CN101492176B - Method for decomposing phosphogypsum with enclosed calcium carbide burner gas reduction - Google Patents
Method for decomposing phosphogypsum with enclosed calcium carbide burner gas reduction Download PDFInfo
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- CN101492176B CN101492176B CN2009100941659A CN200910094165A CN101492176B CN 101492176 B CN101492176 B CN 101492176B CN 2009100941659 A CN2009100941659 A CN 2009100941659A CN 200910094165 A CN200910094165 A CN 200910094165A CN 101492176 B CN101492176 B CN 101492176B
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- gas
- phosphogypsum
- calcium carbide
- ardealite
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- 239000005997 Calcium carbide Substances 0.000 title claims abstract description 39
- 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 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 18
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims description 49
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 32
- 239000000292 calcium oxide Substances 0.000 claims abstract description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000004568 cement Substances 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 6
- 230000035484 reaction time Effects 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 64
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000012265 solid product Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 5
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 229960001866 silicon dioxide Drugs 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims description 2
- 230000002829 reductive effect Effects 0.000 abstract description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract 4
- 239000002253 acid Substances 0.000 abstract 1
- 239000003638 chemical reducing agent Substances 0.000 abstract 1
- YQCIWBXEVYWRCW-UHFFFAOYSA-N methane;sulfane Chemical compound C.S YQCIWBXEVYWRCW-UHFFFAOYSA-N 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 239000005864 Sulphur Substances 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 2
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 2
- 239000002686 phosphate fertilizer Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 241000276489 Merlangius merlangus Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- GJEAMHAFPYZYDE-UHFFFAOYSA-N [C].[S] Chemical compound [C].[S] GJEAMHAFPYZYDE-UHFFFAOYSA-N 0.000 description 1
- QLULGSLAHXLKSR-UHFFFAOYSA-N azane;phosphane Chemical compound N.P QLULGSLAHXLKSR-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention relates to a method for reducing and decomposing ardealite by furnace gas of a closed calcium carbide furnace. The technical problems needed to be solved comprise that: carbon monoxide in the furnace gas of the closed calcium carbide furnace is used as a reducer to reduce and decompose the ardealite, the decomposition temperature of the ardealite is controlled to be between 750 and 850 DEG C, the reaction time is between 10 and 50 minutes, sulfur dioxide with high concentration and qualified cement materials are obtained, the decomposition rate of the ardealite is more than or equal to 95 percent, and the desulphurization rate is more than or equal to 90 percent. The decomposition temperature of the ardealite is greatly reduced, thereby achieving the aims of saving energy and reducing consumption. The method develops potential carbon-sulfur resources, and realizes the comprehensive utilization of the ardealite and the furnace gas of the closed calcium carbide furnace; and simultaneously, the obtained calcium oxide can be used as a raw material to produce high quality cement, and the sulfur dioxide can be used as a material gas to produce acid.
Description
One, technical field
The present invention relates to a kind of by product phosphogypsum (solid useless) and enclosed calcium carbide burner gas (waste gas) in the calcium carbide production method of coming production high density sulfurous gas and qualified cement raw material of phosphorous chemical industry in producing of utilizing, belong to phosphorous chemical industry and calcium carbide furnace gas and fully utilize the field.
Two, background technology
Phosphogypsum is that Rock Phosphate (72Min BPL) and sulfuric acid react and the industrial residue that produces in the Wet-process Phosphoric Acid Production process, to produce 4～5 tons of phosphogypsums by the phosphoric acid that calculates 1 ton of every production, at present the quantity discharged in whole world phosphogypsum every year reaches more than 200,000,000 ton, but the utilization ratio of phosphogypsum does not surpass 10%, and the processing of phosphogypsum, disposal and comprehensive utilization have become a global difficult problem.China's phosphate fertilizer production ranks first in the world, and the phosphate fertilizer of production high density (as phosphorus ammonium, coarse whiting etc.) needs a large amount of phosphoric acid by wet processes, also can produce a large amount of phosphogypsum slags thereupon.The stacking of phosphogypsum not only takies a large amount of soils, expends a huge sum of money, and solubility P
2O
5With objectionable constituent such as fluorochemical by water body environment scattering and permeating towards periphery, form secondary pollution.In May, 2006, State Environmental Protection Administration in " ring letter (2006) No. 176 literary compositions " with phosphogypsum qualitative be Hazardous wastes.Therefore the research focus that becomes solid waste disposal disposal and resource utilization field is handled and fully utilized to ardealite innocent.
