CN114855305A - Preparation method of carbon nanofiber material - Google Patents
Preparation method of carbon nanofiber material Download PDFInfo
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- CN114855305A CN114855305A CN202210437596.6A CN202210437596A CN114855305A CN 114855305 A CN114855305 A CN 114855305A CN 202210437596 A CN202210437596 A CN 202210437596A CN 114855305 A CN114855305 A CN 114855305A
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- 239000000463 material Substances 0.000 title claims abstract description 43
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000002134 carbon nanofiber Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000003054 catalyst Substances 0.000 claims abstract description 40
- 239000002699 waste material Substances 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000006229 carbon black Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000003738 black carbon Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000007605 air drying Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 239000012634 fragment Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 230000001954 sterilising effect Effects 0.000 claims abstract description 4
- 239000011777 magnesium Substances 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 11
- 102000020897 Formins Human genes 0.000 claims description 8
- 108091022623 Formins Proteins 0.000 claims description 8
- -1 salt compounds Chemical class 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052723 transition metal Inorganic materials 0.000 claims description 4
- 150000003624 transition metals Chemical class 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical class [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 238000005229 chemical vapour deposition Methods 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010000 carbonizing Methods 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 239000010453 quartz Substances 0.000 description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 17
- 241001465754 Metazoa Species 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 238000007233 catalytic pyrolysis Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000010812 mixed waste Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 206010000117 Abnormal behaviour Diseases 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920000426 Microplastic Polymers 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000037406 food intake Effects 0.000 description 1
- 208000037824 growth disorder Diseases 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
- D01F9/20—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products
- D01F9/21—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from polyaddition, polycondensation or polymerisation products from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- 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
- C01B32/15—Nano-sized carbon materials
Abstract
The invention discloses a preparation method of a carbon nanofiber material, which comprises the following steps: 1) collecting waste medical protective articles, sterilizing with 75% alcohol, air drying, and cutting into pieces; 2) mixing the fragments, the catalyst and the carbon black in the step 1), and placing the mixture in a heating reaction container for reaction under the conditions of: reacting for 10-60 min at 600-1200 ℃, wherein the temperature rise and fall rate in the reaction process is 1-30 ℃ min < -1 >; 3) cooling, collecting a black carbon product, soaking in hydrochloric acid, washing, and drying to obtain a carbon nanofiber material; the yield of the carbon nanofiber material can reach more than 35 percent; the advantages and effects are as follows: the waste medical protective articles, a catalyst capable of carbonizing the waste medical protective articles and carbon black are mixed, and are heated and carbonized under the nitrogen protection condition by a chemical vapor deposition method to prepare the carbon nanofiber material, so that the waste medical protective articles are recycled, the carbon yield of the products is improved, and the resource waste is reduced.
Description
Technical Field
The invention belongs to the technical field of carbon nano-material preparation, and particularly relates to a preparation method of a carbon nano-fiber material.
Background
Due to the outbreak of new crown epidemic situations, the dosage of medical protective articles is greatly increased, wherein the mask becomes an indispensable article for daily travel, if each person uses one mask every day for estimation, 1290 hundred million waste masks are generated every month in the world, and the dosage of protective clothes and protective gloves which must be worn by medical care personnel during work is continuously increased. When the waste medical protective articles are not treated properly, the micro plastic generated by decomposition of the waste medical protective articles can enter soil and oceans. The ingestion of micro-organisms, plankton etc. by environmental micro-plastics, which subsequently enter the animal body with the food chain, results in their stunting and abnormal behaviour. And human beings at the top of the food chain can further enrich the animal containing the micro-plastic after eating the animal, so that the animal is harmful to the human bodies.
