CN106517629A - Limestone/gypsum desulfurization wastewater zero-discharge treatment equipment and limestone/gypsum desulfurization wastewater zero-discharge treatment method - Google Patents
Limestone/gypsum desulfurization wastewater zero-discharge treatment equipment and limestone/gypsum desulfurization wastewater zero-discharge treatment method Download PDFInfo
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- CN106517629A CN106517629A CN201611234882.3A CN201611234882A CN106517629A CN 106517629 A CN106517629 A CN 106517629A CN 201611234882 A CN201611234882 A CN 201611234882A CN 106517629 A CN106517629 A CN 106517629A
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- Prior art keywords
- limestone
- desulfurization wastewater
- gypsum method
- discharge treatment
- crystal
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- 239000002351 wastewater Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 80
- 235000019738 Limestone Nutrition 0.000 title claims abstract description 55
- 239000006028 limestone Substances 0.000 title claims abstract description 55
- 239000010440 gypsum Substances 0.000 title claims abstract description 52
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 52
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 45
- 230000023556 desulfurization Effects 0.000 title claims abstract description 44
- 208000028659 discharge Diseases 0.000 title claims abstract description 26
- 239000013078 crystal Substances 0.000 claims abstract description 80
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 68
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 50
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 25
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 25
- 238000002425 crystallisation Methods 0.000 claims abstract description 11
- 230000008025 crystallization Effects 0.000 claims abstract description 11
- 238000001556 precipitation Methods 0.000 claims abstract description 8
- 239000012452 mother liquor Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 4
- 239000011833 salt mixture Substances 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 3
- 235000011132 calcium sulphate Nutrition 0.000 claims description 31
- 238000012546 transfer Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 10
- 239000001175 calcium sulphate Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 239000012141 concentrate Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000004069 wastewater sedimentation Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011575 calcium Substances 0.000 abstract description 3
- 229910052791 calcium Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 5
- 229910001425 magnesium ion Inorganic materials 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 241000370738 Chlorion Species 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 102000005701 Calcium-Binding Proteins Human genes 0.000 description 1
- 108010045403 Calcium-Binding Proteins Proteins 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- ZGBSOTLWHZQNLH-UHFFFAOYSA-N [Mg].S(O)(O)(=O)=O Chemical compound [Mg].S(O)(O)(=O)=O ZGBSOTLWHZQNLH-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- GJYLKIZKRHDRER-UHFFFAOYSA-N calcium;sulfuric acid Chemical compound [Ca].OS(O)(=O)=O GJYLKIZKRHDRER-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- 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
- C01F5/00—Compounds of magnesium
- C01F5/40—Magnesium sulfates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The invention discloses limestone/gypsum desulfurization wastewater zero-discharge treatment equipment and a limestone/gypsum desulfurization wastewater zero-discharge treatment method. The equipment comprises a low-temperature concentration device, a precipitation and crystallization filter, a stirrer, a magnesium sulfate crystallizer and a vacuum-pumping system. The method includes the steps of subjecting limestone/gypsum desulfurization wastewater to low-temperature concentration, wherein calcium sulfate in the wastewater during concentration is removed in the form of crystals; subjecting concentrated liquor with the calcium sulfate crystals removed to evaporative cooling and crystallization so as to obtain magnesium sulfate crystals and residual mother liquor, removing heavy metals from the residual mother liquor and conducting evaporative crystallization so as to obtain a salt mixture. The limestone/gypsum desulfurization wastewater zero-discharge treatment equipment and the limestone/gypsum desulfurization wastewater zero-discharge treatment method have the advantages that low-temperature concentration is combined with a precipitation and crystallization type calcium removing technology, and accordingly excessive chemicals are avoided and material selection is facilitated; the concentration device and a precipitation and crystallization structure are simple, and the calcium sulfate in the wastewater is removed in the form of crystals, so that the equipment can be effectively prevented from being corroded and scaled; the magnesium sulfate is produced in the technological process, so that the problem of high costs caused by softening in the concentration technological process in the prior art is avoided.
Description
Technical field
The invention belongs to limestone/gypsum method desulfurization wastewater processing technology field, more particularly to a kind of limestone/gypsum
Method desulfurization wastewater zero discharge treatment equipment, and limestone/gypsum method method for treating desulfurized wastewater, realize salt in desulfurization wastewater
Constituents recycling.