In calcium carbide was produced, 1 ton of calcium carbide of the every production of closed calcium carbide furnace produced furnace gas 400Nm
3, a capacity is 25500KVA enclosed calcium carbide burner gas amount 2400～2800Nm
3, carbon monoxide and hydrogen richness are a kind ofly rare to have very that usury can be used as material gas with the gas that is worth up to nearly 90% in the calcium carbide burner gas, the product that synthetic added value is higher is created bigger benefit.In the past,, simultaneously, its purification techniques was not had perfect research, had some difficult problems yet, influenced the utilization of calcium carbide furnace gas because furnace gas contains the existence of sulphur, phosphorus, cyanogen, tar and a large amount of impurity such as flue dust.At present, owing to there is not the ideal calcium carbide furnace gas to purify recovery technology, a lot of producers can only burn furnace gas emptying, enter atmosphere after (the being generally the 30m chimney stack) burning that applies a torch, both severe contamination atmospheric environment, cause the significant wastage of carbon monoxide resource again.
For the technical support of developing a circular economy, the present invention develops a kind of method of decomposing phosphogypsum with enclosed calcium carbide burner gas reduction, with the method for decomposing phosphogypsum with enclosed calcium carbide burner gas reduction production high density sulfurous gas and qualified cement raw material, can solve the problem of environmental pollution that enclosed calcium carbide burner gas and phosphogypsum bring simultaneously.Whole process flow provides a new approach for the reasonable utilization of enclosed calcium carbide burner gas and phosphogypsum, developed potential carbon-sulphur resource, realize enclosed calcium carbide burner gas and comprehensive utilization of phosphogypsum, eliminated the environmental pollution that enclosed calcium carbide burner gas and phosphogypsum cause simultaneously.
Up to now, do not see report as yet with the patent of invention of decomposing phosphogypsum with enclosed calcium carbide burner gas reduction, research document etc.
A kind of method of utilizing the high sulphur coal reducing and decomposing phosphogypsum is disclosed in patent of invention CN1884048A.Earlier with the high sulphur coal of phosphogypsum and sulphur content 〉=3% respectively 100～110 ℃ down oven dry 1.5～2.0 hours to water content less than 8wt%, phosphogypsum that drying is crossed and high sulphur coal are sent into the decomposing furnace of redeeming a vow to a god after mixing with mass ratio 20: 1～2 then, 800～1350 ℃ of control furnace temperature, react 1.5～2.0 hours, but output SO
2The furnace gas of volumn concentration 〉=15%, can directly make the acceptable material gas of double conversion double absorption technology, CaO content 〉=70% in the solid product can be directly as producing qualified cement raw material.
In patent of invention CN1935727A, disclose a kind of coal gangue and phosphogypsum of utilizing and produce sulfuric acid raw material-high density SO next life
2The method of flue gas and high strength cement raw material.Earlier with the high sulphur coal of phosphogypsum and sulphur content 〉=3% respectively 100 ℃～110 ℃ down oven dry 1.5～2.0 hours to water content less than 8wt%, and then phosphogypsum and coal gangue that drying is crossed sent into ball mill respectively, being milled to particle diameter≤76 μ m accounts for more than 90%, obtain phosphogypsum powder and coal gangue powder, then with phosphogypsum powder and coal gangue powder with 1～10: 1 mass ratio batching also is mixed into compound, at last compound was reacted 0.5～2.0 hour SO at 850～1350 ℃ of decomposing furnace internal heating
2Flue gas is used for acid-making process, and decompose slag is as cement raw material.
Three, summary of the invention
The method that the purpose of this invention is to provide a kind of enclosed calcium carbide burner gas and phosphogypsum reducing and decomposing phosphogypsum, the technical issues that need to address are to utilize that carbon monoxide is the reductive agent reducing and decomposing phosphogypsum in the enclosed calcium carbide burner gas, 750～850 ℃ of control ardealite decomposition temperatures, output high density sulfurous gas and qualified cement raw material, phosphogypsum rate of decomposition 〉=95%, desulfurization degree 〉=90%.Ardealite decomposition temperature is significantly reduced, reach energy saving purposes.
