CN101367507B - Gas removing, filtering and extracting method for waste sulphuric acid - Google Patents
Gas removing, filtering and extracting method for waste sulphuric acid Download PDFInfo
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- CN101367507B CN101367507B CN2007101414216A CN200710141421A CN101367507B CN 101367507 B CN101367507 B CN 101367507B CN 2007101414216 A CN2007101414216 A CN 2007101414216A CN 200710141421 A CN200710141421 A CN 200710141421A CN 101367507 B CN101367507 B CN 101367507B
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Abstract
The invention relates to a method for gas-depriving, filtering and concentrating the waste sulfuric acid, and comprises the following steps: the waste sulfuric acid enters into a dechloridation tower to be contacted with the air that is sent by a dechloridation fan in reversing way; the deprived chlorine gas and other waste gases can be recycled for use or can be neutralized and absorbed by lye; the waste sulfuric acid with the chlorine gas and other waste gases being deprived enters into a cycling groove that is provided with SO3<2-> so as to remove the free chlorine and the chloride; the dechloridized waste sulfuric acid is pumped by a cycling pump into a high-level groove to flow into a filter after the level difference stabilization; the waste sulfuric acid with the foreign matters and the suspended substances being removed is mixed with the high-concentration sulfuric acid to be the finished acid or flows into a sulfuric acid absorption system to be concentrated to the finished acid; a slag pulp groove is arranged below the filter, and the slag pulp that is discharged periodically is discharged into a neutralization pool after being precipitated to be neutralized with the lye and to be discharged. The present invention has the advantages of low energy consumption, reasonable and compact process flow procedures, low cost, strong operability, high safety, large benefit, and the like. The method can be widely applied to the recycling application of the waste sulfuric acid that is produced in different enterprises, and is particularly applicable to the chlor-alkali enterprises and the sulfuric acid enterprises.
Description
Technical field
The present invention relates to a kind of gas removing, filtering and extracting method for waste sulphuric acid, particularly a kind of sulfur waste acid is removed behind the chloride gas such as grade and is removed micro free chlorine and muriate, through putting forward the technology of dense finished acid.
Background technology
At present; Many industries all can produce sulfur waste acid; Industries such as chemical industry, national defence, metallurgy, medicine, oil, textile printing and dyeing for example, concerning chemical industry chlor-alkali enterprise, chlorine hydrogen workshop section dry chlorine gas can produce sulfur waste acid; Generally all do not take to reclaim technology to the sulfur waste acid that produces and recycle, all sell at a bargain with 50～80 yuan of/ton useless vitriolic prices.The major cause of not recycling is: contain chlorine in (1) sulfur waste acid, deal with improperly and can form a kind of strong acid, safety performance is low; (2) acid is reclaimed to sulfur waste, and its bunkerage and acid delivering pipeline material can't guarantee, because sulfur waste acid also is the very strong acid of a kind of corrodibility, it with a lot of materials chemical action can take place, and produces vitriol, the etching apparatus pipeline.
Concerning non-chlor-alkali enterprise produces the producer of sulfur waste acid; Adopt following technology mostly: earlier sulfur waste acid is removed impurity by filter; Sulfur waste acid after the filtration gets into tantalum material evaporimeter, uses the steam of >=25 kilograms of pressure to concentrate, and is treated to 93% or 98% finished acid.This process method is carried out under HTHP, and required cooling decompression equipment is many, complex process, and the sulfuric acid temperature after concentrating simultaneously is high; Very strong to equipment corrosion, and tantalum material vaporizer costs an arm and a leg, and causes this technology investment big; Energy consumption is big, and cost is high, and safety performance is low.
Summary of the invention
The objective of the invention is to solve shortcomings such as there is complex process in original technique, investment is big, energy consumption is big, cost is high and safety performance is low, and then a kind of a kind of gas removing, filtering and extracting method for waste sulphuric acid that consumes energy is low, technical process is rationally compact, cost is low, workable, safety performance is high and income is big that has is provided.
