CN108483593B - Treatment system and method for pickling wastewater - Google Patents
Treatment system and method for pickling wastewater Download PDFInfo
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- CN108483593B CN108483593B CN201810590125.2A CN201810590125A CN108483593B CN 108483593 B CN108483593 B CN 108483593B CN 201810590125 A CN201810590125 A CN 201810590125A CN 108483593 B CN108483593 B CN 108483593B
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/484—Treatment of water, waste water, or sewage with magnetic or electric fields using electromagnets
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
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Abstract
A system and a method for treating pickling wastewater, the system comprises a pickling wastewater storage tank (1), a closed reaction tank (2), a separation tank (3) and an alkali addition tank (4), wherein the pickling wastewater containing ferrous ions introduced from the pickling wastewater storage tank (1) and the alkali slurry introduced from the alkali addition tank (4) react in the closed reaction tank (2) to generate oxide slurry containing iron, the oxide slurry containing iron is introduced into a separator (3) to be subjected to solid-liquid separation so as to separate the oxide containing iron, the system is characterized by further comprising a vacuum pump, the separator is a magnetic separator, the vacuum pump is connected to the closed reaction tank (2) and is used for pumping air out from the closed reaction tank (2) so as to ensure that the pickling wastewater containing ferrous ions and the alkali slurry react under the anaerobic condition, thereby at least generating ferroferric oxide, the mixture containing ferroferric oxide is separated by a magnetic separator. The treatment system and the treatment method provided by the invention can convert the iron ions in the pickling wastewater containing ferrous ions into ferroferric oxide, and are convenient for subsequent separation by adopting a physical method.
Description
Technical Field
The invention relates to a system and a method for treating pickling wastewater, in particular to a system and a method for recovering heavy metals and the like in wastewater and effectively recycling resources.
Background
As is well known, pickling waste water in the steel industry has been formulated as a hazardous pollutant and must not be discharged untreated into natural waters. The pickling wastewater contains various inorganic pollutants such as iron, chromium, nickel, chlorine, fluorine and the like, and if the pickling wastewater is directly discharged without being treated, the pickling wastewater can seriously pollute the water environment and waste a large amount of precious resources. The treatment of the pickling wastewater mainly comprises the following steps: the principle of the neutralization oxidation method is that ferrous ions in the pickling waste water react with alkali under the aerobic condition to be oxidized into trivalent precipitates (sludge) mainly comprising ferric hydroxide, but the sludge mainly comprising the ferric hydroxide has large volume and is not easy to be separated by a physical method.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a system and a method for treating pickling wastewater, which can convert iron ions of ferrous ions in the pickling wastewater into ferroferric oxide and facilitate subsequent separation by adopting a physical method.
In order to achieve the above object, an aspect of the present invention provides a system for treating pickling wastewater, comprising a pickling wastewater storage tank 1, a closed reaction tank 2, a separation tank 3, and an alkali addition tank 4, wherein the pickling wastewater containing ferrous ions introduced from the pickling wastewater storage tank (1) and the alkali slurry introduced from the alkali addition tank 4 are reacted in the closed reaction tank 2 to generate an oxide slurry containing iron, the oxide slurry containing iron is introduced into the separation tank 3 to be subjected to solid-liquid separation to separate the oxide containing iron, the system further comprising a vacuum pump, the separator is a magnetic separator, the vacuum pump is connected to the closed reaction tank 2 and is used for pumping air out of the closed reaction tank 2 to react the pickling wastewater containing ferrous ions and the alkali slurry under an oxygen-free condition, thereby generating an oxide containing ferroferric oxide, the precipitate containing ferroferric oxide is separated by a magnetic separator.
Preferably, the magnetic separator includes a water storage tank, a rotary magnetic column, and a magnetic substance collector, the rotary magnetic column rotates such that a portion passing through the water storage tank has magnetism to adsorb the precipitate including ferroferric oxide thereon, and a portion leaving the water storage tank loses magnetism to drop the adhered precipitate into the magnetic substance collector.
Preferably, the water storage tank at least comprises two parts, wherein the first part is at least provided with a groove, the side surface of the groove is an arc surface with the same curvature radius to accommodate the side surface of the rotary magnetic column, and a certain interval is kept between the side surface of the groove and the side surface of the rotary magnetic column so as to form a gap, so that precipitates containing ferroferric oxide in the groove are adsorbed on the rotary magnetic column when the rotary magnetic column rotates and passes through the groove; the second part is used for containing the materials left after the sediment is adsorbed by the rotating magnetic column.