The present invention finishes according to the following steps
Above-mentioned phosphogypsum is sent into the reduction decomposition stove, feed enclosed calcium carbide burner gas, and the control furnace temperature is 700～900 ℃, reaction times is 10～50 minutes, in the phosphogypsum in calcium sulfate and the enclosed calcium carbide burner gas CO react, carry out SO in the online detection furnace gas with comprehensive smoke components with flue gas analyzing apparatus in the reaction process
2Concentration, when sulfurous gas volumn concentration 〉=15%, react completely, stop to heat the reduction decomposition stove, output SO
2The furnace gas of volumn concentration 〉=15%, can directly make the acceptable material gas of double conversion double absorption acid-making process, CaO quality percentage composition 〉=70% in the solid product can be directly as producing qualified cement raw material, the rate of decomposition of phosphogypsum 〉=95%, desulfurization degree 〉=90%.The principal reaction equation that takes place in the reduction decomposition process is:
CaSO
4+CO→CaO+2SO
2+CO
2
S+O
2→SO
2
Described raw material phosphogypsum main chemical compositions mass percent can be calcium oxide 26～37%, sulfurous gas 39～51%, ferric oxide 0.08～3.31%, aluminium sesquioxide 0.08～2.65%, Vanadium Pentoxide in FLAKES 0.47～1.28%, silicon-dioxide 8.20～15.38%, total amount 100%.
Described enclosed calcium carbide burner gas main chemical compositions volume percent can be CO70～85%, CO
21～4%, H
23-7%, O
22-4%, N
27-9%, total amount 100%.
Major advantage of the present invention has:
(1), output high density sulfurous gas and qualified cement raw material, phosphogypsum rate of decomposition 〉=95%, desulfurization degree 〉=90%.Ardealite decomposition temperature is significantly reduced, reach energy saving purposes;
(2) reduced the discharging of enclosed calcium carbide burner gas, reduced environmental pollution, for enclosed calcium carbide burner gas has found the new approach that utilizes;
(3) make the carbon resource in the enclosed calcium carbide burner gas obtain reasonable utilization, formed a recycling economy industrial chain of chemical industry.
Four, embodiment
Embodiment 1: phosphogypsum main chemical compositions mass percent is a calcium oxide 35.24%, sulfurous gas 46.12%, ferric oxide 0.082%, aluminium sesquioxide 0.133%, Vanadium Pentoxide in FLAKES 1.14%, total amount 100%; Above-mentioned phosphogypsum 10g is sent into the reduction decomposition stove, feeding contains the enclosed calcium carbide burner gas that volume percent is 70～85%CO, its flow velocity is the 6-10 milliliters/second, the control furnace temperature is 750～800 ℃, carry out reduction decomposition reaction 45 minutes, work as sulfurous gas volumn concentration 〉=15% with sulfurous gas volume content in the flue gas analyzing apparatus on-line continuous detection furnace gas, react completely, stop to heat the reduction decomposition stove, react completely, stop to heat the reduction decomposition stove, behind the naturally cooling, take out solid product and carry out analytical calculation, the phosphogypsum rate of decomposition is 97%, desulfurization degree is 95%, and calcium oxide content is 71.9% in the solid product of generation.
Embodiment 2: phosphogypsum main chemical compositions mass percent is: calcium oxide 29.89% sulfurous gas 41.25%, ferric oxide 0.197%, aluminium sesquioxide 0.312%, Vanadium Pentoxide in FLAKES 0.89%, fluorine 0.18%, silica 1 0.56%; Above-mentioned phosphogypsum 15g is sent into the reduction decomposition stove, and feeding contains the enclosed calcium carbide burner gas that volume percent is 70～85%CO, and its flow velocity is the 6-10 milliliters/second, enclosed calcium carbide burner gas, and the control furnace temperature is 800～850 ℃.Carry out reduction decomposition reaction 38 minutes, work as sulfurous gas volumn concentration 〉=15% with sulfurous gas volume content in the flue gas analyzing apparatus on-line continuous detection furnace gas, react completely, stop to heat the reduction decomposition stove, react completely, stop to heat the reduction decomposition stove, behind the naturally cooling, take out solid product and carry out analytical calculation, the phosphogypsum rate of decomposition is 95%, desulfurization degree is 96%, and calcium oxide content is 70.3% in the solid product of generation.
