JP2008280615A - Recovery ship and recovery method for recovering metal from seawater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient recovery method for recovering an apparatus for collecting metals from seawater and a recovery ship which facilitate collection of materials moored in seawater. <P>SOLUTION: The recovery ship for recovering collecting materials for collecting metals from seawater is a recovery ship for recovering a collecting apparatus 10 for collecting metals from seawater. The collecting apparatus 10 has constitution in which one ends of a plurality of metal collecting materials 13 having buoyancy are detachably connected to a chain 11, at both ends of the chain 11, pressure-resistant buoys 12 are connected to the middle of chain-hoisting prefetching ropes 15 through underwater detaching devices 16 and are floated in sea, and when wires 18 are detached, the chain-hoisting prefetching ropes 15 extend to allow the buoys 12 to float up toward the sea surface. The recovery ship is equipped with: a prefetching rope spooling winch 38 for hoisting the chain-hoisting prefetching ropes 15; a chain hoisting machine 36 for hoisting the chain 11; a chain lowering machine 37 for lowering the chain 11; and a ship's hold which can receive, at least, collecting material storage drums 32 in the number sufficient to take up the metal collecting materials 13 in the number corresponding to the number of the metal collecting materials 13 recovered by a single operation, added with a margin. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mooring method and a collecting method for a trapping material introduced into the sea for recovery of metals in seawater, and more particularly to a mooring / collecting system for a trapping material used for recovering uranium in the sea.

About 70% of elements are dissolved in seawater, and various useful rare metals are contained in large quantities. If rare metals in seawater can be recovered efficiently, it is equivalent to possessing an excellent rare metal mine.
As for uranium, the total amount of seawater contains an enormous amount of about 4.5 billion tons, which is 1000 times that of uranium consumed in a year at nuclear power plants around the world. Even in the waters near Japan, the amount of uranium transported by the Kuroshio current is about 5.2 million tons per year, which is roughly equivalent to the economically recoverable reserves of land uranium.
One possibility of a long-term stable supply method of energy is the development of recovery technology for uranium resources dissolved in seawater.

  Conventionally, a method of collecting harmful or useful metals in seawater by applying a radiation graft polymerization method to a non-woven fabric and introducing a functional group having a metal collecting ability by performing a chemical reaction has been developed. As the functional group having metal collecting ability, an amidoxime group, an imidodiacetic acid group, a sulfonic acid group, a phosphoric acid group, a 2-pyrrolidone group, or the like is used. In order to collect the metal in the liquid, a material in which a spacer is inserted between the non-woven cloth collecting materials is laminated and used, but the contact between the liquid and the collecting material is not efficient.

On the other hand, Patent Document 1 discloses a method for collecting a metal by collecting a collection material based on a mole-shaped polymer synthetic fiber directly into water and collecting it after the lapse of time. .
The disclosed trapping material is formed by molding a thick twist of polymer synthetic fiber yarns such as polyethylene and polypropylene, and then forming them in the shape of a mold around the core. It is produced by irradiating ~ 200 kGy, grafting a polymerizable monomer onto the irradiated fiber base to form a graft side chain, and further introducing a chelate group into the graft side chain.

Acrylonitrile, methacrylic acid, glycidyl methacrylate, acrylic acid, sodium styrenesulfonate, or a mixture thereof is used as the polymerizable monomer that is graft-polymerized on the polymer synthetic fiber substrate.
The collecting material of the present disclosure can be formed to have an arbitrary length, and can collect the metal in the water only by fixing one end or both ends and leaving it to stand.

  According to the disclosed examples, the synthetic synthetic fiber material is irradiated with an electron beam, then immersed in a mixed solution of acrylonitrile and methacrylic acid to cause a graft reaction, and further in a 3% hydroxylamine hydrochloride water / ethanol solution. To obtain a metal trapping material having an adoxime group of 4 to 5 mmol / g, and when the trapping material was immersed in seawater to collect uranium, 1g of each collected material was collected. In addition, the theoretical collection amount of uranium is about 10 g with respect to 1 kg of the disclosed collection material.

