JP2016169400A - Sludge recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge recovery device capable of efficiently recovering sludge containing cemented carbide from a sludge-containing container.SOLUTION: A device for recovering sludge from a solution containing sludge containing magnetic materials includes: a cylindrical treatment container that allows the solution to flow therethrough; a bar-shaped magnetic adsorption member that is disposed in the treatment container and extends along the axial direction of the treatment container; a solution supply port that is formed in one side in the axial direction of the treatment container; and a solution discharge port that is formed in the other side in the axial direction. The solution supplied from the solution supply port is made to flow in a vortex around an axis inside the treatment container, whereby the sludge is adsorbed on the magnetic adsorption member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sludge recovery device.

  Carbide tools widely used in the manufacturing process of the manufacturing industry are mainly made of tungsten. Tungsten is one of the rare metals, and its recycling is important for resource strategy. Conventionally, a technique for separating and recovering tungsten carbide (WC) and binder from cemented carbide scrap is known (see Patent Document 1).

JP 2009-191328 A

  On the other hand, in the manufacturing process of a cemented carbide tool, a solution containing a large amount of grinding sludge is generated when the cemented carbide base material is processed into a desired tool shape. In order to recycle rare metals from this sludge-containing liquid at low cost, it is necessary to select sludge containing cemented carbide from the sludge-containing solution and recycle sludge having a high cemented carbide content.

  An object of the present invention is to provide a sludge recovery device that can efficiently recover sludge containing cemented carbide from a sludge-containing container.

  According to one aspect of the present invention, there is provided an apparatus for recovering the sludge from a solution containing sludge containing a magnetic substance, and a cylindrical processing container that circulates the solution therein, and is disposed in the processing container. A rod-shaped magnetic adsorption member extending along the axial direction of the processing container, a solution supply port provided on one side in the axial direction of the processing container, and a solution discharge port provided on the other side in the axial direction; There is provided a sludge recovery device that causes the solution supplied from the solution supply port to circulate in a spiral around the axis inside the processing container to adsorb the grinding sludge to the magnetic adsorption member.

  According to this configuration, the sludge can be adsorbed by the magnetic adsorption member while forming a vortex of the sludge-containing solution in the processing container and separating the sludge in the processing container. Thereby, sludge with few impurities can be collect | recovered efficiently.

The processing container is arranged in an axially standing state, the solution supply port is provided on the lower side of the side surface of the processing container, and the solution discharge port is provided on the upper side of the side surface of the processing container. Good.
It is good also as a structure which has the collection | recovery lid | cover which opens and closes the bottom part of the said processing container under the said magnetic adsorption member, and the sludge scraping member provided so that the surface of the said magnetic adsorption member could slide freely in a longitudinal direction.
It is good also as a structure by which the nonmagnetic member tapered toward the bottom is provided in the lower end part of the said magnetic adsorption member.
A plurality of the magnetic adsorption members may be arranged around the axis of the processing container.
The magnetic adsorption member may include a neodymium magnet.
An atmosphere release valve may be connected to the upper end of the processing container or the solution discharge port.

  According to one aspect of the present invention, there is provided a sludge recovery device that can efficiently recover sludge containing cemented carbide from waste liquid.

The partial cross section side view of the sludge collection | recovery apparatus which concerns on embodiment. The operation | movement flowchart in the sludge collection | recovery apparatus of embodiment. Operation | movement explanatory drawing of the sludge collection | recovery apparatus of embodiment. Operation | movement explanatory drawing of the sludge collection | recovery apparatus of embodiment. Operation | movement explanatory drawing of the sludge collection | recovery apparatus of embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. The scope of the present invention is not limited to the following embodiment, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, the actual structure may be different from the scale and number of each structure.

  In the following drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction (vertical direction) shown in FIG. The X-axis direction is a direction orthogonal to the Z-axis. The Y-axis direction is a direction orthogonal to the Z-axis and the Y-axis.

(Sludge collection device)
FIG. 1 is a partial cross-sectional side view of a sludge recovery apparatus according to an embodiment.
The sludge recovery device 100 includes a processing device 10, a support base 30 that supports the processing device 10, and a control device 50 that comprehensively controls the sludge recovery device 100.

<Processing device>
The processing apparatus 10 includes a plate-shaped support plate 14, a cylindrical processing container 11 installed upright on the support plate 14, a top wall portion 12 that closes an upper side (+ Z side) of the processing container 11, And a recovery lid 15 provided on the lower surface (-Z side surface) of the support plate 14 to open and close the processing container 11 downward.
In this specification, “radial direction”, “axial direction”, and “circumferential direction” are the radial direction of the cylindrical processing container 11, the direction along the central axis of the processing container 11, and the processing container, unless otherwise specified. 11 means the direction around the central axis.

