CN106745960B - Comprehensive utilization method of steelmaking refining fly ash - Google Patents
Comprehensive utilization method of steelmaking refining fly ash Download PDFInfo
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- 238000009628 steelmaking Methods 0.000 title claims abstract description 39
- 239000010881 fly ash Substances 0.000 title claims abstract description 36
- 238000007670 refining Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000002351 wastewater Substances 0.000 claims abstract description 61
- 239000010802 sludge Substances 0.000 claims abstract description 25
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 20
- 238000005097 cold rolling Methods 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 16
- 239000000428 dust Substances 0.000 claims abstract description 16
- 239000011701 zinc Substances 0.000 claims abstract description 16
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 15
- 238000005273 aeration Methods 0.000 claims abstract description 10
- 238000005189 flocculation Methods 0.000 claims abstract description 9
- 230000016615 flocculation Effects 0.000 claims abstract description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000008188 pellet Substances 0.000 claims abstract description 5
- 238000011946 reduction process Methods 0.000 claims abstract description 5
- 230000018044 dehydration Effects 0.000 claims abstract description 4
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 4
- 230000003472 neutralizing effect Effects 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000002378 acidificating effect Effects 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 8
- 238000005352 clarification Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 238000004065 wastewater treatment Methods 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 5
- 239000000920 calcium hydroxide Substances 0.000 claims description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 5
- 239000000701 coagulant Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000000839 emulsion Substances 0.000 claims description 4
- 239000008394 flocculating agent Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000011268 retreatment Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 14
- 229910052742 iron Inorganic materials 0.000 abstract description 10
- 239000002699 waste material Substances 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000004062 sedimentation Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000010979 pH adjustment Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 15
- 239000002245 particle Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- 238000004939 coking Methods 0.000 description 5
- 229920002401 polyacrylamide Polymers 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- 239000000571 coke Substances 0.000 description 4
- 229910001448 ferrous ion Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas 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
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- 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
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/80—Destroying solid waste or transforming solid waste into something useful or harmless involving an extraction step
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B47/00—Obtaining manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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Abstract
The invention relates to a method for comprehensively utilizing steelmaking refining fly ash, which adopts the steelmaking refining fly ash to neutralize and treat cold rolling acid wastewater, utilizes basic substances such as CaO and the like in the refining fly ash to neutralize and treat the cold rolling acid wastewater, leads the wastewater to reach the discharge standard through the processes of aeration, neutralization, PH adjustment, flocculation and sedimentation and the like, simultaneously leads elements such as Fe, Zn and the like in the steelmaking refining fly ash and the rolling acid wastewater to enter precipitated sludge, obtains sludge cakes through dehydration and filter pressing, obtains metallized pellets and zinc-rich dust through the treatment of a high-temperature reduction process, and recovers the valuable elements such as Fe, Zn and the like. The invention can simultaneously treat the steelmaking refining fly ash and the cold rolling acid wastewater, solves the problem of environmental protection, realizes the treatment of waste by waste, can simultaneously recover valuable elements such as Fe, Zn, Mn and the like in the steelmaking refining fly ash and the cold rolling acid wastewater, realizes the recycling of resources, and has very obvious economic benefit and environmental benefit.
Description
Technical Field
The invention belongs to the field of comprehensive utilization of resources, and relates to a comprehensive utilization method of steelmaking refining fly ash.
Background
The refining furnace is a smelting device in the thermal processing industry, and can perform the functions of degassing, adjusting components, adjusting temperature, removing impurities and the like of molten steel in the refining furnace. In addition, in the refining process, part of raw and auxiliary materials are vaporized under the action of high temperature, a series of chemical reactions occur in the vaporization process, and the raw and auxiliary materials enter a pipeline of the dust removal system and then are rapidly cooled and also enter the ash bin of the dust removal system to become part of the steelmaking refining dedusting ash.