Embodiment 3: phosphogypsum main chemical compositions mass percent is: calcium oxide 33.56% sulfurous gas 43.18%, ferric oxide 0.129%, aluminium sesquioxide 0.21%, Vanadium Pentoxide in FLAKES 1.17%, fluorine 0.24%, silica 1 2.10%; Above-mentioned phosphogypsum 20g is sent into the reduction decomposition stove, and feeding contains the enclosed calcium carbide burner gas that volume percent is 70～85%CO, and its flow velocity is the 6-10 milliliters/second, and the control furnace temperature is 800～900 ℃.Carry out reduction decomposition reaction 30 minutes, work as sulfurous gas volumn concentration 〉=15% with sulfurous gas volume content in the flue gas analyzing apparatus on-line continuous detection furnace gas, react completely, stop to heat the reduction decomposition stove, react completely, stop to heat the reduction decomposition stove, behind the naturally cooling, take out solid product and carry out analytical calculation, the phosphogypsum rate of decomposition is 96%, desulfurization degree is 95%, and calcium oxide content is 71.3% in the solid product of generation.
Claims (2)
1. the method for a decomposing phosphogypsum with enclosed calcium carbide burner gas reduction, with the main chemical compositions mass percent is calcium oxide 26～37%, sulfurous gas 39～51%, ferric oxide 0.08～3.31%, aluminium sesquioxide 0.08～2.65%, Vanadium Pentoxide in FLAKES 0.47～1.28%, silicon-dioxide 8.20～15.38%, the phosphogypsum of total amount 100% carries out the reduction decomposition reaction as raw material
It is characterized in that: described reduction decomposition reaction is finished according to the following steps, above-mentioned phosphogypsum is sent into the reduction decomposition stove, feed enclosed calcium carbide burner gas, and the control furnace temperature is 700～900 ℃, reaction times is 10～50 minutes, in the phosphogypsum in calcium sulfate and the enclosed calcium carbide burner gas CO react, the comprehensive smoke components in the reaction process carries out SO in the online detection furnace gas with flue gas analyzing apparatus
2Concentration, when sulfurous gas volumn concentration 〉=15%, react completely, stop to heat the reduction decomposition stove, output SO
2The furnace gas of volumn concentration 〉=15%, directly as the acceptable material gas of double conversion double absorption acid-making process, CaO quality percentage composition 〉=70% in the solid product is directly as the qualified cement raw material of production, the rate of decomposition of phosphogypsum 〉=95%, desulfurization degree 〉=90%.
2. the method for decomposing phosphogypsum with enclosed calcium carbide burner gas reduction according to claim 1, it is characterized in that: described enclosed calcium carbide burner gas main chemical compositions volume percent is CO70～85%, CO
21～4%, H
23-7%, O
22-4%, N
27-9%, total amount 100%.
Priority Applications (1)
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|---|---|---|---|
| CN2009100941659A CN101492176B (en) | 2009-03-09 | 2009-03-09 | Method for decomposing phosphogypsum with enclosed calcium carbide burner gas reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100941659A CN101492176B (en) | 2009-03-09 | 2009-03-09 | Method for decomposing phosphogypsum with enclosed calcium carbide burner gas reduction |
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| CN101492176B true CN101492176B (en) | 2011-07-20 |
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| CN102936101B (en) * | 2012-11-12 | 2014-10-08 | 石家庄新华能源环保科技股份有限公司 | Method and device for producing lime and sulfuric acid by using gypsum |
| CN108516713B (en) * | 2018-03-16 | 2020-02-14 | 中南大学 | Pretreatment and application method of phosphogypsum |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3661518A (en) * | 1970-02-24 | 1972-05-09 | Elcor Chem Corp | Process for converting sulfates to sulfides |
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2009
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3661518A (en) * | 1970-02-24 | 1972-05-09 | Elcor Chem Corp | Process for converting sulfates to sulfides |
Non-Patent Citations (2)
| Title |
|---|
| 戴服管 等.我国工业废气的现状及对策.四川化工.1996,(2),40-44. * |
| 马林转.循环流化床分解磷石膏及分解气体资源化研究.中国博士学位论文全文数据库工程科技Ⅰ辑.2007,(5),34,59,61-63. * |
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