CN101314462A - Reclamation comprehensive utilization method for desulfurized gypsum - Google Patents
Reclamation comprehensive utilization method for desulfurized gypsum Download PDFInfo
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- CN101314462A CN101314462A CNA2008100586455A CN200810058645A CN101314462A CN 101314462 A CN101314462 A CN 101314462A CN A2008100586455 A CNA2008100586455 A CN A2008100586455A CN 200810058645 A CN200810058645 A CN 200810058645A CN 101314462 A CN101314462 A CN 101314462A
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- desulfurated plaster
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- desulfurization
- desulfurized gypsum
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 19
- 239000010440 gypsum Substances 0.000 title claims abstract description 19
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000005864 Sulphur Substances 0.000 claims abstract description 37
- 239000003245 coal Substances 0.000 claims abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003546 flue gas Substances 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 230000035484 reaction time Effects 0.000 claims abstract description 3
- 239000011505 plaster Substances 0.000 claims description 37
- 238000006477 desulfuration reaction Methods 0.000 claims description 36
- 230000023556 desulfurization Effects 0.000 claims description 35
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 17
- 239000004568 cement Substances 0.000 abstract description 14
- 239000002893 slag Substances 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract description 7
- 239000001117 sulphuric acid Substances 0.000 abstract description 4
- 235000011149 sulphuric acid Nutrition 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000012993 chemical processing Methods 0.000 abstract 1
- 239000003638 chemical reducing agent Substances 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000004566 building material Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- JNVCSEDACVAATK-UHFFFAOYSA-L [Ca+2].[S-]SSS[S-] Chemical compound [Ca+2].[S-]SSS[S-] JNVCSEDACVAATK-UHFFFAOYSA-L 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000011507 gypsum plaster Substances 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229940051851 sulfurated lime Drugs 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 206010011416 Croup infectious Diseases 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention relates to a resource comprehensive utilization method for desulfurized gypsum. The invention provides a method for jointly producing cement clinker by utilizing high-sulphur coal as a reducer to reduce and decompose the desulfurized gypsum produced by the desulphurization of coal-fired flue gas and reclaim sulphur resource, belonging the chemical processing technical field. The method comprises the following steps that: the high-sulphur coal and the dried desulfurized gypsum by mass ratio of 1 to 7-20 are added into a reducing and decomposing furnace for decomposition; a reaction temperature is controlled between 800 and 1400 DEG C; the reaction time is controlled between 0.5 and 2.5 hours; in the reaction process, a flue gas analyzer is used to carry out on-line detection to the compositions of flue gas; when the volume percentage of SO2 is controlled to be more than or equal to 16 percent, the reaction is finished. A decomposition rate of the desulfurized gypsum is more than or equal to 96 percent; a desulphurization rate is more than or equal to 90 percent; and no secondary pollution is produced in the process. Produced gas can be used as raw material gas for sulphuric acid production and is directly sent to the sulphuric acid production process, and solid slag is cooled and used as cement clinker for cement production.
Description
One, technical field
The present invention relates to a kind of method of desulfurated plaster comprehensive utilization of resources, is to utilize high sulphur coal to make the desulfurated plaster reduction decomposition of coal-fired flue gas desulfurization generation reclaim the method for sulphur resource jointly producing cement grog as reductive agent, belongs to a kind of chemical treatment method field.
Two, background technology
Along with environmental protection requirement is more and more stricter, SO in the flue gas
2Emission control is also more and more stricter.According to " State Council is about the reply of acid rain control district and sulfur dioxide pollution control region related problems " regulation, by 2010, the sulfur dioxide emissions overall control was in emission level in 2000.Therefore, flue gas desulfurization is the Air Pollution Control measure that coal-burning power plant, boiler must be taked.
