CN111704344A - Acid pickling process waste zero-emission recycling treatment device and process - Google Patents
Acid pickling process waste zero-emission recycling treatment device and process Download PDFInfo
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- CN111704344A CN111704344A CN202010504645.4A CN202010504645A CN111704344A CN 111704344 A CN111704344 A CN 111704344A CN 202010504645 A CN202010504645 A CN 202010504645A CN 111704344 A CN111704344 A CN 111704344A
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- tail gas
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- rinsing water
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- 239000002253 acid Substances 0.000 title claims abstract description 184
- 238000005554 pickling Methods 0.000 title claims abstract description 85
- 239000002699 waste material Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004064 recycling Methods 0.000 title claims abstract description 24
- 239000010802 sludge Substances 0.000 claims abstract description 102
- 239000007788 liquid Substances 0.000 claims abstract description 66
- 239000008237 rinsing water Substances 0.000 claims abstract description 50
- 239000006096 absorbing agent Substances 0.000 claims abstract description 49
- 238000010521 absorption reaction Methods 0.000 claims abstract description 30
- 230000008929 regeneration Effects 0.000 claims abstract description 13
- 238000011069 regeneration method Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000005406 washing Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 10
- 238000001704 evaporation Methods 0.000 claims description 10
- 230000008020 evaporation Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 229910044991 metal oxide Inorganic materials 0.000 claims description 9
- 150000004706 metal oxides Chemical class 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000001223 reverse osmosis Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 61
- 239000002910 solid waste Substances 0.000 abstract description 10
- 239000002912 waste gas Substances 0.000 abstract description 6
- 230000002378 acidificating effect Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002918 waste heat Substances 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract 1
- 239000013589 supplement Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Images
Classifications
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- 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
-
- 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
- B01D53/14—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 by absorption
- B01D53/1456—Removing acid components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Abstract
The invention relates to a zero-emission recycling treatment device for waste in a pickling process, wherein an acid sludge outlet of a pickling line is sequentially connected with a sludge evaporator, a grinder and a solid-liquid mixer; a waste rinsing water outlet of the pickling line is sequentially connected with a rinsing water concentrator and a solid-liquid mixer; a waste acid outlet of the pickling line and the solid-liquid mixer are both communicated with the roasting reactor; a tail gas outlet of the pickling line and the roasting reactor are both communicated with an acid absorber, and the acid absorber is sequentially connected with a denitration reactor and a sludge evaporator; the disposal process comprises the following steps: the acid sludge discharged by the pickling line is dried and ground, then mixed with concentrated rinsing water obtained by concentrating waste rinsing water discharged by the pickling line, and the concentrated rinsing water and waste acid discharged by the pickling line are jointly fed into a roasting reactor for reaction, and the generated acid regeneration tail gas and tail gas discharged by the pickling line exchange heat with the acid sludge after acid absorption and denitration. The invention realizes the complete resource recovery of the acidic solid waste, the waste liquid and the waste gas generated by the pickling line to realize zero emission, and also utilizes the waste heat to reduce the energy consumption.
Description
Technical Field
The invention relates to the technical field of resource disposal and recycling of pickling waste, in particular to a zero-emission resource disposal device and process for pickling process waste.
Background
In the acid pickling process in the metallurgical industry, a large amount of acid liquor is adopted to carry out acid pickling on plates, rods and wires, and the like, a large amount of acid waste gas and acid pickling waste liquid are generated in the process, and simultaneously, a large amount of acid sludge solid waste consisting of substrate surface iron oxide scales, settled metal acidic compounds and the like is generated. The waste pickle liquor and the acid sludge contain waste acid, heavy metal and the like which are the most important pollutants of metallurgical enterprises and are listed in the list of dangerous waste.
For pickling waste liquid and sludge solid waste, steel enterprises usually adopt lime to neutralize the waste liquid and sludge solid waste to form neutralized sludge precipitates, so that the treatment cost is very high, a larger amount of heavy metal sludge is generated, the environment is greatly influenced, and resources are greatly wasted. Acid mist purification towers are usually arranged for absorbing the acid pickling waste gas, and then lime is used for neutralization after the absorption liquid and other acid pickling waste liquid are gathered.
And partial enterprises filter and press the solid waste of the acid pickling sludge into mud cakes by a filter press, and then intensively convey the mud cakes into a metallurgical smelting system to be used as a treatment means for mixing and adding raw materials, iron ore and the like. However, the acid sludge contains a large amount of acid components, which can cause serious corrosion to smelting equipment, often cause equipment damage and influence production.