Thus, for uranium, the adsorbent having an amidoxime group has extremely high adsorption performance. At present, there is a recovery record of up to 1.5 g of uranium with respect to 1 kg of collected material. Is expected to improve performance up to about 4g or 6g.
As a method of collecting metal in seawater using such a collector, for example, a large amount of seawater pumped up is applied to the collector, or the collector is placed in a basket and moored in seawater. A method of contacting with a large amount of seawater can be considered.

However, the nuclear fuel for one nuclear power plant is about 200 tons per year, and even if it is collected six times a year, it requires 20,000 tons of collecting material. Therefore, if the demand of a large number of nuclear power plants is to be satisfied, the pump capacity and the mechanism for suspending the kite become excessive and impractical.
Also, in shallow water, marine organisms may adhere to the collection material, and the removal process may be costly. Floating collection material may interfere with the vessel that navigates and may be damaged or hinder navigation. There is.

Patent Document 2 discloses a method for mooring a trapping material in seawater. In the disclosed method, braided bottoms with built-in weights and braided floating parts with built-in floats are alternately arranged, and a number of traps made of metal adsorbents in seawater are provided in the floating parts. The floating part is lifted up to make the trapping material drift in the seawater.
If the collecting material is floated at a depth deeper than 40 m according to the present disclosure, marine organisms can be prevented from adhering to the ship without impeding vessel navigation and not receiving sunlight.

In the disclosed method, the bottoming portion and the floating portion are connected in series to form a single rope, so that it can be easily wound up using a fishing net winding device or the like. However, when the trapping material is separated and uranium is eluted and recovered by chemical treatment and then re-entered into the sea, it is necessary to reconnect the divided bottom portion and the floating portion. In addition, since it is difficult to control the position of the landing bottom on the seabed, when a large number of collecting devices are thrown in, the mutual interval should be sufficiently large so that even if some deviation occurs, interference does not occur. There is a need.
JP 2002-045708 A JP 2002-11981 A

  The problem to be solved by the present invention is to provide an efficient recovery method of a seawater metal trapping device in which the trapping material moored in seawater can be easily recovered.

In order to solve the above-mentioned problem, the seawater metal collection material recovery ship of the present invention is a set of a predetermined number of connecting devices for connecting the collection material to a chain provided with floats at both ends, with a predetermined interval, Floats are connected to the chain with a pressure hoisting buoy for the chain hoisting, and further suspended in the sea by stopping the chain hoisting in the middle of the chain hoisting via an underwater separable device that can be operated from the sea. When the chain is cut off, the chain hoisting rope extends and the pressure-resistant buoy floats toward the sea surface and floats on the sea surface or below the sea surface. A number of metals with a margin added to a pre-loading swivel winch that winds up the hoisting hoist, a chain hoist that winds up the chain, a chain unwinder that unwinds the chain, and a metal collector that is recovered in a single operation Winding the collecting material Characterized in that it comprises a hold can hold adsorbent storage drum capable Rukoto.
An anchor weight for fixing the chain to the seabed may be provided at the end of the chain.

  The metal-collecting material is a polymer synthetic fiber yarn knitted radially around the core and formed into a mole shape. The polymer synthetic fiber yarn has a metal-capturing ability in a graft group subjected to radiation graft polymerization. Functional groups have been introduced. Further, one end of the core is provided with a coupling mechanism such as a quick coupling that couples with the tying device. The trapping material has buoyancy and extends upward from the bottom chain to drift into the seawater. In addition, the float for increasing buoyancy may be prepared in the core.

The underwater metal collector recovery vessel moored and recovered the underwater metal collector. The recovery vessel is equipped with a chain hoist and chain unwinder on the side, and has a space for storing the collection material storage drum on the deck, and the same number of new collection materials as the collection material collected in one operation. It is operated to the position where the metal collecting device in the seawater is arranged with the collecting material storage drum wound with the collecting material and some empty collecting material storage drums.
After the collected material for one seawater metal collecting device is collected, the collected material storage drum wrapped with the collected collected material and some empty collected material storage drum are mounted on the recovery ship. Yes.

