CN117801844A - Method for recycling tobacco waste and waste plastic by catalyzing red mud - Google Patents
Method for recycling tobacco waste and waste plastic by catalyzing red mud Download PDFInfo
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- 239000002699 waste material Substances 0.000 title claims abstract description 159
- 241000208125 Nicotiana Species 0.000 title claims abstract description 111
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 111
- 239000004033 plastic Substances 0.000 title claims abstract description 97
- 229920003023 plastic Polymers 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004064 recycling Methods 0.000 title claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 48
- 239000003054 catalyst Substances 0.000 claims abstract description 35
- 238000002309 gasification Methods 0.000 claims abstract description 25
- 238000000227 grinding Methods 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 35
- 238000007873 sieving Methods 0.000 claims description 23
- 239000010453 quartz Substances 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 2
- 239000002910 solid waste Substances 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000012216 screening Methods 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 46
- 239000000843 powder Substances 0.000 description 30
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 9
- 239000004809 Teflon Substances 0.000 description 8
- 229920006362 Teflon® Polymers 0.000 description 8
- 239000012159 carrier gas Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 239000000741 silica gel Substances 0.000 description 8
- 229910002027 silica gel Inorganic materials 0.000 description 8
- 239000004570 mortar (masonry) Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 235000019504 cigarettes Nutrition 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 238000004131 Bayer process Methods 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000017858 demethylation Effects 0.000 description 1
- 238000010520 demethylation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 229910052598 goethite Inorganic materials 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052664 nepheline Inorganic materials 0.000 description 1
- 239000010434 nepheline Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Catalysts (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses a method for recycling tobacco waste and waste plastic by using red mud as a catalyst, and belongs to the technical field of resource recovery. Drying, crushing and screening tobacco waste and waste plastics, putting the tobacco waste and the waste plastics into a tube furnace, drying, grinding and screening massive solid waste red mud, and adding the dried and ground solid waste red mud into the tube furnace to serve as a catalyst, so that synthesis gas is generated under the condition that the tobacco waste and the waste plastics are decomposed at high temperature, and the red mud catalyst can promote the decomposition of the tobacco waste and the waste plastics so as to improve the yield of the synthesis gas; the invention overcomes the defects of high catalyst cost and low product quality in the treatment of tobacco waste by the gasification technology, and widens the resource utilization way of industrial solid waste red mud.
Description
Technical Field
The invention belongs to the technical field of resource recovery, and particularly relates to a method for recycling tobacco waste and waste plastics by using red mud as a catalyst.
Background
Tobacco is one of the most important commercial crops in the world today, the countries for producing tobacco leaves and producing cigarettes globally are hundreds, china is the first major tobacco consumption country in the world, the yield of China cigarettes reaches 24182.4 hundred million in 2021, and the increment of China is 0.77% in the last five years. The industrial and commercial tax sum of the 2021 tobacco industry is 13581 hundred million yuan, the same proportion is increased by 6.08 percent, the financial sum is 12442 hundred million yuan, the increment is 3.36 percent, and the history is new. However, the cigarette industry takes a lot of high quality tobacco as raw materials, and with the recent improvement of cigarette structure, the proportion of available tobacco leaves in the total biomass in the tobacco production is gradually reduced. In the whole process from tobacco collection, tobacco baking and final cigarette processing, about 20% -30% of mildewed tobacco leaves, tobacco straws, tobacco stems, fireworks, tobacco seeds, tobacco stems, veins and other offcuts are discarded to form tobacco waste, the tobacco waste is improperly treated, resources are wasted, the economic benefits of tobacco farmers are damaged, and environmental pollution is caused to restrict sustainable development of the tobacco industry.
Plastic has become one of the most widely used materials due to its excellent properties, and global plastic consumption reaches 3.67 million tons in 2020. Meanwhile, the production amount of waste plastics and the emission amount of harmful gases such as carbon dioxide and dioxin in the waste plastics incineration process are rapidly increased, 2.5 hundred million tons of waste plastics are produced globally in 2020, and the emission amount of carbon dioxide produced by treating the waste plastics in an incineration manner exceeds 12.5 hundred million tons. The increasing amount of waste plastics year by year and the inability to effectively treat the waste plastics have led to increasing environmental and climate problems, and how to realize efficient, low-carbon and reasonable recycling of waste plastics has become a common challenge for all people.
