CN110304647A - A kind of dry-process desulfurized ash of utilization society spent acid prepares desulfurized gypsum method and system - Google Patents
A kind of dry-process desulfurized ash of utilization society spent acid prepares desulfurized gypsum method and system Download PDFInfo
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- CN110304647A CN110304647A CN201910700484.3A CN201910700484A CN110304647A CN 110304647 A CN110304647 A CN 110304647A CN 201910700484 A CN201910700484 A CN 201910700484A CN 110304647 A CN110304647 A CN 110304647A
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- 238000001035 drying Methods 0.000 title claims abstract description 61
- 239000002253 acid Substances 0.000 title claims abstract description 33
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 29
- 239000010440 gypsum Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 239000000243 solution Substances 0.000 claims abstract description 37
- 239000007787 solid Substances 0.000 claims abstract description 31
- 238000000926 separation method Methods 0.000 claims abstract description 23
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 239000011259 mixed solution Substances 0.000 claims abstract description 3
- 230000001590 oxidative effect Effects 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 239000000376 reactant Substances 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 210000002966 serum Anatomy 0.000 claims description 6
- 239000000920 calcium hydroxide Substances 0.000 claims description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 claims description 5
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000000047 product Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims description 2
- 239000006228 supernatant Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 26
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001110 calcium chloride Substances 0.000 abstract description 6
- 229910001628 calcium chloride Inorganic materials 0.000 abstract description 6
- RAFRTSDUWORDLA-UHFFFAOYSA-N phenyl 3-chloropropanoate Chemical compound ClCCC(=O)OC1=CC=CC=C1 RAFRTSDUWORDLA-UHFFFAOYSA-N 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 5
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 abstract description 5
- 235000010261 calcium sulphite Nutrition 0.000 abstract description 5
- 239000003546 flue gas Substances 0.000 abstract description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 229910052925 anhydrite Inorganic materials 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 2
- 230000007704 transition Effects 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 39
- 239000004035 construction material Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 235000011116 calcium hydroxide Nutrition 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- HIUDRMPLAJSCKV-UHFFFAOYSA-K [Cl-].[Ca+2].S(=O)([O-])[O-].[Ca+2] Chemical compound [Cl-].[Ca+2].S(=O)([O-])[O-].[Ca+2] HIUDRMPLAJSCKV-UHFFFAOYSA-K 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229940005654 nitrite ion Drugs 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- 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
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The dry-process desulfurized ash that the present invention provides a kind of social spent acid of utilization prepares desulfurized gypsum method and system, includes the following steps: to mix water, dry-process desulfurized ash, stirring prepares dry-process desulfurized ash solution；Social spent acid is added in dry-process desulfurized ash solution, oxygen is passed through and is stirred, oxidation reaction is carried out；Equipment for separating liquid from solid is added in mixed solution, is separated by solid-liquid separation；The solid of solid-liquid separation enters distilling apparatus；It is separated by solid-liquid separation in distilling apparatus, the solid distilled out is as desulfurized gypsum.CaSO in dry-process desulfurized ash of the present invention3Convert desulfurized gypsum CaSO4Conversion ratio up to 99% or more, transformation time≤1.5 hour meet the requirement of JC/T2074-2011 " desulfurized gesso of flue gas ".The present invention makes full use of using social spent acid, realizes the purpose of the treatment of wastes with processes of wastes against one another；It solves after calcium sulfite transition problem while solving calcium chloride in Desulphurization, calcium nitrite problem；Solve the problems, such as that the produced sulfur dioxide (SO2) emissions in reaction process lead to secondary pollution.
Description
Technical field
The invention belongs to fixed-end forces technical field, in particular to a kind of dry-process desulfurized ash using social spent acid prepares de-
Sulphur gypsum method and system.
Background technique
In the industrial processes such as steel, powder (cigarette) dirt, oxysulfide (SO are contained in the flue gas of generationX), nitrogen oxidation
Object (NOX) and CO2Equal pollutants, the sulfur removal technology for the semidry method that wherein the control equipment of sulfur oxides emissions uses, by-product
For dry-process desulfurized ash, the main component of dry-process desulfurized ash is calcium sulfite, calcium carbonate etc., since calcium sulfite is easy decomposition, institute
It raw material is not made with construction material, dry-process desulfurized ash is not also used for the standard of construction material by country, relatively broad at present
Processing mode be to stack or landfill, this does not meet requirement of the country to fixed-end forces.