When collecting the collected material, issue a disconnection command signal to the underwater disconnecting device of the target seawater metal collector, and when the separated pressure buoy emerges, scoop it up and walk the tip of the chain. Hang the chain on the chain hoist and chain unwinder, and while lifting the chain, remove the collected material that has been lifted one by one, transfer it to an empty collection material storage drum, collect it, and wind up the new material Attach a new collecting material of the collecting material storage drum and drop it continuously with a chain unwinding machine.
During this time, the recovery vessel is navigating at the speed of pulling up in the direction in which the seawater metal collector is laid.

When dropping the tip of the chain, the underwater separation device and the pressure-resistant buoy are returned to the original state, and the anchor is attached to the end of the chain to determine the position on the seabed.
The other end of the chain has a float that has not been separated by the underwater separation device, so the anchor weight is positioned as it is and dropped into the sea.
If the chain is sufficiently heavy, it can be laid at a desired position directly below the recovery vessel without attaching an anchor weight.

According to such a collection mooring method, the collection material can be continuously collected and dropped, and high-speed processing is possible.
In addition, it is preferable that the number of collection materials connected to the chain is a quantity that can be collected by the collection ship in one day of work.
Moreover, the seawater metal collection device is moored at a position that is separated from the seabed position before the recovery by a distance of about twice the water depth. That is, if the water depth is 100 m, it is about 200 m, and if the water depth is 200 m, it is shifted about 400 m forward.

Hereinafter, the mooring / recovering method of the seawater metal trapping material of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual configuration diagram of a seawater metal collecting device, FIG. 2 is a mooring conceptual diagram of a collection material, and FIG. 3 is a perspective view illustrating an arrangement example of a part of the seawater metal collecting device on the seabed. 4 is a layout diagram on the deck of the recovery ship, FIG. 5 is a front view and a cross-sectional view showing an example of the collection material storage drum, and FIGS. 6 to 8 are diagrams for explaining the collection material collection procedure.

As shown in FIG. 1, the seawater metal collecting device 10 of the present embodiment is substantially equivalent via a knotting device 14 such as a quick coupling that can be easily detached and attached to a chain 11 having pressure-resistant buoys 12 attached to both ends. A large number of metal collectors 13 are attached at intervals.
The pressure-resistant buoy 12 is connected to the end of the chain 11 by a chain hoisting advance line 15, and is further placed in the middle of the advance line 15 by a wire 18 connecting an underwater separating device 16 and a preliminary underwater separating device 17 in the middle. It is connected. The underwater separation device 16 can disconnect the wire 18 by remote operation by an ultrasonic command signal radiated from a recovery ship at sea. The spare underwater separation device 17 is a backup device that backs up when a problem occurs in the underwater separation device 16.
Further, the pressure buoy 12 is provided with a drum 19 that winds up the slack of the leading line 15. Note that weights 20 may be attached to both ends of the chain.

The collection material 13 of this example is a material in which polyethylene fibers are radiation-grafted and an amidoxime group, which is a chelate group that binds well to uranium, is introduced into the graft group for the purpose of collecting uranium. This is a molding collector made by twisting a large number of fiber yarns 22 that are radially amidoxime-based.
As shown in FIG. 2, a coupling mechanism is provided at one end of the collecting material 13, and the coupling mechanism is engaged with a cabling device 14 provided on the chain 11, and is submerged on the seabed by the weight of the chain 11. Since the specific gravity of the trapping material 13 is smaller than that of seawater, it extends upward and drifts in the seawater. When uranium in the seawater contacts the amidoxime group, it is fixed to the amidoxime group and captured. In addition, when the buoyancy of the collection material 13 is insufficient, the buoyancy can be increased by charging the buoyancy 23 in the core 21 of the collection material 13.

