min at 980 ℃ to obtain activated carbon and zinc-containing tail gas; cooling the activated carbon to 80 ℃;
(3) supplementing air to the zinc-containing tail gas obtained in the step (2) for combustion to obtain zinc oxide-containing flue gas, wherein the oxygen concentration in the zinc oxide-containing flue gas is 3 vol.%; then, carrying out cyclone separation, cloth bag filtration and tail gas desulfurization on the flue gas containing the zinc oxide while exchanging heat to obtain a crude product of the zinc oxide; and the desulfurized tail gas reaches the standard and is discharged.
Example 3:
the embodiment provides a method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon, which comprises the following steps:
(1) pyrolyzing waste tire rubber under the vacuum state and the anaerobic condition of 500 ℃ to obtain pyrolytic carbon with the zinc content of 4 wt%; removing impurities such as metal wires, gravels and the like in the pyrolytic carbon, and then grinding and screening to obtain qualified carbonized materials with the particle size of 1-8mm and the volatile matter content of 10 wt%;
(2) introducing steam according to the weight ratio of the steam to the qualified carbonized material of 3.5:1, and activating the qualified carbonized material for 90min at 980 ℃ to obtain activated carbon and zinc-containing tail gas; cooling the activated carbon to 95 ℃;
(3) supplementing air to the zinc-containing tail gas obtained in the step (2) for combustion to obtain zinc oxide-containing flue gas, wherein the oxygen concentration in the zinc oxide-containing flue gas is 5 vol.%; then, carrying out heat exchange and sedimentation on the flue gas containing the zinc oxide, and then carrying out cloth bag filtration and tail gas desulfurization to obtain a crude zinc oxide product; the treated tail gas reaches the standard and is discharged.
Example 4:
the embodiment provides a method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon, which comprises the following steps:
(1) pyrolyzing waste tire rubber under the protection of nitrogen and at 520 ℃ in an oxygen-free condition to obtain pyrolytic carbon with the zinc content of 3.2 wt%; removing impurities such as metal wires, gravels and the like in the pyrolytic carbon, and then grinding and screening to obtain qualified carbonized materials with the particle size of 3-8mm and the volatile matter content of 10 wt%;
(2) introducing steam according to the weight ratio of the steam to the qualified carbonized material of 3:1, and activating the qualified carbonized material for 150min at 950 ℃ to obtain activated carbon and zinc-containing tail gas; cooling the activated carbon to 75 ℃;
(3) supplementing air to the zinc-containing tail gas obtained in the step (2) for combustion to obtain flue gas containing zinc oxide, wherein the oxygen concentration in the flue gas containing zinc oxide is 4 vol.%; then, carrying out cyclone separation on the flue gas containing the zinc oxide while exchanging heat, and then carrying out cloth bag filtration and front tail gas desulfurization to obtain a crude product of the zinc oxide; the treated tail gas reaches the standard and is discharged.
Example 5:
the embodiment provides a method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon, which comprises the following steps:
(1) pyrolyzing waste tire rubber under the protection of nitrogen and at 400 ℃ in an oxygen-free condition to obtain pyrolytic carbon with the zinc content of 3.5 wt%; removing impurities such as metal wires, gravels and the like in the pyrolytic carbon, and then grinding and screening to obtain qualified carbonized materials with the particle size of 40-50mm and the volatile matter content of 20 wt%;
(2) introducing steam according to the weight ratio of the steam to the qualified carbonized material of 2:1, and activating the qualified carbonized material for 300min at 850 ℃ to obtain activated carbon and zinc-containing tail gas; cooling the activated carbon to 80 ℃;
(3) supplementing air to the zinc-containing tail gas obtained in the step (2) for combustion to obtain zinc oxide-containing flue gas, wherein the oxygen concentration in the zinc oxide-containing flue gas is 3 vol.%; then, carrying out cyclone separation, cloth bag filtration and tail gas desulfurization on the flue gas containing the zinc oxide while exchanging heat to obtain a crude product of the zinc oxide; the treated tail gas reaches the standard and is discharged.
