WO2018166503A1 - 不锈钢酸洗废水处理*** - Google Patents

不锈钢酸洗废水处理*** Download PDF

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Publication number
WO2018166503A1
WO2018166503A1 PCT/CN2018/079175 CN2018079175W WO2018166503A1 WO 2018166503 A1 WO2018166503 A1 WO 2018166503A1 CN 2018079175 W CN2018079175 W CN 2018079175W WO 2018166503 A1 WO2018166503 A1 WO 2018166503A1
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Prior art keywords
tank
pickling wastewater
treatment system
wastewater treatment
sludge
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PCT/CN2018/079175
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English (en)
French (fr)
Inventor
余章军
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福建欣宇卫浴科技股份有限公司
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Publication of WO2018166503A1 publication Critical patent/WO2018166503A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/20—Halides
    • C01F11/22—Fluorides
    • 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
    • C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
    • 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
    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/583—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing fluoride or fluorine 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F2101/12—Halogens or halogen-containing compounds
    • C02F2101/14—Fluorine or fluorine-containing 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/20—Dewatering by mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/12—Sludge, slurries or mixtures of liquids

Definitions

  • the present disclosure relates to the field of wastewater treatment technology, and in particular to a stainless steel pickling wastewater treatment system.
  • Stainless steel is widely used for its excellent corrosion resistance and good appearance.
  • stainless steel is inevitably subjected to annealing, normalizing, quenching and welding processes, and the surface often produces black scale.
  • the scale not only affects the appearance quality of the stainless steel, but also adversely affects the subsequent processing of the product. Therefore, it must be removed by surface treatment such as pickling or polishing before subsequent processing.
  • Iron oxide scale is formed on the surface of stainless steel, and its main components are FeO, Fe 2 O 3 , NiO, Cr 2 O 3 , Fe 3 O 4 , FeO ⁇ Cr 2 O 3 , Ni ⁇ Fe 2 O 3 and FeO ⁇ Cr 2 O 3 - a dense oxide such as Fe 2 O 3 . These oxides have strong adhesion. In the treatment process of combination process such as shot blasting, high temperature alkali etching, molten salt electrolysis, mixed acid pickling and multi-stage rinsing, it is inevitable to discharge neutral salt wastewater, acid-containing wastewater and A plurality of pickling and rinsing wastewaters such as fluoro mixed acid wastewater.
  • the surface of the scale is generally firstly washed with sulfuric acid to remove the scale, and then pickled with 90-160 g/L of nitric acid and 50-60 g/L of hydrofluoric acid mixed acid.
  • Nitric acid with strong oxidizing properties can oxidize metals and metal oxides to form Cr 3+ , Fe 3+ and Ni 2+ , etc., such metal ions (especially Cr 3+ , Ni 2+ and Fe 3+ , etc.) and nitric acid And hydrofluoric acid forms a stable compound.
  • the above acid and metal ions enter the rinsing water to form pickling wastewater.
  • the neutralization method is simple and easy, but there are problems such as unstable and high fluoride ion concentration in the effluent, large sludge volume, and high treatment cost.
  • the sludge produced by the existing wastewater treatment facilities has a water content of about 50%.
  • the effective components account for about 65%, and the ineffective components of the waste materials. About 35%. If these solid waste materials are recycled into the stainless steel production process, not only waste energy, waste of raw materials, waste of production line capacity, waste of manpower, reduction of production line output rate, but also adverse effects on production processes and product quality.
  • the stainless steel pickling wastewater treatment system provided by the present disclosure better overcomes the problems and defects existing in the prior art described above, and is safe, stable, simple to operate, and convenient to manage the stainless steel pickling wastewater treatment system.
  • the treatment can be carried out at the same time, or can be separately treated according to actual production conditions, thereby not only reducing environmental pollution, but also recycling waste water to solve the problem of recycling of stainless steel pickling wastewater.
  • the realization of the "comprehensive comprehensive management" effect reduces the production cost of the enterprise.
  • a stainless steel pickling wastewater treatment system comprising a mixed acid pickling wastewater treatment system and a sulfuric acid pickling wastewater treatment system;
  • the mixed acid pickling wastewater treatment system comprises a first pH adjusting tank, a first concentrated membrane device, a first collecting tank, a fluorine removing reaction tank and a resin adsorption purification system, which are sequentially connected, and the water clearing mouth of the first concentrated membrane device
  • the first collection tank is connected to the first concentration membrane device
  • the first sludge storage tank is connected to the first sludge storage tank.
  • the first sludge storage tank is connected to the first filter press, and the first filter press is connected.
  • the sludge outlet is connected to the first calcining furnace, the defluoridation reaction tank is connected to the second sludge storage tank, and the second sludge storage tank is connected to the second filter press, the second filter press The sludge outlet is connected to the second calciner;
  • the sulfuric acid pickling wastewater treatment system includes a second pH adjusting tank, a second concentrated membrane device and a second collecting tank connected in series, and the water clearing port of the second concentrated membrane device is in communication with the second collecting tank, the first a third sludge storage tank is connected to the concentrated water outlet of the second concentrated membrane device, a third filter press is connected to the third sludge storage tank, and a third calcination furnace is connected to the sludge outlet of the third filter press;
  • the resin adsorption purification system and the second collection tank are both in communication with the clean water recovery treatment device.
  • the mixed acid pickling wastewater treatment system further includes a plurality of mixed acid pickling wastewater storage tanks, and the plurality of mixed acid pickling wastewater storage tanks are connected to the first pH adjusting tank through a first lifting pump, each of the mixed acid
  • the water outlet of the pickling wastewater storage tank is provided with a first electric control valve
  • the sulfuric acid pickling wastewater treatment system further comprises a plurality of sulfuric acid pickling wastewater storage tanks, and some of the sulfuric acid pickling wastewater storage tanks are all passed through the second lifting pump And communicating with the second pH adjusting tank, the water outlets of each of the sulfuric acid pickling wastewater storage tanks are all provided with a second electric control valve.
  • the water outlet of the first filter press is in communication with the first pH adjustment tank; the water outlet of the third filter press is in communication with the second pH adjustment tank.
  • a first sedimentation tank is disposed at a communication between the first concentration membrane device and the first sludge storage tank; a sludge outlet of the first sedimentation tank is connected to the first sludge storage tank, The water outlet of the first sedimentation tank is in communication with the first collection tank.