Red mud is a large amount of solid waste in the aluminum industry, 1-2 t red mud is produced when 1t of aluminum oxide is produced generally, and the storage amount of the red mud in China is over 11 hundred million tons at present. The departments of 2022, industry and informatization department jointly print "about accelerating the implementation scheme for promoting the comprehensive utilization of industrial resources", and the comprehensive utilization level of the red mud is required to be effectively improved by 2025. With the continuous policy support of government, the red mud is utilized as a resourceIs receiving more and more attention. The red mud contains various minerals such as hematite, quartz, calcite, ilmenite, goethite, nepheline calcium, etc., wherein the chemical components include Fe 2 O 3 、Al 2 O 3 、SiO 2 、CaO、TiO 2 And the like.
In order to solve the problem that tobacco waste, waste plastic and massive solid waste red mud are difficult to be recycled efficiently, the invention utilizes the waste red mud to catalyze the tobacco waste and the waste plastic, thereby achieving the purpose of recycling.
Disclosure of Invention
Aiming at the defects of the prior art, the method takes the red mud as the catalyst to be placed into a tube furnace, and under the high temperature condition, the tobacco waste and waste plastics generate high-quality synthetic gas, so that the defects of high catalyst cost and low product quality in the process of treating the tobacco waste in the gasification technology are overcome, and the method widens the resource utilization way of the industrial solid waste red mud.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for recycling tobacco waste and waste plastic by using red mud as a catalyst comprises the following steps:
(1) Respectively drying, crushing and sieving the tobacco waste and waste plastics for later use, and drying, grinding and sieving the red mud for later use;
(2) Mixing the tobacco waste and waste plastics obtained in the step (1), then placing the mixture into a bin above a vertical tube furnace, and placing red mud into a quartz tube;
(3) Introducing N into a tube furnace 2 Setting the temperature of the tube furnace, and opening a feed bin when the tube furnace is heated to the required temperature, so that the mixture of tobacco waste and waste plastic falls into a heating zone of the quartz tube to start gasification reaction;
(4) The outlet of the tube furnace is connected with a gas purifying device for collecting gas.
As a preferred embodiment of the present invention, in the step (1), the drying temperature of the tobacco waste and the waste plastics is 60 to 80 ℃; sieving with 60-100 mesh sieve.
In the step (1), the drying temperature of the red mud is 80-120 ℃; sieving with 60-100 mesh sieve.
As a preferred embodiment of the present invention, in the step (2), the mass of the tobacco waste is 10% -70% of the mass of the mixture of the tobacco waste and the waste plastic; the mass ratio of the red mud to the mixture of the tobacco waste and the waste plastic is 1: (0.5-2).
As a preferred embodiment of the present invention, in the step (3), N is introduced 2 The flow rate of the catalyst is 30-100 mL/min; the temperature of the tube furnace is 600-900 ℃, and the temperature rising rate is 5-15 ℃/min.
As a preferred embodiment of the present invention, in the step (4), the gas includes H 2 、CO、CO 2 、CH 4 。
The principle of the invention is as follows:
the high H/C composition in the waste plastic can compensate the high oxygen and low hydrogen composition of the tobacco waste. Fe in red mud 2 O 3 Can promote the demethylation, demethoxylation and cracking of long-chain hydrocarbon, and improve H 2 And CH (CH) 4 Acid sites on CaO allow the tobacco waste to undergo a surface ketonization process that cleaves acetic acid into acetone, carbon dioxide and water, al 2 O 3 Promote the removal of methoxy functional groups to a certain extent, facilitate the generation of acid and aldehyde, and TiO 2 The method has strong removal effect on methoxy functional groups, and can greatly increase the quantity of phenolic compounds.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the red mud is used as a catalyst, the tobacco waste and the waste plastics are treated in a co-gasification mode, the characteristics between the two are utilized, the synergistic effect of the tobacco waste and the waste plastics is realized, the quality of gasification products is improved, and the recycling way of the red mud is widened.