It is preferable that the coupling mechanism between the knotting device 14 and the trapping material 13 coupled thereto is configured as a quick coupling that can be easily attached and detached in a short time.
If the collection material 13 is shallow, it will be damaged by contact with the navigating ship, or organisms in the seawater will adhere to the collection material 13 and the removal process will take time and cost. It is preferable to install it so that it is larger than the draft and is located at a depth of 40 m or less where sunlight does not reach and there is little adhesion of marine life.

It should be noted that the length and thickness of the collecting material 13, the quantity and the mounting interval of the collecting material 13, and the length of the chain 11 are determined in consideration of the uranium recovery rate and recovery amount, the capacity of the recovery vessel, and the like. In this embodiment, assuming that 1 kg of amidoxime-based fiber is used per 1 m of the mall-shaped collection material 13, the length of the collection material 13 is 60 m and the interval is 8 m. The book collector 3 was used.
When using such a collection device, it will be installed on the seabed at a depth of 100 m or more.

The seawater metal collection device 10 of the present embodiment is arranged in a matrix on a flat seabed, for example, as shown in part in FIG. In addition, it is known that the amount of uranium collected increases as the seawater temperature increases and in proportion to the sea flow velocity. Therefore, select a sea area that satisfies these conditions and install a metal collector in seawater. It is preferable.
The length of one chain 11 is long enough to connect as many collection members 13 as the number of collection vessels to be collected and moored in a day's work, and pressure-resistant buoys 12 are attached to both ends thereof.
A predetermined number of chains 11 are arranged in series, and one collection ship is in charge of each row, and when the number of days from when one chain 11 is dropped until collection is over, I want to be able to collect and drop the chain 11. For this reason, for example, when the number of days until recovery is 60 days, 32 seawater metal collection devices 10 are arranged in one row in consideration of the availability.

Since there is a difference between the recovery position and the mooring position of the seawater metal collection device 10 according to the depth of laying, the distance between the seawater metal collection devices 10 arranged in series is, for example, 100 m to a sea depth of 200 m. For example, a certain interval according to the sea depth should be opened.
Further, the interval between the chain rows is 70 m so that the trapping material 13 does not become an underlay or entanglement of the chain 11 even if the trapping material 13 of the adjacent row is tilted. I opened it to a certain extent.
If 240 pieces of 60m, 60kg collection material 13 are attached to the underwater metal collection device 10, and if the collection material stays in the sea for 60 days and is collected six times a year, it will be 1200 tons of metal uranium per year. In order to collect the above, a trial calculation result has been obtained that 218 rows of 32 seawater metal collecting devices 10 arranged in a row are sufficient.

The recovery ship reciprocates between the sea area where the seawater metal collection device is laid and the port where the plant that treats the collection material and elutes the metal, and collects the collected material after collecting the metal. Work to collect and supply new collection material.
As can be seen from the arrangement on the deck shown in FIG. 4, the recovery vessel 31 is a dropped collection material hold 33 for storing a collection material storage drum 32 equipped with a new collection material as shown in FIG. 5; There is provided a collection material collection ship 35 for storing the collection material storage drum 32 that has wound the collected collection material. The collecting material storage drum 32 has a rotary drum diameter of approximately 2.5 m and is designed to wind up the collecting material 13 one by one.

  In addition, a chain hoisting machine 36, a chain unwinding machine 37, and a pre-winding and winding winch 38 are juxtaposed on at least one ridge side, and a crane 39 that handles the pressure-resistant buoy 12 is installed. Further, on this side, a collection material temporary winding drum 40 used for temporarily winding the collection material and transferring it to the collection material storage drum 32, and a chain for dropping the chain end to a designated position in the sea. A dropping winch 41 is also provided.

6, FIG. 7, and FIG. 8 are drawings for explaining the collection and mooring procedure of the metal trapping material in the present embodiment.
FIG. 6 is a drawing for explaining the first part of the recovery process of the seawater metal collecting device laid on the seabed.
At the tip of the chain 11 of the seawater metal collecting device 10, a pressure-resistant underwater buoy 12, an underwater separation device 16, a preliminary underwater separation device 17, and a chain hoisting tip 15 are attached. 12 stands underwater.

