CN104016311B - A kind of dense spent acid produces sulfuric acid purification unstripped gas system - Google Patents
A kind of dense spent acid produces sulfuric acid purification unstripped gas system Download PDFInfo
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- CN104016311B CN104016311B CN201410267398.5A CN201410267398A CN104016311B CN 104016311 B CN104016311 B CN 104016311B CN 201410267398 A CN201410267398 A CN 201410267398A CN 104016311 B CN104016311 B CN 104016311B
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- sulfuric acid
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- 239000002253 acid Substances 0.000 title claims abstract description 86
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 238000000746 purification Methods 0.000 title claims abstract description 25
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000002309 gasification Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000006479 redox reaction Methods 0.000 claims abstract description 32
- 239000005864 Sulphur Substances 0.000 claims abstract description 31
- 238000011084 recovery Methods 0.000 claims abstract description 28
- 239000007787 solid Substances 0.000 claims abstract description 19
- 239000006200 vaporizer Substances 0.000 claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 15
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 7
- 239000007790 solid phase Substances 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 230000002829 reductive effect Effects 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 60
- 238000006243 chemical reaction Methods 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 15
- 239000003546 flue gas Substances 0.000 claims description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 239000011593 sulfur Substances 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 239000002910 solid waste Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 6
- 239000012071 phase Substances 0.000 claims description 6
- 239000000567 combustion gas Substances 0.000 claims description 5
- 239000010802 sludge Substances 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000012495 reaction gas Substances 0.000 claims description 3
- 239000008247 solid mixture Substances 0.000 claims description 3
- -1 temperature improves Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 238000005406 washing Methods 0.000 abstract description 4
- 238000004090 dissolution Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000002918 waste heat Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000005201 scrubbing Methods 0.000 description 3
- 230000029936 alkylation Effects 0.000 description 2
- 238000005804 alkylation reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- MVEOHWRUBFWKJY-UHFFFAOYSA-N 7-hydroxynaphthalene-2-sulfonic acid Chemical compound C1=CC(S(O)(=O)=O)=CC2=CC(O)=CC=C21 MVEOHWRUBFWKJY-UHFFFAOYSA-N 0.000 description 1
- 239000005997 Calcium carbide Substances 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
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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
- Y02P20/10—Process efficiency
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- Industrial Gases (AREA)
- Treating Waste Gases (AREA)
Abstract
A kind of dense spent acid produces sulfuric acid purification unstripped gas system, belongs to spent acid process and gas washing in SA production field.Be take sulphur as reductive agent, dense spent acid is that oxygenant carries out Some redox reaction production sulfuric acid purification unstripped gas, spent acid the supplying gas decomposition further of unreacted high solids content, and element sulphur in waste acid recovery, is separated solid phase slag in spent acid; Comprise temperature control gasification decomposition process, redox reaction operation, energy recovery operation and sulphur dissolution process.The invention has the beneficial effects as follows: (1), by adding sulphur, redox reaction occurs, and the spent acid amount entering vaporizer declines to a great extent, and effectively reduces Carbureted heat energy consumption; Significantly improve the output of raw gas of sulfuric acid; (2) temperature control gasification is lower than high-temperature gasification gasification temperature, and energy consumption is low; (3) energy recovery is abundant; (4) useless solid with the discharge of dry solid slag form, decrease pollution.
Description
Technical field
The invention belongs to spent acid solution process field and gas washing in SA production field.The present invention relates to a kind of dense spent acid and produce sulfuric acid purification unstripped gas system.
Background technology
Some industrial production use sulfuric acid to produce dense spent acid, as gas mixture drying acid in calcium carbide process PVC production and acetylene cleaning acid, all produce the black Waste Sulfuric Acid of high density (concentration is 70% ~ 95%), black sticky, the composition complexity of its outward appearance, be difficult to recycle, cause very large pressure to ecological, environmental protective.