  A flange portion 13 that protrudes radially outward is provided at the lower opening end of the processing container 11. The flange portion 13 and the support plate 14 are fastened with bolts. The support plate 14 is provided with a circular opening 14 a having a diameter equivalent to that of the processing container 11 at a position where the processing container 11 is attached. The inside of the processing container 11 is opened downward through the opening 14 a of the support plate 14.

  The collection lid 15 is a disk-shaped member having a larger diameter than the opening 14 a of the support plate 14. The collection lid 15 is connected to the support plate 14 via a hinge 26. The collection lid 15 swings around the axis of the hinge 26 to open and close the opening 14 a (the lower opening of the processing container 11) of the support plate 14. In the case of this embodiment, the drive device 54 is connected to the hinge 26. The operation of the driving device 54 is controlled by the control device 50. Therefore, the recovery lid 15 can be opened and closed under the control of the control device 50.

  A seal member 14b such as an O-ring is provided around the opening 14a on the lower surface of the support plate 14. The support plate 14 is provided with a swing clamp 27 that fixes the collection lid 15 in the “closed position” (position covering the opening 14a). By disposing the collection lid 15 at the “closed position” and fixing it with the swing clamp 27, the inside of the processing container 11 can be sealed. In the present embodiment, the swing clamp 27 is controlled by the control device 50. A plurality of swing clamps 27 can be provided according to the load applied to the collection lid 15.

  In the vicinity of the lower end of the peripheral wall of the processing container 11, a solution supply port 16 that supplies a sludge-containing solution to be processed (grinding water after being used for grinding) into the processing container 11 is provided. A solution discharge port 17 for discharging the sludge-containing solution from the processing container 11 is provided in the vicinity of the upper end of the peripheral wall of the processing container 11. The solution supply port 16 and the solution discharge port 17 include a through hole that penetrates the peripheral wall of the processing container 11.

  The solution supply port 16 can be provided at any position as long as it is below the solution discharge port 17, and the solution discharge port 17 can be provided at any position as long as it is above the solution supply port 16. . In order to efficiently adsorb sludge on the magnetic adsorption member 21, the solution supply port 16 may be provided near the lower end of the magnetic adsorption member 21, and the solution discharge port 17 may be provided near the upper end of the magnetic adsorption member 21. The solution supply port 16 may be provided in the recovery lid 15. The solution discharge port 17 may be provided in the top wall portion 12.

  A solution tank 110 and a liquid feed pump 55 are connected to the solution supply port 16 via a three-way valve 51. The three-way valve 51 switches connection of the liquid feed pump 55 or the solution tank 110 to the solution supply port 16. The operation of the three-way valve 51 is controlled by the control device 50.

  When the solution supply port 16 and the liquid feed pump 55 are connected by the three-way valve 51, the sludge containing solution is supplied from the solution tank 110 to the processing container 11 by the liquid feed pump 55. When the solution supply port 16 and the solution tank 110 are connected by the three-way valve 51, the sludge-containing solution in the processing container 11 is discharged to the solution tank 110.

  A drain tank 120 and a gas source 130 are connected to the solution discharge port 17 via a three-way valve 52. The three-way valve 52 switches the connection of the drain tank 120 or the gas source 130 to the solution discharge port 17. The operation of the three-way valve 52 is controlled by the control device 50.

When the solution outlet 17 and the drain tank 120 are connected by the three-way valve 52, the treated sludge-containing solution discharged from the processing container 11 is discharged to the drain tank 120. When the solution outlet 17 and the gas source 130 are connected by the three-way valve 52, the gas supplied from the gas source 130 is supplied into the processing container 11. As the gas supplied from the gas source 130, air or an inert gas (nitrogen, argon, or the like) can be used. The gas source 130 may be the atmosphere.
Instead of the three-way valve 52, a valve (for example, an air release valve) that connects the gas source 130 to a pipe that connects the solution discharge port 17 and the drain tank 120 may be used.

  A plurality (two in the drawing) of columnar magnetic adsorption members 21 extending downward from the lower surface of the top wall portion 12 are provided inside the processing container 11. In the case of this embodiment, the magnetic adsorption member 21 is a rod-shaped member in which a neodymium magnet (permanent magnet) is accommodated in a cylindrical pipe made of a nonmagnetic material. As the magnetic adsorption member 21, a neodymium magnet formed in a rod shape may be used. An electromagnet can also be used as the magnetic adsorption member 21. As the magnetic adsorption member 21 for adsorbing cemented carbide sludge, one having a maximum surface magnetic flux density of 0.8 T or more is preferably used.