  • a second sedimentation tank is disposed at a communication between the second concentration membrane device and the first sludge storage tank; a sludge outlet of the second sedimentation tank is connected to the third sludge storage tank, The water outlet of the second sedimentation tank is in communication with the second collection tank.
  • a third sedimentation tank is disposed at a communication between the fluorine removal reaction tank and the resin adsorption purification system, and a water outlet of the third sedimentation tank is connected to the resin adsorption purification system, and the third sedimentation tank The sludge outlet is in communication with the second sludge storage tank.
  • a membrane separation device is disposed at a communication point between the water outlet of the third sedimentation tank and the resin adsorption purification system.
  • the water outlet of the membrane separation device is in communication with the resin adsorption purification system, and the sludge outlet of the membrane separation device is in communication with the second sludge storage tank.
  • water outlet of the second filter press is also in communication with the first collection pool.
  • the resin adsorption purification system includes a plurality of resin adsorption purification devices.
  • the resin adsorption purification system is in communication with the first collection pool and the second collection pool, respectively.
  • the stainless steel pickling wastewater treatment system of the present disclosure is used for treating stainless steel pickling wastewater, on the one hand, not only greatly reduces the amount of sludge generated and the moisture content of the sludge, but also turns the produced sludge into a calcined treatment.
  • Recyclable materials 100% is the active ingredient, the waste material has zero invalid components, 100% is recycled in the stainless steel production process, which effectively reduces the sludge treatment cost and load, and solves the problem of waste of resources;
  • the resin adsorption purification system is added, and the fluoride ion is further adsorbed by the resin, so that the fluoride concentration in the final effluent is greatly reduced, and the precipitate after the reaction in the fluorine removal reaction tank is recovered by pressure filtration and calcination.
  • High-purity CaF 2 (99% content), which turns waste into treasure, avoids the adverse effects of stainless steel production process caused by inaccurate addition when the subsequent mixing treatment is recovered.
  • the stainless steel pickling wastewater treatment system of the present disclosure separately treats the mixed acid pickling wastewater and the sulfuric acid pickling wastewater, and classifies and stores the production wastewater of different steel types by setting a plurality of pickling wastewater storage tanks. Batch processing, so that the produced sludge is also classified and processed, and the final content of the metal oxide is similar to that of the steel, and can be separately recovered and used as a raw material in the production process for the production process of the corresponding steel. It will not cause any adverse effects on product quality, effectively solve the problem of product quality affected by subsequent sludge recycling and mixing caused by mixed wastewater discharge and mixing treatment; and avoid the additional chemical reaction Ca during mixed discharge and mixing treatment.
  • (OH) 2 + H 2 SO 4 CaSO 4 ⁇ + 2H 2 O, so that the amount of slaked lime added is greatly reduced, the formation of CaSO 4 precipitate is avoided, and the amount of sludge is further reduced.
  • the stainless steel pickling wastewater treatment system of the present disclosure recovers the filtrate through the first filter press to the first pH adjustment tank, and after the second filter press, the filtrate is filtered.
  • the first collection tank is recovered, and the filtrate is recovered by the third filter press, and the filtrate is recovered to the second pH adjustment tank to realize the secondary recovery treatment and utilization of the above filtrate, thereby reducing pollution.
  • Figure 1 is a schematic view showing the structure of a stainless steel pickling wastewater treatment system of the present disclosure.
  • a stainless steel pickling wastewater treatment system will now be described more fully with reference to the associated drawings.
  • a preferred embodiment of a stainless steel pickling wastewater treatment system is given in the drawings.
  • the stainless steel pickling wastewater treatment system can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to make the disclosure of the stainless steel pickling wastewater treatment system more thorough and comprehensive.
  • the present disclosure provides a stainless steel pickling wastewater treatment system comprising a mixed acid pickling wastewater treatment system and a sulfuric acid pickling wastewater treatment system.
  • the mixed acid pickling wastewater treatment system includes a first pH adjusting tank 103, a first concentration membrane device 104, a first collection tank 106, a fluorine removal reaction tank 107, and a resin adsorption purification system 110 that are sequentially connected.
  • the water clearing port of the first concentrated membrane device 104 is in communication with the first collecting tank 106, and the concentrated water outlet of the first concentrated membrane device 104 is further connected to the first sludge storage tank 111.
  • the first sludge storage tank 111 is connected to the first filter press 112, the sludge outlet of the first filter press 112 is connected to the first calcining furnace 113, and the fluorine removal reaction tank 107 is connected to the second
  • the sludge storage tank 114 is connected to the second sludge storage tank 114 via a second filter press 115, and the sludge outlet of the second filter press 115 is connected to the second calcining furnace 116.
  • the sulfuric acid pickling wastewater treatment system includes a second pH adjusting tank 203, a second concentrated membrane unit 204, and a second collecting tank 206 that are sequentially connected.
  • the water clearing port of the second concentrated membrane device 204 is in communication with the second collecting tank 206, and the concentrated water outlet of the second concentrated membrane device 204 is connected to a third sludge storage tank 207, and the third sludge storage tank 207
  • a third filter press 208 is connected, and the sludge outlet of the third filter press 208 is connected to a third calciner 209.
  • the resin adsorption purification system 110 and the second collection tank 206 are both in communication with the clean water recovery treatment device 300.
  • the present disclosure provides a stainless steel pickling wastewater treatment system which is integrated, modular, fully automatic operation of the whole system, safe and stable in operation, simple in operation and convenient in management, and is washed by mixed acid pickling wastewater and sulfuric acid.
  • the wastewater can be treated separately, and can be treated at the same time. It can also be treated separately according to the actual production situation, which not only reduces environmental pollution, but also recycles wastewater, solves the problem of recycling of stainless steel pickling wastewater, and achieves the effect of “comprehensive comprehensive treatment” and reduces The production cost of the enterprise.
  • the first concentrated membrane device 104 and the second concentrated membrane device 204 can be exemplified by a high pressure reverse osmosis roll membrane or a high pressure reverse osmosis disc membrane or a vibrating membrane or a forward osmosis membrane.
  • the first concentration membrane device 104 and the second concentration membrane device 204 may also be exemplified by a nanofiltration membrane, an ultrafiltration membrane, a microfiltration membrane, or a general filter cartridge.