Patents about dense spent acid has:
CNl751984 discloses a kind of Waste Sulfuric Acid Pintsch process, adiabatic humidification acid-scrubbing cleaning, double conversion and double absorption technique, i.e. treatment technology of producing sulfuric acid from alkylated spent sulfuric acid through high temperature decomposition, divide spent acid cracking purification section, conversion section, dry absorption section three part, by spent acid treatment process, make Waste Sulfuric Acid cracking under 1000 ~ 1100 DEG C of high temperature, through acid-scrubbing cleaning, twice contact process transforms and twice absorption, produce qualified sulfuric acid product, reuse for alkyl plant, reach the object of protection of the environment simultaneously, the raw material that this technological process uses is the waste sulfuric acid from alkylation of single 85 ~ 90%, the Waste Sulfuric Acid rate of recovery can reach 90%.
This patent solves the recovery problem of the waste sulfuric acid from alkylation of single 85 ~ 90% well, but this technique exists following problem: (1) spent acid pyrolyzer directly sprays acid gasization easily makes fuel gas buring unstable, not exclusively; (2) Pintsch process gas is through waste heat boiler, and temperature is down to 350 DEG C, easily causes local acid gas condensation, corrosion waste heat boiler; (3), after waste heat boiler reclaims heat, directly adopt weak acid scrubbing cooling, fail to make full use of this partial heat energy, also therefore will increase the amount of useless diluted acid; (4) cool with inter cooler further after dilute acid wash, inter cooler equipment is large, and heat transfer efficiency is low.
CNl02745653A discloses a kind of dense spent acid and produces sulfuric acid purification unstripped gas technique, for the energy with coal-fired or combustion gas, to be dewatered operation by high-temperature gasification decomposition, waste heat recovery, purification and cooling, the gas after dewatering send the drying of gas washing in SA production, conversion and absorption operation to produce sulfuric acid.
It is reasonable that this patent has process design, and high-temperature gasification is stablized, anacidity gas condensate corrosion waste heat boiler, and heat energy utilization is abundant, and waste acidity recovery rate is high, the advantage that heat and mass efficiency is high.But spent acid is still whole gasification, heat of gasification is comparatively large, and energy consumption still leaves some room for improvement.
Summary of the invention
The object of the present invention is to provide a kind of comprehensive recovering process of dense spent acid (concentration >=70%), reduce energy consumption further, produce sulfuric acid purification unstripped gas more.
A kind of dense spent acid produces sulfuric acid purification unstripped gas system, be take sulphur as reductive agent, dense spent acid is that oxygenant carries out Some redox reaction production sulfuric acid purification unstripped gas, spent acid the supplying gas decomposition further of unreacted high solids content, element sulphur in waste acid recovery, is separated solid phase slag in spent acid; Comprise temperature control gasification decomposition process, redox reaction operation, energy recovery operation and sulphur dissolution process.
Described temperature control gasification decomposition process is made up of combustion unit, flue, vaporizer;
Described redox reaction operation is made up of Venturi reaction mixer, Reaction Separation device and high solid waste acid pump;
Described energy recovery operation is made up of venturi mixer, separator and hot spent acid pump;
Described sulphur melts operation and is made up of sulfur melting kettle and melt pump.
The dense spent acid of one of application the application produces sulfuric acid purification unstripped gas system, comprises the following steps:
A, sulphur melt
In sulfur melting kettle, melt sulphur with the spent acid of heat, in sulfur melting kettle, liquidus temperature controls at 110 ~ 150 DEG C, uses melt pump delivery to redox reaction operation after molten sulphur;
B, redox reaction
The reaction compound that melt pump delivery is come enters the throat of Venturi reaction mixer, and containing SO
3flue gas mixing, reaction compound absorb SO
3gas, sulfuric acid concentration is improved, the heat of simultaneously stability flue gas, and temperature is raised, and under the vitriol oil atmosphere of heat, anti-raw redox reaction, produces and obtain SO
2; In Reaction Separation device, further redox reaction occurs and realize gas-liquid separation, reaction gas phase send energy recovery operation, the high solid concentrated acid pumping temperature control gasification process of liquid-solid mixture after reaction;
The gasification of c, temperature control is decomposed
With coal-fired or combustion gas for the energy, burn in combustion unit, high-temperature flue gas enters vaporizer by flue, gas approach temperature 600 ~ 900 DEG C in vaporizer, and temperature out is adjusted to 300 ~ 500 DEG C; High solid waste acid spraying and smoke contacts in vaporizer that high solid Countermeasure of Concentrated Acid Pump is sent here, the anti-raw gasification separation of spent acid of high solids content, gasification gas phase send redox operation, and solid phase is that acid sludge is from vaporizer bottom discharge;
D, energy recovery and purification
A small amount of acid gas is contained in the raw gas of sulfuric acid that redox reaction operation produces and flue gas gas mixture, mix with the dense spent acid of input in venturi mixer, mixture temperature reduces, in gas mixture, a small amount of acid gas is absorbed, meanwhile, the dense waste acidity recovery heat energy of gas mixture, temperature improves, material realizes gas-liquid separation in the separator, and the raw gas of sulfuric acid of purification send subsequent process; The hot spent acid pump delivery of liquid phase melts operation to sulphur.