Preferably, the rotating magnetic column comprises a cylindrical coil frame, N soft magnetic cores with fan-shaped sections and extending along the axial direction of the damaged coil frame are arranged in the cylindrical coil frame at equal intervals, one coil is respectively arranged on each soft magnetic core, the positive and negative polarities of electric energy applied by two adjacent coils are opposite, and N is greater than or equal to 3.
Preferably, the rotary magnetic column further comprises a rotary power supply mechanism, which comprises a shaft core and a power supply shaft sleeve, wherein 2N connecting rings are arranged at one end of the shaft core along the circumferential direction, and each pair of connecting rings is connected with two ends of one coil; be provided with 2N power supply ring along circumference in the power supply axle sleeve, when the one end of axle core set up in the power supply axle sleeve, 2N go-between of axle core and 2N power supply ring electric property swivelling joint in the power supply axle sleeve.
Preferably, the side wall of the magnetic substance collector is provided with an opening, and the shape of the wall on the upper side of the side wall is matched with the rotating magnetic column to form a scraping phase, so that the sediment including ferroferric oxide adsorbed by the rotating magnetic column is scraped by the wall and falls into the magnetic substance collector.
In order to achieve the object, another aspect of the present invention provides a method for treating acid pickling wastewater, comprising: reacting the pickling waste water containing ferrous ions introduced from the pickling waste water storage tank 1 with the alkaline slurry introduced from the alkaline addition tank 4 in the closed reaction tank 2 to generate an oxide slurry containing iron; introducing the iron-containing oxide slurry into a separation tank 3 to perform solid-liquid separation to separate iron-containing oxides; the method is characterized in that air in the closed reaction tank 2 is pumped out by a vacuum pump so that pickling wastewater of ferrous ions and alkaline slurry react under the anaerobic condition, so that generated iron oxide comprises ferroferric oxide, and the precipitate comprising the ferroferric oxide is separated by a magnetic separator.
Preferably, the magnetic separator comprises a water storage tank, a rotary magnetic column and a collecting hopper, at least part of the rotary magnetic column rotates in the water storage tank to adsorb the sediment comprising ferroferric oxide on the rotary magnetic column, and the adhered sediment rotates to the opening of the side wall of the collecting hopper and falls into the collecting hopper.
Preferably, the magnetic separator includes a water storage tank, a rotary magnetic column, and a magnetic substance collector, the rotary magnetic column rotates such that a portion passing through the water storage tank has magnetism to adsorb the precipitate including ferroferric oxide thereon, and a portion leaving the water storage tank loses magnetism to drop the adhered precipitate into the magnetic substance collector.
Preferably, the part of the rotating magnetic cylinder in the groove has magnetism, and the part leaving the groove loses magnetism.
Compared with the prior art, the system and the method provided by the invention have the advantages that the acid washing wastewater of iron ions and the alkaline slurry react under the anaerobic condition, so that the generated iron oxide comprises ferroferric oxide, and the ferroferric oxide has magnetism and is convenient to separate by a physical method.
Drawings
FIG. 1 is a schematic view showing the composition of a system for treating pickling waste water according to a first embodiment of the present invention;
FIG. 2 is a schematic sectional view of a magnetic separator according to a first embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a rotary power mechanism provided in accordance with a first embodiment of the present invention;
fig. 4 is a circuit diagram of a power supply provided by the first embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 should be noted that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; the two components can be electrically connected, directly connected, indirectly connected through an intermediate medium, or communicated with each other, and specific meanings of the above terms in the present invention can be understood by those skilled in the art in specific cases.
First embodiment
FIG. 1 is a schematic diagram showing the composition of a system for treating pickling wastewater according to a first embodiment of the present invention, and as shown in FIG. 1, the system for treating pickling wastewater comprises a pickling wastewater storage tank 1, a closed reaction tank 2, a separator 3 and an alkali addition tank 4, wherein the pickling wastewater containing ferrous ions, which is introduced from the pickling wastewater storage tank 1, is reacted with an alkaline slurry, which is introduced from the alkali addition tank 4, in the closed reaction tank 2 to generate an oxide slurry containing iron, and the pickling wastewater containing ferrous ions includes, but is not limited to, ferrous sulfate (FeSO)4) Ferrous chloride (FeCl)2)，Fe2+The ion concentration is preferably 400-1000 mg/L, and the alkali comprises one of the following substances: slaked lime, quicklime and sodium hydroxide; the oxide slurry thus contained is introduced into a separator 3 and subjected to solid-liquid separation to separate the oxide slurry containing iron.