Particularly, in the production and preparation process of stainless steel products, nitric acid is often used as a pickling raw material to generate acid waste liquid containing nitric acid and NO with extremely strong corrosivenessxIf the waste gas is not reasonably treated, the environment is seriously polluted. The denitration reactor that sets up for discharge to reach standard needs to use the heat source in order to satisfy the temperature demand of tail gas denitration, and the denitration reaction is exothermic moreover, and the tail gas if direct discharge then causes this part heat direct loss.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a zero-emission recycling treatment device and process for pickling process waste, which can be used for completely recycling acidic solid waste, waste liquid and waste gas generated by a pickling line to realize zero emission.
In order to achieve the aim, the technical scheme of the invention is a pickling process waste zero-emission recycling treatment device, which comprises a pickling line, a sludge evaporator, a grinder, a rinsing water concentrator, a solid-liquid mixer, a roasting reactor, an acid absorber and a denitration reactor; an acid sludge outlet of the acid pickling unit is sequentially connected with the sludge evaporator, the grinder and the solid-liquid mixer through material pipelines; a waste rinsing water outlet of the pickling line is communicated with the rinsing water concentrator, and a concentrated rinsing water outlet of the rinsing water concentrator is communicated with the solid-liquid mixer; the waste acid outlet of the pickling line and the material outlet of the solid-liquid mixer are both communicated with the material inlet of the roasting reactor; and the tail gas outlet of the acid washing unit and the tail gas outlet of the roasting reactor are communicated with the acid absorber, and the tail gas outlet of the acid absorber is sequentially connected with the denitration reactor and the sludge evaporator through a gas transmission pipeline.
Further, a sludge evaporation tail gas outlet of the sludge evaporator is communicated with the acid absorber through a gas transmission pipeline.
Further, a regenerated acid outlet of the acid absorber is communicated with the pickling line.
Further, a regenerated rinse water outlet of the rinse water concentrator is communicated with the pickling line.
Further, a regenerated rinse water outlet of the rinse water concentrator is in communication with the acid absorber.
Further, a heat exchange cooling device is connected in series on the acid absorber.
Further, the rinsing water concentrator is a reverse osmosis membrane device.
The invention also provides a zero-emission recycling treatment process for the pickling process waste by adopting the treatment device, which comprises the following specific steps:
acid sludge discharged by the acid pickling unit is fed into the sludge evaporator, heat exchange is carried out between the acid sludge and high-temperature tail gas discharged by the denitration reactor so as to evaporate the acid sludge, generated dry sludge is fed into the grinder, and the dry sludge is ground into dry sludge powder and then fed into the solid-liquid mixer;
waste rinsing water discharged by the pickling line is fed into the rinsing water concentrator for concentration, the generated concentrated rinsing water is added into the solid-liquid mixer, the concentrated rinsing water and dry sludge powder added into the solid-liquid mixer by the grinder are fully mixed in the solid-liquid mixer, and the formed sludge mixed liquid is conveyed into the roasting reactor;
waste acid discharged by the pickling line is fed into the roasting reactor and jointly generates a high-temperature pyrohydrolysis reaction with sludge mixed liquid fed into the roasting reactor by the solid-liquid mixer to generate acid regeneration tail gas and metal oxide;
recovering and transporting the metal oxide in the roasting reactor; meanwhile, conveying acid regeneration tail gas in the roasting reactor and tail gas of the pickling line discharged by the pickling line into the acid absorber for acid absorption, and absorbing acid components in the tail gas to form regenerated acid; and acid absorption tail gas discharged by the acid absorber is conveyed into a denitration reactor for denitration treatment, and the high-temperature tail gas subjected to denitration treatment is reused in the sludge evaporator for heat exchange with acid sludge and then is discharged.
Further, conveying sludge evaporation tail gas generated by heat exchange in the sludge evaporator into the acid absorber, carrying out acid absorption in the acid absorber together with acid regeneration tail gas and tail gas of the acid washing unit, and recycling regenerated acid generated after absorption for the acid washing unit.
Further, the absorption liquid for absorbing acid in the tail gas in the acid absorber is supplemented by condensate generated by a heat exchange cooling device connected in series on the acid absorber or regenerated rinsing water generated by concentrating waste rinsing water in the rinsing water concentrator.