Desulfurated plaster is the primary pollution source SO of thermal power plant
2Byproduct after the processing, fume desulphurization method mainly contain wet method, semidrying and dry desulfurization.Remove one ton of SO in theory
2Can produce 3-4 ton aqueous gypsum, remove a few countries such as Japan, Germany at present because gypsum resource lacks, desulfurated plaster further is oxidized to outside the deficiency of the additional gypsum resource of purer gypsum, all the other most of countries abandon processing with desulfurization slag.Domestic wet desulphurization is most typical to be Chongqing Lopa Nationality semi-annular jade pendant power plant, and its desulfuration byproduct gypsum purity is very high, but owing to reasons such as market also have only 10% to be utilized, major part is still stacked.Semidrying, dry desulfurization are used lime mostly, and its desulfurization slag mainly contains CaSO
3, CaSO
4, CaO, Ca (OH)
2, flying dust etc., be difficult to utilize because of its complicated component is unstable.Investigation shows, expects 2010, and the desulfurated plaster that China stores up and other gypsum by-products will be above 100,000,000 tons.A large amount of desuifurized accumulations need take a large amount of arable lands and spend a large amount of processing costss, also can cause to the harm of environment and to phreatic pollution.Therefore, the desuifurized processing become the important factor that the desulfurization of restriction calcium method is applied.
At present, research and the application to desulfurated plaster abroad obtained rich experience, in Finland, aspects such as ash mainly is used in and builds the road in LIFAC desulfurization (desulfurization of flue gas afterbody humidification activation), brickmaking, mixed earth blending are used, and are also in the ascendant in otherwise application such as plant growing soil adjustings.It is late that starting is implemented in domestic flue gas desulfurization, research to desulfurization ash drops into few, composition and physicochemical property to desulphurize fly ash are not very understood, on the problem of complex utilization of desulphurize fly ash, also there are misgivings, though doing some researchs aspect building materials, the soil pH value adjusting, but for by semidrying, dry desulfurization and the lime-ash that produces, because of its main component is CaSO
3, the meeting slow oxidation easily discharges SO in acidic medium in air
2,, when high-temperature roasting, discharge SO again if make building materials
2, form secondary pollution and more difficult utilization.Therefore the desulfurization ash of China power plant generation is mainly based on stacking, and the desulfurization ash treatment and disposal is imperative.Along with further carrying out of power plant desulfurization, the ratio of desulfurization ash is with increasing, and can desulfurization ash be disposed and utilized preferably, to the long-term stability operation and the environment protection decisive role of thermal power plant.In the research of utilization of desulfurization slag, except that being used to make the research of aspects such as building materials, soil improvement agent, it is a kind of very attractive method that desulfurization slag is decomposed recovery sulphur resource.Utilize calcium sulfate to decompose the recycling that the Mueller-Kuhne method of system sulfuric acid and cement and OSW-Krupp method can realize desulfurization slag on the principle, but owing to its cost investment is too high, impurity in the severe reaction conditions, desulfurated plaster has a significant impact cement quality and is difficult to practical application.U.S. F.S.Chalmers once proposed as reductive agent the desulfurization ash reduction to be obtained sulfurated lime with carbon, and then with the hydrogen sulfide solution extraction, the product that obtains further is processed into calcium cpd and hydrogen sulfide, further obtains elemental sulfur.This method is similar to traditional Kel-S method.So promptly from desulfurization ash, reclaimed the sulphur composition, can power plant made a profit calcium circulation utilization again.This technology key technology is only grasped by the he or she at present.
Present world sulphur resource provisioning anxiety, and China also is the country of a sulphur resource scarcity, the gas washing in SA production industry needs a large amount of imported sulphur, and the sulphur price increase has brought high cost for the acid production with sulphur industry, has limited the development of enterprise.
It is the country of main energy sources with coal that China is one, and coal reserves is at the forefront in the world.Wherein sulfur-bearing is respectively 4,260 hundred million tons and 62,000,000,000 tons greater than the prognostic reserves and the proven reserve of 3% high sulphur coal.Because coal burning produces the influence of a large amount of sulfurous gas to atmosphere quality, country is about " two control district's acid rains and sulfur dioxide pollution prevent and treat the Tenth Five-Year Plan (2001-2005) ", sulphur content is classified as greater than 3% high sulphur coal forbids exploitation and forbidding coal.
