CN101492177B - Method for reduction and decomposition of phosphogypsum with yellow phosphorus tail gas - Google Patents
Method for reduction and decomposition of phosphogypsum with yellow phosphorus tail gas Download PDFInfo
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- CN101492177B CN101492177B CN2009100941663A CN200910094166A CN101492177B CN 101492177 B CN101492177 B CN 101492177B CN 2009100941663 A CN2009100941663 A CN 2009100941663A CN 200910094166 A CN200910094166 A CN 200910094166A CN 101492177 B CN101492177 B CN 101492177B
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- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 18
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical group O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims description 49
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 title claims description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000012265 solid product Substances 0.000 claims abstract description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000035484 reaction time Effects 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 74
- 239000000292 calcium oxide Substances 0.000 claims description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 10
- 239000005864 Sulphur Substances 0.000 claims description 10
- 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 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052731 fluorine Inorganic materials 0.000 claims description 8
- 239000011737 fluorine Substances 0.000 claims description 8
- 238000007605 air drying Methods 0.000 claims description 7
- 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
- 238000010521 absorption 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
- 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
- 239000000377 silicon dioxide Substances 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
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 229910052785 arsenic Inorganic materials 0.000 claims description 3
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims description 3
- 229960001866 silicon dioxide Drugs 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 239000002912 waste gas Substances 0.000 claims 1
- 230000002829 reductive effect Effects 0.000 abstract description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract 2
- 239000002253 acid Substances 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000003245 coal Substances 0.000 description 8
- 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 6
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- -1 CO 22~4% Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000002686 phosphate fertilizer Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000276489 Merlangius merlangus Species 0.000 description 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 1
- 101710194948 Protein phosphatase PhpP Proteins 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
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000019621 digestibility Nutrition 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- CXHHBNMLPJOKQD-UHFFFAOYSA-M methyl carbonate Chemical compound COC([O-])=O CXHHBNMLPJOKQD-UHFFFAOYSA-M 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 description 1
Abstract
The invention relates to a method for reducing and decomposing ardealite by tail gas of phosphor. The method comprises that: the naturally dried ardealite is put into a reductive decomposition furnace and filled with the tail gas of phosphor for reaction, and the furnace temperature is controlled to be between 700 and 1,000 DEG C, and the reaction time is between 10 and 50 minutes. The obtained furnace gas in which the content of the sulfur dioxide in percentage by volume is more than or equal to 15 percent is used as a material gas for the double-rotation double-suction acid preparation process; and the content of CaO, namely a solid product is more than or equal to 70 weight percent and is used as a cement material.
Description
One, technical field
The present invention relates to a kind of two kind by product phosphogypsum and the yellow phosphoric tail gas method of coming production high density sulfurous gas and qualified cement raw material of phosphorous chemical industry in producing of utilizing, belong to the phosphorous chemical industry 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, will 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 surpasses 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 produces 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 with phosphogypsum qualitative be Hazardous wastes, ardealite innocent is handled and comprehensive utilization becomes solid waste disposal and disposes research focus with the resource utilization field.
China's yellow phosphorus annual production has broken through 1,000,000 tons, yellow phosphorus by-product tail gas 2800～3000Nm per ton
3, the output of yellow phosphoric tail gas is very big, contains CO85～92% in the yellow phosphoric tail gas, CO
22～4%, phosphorus 500～800mg/Nm
3, arsenic 1～2mg/Nm
3, fluorine 400～500mg/Nm
3, sulphur 300～3000mg/Nm
3Yet, having only minority phosphorus production producer to utilize part tail gas to be used for raw material stoving or make the fuel gas of dry tripoly phosphate sodium STPP, indivedual producers utilize yellow phosphoric tail gas to produce phosgene and sodium formiate, methyl-formiate, formic acid, methylcarbonate etc.Most of producers all are not used, and in a mode of sky lamp, enter atmosphere with chimney stack (being generally the 30m height) burning, both severe contamination atmospheric environment, cause the significant wastage of carbon monoxide resource again, influenced the recycling of yellow phosphoric tail gas.
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 the qualified cement raw material of producing label more than No. 425.
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
1, Fa Ming purpose: for the technical support of developing a circular economy, develop the method for a kind of reduction and decomposition of phosphogypsum with yellow phosphorus tail gas production high density sulfurous gas and qualified cement raw material, solve the problem of environmental pollution that yellow phosphoric tail gas and phosphogypsum bring simultaneously, for the reasonable utilization of yellow phosphoric tail gas and phosphogypsum provides a new approach, exploitation potential carbon-sulphur resource, form a phosphorous chemical industry recycling economy industrial chain, realize yellow phosphoric tail gas and comprehensive utilization of phosphogypsum.Utilize reducing and decomposing phosphogypsum by carbon monoxide production high density sulfurous gas and qualified cement raw material in the yellow phosphoric tail gas, phosphogypsum rate of decomposition 〉=95wt%, desulfurization degree 〉=90wt%.
