CN107376594A - A kind of method that sulfur dioxide is reclaimed from flue gas - Google Patents
A kind of method that sulfur dioxide is reclaimed from flue gas Download PDFInfo
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- CN107376594A CN107376594A CN201710801366.2A CN201710801366A CN107376594A CN 107376594 A CN107376594 A CN 107376594A CN 201710801366 A CN201710801366 A CN 201710801366A CN 107376594 A CN107376594 A CN 107376594A
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- sulfur dioxide
- flue gas
- zinc
- reclaimed
- absorbent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- General Chemical & Material Sciences (AREA)
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- Treating Waste Gases (AREA)
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Abstract
The invention discloses a kind of method that sulfur dioxide is reclaimed from flue gas.The method that sulfur dioxide is reclaimed from flue gas comprises the following steps：Step 1: flue gas pre-processes；Step 2: first order absorption and two level absorb the sulfur dioxide in series connection removing flue gas；Handle to obtain filtrate and filter residue Step 3: carrying out press filtration；Step 4: using sulphur as fuel, the filter residue that step 3 obtains is calcined at 300~400 DEG C, obtains the mixed gas containing sulfur dioxide and the clinker containing zinc oxide.It is provided by the invention that the method regenerating desulfurization agent of sulfur dioxide is reclaimed from flue gas to reduce sulfur dioxide recovery cost.
Description
Technical field
The present invention relates to protection of natural resources and environment technical field, more particularly to one kind to remove low-concentration sulfur dioxide from flue gas
And the method for realizing recovery.
Background technology
At present in smelting process, it will usually produce the largely flue gas containing sulfur dioxide.With environmental requirement increasingly
Strictly, and exhaust emission standard raising, at present substantial amounts of low-concentration sulfur dioxide caused by smelting process stove belong to need
Recycled.
Tail gas low-concentration sulfur dioxide processing method has：A variety of sides such as lime method, ammonia process, sodium alkali, Dual alkali, absorption method
Method, wherein zinc oxide desulfurization are in electrolytic zinc tail gas desulfurization with relatively broad.To the processing of desulfuration solution after zinc oxide desulfurization
There are two methods, one kind is that zinc sulfite carries out acidolysis with electrolytic zinc waste liquid (acid), produces high-concentration sulfur dioxide and zinc sulfate
Liquid, a kind of is that zinc sulfite solution of zinc sulfate caused by direct oxidation is used the side of the production product such as zinc sulfate again
Method.Prior art reclaims sulfur dioxide using zinc oxide as desulfurizing agent and is primarily present following shortcoming：(1) tail gas sulfur content Gao Shixu
Substantial amounts of desulfurizing agent (zinc oxide) is wanted, desulfurizing agent can not regenerate, increase buying pressure；(2) zinc sulfite electrolytic zinc waste liquid enters
Row acidolysis, sulfur dioxide can be utilized, and Sulphur ressource will not be caused to waste, but its applicability is on the knees of the gods；(3) zinc sulfite is with directly
Solution of zinc sulfate caused by oxidation is connect, solution cannot directly enter electrolysis Zn system, and long-term use can cause to be electrolysed Zn system acid
It is broken with volumetric balance.In addition, when using that leached mud is as desulfurizing agent caused by electrolytic zinc enterprise, because sulfur-bearing up to arrives
16-20%, and there was only 4-6% containing zinc, if zinc oxide is non-renewable, it may also be necessary to supplement other desulfurizing agents or outsourcing oxidation
Zinc.
Therefore, the method for reclaiming sulfur dioxide from flue gas at present is further improved.
The content of the invention
It is a primary object of the present invention to provide a kind of regenerating desulfurization agent to reduce the dioxy of sulfur dioxide recovery cost
Change the recovery method of sulphur.
