CN103239979A - Economical method for desulfurizing and dedusting glue gas produced during smelting of secondary lead - Google Patents
Economical method for desulfurizing and dedusting glue gas produced during smelting of secondary lead Download PDFInfo
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- CN103239979A CN103239979A CN2013101930484A CN201310193048A CN103239979A CN 103239979 A CN103239979 A CN 103239979A CN 2013101930484 A CN2013101930484 A CN 2013101930484A CN 201310193048 A CN201310193048 A CN 201310193048A CN 103239979 A CN103239979 A CN 103239979A
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- leacheate
- desulfurization
- lead
- flue gas
- lead dust
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses an economical method for desulfurizing and dedusting glue gas produced during smelting of secondary lead. The economical method comprises the following steps of: adsorbing lead dust, SO2 and SO3 first by using slightly acidic water to separate from the CO2 by using the characteristic that the dissolution and adsorption capacity of the CO2 in a slightly acidic water solution is remarkably lower than that of the lead dust, the SO2 and the SO3; then removing the lead dust by using a precipitation or centrifugal mode; and finally adding lime to carry out sulfur fixation and desulfuration. According to the method disclosed by the invention, the consumption of a desulfurizer and the desulfurization cost are reduced, and a desulfurized product cannot be subjected to secondary pollution by the lead dust and can be recycled.
Description
One, technical field
The present invention relates to the secondary lead smelting environment-protective process, specifically a kind of method of economical secondary lead smelting flue gas desulfurization and dedusting.
Two, background technology
Reclaim in the smelting process at lead-acid accumulator, owing to be adsorbed with a large amount of sulfuric acid in pole plate and the lead plaster, in containing the scrap lead smelting process, though through the desulfurization preliminary treatment, still have the sulphur-containing substance of a great deal of to be difficult to remove totally, enter smelting and will inevitably produce certain SO
2And SO
3, this SO that is rich in
2And SO
3Flue gas directly enter atmosphere if handle without desulfurization, can cause atmosphere pollution, form acid rain, the harm plant is sucked bronchus by the people and tangible irritation can appear in lung, causes cough, make damaged lung tissue, the eye contact meeting damage eye mask of shedding tears contacts sour gas for a long time and knows from experience and cause slow poisoning, makes human organism's immunity be subjected to obvious inhibition.The whole nation most secondary lead smelting enterprise majority had before all been taked the solid sulphur method desulfurization of alkali liquid washing lime, after be improved to and directly take lime/lime stone-lime paste method spray to carry out flue gas desulfurization.Two kinds of methods all exist spray akaline liquid and SO
2And SO
3Be CO a large amount of in easily alkaline and the flue gas because of liquid during reaction desulfuration
2React, the sorbent consumption amount is multiplied, desulphurization cost is huge, and actual the smelting is difficult in the production use.Though simultaneously since flue gas during smelting through multiprogramming dedustings such as gravity, pocket types, still contain the lead dust that exceeds standard in its tail gas, lead dust content surpasses 1 milligram/m3, lime/lime stone-lime paste method can be passed through the fine lead dust of lime paste (powder) spray adsorbing and removing, but the lead dust that removes with the desulfurization product calcium sulfite, calcium sulfate is mixed in together can't separate, the lead dust secondary pollution of desulfurization product makes desulfurization product be difficult to utilize, and pile up like a mountain, can not abandon everywhere again.How to reduce desulphurization cost, avoid desulfurization product secondary lead dust pollution, be related to desulfur technology and can obtain practical application.
Three, summary of the invention
The present invention aims to provide a kind of method of economical secondary lead smelting flue gas desulfurization and dedusting, to remove the SO in the secondary lead smelting flue gas
2, SO
3And lead dust, and the desulfurization and dedusting product can recycling, produces economic benefit.