2, Fa Ming technical scheme is finished according to the following steps:
(1) material composition: the phosphogypsum main chemical compositions of natural air drying is by weight percentage: calcium oxide 26～37%, sulfurous gas 39～5 1%, ferric oxide 0.08～3.3 1%, aluminium sesquioxide 0.08～2.65%, Vanadium Pentoxide in FLAKES 0.47～1.28%, fluorine 0.05～0.26%, silicon-dioxide 8.20～15.38%, moisture 6～15%; The yellow phosphoric tail gas main chemical compositions is: the CO volume percent is 85～92%, CO
2Volume percent is 2～4%, phosphorus 500～800mg/Nm
3, arsenic 1～2mg/Nm
3, fluorine 400～500mg/Nm
3, sulphur 300～3000mg/Nm
3
(2) reduction decomposition: the phosphogypsum of natural air drying is put into the reduction decomposition stove, feed yellow phosphoric tail gas, gas speed is 5～20mL/min, control furnace temperature temperature is 700～1000 ℃, reaction times is 10～50 minutes, in the phosphogypsum in calcium sulfate and the yellow phosphoric tail gas CO react, reaction formula is: CaSO
4+ CO → CaO+2SO
2+ CO
2, carry out the concentration of sulfurous gas in the online detection furnace gas in the reaction process with flue gas analyzing apparatus, sulfurous gas volumn concentration 〉=15%, the sign reaction is finished, and stops to heat the reduction decomposition stove.The furnace gas of the volumn concentration of output sulfurous gas 〉=15% is directly made the acceptable material gas of double conversion double absorption acid-making process; CaO weight percentage 〉=70% in the solid product, directly as qualified cement raw material, the rate of decomposition 〉=95wt% of phosphogypsum, desulfurization degree 〉=90wt%.
3, Fa Ming positively effect:
(1) utilize this technology decomposing phosphogypsum, rate of decomposition 〉=95wt%, desulfurization degree 〉=90wt%, yellow phosphoric tail gas and phosphogypsum need not carry out pre-treatment; (2) concentration of sulfurous gas is high and stable in the furnace gas, can directly be used as the process for preparing sulfuric acid unstripped gas; (3) technology is simple, and decomposition temperature reduces greatly; (4) for yellow phosphoric tail gas has found the new approach that utilizes, reduce the discharging of yellow phosphoric tail gas, reduced environmental pollution; (5) the technological process digestibility and utilization each component of phosphogypsum, solved the innoxious and problem of outlet of " Hazardous wastes " phosphogypsum; Realized whole utilizations of product, unharmful substance enters environment; (6) make carbon resource in the yellow phosphoric tail gas and the sulphur resource in the phosphogypsum obtain reasonable utilization, formed a recycling economy industrial chain of phosphorous chemical industry industry, realized yellow phosphoric tail gas and comprehensive utilization of phosphogypsum, help the Sustainable development of phosphorous chemical industry.
Four, embodiment
Embodiment 1: the phosphogypsum main chemical compositions of natural air drying is by weight percentage: calcium oxide 35.24%, sulfurous gas 46.12%, ferric oxide 0.082%, aluminium sesquioxide 0.1 33%, Vanadium Pentoxide in FLAKES 1.14%, fluorine 0.09%, silicon-dioxide 9.45%, moisture 7.56%.Phosphogypsum 10.0g is put into the reduction decomposition stove, it is 85～90% yellow phosphoric tail gas that feeding contains the CO volume percent, gas speed is 6mL/min, the control furnace temperature is 812 ± 20 ℃, carries out reduction decomposition reaction 21 minutes, detects the concentration of sulfurous gas in the furnace gas with the flue gas analyzing apparatus on-line continuous, sulfurous gas volumn concentration 〉=15%, the sign reaction is finished, and stops to heat the reduction decomposition stove, and sulfurous gas is directly made the acceptable material gas of double conversion double absorption acid-making process.Behind the naturally cooling, take out solid product and analyze, calcium oxide content is 71.9wt% in the solid product, directly makes qualified cement raw material.The phosphogypsum rate of decomposition is 95.3wt% as calculated, and desulfurization degree is 92.5wt%,
Embodiment 2: the phosphogypsum main chemical compositions of natural air drying is by weight percentage: 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 2.56%, moisture 12.64%.Phosphogypsum 15.0g is sent into the reduction decomposition stove, it is 85～90% yellow phosphoric tail gas that feeding contains the CO volume percent, gas speed is 6mL/min, the control furnace temperature is 845 ± 20 ℃, carries out reduction decomposition reaction 34 minutes, detects the concentration of sulfurous gas in the furnace gas with the flue gas analyzing apparatus on-line continuous, sulfurous gas volumn concentration 〉=15%, the sign reaction is finished, and stops to heat the reduction decomposition stove, and sulfurous gas is directly made the acceptable material gas of double conversion double absorption acid-making process.Behind the naturally cooling, take out solid product and analyze, calcium oxide content is 70.3wt% in the solid product, directly makes qualified cement raw material.The phosphogypsum rate of decomposition is 96.4wt% as calculated, and desulfurization degree is 93.2wt%.