The present invention produces sulfurated lime with high sulphur coal as reductive agent from desulfurization slag, further generate SO
2As the gas washing in SA production unstripped gas, not only can make full use of sulphur resource in the coal, reclaim the sulphur resource in the desulfurated plaster.Simultaneously, the solid slag that obtains after the desulfurization can directly be used to produce cement as cement clinker.Realize the comprehensive utilization of desulfurated plaster, reduce plaster of paris exploitation, the protection environment.
A kind of method of being produced sulfuric acid and cement by desulfurized gesso of flue gas is disclosed among the patent documentation CN1958498A, be a kind ofly desulfurized gesso of flue gas is carried out drying to obtain semi-hydrated gypsum, the material that adds trioxygen-containingization two iron, aluminium sesquioxide and silicon-dioxide again, adding carbon mixes, obtain sulfurous gas and cement clinker 900-1450 ℃ of calcining, gained sulfurous gas prepares industrial sulphuric acid with the double conversion double absorption method.
A kind of limestone-gypsum wet desulphurization and desulfurated plaster recycling processing method and system are disclosed among the patent documentation CN1727296A, be in fume emission factory, the limestone-gypsum wet desulphurization is produced contain the desulfurated plaster of free-water below 10%, utilize waste heat that boiler and coal combustion equipment produce to carry out thermal dehydration as the thermal source of dehydration equipment, obtain to contain trip A dried up 4% below can be direct applied as the semi-hydrated gypsum or the dehydrated gyp-of purposes such as the dihydrate gypsum of cement setting retarder or conduct building.
A kind of production technology of full-dry desulfurizing gypsum building material product is disclosed among the patent documentation CN101172796A, be a kind of be raw material with desulfurated plaster, phosphogypsum and the plaster of paris, through calcining, sieving, add the inorganic silicon water-resisting agent, use the brick paving machine tile work again, the high pressure compacting, the method for acquisition high-density building material product.
Three, summary of the invention
The objective of the invention is to, provide a kind of with high sulphur coal reduction decomposition desulfurated plaster comprehensive utilization of resources method, produce SO in the furnace gas
2Volumn concentration 〉=16%, can be directly as the unstripped gas of double conversion double absorption gas washing in SA production, and reclaim the sulphur resource, solid slag contains CaO 〉=70%, can be directly as the production cement clinker.Whole process non-secondary pollution, desulfurated plaster rate of decomposition 〉=96%, desulfurization degree 〉=90%.
Technical scheme of the present invention is implemented according to the following steps:
1. raw material is (wt%) CaO 30-40% for the desulfurated plaster main component, SiO
21.0-2.5%, Al
2O
30.3-0.5%, SO
240.0-50.0%, Fe
2O
30.10-0.15%, MgO 0.15-0.25%, Na
20 0.8-0.9%, KaO0.10-0.15%, H
2O 17.0-20.0%; The high sulphur coal sulphur content is 2.3%-3.6%.
2. desulfurized gesso of flue gas and high sulphur coal are carried out drying at 110-130 ℃, slough whole free-waters and partial crystallization water, time 3-6 hour;
3. high sulphur coal and dried desulfurated plaster being added the reduction decomposition stove with the ratio of mass ratio 1: 7-20 decomposes, the decomposing furnace temperature rise rate is controlled at 10-25 ℃/min, control reaction temperature is 800-1400 ℃, the decomposition reaction time was controlled at 0.5-2.5 hour, smoke components carries out online detection with flue gas analyzing apparatus in the reaction process, with SO
2Volumn concentration 〉=16% is as reaction finishing control condition.
