KR101615582B1 - Electrolysis reactor of high efficiency - Google Patents

Abstract

The present invention relates to an electrolysis apparatus of high efficiency and, more specifically, relates to an electrolysis apparatus which comprises an adjustment tank to increase electric conductivity of waste water to a prescribed level or higher to increase a metal extraction rate; and has a scraper installed thereon to perform electrolysis for a prescribed time and then separating a metallic component attached to a cathode bar by the scraper to recover valuable metal in a sludge form to reduce metal component recovery costs. The electrolysis apparatus of high efficiency comprises: a cylindrical electrolysis tank having a main body to store metallic waste water, a cover to cover an upper portion of the main body, and a metal slurry discharge pipe formed on a lower surface of the main body to discharge metal slurry separated by electrolysis; an outer anode pipe inserted to be adjacent to an inner wall of the main body of the electrolysis tank; a middle anode pipe arranged on the middle of the electrolysis tank, whose lower portion is inserted into the main body; a plurality of cathode bars radially arranged between the outer anode pipe and the middle anode pipe around the middle anode pipe; an agitator having a rotary shaft, an agitation wing, and a motor to rotate the rotary shaft; a scraper to scrape outer surfaces of the cathode bars to separate a metallic component attached to the cathode bars; a hydropneumatic cylinder having a lifting rod whose lower end is mounted on the scraper, a cylinder to withdraw the lifting rod, and a motor to generate a pressure of the cylinder; and a power supply unit to apply power to the outer anode pipe, the middle anode pipe, the cathode bars, the agitator, and the hydropneumatic cylinder.

Description

[0001] ELECTROLYSIS REACTOR OF HIGH EFFICIENCY [0002]

The present invention relates to a high-efficiency electrolytic apparatus, and more particularly, to a high-efficiency electrolytic apparatus comprising an electric conductivity adjusting tank for raising the metal deposition rate by raising the electric conductivity of a wastewater to a predetermined level or higher and a scraper is installed in the electrolytic apparatus, And then recovering the metal component such as sludge by separating the metal component adhered to the anode rod by a scraper, thereby reducing the cost of recovering the metal component.

BACKGROUND ART In general, scrap of electronic parts including printed circuit boards (PCBs) used in various electronic products, recycling of valuable metals from spent catalysts, which are frequently found in chemical plants, and the like, Since the wastewater generated in the factory and the wastewater generated in the photographic development contain a large amount of heavy metals, the recycling of such wastewaters and the efficient recovery of valuable metals recovered from the wastewaters are very important in terms of creating value of waste resources and preventing environmental pollution It is one of the pending issues being discussed.

However, in the case of metal waste water having a low content of valuable metals generated in the electronics industry and the plating industry, it is discharged as it is without any treatment. Recently, as environmental standards have been strengthened, wastewater treatment processes have been carried out without directly discharging metal wastewater. That is, sludge containing high concentration heavy metals is formed by chemical treatment of chemical coagulation and sedimentation by mixing a large amount of chemicals with metal wastewater.

The sludge thus separated is incinerated or buried, but this also contains heavy metals in the sludge, which releases heavy metals in the air during incineration and causes secondary contamination due to heavy metal leaching during landfilling. Of course, a method of preventing a heavy metal from leaking into the atmosphere by using a filter device may be applied, but it involves a disadvantage that the cost of replacing the filter is excessively increased and the apparatus configuration is increased, thereby increasing the facility cost.

As described above, since the chemical treatment method does not recover valuable metals, it poses a problem of environmental pollution even when it is disposed of. Therefore, a method of using electrolysis is emerging in order to compensate for the pollution.

Conventional electrolytic apparatuses are installed in such a manner that high-concentration metal wastewater is stored in an electrolytic cell by a batch method, then a negative electrode and a positive electrode plate are installed, electricity is applied, and a valuable metal component of the metal wastewater adheres to the negative electrode plate. And it is disadvantageous in that the facility area is increased in order to increase the contact area and time between the metal wastewater and the negative electrode plate and the residence time of the metal wastewater is increased to lower the economic efficiency.

