CN106637304B - Aluminum electrolysis flue gas purification method and deduster - Google Patents
Aluminum electrolysis flue gas purification method and deduster Download PDFInfo
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- CN106637304B CN106637304B CN201710081891.1A CN201710081891A CN106637304B CN 106637304 B CN106637304 B CN 106637304B CN 201710081891 A CN201710081891 A CN 201710081891A CN 106637304 B CN106637304 B CN 106637304B
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- flue
- flue gas
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- aluminum oxide
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/22—Collecting emitted gases
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a kind of aluminum electrolysis flue gas purification method and dedusters, it realizes that adsorbent fresh aluminum oxide and fluoro-containing alumina are separately added into purification system by the flue collector import and auxillary flue import that are independently arranged on each deduster unit；By a large amount of fluoro-containing alumina from the most of electrolysis flue gas containing high concentration harmful substance of preliminary clearning after flue collector addition system, the flue gas for further purifying preliminary clearning using the fresh aluminum oxide being added from auxillary flue simultaneously, realizes the step purification of electrolysis flue gas.The present invention has the advantages that good purification, deduster, and work efficiency is high.When two deduster mirror-image arrangements, can use wallboards of box body in deduster unit can reduce system cost as total discharge pipe.
Description
Technical field
The present invention relates to the purification method and its deduster of the smoking gas containing fluorine generated in a kind of purifying electrolysis aluminium production process,
Belong to aluminium electroloysis industry Smoke Gas Purity by Electrolysis technical field.
Background technique
In Aluminium Industry production, electrolytic cell will generate flue gas largely containing HF in aluminium electrolysis process, in flue gas
If HF enter ambient enviroment, generation environment is polluted, to animals and plants body generate toxic side effect.In the prior art, lead to
Frequently with flue gas dry cleaning measure, that is, use the hydrogen fluoride in alumina adsorption flue gas with the nuisance in purifying smoke, control
Fluoride emission amount processed reduces the pollution to ambient enviroment to reach state environmental emissioning standard.
It is generally larger using Aluminum Electrolysis Production raw alumina specific surface area in current electrolysis aluminum i ndustry, to nocuousness such as HF
Gas has the characteristic of stronger adsorption capacity, and alumina powder is put into flue gas, adsorbs the nuisances gases such as the HF in flue gas.Its
The deduster used is usually to put into fresh aluminum oxide from the inlet flue duct of deduster and be already engaged in containing for adsorption reaction
Fluorine alumina simultaneously mixes (fluoro-containing alumina amount is less compared with fresh aluminum oxide amount) with flue gas, by aluminium oxide by having in flue gas
Evil substance absorption, adsorb flue gas after aluminium oxide got off by the sock filtration of deduster, by ash bucket collect rear portion send to
In gassiness aluminum oxide warehouse, a part, which is repeated, is added above-mentioned deduster inlet pipeline, and the flue gas being cleaned can be emptied directly.
To avoid the direct impact dust remover cloth bag of a large amount of aluminium oxide from causing cloth bag damaged, deduster usually installs inertia pre-separate device
Dust collector ash hopper will be fallen directly into after most of aluminium oxide pre-separation.But due in traditional technology, fresh aluminum oxide and fluorine-containing
Aluminium oxide is simultaneously added deduster inlet pipeline, and activity is strong, the larger fresh aluminum oxide of particle is most of by used in deduster
Property pre-separate device separation after fall into ash bucket, a part is returned to be recycled to for electrolysis production, a part work in fluoro-containing alumina the storehouse in
It repeats that purification system is added for cyclic oxidation aluminium.In traditional technology, the time that the strong fresh aluminum oxide of activity participates in gas cleaning is short,
And be fed directly to after largely being separated in fluoro-containing alumina storehouse for electrolysis production, the activity of fresh aluminum oxide does not obtain
It makes full use of；In addition, can be attached to filter bag of dust collector surface with flue gas stream forms the oxidation that " muffin layer " realizes final filtration
Aluminium is all the fluoro-containing alumina that adsorption activity is poor, particle is small, and " muffin layer " adsorption activity is poor.The above problem affects aluminium oxide
To the purification efficiency of hydrogen fluoride, cause conventional purge procedures clean-up effect undesirable.