Output gas can be used as the gas washing in SA production unstripped gas and directly sends into straight sour workshop section, and manufacture of cement is carried out as cement clinker in solid slag cooling back.The principal reaction that the reduction decomposition stove is taken place is
CaSO
4+C→CaS+CO
2
Or CaSO
3+ C → CaS+CO
2↑
2CaSO
4+C→2CaO+2SO
2↑+CO
2↑
CaS+3CaSO
4→4CaO+4SO
2↑
CaS+.H
2S→Ca(HS)
2
Ca(HS)
2+CO
2+.H
2O→CaCO
3+.H
2S
CaS+H
2O+CO
2→CaCO
3+H
2S↑
2H
2S+3O
2→2H
2O+SO
2↑
Major advantage of the present invention has:
(1) technology desulfurated plaster rate of decomposition of the present invention 〉=96%, desulfurization degree 〉=90%, process non-secondary pollution;
What (2) produce contains SO
2Gas volume percentage composition 〉=16% can directly feed gas washing in SA production workshop section double conversion double absorption and prepare industrial sulphuric acid;
(3) this method work simplification, cost reduces greatly.This technology can be utilized power plant's existing resource, has not only disposed the desulfurization ash waste, has reclaimed the sulphur resource of flue gas desulfurization again, can be power plant and makes a profit;
(4) utilize high sulphur coal to make reductive agent, the high sulfur coal resource of forbidding is utilized effectively, develop potential sulphur resource, realize a large amount of solid waste desulfurated plaster comprehensive utilization of resources that coal fired thermal power plant flue gas desulfurization produces simultaneously, realize recycling economy, the Sustainable development of coal-burning power plant's industry.
(5) the present invention is applied widely, and not only the desulfurated plaster that produces applicable to the coal-burning power plant also is applicable to the desulfurated plaster that any kiln gas desulfurization produces.
Four, embodiment
Embodiment 1: desulfurated plaster main component and weight percent are: CaO 35.15%, SiO
21.12%, Al
2O
30.37%, SO
243.85%, Fe
2O
30.13%, MgO 0.26%, Na
2O 0.85%, and KaO 0.13%, and moisture content and all the other impurity account for 18.14%, adds up to 100%.Desulfurated plaster is following dry 5 hours at 110 ℃, levigate extremely less than 120 orders, get 100g exsiccant desulfurated plaster and sulphur content and be 2.5% exsiccant high sulphur coal mixes with mass ratio and places silica tube to put into to be elevated to 900 ℃ tube type resistance furnace at 11: 1,15 ℃/min of tube type resistance furnace control temperature rise rate, reaction is 2.5 hours under 900 ℃ of-1100 ℃ of temperature, up to outlet flue gas SO
2Content reaches 16%, stops heating, measures the solid slag composition behind the naturally cooling, and calculating the desulfurated plaster rate of decomposition is 97%, desulfurization degree 91.5%.
Embodiment 2: desulfurated plaster main component and weight percent are: CaO 35.05%, SiO
21.32%, Al
2O
30.35%, SO
244.35%, Fe
2O
30.12%, MgO 0.23%, Na
2O 0.80%, and KaO 0.10%, and moisture content and all the other impurity account for 17.68%, adds up to 100%.Desulfurated plaster is following dry 4 hours at 110-120 ℃, get 100g exsiccant desulfurated plaster and sulphur content and be 3.0% high sulphur coal mixes with mass ratio and places silica tube to put into to be elevated to 1000 ℃ tube type resistance furnace at 15: 1,20 ℃/min of tube type resistance furnace control temperature rise rate, reaction is 2 hours under 1000 ℃ of-1100 ℃ of temperature, up to outlet flue gas SO
2Content reaches 16%-18%, stops heating, measures the solid slag composition behind the naturally cooling, and calculating the desulfurated plaster rate of decomposition is 97.5%, desulfurization degree 92.7%.
Embodiment 3: desulfurated plaster main component and weight percent are: CaO 35.01%, SiO
21.56%, Al
2O
30.34%, SO
241.62%, Fe
2O
30.12%, MgO 0.26%, Na
2O 0.90%, and KaO 0.15%, and moisture content and all the other impurity account for 20.04%, adds up to 100%.Desulfurated plaster is following dry 3 hours at 120-130 ℃, get 100g exsiccant desulfurated plaster and sulphur content and be 3.6% exsiccant high sulphur coal mixes with mass ratio and places silica tube to put into to be elevated to 1100 ℃ tube type resistance furnace at 20: 1,25 ℃/min of tube type resistance furnace control temperature rise rate, reaction is 1 hour under 1100 ℃ of-1300 ℃ of temperature, up to outlet flue gas SO
2Content reaches 16.8%, stops heating, measures the solid slag composition behind the naturally cooling, and calculating the desulfurated plaster rate of decomposition is 98%, desulfurization degree 93.2%.