The traditional methods for treating the waste medical protective articles comprise two methods, namely incineration and landfill, but the two methods easily cause the waste medical protective articles to generate toxic secondary pollutants, waste resources and easily pollute the environment. The prior art has been premised on the ability to carbonize polypropylene over catalysts such as: a method for preparing carbon nanotubes and hydrogen gas by using a waste medical mask at a high value (application No. 2021106514297) and a method for converting the waste mask into CNT by catalytic pyrolysis (application No. 2021114210128) both adopt two-stage closed heating, and a method for preparing carbon nanotubes and hydrogen gas by using the waste medical mask at a high value (application No. 2021106514297) has a yield of at most 26%, and a method for converting the waste mask into CNT by catalytic pyrolysis (application No. 2021114210128) has a yield of at most 25.470%. The conversion rate is relatively low, and the high-value utilization of the waste medical protective articles cannot be realized. Therefore, the carbon nanofiber material is prepared by mixing the waste medical protective articles serving as carbon sources, the catalyst and the carbon black in the same section through a chemical vapor deposition method, and the method is also a potential resource recycling mode.
The disposable medical protective articles, such as medical disposable masks, N95 masks, disposable protective clothing, isolation gowns, disposable gloves and shoe covers. The raw materials are all polymeric substances with high carbon content, and the carbon-containing polymer can be carbonized to form the carbon nanofiber material by a chemical vapor deposition method. Thereby realizing the high-value conversion and utilization from the waste medical protective articles to the carbon nanofiber materials.
Disclosure of Invention
The invention aims to solve the problem of increased burden of waste medical supplies on the environment, and provides a method for converting waste medical protective supplies into carbon nanofiber materials by a chemical vapor deposition method.
A method of preparing a carbon nanofiber material, comprising:
1) collecting waste medical protective articles, sterilizing with 75% alcohol, air drying, and cutting into pieces;
2) introducing N into a heating reaction container for 15-60 min 2 The internal air is exhausted; mixing the fragments, the catalyst and the carbon black in the step 1), and placing the mixture in a heating reaction container for reaction under the conditions of: 600-1200 ℃ and 10-60 min of reaction, wherein the temperature rise and fall rate in the reaction process is 1-30 ℃ for min -1 ；
3) Cooling, collecting black carbon product, soaking in hydrochloric acid to remove catalyst, and washing to neutrality; drying to obtain the carbon nanofiber material;
the catalyst is a metal catalyst;
the addition amount of the catalyst is 5-12% of the weight of the chips; the addition amount of the carbon black is 3-15% of the weight of the chips;
the reaction in the step 2) is carried out under the conditions that: at 800 ℃, reacting for 15min, wherein the temperature rise and fall rate in the reaction process is 1-30 ℃ for min -1 ；
The metal catalyst is prepared from transition metal, and the transition metal is prepared by mixing simple substances of nickel, molybdenum, magnesium, iron or/and cobalt or metal salt compounds thereof;
the metal catalyst is a Ni-Mo-Mg metal catalyst;
the Ni-Mo-Mg metal catalyst is prepared by the following method:
1) according to the molar ratio of nickel, molybdenum and magnesium of 1: 0.1: 1-7: 0.7: 1 mixing the three substances according to the ratio of the amount of the substances, and adding polyethylene glycol for dissolving;
2) standing, heating at 550-650 ℃ for 0.5-1.5 h, and increasing and decreasing the temperature rate in the reaction process for 1-30 ℃ min -1 Cooling and grinding to obtain the Ni-Mo-Mg metal catalyst;
heating at 600 ℃ for 1 h;
the material of the waste medical protective articles is polypropylene, polyethylene and/or polyvinyl chloride.
The invention provides a preparation method of a carbon nanofiber material, which comprises the following steps: 1) collecting waste medical protective articles, sterilizing with 75% alcohol, air drying, and cutting into pieces; 2) introducing N into a heating reaction container for 15-60 min 2 The internal air is exhausted; mixing the fragments, the catalyst and the carbon black in the step 1), and placing the mixture in a heating reaction container for reaction under the conditions of: 600-1200 ℃ and 10-60 min of reaction, wherein the temperature rise and fall rate in the reaction process is 1-30 ℃ for min -1 (ii) a 3) Cooling, collecting black carbon product, soaking in hydrochloric acid to remove catalyst, and washing to neutrality; drying to obtain the carbon nanofiber material; the yield of the carbon nanofiber material can reach more than 4 percent; compared with the prior art, the method has the following advantages and effects: the waste medical protective articles, a catalyst capable of carbonizing the waste medical protective articles and carbon black are mixed, and are heated and carbonized under the protection of nitrogen by a chemical vapor deposition method to prepare carbon nanofiber materials, so that the waste medical protective articles are recycled. By adding carbon black, the waste medical protective product samples and the catalyst for blending, the carbon yield of the product is greatly improved, the disposable waste medical protective product can be effectively utilized, and the resource waste is reduced.