Example 6:
the embodiment provides a method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon, which comprises the following steps:
(1) pyrolyzing waste tire rubber under the protection of nitrogen and under the anaerobic condition of 420 ℃ to obtain pyrolytic carbon with 3 wt% of zinc; removing impurities such as metal wires, gravels and the like in the pyrolytic carbon, and then grinding and screening to obtain qualified carbonized materials with the particle size of 10-15mm and the volatile matter content of 12 wt%;
(2) introducing steam according to the weight ratio of the steam to the qualified carbonized material of 2.5:1, and activating the qualified carbonized material for 60min at 1050 ℃ to obtain activated carbon and zinc-containing tail gas; cooling the activated carbon to 100 ℃;
(3) supplementing pure oxygen to the zinc-containing tail gas obtained in the step (2) for combustion to obtain zinc oxide-containing flue gas, wherein the oxygen concentration in the zinc oxide-containing flue gas is 5 vol.%; then, carrying out cyclone separation, cloth bag filtration and tail gas desulfurization on the flue gas containing the zinc oxide while exchanging heat to obtain a crude product of the zinc oxide; the treated tail gas reaches the standard and is discharged.
Example 7:
this example provides a method for preparing activated carbon and recovering zinc using pyrolytic carbon from scrap tire rubber, which is referenced to the method of example 5, except that: and (3) introducing steam in the step (2) according to the weight ratio of the steam to the qualified carbonized material of 1: 1.
The yields, specific surface areas and zinc recoveries of the activated carbons obtained in examples 1 to 7 were measured, and the results are shown in table 1.
TABLE 1
Examples 1-6 the method of the present invention for preparing activated carbon from waste tire rubber pyrolytic carbon has high specific surface area, and also can recover zinc efficiently, especially, under the conditions of example 3, the yield of activated carbon is 39.3%, and the specific surface area reaches 962.7m2The zinc recovery rate reaches 95.7 percent; in example 7, the amount of steam introduced during activation was reduced, resulting in insufficient activation, and the specific surface area of activated carbon and the recovery rate of zinc were significantly reduced.
The method adopts the integrated technology to produce the active carbon and recover the zinc, realizes the resource and high-value utilization of the waste tires, and improves the economic benefit; the method has simple process flow, reduces the investment cost, improves the production efficiency, provides a new development space for the pyrolysis treatment industry of the waste tires, and is beneficial to industrial production.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It will be apparent to those skilled in the art that any modifications to the present invention, equivalents thereof, additions of additional operations, selection of specific ways, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A method for preparing activated carbon and recovering zinc by using waste tire rubber pyrolytic carbon is characterized by comprising the following steps:
(1) processing pyrolytic carbon generated after pyrolysis of waste tire rubber to obtain a qualified carbonized material;
(2) activating the qualified carbonized material obtained in the step (1) to obtain activated carbon and zinc-containing tail gas;
(3) supplementing oxidizing gas into the zinc-containing tail gas obtained in the step (2) for combustion to obtain smoke containing zinc oxide; and carrying out heat exchange and gas-solid separation on the flue gas containing the zinc oxide to obtain a crude zinc oxide product.
2. The method of claim 1, wherein the pyrolysis environment of step (1) is an oxygen-free environment;
preferably, the oxygen-free environment comprises a protective atmosphere or a vacuum state;
preferably, the protective atmosphere comprises nitrogen and/or an inert gas;
preferably, the temperature of the pyrolysis in the step (1) is 400-900 ℃, preferably 400-550 ℃;
preferably, the zinc content in the pyrolytic carbon in the step (1) is 3-5 wt%.
3. The method according to claim 1 or 2, wherein the pyrolytic carbon of step (1) is subjected to impurity removal before processing.
4. A method according to any one of claims 1 to 3, wherein the processing of step (1) comprises grinding and sieving in sequence;
preferably, after the screening, the grain size of the qualified carbonized material is not more than 50mm, and preferably 1-10 mm;
preferably, the content of volatile matters in the qualified carbonized material is 10-20 wt%.
5. The method according to any one of claims 1 to 4, wherein the activating medium used in the activation in step (2) comprises water vapor;
preferably, the weight ratio of the water vapor to the qualified carbonized material is (2-3.5): 1.