Compared with the prior art, the invention has the following beneficial effects:
(1) the acid pickling process waste zero-emission recycling treatment device and the process provided by the invention can be used for completely recycling acid solid waste, waste liquid and waste gas generated by the acid pickling unit to realize zero emission;
(2) the invention converts metal ions in the pickling sludge solid waste and the pickling waste liquid into complete resource forms of metal oxides;
(3) the gas temperature in the acid absorber is reduced through the heat exchange cooling device, so that a large amount of moisture in the gas is condensed and enters the absorption liquid to supplement the absorption liquid, the acid absorption can be automatically completed without additional water supplement, and meanwhile, the gas is discharged after reaching the standard;
(4) the acid sludge solid waste is heated and evaporated by using the reaction waste heat of the denitration reactor, so that the energy consumption of the system is reduced;
(5) according to the invention, water and free acid in the acid sludge solid waste are removed by evaporation, so that corrosion to subsequent process equipment such as a grinder can be greatly reduced, then the sludge is ground, and the fully ground dry sludge powder is more beneficial to preparing sludge mixed liquid and is easy to react and regenerate in a roasting reactor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pickling process waste zero-emission recycling treatment device provided by an embodiment of the invention;
in the figure: 1. the system comprises a pickling line, 2, a sludge evaporator, 3, a grinder, 4, a rinsing water concentrator, 5, a solid-liquid mixer, 6, a roasting reactor, 7, an acid absorber, 8, a denitration reactor, 9 and a heat exchange cooling device.
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.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, an embodiment of the present invention provides a zero-emission recycling treatment apparatus for waste from an acid washing process, including an acid washing unit 1, a sludge evaporator 2, a grinder 3, a rinse water concentrator 4, a solid-liquid mixer 5, a roasting reactor 6, an acid absorber 7, and a denitration reactor 8; an acid sludge outlet of the acid pickling unit 1 is sequentially connected with a sludge evaporator 2, a grinder 3 and a solid-liquid mixer 5 through material pipelines and is used for feeding dry sludge powder formed by drying and grinding acid sludge discharged by the acid pickling unit 1 into the solid-liquid mixer 5; the waste rinsing water outlet of the pickling line 1 is communicated with a rinsing water concentrator 4, the concentrated rinsing water outlet of the rinsing water concentrator 4 is communicated with a solid-liquid mixer 5, and the concentrated rinsing water outlet is used for supplying concentrated rinsing water obtained by concentrating waste rinsing water discharged by the pickling line 1 into the solid-liquid mixer 5 and mixing the concentrated rinsing water with dry sludge powder supplied into the solid-liquid mixer 5 by a grinder 3 to form sludge mixed liquid; the waste acid outlet of the pickling line 1 and the material outlet of the solid-liquid mixer 5 are both communicated with the material inlet of the roasting reactor 6, and are used for respectively feeding the sludge mixed liquid discharged by the solid-liquid mixer 5 and the waste acid discharged by the pickling line 1 into the roasting reactor 6 for high-temperature pyrohydrolysis reaction to generate acid regeneration tail gas and metal oxide; the tail gas outlet of the pickling line 1 and the tail gas outlet of the roasting reactor 6 are both communicated with an acid absorber 7 and are used for conveying acid regeneration tail gas generated in the roasting reactor 6 and the pickling line tail gas discharged by the pickling line 1 into the acid absorber 7 for acid absorption to generate regenerated acid; the tail gas outlet of the acid absorber 7 is sequentially connected with the denitration reactor 8 and the sludge evaporator 2 through a gas transmission pipeline, and is used for transmitting acid absorption tail gas after acid absorption in the acid absorber 7 to the denitration reactor 8 for denitration treatment, and using high-temperature tail gas after denitration reaction for heat exchange with acid sludge in the sludge evaporator 2 to evaporate the acid sludge to dryness.
The treatment device can simultaneously and intensively treat the calculation sludge, the waste rinsing water, the waste acid and the tail gas generated by the pickling line, convert metal ions in the acid sludge and the waste rinsing water into a complete resource form of metal oxides, convert the tail gas generated by the high-temperature pyrohydrolysis reaction of the acid sludge, the waste rinsing water and the waste acid and acid components in the tail gas of the pickling line into regenerated acid and recycle the regenerated acid, so as to realize zero emission of waste; meanwhile, because the denitration reaction in the denitration reactor 8 is an exothermic reaction, the acid sludge is heated and evaporated by using the heat released by the denitration reaction, which is beneficial to reducing the energy consumption of the system.
Further, a sludge evaporation tail gas discharge port of the sludge evaporator 2 is communicated with the acid absorber 7 through a gas transmission pipeline. In the embodiment, the sludge evaporation tail gas evaporated from the sludge evaporator 2 is conveyed to the acid absorber 7, and after being sprayed and absorbed, the recyclable effective acidic components in the sludge evaporation tail gas are absorbed by water to form regenerated acid.