For achieving the above object, the present invention adopts following technical scheme:
A kind of gas removing, filtering and extracting method for waste sulphuric acid comprises the step of being undertaken by following order:
(1) sulfur waste acid contact with air inversion that the dechlorination blower fan is sent here in the storage tank pump gets into the dechlorinator, removes waste gas, the waste gas that removes recycle or with alkali lye in and absorption;
(2) the sulfur waste acid of removal chlorine gets into circulation groove, in circulation groove, adds SO
3 2-Remove the free chlorine and the muriate of trace;
(3) send in the header tank by recycle pump through removing free chlorine and muriatic sulfur waste acid;
(4) acid of the sulfur waste in the header tank gets into strainer and removes impurity and suspended substance;
(5) the filtration sulfuric acid of removing impurity and suspended substance is blended into finished acid or gets into the sulfuric acid absorption system through the sulfuric acid with high density to be carried dense to finished acid;
(6) strainer has the slag stock tank, and the slag of regular discharge slurry carries out sedimentation through the slag stock tank, the slag slurry after the sedimentation enter in the neutralization tank with alkali lye in and discharging.
Above-mentioned gas removing, filtering and extracting method for waste sulphuric acid, the outlet of said header tank are higher than filter inlet and the two potential difference is 6～9 meters, to guarantee stable flow velocity, reduces the life-span of filtering membrane.
Add SO in the above-mentioned gas removing, filtering and extracting method for waste sulphuric acid, said circulation groove
3 2-With the acid of 1 ton of sulfur waste of every processing to be added consumption be 10g＜SO
3 2-＜500g makes the muriate complete oxidation.
Above-mentioned gas removing, filtering and extracting method for waste sulphuric acid; The sulfur waste acid residence time is controlled at and made that chloride content is 0.0001～0.0005% in the sulfur waste acid in 10～20 seconds in the described entering dechlorinator; Sulfur waste acid from transportation means directly gets into the dechlorinator or is introduced into the sulfur waste acid storage tank again through storage tank pump entering dechlorinator through the storage tank pump, and road vehicle is any vehicle.
Above-mentioned gas removing, filtering and extracting method for waste sulphuric acid, described dechlorination compressor flow 1000～5268m
3/ h.
Above-mentioned gas removing, filtering and extracting method for waste sulphuric acid, the dechlorination sulfuric acid of described entering strainer, its filtration velocity is 0.1～1.5m
3/ m
2Hr.
Above-mentioned gas removing, filtering and extracting method for waste sulphuric acid, chloride content 0.01～0.5% in the described sulfur waste acid, suspended substance solid content be at 15～1000ppm, transparency 20～100mm; Finished acid chloride content 0%, suspended substance solid content＜10ppm, transparency >=200mm.
Above-mentioned gas removing, filtering and extracting method for waste sulphuric acid, the chlorine that described dechlorinator removes can get in the chlorine hydrogen dry treatment process, further recycle, and reduce environmental pollution.
Above-mentioned gas removing, filtering and extracting method for waste sulphuric acid, described sulfur waste acid gets into absorption system in the sulfuric acid plant production technique, the add-on of alternative techniques water, conserve water resource.
Above-mentioned gas removing, filtering and extracting method for waste sulphuric acid, described sulfur waste acid gets into absorption system in the sulfuric acid plant production technique, the add-on of alternative techniques water, conserve water resource.
In the technique scheme, the implication of span be more than or equal to or smaller or equal to endpoint value, for example the import of the outlet of header tank and strainer differ 6～9 meters promptly more than or equal to 6, smaller or equal to 9 meters.