Summary of the invention
The object of the present invention is to provide a kind of clean-up effects preferably, the higher aluminum electrolysis flue gas purification side of filter bag working efficiency
Method and its deduster, with overcome the deficiencies in the prior art.
The present invention is implemented as follows: a kind of electrolytic aluminum smoke purification method, it includes using deduster purifying smoke, is led to
The flue collector import and auxillary flue import being independently arranged on each deduster unit are crossed, realize adsorbent fresh aluminum oxide and is contained
Fluorine alumina is separately added into purification system.Largely contained by a large amount of fluoro-containing alumina from preliminary clearning after flue collector addition system
There is the electrolysis flue gas of high concentration harmful substance, while it is pre- net to use the fresh aluminum oxide being added from auxillary flue further to purify
The flue gas of change realizes the step purification of electrolysis flue gas.
Wherein, flue collector and auxillary flue flue gas flow than range between 10:1~20:1, to realize using a large amount of
Fluoro-containing alumina is from the most of electrolysis flue gas containing high concentration harmful substance of preliminary clearning after flue collector addition system.
Further, it is filled after the fresh aluminum oxide addition system that auxillary flue is added in ash bucket and by the flue gas of preliminary clearning
Divide mixing, realizes that flue gas further purifies, meanwhile, fresh aluminum oxide is uniformly attached to filter bag table under the action of rising flue gas
Face forms active stronger " muffin layer " in filter bag surface, realizes and the final efficient absorption of electrolysis flue gas is purified and filtered.?
Fluoro-containing alumina feeding device is set on dust collector ash hopper, realizes and is added independently of fluoro-containing alumina into flue collector.
The invention also provides a kind of dedusters for realizing the above method, and every deduster is by more than two independences
Deduster unit compose in parallel, each deduster unit is made of ash bucket, middle cabinet and upper box, and middle cabinet is provided with use
In the filter bag of filtering；Each deduster unit is equipped with a flue collector and an auxillary flue, is provided on the top of flue collector used
Property separator；Ash bucket is equipped with the fluoro-containing alumina feeding device for cyclic oxidation aluminium to be added to flue collector, on auxillary flue
It is provided with fresh aluminum oxide feeding device.
Further, inertial separator is inverted U-shaped structure, for the fluoro-containing alumina of separation of high-concentration, to mitigate filter
Bag burden reduces filter bag of dust collector and wears and reduce system resistance.Flue gas is provided in ash bucket at the top of auxillary flue to be uniformly distributed
Device.Enter the flue gas and fresh aluminum oxide of ash bucket for equal portion's auxillary flue import.When two deduster mirror-image arrangements, utilize
Middle wallboards of box body is as total discharge pipe in deduster unit.
The present invention realizes adsorbent fresh aluminum oxide and fluoro-containing alumina point using the flue collector and auxillary flue being independently arranged
It Jia Ru not purification system.It, will be in flue gas using a large amount of fluoro-containing alumina from preliminary clearning electrolysis flue gas after flue collector addition system
Concentration of harmful substance be reduced to reduced levels, then fluoro-containing alumina is separated by inverted U-shaped inertial separator into ash bucket, is subtracted
Light filter bag burden, reduces filter bag of dust collector and wears and reduce system resistance.Fresh aluminum oxide pass through auxillary flue addition system after
Ash bucket neutralization is sufficiently mixed by the flue gas of preliminary clearning, realizes that flue gas further purifies, meanwhile, fresh aluminum oxide is rising flue gas
Under effect, it is uniformly attached to filter bag surface, active stronger " muffin layer " is formed in filter bag surface, realizes to electrolysis flue gas most
Whole efficient absorption purification and filtering.
Therefore, it is excellent that compared with prior art, the present invention the present invention has good purification, a deduster, work efficiency is high
Point.When two deduster mirror-image arrangements, wallboards of box body can use in deduster unit as total discharge pipe, can reduce and be
System cost.
Detailed description of the invention
Fig. 1 is deduster structural schematic diagram of the invention；
Fig. 2 is the right view of attached drawing 1.