Drawings
Fig. 1 is a flow chart of the recycling treatment of the tobacco waste and waste plastics by using the red mud in the invention.
Fig. 2 is an XRD pattern of red mud.
FIG. 3 is a graph showing the total gas yield versus the total gas yields in examples 1-5 and comparative examples 1-3.
FIG. 4 is a graph showing comparison of the amounts of gases in examples 1 to 5 and comparative examples 1 to 3.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
The tobacco waste used in the examples and comparative examples is derived from tobacco waste of a farmland in Kunming, yunnan province; the red mud is Bayer process red mud produced by certain aluminum industry company in Yunnan Wenshan.
Example 1
A method for recycling tobacco waste and waste plastic by using red mud as catalyst is shown in figure 1, and comprises the following steps:
(1) Drying tobacco waste and waste plastics in an electrothermal constant-temperature blast drying oven at 80 ℃ for 12 hours, putting the dried tobacco waste and waste plastics in a crusher, crushing the crushed tobacco waste and waste plastics in the crusher, and sieving the crushed tobacco waste and waste plastics with a 80-mesh sieve to obtain tobacco powder and plastic powder for later use;
(2) Drying the red mud in an electrothermal constant-temperature blast drying oven at 100 ℃ for 12 hours, grinding the red mud by an agate mortar, and sieving the ground red mud by a 80-mesh sieve to obtain a red mud catalyst for later use;
(3) Mixing 0.7g of tobacco powder obtained in the step (1) with 0.3g of plastic powder, then placing the mixture into a bin above a vertical tube furnace, and uniformly placing 1.0g of red mud catalyst into a quartz tube;
(4) Introducing N with flow rate of 50mL/min into a tube furnace 2 As carrier gas, setting the heating rate of the tube furnace to be 10 ℃/min and the temperature to be 600 ℃, opening a feed bin when the temperature of the tube furnace is raised to 600 ℃, and enabling the mixed raw materials to fall into a heating zone of a quartz tube to start gasification reaction;
(5) And (3) connecting a dryer drying gas filled with allochroic silica gel at the outlet of the tubular furnace, collecting hydrogen-rich synthetic gas by using a Teflon gas collection bag, and closing the tubular furnace after gasification reaction for 30min to stop collecting the gas.
Example 2
A method for recycling tobacco waste and waste plastic by using red mud as catalyst is shown in figure 1, and comprises the following steps:
(1) Drying tobacco waste and waste plastics in an electrothermal constant-temperature blast drying oven at 60 ℃ for 24 hours, putting the dried tobacco waste and waste plastics in a crusher, crushing the crushed tobacco waste and waste plastics in the crusher, and sieving the crushed tobacco waste and waste plastics with a 100-mesh sieve to obtain tobacco powder and plastic powder for later use;
(2) Drying the red mud in an electrothermal constant-temperature blast drying oven at 120 ℃ for 12 hours, grinding the red mud by an agate mortar, and sieving the ground red mud by a 100-mesh sieve to obtain a red mud catalyst for later use;
(3) Mixing 0.5g of tobacco powder obtained in the step (1) with 0.5g of plastic powder, then placing the mixture into a bin above a vertical tube furnace, and uniformly placing 1.5g of red mud catalyst into a quartz tube;
(4) Introducing N with flow rate of 70mL/min into a tube furnace 2 As carrier gas, setting the heating rate of the tube furnace to be 15 ℃/min, setting the temperature to be 700 ℃, opening a feed bin when the temperature of the tube furnace is raised to 700 ℃, and enabling the mixed raw materials to fall into a heating zone of a quartz tube to start gasification reaction;
(5) And (3) connecting a dryer drying gas filled with allochroic silica gel at the outlet of the tubular furnace, collecting hydrogen-rich synthetic gas by using a Teflon gas collection bag, and closing the tubular furnace after gasification reaction for 30min to stop collecting the gas.