Background technology
High-salt wastewater process is a wastewater treatment difficult problem for industry-by-industry, from the wastewater zero discharge project for having put into operation both at home and abroad
See, softening+concentration+evaporative crystallization is wastewater zero discharge prevailing technology, other technologies, be in development more.Limestone/gypsum
Method desulfurization wastewater is typical high-salt wastewater, and Main Anions are：Sulfate radical, chlorion and fluorine ion, cation is：Calcium from
Son, magnesium ion, sodium ion, potassium ion and part heavy metal ion.
During conventional limestone/gypsum desulfurization wastewater process, PH is adjusted initially with calcium hydroxide is added in three headers
To 9 or so, in calcium hydroxide adition process, a large amount of magnesium ions in desulfurization wastewater are combined generation hydroxide with hydroxide ion
Magnesium precipitate is discharged with sludge form becomes solid waste, while the sulfate radical in desulfurization wastewater generates calcium sulfate with calcium binding
Precipitation is discharged with sludge form also becomes solid waste；In follow-up wastewater zero discharge processing procedure, adopting concentration process more
Film is concentrated, very high to waste water hardness requirement, and in system, the magnesium ion of excessive calcium ion and remnants need to add sodium carbonate to give birth to
Remove into magnesium carbonate and calcium carbonate, dosing cost is very high, the quantity of solid waste of generation is also very big, useful sulfuric acid in waste water
Magnesium cannot be recycled.
Magnesium in limestone/gypsum method desulfurization wastewater derives from lime stone used, and 1.5% is typically contained in lime stone
(Wt) magnesia of left and right, due to the ready dissolution of magnesium sulfate, the magnesium-based sheet in lime stone is occurred in de- in the form of magnesium sulfate
In sulphur waste water.According to before processing desulfurization wastewater composition analysis investigation result, in limestone/gypsum method desulfurization wastewater, magnesium ion contains
Power plant of the amount more than 10000mg/L accounts for about 30%, and the power plant more than 5000mg/L accounts for about 70%, and exploitation is extracted at the new waste water of magnesium sulfate
Science and engineering skill has certain environment protection significance and economic worth.
The content of the invention
It is an object of the invention to provide a kind of limestone/gypsum method desulfurization wastewater zero discharge treatment device and method, to solve
The problem that certainly during the zero-emission of limestone/gypsum method desulfurization wastewater chemical feeding quantity is big and magnesium sulfate cannot be recycled.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of limestone/gypsum method desulfurization wastewater zero-emission
Processing equipment, which includes：Low-temperature concentration device, precipitated crystal filter, agitator, magnesium sulfate crystallizer and pumped vacuum systems；
The inlet of the Low-temperature concentration device is connected with limestone/gypsum method desulfurization wastewater feed pipe；The precipitated crystal mistake
The inlet of filter is connected with the liquid outlet of Low-temperature concentration device；Calcium sulfate crystal seed is placed with precipitated crystal filter；It is described to stir
Mix device to be arranged in precipitated crystal filter；The inlet of the magnesium sulfate crystallizer is connected with the liquid outlet of precipitated crystal filter
It is logical；The pumped vacuum systems is for vacuumizing to the magnesium sulfate crystallizer.
Limestone/gypsum method desulfurization wastewater zero discharge treatment equipment as above of the invention, further, precipitated crystal mistake
The liquid outlet of filter is also by the inlet of pipeline connection Low-temperature concentration device.
Limestone/gypsum method desulfurization wastewater zero discharge treatment equipment as above of the invention, further, low temperature concentration dress
Multiple board-like mass-and heat-transfer devices, the sieve tray that board-like mass-and heat-transfer device includes base plate and is obliquely installed are provided with putting；It is described
One side of sieve tray is connected with base plate.
Limestone/gypsum method desulfurization wastewater zero discharge treatment equipment as above of the invention, further, adjacent is board-like
Interval setting between mass-and heat-transfer device, board-like mass-and heat-transfer device are detachably arranged in Low-temperature concentration device by support member
It is interior.
Of the invention as above limestone/gypsum method desulfurization wastewater zero discharge treatment equipment, further, sieve tray inclines
Gradient is 15 degree～60 degree, and the percent opening of sieve tray is 10%～30%, and perforate is elliptical aperture or circular hole, it is preferred that the length of perforate
Width is in the range of 10mmx30mm.