According to an embodiment of the present invention, the system for treating pickling waste water further comprises a vacuum pump connected to the closed reaction tank 2 for pumping air out of the closed reaction tank 2 to allow the pickling waste water of ferrous ions to react with the alkaline slurry under an oxygen-free condition, so that iron oxide precipitate is generated, which is blue-green in color; the iron oxide precipitate contains ferroferric oxide. When the iron oxide precipitate is formed, heavy metals such as lead, zinc, cadmium and the like in the pickling wastewater enter the interlayer of the iron oxide precipitate and precipitate.
According to an embodiment of the present invention, the system for treating pickling wastewater further comprises an inert gas storage tank connected to the closed reaction tank 2, so that inert gas is filled after air in the closed reaction tank 2 is pumped out by a vacuum pump, and the pickling wastewater containing ferrous ions and alkaline slurry react under an inert atmosphere, so that the generated iron oxide comprises ferroferric oxide, and the ferroferric oxide has magnetism and is convenient to separate by a physical method.
In order to generate the iron compound containing ferroferric oxide, the treatment system for pickling wastewater further comprises a control subsystem 10, a pH sensor 8 and a temperature detection sensor which are arranged in the reaction tank, wherein the pH sensor 8 is used for measuring the pH of the slurry in the closed reaction tank 2, the control system 10 is used for controlling the amount of the slurry conveyed by the alkali adding tank 4, at least a weighing device and an electric control device controlled by an electric control switch 6 are arranged in a path for conveying the alkaline substances to the reaction tank 2 by the alkali adding tank 4, the weighing device is used for weighing the amount of the alkaline substances added into the reaction tank, when the alkaline substances are added to the reaction tank 2, the control system 10 controls the electric control switch 6 to open the electric control device, and after the alkaline substances are added, the electric control device is closed. The pickling waste water stored in the pickling waste water storage tank 1 contains a large amount of free acid, and is separated to recover the free acid, and then the solution including heavy metal ions is introduced into the reaction tank 2. Although not shown in fig. 1, an electrically controlled valve is also provided in a passage for adding the solution containing heavy metal ions derived from divalent iron to the reaction tank 2 from the pickling waste water storage tank 1, and when the solution containing heavy metal ions derived from divalent iron is added to the reaction tank 2, the control system 10 controls the electrically controlled valve to open a passage for adding the solution containing heavy metal ions derived from divalent iron to the reaction tank, and after the addition is completed, closes a passage for adding the solution containing heavy metal ions derived from divalent iron to the reaction tank. A control valve controlled by an electrically controlled switch 7 is also provided in a passage for conveying the precipitate (precipitate) containing ferroferric oxide from the reaction tank 2 to the separator 3, and when the substance in the reaction tank 2 needs to be introduced into the separator 3, the control system 10 controls the electrically controlled switch 7 to open the passage and close the passage after the conveyance. An electric control device controlled by an electric control switch 11 is also arranged in the channel for adding the alkali into the alkali adding tank 4, when the alkali is required to be added into the alkali adding tank, a control system 10 controls the electric control switch 7 to open the channel, and after the conveying is finished, the channel is closed. The invention sets electric control device in the path of the import material and export material of the reaction tank 4, when adding or exporting material, the electric control device is opened, otherwise, it is closed, thus cutting off the import air from outside to the reaction tank 2, thus when the vacuum pump pumps out the air in the reaction tank 2, the work load is reduced, and the work efficiency is improved.
The slurry discharged from the reaction tank 2 is introduced into a separator 3, and the precipitate containing ferroferric oxide is separated by a magnetic portion of a magnetic separator. And adding an alkali reagent to a part or all of the discharged substances containing ferroferric oxide to adjust the pH to 11-13, returning the substances to the reaction tank 2, repeatedly performing reductive precipitation for generating iron, arranging a pH sensor 9 in the alkali addition tank 4 for measuring the pH value of the slurry in the alkali addition tank 9, and transmitting the measured value to a control system. An electric control device controlled by an electric control switch 12 is also arranged in a passage for adding alkali into the alkali adding tank 9, when the alkali needs to be added, the control system 10 controls the electric control switch 12 to open the channel, and after the alkali is added, the channel is closed.