Application publication number is that the Chinese patent application of CN106316443A discloses the flyash of the ash containing sintering dry desulphurization
Air-entrained concrete building block and preparation method thereof, the powder ash air-entrained concrete building block of the ash containing sintering dry desulphurization, raw material components
Mass percent are as follows: sintering dry desulphurization ash 6%~9%, flyash 62%~68%, quick lime 15%~20%, cement
8%~12%, aluminium powder 1%~2%, the sum of each raw material component mass percent are 100%, at high temperature because of its dry-process desulfurized ash
It is easy to decompose, so its content being added is seldom, is unable to large-scale use dry-process desulfurized ash.
Dry-process desulfurized ash can be prepared desulfurized gypsum, and energy industrialization, entire conversion process using social spent acid by the present invention
Do not pollute.
Summary of the invention
The object of the present invention is to provide a kind of dry-process desulfurized ashs using social spent acid to prepare desulfurized gypsum method and system,
It mainly solves existing to prepare desulfurized gypsum with dry-process desulfurized ash and be difficult to the technical problem of industrialization, generate titanium dioxide in conversion process
The technical issues of sulphur causes secondary pollution to environment dissolves social spent acid.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of dry-process desulfurized ash of utilization society spent acid prepares desulfurized gypsum method, includes the following steps:
Step 1: water, dry-process desulfurized ash being mixed, stirring prepares dry-process desulfurized ash solution；
Step 2: social spent acid being added in dry-process desulfurized ash solution, oxygen is passed through and stirs, carries out oxidation reaction；
Step 3: equipment for separating liquid from solid is added in the mixed solution that step 2 is obtained, and is separated by solid-liquid separation；
Step 4: the solid of solid-liquid separation enters distilling apparatus；
Step 5: being separated by solid-liquid separation in distilling apparatus, the solid distilled out is as desulfurized gypsum.
Preferably, in step 1, the addition mass ratio of dry-process desulfurized ash and water is 1:5~1:4.
Preferably, in step 2, the time of oxidation reaction is 1-1.5 hours, and it is 1.4- that pressure is kept in oxidizing tower
1.5Mpa。
Preferably, in step 2, the concentrated sulfuric acid is added by the pH of dry-process desulfurized ash solution and is adjusted to 4.2-5.5.Desulphurization conversion
Industrialization design solid-to-liquid ratio is 20%, that is, converts 1 ton of dry-process desulfurized ash, need 5 tons of 5% sulfuric acid solution, solid-to-liquid ratio is
20%, it is controlled in 4-5 using pH value as standard, while the sulfuric acid equipped with high concentration makes adjustments used in pH.Calcium carbonate number in Desulphurization
Every increase by 10% is measured, Desulphurization conversion per ton sulfuric acid consumption used need to increase 100Kg.
Preferably, in step 4, separation of solid and liquid is made liquid as reactant in step 2 and dry-process desulfurized ash solution is added
In.
Preferably, in step 4, dry-process desulfurized ash solution is added as reactant in step 2 in the liquid being separated by solid-liquid separation
In before, import precipitation separation device, calcium hydroxide and aluminium hydroxide be added into precipitation separation device, gained sediment is made
It is high-strength cement with addition of agent product, is added acquired solution as reactant in step 2 in dry-process desulfurized ash solution.
A kind of dry-process desulfurized ash of utilization society spent acid prepares desulfurized gypsum system, including serum pot, oxidizing tower, solid-liquid point
From device, distilling apparatus；The serum pot connects oxidizing tower to prepare dry-process desulfurized ash solution, liquid outlet；The oxidation
It is passed through social spent acid, oxygen and dry-process desulfurized ash solution in tower, it is molten that dry-process desulfurized ash occurs under the catalytic action of social spent acid
The oxidation reaction of liquid, liquid outlet connect equipment for separating liquid from solid；The solid outlet of the equipment for separating liquid from solid connects distilling apparatus.
Preferably, the liquid outlet of the distilling apparatus and equipment for separating liquid from solid is all connected with oxidizing tower.
Preferably, the liquid outlet of the equipment for separating liquid from solid connects sedimentation basin, and calcium hydroxide is added in solution in sedimentation basin
And aluminium hydroxide, supernatant outlet connect oxidizing tower.