The present applicant has proposed a 'copper recovery device by electrolysis' through Korean Registered Patent No. 10-1029472 (Registered April 4, 2011; hereinafter referred to as 'Prior Art 1'). As shown in FIG. 1, the collecting device 1 of the prior art document 1 has a plurality of vertically arranged collecting device cells 2 connected in series, and the metal wastewater is circulated from the lower part of the cell to the upper part. And the copper was attached to the extraction pipe (cathode) inside the cell and recovered during the turn process.

However, in the prior art 1, since the metal waste water needs to be transferred at a high pressure in order to move the metal waste water while rotating it, the power consumption is increased and the contact time between the extraction pipe and the metal waste water is shortened by high- It is not suitable for recovering valuable metals. In addition, increasing the diameter of the vertical pipe requires a larger transfer pressure, which consumes a large amount of energy to transfer the metal wastewater, which makes it difficult to increase the processing capacity.

Korean Registered Patent No. 10-1272586 (Registered on Mar. 23, 2013; hereinafter referred to as "Prior Art 2"), and a recovery system using valuable metals in waste water using electrolysis and a recovery system using the same. As shown in FIG. 2, there is provided an apparatus for recovering valuable metals from metal wastewater through electrolysis, comprising: an electrolytic bath 3 storing a metal wastewater and having a top opened; A cathode tube 4 made of a copper material, which is inserted into the electrolytic bath so as to be close to the inner wall of the electrolytic bath and has a hook at a side thereof so as to be seated on the upper end of the electrolytic bath; An anode tube (5) inserted into the cathode tube; A stirrer installed at the lower end of the rotating shaft to rotate the rotating shaft; a stirring blade installed at a lower portion of the rotating shaft to rotate the rotating shaft; A support table (7) having an elevation means for fixing the position of the anode tube and the agitator and for moving the anode tube and the agitator up and down; And a power supply unit for applying power to the cathode tube, the anode tube, and the agitator.

In the prior art document 2, the cathode tube 4 having a large diameter is disposed so as to be close to the inner wall of the electrolyzer 3, and the anode tube 5 is disposed at the center of the cathode tube so that the valuable metal is attached to the inner surface of the cathode tube have. This prior art document 2 is advantageous in that the amount of energy consumed is minimized since there is no need for a large pressure to transfer the metal wastewater. However, in the second prior art, it is difficult to separate the valuable metal attached to the inner surface of the cathode tube from the cathode tube, so that the cathode tube must be replaced at the same time. In the installed cathode tube, the valuable metal is recovered only from the inner surface facing the anode tube, And the efficiency is low.

Korean Registered Patent No. 10-1381910 (Registered on March 31, 2013; hereinafter referred to as 'Prior Art 3') proposed a cathode rod type electrolytic reaction apparatus and a highly efficient electrolytic system using the same. 3, the electrolytic reaction apparatus 8 includes an electrolytic cell 8a of a cylindrical body, an outer anode tube 8b, a middle anode tube 8c, (8f) is provided on the outer surface of the lower end of the electrolytic bath, and the ultrasonic waves of the vibrator are applied to the anode rod So that the metal component of the metal wastewater adhered to the metal wastewater is separated.

Although the prior art 3 has an advantage of recovering a metal component in the form of a slurry without replacing the anode rod, ultrasonic waves are used to separate metal components adhered to the anode rod, but the unit price of the oscillator for generating ultrasonic waves is high, If all the attached metal components can not be separated, there is a disadvantage that the degree of adhesion of the metal components in the subsequent process is lowered by the residues.

Korean Registered Patent No. 10-1029472 (Registered on April 08, 2011) - Copper recovery device by electrolysis Korean Registered Patent No. 10-1272586 (Registered on Mar. 03, 2013) - Valuable Metal Recovery Device in Waste Water Using Electrolysis and Recovery System Using It Korean Registered Patent No. 10-1381910 (Registered on March 31, 2014) - Electrolysis Reactor of Negative Electrode Bar Type and Highly Efficient Electrolysis System Using It

Accordingly, in the high-efficiency electrolytic apparatus of the present invention,

By adjusting the electric conductivity, the deposition rate of the metal component is increased, and the metal components adhered to the anode rod are scraped off by scraping, thereby separating most of the metal components adhered to the anode rod as well as repeated use of the anode rod, And an object of the present invention is to provide an electrolytic apparatus capable of increasing the component deposition rate.