The present invention utilizes lead dust, SO
2, SO
3And CO
2There is the character of notable difference in solubility in acidic aqueous solution, i.e. water insoluble, the SO of lead dust
3Easily by water absorption, SO
2Solubility is CO in water
240 times, absorb lead dust, SO by water spray
2And SO
3With CO
2Separate Deng gas, reduce the desulfurization input cost, recycling precipitation centrifugal dust-removing principle is with lead dust and SO
2And SO
3The aqueous solution separate, consolidate sulphur with an amount of quick lime at last and remove SO in the water
2, SO
3Deng sulphur-containing substance, the water cycling and reutilization of clarification, desulfurization product can be made building materials and carry out twice laid.
The method of the economical secondary lead smelting flue gas desulfurization and dedusting of the present invention comprises drip washing, takes off dirt and solid each unit process of sulphur:
Described drip washing is that the leacheate with pH value 6.5-7 sprays the secondary lead smelting flue gas, absorbs lead dust, SO
2And SO
3, the flow-rate ratio of the spray flux of leacheate and secondary lead smelting flue gas is not less than the 1:10(volume ratio), collect the leacheate after spraying, be rich in lead dust, SO in the leacheate
2And SO
3During first spray with the water of pH value 6.5-7 as leacheate, this water comprises running water, well water etc., as leacheate, additional well water got final product when the amount of filtrate was not enough with the filtrate that obtains in the solid sulphur process in normal operation back, leacheate pH value is controlled all the time at 6.5-7.
The described dirt that takes off is with the leacheate centrifugal treating behind the spray, precipitation separation and clear liquid, and precipitation is lead dust, is rich in SO in the clear liquid
2And SO
3Hydrate; The gained lead dust can reclaim smelting.
Described solid sulphur is to add quick lime in described clear liquid, stirs while adding, and mixes, and staticly settles the back isolated by filtration and namely gets desulfurization product, the leacheate when filtrate recovery is used for drip washing.The desulfurization product main component is calcium sulfate and calcium sulfite, adds compositions such as aggregate such as sandstone and lime in desulfurization product, and stirring extruding is molded, steams to press can be processed into the non-burning brick building materials of doing and use again.The addition of quick lime is looked SO in the flue gas
2And SO
3The content size determines that concrete requirement is that pH value of filtrate control is got final product at 6.5-7.
Specific implementation process of the present invention is as follows:
1, the secondary lead smelting flue gas is imported the desulfurization and dedusting tower 2 from bottom to top from smoke inlet 1, the secondary lead smelting flue gas disperses sieve 3 to be uniformly dispersed through porous, leacheate sprays the secondary lead smelting flue gas from top to bottom from waterfog head 5 atomizing ejections, lead dust in the secondary lead smelting flue gas precipitates SO downwards because of the drip washing absorption of self gravitation and leacheate
2And SO
3Absorbed CO by leacheate
2Waiting other tail gas can not be absorbed because solubility in leacheate (acidic aqueous solution) is minimum by flue 10 discharges.
2, lead dust is drained in the lead dust sedimentation basin 7 with the leacheate after spraying, staticly settle the back and form lead dust glar 12 in the bottom of lead dust sedimentation basin 7, the liquid of lead dust glar 12 tops is pumped to after centrifuge 14 removes remaining lead dust in the desulfurization sedimentation basin 16, realizes lead dust and SO
2, SO
3Separation.
3, in desulfurization sedimentation basin 16, add quick lime by the charge door 19 that mixes grey agitator 15, mix and carry out neutralization reaction, SO
2And SO
3Be transformed into desulfurization products such as calcium sulfate and calcium sulfite, form sulfur-bearing glar 17 in the bottom of desulfurization sedimentation basin 16, realize solid sulphur desulfurization.When adding quick lime, control its addition, guarantee that the filtrate pH value behind the solid sulphur is controlled between 6.5-7, only make the SO of 90-98%
2, SO
3Being cured removes, in order to recycle as leacheate, control is to CO in the flue gas
2Absorption, reduce the consumption of desulfurizing agent and efflux the environment water that causes and pollute.