To achieve the above object, the present invention provides a kind of method that sulfur dioxide is reclaimed from flue gas, described from flue gas
The method of recovery sulfur dioxide comprises the following steps：
Step 1: flue gas pre-processes
Former flue gas enters in scrubbing tower to be obtained by the particulate matter in industry water washing removing flue gas, chloride, fluoride
Pretreated flue gas；
Step 2: first order absorption and two level absorb the sulfur dioxide in series connection removing flue gas
Absorbed to obtain liquid after first order absorption to pretreated flue gas using the first absorbent, utilize the second absorbent
The gas without absorption after first order absorption separates is absorbed to obtain liquid after two level absorbs, wherein the second absorbent is zinc
Scum silica frost ore pulp, liquid is as the first absorbent after two level absorbs；
Step 3: carry out press filtration processing
Liquid carries out press filtration and obtains filtrate and filter residue after the first order absorption that step 2 is obtained, and the filter residue is zinc sulfite；
Step 4: filter residue thermally decomposes desulfurization
Using sulphur as fuel, the filter residue that step 3 obtains is calcined at 300~400 DEG C, obtained mixed containing sulfur dioxide
Close gas and the clinker containing zinc oxide.
Preferably, the method that sulfur dioxide is reclaimed from flue gas also includes:
Step 5: recovery zinc oxide
Using the clinker containing zinc oxide that step 4 obtains as prepare the second absorbent feedstock circulation use or as
The neutral of zinc abstraction leaches raw material.
Preferably, the method that sulfur dioxide is reclaimed from flue gas also includes：
Step 6: recovery contains sulfur dioxide
The mixed gas containing sulfur dioxide that step 4 is obtained is used for Sulphuric acid.
Preferably, second absorbent is that liquid-solid ratio is 10~15：1 zinc dross ore pulp.
Preferably, the pH value of first absorbent is 3.5-4.5.
Preferably, the step of method that sulfur dioxide is reclaimed from flue gas also includes preparing zinc dross ore pulp seven, tool
Body：
Step a) zinc dross pre-processes：Zinc dross is by sieving crude zinc grain of the recovery size in more than 2mm, the part crude zinc
Grain accounts for the 30~45% of the total zinc of zinc dross, then reclaims fine metal particle by gravity separation, and the part fine metal particle accounts for zinc and floated
The 8~10% of the total zinc of slag, the zinc dross finally pre-processed by alkali cleaning, dechlorination, the zinc dross of the pretreatment are chloride<
0.4%, it is less than 78% containing zinc；
Step b) is 10~15 by liquid-solid ratio：1 ratio is by the filtrate of water and/or step 3 and pretreated zinc dross
Zinc is uniformly mixed so as to obtain zinc dross ore pulp.
Preferably, the former flue gas is electrolytic zinc tail gas, 8000mg/Nm containing sulfur dioxide3, 250 DEG C of temperature.
Preferably, the filter residue of step 4 is calcined in fluidized bed furnace.
Present invention simultaneously provides a kind of system that sulfur dioxide is reclaimed from flue gas, the system includes scrubbing tower, one-level
Absorption tower, two-level absorption tower, the first filter press and fluidized bed furnace, the gas outlet of the scrubbing tower and the air inlet of the first grade absorption tower
Mouth connection, the gas outlet of the first grade absorption tower are connected with the air inlet of the two-level absorption tower, and the two-level absorption tower goes out
Gas port is connected with tail gas discharging pipe, and the liquid outlet of the two-level absorption tower is connected with the inlet of the first grade absorption tower, described
The liquid outlet of first grade absorption tower is connected with the inlet of the first filter press, slag notch and the fluidized bed furnace of first filter press
Charging aperture connection.
Preferably, the system also includes zinc dross ore pulp preparation facilities, the zinc dross ore pulp preparation facilities include according to
Secondary connection is used to sieve the coarse grained Raymond machine of recovery, for the fine grain shaking table of gravity separation recovery, agitator, the second pressure
Filter and absorbent circulatory pool, the absorbent circulatory pool are connected with the inlet of the two-level absorption tower.