The high-efficiency electrolytic apparatus of the present invention for solving the above-

An electrolytic reaction apparatus for recovering valuable metals from metal wastewater through electrolysis, comprising: a main body for storing metal wastewater; and a lid which covers an upper portion of the main body and is detachably installed inside the main body, An electrolytic cell of a cylindrical body having a metal slurry discharge pipe for discharging the metal slurry separated by the decomposition; An outer anode tube inserted into the electrolytic bath main body so as to be close to the inner wall of the electrolytic bath body and having an upper side connected to the fixing plate and spaced apart from the lower surface of the electrolytic bath; A central anode tube coupled to a fixing plate of the lid so as to be disposed at the center of the electrolytic bath and having a lower portion inserted into the body; A plurality of anode bars disposed radially between the outer anode tube and the center anode tube at regular intervals around the center anode tube and fixed vertically by a fixing plate; A rotating shaft which is rotatably supported by the electrolytic bath lid and through which a central anode tube is inserted, a stirring blade installed at a lower end of the rotating shaft and located below the electrolytic bath, and a motor installed at an upper portion of the lid, An agitator; A scraper disposed at a lower portion of a fixing plate provided in the electrolyzer and scraping the outer surface of the anode bar to separate metal components adhered to the anode bar when the reaction of the electrolyzer is completed; A pneumatic cylinder including a lift rod whose lower end is coupled to the scraper and whose upper end is disposed at an upper portion of the lid by sequentially inserting a fixed plate and a lid, a cylinder that draws the lift rod, and a motor that generates pressure of the cylinder; And a power supply unit for applying power to the outer anode tube, the center anode tube, the cathode rod, the agitator, and the pneumatic pressure cylinder.

The scraper is formed in a disk shape disposed on the inner surface of the outer anode tube and has a central anode hole through which the central anode tube is inserted at the center, and a plurality of cathode hole holes through which the anode rod is inserted between the central anode hole and the edge, So that the lifting and lowering can be performed. In addition, the scraper has a lower conical protrusion formed on the lower surface thereof, and a cathode through-hole is formed in the central axis of the conical protrusion. When the scraper descends, the conical protrusion presses the metal component attached to the anode rod in the axial direction .

Further, in the metal recovery system using the electrolytic apparatus,

1. A metal recovery system for recovering valuable metals by electrolysis from metal wastewater, comprising: a water collecting tank for pumping and introducing metal wastewater into the solid-liquid separator; A pretreatment tank which receives the metal wastewater stored in the water collecting tank and regulates pH and electric conductivity; An electrolytic bath for introducing the metal wastewater discharged from the pre-treatment bath; an outer anode tube installed close to the inner wall of the electrolyzer; a central anode tube disposed at the center of the electrolytic bath; A stirrer provided at a lower end of the rotating shaft to rotate the rotating shaft, and a stirrer disposed at an upper portion of the rotating shaft to rotate the rotating shaft; And a scraper which descends downward from the upper portion of the anode bar to scrape metal components adhered to the anode bar; A sedimentation tank in which a metallic wastewater containing a precipitated metal component discharged from the electrolytic reaction apparatus is supplied and settled, A solid-liquid separator for receiving metal sludge as a high-concentration metal component discharged from a lower part of the sedimentation tank and receiving a metal component in the form of a lump by solid-liquid separation; And a treatment water tank for receiving the upper wastewater from which the metal component is precipitated and removed from the settling tank, storing, post-treating and discharging the upper wastewater.

The electrolytic reaction apparatus may be constituted of a plurality of electrolytic reaction apparatuses, and the pretreatment tank is adjusted to have an electric conductivity of 300 to 1200 mS / cm.

The high-efficiency electrolytic apparatus of the present invention by the above-

A scraper is formed in the electrolytic device, and after the reaction, the metal component attached to the anode rod is scraped off and discharged, so that the electrode can be repeatedly used in the electrolysis reaction without replacing the anode rod, thereby reducing the maintenance cost.

In addition, since there is almost no metal component remaining in the anode rod after the scraper operation, the metal component can be more easily adhered during the re-electrolysis reaction, thereby providing an effect of increasing the metal component recovery rate.