Preferably, the oxidizing tower gas outlet connects spray equipment, and spray equipment is to wash gas, outlet
The logical atmosphere of mouth.
The utility model has the advantages that CaSO in 1, the method for the present invention dry-process desulfurized ash3Convert desulfurized gypsum CaSO4Conversion ratio up to 99%
More than, transformation time≤1.5 hour meet the requirement of JC/T2074-2011 " desulfurized gesso of flue gas ".
2, the method for the present invention makes full use of using social spent acid, realizes the purpose of the treatment of wastes with processes of wastes against one another；Solves calcium sulfite
Calcium chloride in Desulphurization, calcium nitrite problem are solved after transition problem simultaneously；Solves the produced titanium dioxide in reaction process
Sulphur emissions lead to the problem of secondary pollution.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of present system.
Figure label: 1, oxidizing tower；2, social spent acid storage tank；3, serum pot；4, equipment for separating liquid from solid；5, distilling apparatus；
6, sedimentation basin；7, spray equipment；8, oxidation fan.
Specific embodiment
Below with reference to embodiment, the present invention will be further described.
A method of so that dry-process desulfurized ash is prepared desulfurized gypsum using social spent acid, comprising the following steps:
1) water is passed through the serum pot 3 with agitating function, and adds dry-process desulfurized ash to be oxidized, open blender, it will
It stirs into dry-process desulfurized ash solution；In dry-process desulfurized ash, CaSO3·1/2H2The mass fraction of O is 10-70%, CaCl2Matter
Amount score is 1.5-2%；The adding proportion of dry-process desulfurized ash and water is 1:5~1:4.The solid-to-liquid ratio height meeting of dry-process desulfurized ash solution
There is the calcium sulfite not converted, causes conversion ratio low；Solid-to-liquid ratio is reduced, conversion ratio improves, but production efficiency is low, no
Conducive to large-scale production.
2) dry-process desulfurized ash solution is passed through in the oxidizing tower 1 with agitating function, and social spent acid is input to dry method and is taken off
In sulphur ash solution, and blender is opened, holding pressure is 1.4-1.5MPa, and pressure height meeting energy consumption is high to cause overflowing for gas simultaneously
Out, pressure is low, can cause to react insufficient.The pH of dry-process desulfurized ash solution is adjusted to 5, it is allowed to react 1-1.5 hours, reaction
After, solution is released to equipment for separating liquid from solid 4, and liquid enters oxidizing tower 1.
Reaction mechanism: using air come the calcium sulfite in oxidation dry method Desulphurization, because in acid condition, passing through stirring
All molecules and atom of the inside are all disturbed, therefore react very fast, reaction equation is as follows:
In this reaction, to certain dynamics and thermodynamic condition, when dynamics, is carried out with the blender in oxidizing tower
Stirring, this reaction is exothermic reaction when thermodynamics, meets its oxidizing reaction temperature condition, normal temperature is at 50 DEG C or more.Instead
The catalyst of Ying Shizhong is social spent acid.
3) solution is separated by solid-liquid separation with equipment for separating liquid from solid 4；Separation of solid and liquid is made liquid and returns to oxidizing tower 1, point
The solid separated out enters distilling apparatus 5.CaSO3After fully oxidized, the solution that reaction generates is separated by solid-liquid separation, is separated
Solid afterwards is the relatively stable CaSO generated by sufficiently reaction4, and desulfurized gypsum CaSO4Then in construction material compared with
For stable raw material, building material industry standard JC/T2074-2011 " desulfurized gesso of flue gas " is seen.Chlorine in liquid is made in separation of solid and liquid
The mass fraction for changing calcium is 1.5-2%.
4) it is separated by solid-liquid separation in distilling apparatus 5, the vapor distilled out returns to oxidizing tower 1, the solid conduct left
Desulfurized gypsum.Solid after distillation is directly used in the raw material of construction material, and the acidic liquid after separation and distillation returns again to oxidation
Tower 1 participates in oxidizing condition necessary to oxidation reaction.