Example 3
A method for recycling tobacco waste and waste plastic by using red mud as catalyst is shown in figure 1, and comprises the following steps:
(1) Drying tobacco waste and waste plastics in an electrothermal constant-temperature blast drying oven at 80 ℃ for 24 hours, putting the dried tobacco waste and waste plastics in a crusher, crushing the crushed tobacco waste and waste plastics in the crusher, and sieving the crushed tobacco waste and waste plastics with a 100-mesh sieve to obtain tobacco powder and plastic powder for later use;
(2) Drying the red mud in an electrothermal constant-temperature blast drying oven at 120 ℃ for 24 hours, grinding the red mud by an agate mortar, and sieving the ground red mud by a 100-mesh sieve to obtain a red mud catalyst for later use;
(3) Mixing 0.3g of tobacco powder obtained in the step (1) with 0.7g of plastic powder, then placing the mixture into a bin above a vertical tube furnace, and uniformly placing 2.0g of red mud catalyst into a quartz tube;
(4) Introducing N with flow rate of 100mL/min into a tube furnace 2 As carrier gas, setting the heating rate of the tube furnace to be 10 ℃/min and the temperature to be 800 ℃, opening a feed bin when the temperature of the tube furnace is increased to 800 ℃, and enabling the mixed raw materials to fall into a heating zone of a quartz tube to start gasification reaction;
(5) And (3) connecting a dryer drying gas filled with allochroic silica gel at the outlet of the tubular furnace, collecting hydrogen-rich synthetic gas by using a Teflon gas collection bag, and closing the tubular furnace after gasification reaction for 30min to stop collecting the gas.
Example 4
A method for recycling tobacco waste and waste plastic by using red mud as catalyst is shown in figure 1, and comprises the following steps:
(1) Drying tobacco waste and waste plastics in an electrothermal constant-temperature blast drying oven at 80 ℃ for 24 hours, putting the dried tobacco waste and waste plastics in a crusher, crushing the crushed tobacco waste and waste plastics in the crusher, and sieving the crushed tobacco waste and waste plastics with a 100-mesh sieve to obtain tobacco powder and plastic powder for later use;
(2) Drying the red mud in an electrothermal constant-temperature blast drying oven at 120 ℃ for 24 hours, grinding the red mud by an agate mortar, and sieving the ground red mud by a 100-mesh sieve to obtain a red mud catalyst for later use;
(3) Mixing 0.1g of tobacco powder obtained in the step (1) with 0.9g of plastic powder, then placing the mixture into a bin above a vertical tube furnace, and uniformly placing 2.0g of red mud catalyst into a quartz tube;
(4) Introducing N with flow rate of 100mL/min into a tube furnace 2 As carrier gas, setting the heating rate of the tube furnace to be 10 ℃/min and the temperature to be 900 ℃, opening a feed bin when the temperature of the tube furnace is raised to 900 ℃, and enabling the mixed raw materials to fall into a heating zone of a quartz tube to start gasification reaction;
(5) And (3) connecting a dryer drying gas filled with allochroic silica gel at the outlet of the tubular furnace, collecting hydrogen-rich synthetic gas by using a Teflon gas collection bag, and closing the tubular furnace after gasification reaction for 30min to stop collecting the gas.
Example 5
A method for recycling tobacco waste and waste plastic by using red mud as catalyst is shown in figure 1, and comprises the following steps:
(1) Drying tobacco waste and waste plastics in an electrothermal constant-temperature blast drying oven at 80 ℃ for 24 hours, putting the dried tobacco waste and waste plastics in a crusher, crushing the crushed tobacco waste and waste plastics in the crusher, and sieving the crushed tobacco waste and waste plastics with a 100-mesh sieve to obtain tobacco powder and plastic powder for later use;
(2) Drying the red mud in an electrothermal constant-temperature blast drying oven at 120 ℃ for 24 hours, grinding the red mud by an agate mortar, and sieving the ground red mud by a 100-mesh sieve to obtain a red mud catalyst for later use;
(3) Mixing 0.5g of tobacco powder obtained in the step (1) with 0.5g of plastic powder, then placing the mixture into a bin above a vertical tube furnace, and uniformly placing 2.0g of red mud catalyst into a quartz tube;
(4) Introducing N with flow rate of 100mL/min into a tube furnace 2 As carrier gas, setting the heating rate of the tube furnace to be 10 ℃/min and the temperature to be 900 ℃, opening a feed bin when the temperature of the tube furnace is raised to 900 ℃, and enabling the mixed raw materials to fall into a heating zone of a quartz tube to start gasification reaction;
(5) And (3) connecting a dryer drying gas filled with allochroic silica gel at the outlet of the tubular furnace, collecting hydrogen-rich synthetic gas by using a Teflon gas collection bag, and closing the tubular furnace after gasification reaction for 30min to stop collecting the gas.