In the present invention, the temperature sensor is used to monitor the reaction temperature in the reaction tank 2, and the reaction is carried out in a non-oxidizing atmosphere and under an alkaline condition of pH 8.5 to 11, preferably pH 9.0 to 10. The liquid temperature is about 10-30 ℃, and heating is not needed. The reaction time is about 30 minutes to 3 hours. Further, the reaction vessel is not sealed, and the iron compound containing ferrosoferric oxide is not produced when the reaction vessel is not in a non-oxidizing atmosphere or when the degree of alkali is weak.
In order to form an iron compound containing iron oxide in the reaction vessel such that the ratio of the precipitated ferrous iron ions to the total iron ions is 0.4 to 0.8, the iron ion ratio is preferably 0.55 to 0.65. If the ratio is outside the above range, the reduction of heavy metals is insufficient, or the settleability of the precipitate is deteriorated.
In the reaction tank 2, the alkaline precipitation is repeatedly returned, and the reaction with the heavy metal ions in the pickling wastewater is repeatedly performed, so that the precipitate containing ferroferric oxide is gradually changed to black, and the precipitate initially in a dark blue-green color is gradually changed to black. Further, since the sludge (precipitate) is made ferrous while maintaining the reducibility thereof, consolidation of the precipitate is promoted, and the concentration of the precipitate is significantly increased, thereby improving the effect of removing heavy metals.
In this embodiment, the separator 3 is a magnetic separator, which is described in detail below with reference to fig. 2.
FIG. 2 is a schematic sectional view of a magnetic separator according to a first embodiment of the present invention; as shown in fig. 2, the magnetic separator provided by the present invention includes a water storage tank 301, where the water storage tank 301 includes at least two parts, the second part is disposed below the first part or downstream of the fluid, the first part is at least provided with a groove 302, a side surface of the groove 302 is an arc surface with the same curvature radius to accommodate a side surface of the rotating magnetic column, and protects a certain interval with the side surface of the rotating magnetic column to form a gap so that when the rotating magnetic column rotates and passes through the groove, precipitates containing ferroferric oxide in the groove are adsorbed on the rotating magnetic column; the second part is used for containing the solution and/or water left after the sediment is adsorbed by the rotary magnetic column; the side of the water storage tank 301 is at least provided with a water outlet 303, and according to an embodiment of the present invention, the liquid contained in the second part of the water storage tank 301 can be reintroduced into the first part by using a water pump and a pipeline, so as to adsorb the magnetic sediment in the liquid again.
The magnetic separator 3 comprises a rotary magnetic cylinder comprising a rotary shaft 307 and a cylindrical bobbin 308, the rotary shaft 307 and the cylindrical bobbin 308 being connected by a plurality of radial connectors 316. N soft magnetic cores, preferably made of silicon steel sheets, having a sector-shaped cross section are disposed at equal intervals in the cylindrical bobbin 308, and one coil, such as the coil 309, is disposed on each soft magnetic core. The rotary magnetic column also comprises a rotary power supply mechanism, the rotary power supply mechanism comprises a shaft core 407 and a power supply shaft sleeve 2, 2N connecting rings are arranged at the first end of the shaft core 407 along the circumferential direction, 2N binding posts are uniformly arranged at the second end of the shaft core 407 along the circumferential direction, one binding ring is electrically connected with one binding post, and each pair of binding posts is respectively connected with two ends of one coil; be provided with 2N power supply rings along circumference in the power supply axle sleeve, when the one end of axle core 407 set up in the power supply axle sleeve, 2N go-between of axle core 407 and 2N power supply ring electric property swivelling joint in the power supply axle sleeve. In use, the second end of the shaft core 407 is fixed to the shaft 307 of the rotating magnetic cylinder. The outermost layer of the rotary magnetic column is provided with a protective cylinder.
The magnetic separator 3 further includes a magnetic substance collector 310 having a funnel-shaped lower portion, and a discharge hole provided at the center of the lower end of the funnel, the discharge hole being opened or closed by a valve. The side wall of the magnetic substance collector 310 is provided with an opening, and the shape of the wall 313 on the upper side of the side wall is matched with the rotary magnetic cylinder, namely, the wall has the same curvature as the rotary magnetic cylinder, and the radius of the wall is slightly larger than that of the rotary magnetic cylinder so that the magnetic substance adsorbed by the rotary magnetic cylinder is scraped by the wall 313 and falls into the magnetic substance collector 310.