A kind of limestone/gypsum method zero emission treatment of desulfured waste water, comprises the following steps：Limestone/gypsum method takes off
Sulphur waste water is concentrated under cryogenic, and the calcium sulfate in concentration process in waste water is removed with crystal form；To having removed desulfuration
Concentrate after sour calcium crystal is evaporated decrease temperature crystalline, obtains magnesium sulfate crystals and remaining mother liquor, a remaining mother liquor removing huge sum of money
Category, then Jing evaporative crystallizations obtain salt-mixture.
Limestone/gypsum method zero emission treatment of desulfured waste water as above of the invention, it is preferred that cryogenic conditions institute
The temperature range of finger is 60 DEG C～70 DEG C.
Limestone/gypsum method zero emission treatment of desulfured waste water as above of the invention, it is preferred that in concentration process
Calcium sulfate in waste water is carried out in precipitated crystal filter with the detailed process that crystal form is removed, and is had in precipitated crystal device
The calcium sulfate crystal seed being placed in advance in, waste water is mixed with calcium sulfate crystal seed in precipitated crystal device makes calcium sulphate crystal grow up, sulfuric acid
Calcium crystal is trapped in precipitated crystal device by filtration, and filtrate re-starts low temperature after mixing with limestone/gypsum method desulfurization wastewater
Under the conditions of the process that concentrates.
Limestone/gypsum method zero emission treatment of desulfured waste water as above of the invention, it is preferred that the calcium sulfate
The diameter range of crystal seed is at 80 microns～100 microns.
Limestone/gypsum method zero emission treatment of desulfured waste water as above of the invention, it is preferred that waste water is in precipitation
Sedimentation time in crystallizer be 20min～35min, waste water is stirred in infall process, mixing time be 8min～
15min。
The invention has the beneficial effects as follows：
1st, using low temperature concentration with reference to precipitated crystal deliming technique, without excessive chemical agent, easy selection.
2nd, enrichment facility and precipitated crystal filtration device structure are simple, and the calcium sulfate in waste water is removed with crystal form, prevent
Equipment corrosion and good antiscale property effect are good.
3rd, technical process production magnesium sulfate, avoids prior art concentration technology（As reverse osmosis concentration, electrodialysis are concentrated
Deng）During due to need soften bring high cost, costly problem.
4th, reduce the solid waste discharge capacity of process, magnesium sulfate is utilized effectively in waste water, invest low, energy consumption it is low,
Operating cost is low.
Description of the drawings
Fig. 1 is limestone/gypsum method desulfurization wastewater zero discharge treatment equipment schematic diagram；
Individual board-like mass-and heat-transfer schematic devices of the Fig. 2 for an embodiment of the present invention；
Schematic top plan views of the Fig. 3 for Fig. 2.
In accompanying drawing, the list of parts representated by each label is as follows：
1st, Low-temperature concentration device, 2, precipitated crystal filter, 3, agitator, 4, pipeline, 5, magnesium sulfate crystallizer, 6, vacuumize and be
System, 7, calcium sulfate crystal seed, 8, board-like mass-and heat-transfer device, 81, sieve tray, 82, base plate, 83, sieve aperture, 9, feed pipe.
Specific embodiment
The embodiment that here is recorded is the specific specific embodiment of the present invention, for illustrating the design of the present invention,
It is explanatory and exemplary, should not be construed as the restriction to embodiment of the present invention and the scope of the invention.Except here record
Implement exception, those skilled in the art can also be based on the application claims and specification disclosure of that using aobvious and
Other technical schemes being clear to, these technical schemes include any obvious using making for the embodiment recorded to here
The technical scheme of substitutions and modifications.
Fig. 1 illustrates the limestone/gypsum method desulfurization wastewater zero discharge treatment equipment of an embodiment of the present invention, and which includes：
Low-temperature concentration device 1, precipitated crystal filter 2, agitator 3, magnesium sulfate crystallizer 5 and pumped vacuum systems 6；
The inlet of the Low-temperature concentration device is connected with limestone/gypsum method desulfurization wastewater feed pipe 9；The precipitated crystal mistake
The inlet of filter is connected with the liquid outlet of Low-temperature concentration device；Calcium sulfate crystal seed 7 is placed with precipitated crystal filter 2；It is described
Agitator 3 is arranged in precipitated crystal filter 2；The inlet of the magnesium sulfate crystallizer goes out liquid with precipitated crystal filter
Mouth connection；The pumped vacuum systems 6 is for vacuumizing to the magnesium sulfate crystallizer 5.
