CN110395816B - Acid recovery and purification system for pickling waste liquid - Google Patents

Acid recovery and purification system for pickling waste liquid Download PDF

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Publication number
CN110395816B
CN110395816B CN201910633536.XA CN201910633536A CN110395816B CN 110395816 B CN110395816 B CN 110395816B CN 201910633536 A CN201910633536 A CN 201910633536A CN 110395816 B CN110395816 B CN 110395816B
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acid
membrane
exchange resin
ion exchange
waste liquid
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CN110395816A (en
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任晓哲
秦小伟
周江
钟卫权
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Zhejiang Dongyang Environmental Engineering Co ltd
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Zhejiang Dongyang Environmental Engineering Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/42Treatment of water, waste water, or sewage by ion-exchange
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/42Treatment of water, waste water, or sewage by ion-exchange
    • C02F2001/422Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/16Nature 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
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/14Maintenance of water treatment installations
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/16Regeneration of sorbents, filters

Abstract

The invention relates to an acid recovery and purification system for pickling waste liquid, and belongs to the technical field of waste water recycling of metal finish machining. Comprises a waste acid settling device, a filtering device and an ion exchange resin recovery device in sequence. The waste acid sedimentation device is characterized by further comprising a first storage tank arranged between the waste acid sedimentation device and the filtering device, and a second storage tank arranged between the filtering device and the ion exchange resin recovery device. The purification system is used for recovering and purifying the pickling waste liquid in the metal finishing industry, and has the advantages of high purity of the cleaning acid, high-efficiency recovery, low energy consumption and less workload.

Description

Acid recovery and purification system for pickling waste liquid
Technical Field
The invention belongs to the technical field of waste water recycling of metal finish machining, and particularly relates to an acid recovery and purification system for pickling waste liquid.
Background
Strong mineral acids (sulfuric acid, nitric acid, hydrochloric acid, etc.) are commonly used in the metal finishing industry to remove oxides from the metal surface to reduce their impact on subsequent production operations. To a large extent, these oxide skins are dissolved by the acid and as the concentration of metals dissolved in the acid increases, the concentration of free acid decreases accordingly. While new acid can be added to the acid solution to compensate for this disadvantage, the oxide removal rate (pickling capacity) generally decreases as the metal concentration increases. When the scale cannot be removed sufficiently anymore, the acid liquid must be poured off and replaced with a new one.
This method of operation reduces production efficiency. The pickling capacity of the freshly prepared acid is very strong and may lead to excessive pickling, so that the material is near scrap due to pickling and thus may fail. Rework may be necessary to prevent subsequent surface treatment process problems.
In addition, the spent pickle liquor also contains large amounts of unused or "free" acid, valuable chemicals are not recovered, and the difficulty of waste water treatment is also increased. Therefore, there is an urgent need for a new and effective acid purifier recovery process.
In the prior art, the adopted device for the acid retardation technology has the problems of complex structure, large occupied area, easy pollution and scrapping of resin, low recovery rate of acid, more impurities of recovered acid, low concentration of recovered acid and the like, and poor recovery treatment effect of waste acid.
For example, the Chinese patent with application number 201710629752.8 discloses a waste acid recovery method and equipment, the method is that the waste acid is filtered and then enters a resin tank filled with acid-absorbing resin through an acid inlet pump to be pressurized for acid absorption, and the salt-containing waste water which is not absorbed is discharged to a waste water collecting tank through a water outlet; the height of the resin tank body is less than or equal to 500mm, and the filled resin is spherical particle resin. The method provided by the invention has obvious advantages in waste acid recovery, small floor area and easy operation, the acid recovery rate is 95%, the concentration of the recovered acid is concentrated to a certain degree compared with the concentration of the original free acid of the waste acid, the pure acid obtained by the concentration of the free acid of the waste acid of 10-15% can be concentrated to 20-30%, the residual quantity of metal salt of the obtained pure acid is below 1 g/L, and the application of enterprises can be met.
Still like chinese utility model patent of application number 201621013666.1 discloses a special resin short bed waste acid recovery unit, including the ion exchange column, waste acid tank, the eluant jar, the brine tank, sour holding vessel and eluant recovery tank, the top of ion exchange column is equipped with eluant import and salt water export, the bottom is equipped with waste acid import and eluant export, be equipped with first booster pump between waste acid tank and the waste acid import, first flowmeter, first filter, first valve, be equipped with the second booster pump between eluant jar and the eluant import, the second flowmeter, the second filter, the second valve, be equipped with the PH detector between brine export and the brine tank, the third valve, be equipped with H + detector and fourth valve between sour holding vessel and the eluant export, eluant recovery tank and eluant inlet pipeline intercommunication. The purpose is as follows: the waste acid recovery device solves the problems that the existing waste acid recovery device is complex in structure, large in water consumption and poor in waste acid recovery treatment effect.