Because the steelmaking refining fly ash contains harmful elements such as high content of K, Na, Zn, Cl and the like, and has low total iron content, fine granularity and poor surface hydrophilicity, the cyclic utilization of the steelmaking refining fly ash in the steel industry is greatly limited. Patent CN104310535B discloses a resource utilization method of blast furnace dust and coke oven dust, which comprises the following steps: 1) screening out blast furnace dust and coke oven dust with the particle size of 150-400 meshes; 2) and (3) mixing the screened blast furnace dust and coke oven dust in a mass ratio of 2-5: 1, mixing, adding bentonite and an ammonium salt solution, uniformly stirring, and granulating to obtain particles with the particle size of 1.5-5.0 mm; 3) drying the particles, transferring the dried particles into a muffle furnace, heating the particles to 400-650 ℃ at a heating rate of 12-18 ℃/min in an inert gas atmosphere, roasting the particles for 1-2 h, and sintering the particles to obtain mixed fly ash particles; 4) and (3) putting the mixed dedusting ash particles into the coking biochemical effluent, adjusting the pH value to 3-5, uniformly stirring and mixing, and fully degrading organic matters in the coking biochemical effluent to complete advanced treatment. Not only solves the problems of environmental pollution and land occupation of blast furnace dust removal ash and coke oven dust removal ash, but also realizes the advanced treatment of coking biochemical effluent and reduces the coking wastewater treatment cost. The method for preparing the fly ash particles for treating the coking biochemical wastewater by mixing and granulating the fly ash of the blast furnace and the converter. However, the content does not relate to the process of directly neutralizing the acidic wastewater by the dust removal ash. Patent CN1456517A relates to a method and equipment for purifying and treating industrial acidic wastewater. The treating agent can adopt electric smelting magnesium dedusting ash and light-burned magnesium powder as a neutralizer, and a special design mode and a novel process configuration are adopted, so that the method and the equipment for purifying the acidic wastewater, which have the advantages of investment saving, low operating cost, wide resources, full reaction, good treatment effect, compact structure and convenient management, are provided. The pH value of the treated wastewater can reach 6-9, and the wastewater reaches the discharge standard. Can realize the treatment of wastes with processes of wastes against one another, and protect non-renewable resources. The sludge produced in the treatment process can be sintered to form balls, and can be used as building materials or developed as a water treatment agent, so that the comprehensive utilization of three-waste resources is realized. The treated acidic wastewater can be used for cooling production equipment, greening wet lands and the like. The method and the device for neutralizing the acidic wastewater by adopting the electric smelting magnesium dedusting ash comprise the technical contents of supplying the acidic wastewater to a neutralizing tower; supplying a neutralizing agent in the neutralizing tower, wherein the neutralizing agent adopts fused magnesium dedusting ash and light-burned magnesium powder; carrying out neutralization reaction; and (5) filtering. The content does not relate to the processes of aeration treatment, valuable element recovery and the like.