Comparative example 1
A method for recycling tobacco waste and waste plastic by using red mud as catalyst is shown in figure 1, and comprises the following steps:
(1) Drying tobacco waste in an electrothermal constant-temperature blast drying oven at 80 ℃ for 12 hours, putting the tobacco waste in a crusher for crushing, and sieving the crushed tobacco waste with a 80-mesh sieve to obtain tobacco powder for later use;
(2) Drying the red mud in an electrothermal constant-temperature blast drying oven at 100 ℃ for 12 hours, grinding the red mud by an agate mortar, and sieving the ground red mud by a 80-mesh sieve to obtain a red mud catalyst for later use;
(3) 1.0g of tobacco powder obtained in the step (1) is put into a bin above a vertical tube furnace, and 1.0g of red mud catalyst is uniformly put into a quartz tube;
(4) Introducing N with flow rate of 50mL/min into a tube furnace 2 As carrier gas, setting the heating rate of the tube furnace to be 10 ℃/min and the temperature to be 600 ℃, opening a feed bin when the tube furnace is heated to 600 ℃, and enabling tobacco powder to fall into a heating zone of a quartz tube to start gasification reaction;
(5) And (3) connecting a dryer drying gas filled with allochroic silica gel at the outlet of the tubular furnace, collecting hydrogen-rich synthetic gas by using a Teflon gas collection bag, and closing the tubular furnace after gasification reaction for 30min to stop collecting the gas.
Comparative example 2
A method for recycling tobacco waste and waste plastic by using red mud as catalyst is shown in figure 1, and comprises the following steps:
(1) Drying waste plastics in an electrothermal constant-temperature blast drying oven at 80 ℃ for 12 hours, then placing the waste plastics in a crusher for crushing, and sieving the waste plastics with a 80-mesh sieve to obtain plastic powder for later use;
(2) Drying the red mud in an electrothermal constant-temperature blast drying oven at 100 ℃ for 12 hours, grinding the red mud by an agate mortar, and sieving the ground red mud by a 80-mesh sieve to obtain a red mud catalyst for later use;
(3) Mixing 1.0g of the plastic powder obtained in the step (1), then placing the mixture into a bin above a vertical tube furnace, and uniformly placing 1.0g of red mud catalyst into a quartz tube;
(4) Introducing N with flow rate of 50mL/min into a tube furnace 2 As carrier gas, setting the heating rate of the tube furnace to be 10 ℃/min and the temperature to be 600 ℃, opening a feed bin when the temperature of the tube furnace is raised to 600 ℃, and enabling the plastic powder to fall into a heating zone of a quartz tube to start gasification reaction;
(5) And (3) connecting a dryer drying gas filled with allochroic silica gel at the outlet of the tubular furnace, collecting hydrogen-rich synthetic gas by using a Teflon gas collection bag, and closing the tubular furnace after gasification reaction for 30min to stop collecting the gas.