Disclosure of Invention
Aiming at the problems, the invention provides an acid recovery and purification system for pickling waste liquid, which is used for recovering and purifying the pickling waste liquid in the metal finishing industry and has the advantages of high purity of cleaning acid, high-efficiency recovery, low energy consumption and less workload.
The technical scheme for solving the problems is as follows:
acid recovery and clean system of pickling waste liquid according to the treatment order of pickling waste liquid, includes in proper order:
the waste acid settling device is used for primarily removing solid-phase particle settling in the pickling waste liquid;
the filtering device is used for further removing impurities in the settled pickling waste liquid;
the ion exchange resin recovery device is used for adsorbing/desorbing acid liquor, acid is adsorbed after the filtered pickling waste liquid passes through the ion exchange resin recovery device, waste salt water is subjected to wastewater treatment, and water is input for desorption after the acid is adsorbed by the ion exchange resin recovery device to form acid liquor which is sent back to a pickling system;
also includes:
the first storage tank is arranged between the waste acid settling device and the filtering device and is used for receiving the supernatant pickling waste liquid flowing out of the waste acid settling device and storing the supernatant pickling waste liquid to enter the filtering device;
and the second storage tank is arranged between the filtering device and the ion exchange resin recovery device and is used for receiving the filtered pickling waste liquid flowing out of the filtering device and storing the filtered pickling waste liquid to enter the ion exchange resin recovery device.
Preferably, in the above technical solution, the filter device is a U-shaped hollow fiber membrane filter device, including:
the membrane shell is provided with a water producing port, a concentrated water port and a backwashing discharge port;
an upper end plate disposed in an upper region within the membrane shell;
the central pipe is arranged in the membrane shell and penetrates through the upper end plate, the upper end of the central pipe is provided with a water inlet, and the pipe wall of the central pipe is provided with a first water distribution hole;
the membrane supporting frames are arranged at the position, below the upper end plate, of the central pipe at intervals and communicated with the central pipe, membrane fixing holes and second water distribution holes are formed in the membrane supporting frames, and the opening direction of one part of the second water distribution holes points to the upper end of the membrane shell;
and the two ends of the hollow fiber membrane are fixedly connected to the upper end plate, the two ends of the hollow fiber membrane are communicated with the area above the upper end plate, and the membrane tube of the hollow fiber membrane penetrates through the membrane fixing hole and is limited in the membrane shell.
The up-down direction in the application is the same as the up-down direction in the attached figures 2-4 of the specification.
The central pipe and the membrane support frame are both provided with water distribution holes, and the membrane support frame comprises water distribution holes with partial opening directions pointing to the upper end of the membrane shell, so that water distribution is more uniform, and the problems of different membrane upper and lower stresses and different received concentration differences caused by uneven water distribution of raw material liquid are avoided.
Preferably, in the above technical solution, the water producing port is disposed on an outer wall of the membrane shell, and the outer wall is located on the upper end plate.
Preferably, in the above aspect, the concentrate inlet is provided in an outer wall of the membrane housing, and the outer wall is located below the hollow fiber membrane.
Preferably, the backwash discharge port is provided at the bottom end of the membrane shell.
Preferably, in the above technical solution, the upper end plate is an integrated end plate formed by casting epoxy resin.
Preferably, the lower end of the central tube is closed.
Preferably, the membrane support frame is composed of a plurality of outwardly extending support rods, and the membrane fixing holes and the second water distribution holes are formed in the support rods.
Preferably, according to the above technical scheme, the number of the second water distribution holes on the membrane support frame is gradually increased from top to bottom.
Preferably, according to the above technical scheme, the number of the second water distribution holes pointing to the lower end of the membrane shell along the direction of the opening on the membrane support frame is gradually increased from top to bottom.
Downwards, the quantity of the second water distribution holes of the membrane support frame, the direction of the upper opening of which points to the lower end of the membrane shell, is gradually increased, so that water distribution is more uniform during filtering, aeration during back washing can be more uniform, and the cleaning effect of the aeration on the dirt on the surface of the membrane is better.