1 to 3 are schematic views showing a conventional continuous-type valuable-metal recovering apparatus.
4 is a perspective view illustrating an electrolytic reaction apparatus according to an embodiment of the present invention.
5A and 5B are a horizontal sectional view and a vertical sectional view of an electrolytic reaction apparatus according to an embodiment of the present invention;
FIG. 5C is a partial cross-sectional perspective view showing another embodiment of the scraper according to the present invention. FIG.
FIG. 6 and FIG. 7 are schematic diagrams of a metal recovery system according to an embodiment of the present invention. FIG.
8 is a photograph showing a cathode tube to which a metal component is attached by electrolysis of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the appended drawings illustrate only the contents and scope of technology of the present invention, and the technical scope of the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the technical idea of the present invention based on these examples.

FIG. 4 is a perspective view showing an electrolytic reaction apparatus according to an embodiment of the present invention, and FIGS. 5a and 5b are a horizontal sectional view and a vertical sectional view of the electrolytic reaction apparatus according to the embodiment of the present invention.

As shown in the figure, the electrolytic reaction apparatus 30 according to the present invention includes an electrolytic bath 31. The electrolytic bath 31 is a water tank for storing metal wastewater. The electrolytic bath 31 is composed of a cylindrical main body 311 having an opened upper part and a lid 312 covering the upper part of the main body. The electrolytic bath 31 is formed by a vortex generator 35 to increase the contact ratio between the wastewater and the negative electrode to improve the adhesion of the metallic component to the negative electrode. The electrolytic bath 31 is formed in a cylindrical shape, The electrolytic bath may be formed of an insulating material to prevent electric leakage from occurring during electrolysis.

The electrolytic bath 31 communicates with an inflow pipe 314 for introducing metallic wastewater to the lower side of the main body and a wastewater discharge pipe 315 for discharging metallic wastewater having a solid metal precipitate. An intermittent valve is provided on the flow pipe 314 and the wastewater discharge pipe 315 so as to interrupt the inflow of the metal wastewater and the discharge of the metal wastewater from which the metal component has been deposited.

Next, the outer anode tube 32 and the central anode tube 33 are inserted into the electrolytic bath 31, respectively. The outer anode tube 32 is a large diameter tube which is inserted into the inner wall of the main body 311 of the electrolytic bath 31. The central anodic tube 33 is disposed at the axial center of the electrolytic bath, Diameter tubular body into which a rotary shaft 351 of a small diameter tube is inserted. The outer positive electrode tube 32 and the central positive electrode tube 33 form an anode at the time of power supply. It is preferable to use an insoluble material such as graphite, platinum, and iridium as a material, And the wastewater can be circulated to the inside and outside, and can also be formed as a net or a perforated plate.

The outer cathode tube 32 is made to have an inner surface against the entire depth of the electrolytic bath main body or only to the upper part of the lower space where the stirring wing of the stirrer is operated. As a means for separating the outer anode tube 32 from the bottom surface of the electrolytic cell, an upper portion of the outer anode tube may be inserted and fixed to the upper fixing plate 313. At this time, when the outer anode tube 32 is inserted into the electrolytic cell, the fixing plate may be caught by the electrolytic bath body 311, thereby limiting the length of the outer anode tube inserted into the electrolytic cell. The fastening of the fixing plate may be performed by the upper end of the electrolytic bath main body, or a plurality of protrusions may be formed on the inner wall surface of the upper part of the electrolytic bath main body so that the fixing plate is caught by the protrusions. By fixing the mounting position of the outer cathode tube 32 by the fixing plate, the inner wall surface of the body 311 and the outer surface of the outer cathode tube 32 can be positioned at a predetermined interval.

A plurality of anode bars 34 are disposed between the outer cathode tube 32 and the central anode tube 33 in the electrolyzer 31. The anode rods 34 are formed of copper and arranged radially at a predetermined angle or at regular intervals around the center anode tube. As shown in the drawing, the anode rods 34 may be arranged at regular intervals on a single concentric circle or at regular intervals on a plurality of concentric circles. When the cathode rods 34 are arranged in a plurality of concentric circles, A shade in which a metal component is electrodeposited by reaction only on one side of the anode rod at the time of electrolysis so that the anode rod of the outer concentric circle is positioned so that each anode rod faces the central anode tube at the inner side and the outer anode tube at the outside of the anode rod, ) Phenomenon can be prevented.