The present invention be embodied in following some:
(1) by adding sulphur, redox reaction occurs, and the spent acid amount entering vaporizer declines to a great extent, and effectively reduces Carbureted heat energy consumption; Significantly improve the output of raw gas of sulfuric acid;
(2) temperature control gasification is lower than high-temperature gasification gasification temperature, and energy consumption is low; Ensure that the sulfuric acid concentration of redox reaction operation especially, thus ensure carrying out smoothly of redox reaction;
(3) energy recovery is abundant, and redox reaction operation is carried out under the prerequisite absorbing flue gas heat, also purified flue gas while absorbing heat; Reclaim heat further with the dense spent acid of raw material, also purify gas washing in SA production unstripped gas further simultaneously.
(4) useless solid with the discharge of dry solid slag form, decrease pollution and be also convenient to further process.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention
1-combustion unit in Fig. 1,2-flue, 3-vaporizer, 4-Venturi reaction mixer, 5-Reaction Separation device, 6-high solid waste acid pump, 7-venturi mixer, 8-separator, the hot spent acid pump of 9-, 10-sulfur melting kettle, 11-melt pump; A-air, B-fire coal or combustion gas, C-purifies unstripped gas, the dense spent acid of D-, E-sulphur, F-acid sludge G.
Following embodiment is described further production technique of the present invention by reference to the accompanying drawings.
Embodiment
EXAMPLE l
With reference to figure l, a kind of dense spent acid produces sulfuric acid purification unstripped gas system, take sulphur as reductive agent, dense spent acid is that oxygenant carries out Some redox reaction production sulfuric acid purification unstripped gas, spent acid the supplying gas decomposition further of unreacted high solids content, element sulphur in waste acid recovery, is separated solid phase slag in spent acid; Comprise temperature control gasification decomposition process, redox reaction operation, energy recovery operation and sulphur dissolution process.
Described temperature control gasification decomposition process is made up of combustion unit l, flue 2, vaporizer 3;
Described redox reaction operation is made up of Venturi reaction mixer 4, Reaction Separation device 5 and high solid waste acid pump 6;
Described energy recovery operation is made up of venturi mixer 7, separator 8 and hot spent acid pump 9;
Described sulphur melts operation and is made up of sulfur melting kettle 10 and melt pump 11.
The dense spent acid of one of application the application produces sulfuric acid purification unstripped gas system, comprises the following steps:
A, sulphur melt
In sulfur melting kettle 10, melt sulphur E with the spent acid of heat, in sulfur melting kettle 10, liquidus temperature controls at 90 ~ ll0 DEG C, is transported to redox reaction operation after molten sulphur with melt pump 11;
B, redox reaction
The reaction compound that melt pump 11 transports enters the throat of Venturi reaction mixer 4, and containing SO
3flue gas mixing, reaction compound absorb SO
3gas, sulfuric acid concentration is improved, the heat of simultaneously stability flue gas, and temperature is raised, and under the vitriol oil atmosphere of heat, anti-raw redox reaction, produces and obtain SO
2; In Reaction Separation device 5, further redox reaction occurs and realize gas-liquid separation, reaction gas phase send energy recovery operation, and after reaction, the solid Countermeasure of Concentrated Acid Pump 6 of liquid-solid mixture height send temperature control gasification process;
The gasification of c, temperature control is decomposed
With coal-fired or combustion gas B for the energy, pass into combustion air A, burn in combustion unit l, high-temperature flue gas enters vaporizer 3 by flue 2, gas approach temperature 600 ~ 900 DEG C in vaporizer 3, and temperature out is adjusted to 300 ~ 500 DEG C; The high solid waste acid that high solid Countermeasure of Concentrated Acid Pump is sent here is sprayed and is contacted with combustion product gases in vaporizer 3, the anti-raw gasification separation of spent acid of high solids content, and gasification gas phase send redox operation, and solid phase is that acid sludge F is from vaporizer 3 bottom discharge;
D, energy recovery and purification
A small amount of acid gas is contained in the raw gas of sulfuric acid that redox reaction operation produces and flue gas gas mixture, mix with the dense spent acid D of input in venturi mixer 7, mixture temperature reduces, in gas mixture, a small amount of acid gas is absorbed, meanwhile, the dense waste acidity recovery heat energy of gas mixture, temperature improves, material realizes gas-liquid separation in separator 8, and the raw gas of sulfuric acid C of purification send subsequent process; Liquid phase is transported to sulphur with hot spent acid pump 9 and melts operation.