Drawings
FIG. 1 is a scanning electron microscope image of a carbon nanofiber material prepared in example 1 of the present invention;
fig. 2 is a scanning electron microscope image of the carbon nanofiber material prepared in example 1 of the present invention.
Detailed Description
Example 1 preparation of carbon nanofiber Material
Preparation of Ni-Mo-Mg metal catalyst
From Ni (NO) 3 ) 2 、 (NH4) 2 MoO 4 、Mg(CH3COO) 2 Mixing, adding 200ml of polyethylene glycol for dissolving; dissolving, standing, heating in a muffle furnace (600 deg.C) for 1h, and increasing and decreasing temperature at 1-30 deg.C for min -1 (ii) a Cooling and grinding to obtain the Ni-Mo-Mg metal catalyst.
Secondly, preparing the carbon nanofiber material
Taking a waste mask as an example, the waste mask is cut into chips; firstly introducing N2 with the flow rate of 50mL/min for 15min into the tubular quartz furnace device, and exhausting air in the quartz tube; 2g of waste mask inner layer scraps, 0.15g of Ni-Mo-Mg metal catalyst and 0.1g of carbon black are mixed and placed into a horizontal quartz tube, and then the horizontal quartz tube is placed into a tubular quartz furnace; reacting for 15min at the temperature of 800 ℃; the temperature rise and fall rate in the reaction process is 1-30 ℃ min -1 (ii) a Stopping heating when no gas is released, cooling the quartz tube to room temperature, collecting a black carbon product, and then soaking the obtained carbon product in hydrochloric acid for 24 hours to remove the Ni-Mo-Mg catalyst; washing to neutrality, and drying to obtain carbon nanofiber material; by passing
Calculated, the yield was 2.8%.
Fig. 1 and 2 are SEM images of the carbon nanofiber material prepared in this example. The diameter of the carbon nanofiber material is about 6-12 nm. According to morphological analysis, the nano-composite material has a larger length-diameter ratio and good heat transfer effect.
Example 2 preparation of carbon nanofiber Material
Preparation of Ni-Mo-Mg metal catalyst
From Ni (NO) 3 ) 2 、(NH4) 2 MoO 4 、Mg(CH3COO) 2 Mixing, adding 200ml of polyethylene glycol for dissolving; dissolving, standing, heating in a muffle furnace (600 deg.C) for 1h, and increasing and decreasing temperature at 1-30 deg.C for min -1 (ii) a Cooling and grinding to obtain the Ni-Mo-Mg metal catalyst.
Secondly, preparing the carbon nanofiber material
Taking a waste mask as an example, the waste mask is cut into chips; the tubular quartz furnace device is firstly introduced with N2 with the flow rate of 50mL/min for 15min, and the air in the quartz tube is exhausted. 2g of three-layer mixed waste mask scraps, 0.15g of Ni-Mo-Mg metal catalyst and 0.1g of carbon black are mixed and placed into a horizontal quartz tube, and then the horizontal quartz tube is placed into a tubular quartz furnace; reacting for 15min at the temperature of 800 ℃; the temperature rise and fall rate in the reaction process is 1-30 ℃ min -1 (ii) a Stopping heating when no gas is released, cooling the quartz tube to room temperature, collecting a black carbon product, and then soaking the obtained carbon product in hydrochloric acid for 24 hours to remove the Ni-Mo-Mg catalyst; washing to neutrality, and drying to obtain carbon nanofiber material; by passing
The calculated yield was 21%.
Example 3 preparation of carbon nanofiber Material
Preparation of Ni-Mo-Mg metal catalyst
From Ni (NO) 3 ) 2 、 (NH4) 2 MoO 4 、Mg(CH3COO) 2 Mixing, adding 200ml of polyethylene glycol for dissolving; dissolving, standing, heating in a muffle furnace (600 deg.C) for 1h, and increasing and decreasing temperature at 1-30 deg.C for min -1 (ii) a Cooling and grinding to obtain the Ni-Mo-Mg metal catalyst.