  A tip component 22 made of a nonmagnetic material such as resin is attached to the lower end of the magnetic adsorption member 21. The tip part 22 is a member in which a cylindrical part 22a and a conical part 22b are combined. The cylindrical portion 22 a has a diameter equivalent to that of the magnetic adsorption member 21. The conical portion 22b is a portion in which one end portion of the cylindrical portion 22a is formed in a tapered shape. In the tip part 22, the cylindrical part 22a and the conical part 22b are arranged coaxially. The tip component 22 is attached to the magnetic adsorption member 21 with the tip of the conical portion 22b facing downward.

  A scraper (sludge scraping member) 20 that slides in the vertical direction on the surface of the magnetic adsorption member 21 is attached to the plurality of magnetic adsorption members 21. In the case of this embodiment, six magnetic adsorption members 21 are installed and arranged at equal intervals in the circumferential direction of the cylindrical processing container 11. The scraper 20 has a disk shape in plan view and has a plurality of through holes penetrating in the thickness direction. Each of the plurality of six magnetic adsorption members 21 is inserted into these through holes.

  The scraper 20 moves up and down in a state where the six magnetic adsorption members 21 are bundled. In the present embodiment, a drive device 53 is connected to the scraper 20. The operation of the driving device 53 is controlled by the control device 50. Therefore, the scraper 20 can move up and down under the control of the control device 50.

<Support stand>
The support base 30 includes a plate-shaped base 31, a plurality of support columns 32 extending upward from the outer peripheral end of the upper surface of the base 31, and a plurality of wheels 34 attached to the lower surface of the base 31. The support base 30 supports the processing apparatus 10 by fixing the upper end of the support column 32 to the lower surface of the support plate 14.

  A collection container 40 such as a pail can that collects sludge discharged from the processing container 11 is placed on the upper surface of the base 31. The support table 30 is provided with a fence-like container guide member 36 for guiding the collection container 40 to a predetermined position. The collection container 40 is installed vertically below the processing container 11 by the container guide member 36.

(Sludge collection operation)
Next, the sludge collection | recovery operation | movement used with the sludge collection | recovery apparatus 100 provided with the said structure is demonstrated.
FIG. 2 is an operation flowchart in the sludge recovery apparatus of the embodiment. 3-5 is operation | movement explanatory drawing of the sludge collection | recovery apparatus 100 in a predetermined process.

In the sludge collecting operation by the sludge collecting device 100, the control device 50 executes Step ST1 to Step ST8 shown in FIG.
First, in step ST1, the control device 50 causes the drive device 54 to move the collection lid 15 to the “closed position” (position where the opening 14a of the support plate 14 is closed). Further, the control device 50 drives the swing clamp 27 and presses and fixes the collection lid 15 by the swing clamp 27. The processing container 11 is sealed by the above operation.
Next, in step ST <b> 2, the control device 50 causes the drive device 53 to move the scraper 20 to the origin position of the upper end portion of the magnetic adsorption member 21.

  Next, in step ST3, as shown in FIG. 3, the control device 50 switches the three-way valve 51 to connect the solution supply port 16 and the liquid feed pump 55, switches the three-way valve 52, and connects the solution discharge port 17 to the solution discharge port 17. The drain tank 120 is connected. Thereafter, the controller 50 drives the liquid feed pump 55 to pump the sludge-containing solution from the solution tank 110 to the processing container 11.

  Next, in step ST <b> 4, the sludge-containing solution flows from the solution supply port 16 to the solution discharge port 17 through the processing container 11. In this step, the sludge-containing solution flows while being in contact with the magnetic adsorption member 21, whereby the sludge contained in the sludge-containing solution is adsorbed on the magnetic adsorption member 21.

  In the sludge recovery apparatus 100 of this embodiment, as shown in FIG. 3, the sludge-containing solution E supplied from the lower part of the processing container 11 forms a spiral flow (vortex flow VF) along the inner wall of the processing container 11. Then, it circulates toward the solution outlet 17 at the top of the processing container 11.

  The cemented carbide constituting the sludge is a composite material in which carbides of IVa, Va, and VIa group metals such as tungsten carbide are sintered with an iron-based metal such as iron, cobalt, and nickel. Therefore, the sludge to be collected has a higher specific gravity than impurities such as organic substances and metal oxides, and exhibits magnetism by containing about 5 to 20% by mass of a magnetic material such as iron, cobalt, and nickel. Since the cemented carbide sludge is a heavy particle in the vortex VF, it moves to the inside of the vortex, is separated from impurities, and stays in the processing vessel 11. The staying sludge is attracted to the magnetic attracting member 21 by its magnetism.

  In addition, sludge with a large specific gravity is likely to settle at the lower part of the processing container 11. Therefore, in the sludge recovery apparatus 100 of the present embodiment, the eddy current VF is formed so that the sludge containing solution E rises from the lower part to the upper part of the processing container 11 and the sludge is wound upward. Thereby, it can suppress that sludge settles in the bottom part of the processing container 11. FIG.

