CN112919503A - Zero-discharge process for desulfurization wastewater and desulfurization slag - Google Patents
Zero-discharge process for desulfurization wastewater and desulfurization slag Download PDFInfo
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- CN112919503A CN112919503A CN202110201021.XA CN202110201021A CN112919503A CN 112919503 A CN112919503 A CN 112919503A CN 202110201021 A CN202110201021 A CN 202110201021A CN 112919503 A CN112919503 A CN 112919503A
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- desulfurization
- slag
- desulfurization wastewater
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 75
- 230000023556 desulfurization Effects 0.000 title claims abstract description 75
- 239000002351 wastewater Substances 0.000 title claims abstract description 44
- 239000002893 slag Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 30
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 48
- 239000000243 solution Substances 0.000 claims abstract description 29
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 26
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 24
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 24
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 18
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 18
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 18
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 18
- 239000012065 filter cake Substances 0.000 claims abstract description 17
- 239000000706 filtrate Substances 0.000 claims abstract description 13
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 13
- 235000017550 sodium carbonate Nutrition 0.000 claims abstract description 11
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims abstract description 10
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims abstract description 10
- 239000001099 ammonium carbonate Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims abstract description 9
- 235000011130 ammonium sulphate Nutrition 0.000 claims abstract description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000012047 saturated solution Substances 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims description 10
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 8
- 239000000920 calcium hydroxide Substances 0.000 claims description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 8
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 239000010440 gypsum Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/02—Preparation by double decomposition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/026—Preparation of ammonia from inorganic compounds
- C01C1/028—Preparation of ammonia from inorganic compounds from ammonium sulfate or sulfite
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
-
- 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 a zero discharge process of desulfurization wastewater and desulfurization slag, which is characterized in that desulfurization wastewater is evaporated and concentrated to obtain desulfurization wastewater concentrated solution; dissolving the desulfurization slag in the desulfurization wastewater concentrated solution; filter-pressing the materials through a plate frame to obtain a saturated solution with main components of sodium sulfate, sodium carbonate and sodium bicarbonate and a filter cake; wherein, the main components of the filter cake comprise generated calcium carbonate and undissolved carbon powder in the raw slag; transporting the filter cake to a sintering plant for ore blending; and (3) adding excessive ammonium bicarbonate into the clear liquid and the filtrate obtained by plate-and-frame filter pressing, and carrying out double decomposition reaction on the ammonium bicarbonate and sodium sulfate to generate a solution of the combination of ammonium sulfate and sodium bicarbonate. The invention provides a process method better used for treating desulfurization wastewater and desulfurization slag, in particular provides a process for treating desulfurization slag while treating desulfurization wastewater, which realizes zero emission and achieves creative use effects.
Description
Technical Field
The invention relates to a zero discharge process of desulfurization wastewater and desulfurization slag, belonging to the technical field of environment-friendly discharge of desulfurization wastewater and desulfurization slag.
Background
The desulfurization waste water is mainly the discharge water of an absorption tower in the wet desulfurization (limestone/gypsum method) process of boiler flue gas. In order to maintain the balance of the mass of the slurry circulation system of the desulfurization unit, prevent the soluble fraction of the flue gas, i.e., the chlorine concentration, from exceeding the specified value and ensure the quality of gypsum, a certain amount of waste water must be discharged from the system, which is mainly from the gypsum dewatering and cleaning system. The impurities contained in the wastewater mainly comprise suspended matters, supersaturated sulfite, sulfate and heavy metals, and many of the impurities are the first pollutants which are strictly controlled in the national environmental protection standard. In the prior art, no process method which is better used for treating desulfurization wastewater and desulfurization slag, particularly no process for treating desulfurization slag while treating desulfurization wastewater, can not realize zero emission in a real sense, and further can not achieve creative use effects. Therefore, a zero discharge process of desulfurization wastewater and desulfurization slag is urgently needed to solve the problem in the prior art.
In order to solve the technical problems, a new technical scheme is especially provided.