  • the hydroxide precipitated particles in the concentrated water are further concentrated and aggregated to increase and form a clear and turbid separation.
  • the fluorine removal reaction tank 107 reacts with fluoride ions in the pickling wastewater by adding slaked lime to form a CaF 2 precipitate.
  • the mixed acid pickling wastewater treatment system further includes a plurality of mixed acid pickling wastewater storage tanks 101, and the plurality of mixed acid pickling wastewater storage tanks 101 are all connected to the first pH adjusting tank 103 through a first lift pump 102.
  • the water outlet of each of the mixed acid pickling wastewater storage tanks 101 is provided with a first electric control valve 1011;
  • the sulfuric acid pickling wastewater treatment system further includes a plurality of sulfuric acid pickling wastewater storage tanks 201, and the plurality of sulfuric acid pickling wastewater storage tanks
  • the pool 201 is connected to the second pH adjusting tank 203 through a second lift pump 202.
  • the water outlets of each of the sulfuric acid pickling wastewater storage tanks 201 are provided with a second electronically controlled valve 2011.
  • the term "several” is understood to mean two, three, four or six, etc.; several mixed acid pickling wastewater reservoirs 101 or several sulfuric acid pickling wastewater reservoirs 201 may be arranged in a side-by-side manner.
  • the stainless steel produced in the enterprise is divided into 200 series, 300 series and 400 series steel.
  • the wastewater produced by the three different steel types is divided into A200 sulfuric acid pickling wastewater, A300 sulfuric acid pickling wastewater, A400 sulfuric acid pickling wastewater, B200 mixed acid.
  • Pickling wastewater, B300 mixed acid pickling wastewater and B400 mixed acid pickling wastewater is divided into A200 sulfuric acid pickling wastewater, A300 sulfuric acid pickling wastewater, A400 sulfuric acid pickling wastewater, B200 mixed acid.
  • the acid washing wastewater of different steel types is classified and stored, namely, B200 mixed acid pickling wastewater storage tank, B300 mixed acid pickling wastewater storage tank and B400 mixed acid pickling wastewater storage tank and A200 sulfuric acid pickling.
  • the disclosure classifies and stores the pickling wastewaters of different steel types, and controls the batch control by setting the electric control valve of the water outlet of each pickling wastewater storage tank, so that the sludges which are subsequently produced are also classified and calcined, and finally obtained.
  • the content of the metal oxide is similar to that of the steel, and can be separately recovered.
  • the water outlet of the first filter press 112 is in communication with the first pH adjusting tank 103; the water outlet of the third filter press 208 is adjusted with the second pH. Pool 203 is connected.
  • the first concentration membrane device 104 is provided with a first sedimentation tank 105 in communication with the first sludge storage tank 111; the sludge outlet of the first sedimentation tank 105 is The first sludge storage tank 111 is in communication, and the water outlet of the first sedimentation tank 105 is in communication with the first collection tank 106.
  • the second sedimentation tank 205 is disposed at a communication between the second concentration membrane device 204 and the third sludge reservoir 207; the sludge outlet of the second sedimentation tank 205
  • the third sludge storage tank 207 is in communication with the third sludge storage tank 207, and the water outlet of the second sedimentation tank 205 is in communication with the second collection tank 206.
  • a third sedimentation tank 108 is disposed at a communication between the fluorine removal reaction tank 107 and the resin adsorption purification system 110, and the water outlet of the third sedimentation tank 108 and the resin
  • the adsorption purification system 110 is in communication, and the sludge outlet of the third precipitation tank 108 is in communication with the second sludge storage tank 114.
  • a membrane separation device 109 is disposed at a communication between the third precipitation tank 108 and the resin adsorption purification system 110, and the water outlet of the membrane separation device 109 is adsorbed and purified by the resin.
  • the system 110 is in communication, and the sludge outlet of the membrane separation unit 109 is in communication with the second sludge storage tank 114.
  • the membrane separation device 109 can be exemplified by a reverse osmosis membrane, a microfiltration membrane or an ultrafiltration membrane. Due to the small pore size of the membrane, fine particles and other pollutants in the waste liquid can be trapped, and further solid-liquid separation and wastewater can be carried out. Purification. The solid matter obtained by the membrane separation is transported from the sludge outlet of the membrane separation device 109 to the second sludge storage tank 114, and the clean water after the membrane separation is directly discharged from the outlet of the membrane separation device 109 to the next process. Thereby achieving the purpose of solid-liquid separation and wastewater purification.
  • the water outlet of the second filter press 115 is also in communication with the first collection pool 106.
  • the resin adsorption purification system 110 includes a plurality of resin adsorption purification devices.
  • the resin adsorption purification system 110 utilizes a fluorine-removing resin (such as a strong basic anion resin, a chelating resin) to have an efficient selective adsorption performance for fluorine ions, and exchanges F- in water with OH- on the resin, F -Adsorbed by resin, OH- is exchanged into water, through exchange to achieve further reduction of effluent F-concentration, to meet higher and more stringent pickling wastewater recovery standards.
  • a fluorine-removing resin such as a strong basic anion resin, a chelating resin
  • the resin adsorption purification system 110 is in communication with the first collection pool 106 and the second collection pool 206, respectively.
  • the process flow of the stainless steel pickling wastewater treatment system is:
  • the pickling wastewater in the mixed acid pickling wastewater storage tank 101 is pumped into the first pH adjusting tank 103 through the first lift pump 102, and the pH of the mixed acid pickling wastewater is adjusted to 10.5 by adding an alkali solution (such as sodium hydroxide).
  • an alkali solution such as sodium hydroxide
  • the supernatant liquid in 105 is discharged into the first collection tank 106, and the lower hydroxide sediment is discharged into the first sludge storage tank 111, and the amount of sludge in the first sludge storage tank 111 reaches a certain amount.
  • the sludge pump (not shown) is pumped to the first filter press 112, and the generated mud cake is sent to the first calcining furnace 113 for high-temperature calcination to obtain a metal oxide, and the filtrate is recovered to the first pH.
  • the conditioning tank 103 continues the secondary process.
  • the waste liquid in the first collection tank 106 is continuously upgraded to the fluorine removal reaction tank 107, and after adjusting the pH to about 8.0, the hydrated lime Ca(OH) 2 is added to react with the fluoride ions in the wastewater to form a CaF 2 precipitate, and then the third
  • the sedimentation tank 108 performs solid-liquid separation, and the sediment in the sedimentation tank enters the second sludge storage tank 114, and is pumped to the second filter press 115 through a sludge pump (not shown), and the generated mud cake is automatically sent.