Secondly, preparing the carbon nanofiber material
Taking a waste mask as an example, the waste mask is cut into chips; the tubular quartz furnace device is firstly introduced with N2 with the flow rate of 50mL/min for 15min, and the air in the quartz tube is exhausted. 2g of three-layer mixed waste mask scraps, 0.15g of Ni-Mo-Mg metal catalyst and 0.1g of carbon black are mixed together, and then carbon fiber treated by plasma is added; put into horizontalPutting the quartz tube into a tubular quartz furnace; reacting for 15min at the temperature of 800 ℃; the temperature rise and fall rate in the reaction process is 1-30 ℃ min -1 (ii) a Stopping heating when no gas is released, cooling the quartz tube to room temperature, collecting a black carbon product, and then soaking the obtained carbon product in hydrochloric acid for 24 hours to remove the Ni-Mo-Mg catalyst; washing to neutrality, and drying to obtain carbon nanofiber material; by passing
The calculated yield was 39%.
Claims (9)
1. A preparation method of a carbon nanofiber material is characterized by comprising the following steps: it includes:
1) collecting waste medical protective articles, sterilizing with 75% alcohol, air drying, and cutting into pieces;
2) introducing N into a heating reaction container for 15-60 min 2 The internal air is exhausted; mixing the fragments, the catalyst and the carbon black in the step 1), and placing the mixture in a heating reaction container for reaction under the conditions that: 600-1200 ℃ and 10-60 min of reaction, wherein the temperature rise and fall rate in the reaction process is 1-30 ℃ for min -1 ；
3) Cooling, collecting black carbon product, soaking in hydrochloric acid to remove catalyst, and washing to neutrality; and drying to obtain the carbon nanofiber material.
2. The method for preparing a carbon nanofiber material as claimed in claim 1, wherein: the catalyst is a metal catalyst.
3. The method for producing a carbon nanofiber material as claimed in claim 1 or 2, wherein: the addition amount of the catalyst is 5-12% of the weight of the chips; the addition amount of the carbon black is 3-15% of the weight of the chips.
4. The method for preparing a carbon nanofiber material as claimed in claim 3, wherein: the reaction in the step 2) is carried out under the conditions that: 800 degreeC, reacting for 15min, wherein the temperature rise and fall rate in the reaction process is 1-30 ℃ for min -1 。
5. The method for preparing a carbon nanofiber material as claimed in claim 4, wherein: the metal catalyst is prepared from transition metal, and the transition metal is prepared by mixing simple substances of nickel, molybdenum, magnesium, iron or/and cobalt or metal salt compounds thereof.
6. The method for preparing a carbon nanofiber material as claimed in claim 5, wherein: the metal catalyst is Ni-Mo-Mg metal catalyst.
7. The method for preparing a carbon nanofiber material as claimed in claim 6, wherein: the Ni-Mo-Mg metal catalyst is prepared by the following method:
1) the molar ratio of nickel, molybdenum and magnesium is 1: 0.1: 1-7: 0.7: 1, mixing the three substances according to the ratio of the amount of the substances, and adding polyethylene glycol for dissolving;
2) standing, heating at 550-650 ℃ for 0.5-1.5 h, and increasing and decreasing the temperature rate in the reaction process for 1-30 ℃ min -1 Cooling and grinding to obtain the Ni-Mo-Mg metal catalyst.
8. The method for preparing a carbon nanofiber material as claimed in claim 7, wherein: the heating is carried out at the temperature of 600 ℃ for 1 h.
9. The method for preparing a carbon nanofiber material as claimed in claim 8, wherein: the material of the waste medical protective articles is polypropylene, polyethylene and/or polyvinyl chloride.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115569966A (en) * | 2022-11-03 | 2023-01-06 | 山东金利特新材料有限责任公司 | Recycling method of waste filter element |
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2022
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| CN115569966A (en) * | 2022-11-03 | 2023-01-06 | 山东金利特新材料有限责任公司 | Recycling method of waste filter element |
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Application publication date: 20220805 |