Disclosure of Invention
The invention aims to provide a zero discharge process of desulfurization wastewater and desulfurization slag, which aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a zero-discharge process for desulfurization wastewater and desulfurization slag comprises the following steps:
step one, evaporating and concentrating the desulfurization wastewater to obtain a desulfurization wastewater concentrated solution;
dissolving the desulfurization slag in the desulfurization wastewater concentrated solution;
step three, performing plate-and-frame filter pressing on the material generated in the step two to obtain a saturated solution with main components of sodium sulfate, sodium carbonate and sodium bicarbonate and obtain a filter cake; wherein, the main components of the filter cake comprise generated calcium carbonate and undissolved carbon powder in the raw slag;
transporting the filter cake to a sintering plant for ore blending;
adding excessive ammonium bicarbonate into the clear liquid and the filtrate obtained by the three-plate frame filter pressing in the step, and carrying out double decomposition reaction on the ammonium bicarbonate and the sodium sulfate to generate a solution combining ammonium sulfate and sodium bicarbonate;
step six, filtering the solution obtained in the step five by using a vacuum belt filter, wherein the main component of a filter cake generated by filtering is sodium bicarbonate, and the components of a filtrate generated by filtering comprise sodium sulfate, sodium carbonate, sodium bicarbonate and ammonium sulfate;
and step seven, adding excessive calcium hydroxide into the filtrate obtained in the step six for reaction to generate ammonia gas for denitration, putting the precipitate settled by the inclined tube into a desulfurization tower to be used as a desulfurizer, and removing slag washing or sintering and spraying the remaining clear liquid.
Preferably, the desulfurized wastewater of step one is evaporated and concentrated three times.
Preferably, in the second step, in the process of dissolving the desulfurization residue in the desulfurization wastewater concentrated solution, the sodium sulfate, the sodium carbonate and the sodium bicarbonate can be completely dissolved and nearly saturated theoretically, except for the carbon powder and insoluble substances.
Preferably, the solution of the fifth step is saturated with sodium bicarbonate originally in the solution, so that all the generated sodium bicarbonate is precipitated.
Preferably, the main components of the precipitate obtained after the sedimentation in the inclined tube in the step seven are calcium hydroxide, calcium carbonate and calcium sulfate.
Compared with the prior art, the invention has the beneficial effects that: provides a process method which is better used for treating the desulfurization waste water and the desulfurization slag, in particular provides a process for realizing the treatment of the desulfurization slag while treating the desulfurization waste water, realizes zero emission and achieves the creative using effect.
Drawings
FIG. 1 is a schematic block diagram of the ingredients and contents of materials required by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached drawings of the specification, the invention provides a technical scheme that: a zero-discharge process for desulfurization wastewater and desulfurization slag comprises the following steps:
step one, evaporating and concentrating the desulfurization wastewater to obtain a desulfurization wastewater concentrated solution;
dissolving the desulfurization slag in the desulfurization wastewater concentrated solution;
step three, performing plate-and-frame filter pressing on the material generated in the step two to obtain a saturated solution with main components of sodium sulfate, sodium carbonate and sodium bicarbonate and obtain a filter cake; wherein, the main components of the filter cake comprise generated calcium carbonate and undissolved carbon powder in the raw slag;
transporting the filter cake to a sintering plant for ore blending;
adding excessive ammonium bicarbonate into the clear liquid and the filtrate obtained by the three-plate frame filter pressing in the step, and carrying out double decomposition reaction on the ammonium bicarbonate and the sodium sulfate to generate a solution combining ammonium sulfate and sodium bicarbonate;
step six, filtering the solution obtained in the step five by using a vacuum belt filter, wherein the main component of a filter cake generated by filtering is sodium bicarbonate, and the components of a filtrate generated by filtering comprise sodium sulfate, sodium carbonate, sodium bicarbonate and ammonium sulfate;
and step seven, adding excessive calcium hydroxide into the filtrate obtained in the step six for reaction to generate ammonia gas for denitration, putting the precipitate settled by the inclined tube into a desulfurization tower to be used as a desulfurizer, and removing slag washing or sintering and spraying the remaining clear liquid.
Preferably, the desulfurized wastewater of step one is evaporated and concentrated three times.
Preferably, in the process of dissolving the desulfurization residue in the desulfurization wastewater concentrated solution in the second step, the sodium sulfate, the sodium carbonate and the sodium bicarbonate can be completely dissolved and nearly saturated theoretically, except for carbon powder and insoluble substances.
Preferably, the solution in the fifth step is saturated with sodium bicarbonate originally in the solution, so that all the generated sodium bicarbonate is precipitated.
Preferably, the main components of the precipitate after the inclined tube sedimentation in the step seven are calcium hydroxide, calcium carbonate and calcium sulfate.