Preferably, in the membrane shell, a sewage guide groove is arranged below the hollow fiber membrane, the sewage guide groove is funnel-shaped, the caliber of the sewage guide groove is gradually reduced from top to bottom, the sewage guide groove is particularly used for collecting and removing solid-phase substances (such as metal oxide particles) of a solid-liquid separation system, the substances have high viscosity, and the substances need to be collected and discharged by the guide groove with a guide structure.
Preferably, in the above aspect, the ion exchange resin recovery unit uses a strongly basic anion exchange resin.
Preferably Tulsion A-853E, the particle size range is 0.1 nm-0.3 mm, and the resin framework is crosslinked polystyrene.
Preferably, in the above aspect, the ion exchange resin recovery apparatus uses a short resin bed.
Preferably, a water distributor is arranged in the ion exchange resin recovery device.
Preferably, in the above aspect, the resin bed in the ion exchange resin recovery apparatus is a fixed resin bed.
Preferably, in the above technical solution, the ion exchange resin recovery device realizes desorption of acid by feeding water in a counter-current manner.
In conclusion, the invention has the following beneficial effects:
the application provides an acid recovery and purification system for pickling waste liquid, which is used for recovering and purifying the pickling waste liquid in the metal finishing industry, can continuously remove metal ions, supplement concentrated acid, ensure the concentration of acid in a pickling tank, improve the pickling speed and ensure the product quality; the workload and the acid consumption can be reduced by matching with full-automatic control; the method can also reduce the alkali consumption and the sludge production of the pickling wastewater treatment, and has low daily operation cost, and only one ton of pure water and one degree of electricity are consumed for treating each ton of waste acid.
The stable and circular treatment of the pickling solution enables the pickling capacity of the pickling solution to be kept in a moderate state, and can provide advantages for steel manufacturers:
firstly, the rework rate is reduced, and the product quality is unified;
secondly, the average pickling speed is increased, metal ions can be continuously removed, concentrated acid is supplemented, the acid concentration in a pickling tank can be ensured, and the pickling speed is increased by more than 30%;
thirdly, the consumption of chemicals is reduced, and the recovery rate of free acid is more than 90 percent;
fourthly, the waste treatment requirement is reduced, and the waste acid discharge is reduced by more than 98 percent;
the structure is simple, the occupied area is small, about 20-30 square meters, the investment cost is about 50 ten thousand yuan, and the operation cost for recycling one ton of waste acid is about 0.8 yuan;
sixthly, no large amount of alkali is needed to be added for waste acid recovery and reuse and waste water treatment.
Drawings
FIG. 1 is a schematic diagram of an acid recovery and purification system for pickling waste streams;
FIG. 2 is a schematic view of a U-shaped hollow fiber membrane filtration unit;
FIG. 3 is a schematic cross-sectional view of a U-shaped hollow fiber membrane filtration apparatus;
FIG. 4 is a schematic view of a membrane scaffold;
FIG. 5 is a schematic structural view of a spent acid settling device according to example 2;
FIG. 6 is a schematic view of the structure of the precipitation adsorption plate according to example 2;
FIG. 7 is a schematic view of the structure of an ion exchange resin recovery apparatus according to example 3;
FIG. 8 is a schematic view of a structure of the speed increasing tube according to embodiment 3;
FIG. 9 is a schematic view of a pressure increasing duct structure according to embodiment 3;
in the figure, an a-waste acid settling device, an a-1-basket, an a-2-precipitation adsorption part, an a-2.1-precipitation adsorption plate, a b-filter device, a 1-membrane shell, a 1-1-water production port, a 1-2-thick water port, a 1-3-backwashing discharge port, a 2-upper end plate, a 3-central pipe, a 3-1-water inlet, a 3-2-first water distribution hole, a 4-membrane support frame, a 4-1-membrane fixing hole, a 4-2 second water distribution hole, a 4-3-support rod, a 5-hollow fiber membrane, a 6-dirt diversion groove, a c-ion exchange resin recovery device, a c-1-speed increasing pipe, a c-1.1-folding part, a c-1.2-speed increasing port, A c-2-booster, a c-2.1-diffuser, a c-2.2-booster port, a d-first reservoir, and an e-second reservoir.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive step, are within the scope of the present invention.
The present invention will be described in detail below by way of examples with reference to the accompanying drawings.