Starting whole process does not have secondary pollution to environment, but with calcium chloride in Desulphurization and calcium nitrite solvent soln
Concentration increase, if not being pocessed, the calcium nitrite of precipitation can bring about secondary pollution.Calcium chloride and nitrous acid in Desulphurization
There is calcium larger solubility (to be dissolved in solution after 500g/L or more), processing, every processing is primary, and Chlorine in Solution ion contains
Amount increases by 0.1%, and for denitration Desulphurization, nitrite ion content also will increase about 0.1%.After tens of times of successive reaction,
The solution that equipment for separating liquid from solid 4 is generated imports sedimentation basin 6, will by the way that calcium hydroxide and aluminium hydroxide are added in the apparatus
Calcium chloride, calcium nitrite precipitating, by precipitating gained calcium chloroaluminate (3CaOAl2O3CaCl210H2) and calcium nitrite and calcium nitrate O
Solution is continued return oxidizing tower 1 and used by the precipitating of double salt separately as high-strength cement with addition of agent product.
5) gas that dry-process desulfurized ash solution reaction generates is delivered to spray equipment 7, the lower part of spray equipment 7 is liquid storage
Slot, top are equipped with spray head, are connected between spray head and reservoir by circulating pump, and the top of spray equipment 7 is equipped with gas outlet.
The water that spray equipment 7 sprays washes the dust carried in gas, SO2, gas puts idle discharge after processing.
Sulfur dioxide of the present invention generates reaction equation are as follows:
There are about 5% calcium hydroxides in general slurries, can absorb the sulfur dioxide gas for decomposing and generating, and final gas passes through again
After crossing spray equipment, the double purification of bubbing will be realized.
Desulfurized gypsum CaSO made of the method for the present invention4As construction material, performance indicator meets building material industry standard
The index request of JC/T2074-2011 " desulfurized gesso of flue gas ".
The pressure of the present embodiment is 1.4MPa, solid-to-liquid ratio is 1:5 simultaneously, and embodiment parameter index is shown in Table 1.
1 parameter index of the embodiment of the present invention of table
| Classification | Tested number, t | Oxidization time, h | Conversion ratio | It is whether qualified | Have pollution-free |
| Embodiment 1 | 1 | 1.1 | 96.5 | It is qualified | Nothing |
| Embodiment 2 | 1 | 1.2 | 97.4 | It is qualified | Nothing |
| Embodiment 3 | 1 | 1.3 | 97.8 | It is qualified | Nothing |
| Embodiment 4 | 1 | 1..4 | 98.6 | It is qualified | Nothing |
| Embodiment 5 | 1 | 1.5 | 99.2 | It is qualified | Nothing |
As shown in Table 1, the conversion ratio of dry-process desulfurized ash conversion desulfurized gypsum reaches all 95% or more in embodiment 1-5
Conversion requirements are more than or equal to 90% requirements, while whole process all environment do not have secondary pollution.
It should be noted that above-described embodiment is only presently preferred embodiments of the present invention, there is no for the purpose of limiting the invention
Protection scope, the equivalent substitution or substitution made on the basis of the above all belong to the scope of protection of the present invention.
Claims (10)
1. a kind of dry-process desulfurized ash using social spent acid prepares desulfurized gypsum method, which comprises the steps of:
Step 1: water, dry-process desulfurized ash being mixed, stirring prepares dry-process desulfurized ash solution；
Step 2: social spent acid being added in dry-process desulfurized ash solution, oxygen is passed through and stirs, carries out oxidation reaction；
Step 3: equipment for separating liquid from solid is added in the mixed solution that step 2 is obtained, and is separated by solid-liquid separation；
Step 4: the solid of solid-liquid separation enters distilling apparatus；
Step 5: being separated by solid-liquid separation in distilling apparatus, the solid distilled out is as desulfurized gypsum.
2. a kind of dry-process desulfurized ash using social spent acid according to claim 1 prepares desulfurized gypsum method, feature
It is, in step 1, the addition mass ratio of dry-process desulfurized ash and water is 1:5~1:4.
3. a kind of dry-process desulfurized ash using social spent acid according to claim 1 prepares desulfurized gypsum method, feature
It is, in step 2, the time of oxidation reaction is 1-1.5 hours, and it is 1.4-1.5Mpa that pressure is kept in oxidizing tower.
4. a kind of dry-process desulfurized ash using social spent acid according to claim 1 prepares desulfurized gypsum method, feature
It is, in step 2, the concentrated sulfuric acid is added by the pH of dry-process desulfurized ash solution and is adjusted to 4.2-5.5.