  • the second calcining furnace 116 is directly subjected to high-temperature calcination or intermittently calcined to obtain high-purity CaF 2 powder, and the filtrate is recovered into the first collection tank 106 for secondary treatment; the supernatant in the sedimentation tank is separated by membrane. Device 109 is again solid-liquid separated. The filtrate separated by the membrane separation device 109 is discharged into the second sludge storage tank 114, and the filtrate enters the resin adsorption purification system 110 for ion adsorption exchange, and the purified water discharged through the resin adsorption purification system 110 is discharged into the second collection pool. 206. The simultaneously generated resin regeneration wastewater is recovered to the first collection tank 106 to continue the secondary treatment.
  • the pickling wastewater in the sulfuric acid pickling wastewater storage tank 201 is drawn into the second pH adjusting tank 203 through the second lift pump 202, and the pH of the mixed acid pickling wastewater is adjusted to 10.5 by adding an alkali solution (such as sodium hydroxide).
  • an alkali solution such as sodium hydroxide
  • the sediment is discharged into the third sludge storage tank 207, and the amount of sludge in the third sludge storage tank 207 reaches a certain amount, and is pumped to the third filter press 208 by a sludge pump (not shown).
  • the generated mud cake is automatically sent into the third calcining furnace 209 to be directly subjected to high-temperature calcination or intermittently subjected to calcination treatment to obtain a metal oxide, and the filtrate is recovered to the second pH adjusting tank 203 for secondary treatment.
  • the clean water collected in the second collection tank 206 is discharged into the clean water recovery processing device 300.
  • the beneficial effects of the stainless steel pickling wastewater treatment system of the present disclosure are:
  • the stainless steel pickling wastewater treatment system of the present disclosure is used for treating stainless steel pickling wastewater, on the one hand, not only greatly reduces the amount of sludge generated and the moisture content of the sludge, but also turns the produced sludge into a calcined treatment.
  • Recyclable materials 100% is the active ingredient, the waste material has zero invalid components, 100% is recycled in the stainless steel production process, which effectively reduces the sludge treatment cost and load, and solves the problem of waste of resources;
  • the resin adsorption purification system is added, and the fluoride ion is further adsorbed by the resin, so that the fluoride concentration in the final effluent is greatly reduced, and the precipitate after the reaction in the fluorine removal reaction tank is recovered by pressure filtration and calcination.
  • High-purity CaF 2 (99% content), which turns waste into treasure, avoids the adverse effects of stainless steel production process caused by inaccurate addition when the subsequent mixing treatment is recovered.