Example 1: referring to fig. 1, an acid recovery and purification system for pickling waste liquor, which is used for treating acid-containing wastewater of metal finishing industry, such wastewater comprises phosphoric acid (20-30%), sulfuric acid (5%), nitric acid (1-2%), aluminum: not less than 75mg/L, chromium: the waste acid to be recovered by the system is mainly phosphoric acid (weak acid), as is well known, the adsorption affinity of acid radical ions is in direct proportion to the strength of the acid, strong acid radical ions have high electronegativity and are easily adsorbed by resin, and weak acid radical ions have low electronegativity and are not easily adsorbed by resin;
the pickling waste liquid sequentially flows through a waste acid settling device a, a first storage tank d, a filtering device b, a second storage tank e and an ion exchange resin recovery device c;
the waste acid settling device a is used for primarily removing solid phase particles in the pickling waste liquid by settling, the adopted reagents are sodium hydroxide and PAC, and the sediments are usually aluminum hydroxide, nickel hydroxide and chromium hydroxide;
the first storage tank d is used for receiving the supernatant pickling waste liquid flowing out of the waste acid settling device a and storing the supernatant pickling waste liquid to enter the filtering device b;
referring to fig. 2 to 4, the filtering device b is a U-shaped hollow fiber membrane filtering device, and is composed of a membrane shell 1, an upper end plate 2 disposed in the membrane shell 1, a central tube 3, a plurality of membrane supporting frames 4, and a U-shaped hollow fiber membrane 5.
Wherein, the upper part of the membrane shell 1 is provided with a water producing port 1-1, the lower part is provided with a concentrated water port 1-2 and a backwashing discharge port 1-3, an upper end plate 2 is arranged at the upper part of the membrane shell 1 by pouring epoxy resin, the upper end of a central tube 3 is provided with a water inlet 3-1, the central tube 3 passes through the upper end plate 2, a plurality of first water distribution holes 3-2 are arranged on a tube body, a plurality of membrane supporting frames 4 are arranged on the membrane shell, the number of the membrane supporting frames 4 is usually 3-5, a membrane fixing hole 4-1 for limiting a hollow fiber membrane 5 and a plurality of second water distribution holes 4-2 are arranged on the membrane supporting frame 4, wherein, on a single membrane support frame 4, the number of the second water distribution holes 4-2 and the number of the second water distribution holes 4-2 with the opening direction pointing to the membrane shell 1 are increased from top to bottom.
The lower part of the membrane shell 1 also comprises a sewage diversion trench which is used for collecting solid-phase substances of concentrated water in the filtering process and discharging the solid-phase substances out of the membrane shell 1.
During filtering, raw water flows in from a water inlet 3-1 of the central pipe 3, flows into the membrane shell 1 through the first water distribution holes 3-2 and the second water distribution holes 4-3, is filtered by the hollow fiber membrane 5, and then is produced through a water producing port 1-1, and concentrated water is discharged from a concentrated water port 1-2;
during backwashing, backwashing water enters from the end part of the hollow fiber membrane 5 above the upper end plate 2 for backwashing, meanwhile, compressed air is introduced into the central pipe 3 and performs backwashing aeration through the first water distribution holes 3-2 and the second water distribution holes 4-3 to wash dirt adhered to the surface of the hollow fiber membrane 5.
The second storage tank e is used for receiving the filtered pickling waste liquid flowing out of the filtering device b and storing the filtered pickling waste liquid to enter the ion exchange resin recovery device c;
the ion exchange resin recovery device c adopts a short resin bed, the resin is fixed in the resin bed, acid desorption is realized by adopting a countercurrent water inlet mode, strong-base anion exchange resin is filled in the resin bed, a water distributor is also arranged, the strong-base anion exchange resin is preferably Tulsion A-853E, the particle size range is 0.1 nm-0.3 mm, and the resin framework is crosslinked polystyrene.
Example 2: referring to fig. 1, 5 and 6, an acid recovery and purification system of pickling waste liquid is different from embodiment 1 in that: the waste acid sedimentation device a is internally provided with a detachable lifting basket a-1, the bottom surface of the lifting basket a-1 is provided with a sedimentation adsorption part a-2 with a porous structure, and the sedimentation adsorption part a-2 is composed of a plurality of sedimentation adsorption plates a-2.1 with pores.