The inventive method can not only desulfurization and dedusting, and the desulfurization and dedusting product can recycling, produces economic benefit.The inventive method is to innovate improvement on lime/lime stone-gypsum method desulfur technology basis, is under the prerequisite that guarantees desulfurized effect, absorbs sulfur oxide by slant acidity water and does not absorb CO
2Reach and reduce desulfurization to the consumption of lime/lime stone-lime paste, reduce desulphurization cost greatly, avoided the secondary pollution of lead dust to desulfurization product simultaneously, can realize that desulfurization product reprocessing utilizes, solve the desulfurization product problem of outlet, improve the operability of desulfurization and dedusting technology.
Effect behind the desulfurization and dedusting of the present invention reaches: tail gas contains lead dust and is lower than 0.5mg/m
3, SO
2Be lower than 50ml/m
3
Compare with existing lime/lime stone-lime paste method flue gas desulfurization, beneficial effect of the present invention is embodied in:
1, the inventive method has realized not decarburization of desulfurization, effectively reduces desulphurization cost.
2, the inventive method removes lead dust desulfurization more earlier, avoids the desulfurization product secondary pollution, guarantees that not only lead dust can reclaim for smelting, and makes desulfurization product can reprocess utilization, avoids the resource waste and pollution environment.
Four, description of drawings
Fig. 1 is desulfurating dust-removing equipment schematic diagram of the present invention.
Number in the figure: 1 smoke inlet, 2 desulfurization and dedusting towers, 3 porous are disperseed sieve, 4 spray absorption chambers, 5 waterfog heads, 6 water wash liquid, 7 lead dust sedimentation basins, 8 aqueous vapor separation chambers, 9 air-introduced machines, 10 flues, 11 chimneys, 12 lead dust glars, 13 elevator pumps, 14 centrifuges, 15 mix grey agitator, 16 desulfurization sedimentation basins, 17 sulfur-bearing glars, 18 circulating pumps, 19 charge doors.
Five, the specific embodiment
1, the secondary lead smelting flue gas is imported the desulfurization and dedusting tower 2 from bottom to top from smoke inlet 1, the secondary lead smelting flue gas disperses sieve 3 rising that is uniformly dispersed through porous, the leacheate of pH value 6.5 is from waterfog head 5 atomizing ejections, the leacheate of atomizing ejection fully contacts at spray absorption chamber 4 places with the secondary lead smelting flue gas that evenly rises, the flow-rate ratio 1:9 of the spray flux of leacheate and secondary lead smelting flue gas, lead dust in the secondary lead smelting flue gas precipitates SO downwards because of the drip washing of self gravitation and leacheate
2And SO
3Absorbed by leacheate, realize the aqueous vapor separation in the flue gas aqueous vapor separation chamber 8 after the drip washing, CO
2Minimum can not being absorbed with the flue gas after the drip washing of cause solubility in leacheate (acidic aqueous solution) directly discharged by chimney 11 by flue 10.Following reaction takes place therebetween:
SO
2＋H
2O＝H
2SO
3 SO
3+H
2O=H
2SO
4。
2, lead dust is drained in the lead dust sedimentation basin 7 with the leacheate after spraying, staticly settle the back and form lead dust glar 12 in the bottom of lead dust sedimentation basin 7, the supernatant liquid of lead dust glar 12 tops is pumped to after centrifuge 14 removes remaining lead dust in the desulfurization sedimentation basin 16, realizes lead dust and SO
2, SO
3Separation.