  • the stainless steel pickling wastewater treatment system of the present disclosure separately treats the mixed acid pickling wastewater and the sulfuric acid pickling wastewater, and classifies and stores the production wastewater of different steel types by setting a plurality of pickling wastewater storage tanks. Batch processing, so that the produced sludge is also classified and processed, and the final content of the metal oxide is similar to that of the steel, and can be separately recovered and used as a raw material in the production process for the production process of the corresponding steel. It will not cause any adverse effects on product quality, effectively solve the problem of product quality affected by subsequent sludge recycling and mixing caused by mixed wastewater discharge and mixing treatment; and avoid the additional chemical reaction Ca during mixed discharge and mixing treatment.
  • (OH) 2 + H 2 SO 4 CaSO 4 ⁇ + 2H 2 O, so the addition amount of hydrated lime Ca(OH) 2 is greatly reduced, the formation of CaSO 4 precipitate is avoided, and the amount of sludge is further reduced.
  • the stainless steel pickling wastewater treatment system of the present disclosure recovers the filtrate through the first filter press to the first pH adjustment tank, and after the second filter press, the filtrate is filtered.
  • the first collection tank is recovered, and the filtrate is recovered by the third filter press, and the filtrate is recovered to the second pH adjustment tank to realize the secondary recovery treatment and utilization of the above filtrate, thereby reducing pollution.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Removal Of Specific Substances (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

一种不锈钢酸洗废水处理***，包括混酸酸洗废水处理***和硫酸酸洗废水处理***；其中混酸酸洗废水处理***包括依次连通的第一pH调节池（103）、第一浓缩膜装置（104）、第一收集池（106）、除氟反应池（107）和树脂吸附净化***（110）；硫酸酸洗废水处理***包括依次连通的第二pH调节池（203）、第二浓缩膜装置（204）和第二收集池（206）。该不锈钢酸洗废水处理***通过将混酸酸洗废水和硫酸酸洗废水分开处理，可同时进行处理，也可以根据实际生产情况单独进行处理，不仅降低了环境污染，而且使废水资源化，解决不锈钢酸洗废水循环利用问题，降低了企业的生产成本。

Description

不锈钢酸洗废水处理***
相关申请的交叉引用
本申请要求于2017年03月15日提交中国专利局的申请号为201710152089.7、名称为“不锈钢酸洗废水处理***”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及废水处理技术领域，具体而言，涉及一种不锈钢酸洗废水处理***。
背景技术
不锈钢因其优良的耐腐蚀性和良好的外观而被广泛应用。不锈钢在生产过程中，不可避免地要经过退火、正火、淬火和焊接等加工过程，表面时常会产生黑色的氧化皮。氧化皮不仅影响不锈钢的外观质量，也会对产品的后续加工产生不利影响，故在后续加工前必须采用酸洗、抛光等表面处理方法将其除去。
不锈钢表面会产生氧化铁皮，其主要成分是FeO、Fe 2O 3、NiO、Cr 2O 3、Fe 3O 4、FeO·Cr 2O 3、Ni·Fe 2O 3和FeO·Cr 2O 3·Fe 2O 3等致密型氧化物。这些氧化物基本附着力强，在采用抛丸、高温碱蚀、熔盐电解、混酸酸洗和多级漂洗等组合工艺的处理工艺中，不可避免会排放中性盐废水、含酸废水和含氟混酸废水等多股酸洗漂洗废水。
不锈钢酸洗过程中，一般首先是用硫酸预酸洗除去表面的氧化铁皮，然后用90～160g/L硝酸和50～60g/L氢氟酸混酸进行酸洗。具有强氧化性的硝酸可以将金属和金属氧化物氧化，生成Cr 3+、Fe 3+和Ni 2+等，这些金属离子(尤其是Cr 3+、Ni 2+和Fe 3+等)和硝酸及氢氟酸形成稳定的化合物。在多级漂洗过程中，上述酸液及金属离子进入到漂洗水中，形成酸洗废水。
对于此类酸洗废水的处理，目前最常用的就是石灰中和单步沉淀法。中和法简便易行，但是存在出水氟离子浓度不稳定且偏高，污泥量大、处理成本高等问题。
在一般情况下，通过现有废水处理设施产生的污泥，含水率为50％左右，除去水份后剩下的50％的固体物料中，有效成份占65％左右，废固物料无效成份占35％左右。如果这些固废物料被回收利用到不锈钢生产制程中，不仅会浪费能源，浪费原材料，浪费生产线产能，浪费人力，减少生产线产出率，而且会对生产制程和产品品质造成不良影响。
发明内容
有鉴于此，本公开提供的一种不锈钢酸洗废水处理***，更好地克服了上述现有技术存在的问题和缺陷，运行安全、稳定，操作简单、管理方便的不锈钢酸洗废水处理***，通过将混酸酸洗废水和硫酸酸洗废水分开处理，可同时进行处理，也可以根据实际生产情 况单独进行处理，不仅降低了环境污染，而且使废水资源化，解决不锈钢酸洗废水循环利用问题，实现“全面综合治理”的效果，降低了企业的生产成本。
一种不锈钢酸洗废水处理***，包括混酸酸洗废水处理***和硫酸酸洗废水处理***；
所述混酸酸洗废水处理***包括依次连通的第一pH调节池、第一浓缩膜装置、第一收集池、除氟反应池和树脂吸附净化***，所述第一浓缩膜装置的清水口与所述第一收集池连通，所述第一浓缩膜装置的浓水口还连通有第一污泥贮池，所述第一污泥贮池连通有第一压滤机，所述第一压滤机的污泥出口连通有第一煅烧炉，所述除氟反应池还连通有第二污泥贮池，所述第二污泥贮池连通有第二压滤机，所述第二压滤机的污泥出口连通有第二煅烧炉；