Disclosure of Invention
The invention aims to provide a method for comprehensively utilizing steelmaking refining fly ash. The invention adopts the steelmaking refining fly ash to neutralize and treat the cold rolling acid wastewater, can simultaneously treat the steelmaking refining fly ash and the cold rolling acid wastewater, realizes the treatment of wastes with processes of wastes against one another, can simultaneously recover valuable elements such as Fe, Zn, Mn and the like in the steelmaking refining fly ash and the cold rolling acid wastewater, and realizes the recycling of resources.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for comprehensively utilizing steelmaking refining fly ash comprises the following process steps:
(1) feeding the steelmaking refined fly ash into a bin of a cold rolling acidic wastewater treatment system, and preparing an emulsion from an alkaline neutralizing agent and storing for later use;
(2) discharging cold rolling acid wastewater into a regulating tank, carrying out aeration treatment to ensure that the wastewater obtains enough dissolved oxygen, oxidizing ferrous ions in the acid wastewater into ferric ions, and simultaneously preventing suspended matters in the tank from sinking to cause the sedimentation in the tank;
(3) continuously aerating the effluent in the step (2) in a primary neutralization tank, adding steelmaking refined fly ash to adjust the pH value of the wastewater to about 7, adding an alkaline neutralizing agent, and further controlling the pH value of the wastewater to be 9-9.5;
(3) the effluent in the step (2) enters a primary neutralization tank through a lift pump, aeration is continued in the primary neutralization tank, and ferrous ions are further oxidized; meanwhile, adding steelmaking refined fly ash to adjust the pH value of the wastewater to about 7, and then adding an alkaline neutralizing agent to further control the pH value of the wastewater to be 9-9.5;
(4) enabling the effluent treated in the step (3) to automatically flow to a secondary neutralization tank, continuously aerating, simultaneously adding an alkaline neutralizing agent to adjust the pH value of the wastewater to 9.5-10.0, adding a flocculating agent PAC, and adjusting the adding amount according to the subsequent sedimentation effect and the effluent quality;
(5) the effluent treated in the step (4) enters a flocculation distribution tank, and a coagulant PAM is added into the flocculation distribution tank to further flocculate and settle suspended matters in the wastewater, wherein the adding amount can be adjusted according to the settling effect of a clarification tank and the effluent quality;
(6) the effluent treated in the step (5) enters a clarification tank, sludge in the wastewater is precipitated and then is sent to a sludge concentration tank by a sludge discharge pump, the water content is reduced by concentration, and then the sludge is sent to a filter press for dehydration to obtain sludge cakes, and metallized pellets and zinc-rich dust are obtained after the sludge is treated by a high-temperature reduction process;
(7) feeding the effluent obtained in the step (6) into a neutralization tank, adding an alkaline neutralizing agent and dilute hydrochloric acid, controlling the pH value of the wastewater to be 6-9, wherein the adding amount of the alkaline neutralizing agent and the dilute hydrochloric acid is determined according to the specific water quality condition;
(8) and (4) enabling the effluent in the step (7) to enter a filtering water tank, if the quality of the treated water cannot reach the standard, performing backflow retreatment on the treated water during discharge, and further removing suspended matters in the treated water through a filter.
Further, in the method for comprehensively utilizing the steelmaking refining fly ash, the TFe content of the steelmaking refining fly ash is more than or equal to 15 percent, the CaO content is more than or equal to 25 percent, the granularity is less than 45 mu m, and the moisture content is less than 1 percent.
Further, in the method for comprehensively utilizing steelmaking refining dedusting ash, the alkaline neutralizer is one or a composition of more of sodium hydroxide, sodium carbonate and calcium hydroxide.
Further, the high-temperature reduction process in the method for comprehensively utilizing the steelmaking refining fly ash is rotary hearth furnace high-temperature reduction or rotary kiln high-temperature reduction.
Compared with the prior art, the invention has at least the following beneficial effects:
the method has the outstanding characteristics that the steelmaking refining fly ash and the cold rolling acid wastewater are treated simultaneously, the problem of environmental protection is solved, the treatment of wastes with processes of wastes against one another is realized, simultaneously, valuable elements such as Fe, Zn, Mn and the like in the steelmaking refining fly ash and the cold rolling acid wastewater can be recovered, the resource recycling is realized, and the method has very obvious economic benefit and environmental benefit.
Drawings
FIG. 1 is a process flow chart of cold rolling acid wastewater treatment by steelmaking refining fly ash.
Detailed Description
The technological process of the present invention is shown in FIG. 1. The present invention will be further described with reference to the following examples.
The chemical components of the steelmaking refining fly ash used in the invention are shown in Table 1, the granularity is less than 45 μm, and the moisture content is less than 1%.