The center anode tube 33, the outer anode tube 32, and the plurality of anode bars 34 are fixed in position by a fixing plate 313. The fixing plate 313 is a circular plate fixedly or removably installed between the main body 311 and the lid 312 of the electrolytic bath 31 as shown in Figures 4 to 5B, A plurality of through holes are formed so that the central anode tube 33, the outer anode tube 32, and the plurality of anode rods 34 are positioned. At this time, the central anode tube, the outer anode tube, and the plurality of anode bars are provided with hooking rings on their outer surfaces to be positioned to be fixed in the through holes of the fixing plate, or threads are formed on the inner surface of the hole of the fixing plate 313, The outer anode tube and the anode rod are coupled to the fixing plate by using various known coupling means such as screwing to the outer surface of the anode rod 33 and the outer surface of the plurality of anode bars 34. [ can do. Also, the fixing plate may have a fixing hole 313a formed therein to join the outer cathode tube to the inner side close to the edge, and the outer cathode tube may have a protrusion portion whose upper end is inserted into the fixing hole of the fixing plate. That is, by inserting the protrusion of the upper end of the outer anode tube into the fixing hole of the fixing plate fixed by the body and the cover, the outer anode tube can fix the mounting position in the body.

The fixing plate 313 is coupled or disposed between the main body 311 of the electrolyzer and the lid as shown in the figure. The fixing plate 313 is formed to have a diameter larger than the inner diameter of the electrolytic bath main body and the fixing plate 313 is placed on the top of the electrolytic bath main body The next lid can be installed and positioned to be supported between the lid and the body. By the fixing plate 313, the central anode tube and the cathode rod, and the outer anode tube can separate the lower part and the unreacted upper part of the reaction, and the power is supplied through the central anode tube and the anode rod and the upper part of the outer anode tube And it is possible to prevent the electric wire for power connection from being in contact with the metal wastewater, thereby preventing a short circuit from occurring.

Next, in the electrolytic reaction apparatus 30, a stirrer 35 is provided to stir the metal wastewater to be desalinated into the electrolytic bath. The stirrer 35 includes a rotating shaft 351 for rotating the central anode tube 33 in the axial direction while being rotatably supported on the lid of the electrolytic cell and a stirring blade 352 disposed at the lower end of the rotating shaft, And a motor 353 installed at an upper portion of the lid, which is the upper end of the rotary shaft, for rotating the rotary shaft. The motor may further include a speed reducer to increase the torque while reducing the speed of rotation transmitted to the rotating shaft, and may further include a controller to adjust the rotation speed and the operation time. The stirring vanes 352 formed at the lower end of the rotating shaft are preferably formed such that the diameter of the swirling vane 352 is larger than at least 1/2 of the inner diameter of the electrolytic bath so that the vortex flow of the metal wastewater to be desiccated can be facilitated.

The electrolytic reaction apparatus may further include a scraper 36 and a pneumo-hydraulic cylinder 37 for raising and lowering the scraper.

The scraper 36 is disposed at the lower portion of the fixing plate and is raised and lowered by the hydraulic cylinder 37 and scrape off metal components adhered to the anode rod 34 during the lifting and lowering operation. The scrapers 36 are lifted from the inner side of the outer cathode tube 32 and can be formed into a disc shape as shown in FIG. A typical disc-shaped scraper 36 is formed to have a smaller diameter than the inner diameter of the outer anode tube 32, and a central anode hole 361 is formed at the center thereof to allow the center anode tube 33 to be inserted therethrough, A cathode through hole 362 is formed between the edges to allow the anode rod 34 to be inserted. At this time, the cathode through hole 362 is formed to have a diameter equal to or slightly larger than the diameter of the anode rod, so that the scraper scrapes off the anode rod surface when the scraper ascends and descends.

In addition, the scraper 36 has a plurality of through holes on the surface where the cathode hole and the central anode hole are not formed, so that the wastewater stored in the electrolytic bath is moved through the through hole when the scraper descends, thereby minimizing the resistance upon scraper movement.