Description of symbols: 1- deduster unit, 2- ash bucket, cabinet in 3-, 4- upper box, 5- filter bag, 6- flue collector, 7-
Auxillary flue, 8- inertial separator, 9- fluoro-containing alumina feeding device, 10- fresh aluminum oxide charging feeding device, 11- flue gas
Uniform distribution device, the total discharge pipe of 12-.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
As shown in Figure 1, deduster structure of the invention be it is such, according to the size of processing exhaust gas volumn, a large size removed
Dirt device is composed in parallel by multiple independent deduster units 1, and each deduster unit 1 is by ash bucket 2, middle cabinet 3 and 4 groups of upper box
At being provided with the filter bag 5 for filtering in middle cabinet 3, each deduster unit 1 has a flue collector 6 and auxillary flue 7, in master
The top of flue 6 is provided with inverted U-shaped inertial separator 8, is provided on ash bucket 2 for cyclic oxidation aluminium to be added to flue collector 6
Fluoro-containing alumina feeding device 9, fresh aluminum oxide feeding device 10 is provided on auxillary flue 7,7 top of auxillary flue is in ash bucket 2
Inside it is provided with flue-gas uniform distribution device 11.Flue-gas uniform distribution device 11 is the muti-piece deflector composition of auxillary flue end installing
, for that will be uniformly distributed the device of flue gas, preferred structure is made of many block blinds.
When two deduster mirror-image arrangements, 3 siding of cabinet can use in deduster unit 1 as total discharge pipe 12.
Electrolytic aluminum smoke purification method of the invention is such that each unit of deduster that it is used, and there are two import cigarettes
Road, flue collector 6 and 7 flue gas flow of auxillary flue are than range between 10:1~20:1.By fresh aluminum oxide and fluoro-containing alumina point
It Tong Guo not two inlet flue ducts addition purification systems of deduster.Wherein, fluoro-containing alumina passes through the fluorine-containing oxygen on dust collector ash hopper 2
Change aluminium feeding device 9 and main flue gas channel is added, passes through the biggish fluoro-containing alumina purification absorption flue gas of active poor but flow
In the nuisances such as HF realize the preliminary clearning of flue gas, the concentration of harmful substance in flue gas is reduced to relatively low level, then, is contained
Fluorine alumina is separated by the inverted U-shaped inertial separator 8 on flue top into ash bucket 2；Fresh aluminum oxide is by being located under filter bag
System is added in the auxillary flue 7 in portion, and the flue gas in fresh aluminum oxide and auxillary flue is sufficiently mixed, since 7 exhaust gas volumn Zhan of auxillary flue is total
Exhaust gas volumn ratio is less (5~10%), after fresh aluminum oxide adsorbs the nuisances such as HF in 7 flue gas of auxillary flue, still maintain compared with
Good activity, then, fresh aluminum oxide under the action of flue-gas uniform distribution device 11 at 7 top of auxillary flue, in ash bucket 2 into
One step and 6 flue gas of flue collector are sufficiently mixed, the nuisances such as HF in 6 flue gas of adsorption cleaning flue collector, meanwhile, with rising flue gas
Effect, fresh aluminum oxide can be attached to 5 surface of filter bag, form active higher " muffin layer ", realize to electrolysis flue gas most
Whole efficient absorption purification and filtering.
Embodiment 1:
The present invention is implemented, as shown in Figure 1, flue gas respectively enters deduster unit from flue collector 6 and auxillary flue 7
1.Using the flue collector 6 and auxillary flue 7 being independently arranged, realize that adsorbent fresh aluminum oxide and fluoro-containing alumina are separately added into purification
System.It is using a large amount of fluoro-containing alumina from preliminary clearning electrolysis flue gas after 6 addition system of flue collector, the nuisance in flue gas is dense
Degree is reduced to reduced levels, and then fluoro-containing alumina is divided by the inverted U-shaped inertial separator 8 being arranged on the top of flue collector 6
From into ash bucket 2, mitigate 5 burden of filter bag, reduces filter bag of dust collector 5 and wear and reduce system resistance.Fresh aluminum oxide passes through pair
It is under the action of flue-gas uniform distribution device 11 that 7 top of auxillary flue is arranged in ash bucket 2 and fluorine-containing after 7 addition system of flue
The flue gas of aluminium oxide preliminary clearning is sufficiently mixed, and realizes that flue gas further purifies, meanwhile, fresh aluminum oxide is in the effect for rising flue gas
Under, it is uniformly attached to 5 surface of filter bag, active stronger " muffin layer " is formed in filter bag surface, realizes to the final of electrolysis flue gas
Efficient absorption purification and filtering.The flue gas being cleaned, after collecting from upper box 4 into total discharge pipe 12, from purification system chimney
Emptying.