3, in desulfurization sedimentation basin 16, add quick lime by the charge door 19 that mixes grey agitator 15, mix and carry out neutralization reaction, SO
2And SO
3Be transformed into desulfurization products such as calcium sulfate and calcium sulfite, form sulfur-bearing glar 17 in the bottom of desulfurization sedimentation basin 16, realize solid sulphur desulfurization.The main component of sulfur-bearing glar 17 is CaSO
3, CaSO
4, can regularly extract out for the production of building materials processing recycling with sludge pump.When adding quick lime, to add gradually, guarantee that the filtrate pH value 6.5-7 behind the solid sulphur gets final product, only make the SO of 90-98%
2, SO
3Being cured removes, in order to recycle as leacheate, control is to CO in the flue gas
2Absorption, reduce the consumption of desulfurizing agent and efflux the environment water that causes and pollute.It is as follows that solid sulphur precipitation reaction takes place therebetween:
H
2SO
3+Ca(OH)
2=CaSO
3↓+2H
2O H
2SO
4+Ca(OH)
2=CaSO
4↓+2H
2O
Tail gas behind the desulfurization and dedusting of the present invention contains lead dust and is lower than 0.5mg/m
3, SO
2Be lower than 50ml/m
3
Claims (2)
1. the method for an economical secondary lead smelting flue gas desulfurization and dedusting comprises drip washing, takes off dirt and solid each unit process of sulphur, it is characterized in that operating according to the following steps:
Described drip washing is that the leacheate with pH value 6.5-7 sprays the secondary lead smelting flue gas, collects the leacheate behind the spray;
The described dirt that takes off is with the leacheate centrifugal treating behind the spray, precipitation separation and clear liquid, and precipitation is lead dust;
Described solid sulphur is to add quick lime in described clear liquid, mixes, staticly settle the back isolated by filtration and namely get desulfurization product, the leacheate when filtrate is reclaimed as drip washing, the addition of quick lime so that pH value of filtrate control get final product at 6.5-7.
2. method according to claim 1 is characterized in that:
The flow-rate ratio of the spray flux of leacheate and secondary lead smelting flue gas is not less than 1:10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310193048.4A CN103239979B (en) | 2013-05-17 | 2013-05-17 | Economical method for desulfurizing and dedusting glue gas produced during smelting of secondary lead |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310193048.4A CN103239979B (en) | 2013-05-17 | 2013-05-17 | Economical method for desulfurizing and dedusting glue gas produced during smelting of secondary lead |
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| CN103239979A true CN103239979A (en) | 2013-08-14 |
| CN103239979B CN103239979B (en) | 2015-04-22 |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109395550A (en) * | 2018-12-14 | 2019-03-01 | 安徽海螺集团有限责任公司 | It is a kind of for removing the processing system of sulfur dioxide in flue gas |
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| CN202817145U (en) * | 2012-06-15 | 2013-03-20 | 杨春晓 | Equipment for wet recovery of waste lead paste and wet manufacture of high-performance lead-acid storage battery electrode active substances |
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2013
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2388998Y (en) * | 1999-09-15 | 2000-07-26 | 吴才新 | Lead smog purifier |
| CN201168550Y (en) * | 2008-03-14 | 2008-12-24 | 尚诚德 | Novel desulfurizing dust removing chamber |
| CN201345398Y (en) * | 2009-02-23 | 2009-11-11 | 天津东邦铅资源再生有限公司 | Regeneration and utilization system for waste lead-acid storage batteries and lead-containing waste |
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| RU2455601C1 (en) * | 2011-02-28 | 2012-07-10 | Общество с ограниченной ответственностью "Ставропольский завод химических реактивов" | Plant for plumbous oxide production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109395550A (en) * | 2018-12-14 | 2019-03-01 | 安徽海螺集团有限责任公司 | It is a kind of for removing the processing system of sulfur dioxide in flue gas |
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|---|---|
| CN103239979B (en) | 2015-04-22 |
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Effective date of registration: 20170824 Address after: 236000 Xinyuan Anhui Province Jieshou City Industrial Zone Xicheng District Road Patentee after: Anhui Huachuang environmental protection equipment Technology Co. Address before: 236500 Anhui city of Fuyang Province Jieshou City Tian Ying Industrial Zone Patentee before: Shang Chengde |
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