Since the scraper 36 scrapes the outer surface of the cathode rod 34 and lifts the cathode rod 34, a large partial pressure is generated. Therefore, in order to prevent the scraper from bending due to pressure, a large number of reinforcing pieces are projected on the bottom or top surface of the scraper The structural strength can be reinforced.

5C, the scraper 36 may have a lower conical protrusion 363 formed on the lower surface thereof, and a cathode hole 362 may be formed on the central axis of the conical protrusion 363. [ That is, a conical protrusion 363 is formed at a portion where the cathode through hole is substantially formed, thereby reinforcing the structural strength, and the protruded conical protrusion divides and separates the metal components attached to the anode rod, It is possible to easily separate the deposited and deposited metal components from the wastewater.

The hydraulic cylinder 37 for raising and lowering the scraper 36 is composed of a lifting rod 371, a cylinder 372 for pulling out a part of the lifting rod, and a motor for generating a pressure of the cylinder.

The lower end of the lifting rod 371 is engaged with the scraper 36 so that the scraper is supported by at least two lifting rods so that the scraper can vertically ascend and descend. The lifting rod is connected to the cylinder 372 located above the lid by inserting the fixing plate 313 and the lid 312 in sequence. At this time, the constant cylinder is fixed to the upper part of the lid, or fixed by using a separate support, and a motor for generating pressure to the cylinder is also installed on the upper part of the lid or installed at a separate place, and the hydraulic or pneumatic . ≪ / RTI > In addition, the elevating means can be elevated by a rack and a pinion or other gear engagement.

A power supply unit 38 for applying power to the outer positive electrode tube 32, the central positive electrode tube 33, the plurality of negative electrode rods 34, the agitator 35, and the hydraulic cylinder 37 is further installed. The power supply unit 38 connects the positive electrode to the outer positive electrode tube and the middle positive electrode tube and connects the negative electrode to the negative electrode rod so that metal components in the wastewater adhere to the negative electrode rod during electrolysis. The vortex can be formed in the metallic wastewater by the operation of the wing.

The electrolytic reaction apparatus 30 for electrolyzing and precipitating the metal component of the wastewater is preferably operated in a constant current mode. This is because the current is fixed and the voltage decreases as the reaction progresses. Conversely, when operating in the constant voltage mode, there is a problem that the voltage is fixed and the resistance due to the rise of the temperature of the wastewater due to the reaction and the decrease in the pH is lowered and the current continuously increases to exceed the current supply range. Therefore, Is preferable.

As shown in FIG. 6, the metal recovery system 100 using the electrolytic reaction apparatus

And a water collecting tank (10) for pumping the metal wastewater to enter and store the wastewater. The water collecting tank temporarily stores the metal wastewater and supplies the metal wastewater to a subsequent process in a predetermined amount.

And a pretreatment tank 20 for pre-treating metal wastewater stored in the water collecting tank.

The pretreatment tank 20 can adjust the pH of the introduced metal wastewater and measure the electrical conductivity of the metal wastewater to have a predetermined level of electrical conductivity, thereby facilitating the metal precipitation in the electrolytic reaction apparatus. The electric conductivity is adjusted to be at least 300 mS / cm or more, preferably 300 to 1200 mS / cm, using sulfuric acid.

The pretreatment tank 20 may be constituted by separating the pH adjusting tank 21 and the electric conductivity adjusting tank 22 from each other, or may be constructed in a single integrated treatment tank. In the pretreatment tank, .

The metal wastewater discharged from the pretreatment tank 20 is supplied to the electrolytic reaction unit 30 to separate the metal components by electrolysis.

5B, the electrolytic reaction apparatus 30 includes an electrolytic bath 31 into which metal wastewater flows, an outer cathode tube 32 provided close to the inner wall of the electrolytic bath, a central anode tube 33), a plurality of anode rods (34) disposed between the outer anode tube and the central anode tube, a rotary shaft (351) through which the central anode tube is inserted, and a stirring blade A stirrer 35 consisting of a motor 353 for rotating the rotating shaft and a motor 353 installed on the top of the rotating shaft for rotating the rotating shaft, a scraper 36 for scraping off the metal components attached to the negative pole, And a pneumatic / hydraulic cylinder 37 for ascending / descending.