Certainly, above is specific application example of the invention, and there are other embodiments of the invention, all using equivalent
The technical solution that replacement or equivalent transformation are formed, all falls within protection scope of the presently claimed invention.
Claims (2)
1. a kind of aluminum electrolysis flue gas purification method, it includes using deduster purifying smoke, it is characterised in that: by removing each
Adsorbent fresh aluminum oxide and fluoro-containing alumina point are realized in the flue collector import and auxillary flue import being independently arranged on dirt device unit
It Jia Ru not purification system；Have from preliminary clearning after flue collector addition system is most of containing high concentration by a large amount of fluoro-containing alumina
The electrolysis flue gas of substance is done harm to, while further purifying the flue gas of preliminary clearning using the fresh aluminum oxide being added from auxillary flue,
Realize the step purification of electrolysis flue gas；Flue collector and auxillary flue flue gas flow are than range between 10:1~20:1；From auxillary flue
It is sufficiently mixed in ash bucket and by the flue gas of preliminary clearning after the fresh aluminum oxide addition system of addition, realizes that flue gas is further net
Change, meanwhile, fresh aluminum oxide is uniformly attached to filter bag surface under the action of rising flue gas, is formed in filter bag surface active strong
Muffin layer, realize and the final efficient absorption of electrolysis flue gas purified and filtering.
2. a kind of deduster for realizing method described in claim 1, it is characterised in that: every deduster is by two or more
Independent deduster unit (1) compose in parallel, each deduster unit (1) is by ash bucket (2), middle cabinet (3) and upper box (4)
Composition, is provided with the filter bag (5) for filtering in middle cabinet (3)；Each deduster unit (1) be equipped with a flue collector (6) and
One auxillary flue (7) is provided with inertial separator (8) on the top of flue collector (6)；Ash bucket (2) is equipped with for main cigarette
The fluoro-containing alumina feeding device (9) of cyclic oxidation aluminium is added in road (6), and fresh aluminum oxide charging dress is provided on auxillary flue (7)
Set (10)；The inertial separator (8) is inverted U-shaped structure；It is uniform that flue gas is provided in ash bucket (2) at the top of auxillary flue (7)
Distribution apparatus (11)；When two deduster mirror-image arrangements, using cabinet (3) siding middle in deduster unit (1) as it is total go out
Air hose (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710081891.1A CN106637304B (en) | 2017-02-15 | 2017-02-15 | Aluminum electrolysis flue gas purification method and deduster |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710081891.1A CN106637304B (en) | 2017-02-15 | 2017-02-15 | Aluminum electrolysis flue gas purification method and deduster |
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| Publication Number | Publication Date |
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| CN106637304A CN106637304A (en) | 2017-05-10 |
| CN106637304B true CN106637304B (en) | 2019-03-01 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109234766A (en) * | 2018-11-09 | 2019-01-18 | 威海市正大环保设备股份有限公司 | The reverse second-stage reaction clarifier of binary channels |
| CN110295376B (en) * | 2019-07-12 | 2024-03-22 | 东方电气集团东方锅炉股份有限公司 | Electrolytic aluminum flue gas purification system and process |
| CN111893516A (en) * | 2020-09-15 | 2020-11-06 | 东北大学设计研究院（有限公司） | Dust remover for purifying aluminum electrolysis flue gas and using method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2861186Y (en) * | 2005-07-21 | 2007-01-24 | 贵阳铝镁设计研究院 | Dust-cleaning equipment |
| CN206486609U (en) * | 2017-02-15 | 2017-09-12 | 贵阳铝镁设计研究院有限公司 | Deduster for aluminum electrolysis flue gas purification |
-
2017
- 2017-02-15 CN CN201710081891.1A patent/CN106637304B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2861186Y (en) * | 2005-07-21 | 2007-01-24 | 贵阳铝镁设计研究院 | Dust-cleaning equipment |
| CN206486609U (en) * | 2017-02-15 | 2017-09-12 | 贵阳铝镁设计研究院有限公司 | Deduster for aluminum electrolysis flue gas purification |
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| CN106637304A (en) | 2017-05-10 |
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