In the present invention, in order to use at least a part of the side wall of the magnetic material collector as a scraping blade to scrape the adsorbed material from the rotating magnetic cylinder and drop it into the magnetic material collector, it is necessary that the projections of the magnetic material collector and the rotating magnetic cylinder from top to bottom overlap, that is, the rotating magnetic cylinder is always partially put into the cavity formed by the magnetic material collector, and the recess 302 for containing the contaminated water with magnetic flocs (sediments) to be purified is in the projection of the rotating magnetic cylinder from bottom to bottom. In addition, because the rotary magnetic column is always rotating, the magnetic floccules adsorbed on the rotary magnetic column also rotate together, and when the rotary magnetic column drops from the rotary magnetic column due to partial loss of magnetism, the magnetic floccules can do parabolic motion, so that the magnetic floccules can directly fall into the magnetic substance collector. The magnetic flocs scraped from the rotating column by the scraping sheet can also do parabolic motion and can directly fall into the magnetic substance collector.
The working process of the magnetic separator provided by the invention is as follows: when the liquid containing the magnetic coagulates is discharged into a water tank above the water storage tank 301 from the water pipe 305, direct current is conducted on a part of coils in the rotary magnetic column, so that the rotary magnetic column enters the groove 302 to generate a magnetic field, the sediment containing ferroferric oxide in the liquid in the groove 302 is adsorbed by the protective cylinder, when the rotary magnetic column part adsorbing the sediment containing ferroferric oxide moves to the magnetic substance collector, the power is cut off, the magnetism is lost, the adsorbed substances fall into the magnetic substance collector, and the part which does not fall clean is scraped by the wall 313. When the rotary magnetic column rotates, a part of the coil close to the groove 302 is electrified to generate a magnetic field to adsorb the magnetic precipitate in the liquid, and the above process is repeated, so that the adsorption capacity of the electromagnet can be controlled.
According to one embodiment, the electric energy is applied to the coils, the positive polarity and the negative polarity of the electric energy applied to the adjacent two coils are opposite, so that the adjacent two electromagnets are arranged in an N polarity, an S polarity and an N polarity, namely the polarities of the adjacent two electromagnets are the same, and the coil rack between the adjacent two electromagnets is provided with the magnetic flux dividing groove, so that the magnetic field presented to the outside by the rotating magnetic column is enhanced. The magnetic separator shown in fig. 2 includes 10 electromagnets, but this configuration is merely an example, and the number of electromagnets may be at least 3.
In this embodiment, the outer cylinder 317 is disposed around the cylindrical bobbin 308, and both ends of the outer cylinder are provided with radially extending portions to enclose the cylindrical bobbin 308 and the electromagnet disposed thereon, so that the electromagnet can be protected. The outer cylinder 317 may be made of a resin material that does not shield the magnetic field generated by the electromagnet.
The bobbin 308 and the bobbin 316 of the rotating magnetic cylinder are made of a non-magnetic material, preferably a non-magnetic metal (e.g., aluminum). Or may be formed of a resin material to reduce the weight of the rotating magnetic cylinder, thus saving the kinetic energy for driving the rotation of the magnetic cylinder.
Fig. 3 is a schematic cross-sectional view of a rotary power supply mechanism according to a first embodiment of the present invention, and as shown in fig. 3, the rotary power supply mechanism according to the present invention includes a shaft core 407 and a power supply bushing 401, wherein a portion of one end of the shaft core 407 includes 2N conductive rings (power supply rings) with the same radius, such as conductive rings 405, and adjacent first conductive rings 405 are separated by an insulating material; the sidewall of the shaft core 407 is circumferentially provided with 2N first connector lugs; the 2N first conductive rings and the 2N first terminals are respectively electrically connected through a conductive wire, such as 406; the power supply bushing 401 includes 2N second conductive rings, such as the conductive ring 404, which are matched with the 2N first conductive rings and are connected to each other by rotational power, and 2N second wire connectors, such as the connector 423, where the 2N second wire connectors are respectively electrically connected to the 2N second conductive rings, such as the conductive ring 405 is electrically connected to the wire connector 403 through the wire 402; and N is an integer greater than or equal to 3.
In the invention, the electric energy provided by a power supply is connected to the connector 403 on the power supply shaft sleeve 401 through an electric wire, and the shaft core 407 is fixed on the shaft 307 of the rotary magnetic column, so that when the rotary magnetic column is driven to rotate by the driving mechanism, the shaft core 407 also rotates in the power supply shaft sleeve 401, the electric energy of the power supply is provided through the N coils, the power supply condition of the N coils is controlled through the controller, the magnetism of the N electromagnets is controlled, and the part of the rotary magnetic column in the groove has magnetism, and the part of the rotary magnetic column away from the groove loses magnetism. The power supply for providing power to the N coils of the N electromagnets is described in detail below with reference to fig. 4.