6. The method according to any one of claims 1 to 5, wherein the temperature for the activation in step (2) is 800-1050 ℃, preferably 920-980 ℃;
preferably, the activation time of step (2) is 30-300min, preferably 90-180 min.
7. The method according to any one of claims 1 to 6, wherein the activated carbon obtained in step (2) is subjected to a temperature reduction treatment;
preferably, the temperature of the temperature reduction treatment is below 100 ℃.
8. The method according to any one of claims 1 to 7, wherein the oxidizing gas of step (3) comprises air and/or pure oxygen.
9. The method according to any one of claims 1 to 8, wherein the concentration of oxygen in the zinc oxide-containing flue gas of step (3) is 2 to 5 vol.%;
preferably, the gas-solid separation sequentially comprises primary gas-solid separation and secondary gas-solid separation;
preferably, the heat exchange is carried out while primary gas-solid separation is carried out;
preferably, the primary gas-solid separation means comprises sedimentation or cyclonic separation;
preferably, the secondary gas-solid separation mode comprises cloth bag filtration;
preferably, the tail gas filtered by the cloth bag is desulfurized, and the desulfurized tail gas is discharged after reaching the standard;
preferably, collecting fine powder obtained in the heat exchange and cloth bag filtration processes, wherein the fine powder is a crude zinc oxide product.
10. Method according to any of claims 1-9, characterized in that the method comprises the steps of:
(1) pyrolyzing the waste tire rubber in an oxygen-free environment at the temperature of 400-550 ℃ to obtain pyrolytic carbon with the zinc content of 3-5 wt%; removing impurities from the obtained pyrolytic carbon, and then grinding and screening to obtain a qualified carbonized material with the particle size of 1-10mm and the volatile matter content of 10-20 wt%;
(2) introducing steam according to the weight ratio of the steam to the qualified carbonized material (2-3.5):1, and activating the qualified carbonized material for 90-180min at 920-; the activated carbon is subjected to cooling treatment and then is screened or milled to obtain an activated carbon product;
(3) supplementing oxidizing gas into the zinc-containing tail gas obtained in the step (2) for combustion to obtain zinc oxide-containing flue gas, wherein the oxygen concentration in the zinc oxide-containing flue gas is 2-5 vol.%; then carrying out heat exchange, gas-solid separation and tail gas desulfurization on the flue gas containing the zinc oxide to obtain a crude product of the zinc oxide; and the desulfurized tail gas is discharged after reaching the standard.
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| CN115558796A (en) * | 2022-11-04 | 2023-01-03 | 昆明理工大学 | Method for resource extraction of zinc oxide from waste tire coupled blast furnace ash |
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| US4264568A (en) * | 1978-02-13 | 1981-04-28 | Tosco Corporation | Method for easily removing zinc from carbon black contaminated with zinc |
| JPH0848511A (en) * | 1994-08-09 | 1996-02-20 | Ube Techno Enji Kk | Removal of zinc from waste tire carbonization char and production of active carbon |
| US20050112041A1 (en) * | 2003-11-21 | 2005-05-26 | Horne Deane A. | Method for producing higher purity zinc oxide |
| CN101164876A (en) * | 2007-09-30 | 2008-04-23 | 南开大学 | Method for preparing carbon black and active carbon from waste tyre pyrolytic carbon |
| CN101987745A (en) * | 2009-07-29 | 2011-03-23 | 财团法人工业技术研究院 | Method for manufacturing zinc oxide and device thereof |
| CN107312558A (en) * | 2017-06-22 | 2017-11-03 | 神雾科技集团股份有限公司 | A kind of waste painting slag containing zinc reclaims zinc technology and system with vinasse cooperative disposal |
| CN108163885A (en) * | 2018-02-05 | 2018-06-15 | 杨金国 | A kind of waste tyre pyrolytic carbon black prepares the method and device of zinc sulfate |
| CN111574859A (en) * | 2020-06-22 | 2020-08-25 | 珠海格力绿色再生资源有限公司 | Treatment system and treatment method for waste tire cracking carbon black |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558796A (en) * | 2022-11-04 | 2023-01-03 | 昆明理工大学 | Method for resource extraction of zinc oxide from waste tire coupled blast furnace ash |
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| CN113501519B (en) | 2023-03-10 |
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