所述硫酸酸洗废水处理***包括依次连通的第二pH调节池、第二浓缩膜装置和第二收集池，所述第二浓缩膜装置的清水口与所述第二收集池连通，所述第二浓缩膜装置的浓水口连通有第三污泥贮池，所述第三污泥贮池连通有第三压滤机，所述第三压滤机的污泥出口连通有第三煅烧炉；
所述树脂吸附净化***和所述第二收集池均与清水回收处理装置连通。
进一步地，所述混酸酸洗废水处理***还包括若干混酸酸洗废水储池，若干所述混酸酸洗废水储池均通过第一提升泵与所述第一pH调节池连通，各个所述混酸酸洗废水储池的出水口均设置有第一电控阀；所述硫酸酸洗废水处理***还包括若干硫酸酸洗废水储池，若干所述硫酸酸洗废水储池均通过第二提升泵与所述第二pH调节池连通，各个所述硫酸酸洗废水储池的出水口均设置有第二电控阀。
进一步地，所述第一压滤机的出水口与所述第一pH调节池连通；所述第三压滤机的出水口与所述第二pH调节池连通。
进一步地，所述第一浓缩膜装置与所述第一污泥贮池的连通处设置有第一沉淀池；所述第一沉淀池的污泥出口与所述第一污泥贮池连通，所述第一沉淀池的出水口与所述第一收集池连通。
进一步地，所述第二浓缩膜装置与所述第一污泥贮池的连通处设置有第二沉淀池；所述第二沉淀池的污泥出口与所述第三污泥贮池连通，所述第二沉淀池的出水口与所述第二收集池连通。
进一步地，所述除氟反应池与所述树脂吸附净化***的连通处设置有第三沉淀池，所述第三沉淀池的出水口与所述树脂吸附净化***连通，所述第三沉淀池的污泥出口与所述第二污泥贮池连通。
进一步地，所述第三沉淀池的出水口与所述树脂吸附净化***的连通处设置有膜分离 装置。所述膜分离装置的出水口与所述树脂吸附净化***连通，所述膜分离装置的污泥出口与所述第二污泥贮池连通。
进一步地，所述第二压滤机的出水口还与所述第一收集池连通。
进一步地，所述树脂吸附净化***包括若干树脂吸附净化装置。
进一步地，所述树脂吸附净化***分别与所述第一收集池和所述第二收集池连通。
与现有技术相比，本公开的不锈钢酸洗废水处理***的有益效果是：
(1)本公开的不锈钢酸洗废水处理***用于处理不锈钢酸洗废水过程中，一方面不仅大大减少了污泥产生量和污泥含水率，而且将产生的污泥经煅烧处理后变成可回收物料，100％为有效成份，废物料无效成份为零，100％回收用于不锈钢生产制程中，有效降低了污泥处理成本和负荷，以及解决了资源浪费的问题；另一方面通过在除氟反应池加熟石灰除氟后增加树脂吸附净化***，进一步通过树脂吸附氟离子，使最终出水氟离子浓度大大降低，另外将除氟反应池反应后的沉淀物回收经压滤、煅烧处理获得高纯度CaF 2(99％含量)，从而变废为宝，避免了后续混合处理回收时，因添加量不准确而造成对不锈钢生产制程产生不良影响。
(2)进一步地，本公开的不锈钢酸洗废水处理***将混酸酸洗废水和硫酸酸洗废水分开处理，并通过设置若干酸洗废水储池，将不同钢种的生产废水进行分类存储及分批处理，使产出的污泥也分类处理，最终得到的金属氧化物中其成份含量与钢种成份相近，可以分别回收，作为生产制程中的原材料利用于相应钢种的生产过程中，而不会对产品质量造成任何不良影响，有效解决了因混合废水排放、混合处理造成的后续污泥回收利用影响产品质量问题；同时也避免了因混合排放、混合处理过程中额外发生的化学反应Ca(OH) 2+H 2SO 4＝CaSO 4↓+2H 2O，因此大量减少了熟石灰的添加量，避免了CaSO 4沉淀的生成，进一步减少了污泥量的产生。
(3)进一步地，本公开的不锈钢酸洗废水处理***通过将经第一压滤机压滤后的滤过液回收到第一pH调节池，经第二压滤机压滤后滤过液回收到第一收集池，经第三压滤机压滤后滤过液回收到第二pH调节池，实现上述滤过液的二次回收处理和利用，减少污染。
为使本公开的上述目的、特征和优点能更明显易懂，下文特举较佳实施例，并配合所附附图，作详细说明如下。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例中所需要使用的附图作简单的介绍，应当理解，以下附图仅示出了本公开的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这 些附图获得其他相关的附图。
图1为本公开的不锈钢酸洗废水处理***的结构示意图。
附图标号说明：
101                      混酸酸洗废水储池
1011                     第一电控阀
102                      第一提升泵
103                      第一pH调节池
104                      第一浓缩膜装置
105                      第一沉淀池
106                      第一收集池
107                      除氟反应池
108                      第三沉淀池
109                      膜分离装置
110                      树脂吸附净化***
111                      第一污泥贮池
112                      第一压滤机
113                      第一煅烧炉
114                      第二污泥贮池
115                      第二压滤机
116                      第二煅烧炉
201                      硫酸酸洗废水储池
2011                     第二电控阀
202                      第二提升泵
203                      第二pH调节池
204                      第二浓缩膜装置
205                      第二沉淀池
206                      第二收集池
207                      第三污泥贮池
208                      第三压滤机
209                      第三煅烧炉
300                      清水回收处理装置
具体实施方式
为了便于理解本公开，下面将参照相关附图对不锈钢酸洗废水处理***进行更全面的描述。附图中给出了不锈钢酸洗废水处理***的首选实施例。但是，不锈钢酸洗废水处理***可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对不锈钢酸洗废水处理***的公开内容更加透彻全面。
在本公开的描述中，需要理解的是，术语“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，术语“第一”、“第二”、“第三”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
在本公开的描述中，除非另有规定和限定，需要说明的是，术语“安装”、“相连”、“连通”应做广义理解，例如，可以是机械连通或电连通，也可以是两个元件内部的连通，可以是直接相连，也可以通过中间媒介间接相连，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语的具体含义。
参阅图1，本公开提供了一种不锈钢酸洗废水处理***，包括混酸酸洗废水处理***和硫酸酸洗废水处理***。