Comparative example 3
A method for recycling tobacco waste and waste plastic by using red mud as catalyst is shown in figure 1, and comprises the following steps:
(1) Drying tobacco waste and waste plastics in an electrothermal constant-temperature blast drying oven at 80 ℃ for 12 hours, putting the dried tobacco waste and waste plastics in a crusher, crushing the crushed tobacco waste and waste plastics in the crusher, and sieving the crushed tobacco waste and waste plastics with a 80-mesh sieve to obtain tobacco powder and plastic powder for later use;
(2) Mixing 0.3g of tobacco powder obtained in the step (1) with 0.7g of plastic powder, and then placing the mixture into a bin above a vertical tube furnace;
(3) Introducing N with flow rate of 50mL/min into a tube furnace 2 As carrier gas, setting the heating rate of the tube furnace to be 10 ℃/min and the temperature to be 600 ℃, opening a feed bin when the temperature of the tube furnace is raised to 600 ℃, and enabling the mixed raw materials to fall into a heating zone of a quartz tube to start gasification reaction;
(5) And (3) connecting a dryer drying gas filled with allochroic silica gel at the outlet of the tubular furnace, collecting hydrogen-rich synthetic gas by using a Teflon gas collection bag, and closing the tubular furnace after gasification reaction for 30min to stop collecting the gas.
Figure 2 is an XRD pattern of red mud,from the figure, it can be seen that the red mud contains Fe 2 O 3 、Al 2 O 3 、Ca 2 CO 3 、Na 2 CO 3 。
Table 1 the yields and compositions of the hydrogen-rich synthesis gas produced in examples 1-5 and comparative examples 1-3.
As can be seen from examples 1 to 5 in table 1, as the gasification temperature increases, the decomposition of the macromolecular substance generates more gas, resulting in an increase in the total gas yield; and with the increase of the content of plastics in the raw materials, H in the synthetic gas is high due to the rich H content in the plastics and the high H/C mole ratio 2 The content of (2) increases. In addition, as the content of the red mud catalyst increases, the red mud promotes the decomposition of macromolecular substances into micromolecular gases, and the total gas yield is also increased.
According to the embodiment 1 and the comparative examples 1-3 in the table 1, the red mud is used as the catalyst, the tobacco waste and the waste plastics are treated in a co-gasification mode, the characteristics between the two are utilized, the synergistic effect of the tobacco waste and the waste plastics is realized, the quality of gasification products is improved, and the recycling way of the red mud is widened.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. The method for recycling the tobacco waste and the waste plastic by using the red mud is characterized by comprising the following steps of:
(1) Respectively drying, crushing and sieving the tobacco waste and waste plastics for later use, and drying, grinding and sieving the red mud for later use;
(2) Mixing the tobacco waste and waste plastics obtained in the step (1), then placing the mixture into a bin above a vertical tube furnace, and placing red mud into a quartz tube;
(3) Introducing N into a tube furnace 2 Setting the temperature of the tube furnace, and opening a feed bin when the tube furnace is heated to the required temperature, so that the mixture of tobacco waste and waste plastic falls into a heating zone of the quartz tube to start gasification reaction;
(4) The outlet of the tube furnace is connected with a gas purifying device for collecting gas.
2. The method for catalyzing recycling treatment of tobacco waste and waste plastic by using red mud according to claim 1, wherein in the step (1), the drying temperature of the tobacco waste and waste plastic is 60-80 ℃; sieving with 60-100 mesh sieve.
3. The method for catalyzing the recycling treatment of tobacco waste and waste plastic by using the red mud as set forth in claim 1, wherein in the step (1), the drying temperature of the red mud is 80-120 ℃; sieving with 60-100 mesh sieve.
4. The method for recycling the tobacco waste and the waste plastic by using the red mud as claimed in claim 1, wherein in the step (2), the mass of the tobacco waste is 10% -70% of the mass of the mixture of the tobacco waste and the waste plastic; the mass ratio of the red mud to the mixture of the tobacco waste and the waste plastic is 1: (0.5-2).
5. The method for recycling the tobacco waste and the waste plastics by catalyzing the red mud according to claim 1, wherein in the step (3), N is introduced 2 The flow rate of the catalyst is 30-100 mL/min; the temperature of the tube furnace is 600-900 ℃, and the temperature rising rate is 5-15 ℃/min.
6. As claimed inThe method for recycling tobacco waste and waste plastic by catalyzing with red mud according to claim 1, wherein in the step (4), the gas comprises H 2 、CO、CO 2 、CH 4 。
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