The present invention increases sulfur waste acid in the useless vitriolic technology of generation to remove the gas filtration extracting and concentrating technology in existing enterprise production; Technical process is rationally compact, on the one hand chlorine and sulfur waste acid recovery is utilized, and then has reduced energy consumption; Improve benefit, reduced the pollution to environment such as waste gas simultaneously.The present invention can be widely used in the useless vitriolic recycling that various enterprises produce, and is specially adapted to chlor-alkali enterprise and sulfuric acid enterprise, also can carry out individual curing to useless vitriolic certainly.
The present invention has following advantage specifically:
1, do not relate to energy steam in the technological process of the present invention, just can realize the environmental protection purpose of " utilization of waste material, raising the output subtracts dirt ".
2, the present invention utilizes the original process characteristic of sulfuric acid plant, and process design is rationally compact, and equipment reuses and is non-pressure vessel; For prolonging the work-ing life of filter film, the header tank of having set up 6～9 meters potential differences gets into strainer with stable flow velocity, has reduced the investment of strainer pump.
3, the required production cost of 1 ton/sulfur waste of art breading of the present invention acid is 50～70 yuan; The steam concentration technology is handled 200～250 yuan of the required production costs of 1 ton/sulfur waste acid; Finished acid price after the processing is 350～500 yuan/ton (by nearly 3 years sale average price); The acid of the sulfur waste of recycling has not improved economic benefit greatly all with 50～80 yuan/ton sell at competitive.
4, the present invention is directed to gases such as chlorine contained in the sulfur waste acid has certain influence to catalyst in the convertor in the sulfate system, reduces its work-ing life and a kind of technology of adopting, and making the chloride content in the sulfur waste acid is 0%, and process safety is effective.
Below in conjunction with enforcement and accompanying drawing the present invention is described further.
Description of drawings
Fig. 1 is the process frame chart of the embodiment of the invention 1.
Among Fig. 1,1. sulfur waste acid storage tank, 2. storage tank pump, 3. dechlorination blower fan, 4. dechlorinator, 5. circulation groove, 6. recycle pump, 7. header tank, 8. strainer, 9. absorption tower, 10. slag stock tank, 11. neutralization tanks.
Embodiment
Embodiment 1:
With reference to accompanying drawing 1, and the sulfur waste acid in the sulfur waste acid storage tank (1) (muriate 0.1%, suspended substance solid content SS is about 800ppm; Transparency 50mm) gets into dechlorinator (4) through storage tank pump (2); Dechlorinator's layer is high approximately 2.5 meters, and the air inversion of sending here with dechlorination blower fan (3) contacts, compressor flow 2600m
3/ h; Sulfur waste acid was controlled at 15 seconds at the dechlorination dwell time in the tower; Make that chloride content is 0.0002% in the sulfur waste acid; The chlorine that comes out from dechlorinator top returns (chlor-alkali enterprise chlorine treatment plant) the chlorine hydrogen dry treatment process, and the sulfur waste that comes out from dechlorinator bottom acid gets into circulation groove (5), in circulation groove, adds SO
3 2-With the acid of 1 ton of sulfur waste of every processing to be added consumption be 200g; Remove micro free chlorine and muriate; Making the chloride content in the sulfur waste acid is 0%, and dechlorination sulfuric acid gets into header tank (7) through recycle pump (6), and the header tank outlet is higher than 8 meters of filter inlet; Dechlorination sulfuric acid gets into strainer (8) with stable flow velocity, and filtration velocity is 0.9m
3/ m
2Hr removes impurity and suspended substance, makes suspended substance solid content＜10ppm in the sulfur waste acid; Transparency is 200mm, and the sulfuric acid after the filtration returns in the sulfuric acid plant absorption tower (9), carries the dense qualified finished product sulfuric acid that becomes through absorption system; Middle filtrator of the present invention (8) bottom is provided with the deslagging outlet, and strainer regularly carries out deslagging and recoil, is disposed to slag stock tank (10) and carries out sedimentation; Before deslagging next time, settled slag slurry is entered neutralization tank (11), with in the alkali lye in the neutralization tank and discharging.Present embodiment is used in chlor-alkali enterprise and sulfuric acid enterprise.