Fig. 4 is a circuit diagram of a power supply according to a first embodiment of the present invention, and as shown in fig. 4, the power supply includes: the photovoltaic energy conversion system comprises a controller 611, a photovoltaic cell 601, an inverter, a rectifier D601, an electric switch S6 and a transformer T1, wherein the photovoltaic cell 601 is arranged outdoors or on a roof, energy output by the photovoltaic cell 601 is stored in a super capacitor C601, the inverter is used for converting direct current electric energy output by the photovoltaic cell into alternating current electric energy and comprises field effect transistors T61 to T64, the field effect transistor T61 is connected with the field effect transistor T62 in series, the field effect transistor T63 is connected with the field effect transistor T64 in series, the two branches are connected in parallel, a control end of each field effect transistor is connected with a phase controller (not shown in figure 4), and the phase controller controls the working states of the four field effect transistors so that the direct current electric energy output by the photovoltaic cell 601 is converted into alternating current electric energy. The rectifier D601 is used for converting alternating current into pulsating direct current; the inverter package T2 includes a first primary coil L65, a second primary coil L64, a third primary coil L67, and N secondary coils L66-1, …, L66-N, a controller 611 controls an electric switch S5 to apply pulsating direct current to the first primary coil, a controller controls an auxiliary power supply 612 to be connected to the third primary coil L67, and alternating current output from the N secondary coils is rectified and filtered by N coils of the N electromagnets of the rotary power supply mechanism to generate magnetic fields. The solar power supply further comprises an input voltage detector 602, an output voltage detector and an output signal period detection circuit, wherein the output signal period detection circuit comprises a zero-crossing detection circuit 603, a comparator 608, a shift register 609, a latch 607, a clock signal generator 606, a first AND gate 605, a second AND gate 610 and an inverter 604, the voltage detector 602 is used for detecting the voltage input to the rectifier D601, a first input end of the voltage detector is connected to a middle node of the connection of the electric switch T61 and the electric switch T62 through an inductor L61, a second input end of the voltage detector is connected to the middle node of the connection of the electric switch T63 and the electric switch T64, and an output end of the voltage detector is connected to an inverting end of the comparator 608; two signal input terminals of the zero-cross detection circuit 603 are connected to the second primary coil L64, and are used for detecting the period of the output voltage to generate a square wave with the period consistent with the period of the output voltage; the input end of the inverter 604 is connected to the signal output end of the zero-crossing detector 603, and the output end is connected to the first input end of the first and gate 605 and the first input end of the second and gate 610, respectively; the signal output end of the clock signal generator 606 is connected to the second signal input end of the first and gate 605 and the clock end of the shift register 609 respectively; the inverting terminal of the comparator 608 is connected to the signal output terminal of the voltage detector 602, the non-inverting terminal is connected to one terminal of the second primary winding L64, and the second primary winding L64 is an output voltage detector; the output of the comparator 608 is connected to the signal input of the shift register 609; the signal output terminal of the shift register 609 is connected to the signal input terminal of the latch 607, and the latch 607 is preferably a D flip-flop; the signal output end of the D flip-flop is connected to the second signal input end of the second and gate 610, the signal output end of the second and gate 610 is connected to the controller 611 through the driver S5, and the controller 611 controls the operating state of the electric switch S5 according to the input signal.
The power supply further comprises a second transformer T2 comprising a primary winding L62 and N secondary windings L63-1, …, L63-N, the primary winding of the second transformer T2 being connected in parallel to the first primary winding of the first transformer T1, a capacitor C602 and a diode D602 being arranged in series between the non-inverting terminal of the primary winding of the second transformer T2 and the inverting terminal of the first primary winding of the first transformer T1. N secondary coils of the second transformer are respectively connected with N secondary coils of the first transformer in series and then are respectively connected with N coils of N electromagnets through a rotary power supply mechanism to generate a magnetic field. The non-inverting terminal of the primary coil of the second transformer T2 provides a signal to the controller 611 through the resistor R61 to detect the voltage values input to the transformer voltages T1 and T2. N secondary coils of the transformer T2 are respectively connected in series with N secondary coils of the transformer T1 and rectified by a rectifying circuit to form pulsating direct current, the pulsating direct current is filtered by a filter circuit to form direct current, and the direct current is supplied to N coils of N electromagnets by a rotary power supply mechanism to generate magnetic fields and provide electric energy, wherein the rectifier is D603-1, … and D603-N, and the filter is C61-1, … and C61-N.