TABLE 1 chemical composition (%) of steelmaking refining fly ash
| Kind of raw material | TFe | CaO | SiO2 | MgO | Al2O3 | Zn | Cl |
| Dust removal ash for steelmaking refining | ≥15 | ≥25 | 3-6 | 3-7 | 1-3 | 2-4 | 0.1-0.5 |
Example 1
The steelmaking refining dedusting ash shown in the table 1 is adopted to treat cold rolling acid wastewater with the pH value of about 2.0-2.5. Feeding the steelmaking refined fly ash into a bin of a cold rolling acidic wastewater treatment system, and preparing an emulsion from an alkaline neutralizing agent and storing for later use; discharging various cold-rolled acidic wastewater into a regulating reservoir, carrying out aeration treatment, enabling the effluent to enter a primary neutralization tank through a lift pump, continuously aerating in the primary neutralization tank, further oxidizing ferrous ions, simultaneously adding steelmaking refining dedusting ash accounting for 0.15-0.20% of the total mass of the wastewater to regulate the pH value of the wastewater to about 7.0, then adding calcium hydroxide accounting for 0.01-0.03% of the total mass of the wastewater, and further controlling the pH value of the wastewater to be 9-9.5;
the effluent flows to a secondary neutralization tank automatically, aeration is continued, meanwhile, a trace amount of calcium hydroxide is added to adjust the pH value of the wastewater to 9.5-10.0, and a PAC flocculating agent with the mass of 2-4 ppm of the total mass of the wastewater is added; the effluent of the secondary neutralization tank enters a flocculation distribution tank, and a coagulant PAM (polyacrylamide) with the mass of 3-5 ppm of the total mass of the wastewater is added into the flocculation distribution tank, so that suspended matters in the wastewater are further flocculated and settled; and (3) allowing effluent to enter a clarification tank, precipitating sludge in the wastewater, pumping the sludge to a sludge concentration tank by using a sludge discharge pump, concentrating, performing filter pressing and dehydration on the precipitate to obtain a sludge cake rich in Fe and Zn, and performing high-temperature reduction at the temperature of 1000-1300 ℃ by using a rotary hearth furnace process to obtain metallized pellets and zinc-rich dust so as to recover valuable elements such as Fe, Zn and the like.
The effluent of the clarification tank enters a neutralization tank, an alkaline neutralizing agent and dilute hydrochloric acid are added, and the pH value of the wastewater is controlled to be 6-9; and (4) the effluent enters a filter tank, the effluent is discharged after the water quality reaches the standard, and if the water quality does not reach the standard, the effluent is refluxed and reprocessed until the effluent is qualified and discharged.
Example 2
The steelmaking refining dedusting ash shown in the table 1 is adopted to treat cold rolling acid wastewater with the pH value of about 1.5-2.0. Feeding the steelmaking refined fly ash into a bin of a cold rolling acidic wastewater treatment system, and preparing an emulsion from an alkaline neutralizing agent and storing for later use; discharging various cold-rolled acidic wastewater into a regulating reservoir, carrying out aeration treatment, enabling the effluent to enter a primary neutralization tank through a lift pump, continuously aerating in the primary neutralization tank, further oxidizing ferrous ions, simultaneously adding steelmaking refining dedusting ash accounting for 0.20-1.0% of the total mass of the wastewater to regulate the pH value of the wastewater to about 7.0, then adding sodium hydroxide accounting for 0.01-0.03% of the total mass of the wastewater, and further controlling the pH value of the wastewater to be 9-9.5;
the effluent flows to a secondary neutralization tank automatically, aeration is continued, meanwhile, a trace amount of calcium hydroxide is added to adjust the pH value of the wastewater to 9.5-10.0, and a PAC flocculating agent with the mass of 2-4 ppm of the total mass of the wastewater is added; the effluent of the secondary neutralization tank enters a flocculation distribution tank, and a coagulant PAM (polyacrylamide) with the mass of 3-5 ppm of the total mass of the wastewater is added into the flocculation distribution tank, so that suspended matters in the wastewater are further flocculated and settled; and (3) allowing effluent to enter a clarification tank, precipitating sludge in the wastewater, pumping the sludge to a sludge concentration tank by a sludge discharge pump, concentrating, filter-pressing and dehydrating the precipitate to obtain sludge cakes rich in Fe and Zn, and performing high-temperature reduction at 1000-1300 ℃ by a rotary kiln process to obtain metallized pellets and zinc-rich dust so as to recover valuable elements such as Fe, Zn and the like.