Relative to prior art, a kind of method that sulfur dioxide is reclaimed from flue gas provided by the invention has beneficial below
Effect：
First, liquid after obtaining the first absorption as absorbent sulfur dioxide absorption using the zinc dross ore pulp containing zinc oxide, first
Hydraulic pressure is filtered to obtain filtrate and filter residue after absorption, and filter residue is in fluidized bed furnace, and using sulphur as fuel, filter residue is calcined at 300~400 DEG C
The mixed gas containing sulfur dioxide and the clinker containing zinc oxide are obtained, the clinker containing zinc oxide can be as the second absorbent of preparation
Feedstock circulation uses or leaches raw material as the neutral of zinc abstraction, can be real when it is recycled as the second raw sorbent
Existing the renewable of desulfurizing agent recycles, and reduces purchase cost；When its neutral leaching raw material as zinc abstraction, zinc can be improved
Yield, so as to increase the market of Business Economic Benefit and desulfurizing agent limitation.
2nd, the mixed gas containing sulfur dioxide that calcination filter residue obtains can be used for Sulphuric acid, will not cause the wasting of resources.
3rd, the thermal decomposition of zinc sulfite is carried out using sulphur, zinc sulfite is the intermediate products of this process combination, will not
Directly utilized by electrolytic zinc, therefore volume and acid plumping will not be caused, while also solved prior art and aoxidize zinc sulfite
As the problem of caused its separates and recovers after zinc sulfate.
4th, liquid recycles the utilization rate that can further improve zinc dross ore pulp as the first absorbent after two level absorbs,
Reduce production cost.
5th, can reach using the method provided by the invention that sulfur dioxide is reclaimed from flue gas, the rate of recovery of sulfur dioxide
More than 97%.
Brief description of the drawings
Fig. 1 is the process chart for the preferred embodiment of method one that the present invention reclaims sulfur dioxide from flue gas.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only the part of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining the relative position relation under a certain particular pose (as shown in drawings) between each part, motion conditions etc., if should
When particular pose changes, then directionality instruction also correspondingly changes therewith.
In addition, in the present invention such as relating to the description of " first ", " second " etc. be only used for describe purpose, and it is not intended that
Indicate or imply its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ",
At least one this feature can be expressed or be implicitly included to the feature of " second ".In the description of the invention, " multiple " contain
Justice is at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " connection ", " fixation " etc. should be interpreted broadly,
For example, " fixation " can be fixedly connected or be detachably connected, or integrally；Can be mechanically connect or
Electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be the connection or two of two element internals
The interaction relationship of individual element, limited unless otherwise clear and definite.For the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
In addition, the technical scheme between each embodiment of the present invention can be combined with each other, but must be general with this area
Logical technical staff can be implemented as basis, will be understood that when the combination appearance of technical scheme is conflicting or can not realize this
The combination of technical scheme is not present, also not within the protection domain of application claims.
The present invention provides a kind of method that sulfur dioxide is reclaimed from flue gas, and the flue gas is caused tail in smelting process
Gas, the sulfur dioxide containing low concentration, in the present embodiment, the flue gas is electrolytic zinc tail gas, 8000mg/Nm containing sulfur dioxide3,
250 DEG C of temperature.This method using zinc dross ore pulp as absorbent recovered flue gas in sulfur dioxide, after absorption hydraulic pressure filter after obtain
Filter residue, then by the filter residue, calcined to obtain the mixed gas of clinker and sulfur dioxide containing zinc oxide using sulphur as fuel,
Sulfur dioxide can be used for Sulphuric acid, and zinc oxide can return to the raw material that recovery system is used as absorbent, can also be used as zinc
The neutral of smelting leaches raw material.Specifically, referring to Fig. 1, the method bag provided by the invention that sulfur dioxide is reclaimed from flue gas
Include following steps：
Step 1: flue gas pre-processes
The purpose of flue gas pretreatment is to remove the fluorine ion and chlorion in flue gas, is entered with reducing fluorine ion and chlorion
Sulfurous acid, reduce zinc sulfite thermal decomposition and produce the influence of fluorine, chlorion to sulfate system.Specifically, former flue gas enters washing
In tower, the particulate matter, chloride, the fluoride that are removed by industrial washing water in flue gas obtain pretreated flue gas, described pre-
Fluorine, chlorinity can be down within 0.4% in flue gas after processing.