FIG. 6 (1) is a drawing showing the first step of collecting the collected material.
When the recovery ship 31 reaches the sea level on the end of the target underwater metal collection device 10 and is ready for recovery, the recovery ship 31 transmits a disconnection command signal to the underwater disconnection device 16. When the underwater separation device 16 receives the separation command signal, the underwater separation device 16 releases the wire 18 that is coupled to the chain hoisting front cable 15.
If disconnection of the wire 18 is unsuccessful, the recovery of the seawater metal collecting device 10 becomes extremely difficult, for example, a deep sea operation using a submersible or a diver is required. When the underwater separation device 16 does not operate, the preliminary underwater separation device 17 is operated by another command signal so that the wire 18 can be reliably disconnected.

FIG. 6 (2) is a drawing showing a process of picking up the underwater buoy 12.
When the wire 18 is cut off by the underwater separating device 16, the underwater buoy 12 is lifted by pulling the chain hoisting advance line 15. At this time, the pre-take-up take-up drum 19 that winds up the pre-take 15 is loosened and the pre-take 15 is fed out, so that the underwater buoy 12 floats on the sea surface. Needless to say, even if the underwater buoy 12 does not appear on the surface of the sea, such as when the first search 15 is short, the position of the sonar provided in the recovery ship 31 can be easily known.

FIG. 6 (3) is a drawing showing a step of lifting the pre-taken line 15.
The underwater buoy 12 is pulled up onto the recovery ship 31 using the crane 39. A chain hoisting rope 15 connected to the underwater buoy 12 is hung on a chain hoisting machine 36 and a chain unwinding machine 37 and is pulled up by a pretaker winding winch 38. The chain hoisting advance 15 is formed of a light and durable nylon rope.
When the advance line 15 is wound up, the chain 11 is lifted by the advance line 15. Note that while the chain 11 is being lifted, the recovery ship 31 moves forward in synchronization with the speed at which the chain 11 is lifted in the laying direction of the chain 11.
The pulled-up underwater separating device 16 and the preliminary underwater separating device 17 are replenished with a power source, and the leading-in take-up take-up drum 19 is wound up.

FIG. 6 (4) is a drawing showing a process of attaching the underwater buoy 12 to the start of the chain 11 and throwing it into the sea.
When the chain portion 11 at the end is caught on the chain winder 36 and the chain unwinder 37 and does not return in the reverse direction, the underwater buoy 12, the pre-winding take-up drum 19, the underwater separating device 16, The underwater separation device 17, the wire 18 connecting them, the chain hoisting rope 15, etc. are returned to the same state as when they are on the seabed and are put into the sea.
As the tip of the chain 11 sinks, the underwater buoy 12 also sinks. When the tip of the chain lands on the seabed, the underwater buoy 12 rises into the water in the same state as before being pulled up, and the starting point of the underwater metal collecting device 10 is set.

FIG. 7 is a drawing showing a process of exchanging the collecting material on the recovery ship.
The trapping material 42 that has sufficiently absorbed metal in the seawater such as uranium rises as the chain 11 is pulled up by the chain hoist 36 in accordance with the progress of the recovery vessel 31. 11 is taken up on the collecting material temporary take-up drum 40, transferred to the collecting material storage drum 32, and stored in the collecting material collection hold 35. At least two collecting material temporary winding drums 40 are provided to perform winding and rewinding in turn and efficiently collect the collecting material 13 that is raised one after another.
The trapping material storage drum 32 emptied by supplying the trapping material 13 to the chain 11 is moved to the trapping material collection hold 35 and used to wind up the trapping material 13 that has absorbed uranium. . Therefore, the collection material storage drum 32 is sufficient if there is a quantity obtained by adding a slight margin to the number of collection materials attached to the single seawater metal collection device 10.