When the device is in actual use, the interior of the precipitation adsorption part a-2 formed by overlapping a plurality of precipitation adsorption plates a-2.1 is composed of staggered pore structures, the pore structures enable precipitates mainly comprising aluminum hydroxide, nickel hydroxide and chromium hydroxide to be easily adsorbed in pores, meanwhile, the staggered pore structures are mutually supported, so that the precipitates are not easy to desorb out of the precipitation adsorption part a-2, when the precipitates are adsorbed to a certain degree, only the basket a-1 needs to be taken out, at the moment, because the integral structure of the precipitation adsorption part a-2 is kept intact, the precipitates can be taken out together, after the precipitates are taken out, the plurality of the precipitation adsorption plates a-2.1 overlapped together are respectively taken out, at the moment, the integral structure of the precipitation adsorption part a-2 is damaged, the precipitates can be easily scattered or scraped, and the precipitates are collected, and stacking a plurality of precipitation adsorption plates a-2.1 at the bottom of the lifting basket a-1, and then placing the precipitation adsorption plates into the waste acid settling device a.
The sedimentation collecting structure has the advantages of simple structure, high collecting efficiency, easy sedimentation separation and simple and convenient operation, and solves the problems of low sedimentation collecting efficiency and large collection difficulty in the traditional waste acid sedimentation device a.
Example 3: referring to fig. 1, 7, 8 and 9, an acid recovery and purification system of pickling waste liquid is different from embodiment 1 in that: a plurality of speed increasing pipes c-1 are arranged at a feed liquid inlet of the ion exchange resin recovery device c, the speed increasing pipes c-1 sequentially comprise a folding part c-1.1 and a speed increasing port c-1.2 according to the flowing direction of the feed liquid, the folding part c-1.1 is a section of pipe body, the inner diameter of the pipe body is gradually reduced according to the flowing direction of the feed liquid, and the speed increasing port c-1.2 is communicated with the inside of the ion exchange resin recovery device c;
a plurality of pressure pipes c-2 are arranged at a feed liquid outlet of the ion exchange resin recovery device c, the pressure pipes c-2 sequentially comprise diffusion parts c-2.1 and pressure ports c-2.2 according to the flowing direction of the feed liquid, the diffusion parts c-2.1 are sections of pipe bodies, the inner diameters of the pipe bodies gradually increase according to the flowing direction of the feed liquid, and the pressure ports c-2.2 are communicated with the outside of the ion exchange resin recovery device c;
when the feed liquid enters the ion exchange resin recovery device c from the plurality of speed-increasing pipes c-1, under the action of the furling part c-1.1, the pressure is gradually reduced, the flow rate is gradually increased, and the turbulence effect of the feed liquid in the ion exchange resin recovery device c is enhanced, so that weak acid radicals are more easily absorbed by the ion exchange resin, and the absorption efficiency is higher;
when the feed liquid flows out of the ion exchange resin recovery device c through the plurality of pressure increasing pipes c-2, the pressure is gradually increased and the flow speed is gradually reduced under the action of the diffusion part c-2.1, the pressure head of the feed liquid outside the ion exchange resin recovery device c is enhanced, the energy consumption of an external delivery pump can be reduced, and the operation cost is saved.

Claims (5)

1. Acid recovery and clean system of pickling waste liquid, its characterized in that according to the treatment order of pickling waste liquid, contains in proper order:
a waste acid settling device (a) for primarily removing solid phase particles in the pickling waste liquid by settling, a detachable lifting basket (a-1) is arranged in the waste acid settling device (a), a precipitation adsorption part (a-2) with a porous structure is arranged at the bottom surface of the lifting basket (a-1), the precipitation adsorption part (a-2) is composed of a plurality of precipitation adsorption plates (a-2.1) with pores, the interior of the precipitation adsorption part (a-2) formed by overlapping the precipitation adsorption plates (a-2.1) is composed of staggered pore structures, the pore structure makes the precipitate mainly containing aluminum hydroxide, nickel hydroxide and chromium hydroxide easily adsorbed in the pores, meanwhile, the staggered pore structures support each other, so that the precipitate is not easy to desorb out of the precipitate adsorption part (a-2);
the filtering device (b) is used for further removing impurities in the acid washing waste liquid after sedimentation;