In the present embodiment, the flue gas is electrolytic zinc tail gas, 8000mg/Nm containing sulfur dioxide3, 250 DEG C of temperature.
Step 2: the preparation of zinc dross ore pulp
The method that the present invention reclaims sulfur dioxide from flue gas thinks zinc dross ore pulp as absorbent.Electrolytic zinc is in ingot casting
During produce about 2.3% zinc dross, for improve metal direct yield, it is necessary first to by zinc dross pre-process recovery crude zinc grain and
Fine metal particle, solid material of the zinc dross that then alkali cleaning, dechlorination are able to pre-process again as zinc dross ore pulp.Specifically：
1) crude zinc grain reclaims：Former zinc dross is by sieving crude zinc grain of the recovery size in more than 2mm, in this embodiment, profit
Recovery crude zinc grain is sieved with Raymond machine, the part crude zinc grain accounts for the 30-45% of the total zinc of zinc dross；
2) fine metal particle reclaims：Zinc dross after recovery crude zinc grain is passed through into shaking table gravity separation and reclaims thin metal
Grain, the part fine metal particle account for the 8-10% of the total zinc of zinc dross；
3) zinc dross that alkali cleaning, dechlorination are pre-processed：Using 3-6% sodium carbonate as alkali wash water, by liquid-solid ratio 5：1 pair
Zinc dross after recovery fine metal particle is washed, 30-60 DEG C of temperature, wash time 2~3 hours, and speed of agitator 50~
80r/min, the zinc dross that the zinc dross after alkali cleaning is complete is pre-processed using filter press progress press filtration, after alkali cleaning and dechlorination
To the zinc dross chlorinty of pretreatment be down to less than 0.4% by before processing 1.5~3%, Zn content is less than 78%.In this implementation
In example, alkaline cleaner is agitator.
4) it is 10~15 by liquid-solid ratio：1 ratio stirs evenly pretreated zinc dross and obtains zinc dross ore pulp.
Step 3: first order absorption and two level absorb the sulfur dioxide in series connection removing flue gas
Absorbed to obtain liquid after first order absorption to the pretreated flue gas of step 1 using the first absorbent, zinc oxide and
Sulfur dioxide is reacted to obtain zinc sulfite, and the gas without absorption after first order absorption separates is carried out using the second absorbent
Absorption obtains liquid after two level absorbs, wherein the second absorbent is zinc dross ore pulp prepared by step 2, liquid conduct after two level absorbs
First absorbent.Zinc dross ore pulp is squeezed into absorption cycle pond, circulation fluid remains that pH4.5-5.3 is circulated, transports to one
Liquid absorbs as the first absorbent to pretreated flue gas after the two level on level absorption tower absorbs, its pH3.5-4.5, desulfurization
Efficiency is up to 97%.Big portion has been absorbed the sulfur dioxide in flue gas due to entering second absorption tower in the first absorption tower
Entirely, the second absorbent and not up to saturation, absorb to being re-used as first after the gas without absorption after first order absorption separates
Absorbent uses, and can increase operation rate.In the present embodiment, the device that first order absorption and two level absorb is absorption tower, wherein
The air inlet on absorption tower is located at its lower end, and inlet is provided thereon end, and gas and liquid countercurrent contact are completed to absorb.