Embodiment 3 is with embodiment 1 difference: the sulfur waste acid (muriate 0.5% in the sulfur waste acid storage tank (1); Suspended substance solid content SS is at 1000ppm; Transparency 100mm) gets into dechlorinator (4) through storage tank pump (2); Dechlorinator's layer is high approximately 2.5 meters, and the air inversion of sending here with dechlorination blower fan (3) contacts, and compressor flow is 5268m
3/ h, sulfur waste acid was controlled at 20 seconds at the dechlorination dwell time in the tower, made that chloride content is 0.0005% in the sulfur waste acid; If chloride content does not reach requirement then returns the sulfur waste acid storage tank and continue dechlorination in the sulfur waste acid, and the dechlorination time was controlled at 2 hours, mainly is that Xinjiang temperature in winter is low; Circulate for waste gas such as chlorine are better removed once more, the sulfur waste acid of coming out from the dechlorinator bottom gets into circulation groove (5), in circulation groove, adds SO32-with 1 ton of sulfur waste consumption that acid is added of every processing to be＜500g; Remove micro free chlorine and muriate; Making the chloride content in the sulfur waste acid is 0%, and dechlorination sulfuric acid gets into header tank (7) through recycle pump (6), with the potential difference of strainer be 9 meters; Get into strainer (8) with stable flow velocity, filtration velocity is 1.5m
3/ m
2Hr removes impurity and suspended substance, makes suspended substance solid content＜10ppm in the sulfur waste acid; Transparency>=200mm, the sulfuric acid after the filtration return in the sulfuric acid plant absorption tower (9), carry the dense qualified finished product sulfuric acid that becomes through absorption system; Middle filtrator of the present invention (8) bottom is provided with the deslagging outlet, and strainer regularly carries out deslagging and recoil, is disposed to slag stock tank (10) and carries out sedimentation; Before deslagging next time, settled slag slurry is entered neutralization tank (11), with in the alkali lye in the neutralization tank and discharging.
Embodiment 4 is with embodiment 1 difference: the further processing employing of the chlorine that comes out from dechlorinator top and the alkali lye with the scheme of absorption.
Above-mentioned gas removing, filtering and extracting method for waste sulphuric acid can use separately also and can be used in combination with the multiple enterprise useless original technology of vitriolic of generation.
Claims (1)
1. application number: 2007101414216
Patent of invention title: gas removing, filtering and extracting method for waste sulphuric acid
Suggestion to examination proposes is answered:
Claims 1
1, a kind of gas removing, filtering and extracting method for waste sulphuric acid is characterized in that comprising the step of being undertaken by following order:
(1) sulfur waste acid contact with air inversion that the dechlorination blower fan is sent here in the storage tank pump gets into the dechlorinator and removes waste gas, and the while adds SO in circulation groove
3 2-, make that chloride content is 0.0001～0.0005% in the sulfur waste acid;
(2) the sulfur waste acid of removal chlorine gets into circulation groove, in circulation groove, adds SO
3 2-Remove the free chlorine and the muriate of trace, make that chloride content is 0% in the sulfur waste acid;
(3) sent in the header tank by recycle pump through removing free chlorine and muriatic sulfur waste acid, the outlet of header tank is higher than filter inlet and the two potential difference is 6～9 meters;
(4) acid of the sulfur waste in the header tank gets into strainer and removes impurity and suspended substance, suspended substance solid content＜10ppm, transparency >=200mm;