In the embodiment illustrated in figure 1, the liquid outlet of precipitated crystal filter also connects low temperature concentration dress by pipeline 4
The inlet put.In precipitated crystal filter remove calcium sulfate after filtrate Low-temperature concentration device inlet with it is fresh enter
The concentration under cryogenic conditions is re-started after material mixing.
In a preferred embodiment, multiple board-like mass-and heat-transfer devices 8 are provided with Low-temperature concentration device, such as Fig. 2 and Fig. 3 institutes
Show, board-like mass-and heat-transfer device 8 includes base plate 82 and the sieve tray 81 being obliquely installed（It is provided with sieve aperture 83）；The sieve tray 81
While being connected with base plate 82.
In a preferred embodiment, interval setting, board-like mass-and heat-transfer device between adjacent board-like mass-and heat-transfer device 8
8 are detachably arranged in Low-temperature concentration device 1 by support member.
In a preferred embodiment, the gradient of sieve tray is 10 degree～60 degree, and the percent opening of sieve tray is 10%～30%,
Perforate is elliptical aperture or circular hole in the range of 10mmx30mm.
Limestone/gypsum method desulfurization wastewater is carried out using above-mentioned limestone/gypsum method desulfurization wastewater zero discharge treatment equipment
Zero discharge treatment method, comprises the following steps：
Limestone/gypsum method desulfurization wastewater is concentrated under cryogenic, and the calcium sulfate in concentration process in waste water is with crystal form
It is removed；Concentration process adopts directly contact mass-and heat-transfer process to limestone/gypsum method desulfurization wastewater under cryogenic.
The temperature range of cryogenic conditions indication is 60 DEG C～90 DEG C.Calcium sulfate in concentration process in waste water is with crystal form
The detailed process being removed is carried out in precipitated crystal filter, has the calcium sulfate crystal seed being placed in advance in precipitated crystal device, is given up
Water is mixed with calcium sulfate crystal seed in precipitated crystal device makes calcium sulphate crystal grow up, and calcium sulphate crystal is trapped in precipitation knot by filtration
In brilliant device, filtrate re-starts the process concentrated under cryogenic conditions after mixing with limestone/gypsum method desulfurization wastewater.Preferred
In embodiment, the diameter range of the calcium sulfate crystal seed is at 80 microns～100 microns.In a preferred embodiment, waste water is heavy
Sedimentation time in the crystallizer of shallow lake is 20min～35min, waste water is stirred in infall process, and mixing time is 10min
～20min.
Cooling evaporative crystallization is carried out to having removed the concentrate after calcium sulphate crystal, magnesium sulfate crystals is obtained and residue is female
Liquid；Remaining mother liquor removes heavy metal, and then Jing evaporative crystallizations obtain salt-mixture.
A kind of embodiment of above-mentioned specific embodiment is：In certain power plant's limestone/gypsum method desulfurization wastewater, calcium ion contains
Measure as 1000mg/L, magnesium ion content is 12000mg/L, sodium ion is 1200mg/L, sulfate radical is 25000mg/L, chlorion
For 20000mg/L, pH value 6.3, Low-temperature concentration device is entered Jing precipitation and after filtering, be concentrated to close in Low-temperature concentration device
Saturated mode, Low-temperature concentration device circular route are provided with precipitated crystal filter, have the calcium sulfate being placed in advance in precipitated crystal device
Crystal seed, saturated mode solution are mixed with crystal seed in precipitated crystal device, make crystal grow up, and crystal is trapped in precipitated crystal device by filtration
In, filtrate returns to enrichment facility after mixing with fresh feed.Precipitated crystal filter is provided with agitator, in constantly concentration and crystallization
In filter process, the calcium sulfate in solution is removed.Solution is concentrated to the saturated concentration of crystalline sulfuric acid magnesium in enrichment facility
When, magnesium sulfate crystallizer is admitted to, magnesium sulfate crystallizer is furnished with pumped vacuum systems, is further concentrated Jing after vacuum flashing cooling
And then obtain magnesium sulfate crystals.
Each technical characteristic of above-mentioned disclosure is not limited to disclosed and further feature combination, and those skilled in the art are also
Can according to the purpose of invention carry out between each technical characteristic other combination, to realize that the purpose of the present invention is defined.