Further, in addition to Alkali absorption step.Detecting the gas without absorption after two level absorption and separation
In content of sulfur dioxide when being more than discharge standard, then the flue gas come out from two-level absorption tower is again introduced into Alkali absorption device, with
Sodium carbonate is that absorbing liquid further absorbs to sulfur dioxide, to meet the discharge standard of sulfur dioxide, reduces air pollution.
In the present embodiment, in SO 2 from fume content>400mg/Nm3Shi Qidong Alkali absorption steps.
Handle to obtain filtrate and filter residue Step 4: carrying out press filtration
Liquid carries out press filtration and obtains filtrate and filter residue after the first order absorption that step 3 is obtained, filtrate return first grade absorption tower or
Two-level absorption tower is recycled, and Sewage Disposal is entered when Zn content reaches 500-800mg/l using sodium carbonate recovery zinc；Filter
Slag is zinc sulfite.
Step 5: filter residue thermally decomposes desulfurization
Using sulphur as fuel, the filter residue that step 4 obtains is calcined at 300~400 DEG C, obtained mixed containing sulfur dioxide
Gas and the clinker containing zinc oxide are closed, the content of sulfur dioxide of the mixed gas obtained after calcination is 12~17%.
Step 6: recovery sulfur dioxide
The mixed gas containing sulfur dioxide that step 5 is obtained is used for Sulphuric acid.
Step 7: recovery zinc oxide
As the solid material of zinc dross ore pulp prepared by the filter residue containing zinc oxide that step 5 obtains into the second absorbent to follow
Ring uses or directly extracts zinc as the neutral raw material that leaches of zinc abstraction.
In the present embodiment, the label of each step is used only for simplifying statement, does not limit the time order and function between each step
Sequentially.
Present invention simultaneously provides a kind of system that sulfur dioxide is reclaimed from flue gas, the system is prepared including zinc dross ore pulp
Device, scrubbing tower, first grade absorption tower, two-level absorption tower, the first filter press and fluidized bed furnace, the zinc dross ore pulp preparation facilities bag
Include be sequentially connected be used to sieve reclaim coarse grained Raymond machine, fine grain shaking table reclaimed for gravity separation, agitator, the
Two filter presses and absorbent circulatory pool.
The connected mode of the system of sulfur dioxide is reclaimed from flue gas：
(1) air inlet of the former flue in scene and scrubbing tower connects, the inlet connection of industrial waterpipe and scrubbing tower；
(2) air inlet of the gas outlet of scrubbing tower and first grade absorption tower is connected, and gas outlet and the two level of first grade absorption tower are inhaled
The air inlet connection of tower is received, the inlet of first grade absorption tower and the liquid outlet of two-level absorption tower connect, and first grade absorption tower goes out liquid
Mouthful be connected with the first filter press, the gas outlet of two-level absorption tower is connected with tail gas exhausting pipeline, the inlet of two-level absorption tower and
The liquid outlet connection of absorbent circulatory pool；
(3) for Raymond machine screening recovery size in more than 2mm crude zinc grain, below 2mm's reclaims thin again by shaking table
Grain, what is be not recovered is inserted in agitator, and the liquid outlet of agitator is connected with the inlet of the second filter press, the second filter press
Sludge outlet is connected with the charging aperture of absorbent circulatory pool；
The liquid outlet of (4) first filter presses is connected with the inlet of absorbent circulatory pool, the sludge outlet of the first filter press
It is connected with the charging aperture of fluidized bed furnace, the gas outlet of fluidized bed furnace is connected with exporting the pipeline for the mixed gas for including sulfur dioxide, is boiled
The discharging opening for rising stove is connected with the charging aperture of absorbent circulatory pool.