The effluent of the clarification tank enters a neutralization tank, an alkaline neutralizing agent and dilute hydrochloric acid are added, and the pH value of the wastewater is controlled to be 6-9; and (4) the effluent enters a filter tank, the effluent is discharged after the water quality reaches the standard, and if the water quality does not reach the standard, the effluent is refluxed and reprocessed until the effluent is qualified and discharged.
Although embodiments of the invention have been disclosed above, further modifications may readily occur to those skilled in the art, and the invention is therefore not limited to the specific details, without departing from the general concept defined by the claims and their equivalents.
Claims (1)
1. A method for comprehensively utilizing steelmaking refining fly ash is characterized by comprising the following process steps:
(1) feeding the steelmaking refined fly ash into a bin of a cold rolling acidic wastewater treatment system, and preparing an emulsion from an alkaline neutralizing agent and storing for later use; wherein the TFe content of the steelmaking refining fly ash is more than or equal to 15 percent, the CaO content is more than or equal to 25 percent, the granularity is less than 45 mu m, and the moisture content is less than 1 percent; the alkaline neutralizing agent is sodium hydroxide or calcium hydroxide;
(2) discharging cold rolling acid wastewater into a regulating reservoir for aeration treatment;
(3) continuously aerating the effluent in the step (2) in a primary neutralization tank, adding steelmaking refined fly ash to adjust the pH value of the wastewater to 7, adding an alkaline neutralizing agent, and further controlling the pH value of the wastewater to 9-9.5;
(4) enabling the effluent treated in the step (3) to automatically flow to a secondary neutralization tank, continuing aeration, simultaneously adding an alkaline neutralizing agent to adjust the pH value of the wastewater to 9.5-10.0, and adding a flocculating agent PAC;
(5) enabling the effluent treated in the step (4) to enter a flocculation distribution tank, and adding a coagulant PAM into the flocculation distribution tank;
(6) the effluent treated in the step (5) enters a clarification tank, sludge in the wastewater is precipitated and then is sent to a sludge concentration tank by a sludge discharge pump, the sludge is concentrated to reduce the water content and then is sent to a filter press for dehydration to obtain sludge cakes, and metallized pellets and zinc-rich dust are obtained after the sludge cakes are treated by a high-temperature reduction process, wherein the high-temperature reduction process is rotary hearth furnace high-temperature reduction or rotary kiln high-temperature reduction;
(7) enabling the effluent water obtained in the step (6) to enter a neutralization tank, adding an alkaline neutralizing agent and dilute hydrochloric acid, and controlling the pH value of the wastewater to be 6-9;
(8) and (4) enabling the effluent in the step (7) to enter a filtering water tank, if the quality of the treated water cannot reach the standard, performing backflow retreatment on the treated water during discharge, and further removing suspended matters in the treated water through a filter.
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| CN108726727A (en) * | 2018-06-08 | 2018-11-02 | 江苏省沙钢钢铁研究院有限公司 | The processing method of cold rolling acid waste water and the application for being sintered semi-dry desulphurization ash |
| CN108840430A (en) * | 2018-07-10 | 2018-11-20 | 天津工业大学 | A kind of electro-catalysis blast furnace dedusting ash reinforcing up-flow anaerobic sludge blanket system |
| CN113429030A (en) * | 2021-08-11 | 2021-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for cooperatively treating sintering desulfurization acid wastewater and machine head dedusting ash |
| CN114702188B (en) * | 2021-09-07 | 2023-10-10 | 中冶长天国际工程有限责任公司 | Method and system for cooperatively treating high-salt solid waste ash and acid wastewater of steel plant |
| CN114850174A (en) * | 2022-05-09 | 2022-08-05 | 天俱时工程科技集团有限公司 | Coupling process for solid waste treatment and preparation of chain-looping pellets |
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