所述混酸酸洗废水处理***包括依次连通的第一pH调节池103、第一浓缩膜装置104、第一收集池106、除氟反应池107和树脂吸附净化***110。所述第一浓缩膜装置104的清水口与所述第一收集池106连通，所述第一浓缩膜装置104的浓水口还连通有第一污泥贮池111。所述第一污泥贮池111连通有第一压滤机112，所述第一压滤机112的污泥出口连通有第一煅烧炉113，所述除氟反应池107还连通有第二污泥贮池114，所述第二污泥贮池114连通有第二压滤机115，所述第二压滤机115的污泥出口连通有第二煅烧炉116。
所述硫酸酸洗废水处理***包括依次连通的第二pH调节池203、第二浓缩膜装置204和第二收集池206。所述第二浓缩膜装置204的清水口与所述第二收集池206连通，所述第二浓缩膜装置204的浓水口连通有第三污泥贮池207，所述第三污泥贮池207连通有第三压滤机208，所述第三压滤机208的污泥出口连通有第三煅烧炉209。
所述树脂吸附净化***110和所述第二收集池206均与清水回收处理装置300连通。
由上述描述可知，本公开提供一种一体化、模块化，整套***全自动运行，运行安全、稳定，操作简单、管理方便的不锈钢酸洗废水处理***，通过将混酸酸洗废水和硫酸酸洗废水分开处理，可同时进行处理，也可以根据实际生产情况单独进行处理，不仅降低了环境污染，而且使废水资源化，解决不锈钢酸洗废水循环利用问题，实现“全面综合治理”的效果，降低了企业的生产成本。
所述第一浓缩膜装置104和所述第二浓缩膜装置204均可列举为高压反渗透卷式膜或高压反渗透盘式膜或振动膜或正渗透膜。所述第一浓缩膜装置104和所述第二浓缩膜装置204还均可列举为纳滤膜、超滤膜、微滤膜或一般的过滤芯等。在浓缩膜装置中，通过膜分离，浓水中的氢氧化物沉淀颗粒进一步浓缩聚集增粗增大，形成清浊分离。
所述除氟反应池107中通过添加熟石灰与酸洗废水中的氟离子反应生成CaF 2沉淀。
进一步地，所述混酸酸洗废水处理***还包括若干混酸酸洗废水储池101，若干所述混酸酸洗废水储池101均通过第一提升泵102与所述第一pH调节池103连通，各个所述混酸酸洗废水储池101的出水口均设置有第一电控阀1011；所述硫酸酸洗废水处理***还包括若干硫酸酸洗废水储池201，若干所述硫酸酸洗废水储池201均通过第二提升泵202与所述第二pH调节池203连通，各个所述硫酸酸洗废水储池201的出水口均设置有第二电控阀2011。
术语“若干”可理解为两个、三个、四个或者六个等；若干混酸酸洗废水储池101或若干硫酸酸洗废水储池201均可设置为并列排放方式。例如企业生产中的不锈钢分为200系、300系和400系钢种，该三种不同钢种产生的废水分为A200硫酸酸洗废水、A300硫酸酸洗废水、A400硫酸酸洗废水、B200混酸酸洗废水、B300混酸酸洗废水和B400混酸酸洗废水。因此在酸水废水处理前，将不同钢种的酸洗废水进行分类存储，即包括B200混酸酸洗废水储池、B300混酸酸洗废水储池和B400混酸酸洗废水储池以及A200硫酸酸洗废水储池、A300硫酸酸洗废水储池和A400硫酸酸洗废水储池。本公开通过将不同钢种的酸洗废水进行分类存储，并通过各酸洗废水储池的出水口设置电控阀控制进行分批处理，使后续产出的污泥也分类煅烧处理，最终得到的金属氧化物中其成份含量与钢种成份相近，可以分别回收，作为生产制程中的原材料利用于相应钢种的生产过程中，而不会对产品质量造成任何不良影响，有效解决了因混合废水排放、混合处理造成的后续污泥回收利用影响产品质量问题；同时也避免了因混合排放、混合处理过程中额外发生的化学反应Ca(OH) 2+H 2SO 4＝CaSO 4↓+2H 2O，因此大量减少了熟石灰Ca(OH) 2的添加量，避免了CaSO 4沉淀的生成，进一步减少了污泥量的产生。
优选地，在本公开实施例中，所述第一压滤机112的出水口与所述第一pH调节池103连通；所述第三压滤机208的出水口与所述第二pH调节池203连通。
优选地，在本公开实施例中，所述第一浓缩膜装置104与所述第一污泥贮池111连通处设置有第一沉淀池105；所述第一沉淀池105的污泥出口与所述第一污泥贮池111连通，所述第一沉淀池105的出水口与所述第一收集池106连通。
优选地，在本公开实施例中，所述第二浓缩膜装置204与所述第三污泥贮池207的连通处设置有第二沉淀池205；所述第二沉淀池205的污泥出口与所述第三污泥贮池207连通，所述第二沉淀池205的出水口与所述第二收集池206连通。
优选地，在本公开实施例中，所述除氟反应池107与所述树脂吸附净化***110的连通处设置有第三沉淀池108，所述第三沉淀池108的出水口与所述树脂吸附净化***110连通，所述第三沉淀池108的污泥出口与所述第二污泥贮池114连通。
优选地，在本公开实施例中，所述第三沉淀池108与所述树脂吸附净化***110的连通处设置有膜分离装置109，所述膜分离装置109的出水口与所述树脂吸附净化***110连通，所述膜分离装置109的污泥出口与所述第二污泥贮池114连通。
所述膜分离装置109可列举为反渗透膜、微滤膜或超滤膜等，由于膜的孔径很小，可以截留废液中的细小微粒和其它污染物等，进一步进行固液分离和废水净化。膜分离得到的固体物质从膜分离装置109污泥出口输送到第二污泥贮池114，膜分离后的清水则从膜分离装置109出水口直接排到下一步工艺处理。从而达到固液分离和废水净化的目的。
优选地，在本公开实施例中，所述第二压滤机115的出水口还与所述第一收集池106连通。
优选地，在本公开实施例中，所述树脂吸附净化***110包括若干树脂吸附净化装置。
所述树脂吸附净化***110利用除氟树脂(如强碱性阴离子树脂、螯合树脂)对氟离子具有高效的专一选择吸附性能，使水中的F-与树脂上的OH-发生交换，F-被树脂吸附，OH-经被交换到水中，通过交换作用以达到进一步降低出水F-浓度的目的，满足更高更严格的酸洗废水回收标准。
优选地，在本公开实施例中，所述树脂吸附净化***110分别与所述第一收集池106和所述第二收集池206连通。
如图1所示，不锈钢酸洗废水处理***的工艺流程是：
将混酸酸洗废水储池101内酸洗废水通过第一提升泵102抽入第一pH调节池103内，通过加入碱液(如氢氧化钠等)将混酸酸洗废水的pH值调节至10.5～11，同时与废水中的重金属离子(Cr 3+、Fe 3+和Ni 2+等)反应形成氢氧化物沉淀；调整pH后的酸洗废水经过第一浓缩膜装置104，使氢氧化物沉淀颗粒浓缩聚集增粗增大，并形成清浊分离，得到的上清液直接排入第一收集池106，浓水则进入第一沉淀池105内进行沉淀达到固液分离，第一沉淀池105中的上清液排入第一收集池106，下部的氢氧化物沉降物排入第一污泥贮池 111中，待第一污泥贮池111中的污泥量达到一定量，经污泥泵(图中未示出)抽到第一压滤机112压滤，产生的泥饼送入第一煅烧炉113内进行高温煅烧，得到金属氧化物，滤过液回收到第一pH调节池103继续二次处理。第一收集池106内的废液继续提升至除氟反应池107中，调节pH至8.0左右后，加入熟石灰Ca(OH) 2，与废水中的氟离子反应生成CaF 2沉淀，接着经第三沉淀池108进行固液分离，沉淀池内的沉淀物进入第二污泥贮池114，经污泥泵(图中未示出)抽到第二压滤机115压滤，产生的泥饼自动送入第二煅烧炉116直接进行高温煅烧或者放置后间歇进行煅烧处理，得到高纯度的CaF 2粉末，滤过液回收到第一收集池106继续二次处理；沉淀池内的上清液经膜分离装置109再次固液分离。经膜分离装置109分离出来的过滤物排入第二污泥贮池114，而过滤液则进入树脂吸附净化***110进行离子吸附交换，经树脂吸附净化***110的净化水排入第二收集池206，同时产生的树脂再生废水回收到第一收集池106继续二次处理。