The method that the present invention reclaims sulfur dioxide from flue gas is specific as follows：
Former flue gas (8000mg/Nm containing sulfur dioxide3, 250 DEG C of temperature) remove fluorine ion, chlorion into scrubbing tower after,
Enter from the air inlet of first grade absorption tower lower end, inlet of the first absorbent (pH value 3.5~4.5) from first grade absorption tower upper end
Liquid after absorbing to obtain first order absorption by the first absorbent into, sulfur dioxide in pretreated flue gas, liquid after first order absorption
Into the first filter press, the filter residue obtained by the first filter press press filtration (the sulfurous acid cadmia containing zinc about 35~45%), enter
Fluidized bed furnace, using sulphur as fuel, at 300~400 DEG C being calcined filter residue obtains the mixed gas containing sulfur dioxide (sulfur dioxide contains
Measure as 12~17%) and clinker containing zinc oxide, the mixed gas of sulfur dioxide is used for Sulphuric acid, and the clinker containing zinc oxide is made
Solid material for the second absorbent recycles or leaches raw material as the neutral of zinc abstraction；After first order absorption separates
Gas without absorption reabsorbs into two-level absorption tower, and zinc dross ore pulp enters as the second absorbent from two-level absorption tower upper end
Enter, liquid recycles in two-level absorption tower after two level absorbs, when its pH value is 3.5~4.5, as the first absorbent from one-level
The upper end on absorption tower enters in first grade absorption tower；Tail gas after two level absorption and separation is expelled directly out or filled again by Alkali absorption
Put the sulfur dioxide absorbed in tail gas and reach safety dumping standard.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
- A kind of 1. method that sulfur dioxide is reclaimed from flue gas, it is characterised in that the side that sulfur dioxide is reclaimed from flue gas Method comprises the following steps：Step 1: flue gas pre-processesFormer flue gas enters in scrubbing tower obtains pre- place by the particulate matter in industry water washing removing flue gas, chloride, fluoride Flue gas after reason；Step 2: first order absorption and two level absorb the sulfur dioxide in series connection removing flue gasAbsorbed to obtain liquid after first order absorption to pretreated flue gas using the first absorbent, using the second absorbent to warp The gas without absorption after first order absorption separation is absorbed to obtain liquid after two level absorbs, wherein the second absorbent is zinc dross Ore pulp, liquid is as the first absorbent after two level absorbs；Handle to obtain filtrate and filter residue Step 3: carrying out press filtrationLiquid carries out press filtration and obtains filtrate and filter residue after the first order absorption that step 2 is obtained, and the filter residue is zinc sulfite；Step 4: filter residue thermally decomposes desulfurizationUsing sulphur as fuel, the filter residue that step 3 obtains is calcined at 300~400 DEG C, obtains the gaseous mixture containing sulfur dioxide Body and the clinker containing zinc oxide.
- 2. the method according to claim 1 that sulfur dioxide is reclaimed from flue gas, it is characterised in that described to be returned from flue gas Receiving the method for sulfur dioxide also includes：Step 5: recovery zinc oxideUsed the clinker containing zinc oxide that step 4 obtains as the feedstock circulation for preparing the second absorbent or as zinc smelting The neutral of refining leaches raw material.
- 3. the method according to claim 1 that sulfur dioxide is reclaimed from flue gas, it is characterised in that described to be returned from flue gas Receiving the method for sulfur dioxide also includes：Step 6: recovery contains sulfur dioxideThe mixed gas containing sulfur dioxide that step 4 is obtained is used for Sulphuric acid.
- 4. the method according to claim 1 that sulfur dioxide is reclaimed from flue gas, it is characterised in that second absorbent It is 10~15 for liquid-solid ratio：1 zinc dross ore pulp.
- 5. the method according to claim 4 that sulfur dioxide is reclaimed from flue gas, it is characterised in that first absorbent PH value be 3.5-4.5.