The sludge adsorption step of step ST4 is executed continuously or intermittently for a predetermined period. The predetermined period may be, for example, a preset operation time or a period in which a predetermined amount of the sludge-containing solution E is circulated in the processing container 11.
In step ST4, the solution discharged from the solution discharge port 17 can be re-supplied from the solution supply port 16 to the processing container 11, and the sludge-containing solution E can be circulated in the processing apparatus 10.

Next, in step ST5, the control device 50 stops the liquid feed pump 55.
Next, in step ST6, the control device 50 switches the three-way valve 51 to connect the solution supply port 16 and the solution tank 110 as shown in FIG. The control device 50 switches the three-way valve 52 to connect the solution discharge port 17 and the gas source 130. As a result, gas (air or the like) flows from the gas source 130 through the solution discharge port 17, and the sludge-containing solution E in the process vessel 11 is discharged from the solution supply port 16 to the solution tank 110. At this time, the sludge-containing solution E can be quickly discharged from the processing container 11 by supplying gas from the gas source 130 and pushing down the liquid level with the gas pressure. If the sludge containing solution E is discharged | emitted from the processing container 11, it will transfer to step ST7.

  Next, in step ST7, the control device 50 drives the swing clamp 27 to release the recovery lid 15 as shown in FIG. Thereafter, the control device 50 drives the drive device 54 to rotate the collection lid 15 to open the processing container 11 downward.

  Next, in step ST8, the control device 50 drives the drive device 53 to push down the scraper 20 downward. The scraper 20 moves downward while sliding on the surface of the magnetic adsorption member 21 and pushes down the sludge SL adsorbed on the surface of the magnetic adsorption member 21 while scraping it off. Since the tip part 22 made of a nonmagnetic material is attached to the lower end of the magnetic adsorption member 21, the sludge SL pushed down by the scraper 20 falls downward from the surface of the tip part 22. The dropped sludge SL is collected in a collection container 40 installed immediately below the processing container 11. In the case of the present embodiment, since the tip part 22 is tapered toward the bottom, the sludge SL is easily detached from the tip part 22.

  Through the above operation, the sludge recovery device 100 can selectively recover the cemented carbide sludge SL from the sludge-containing solution E.

  As described above in detail, according to the sludge recovery apparatus 100 of the present embodiment, the vortex VF of the sludge-containing solution E is formed in the processing container 11, and the sludge SL is separated while separating the sludge SL in the processing container 11. The sludge SL can be adsorbed on the adsorbing member 21. Thereby, sludge SL with few impurities can be efficiently recovered.

  In addition, although this embodiment demonstrated the case where the sludge containing a cemented carbide was collect | recovered from the sludge containing solution produced in the manufacturing process of a cemented carbide tool, it is not limited to this aspect. Any sludge containing a magnetic material such as high-speed tool steel can be recovered without any problem. Further, the origin of sludge is not limited to that generated by grinding, and sludge generated in any process can be collected.

  DESCRIPTION OF SYMBOLS 11 ... Processing container, 15 ... Recovery lid, 16 ... Solution supply port, 17 ... Solution discharge port, 21 ... Magnetic adsorption member, 100 ... Sludge collection device, 20 ... Scraper (sludge scraping member), SL ... Sludge

Claims (8)

An apparatus for recovering the sludge from a solution containing sludge containing a magnetic material,
A cylindrical processing vessel for circulating the solution therein;
A rod-shaped magnetic adsorption member disposed in the processing container and extending along the axial direction of the processing container;
A solution supply port provided on one side in the axial direction of the processing container;
A solution outlet provided on the other side in the axial direction,
Causing the solution supplied from the solution supply port to circulate in a spiral around the axis inside the processing container to adsorb the sludge to the magnetic adsorption member;
Sludge collection device.   The processing container is disposed in an axially upright state, the solution supply port is provided on a lower side of the side surface of the processing container, and the solution discharge port is provided on an upper side of the side surface of the processing container. The sludge collection apparatus according to 1. A recovery lid that opens and closes the bottom of the processing container below the magnetic adsorption member;
A sludge scraping member provided slidably on the surface of the magnetic adsorption member in the longitudinal direction;
The sludge collection device according to claim 2, comprising:   The sludge collection device according to claim 3, wherein a nonmagnetic member that is tapered downward is provided at a lower end portion of the magnetic adsorption member.   The sludge collection device according to any one of claims 1 to 4, wherein a plurality of the magnetic adsorption members are arranged around an axis of the processing container.   The sludge recovery apparatus according to any one of claims 1 to 5, wherein the magnetic adsorption member has a maximum surface magnetic flux density of 0.8 T or more.   The sludge collection device according to any one of claims 2 to 6, wherein an air release valve is connected to an upper end portion of the processing container or the solution discharge port.   The sludge recovery apparatus according to any one of claims 1 to 7, wherein the sludge includes cemented carbide or high-speed tool steel.

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