Implementation result: the Waste Sulfuric Acid rate of recovery >=99%.
The invention has the beneficial effects as follows: (1), by adding sulphur, redox reaction occurs, and the spent acid amount entering vaporizer declines to a great extent, and effectively reduces Carbureted heat energy consumption; Significantly improve the output of raw gas of sulfuric acid; (2) temperature control gasification is lower than high-temperature gasification gasification temperature, and energy consumption is low; (3) energy recovery is abundant; (4) useless solid with the discharge of dry solid slag form, decrease pollution.
Claims (3)
1. a dense spent acid produces sulfuric acid purification unstripped gas system, be take sulphur as reductive agent, dense spent acid is that oxygenant carries out Some redox reaction production sulfuric acid purification unstripped gas, spent acid the supplying gas decomposition further of unreacted high solids content, element sulphur in waste acid recovery, is separated solid phase slag in spent acid; Comprise temperature control gasification decomposition process, redox reaction operation, energy recovery operation and sulphur melt operation.
2. dense spent acid according to claim 1 produces sulfuric acid purification unstripped gas system, it is characterized in that:
Described temperature control gasification decomposition process is made up of combustion unit, flue, vaporizer;
Described redox reaction operation is made up of Venturi reaction mixer, Reaction Separation device and high solid waste acid pump;
Described energy recovery operation is made up of venturi mixer, separator and hot spent acid pump;
Described sulphur melts operation and is made up of sulfur melting kettle and melt pump.
3. dense spent acid according to claim 1 produces sulfuric acid purification unstripped gas system, it is characterized in that: comprise the following steps:
A, sulphur melt
In sulfur melting kettle, melt sulphur with the spent acid of heat, in sulfur melting kettle, liquidus temperature controls at 110 ~ 150 DEG C, uses melt pump delivery to redox reaction operation after molten sulphur;
B, redox reaction
The reaction compound that melt pump delivery is come enters the throat of Venturi reaction mixer, and containing SO
3flue gas mixing, reaction compound absorb SO
3gas, sulfuric acid concentration is improved, the heat of simultaneously stability flue gas, and temperature is raised, and under the vitriol oil atmosphere of heat, redox reaction occurs, produces and obtain SO
2; In Reaction Separation device, further redox reaction occurs and realize gas-liquid separation, reaction gas phase send energy recovery operation, the high solid concentrated acid pumping temperature control gasification process of liquid-solid mixture after reaction;
The gasification of c, temperature control is decomposed
With coal-fired or combustion gas for the energy, burn in combustion unit, high-temperature flue gas enters vaporizer by flue, gas approach temperature 600 ~ 900 DEG C in vaporizer, and temperature out is adjusted to 300 ~ 500 DEG C; High solid waste acid spraying and smoke contacts in vaporizer that high solid Countermeasure of Concentrated Acid Pump is sent here, the spent acid generating gasification of high solids content is separated, and gasification gas phase send redox operation, and solid phase is that acid sludge is from vaporizer bottom discharge;
D, energy recovery and purification
A small amount of acid gas is contained in the raw gas of sulfuric acid that redox reaction operation produces and flue gas gas mixture, mix with the dense spent acid of input in venturi mixer, mixture temperature reduces, in gas mixture, a small amount of acid gas is absorbed, meanwhile, the dense waste acidity recovery heat energy of gas mixture, temperature improves, material realizes gas-liquid separation in the separator, and the raw gas of sulfuric acid of purification send subsequent process; The hot spent acid pump delivery of liquid phase melts operation to sulphur.