Example 1
Step 1, evaporating and concentrating three times at 35m3/h (36t/h) to obtain concentrated solution at 12t/h and the temperature of about 60 ℃;
and step 2, 20000t/a of desulfurized slag is calculated according to 8000h of annual output, and the treatment capacity of the desulfurized slag is as follows: 2500 kg/h;
3, dissolving the desulfurization slag in the desulfurization wastewater concentrated solution, wherein theoretically, except carbon powder and insoluble substances, sodium sulfate, sodium carbonate and sodium bicarbonate can be completely dissolved and are nearly saturated;
and 4, carrying out plate-and-frame filter pressing on the material generated in the step 3 to obtain a saturated solution with main components of sodium sulfate, sodium carbonate and sodium bicarbonate, wherein the filter cake only contains generated calcium carbonate, carbon powder and other solids which are not dissolved in the raw slag. The solid is sent to a sintering plant for ore blending;
and 5, adding excessive ammonium bicarbonate into the clear liquid and the filtrate obtained in the step 4, and carrying out double decomposition reaction on the ammonium bicarbonate and the sodium sulfate to generate ammonium sulfate and sodium bicarbonate. Because the original sodium bicarbonate in the solution is saturated, the generated sodium bicarbonate is completely separated out;
filtering the solution obtained in the step 5 by using a vacuum belt filter, wherein the main component of a filter cake is sodium bicarbonate, and the components of a filtrate are relatively complex and contain sodium sulfate, sodium carbonate, sodium bicarbonate, ammonium sulfate and the like;
and 7, adding excessive calcium hydroxide into the filtrate obtained in the step 6 for reaction to generate ammonia gas for denitration, putting the precipitate (the main components are calcium hydroxide, calcium carbonate, calcium sulfate and the like) after the precipitation through the inclined tube into a desulfurizing tower to be used as a desulfurizing agent, and removing slag by flushing or sintering and spraying ore by the remaining clear liquid.
By adopting the mode, the process method which is better used for treating the desulfurization wastewater and the desulfurization slag is realized, particularly, the process for treating the desulfurization slag while treating the desulfurization wastewater is realized, zero emission is realized, and the creative using effect is achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The zero discharge process of the desulfurization wastewater and the desulfurization slag is characterized by comprising the following steps of:
step one, evaporating and concentrating the desulfurization wastewater to obtain a desulfurization wastewater concentrated solution;
dissolving the desulfurization slag in the desulfurization wastewater concentrated solution;
step three, performing plate-and-frame filter pressing on the material generated in the step two to obtain a saturated solution with main components of sodium sulfate, sodium carbonate and sodium bicarbonate and obtain a filter cake; wherein, the main components of the filter cake comprise generated calcium carbonate and undissolved carbon powder in the raw slag;
transporting the filter cake to a sintering plant for ore blending;
adding excessive ammonium bicarbonate into the clear liquid and the filtrate obtained by the three-plate frame filter pressing in the step, and carrying out double decomposition reaction on the ammonium bicarbonate and the sodium sulfate to generate a solution combining ammonium sulfate and sodium bicarbonate;
step six, filtering the solution obtained in the step five by using a vacuum belt filter, wherein the main component of a filter cake generated by filtering is sodium bicarbonate, and the components of a filtrate generated by filtering comprise sodium sulfate, sodium carbonate, sodium bicarbonate and ammonium sulfate;
and step seven, adding excessive calcium hydroxide into the filtrate obtained in the step six for reaction to generate ammonia gas for denitration, putting the precipitate settled by the inclined tube into a desulfurization tower to be used as a desulfurizer, and removing slag washing or sintering and spraying the remaining clear liquid.
2. The desulfurization wastewater and desulfurization slag zero-discharge process of claim 1, which is characterized in that: and evaporating and concentrating the desulfurization wastewater in the first step three times.
3. The desulfurization wastewater and desulfurization slag zero-discharge process of claim 1, which is characterized in that: in the second step, in the process of dissolving the desulfurization slag in the desulfurization wastewater concentrated solution, theoretically, except carbon powder and insoluble substances, sodium sulfate, sodium carbonate and sodium bicarbonate can be completely dissolved and are close to saturation.
4. The desulfurization wastewater and desulfurization slag zero-discharge process of claim 1, which is characterized in that: in the solution of the fifth step, the sodium bicarbonate originally in the solution is saturated, so that all the generated sodium bicarbonate is precipitated.
5. The desulfurization wastewater and desulfurization slag zero-discharge process of claim 1, which is characterized in that: and the main components of the sediment obtained after the sedimentation in the step seven through the inclined tube are calcium hydroxide, calcium carbonate and calcium sulfate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804419A (en) * | 2022-04-26 | 2022-07-29 | 湖南华菱湘潭钢铁有限公司 | Resource utilization method for reducing hardness of converter flue gas dedusting water by using coke oven desulfurized ash |
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