Embodiment 3: the phosphogypsum main chemical compositions of natural air drying is by weight percentage: 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 2.1%, moisture 9.5%.Above-mentioned phosphogypsum 20.0g is put into the reduction decomposition stove, it is 85～90% yellow phosphoric tail gas that feeding contains the CO volume percent, gas speed is 6mL/min, the control furnace temperature is 884 ± 20 ℃, carries out reduction decomposition reaction 46 minutes, detects the concentration of sulfurous gas in the furnace gas with the flue gas analyzing apparatus on-line continuous, sulfurous gas volumn concentration 〉=15%, the sign reaction is finished, and stops to heat the reduction decomposition stove, and sulfurous gas is directly made the acceptable material gas of double conversion double absorption acid-making process.Behind the naturally cooling, take out solid product and analyze, calcium oxide content is 71.3wt% in the solid product, directly makes qualified cement raw material.The phosphogypsum rate of decomposition is 95.7wt% as calculated, and desulfurization degree is 95.4wt%.
Claims (1)
1. the method for a reduction and decomposition of phosphogypsum with yellow phosphorus tail gas is used waste gas yellow phosphoric tail gas reduction decomposition residue phosphogypsum, it is characterized in that:
1.1 material composition: the phosphogypsum main chemical compositions of natural air drying is by weight percentage: 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%, fluorine 0.05～0.26%, silicon-dioxide 8.20～15.38%, moisture 6～15%; The yellow phosphoric tail gas main chemical compositions is: the CO volume percent is 85～92%, CO
2Volume percent is 2～4%, phosphorus 500～800mg/Nm
3, arsenic 1～2mg/Nm
3, fluorine 400～500mg/Nm
3, sulphur 300～3000mg/Nm
3
1.2 reduction decomposition: the phosphogypsum of natural air drying is put into the reduction decomposition stove, feed yellow phosphoric tail gas, gas speed is 5～20mL/min, control furnace temperature temperature is 700～1000 ℃, reaction times is 10～50 minutes, in the phosphogypsum in calcium sulfate and the yellow phosphoric tail gas CO react, reaction formula is: CaSO
4+ CO → CaO+SO
2+ CO
2Carry out the concentration of sulfurous gas in the online detection furnace gas in the reaction process with flue gas analyzing apparatus, sulfurous gas volumn concentration 〉=15%, the sign reaction is finished, and stops to heat the reduction decomposition stove, the furnace gas of the volumn concentration of output sulfurous gas 〉=15%, directly make the acceptable material gas of double conversion double absorption acid-making process, CaO weight percentage 〉=70% in the solid product is directly as qualified cement raw material, rate of decomposition 〉=the 95wt% of phosphogypsum, desulfurization degree 〉=90wt%.
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| CN2009100941663A CN101492177B (en) | 2009-03-09 | 2009-03-09 | Method for reduction and decomposition of phosphogypsum with yellow phosphorus tail gas |
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|---|---|---|---|
| CN2009100941663A CN101492177B (en) | 2009-03-09 | 2009-03-09 | Method for reduction and decomposition of phosphogypsum with yellow phosphorus tail gas |
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| CN101492177B true CN101492177B (en) | 2010-11-10 |
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| CN103864023B (en) * | 2014-03-11 | 2016-08-24 | 昆明理工大学 | A kind of method of ardealite carbonating tail gas reducing and decomposing phosphogypsum |
| CN106006643B (en) * | 2016-06-28 | 2018-07-24 | 昆明理工大学 | A method of preparing calcium carbide using yellow phosphoric tail gas and ardealite |
| CN108516713B (en) * | 2018-03-16 | 2020-02-14 | 中南大学 | Pretreatment and application method of phosphogypsum |
| CN110240135B (en) * | 2019-07-12 | 2021-07-27 | 昆明理工大学 | Method and system for pre-dearsenifying of high-arsenic phosphorite |
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