将硫酸酸洗废水储池201内酸洗废水通过第二提升泵202抽入第二pH调节池203内，通过加入碱液(如氢氧化钠等)将混酸酸洗废水的pH值调节至10.5～11，同时与废水中的重金属离子(Cr 3+、Fe 3+和Ni 2+等)反应形成氢氧化物沉淀；调整pH后的酸洗废水经过第二浓缩膜装置204处理后，上清液直接排入第二收集池206，浓水则进入第二沉淀池205内进行沉淀达到固液分离，第二沉淀池205中的上清液排入第二收集池206，下部的氢氧化物沉降物排入第三污泥贮池207中，待第三污泥贮池207中的污泥量达到一定量，经污泥泵(图中未示出)抽到第三压滤机208压滤，产生的泥饼自动送入第三煅烧炉209内直接进行高温煅烧或者放置后间歇进行煅烧处理，得到金属氧化物，滤过液回收到第二pH调节池203继续二次处理。第二收集池206内收集的清水排入清水回收处理装置300。
综上所述，本公开的不锈钢酸洗废水处理***的有益效果是：
(1)本公开的不锈钢酸洗废水处理***用于处理不锈钢酸洗废水过程中，一方面不仅大大减少了污泥产生量和污泥含水率，而且将产生的污泥经煅烧处理后变成可回收物料，100％为有效成份，废物料无效成份为零，100％回收用于不锈钢生产制程中，有效降低了污泥处理成本和负荷，以及解决了资源浪费的问题；另一方面通过在除氟反应池加熟石灰除氟后增加树脂吸附净化***，进一步通过树脂吸附氟离子，使最终出水氟离子浓度大大降低，另外将除氟反应池反应后的沉淀物回收经压滤、煅烧处理获得高纯度CaF 2(99％含量)，从而变废为宝，避免了后续混合处理回收时，因添加量不准确而造成对不锈钢生产制程产生不良影响。
(2)进一步地，本公开的不锈钢酸洗废水处理***将混酸酸洗废水和硫酸酸洗废水分开处理，并通过设置若干酸洗废水储池，将不同钢种的生产废水进行分类存储及分批处理，使产出的污泥也分类处理，最终得到的金属氧化物中其成份含量与钢种成份相近，可以分 别回收，作为生产制程中的原材料利用于相应钢种的生产过程中，而不会对产品质量造成任何不良影响，有效解决了因混合废水排放、混合处理造成的后续污泥回收利用影响产品质量问题；同时也避免了因混合排放、混合处理过程中额外发生的化学反应Ca(OH) 2+H 2SO 4＝CaSO 4↓+2H 2O，因此大量减少了熟石灰Ca(OH) 2的添加量，避免了CaSO 4沉淀的生成，进一步减少了污泥量的产生。
(3)进一步地，本公开的不锈钢酸洗废水处理***通过将经第一压滤机压滤后的滤过液回收到第一pH调节池，经第二压滤机压滤后滤过液回收到第一收集池，经第三压滤机压滤后滤过液回收到第二pH调节池，实现上述滤过液的二次回收处理和利用，减少污染。
尽管以上较多使用了表示结构的术语，例如“酸洗废水储池”、“除氟反应池”、“树脂吸附净化***”等，但并不排除使用其它术语的可能性。使用这些术语仅仅是为了更方便地描述和解释本公开的本质；把它们解释成任何一种附加的限制都是与本公开精神相违背的。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。

Claims (10)

  1. 一种不锈钢酸洗废水处理***，其特征在于：包括混酸酸洗废水处理***和硫酸酸洗废水处理***；
    所述混酸酸洗废水处理***包括依次连通的第一pH调节池、第一浓缩膜装置、第一收集池、除氟反应池和树脂吸附净化***，所述第一浓缩膜装置的清水口与所述第一收集池连通，所述第一浓缩膜装置的浓水口还连通有第一污泥贮池，所述第一污泥贮池连通有第一压滤机，所述第一压滤机的污泥出口连通有第一煅烧炉，所述除氟反应池还连通有第二污泥贮池，所述第二污泥贮池连通有第二压滤机，所述第二压滤机的污泥出口连通有第二煅烧炉；
    所述硫酸酸洗废水处理***包括依次连通的第二pH调节池、第二浓缩膜装置和第二收集池，所述第二浓缩膜装置的清水口与所述第二收集池连通，所述第二浓缩膜装置的浓水口连通有第三污泥贮池，所述第三污泥贮池连通有第三压滤机，所述第三压滤机的污泥出口连通有第三煅烧炉；
    所述树脂吸附净化***和所述第二收集池均与清水回收处理装置连通。
  2. 根据权利要求1所述的不锈钢酸洗废水处理***，其特征在于：所述混酸酸洗废水处理***还包括若干混酸酸洗废水储池，若干所述混酸酸洗废水储池均通过第一提升泵与所述第一pH调节池连通，各个所述混酸酸洗废水储池的出水口均设置有第一电控阀；所述硫酸酸洗废水处理***还包括若干硫酸酸洗废水储池，若干所述硫酸酸洗废水储池均通过第二提升泵与所述第二pH调节池连通，各个所述硫酸酸洗废水储池的出水口均设置有第二电控阀。
  3. 根据权利要求1所述的不锈钢酸洗废水处理***，其特征在于：所述第一压滤机的出水口与所述第一pH调节池连通；所述第三压滤机的出水口与所述第二pH调节池连通。
  4. 根据权利要求1所述的不锈钢酸洗废水处理***，其特征在于：所述第一浓缩膜装置与所述第一污泥贮池的连通处设置有第一沉淀池；所述第一沉淀池的污泥出口与所述第一污泥贮池连通，所述第一沉淀池的出水口与所述第一收集池连通。
  5. 根据权利要求1所述的不锈钢酸洗废水处理***，其特征在于：所述第二浓缩膜装置与所述第一污泥贮池的连通处设置有第二沉淀池；所述第二沉淀池的污泥出口与所述第三污泥贮池连通，所述第二沉淀池的出水口与所述第二收集池连通。
  6. 根据权利要求1所述的不锈钢酸洗废水处理***，其特征在于：所述除氟反应池与所述树脂吸附净化***的连通处设置有第三沉淀池，所述第三沉淀池的出水口与 所述树脂吸附净化***连通，所述第三沉淀池的污泥出口与所述第二污泥贮池连通。
  7. 根据权利要求6所述的不锈钢酸洗废水处理***，其特征在于：所述第三沉淀池的出水口与所述树脂吸附净化***的连通处设置有膜分离装置；所述膜分离装置的出水口与所述树脂吸附净化***连通，所述膜分离装置的污泥出口与所述第二污泥贮池连通。
  8. 根据权利要求1所述的不锈钢酸洗废水处理***，其特征在于：所述第二压滤机的出水口还与所述第一收集池连通。
  9. 根据权利要求1所述的不锈钢酸洗废水处理***，其特征在于：所述树脂吸附净化***包括若干树脂吸附净化装置。
  10. 根据权利要求1所述的不锈钢酸洗废水处理***，其特征在于：所述树脂吸附净化***还分别与所述第一收集池和所述第二收集池连通。
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CN105923840A (zh) * 2016-06-20 2016-09-07 宁波宝新不锈钢有限公司 一种不锈钢无硝酸酸洗废水处理工艺
CN106746036A (zh) * 2017-03-15 2017-05-31 福建欣宇卫浴科技股份有限公司 不锈钢酸洗废水处理***
CN206654798U (zh) * 2017-03-15 2017-11-21 福建欣宇卫浴科技股份有限公司 不锈钢酸洗废水处理***

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CN112374498A (zh) * 2020-11-16 2021-02-19 咸宁嘉竹新材料科技有限公司 一种炭化料酸洗生产线及方法
CN114920374A (zh) * 2022-06-01 2022-08-19 江苏皕成环保科技有限公司 一种酸性污泥与废酸资源化回收处置设备
CN116789326A (zh) * 2023-07-27 2023-09-22 康增特材集团有限公司 一种不锈钢酸洗废水处理***及其处理池

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