The power that this embodiment so set up, by photovoltaic cell power supply when sunshine is sufficient, by auxiliary power supply when sunshine is not sufficient, simultaneously this power owing to adopted output signal cycle detection circuit, the on-off time of signal control electric switch S5 that controller 611 provided according to output signal cycle detection circuit to the output of power has been stabilized, has further improved the stability of power.
The pickling waste water treatment system provided by the second embodiment of the present invention is different from the pickling waste water treatment system provided by the first embodiment only in the composition of the magnetic separator, and the magnetic separator provided by the second embodiment comprises the components of the magnetic separator provided by the first embodiment, and further comprises: the side wall of the non-magnetic precipitation collector is provided with an inclined surface, and a filter screen is arranged on the inclined surface, wherein the filter screen is a filter formed by stainless steel thin wires, copper thin wires, polyester fibers and the like and provided with meshes, and the diameter of each mesh ranges from several micrometers to tens of micrometers. Precipitates or deposits of magnetic substances existing in the liquid in the groove 302 are absorbed away by the magnetic rotating column, and large non-magnetic precipitates existing in the liquid are collected in a non-magnetic precipitate collector; finally, fine precipitated substances still present in the liquid are precipitated in the water storage tank 301.
The power supply is powered by the photovoltaic cell when the sunlight is sufficient, and is powered by the auxiliary power supply when the sunlight is insufficient, and meanwhile, the power supply adopts the output signal period detection circuit, and the controller 611 controls the on-off time of the electric switch S5 according to the signal provided by the output signal period detection circuit, so that the output of the power supply is stabilized, and the stability of the power supply is further improved.
The working principle of the invention is explained in detail above with the accompanying drawings. Those skilled in the art will appreciate that the description is for interpretation of the claims only. The scope of the invention is not limited by the description. Any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the disclosure of the present invention should be covered within the protective scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A treatment system of pickling waste water comprises a pickling waste water storage tank (1), a closed reaction tank (2), a separator (3) and an alkali addition tank (4), wherein the pickling waste water containing ferrous ions introduced from the pickling waste water storage tank (1) and the alkali slurry introduced from the alkali addition tank (4) react in the closed reaction tank (2) to generate oxide slurry containing iron, the oxide slurry containing iron is introduced into the separator (3) to be subjected to solid-liquid separation so as to separate the oxide containing iron, and the treatment system is characterized by further comprising a vacuum pump, wherein the separator is a magnetic separator, the vacuum pump is connected to the closed reaction tank (2) and is used for pumping air out from the closed reaction tank (2) so as to enable the pickling waste water containing ferrous ions to react with the alkali slurry under the anaerobic condition to generate at least ferroferric oxide, the magnetic separator comprises a rotary magnetic column, wherein the part of the rotary magnetic column in the groove has magnetism, and the part of the rotary magnetic column leaving the groove loses magnetism; be provided with 2N power supply ring along circumference in the power supply axle sleeve, when the one end of axle core set up in the power supply axle sleeve, 2N go-between of axle core and 2N power supply ring electric property swivelling joint in the power supply axle sleeve.
2. The pickling wastewater treatment system of claim 1, wherein the magnetic separator further comprises a water storage tank column and a magnetic substance collector, and when the rotary magnetic column rotates, a part passing through the water storage tank is magnetic to adsorb the precipitate containing ferroferric oxide thereon, and a part leaving the water storage tank loses magnetism to drop the adhered precipitate into the magnetic substance collector.
3. The pickling wastewater treatment system according to claim 2, wherein the water storage tank comprises at least two parts, the first part is at least provided with a groove, the side surface of the groove is an arc surface with the same curvature radius to accommodate the side surface of the rotating magnetic column, and a certain interval is kept between the side surface of the groove and the side surface of the rotating magnetic column so as to form a gap, so that precipitates containing ferroferric oxide in the groove are adsorbed on the rotating magnetic column when the rotating magnetic column rotates and passes through the groove; the second part is used for containing the materials left after the sediment is adsorbed by the rotating magnetic column.