- 6. the method that sulfur dioxide is reclaimed from flue gas according to any one of claim 1 to 5, it is characterised in that described The method of sulfur dioxide is reclaimed from flue gas seven the step of also including preparing zinc dross ore pulp, specifically：Step a) zinc dross pre-processes：By sieving crude zinc grain of the recovery size in more than 2mm, the part crude zinc grain accounts for zinc dross The 30~45% of the total zinc of zinc dross, then fine metal particle is reclaimed by gravity separation, it is total that the part fine metal particle accounts for zinc dross The 8~10% of zinc, the zinc dross finally pre-processed by alkali cleaning, dechlorination, the zinc dross of the pretreatment are chloride<0.4%, It is less than 78% containing zinc；Step b) is 10~15 by liquid-solid ratio：1 ratio mixes the filtrate of water and/or step 3 and pretreated zinc dross zinc It is even to obtain zinc dross ore pulp.
- 7. the method according to claim 1 that sulfur dioxide is reclaimed from flue gas, it is characterised in that the former flue gas is electricity Solve zinc tail gas, 8000mg/Nm containing sulfur dioxide3, 250 DEG C of temperature.
- 8. the method according to claim 1 that sulfur dioxide is reclaimed from flue gas, it is characterised in that the filter residue of step 4 exists It is calcined in fluidized bed furnace.
- 9. a kind of system that sulfur dioxide is reclaimed from flue gas, its feature in, the system include scrubbing tower, first grade absorption tower, Two-level absorption tower, the first filter press and fluidized bed furnace, the gas outlet of the scrubbing tower are connected with the air inlet of the first grade absorption tower, The gas outlet of the first grade absorption tower is connected with the air inlet of the two-level absorption tower, the gas outlet of the two-level absorption tower and tail Gas delivery pipe is connected, and the liquid outlet of the two-level absorption tower is connected with the inlet of the first grade absorption tower, the first order absorption The liquid outlet of tower is connected with the inlet of the first filter press, the slag notch of first filter press and the charging aperture of the fluidized bed furnace Connection.
- A kind of 10. system that sulfur dioxide is reclaimed from flue gas according to claim 9, it is characterised in that the system Also include zinc dross ore pulp preparation facilities, what the zinc dross ore pulp preparation facilities included being sequentially connected is used to sieve thick of recovery The Raymond machine of grain, for gravity separation fine grain shaking table, agitator, the second filter press and absorbent circulatory pool are reclaimed, it is described Absorbent circulatory pool is connected with the inlet of the two-level absorption tower.
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| CN107970753A (en) * | 2018-01-17 | 2018-05-01 | 红河绿地环保科技发展有限公司 | A kind of method of wet method liquid phase classification concentrate removing sulfur dioxide in flue gas |
| CN108043189A (en) * | 2017-11-27 | 2018-05-18 | 西北矿冶研究院 | Zinc oxide combined desulfurization and denitrification system and method |
| CN109569255A (en) * | 2018-11-29 | 2019-04-05 | 株洲冶炼集团股份有限公司 | A kind of zinc abstraction system flue gas desulfurization technique |
| CN110433620A (en) * | 2019-08-21 | 2019-11-12 | 葫芦岛锌业股份有限公司 | A kind of method that zinc abstraction high temperature boiling dirt desulfurization utilizes |
| CN113044812A (en) * | 2019-12-27 | 2021-06-29 | 中石油克拉玛依石化有限责任公司 | SO reduction2Method and device for producing discharged sulfur |
| CN113663489A (en) * | 2021-08-26 | 2021-11-19 | 云南云铜锌业股份有限公司 | Treatment system and method for zinc leaching residue volatilizing kiln tail gas |
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| CN110433620A (en) * | 2019-08-21 | 2019-11-12 | 葫芦岛锌业股份有限公司 | A kind of method that zinc abstraction high temperature boiling dirt desulfurization utilizes |
| CN113044812A (en) * | 2019-12-27 | 2021-06-29 | 中石油克拉玛依石化有限责任公司 | SO reduction2Method and device for producing discharged sulfur |
| CN113663489A (en) * | 2021-08-26 | 2021-11-19 | 云南云铜锌业股份有限公司 | Treatment system and method for zinc leaching residue volatilizing kiln tail gas |
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