(5) the filtration sulfuric acid of removing impurity and suspended substance is through further handling to finished acid;
(6) strainer has the slag stock tank, and the slag of regular discharge slurry carries out sedimentation through the slag stock tank, the slag slurry after the sedimentation enter in the neutralization tank with alkali lye in and discharging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101414216A CN101367507B (en) | 2007-08-17 | 2007-08-17 | Gas removing, filtering and extracting method for waste sulphuric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101414216A CN101367507B (en) | 2007-08-17 | 2007-08-17 | Gas removing, filtering and extracting method for waste sulphuric acid |
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| Publication Number | Publication Date |
|---|---|
| CN101367507A CN101367507A (en) | 2009-02-18 |
| CN101367507B true CN101367507B (en) | 2012-07-11 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104474848A (en) * | 2014-11-17 | 2015-04-01 | 云南华联锌铟股份有限公司 | Comprehensive utilization method of contaminated acid of sulfide ore roasting acid making system |
| CN104497045B (en) * | 2014-12-23 | 2016-04-20 | 南宁化工股份有限公司 | A kind of method of trichoro-aldehyde Waste Sulfuric Acid purification |
| CN104826364B (en) * | 2015-04-15 | 2016-07-06 | 聊城市鲁西化工工程设计有限责任公司 | A kind of air scavenging method Waste Sulfuric Acid dechlorinator and Waste Sulfuric Acid chlorine removal methods |
| CN104891450A (en) * | 2015-05-27 | 2015-09-09 | 芜湖融汇化工有限公司 | Method for removing free chlorine in dilute sulfuric acid |
| CN106044723B (en) * | 2016-05-31 | 2018-07-06 | 安徽八一化工股份有限公司 | The method for removing free chlorine in the Waste Sulfuric Acid that dry chlorine process generates |
| CN106276816B (en) * | 2016-08-15 | 2018-06-12 | 新疆中泰创安环境科技股份有限公司 | The vacuum dechlorination method of purification and its dedicated unit of ion film caustic soda by-product dilute sulfuric acid |
| CN106186135A (en) * | 2016-08-30 | 2016-12-07 | 安徽八化工股份有限公司 | Waste sulfuric acid containing chlorine dechlorination apparatus |
| CN106517104A (en) * | 2016-12-13 | 2017-03-22 | 攀枝花钢企欣宇化工有限公司 | Method for removing free chlorines from waste industrial sulfuric acid |
| CN108706557A (en) * | 2018-07-09 | 2018-10-26 | 陕西高科环保科技有限公司 | A kind of sulfur waste acid-restoring plant and its recovery method |
| CN110872716B (en) * | 2018-09-04 | 2021-01-08 | 中国科学院过程工程研究所 | Method for removing chloride ions in sulfuric acid solution containing chlorine by adopting photocatalytic fluidized bed |
| CN110294461B (en) * | 2019-07-09 | 2023-12-05 | 浙江工程设计有限公司 | Adjustable sulfuric acid dechlorination process and dechlorination tower |
| CN110921631A (en) * | 2019-11-27 | 2020-03-27 | 石河子天域新实化工有限公司 | Process method for preparing sodium hypochlorite from waste sulfuric acid residual chlorine |
| CN114229802B (en) * | 2021-12-16 | 2024-01-16 | 安徽华塑股份有限公司 | Concentration method of dilute sulfuric acid in chlorine drying process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1376635A (en) * | 2002-05-09 | 2002-10-30 | 四川龙蟒集团有限责任公司 | Process for preparing phosphoric acid from waste sulfuric acid as by-product of titanium oxide powder by wet method |
| CN1376633A (en) * | 2002-05-09 | 2002-10-30 | 四川龙蟒集团有限责任公司 | Process for concentrating diluted sulfuric acid and removing impurities |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1376635A (en) * | 2002-05-09 | 2002-10-30 | 四川龙蟒集团有限责任公司 | Process for preparing phosphoric acid from waste sulfuric acid as by-product of titanium oxide powder by wet method |
| CN1376633A (en) * | 2002-05-09 | 2002-10-30 | 四川龙蟒集团有限责任公司 | Process for concentrating diluted sulfuric acid and removing impurities |
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| CN101367507A (en) | 2009-02-18 |
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