the ion exchange resin recovery device (c) is used for adsorbing/desorbing acid liquor, acid is adsorbed after filtered acid pickling waste liquid passes through the ion exchange resin recovery device (c), waste salt water is subjected to wastewater treatment, water is input for desorption after the ion exchange resin recovery device (c) adsorbs the acid to form acid liquor, the acid liquor is sent back to an acid pickling system, the ion exchange resin recovery device (c) adopts strong-base anion exchange resin, the ion exchange resin recovery device (c) adopts a short resin bed, a water distributor is arranged in the ion exchange resin recovery device (c), the resin bed in the ion exchange resin recovery device (c) is a fixed resin bed, and the ion exchange resin recovery device (c) realizes acid desorption in a mode of countercurrent water inlet;
a plurality of accelerating tubes (c-1) are arranged at a feed liquid inlet of the ion exchange resin recovery device (c), the accelerating tubes (c-1) are sequentially composed of a furling part (c-1.1) and an accelerating port (c-1.2) according to the flowing direction of the feed liquid, the furling part (c-1.1) is a section of tube body, the inner diameter of the tube body is gradually reduced according to the flowing direction of the feed liquid, and the accelerating port (c-1.2) is communicated with the inside of the ion exchange resin recovery device (c);
the feed liquid outlet of the ion exchange resin recovery device (c) is provided with a plurality of pressurizing pipes (c-2), the pressurizing pipes (c-2) sequentially comprise diffusion parts (c-2.1) and pressurizing ports (c-2.2) according to the flowing direction of the feed liquid, the diffusion parts (c-2.1) are sections of pipe bodies, the inner diameters of the diffusion parts are gradually increased according to the flowing direction of the feed liquid, and the pressurizing ports (c-2.2) are communicated with the outside of the ion exchange resin recovery device (c);
also includes:
the first storage tank (d) is arranged between the waste acid settling device (a) and the filtering device (b) and is used for receiving the supernatant pickling waste liquid flowing out of the waste acid settling device (a) and storing the supernatant pickling waste liquid to enter the filtering device (b);
and the second storage tank (e) is arranged between the filtering device (b) and the ion exchange resin recovery device (c) and is used for receiving the filtered pickling waste liquid flowing out of the filtering device (b) and storing the filtered pickling waste liquid to enter the ion exchange resin recovery device (c).
2. The acid recovery and purification system of pickling waste liquid according to claim 1, characterized in that: the filtering device (b) is a U-shaped hollow fiber membrane filtering device, and is characterized by comprising:
the membrane comprises a membrane shell (1), wherein a water producing port (1-1), a concentrated water port (1-2) and a backwashing discharge port (1-3) are arranged on the membrane shell (1);
an upper end plate (2) disposed in an upper region within the membrane shell (1);
the central pipe (3) is arranged in the membrane shell (1) and penetrates through the upper end plate (2), a water inlet (3-1) is formed in the upper end of the central pipe (3), and first water distribution holes (3-2) are formed in the pipe wall;
the membrane supporting frames (4) are arranged at the position, below the upper end plate (2), of the central pipe (3) at intervals, the membrane supporting frames (4) are communicated with the central pipe (3), membrane fixing holes (4-1) and second water distribution holes (4-2) are formed in the membrane supporting frames (4), and part of opening directions of the second water distribution holes (4-2) point to the upper end of the membrane shell (1);
and the two ends of the hollow fiber membrane (5) are fixedly connected to the upper end plate (2), the two ends of the hollow fiber membrane are communicated with the area above the upper end plate (2), and a membrane tube of the hollow fiber membrane (5) penetrates through the membrane fixing hole (4-1) and is limited in the membrane shell (1).
3. The acid recovery and purification system of pickling waste liquid according to claim 2, characterized in that: the membrane support frame (4) is composed of a plurality of support rods (4-3) extending outwards, and the membrane fixing holes (4-1) and the second water distribution holes (4-2) are arranged on the support rods (4-3).
4. The acid recovery and purification system of pickling waste liquid according to claim 3, characterized in that: the number of the second water distribution holes (4-2) on the membrane support frame (4) is gradually increased from top to bottom.
5. The acid recovery and purification system of pickling waste liquid according to claim 3 or 4, characterized in that: according to the sequence from top to bottom, the number of the second water distribution holes (4-2) pointing to the lower end of the membrane shell (1) in the opening direction of the membrane support frame (4) is gradually increased.
CN201910633536.XA 2019-07-15 2019-07-15 Acid recovery and purification system for pickling waste liquid Active CN110395816B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910633536.XA CN110395816B (en) 2019-07-15 2019-07-15 Acid recovery and purification system for pickling waste liquid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910633536.XA CN110395816B (en) 2019-07-15 2019-07-15 Acid recovery and purification system for pickling waste liquid

Publications (2)

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