In the electrolytic reaction apparatus 30, the metal wastewater pretreated through the inlet pipe 314 flows into the electrolytic bath 31. In the electrolytic bath, power is supplied to the central anode tube, the outer anode tube 32 and the anode rod 34 And the stirring vane 352 is rotated to evenly contact the cathode and the metal wastewater to form a vortex. The agitation speed of the stirring vane is rotated at a low speed so that the metal component to be electrolyzed is supplied to the cathode- Lt; / RTI >

When electrolysis in the electrolytic bath 31 is completed, the hydraulic cylinder 37 is operated to lower the scraper 36. The descending scraper 36 separates the metal components adhered weakly to the anode rod 34 and mixes them into the metal waste water in a solid state. When the scrapper 36 separates the metal components attached to the anode bar, the scraper moves to the upper position of the original position and the metal component that is solidly deposited on the waste water discharge pipe 315 by opening the lower portion of the electrolyzer 31 The metal wastewater containing the metal wastewater is transferred to the settling tank 40. When the transfer is finished, the wastewater discharge pipe 315 is closed and the new pre-treated metal wastewater is introduced through the inlet pipe 314 to be electrolyzed, (34) a continuous electrolysis reaction can be performed without replacement.

The electrolytic reaction apparatus 30 is connected to a plurality of the electrolytic reaction apparatuses 30 in parallel and supplies metal wastewater to the pretreatment tank 20. The metal wastewater which is electrolyzed and solid- . In addition, as shown in FIG. 7, the electrolytic reaction unit 30 may be connected in series to sequentially pass through the electrolytic reaction unit to recover metal components. At this time, the wastewater discharged from the electrolytic reaction unit 30 is finally transferred to the settling tank 40, and the metal wastewater discharged from the lower portion of the electrolytic bath 31 of each electrolytic reaction unit passes through the settling tank 40, It is preferable that the water is separated and then supplied to the treatment water tank for post treatment. In addition, the waste water discharge pipe for discharging the metal waste water at the bottom of the electrolytic tank may be provided with a pump on the line to increase the transfer pressure of the metal waste water. In addition, since the wastewater in the upper part of the electrolytic cell is wastewater containing no metal component, it can be discharged directly to the settling tank, and a regulating valve can be further installed in the discharge line.

The bottom of the settling tank 40 is formed into a truncated conical shape. The sedimentation tank 40 precipitates solid precipitated metal components contained in the introduced metal wastewater, and allows the metal components to settle in most cones.

The metal sludge containing the precipitated metal component is supplied to the solid-liquid separator 60 through the sludge discharge pipe 41 at the bottom of the sedimentation tank, and the wastewater in the upper part of the sedimentation tank 40 is treated through the side of the sedimentation tank And supplies it to the water tank (50).

The solid-liquid separator 60 dehydrates the supplied metal sludge to receive a lump-shaped metal component, and the dehydrated separated water is supplied to the water collecting tank 10. Various solid-liquid separators known in the art such as centrifugal separation, vacuum separation or pressure dehydration can be applied to the solid-liquid separator 60.

The wastewater collected in the treatment water tank (50) is post-treated and discharged. The treatment water tank 50 includes a post-treatment tank 51 which is composed of a plurality of water as shown and which receives the wastewater from the sedimentation tank 40 or the solid-liquid separator 60 to remove the remaining metal components, Or may be separated into a discharge tank 52 for temporary storage and discharge, or may be integrally formed. In addition, the post-treatment tank may be formed by a method of separating a metal component by mixing chemicals to separate a residual metal component, various known post-treatment methods such as a method of filtering by a filter and a method of precipitating a metal component by its own weight Can be applied.

Hereinafter, the operating state of the metal recovery system according to the present invention will be briefly described with reference to FIG.

First, the metal wastewater collected in the water collecting tank (10) is supplied to the pretreatment tank (20), and pH concentration and electric conductivity are adjusted.