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| CN109052335B (en) * | 2018-07-24 | 2023-08-22 | 上海三夫工程技术有限公司 | Method for preparing liquid sulfur dioxide and sulfuric acid by reducing waste sulfuric acid with sulfur gas |
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| DE2816469B1 (en) * | 1978-04-15 | 1979-08-02 | Davy Interma A Ouul Ag | Process for the thermal cracking of waste sulfuric acid |
| US4177248A (en) * | 1974-01-30 | 1979-12-04 | Stauffer Chemical Company | Production of sulfur dioxide from waste sulfuric acid |
| EP0091679A1 (en) * | 1982-04-14 | 1983-10-19 | Allied Corporation | Thermal decomposition of waste sulfuric acid |
| CN101723334A (en) * | 2008-10-31 | 2010-06-09 | 中冶焦耐工程技术有限公司 | Raw material pretreatment process for preparing sulfuric acid by using low-quality sulfur and sulphur-bearing waste solution |
| CN102745653A (en) * | 2011-04-22 | 2012-10-24 | 安徽理工大学 | Technology for producing sulphuric acid purification feed gas by high concentration waste acid |
| CN102826518A (en) * | 2011-06-15 | 2012-12-19 | 安徽理工大学 | Concentrated waste acid recovery technology |
| CN103030117A (en) * | 2012-12-28 | 2013-04-10 | 淮南市明月环保科技有限责任公司 | Recovering technology for waste acid |
| CN103193206A (en) * | 2013-02-28 | 2013-07-10 | 四川大学 | Method for producing SO2 through sulfur reduction and decomposition of sulfate |
| CN203922727U (en) * | 2014-06-09 | 2014-11-05 | 淮南市明月环保科技有限责任公司 | A kind of dense spent acid is produced sulfuric acid purification unstripped gas system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK98191A (en) * | 1991-05-24 | 1992-11-25 | Haldor Topsoe As | PROCEDURE FOR THE REGENERATION OF PURIFIC SULFURIC ACID |
| CN203722727U (en) * | 2014-01-21 | 2014-07-16 | 同方光电（沈阳）有限公司 | Side incident light-type liquid crystal TV |
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2014
- 2014-06-09 CN CN201410267398.5A patent/CN104016311B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4177248A (en) * | 1974-01-30 | 1979-12-04 | Stauffer Chemical Company | Production of sulfur dioxide from waste sulfuric acid |
| DE2816469B1 (en) * | 1978-04-15 | 1979-08-02 | Davy Interma A Ouul Ag | Process for the thermal cracking of waste sulfuric acid |
| EP0091679A1 (en) * | 1982-04-14 | 1983-10-19 | Allied Corporation | Thermal decomposition of waste sulfuric acid |
| CN101723334A (en) * | 2008-10-31 | 2010-06-09 | 中冶焦耐工程技术有限公司 | Raw material pretreatment process for preparing sulfuric acid by using low-quality sulfur and sulphur-bearing waste solution |
| CN102745653A (en) * | 2011-04-22 | 2012-10-24 | 安徽理工大学 | Technology for producing sulphuric acid purification feed gas by high concentration waste acid |
| CN102826518A (en) * | 2011-06-15 | 2012-12-19 | 安徽理工大学 | Concentrated waste acid recovery technology |
| CN103030117A (en) * | 2012-12-28 | 2013-04-10 | 淮南市明月环保科技有限责任公司 | Recovering technology for waste acid |
| CN103193206A (en) * | 2013-02-28 | 2013-07-10 | 四川大学 | Method for producing SO2 through sulfur reduction and decomposition of sulfate |
| CN203922727U (en) * | 2014-06-09 | 2014-11-05 | 淮南市明月环保科技有限责任公司 | A kind of dense spent acid is produced sulfuric acid purification unstripped gas system |
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