Claims (3)
1, a kind of method of desulfurated plaster comprehensive utilization of resources, it is characterized in that: it is implemented according to the following steps:
1), desulfurization of raw material gypsum and high sulphur coal are carried out drying at 110-130 ℃, sloughs free-water and crystal water, time 3-6 hour;
2), high sulphur coal and dried desulfurated plaster being added the reduction decomposition stove with the ratio of mass ratio 1: 7-20 decomposes, control decomposing furnace temperature rise rate is controlled at 10-25 ℃/min, temperature of reaction is 800-1400 ℃, reaction times 0.5-2.5 hour, and SO in flue gas
2Volumn concentration 〉=16% an o'clock reaction finishes.
2, the method for desulfurated plaster comprehensive utilization of resources according to claim 1 is characterized in that: desulfurization of raw material gypsum main component weight percent is CaO 30-40%, SiO
21.0-2.5%, Al
2O
30.3-0.5%, SO
240.0-50.0%, Fe
2O
30.10-0.15%, MgO 0.15-0.25%, Na
2O 0.8-0.9%, KaO 0.10-0.15%, H
2O 17.0-20.0%.
3, the method for desulfurated plaster comprehensive utilization of resources according to claim 1 and 2 is characterized in that: high sulphur coal sulphur weight percentage is 2.3-3.6%.
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|---|---|---|---|
| CNA2008100586455A CN101314462A (en) | 2008-07-07 | 2008-07-07 | Reclamation comprehensive utilization method for desulfurized gypsum |
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|---|---|---|---|
| CNA2008100586455A CN101314462A (en) | 2008-07-07 | 2008-07-07 | Reclamation comprehensive utilization method for desulfurized gypsum |
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|---|---|
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Family
ID=40105626
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482584A (en) * | 2012-06-15 | 2014-01-01 | 南京理工大学 | Production technology for preparing calcium oxide and sulfur dioxide through utilizing desulfurized gypsum |
| CN103663388A (en) * | 2013-12-06 | 2014-03-26 | 云南创兴建材新技术有限公司 | Method and reactor for preparing high concentration SO2 flue gas by using phosphogypsum through CaS |
| CN103864023A (en) * | 2014-03-11 | 2014-06-18 | 昆明理工大学 | Method for reducing and decomposing ardealite by using ardealite carbonatation tail gas |
| CN106044772A (en) * | 2016-05-25 | 2016-10-26 | 刘松 | Comprehensive utilization method for waste gypsum and high-sulfur coal |
| CN113200522A (en) * | 2021-02-28 | 2021-08-03 | 昆明理工大学 | Decomposition of nonferrous smelting flue gas desulfurization gypsum to prepare H2Method of S |
| CN114890448A (en) * | 2022-06-09 | 2022-08-12 | 北京科技大学 | Resource treatment method of desulfurized gypsum |
| CN115026107A (en) * | 2022-06-09 | 2022-09-09 | 北京科技大学 | Method for desulfurizing desulfurization gypsum by using high-carbon stone coal |
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2008
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| CN103663388B (en) * | 2013-12-06 | 2015-04-22 | 云南创兴建材新技术有限公司 | Method and reactor for preparing high concentration SO2 flue gas by using phosphogypsum through CaS |
| CN103864023A (en) * | 2014-03-11 | 2014-06-18 | 昆明理工大学 | Method for reducing and decomposing ardealite by using ardealite carbonatation tail gas |
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| CN106044772A (en) * | 2016-05-25 | 2016-10-26 | 刘松 | Comprehensive utilization method for waste gypsum and high-sulfur coal |
| CN113200522A (en) * | 2021-02-28 | 2021-08-03 | 昆明理工大学 | Decomposition of nonferrous smelting flue gas desulfurization gypsum to prepare H2Method of S |
| CN114890448A (en) * | 2022-06-09 | 2022-08-12 | 北京科技大学 | Resource treatment method of desulfurized gypsum |
| CN115026107A (en) * | 2022-06-09 | 2022-09-09 | 北京科技大学 | Method for desulfurizing desulfurization gypsum by using high-carbon stone coal |
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