In the pretreatment tank 20, the metal wastewater pretreated through the inflow pipe 314 is supplied to the electrolytic bath 31 of the electrolytic reaction apparatus 30. Three of the electrolytic reaction apparatuses are connected in parallel, and the supplied metallic wastewater is supplied to the electrolytic bath 31 of the electrolytic reaction apparatus and is supplied to the settling tank 40 through the wastewater discharge pipe 315

At this time, electric power is supplied to the outer anode tube 32, the central anode tube 33, and the cathode rod 34 in the electrolytic cell 31 of the electrolytic reaction apparatus to electrolyze the metal components present in the metal waste water, And the stirring wing 352 is rotated to increase the contact frequency between the metal wastewater and the negative electrode to stir the metal wastewater stored in the electrolytic bath. The speed of the stirring vane 352 is stirred at a low speed so that the metal component is weakly coupled to the anode rod 34 as shown in FIG.

When the reaction is completed, the pneumatic / hydraulic cylinder 37 is operated to descend the scraper 36, and the descending scraper scrapes and separates the metal component adhered to the anode rod 34.

The metal wastewater in the lower part of the electrolytic cell containing the metal component precipitated in solid form is discharged to the settling tank 40 through the wastewater discharge pipe 315. The wastewater with almost no metal components in the upper part of the electrolytic tank is discharged to the settling tank through the side of the electrolytic tank .

In the sedimentation tank 40, the precipitated metal components are transferred to the solid-liquid separator 60 through the sludge discharge pipe 41. In the solid-liquid separator, the metal components are recovered in a lump form, So that the electrolytic reaction is performed again, and the wastewater discharged from the side of the settling tank is discharged through the treatment water tank 50 after the post treatment.

100: electrolysis system
10: Water collecting tank
20: Pretreatment tank
21: pH adjusting tank 22: electric conductivity adjusting tank
30: Electrolysis Reactor
31: electrolytic bath 32: outer anode tube
33: central anode tube 34: anode rod
35: stirrer 36: scraper
37: Pneumo-hydraulic cylinder 38: Power supply unit
311: Body 312: Cover
313: Fixing plate 313a: Fixing hole
314: Inflow pipe 315: Waste water discharge pipe
351: rotating shaft 352: stirring blade
353: Motor
361: central anode hole 362: cathode hole
363: Conic projection
371: lifting rod 372: cylinder
40: settling tank
41: sludge discharge pipe
50: Treatment tank
51: post-treatment tank 52: discharge tank
60: solid-liquid separator

Claims (6)

An electrolytic reaction apparatus for recovering valuable metal from metal wastewater through electrolysis,
A metal slurry discharge pipe for discharging the metal slurry separated by electrolysis is formed on the lower surface of the main body, and an electrolytic cell of the cylindrical body, in which a metal slurry discharge pipe for discharging the metal slurry separated by electrolysis is formed, Wow; An outer anode tube inserted into the electrolytic bath main body so as to be close to the inner wall of the electrolytic bath body and having an upper side connected to the fixing plate and spaced apart from the lower surface of the electrolytic bath; A central anode tube coupled to a fixing plate of the lid so as to be disposed at the center of the electrolytic bath and having a lower portion inserted into the body; A plurality of anode bars disposed radially between the outer anode tube and the center anode tube at regular intervals around the center anode tube and fixed vertically by a fixing plate; A rotating shaft which is rotatably supported by the electrolytic bath lid and through which a central anode tube is inserted, a stirring blade installed at a lower end of the rotating shaft and located below the electrolytic bath, and a motor installed at an upper portion of the lid, An agitator; A scraper disposed at a lower portion of a fixing plate provided in the electrolyzer and scraping the outer surface of the anode bar to separate metal components adhered to the anode bar when the reaction of the electrolyzer is completed; A pneumatic cylinder including a lift rod whose lower end is coupled to the scraper and whose upper end is disposed at an upper portion of the lid by sequentially inserting a fixed plate and a lid, a cylinder that draws the lift rod, and a motor that generates pressure of the cylinder; And a power supply unit for applying power to the outer cathode tube, the central anode tube, the cathode rod, the agitator, and the pneumatic-vacuum cylinder,
The scraper is formed in a disk shape disposed on the inner surface of the outer anode tube and has a central anode hole through which the central anode tube is inserted at the center, and a plurality of cathode hole holes through which the anode rod is inserted between the central anode hole and the edge, So that the lift-
A conical protrusion is formed on the lower surface of the scraper so that a cathode hole is formed in the central axis of the conical protrusion so that the conical protrusion can press the metal component attached to the anode rod in the axial direction when the scraper descends Wherein the electrolytic reaction apparatus comprises:
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