4. The pickling waste water treatment system of claim 3, wherein the rotary magnetic column comprises a cylindrical coil frame, N soft magnetic cores with fan-shaped sections and extending along the axial direction of the coil frame are arranged in the cylindrical coil frame at equal intervals, one coil is respectively arranged on each soft magnetic core, the positive and negative polarities of electric energy applied by two adjacent coils are opposite, and N is greater than or equal to 3.
5. The pickling wastewater treatment system according to claim 4, wherein the side wall of the magnetic material collector is provided with an opening, and the shape of the upper wall of the side wall is matched with the rotary magnetic column to form a scraping sheet, so that the precipitate including ferroferric oxide adsorbed by the rotary magnetic column is scraped by the wall and falls into the magnetic material collector.
6. A method for treating pickling wastewater, comprising the following steps: reacting the pickling waste water containing ferrous ions introduced from the pickling waste water storage tank (1) with the alkaline slurry introduced from the alkali addition tank (4) in the closed reaction tank (2) to generate oxide slurry containing iron; the method is characterized in that air in a closed reaction tank (2) is pumped out by a vacuum pump so that pickling wastewater of ferrous ions and alkaline slurry react under the oxygen-free condition, so that the generated iron oxide comprises ferroferric oxide, and precipitates comprising the ferroferric oxide are separated by a magnetic separator, wherein the magnetic separator comprises a rotating magnetic column, the part of the rotating magnetic column in a groove has magnetism, the part of the rotating magnetic column away from the groove loses the magnetism, the rotating magnetic column further comprises a rotating power supply mechanism which comprises a shaft core and a power supply shaft sleeve, one end of the shaft core is provided with 2N connecting rings along the circumferential direction, and each pair of connecting rings is connected with two ends of one coil of the rotating magnetic column; be provided with 2N power supply ring along circumference in the power supply axle sleeve, when the one end of axle core set up in the power supply axle sleeve, 2N go-between of axle core and 2N power supply ring electric property swivelling joint in the power supply axle sleeve.
7. The method for treating pickling wastewater according to claim 6, wherein the magnetic separator comprises a water storage tank and a collecting hopper, at least part of the rotary magnetic column rotates in the water storage tank to adsorb the precipitate containing ferroferric oxide thereon, and the adhered precipitate rotates to an opening in a side wall of the collecting hopper and falls into the collecting hopper.
8. The method for treating pickling wastewater according to claim 7, wherein the magnetic separator further comprises a water storage tank and a magnetic substance collector, wherein when the rotary magnetic column rotates, a portion passing through the water storage tank is magnetic to adsorb the precipitate containing ferroferric oxide thereon, and a portion leaving the water storage tank is non-magnetic to drop the adhered precipitate into the magnetic substance collector.
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| CN201810590125.2A CN108483593B (en) | 2018-06-08 | 2018-06-08 | Treatment system and method for pickling wastewater |
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| CN109292937A (en) * | 2018-12-09 | 2019-02-01 | 安徽航天环境工程有限公司 | A kind of iron content pickling sludge reuse method |
| CN115557581B (en) * | 2022-10-28 | 2023-05-23 | 湖南岳大环保科技有限公司 | Waste liquid recycling equipment |
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| JP4648917B2 (en) * | 2007-03-27 | 2011-03-09 | 株式会社日立製作所 | Magnetic separation filtration purification device |
| CN201205513Y (en) * | 2008-05-22 | 2009-03-11 | 叶煜 | Magnetic separator |
| CN101670266B (en) * | 2009-11-10 | 2011-09-07 | 北京林业大学 | Method for removing organic cationic dyes from waste water by magnetic nano adsorption material |
| CN102380111B (en) * | 2010-08-27 | 2012-12-12 | 上海交通大学医学院附属第九人民医院 | Method for preparing <125>I mark product for ferroferric oxide nanoparticles and application thereof |
| KR101498374B1 (en) * | 2013-07-29 | 2015-03-03 | 한국에너지기술연구원 | Method for manufacturing iron based catalyst and iron based catalyst manufactured by the same |
| CN106334623B (en) * | 2016-10-09 | 2018-08-21 | 京磁材料科技股份有限公司 | Disc type magnetic mud separator |
| CN206143035U (en) * | 2016-10-19 | 2017-05-03 | 北京航天斯达科技有限公司 | Magnetic seed recovery plant |
| CN107694510B (en) * | 2017-11-14 | 2020-04-24 | 南昌大学 | Method for removing methylene blue in printing and dyeing wastewater by two-dimensional magnetic MXene |
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