Further, a regenerated acid outlet of the acid absorber 7 communicates with the pickling line 1. In the embodiment, the acid regeneration tail gas generated in the roasting reactor 6, the tail gas of the pickling line discharged from the pickling line 1 and the sludge evaporation tail gas evaporated from the sludge evaporator 2 are conveyed to the acid absorber 7 for acid absorption, and the formed regenerated acid can be reused in the pickling line 1.
Further, the rinse water concentrator 4 may be a reverse osmosis membrane device. Furthermore, a regenerated rinsing water outlet of the rinsing water concentrator 4 is communicated with the pickling line 1; and/or the regenerated rinse water outlet of the rinse water concentrator 4 is in communication with the acid absorber 7. The rinse water concentrator of the embodiment adopts a reverse osmosis technology to concentrate the waste rinse water, the generated concentrated solution is sent to the solid-liquid mixer 5, and the generated regenerated rinse water can be reused for the pickling line 1 or for the supplement of the absorption solution in the acid absorber 7, so that the total waste liquid amount can be ensured not to be increased while the regenerated rinse water is recovered.
Further, a heat exchange cooling device 9 is connected in series on the acid absorber 7. This embodiment reduces gas temperature in the sour absorber 7 through heat exchange cooling device 9, makes a large amount of moisture condensation in the gas get into the absorption liquid, supplements the absorption liquid, need not extra moisturizing and can accomplish sour absorption by oneself, simultaneously, is of value to gaseous emission after up to standard.
Further, the sludge evaporator 2 of this embodiment is an indirect heat exchange device, and the high-temperature tail gas discharged from the denitration reactor 8 enters through the heat source gas inlet of the sludge evaporator 2, and is directly discharged from the cold source gas outlet of the sludge evaporator 2 after being subjected to indirect heat exchange with the acid sludge in the sludge evaporator 2.
As shown in fig. 1, the embodiment further provides a zero-emission recycling treatment process for waste in an acid washing process, which includes the following steps:
acid sludge discharged by the acid washing unit 1 is fed into a sludge evaporator 2, heat exchange is carried out between the acid sludge and high-temperature tail gas discharged by a denitration reactor 8 so as to evaporate the acid sludge, generated dry sludge is fed into a grinder 3, and the dry sludge is ground into dry sludge powder and then fed into a solid-liquid mixer 5;
waste rinse water discharged by the pickling line 1 is fed into a rinse water concentrator 4 for concentration, the generated concentrated rinse water is added into a solid-liquid mixer 5, and is fully mixed with dry sludge powder added into the solid-liquid mixer 5 by a grinder 3 in the solid-liquid mixer 5, and the formed sludge mixed liquid is conveyed into a roasting reactor 6; the regenerated rinsing water generated in the rinsing water concentrator 4 is reused in the pickling line 1;
waste acid discharged by the pickling line 1 is fed into the roasting reactor 6 and undergoes a high-temperature pyrohydrolysis reaction together with sludge mixed liquid fed into the roasting reactor 6 by the solid-liquid mixer 5 to generate acid regeneration tail gas and metal oxide;
recovering and transporting the metal oxide in the roasting reactor 6; meanwhile, acid regeneration tail gas in the roasting reactor 6 and tail gas of the pickling line discharged by the pickling line 1 are conveyed into an acid absorber 7 for acid absorption, and acid components in the tail gas are absorbed to form regenerated acid; acid absorption tail gas discharged by the acid absorber 7 is conveyed into the denitration reactor 8 for denitration treatment, high-temperature tail gas subjected to denitration treatment is reused in the sludge evaporator 2 to exchange heat with acid sludge, and system tail gas subjected to heat exchange and temperature reduction is discharged to the atmospheric environment after reaching the standard.
Further, the sludge evaporation tail gas generated by heat exchange in the sludge evaporator 2 is conveyed into the acid absorber 7, and is absorbed in the acid absorber 7 together with the acid regeneration tail gas and the tail gas of the acid washing unit, and the regenerated acid generated after absorption is reused in the acid washing unit 1.
Further, the absorption liquid for absorbing acid in the tail gas in the acid absorber 7 may be supplemented with a condensate produced by a heat exchange cooling device 9 connected in series to the acid absorber 7 or a regenerated rinse water produced by concentrating the waste rinse water in the rinse water concentrator 4. In this embodiment, the absorption liquid is supplemented by the condensate generated by the heat exchange cooling device 9, and when the condensate fails to satisfy the absorption liquid supplementation, the absorption liquid is supplemented by the regenerated rinsing water.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a pickling technology waste zero release resourceful treatment device which characterized in that: comprises an acid washing unit, a sludge evaporator, a grinder, a rinsing water concentrator, a solid-liquid mixer, a roasting reactor, an acid absorber and a denitration reactor; an acid sludge outlet of the acid pickling unit is sequentially connected with the sludge evaporator, the grinder and the solid-liquid mixer through material pipelines; a waste rinsing water outlet of the pickling line is communicated with the rinsing water concentrator, and a concentrated rinsing water outlet of the rinsing water concentrator is communicated with the solid-liquid mixer; the waste acid outlet of the pickling line and the material outlet of the solid-liquid mixer are both communicated with the material inlet of the roasting reactor; and the tail gas outlet of the acid washing unit and the tail gas outlet of the roasting reactor are communicated with the acid absorber, and the tail gas outlet of the acid absorber is sequentially connected with the denitration reactor and the sludge evaporator through a gas transmission pipeline.
2. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: and a sludge evaporation tail gas outlet of the sludge evaporator is communicated with the acid absorber through a gas transmission pipeline.
3. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: and a regenerated acid outlet of the acid absorber is communicated with the pickling line.
4. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: and a regenerated rinsing water outlet of the rinsing water concentrator is communicated with the pickling line.
5. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: the regenerated rinse water outlet of the rinse water concentrator is in communication with the acid absorber.
6. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: and a heat exchange cooling device is connected in series on the acid absorber.
7. The acid pickling process waste zero-emission recycling treatment device of claim 1, characterized in that: the rinsing water concentrator is a reverse osmosis membrane device.
8. The acid washing process waste zero-emission recycling treatment process adopting the treatment device as claimed in any one of claims 1 to 7, is characterized by comprising the following specific steps:
acid sludge discharged by the acid pickling unit is fed into the sludge evaporator, heat exchange is carried out between the acid sludge and high-temperature tail gas discharged by the denitration reactor so as to evaporate the acid sludge, generated dry sludge is fed into the grinder, and the dry sludge is ground into dry sludge powder and then fed into the solid-liquid mixer;
waste rinsing water discharged by the pickling line is fed into the rinsing water concentrator for concentration, the generated concentrated rinsing water is added into the solid-liquid mixer, the concentrated rinsing water and dry sludge powder added into the solid-liquid mixer by the grinder are fully mixed in the solid-liquid mixer, and the formed sludge mixed liquid is conveyed into the roasting reactor;
waste acid discharged by the pickling line is fed into the roasting reactor and jointly generates a high-temperature pyrohydrolysis reaction with sludge mixed liquid fed into the roasting reactor by the solid-liquid mixer to generate acid regeneration tail gas and metal oxide;
recovering and transporting the metal oxide in the roasting reactor; meanwhile, conveying acid regeneration tail gas in the roasting reactor and tail gas of the pickling line discharged by the pickling line into the acid absorber for acid absorption, and absorbing acid components in the tail gas to form regenerated acid; and acid absorption tail gas discharged by the acid absorber is conveyed into a denitration reactor for denitration treatment, and the high-temperature tail gas subjected to denitration treatment is reused in the sludge evaporator for heat exchange with acid sludge and then is discharged.
9. The acid pickling process waste zero-emission recycling treatment process as claimed in claim 8, wherein the acid pickling process waste zero-emission recycling treatment process comprises the following steps: and conveying sludge evaporation tail gas generated by heat exchange in the sludge evaporator into the acid absorber, carrying out acid absorption in the acid absorber together with acid regeneration tail gas and tail gas of the acid washing unit, and reusing regenerated acid generated after absorption in the acid washing unit.
10. The acid pickling process waste zero emission recycling process of claim 8 or 9, wherein: the absorption liquid used for absorbing acid in the tail gas in the acid absorber is supplemented by condensate generated by a heat exchange cooling device connected in series on the acid absorber or regenerated rinsing water generated by concentrating waste rinsing water in the rinsing water concentrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010504645.4A CN111704344A (en) | 2020-06-05 | 2020-06-05 | Acid pickling process waste zero-emission recycling treatment device and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010504645.4A CN111704344A (en) | 2020-06-05 | 2020-06-05 | Acid pickling process waste zero-emission recycling treatment device and process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113774213A (en) * | 2021-08-16 | 2021-12-10 | 中冶南方工程技术有限公司 | Recycling method and system of stainless steel mixed acid pickling sludge |
| CN114574870A (en) * | 2022-02-23 | 2022-06-03 | 宁波渤川废液处置有限公司 | Waste acid treatment automatic control system |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113774213A (en) * | 2021-08-16 | 2021-12-10 | 中冶南方工程技术有限公司 | Recycling method and system of stainless steel mixed acid pickling sludge |
| CN114574870A (en) * | 2022-02-23 | 2022-06-03 | 宁波渤川废液处置有限公司 | Waste acid treatment automatic control system |
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