Claims (10)
1. a kind of limestone/gypsum method desulfurization wastewater zero discharge treatment equipment, it is characterised in that include：It is Low-temperature concentration device, heavy
Shallow lake crystal filter, agitator, magnesium sulfate crystallizer and pumped vacuum systems；
The inlet of the Low-temperature concentration device is connected with limestone/gypsum method desulfurization wastewater feed pipe；The precipitated crystal mistake
The inlet of filter is connected with the liquid outlet of Low-temperature concentration device；Calcium sulfate crystal seed is placed with precipitated crystal filter；It is described to stir
Mix device to be arranged in precipitated crystal filter；The inlet of the magnesium sulfate crystallizer is connected with the liquid outlet of precipitated crystal filter
It is logical；The pumped vacuum systems is for vacuumizing to the magnesium sulfate crystallizer.
2. limestone/gypsum method desulfurization wastewater zero discharge treatment equipment according to claim 1, it is characterised in that precipitation
The liquid outlet of crystal filter is also by the inlet of pipeline connection Low-temperature concentration device.
3. limestone/gypsum method desulfurization wastewater zero discharge treatment equipment according to claim 1 and 2, it is characterised in that low
Multiple board-like mass-and heat-transfer devices, the sieve aperture that board-like mass-and heat-transfer device includes base plate and is obliquely installed are provided with warm enrichment facility
Plate；One side of the sieve tray is connected with base plate.
4. limestone/gypsum method desulfurization wastewater zero discharge treatment equipment according to claim 3, it is characterised in that adjacent
Board-like mass-and heat-transfer device between interval setting, it is dense that board-like mass-and heat-transfer device is detachably arranged in low temperature by support member
In compression apparatus.
5. limestone/gypsum method desulfurization wastewater zero discharge treatment equipment according to claim 3, it is characterised in that sieve aperture
The gradient of plate is 15 degree～60 degree, and the percent opening of sieve tray is 10%～30%, and perforate is elliptical aperture or circular hole, the length and width of perforate
In the range of 10mmx30mm.
6. a kind of limestone/gypsum method zero emission treatment of desulfured waste water, methods described utilize any one of claim 1-5 institute
Processing equipment realization is stated, is comprised the following steps：Limestone/gypsum method desulfurization wastewater is concentrated under cryogenic, in concentration process
Calcium sulfate in waste water is removed with crystal form；Cooling knot is evaporated to having removed the concentrate after calcium sulphate crystal
Crystalline substance, obtains magnesium sulfate crystals and remaining mother liquor, and remaining mother liquor removes heavy metal, and then Jing evaporative crystallizations obtain salt-mixture.
7. limestone/gypsum method zero emission treatment of desulfured waste water according to claim 6, it is characterised in that low temperature
The temperature range of condition indication is 60 DEG C～70 DEG C.
8. limestone/gypsum method zero emission treatment of desulfured waste water according to claim 6, it is characterised in that concentration
During calcium sulfate in waste water carried out in precipitated crystal filter with the detailed process that crystal form is removed, precipitated crystal
There is the calcium sulfate crystal seed being placed in advance in device, waste water is mixed with calcium sulfate crystal seed in precipitated crystal device makes calcium sulphate crystal long
Greatly, calcium sulphate crystal is trapped in precipitated crystal device by filtration, and filtrate is entered after being mixed with limestone/gypsum method desulfurization wastewater again
The process concentrated under row cryogenic conditions.
9. limestone/gypsum method zero emission treatment of desulfured waste water according to claim 8, it is characterised in that described
The diameter range of calcium sulfate crystal seed is at 80 microns～100 microns.
10. limestone/gypsum method zero emission treatment of desulfured waste water according to claim 8, it is characterised in that waste water
Sedimentation time in precipitated crystal device is 20min～35min, waste water is stirred in infall process, and mixing time is
8min～15min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611234882.3A CN106517629A (en) | 2016-12-28 | 2016-12-28 | Limestone/gypsum desulfurization wastewater zero-discharge treatment equipment and limestone/gypsum desulfurization wastewater zero-discharge treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611234882.3A CN106517629A (en) | 2016-12-28 | 2016-12-28 | Limestone/gypsum desulfurization wastewater zero-discharge treatment equipment and limestone/gypsum desulfurization wastewater zero-discharge treatment method |
Publications (1)
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| CN112875829A (en) * | 2021-01-25 | 2021-06-01 | 江苏海容热能环境工程有限公司 | Desulfurization wastewater purification system and purification method based on self-crystallization fluidized bed |
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