5. a kind of dry-process desulfurized ash using social spent acid according to claim 1 prepares desulfurized gypsum method and system,
It is characterized in that, being separated by solid-liquid separation liquid obtained in step 4 and being added in dry-process desulfurized ash solution as reactant in step 2.
6. a kind of dry-process desulfurized ash using social spent acid according to claim 5 prepares desulfurized gypsum method, feature
It is, in step 4, before the liquid being separated by solid-liquid separation is added in dry-process desulfurized ash solution as reactant in step 2, imports
Precipitation separation device calcium hydroxide and aluminium hydroxide is added into precipitation separation device, using gained sediment as high-strength cement
With addition of agent product, it is added acquired solution as reactant in step 2 in dry-process desulfurized ash solution.
7. a kind of dry-process desulfurized ash using social spent acid prepares desulfurized gypsum system, which is characterized in that including serum pot, oxidation
Tower, equipment for separating liquid from solid, distilling apparatus；The serum pot connects oxidizing tower to prepare dry-process desulfurized ash solution, liquid outlet；
It is passed through social spent acid, oxygen and dry-process desulfurized ash solution in the oxidizing tower, dry method occurs under the catalytic action of social spent acid
The oxidation reaction of Desulphurization solution, liquid outlet connect equipment for separating liquid from solid；The solid outlet of the equipment for separating liquid from solid connects
Distilling apparatus.
8. a kind of system for making dry-process desulfurized ash prepare desulfurized gypsum using social spent acid according to claim 7, special
Sign is that the liquid outlet of the distilling apparatus and equipment for separating liquid from solid is all connected with oxidizing tower.
9. a kind of system for making dry-process desulfurized ash prepare desulfurized gypsum using social spent acid according to claim 7, special
Sign is that the liquid outlet of the equipment for separating liquid from solid connects sedimentation basin, and calcium hydroxide and hydroxide is added in solution in sedimentation basin
Aluminium, supernatant outlet connect oxidizing tower.
10. a kind of system for making dry-process desulfurized ash prepare desulfurized gypsum using social spent acid according to claim 7, special
Sign is that the oxidizing tower gas outlet connects spray equipment, and for spray equipment to wash to gas, gas outlet is logical big
Gas.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111747438A (en) * | 2020-05-25 | 2020-10-09 | 沈阳环境科学研究院 | pH regulation and control multistep stabilization modification method for dry/semi-dry desulfurized fly ash |
| CN114226421A (en) * | 2021-12-23 | 2022-03-25 | 上海电气电站环保工程有限公司 | Treatment method of semidry desulfurization ash |
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| CN101623592A (en) * | 2009-07-31 | 2010-01-13 | 攀枝花新钢钒股份有限公司 | Process for comprehensively treating waste acid and desulfurization ash |
| CN102912445A (en) * | 2012-10-22 | 2013-02-06 | 浙江天蓝环保技术股份有限公司 | Process and device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid |
| TWI406820B (en) * | 2010-08-17 | 2013-09-01 | Univ Nat Taipei Technology | Treatment of chlorine - containing wastewater |
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| CN101623592A (en) * | 2009-07-31 | 2010-01-13 | 攀枝花新钢钒股份有限公司 | Process for comprehensively treating waste acid and desulfurization ash |
| TWI406820B (en) * | 2010-08-17 | 2013-09-01 | Univ Nat Taipei Technology | Treatment of chlorine - containing wastewater |
| CN102912445A (en) * | 2012-10-22 | 2013-02-06 | 浙江天蓝环保技术股份有限公司 | Process and device for preparing gypsum whisker by semi-dry desulfurized fly ash and waste acid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111747438A (en) * | 2020-05-25 | 2020-10-09 | 沈阳环境科学研究院 | pH regulation and control multistep stabilization modification method for dry/semi-dry desulfurized fly ash |
| CN111747438B (en) * | 2020-05-25 | 2022-12-06 | 沈阳环境科学研究院 | pH regulation and control multistep stabilization modification method for dry/semi-dry desulfurized fly ash |
| CN114226421A (en) * | 2021-12-23 | 2022-03-25 | 上海电气电站环保工程有限公司 | Treatment method of semidry desulfurization ash |
| CN114226421B (en) * | 2021-12-23 | 2024-03-15 | 上海电气电站环保工程有限公司 | Treatment method of semi-dry desulfurization ash |
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