The chain 11 is connected to the new collection material 13 supplied from the collection material storage drum 32 by the knotting device 14 and then lowered to a new mooring position on the seabed by the chain unwinder 37 to newly absorb uranium. It becomes the collection material 43.
The chain 11 is pulled up from the bottom of the sea to the recovery vessel 31, and the trapping material 13 is replaced and submerged again. However, in order to prevent the chain 11 laid on the bottom of the sea from being dragged, It is required to be lifted almost vertically and lowered almost vertically. Therefore, it is shifted forward by a distance of about twice the sea depth with respect to the position where the seawater metal collecting device 10 was laid before the recovery. For example, when there is a water depth of 100 m, it will be shifted by 200 m.

FIG. 8 is a diagram for explaining a procedure for dropping the end of the chain.
When the chain hoist 36 is used to wind the chain 11 until the final end of the chain 11 is lifted to the recovery vessel 31, the underwater buoy 12 and the leading rake 15 are also raised together.
Since the underwater buoy 12, the underwater separation device 16, the preliminary underwater separation device 17, and the pre-winding take-up drum 19 coupled to the end of the chain 11 are pulled up to the recovery ship 31 in the same state as when they were underwater, If the power of the underwater separation device is replenished, it can be dropped and installed on the seabed. However, after the recovery ship 31 is removed from the chain unwinder 37, there is no restriction, so if it is allowed to fall freely, it will descend to an arbitrary place.

Therefore, in this embodiment, the end of the chain 11 is fixed to the eye plate on the ship through the steel cord 44 of the chain dropping winch 41 and the tension is applied to the steel cord 44 before the chain 11 is detached from the chain unwinder 37. Is applied to alleviate the impact when the chain 11 is dropped, and after the chain 11 is submerged in the sea, the steel cord 44 is extended to gradually lower the chain 11 to the bottom of the sea.
When the end of the chain 11 reaches the seabed, one end of the steel cable 44 is removed from the eyeplate on the ship and the chain dropping winch 41 is wound up, and the steel cable 44 is removed from the connecting fitting at the end of the chain 11 and collected on the ship. .
By such a method, it can be laid linearly on the sea floor up to the end of the chain 11.
In addition, the weight 20 may be fixed to the end of the chain 11 so that the laying position by the steel cord 44 can be specified accurately.

In the above embodiment, the collecting material is wound around a drum and stored. However, a method of stacking the material in the hold or a method of hanging it in the hold can be used.
In addition, the collected material is processed at an onshore plant, but the mother ship equipped with the treatment plant is stationed in the vicinity of the area where the underwater metal collector is installed, and the collected material is collected from the recovery vessel. Then, uranium recovery processing and collection material recovery processing may be performed. If the mother ship method is adopted, the ratio of the time during which the recovery ship can work on site increases, and the work efficiency can be improved.

It is a notional block diagram of the seawater metal collecting device concerning one example of the present invention. It is a mooring conceptual diagram of the collection material in a present Example. It is a perspective view which shows the example of arrangement | positioning about a part of seawater metal collection apparatus in the seabed in a present Example. It is an arrangement | positioning figure on the deck of the collection ship in a present Example. It is the front view and sectional drawing which show the example of the collection material storage drum used for a present Example. It is drawing explaining the first part of the collection material collection | recovery process in a present Example. It is drawing which shows the process of replacing | exchanging collection materials on the collection ship in a present Example. It is drawing explaining the dropping process of the chain end in a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sea underwater metal collecting device 11 Chain 12 Pressure-resistant buoy 13 Metal collecting material 14 Knotting device 15 Chain hoisting advance 16 Underwater separating device 17 Preliminary underwater separating device 18 Wire 19 Leading take-up drum 20 Weight 21 Core 22 Many twisted fiber yarns 23 Floating 31 Collection ship 32 Drum storage drum 33 Dropping collection material hold 35 Collection material collection hold 36 Chain hoist 37 Chain unwinder 38 Pre-loading winch 39 Crane 40 Collecting material temporary winding drum 41 Chain drop winch 42 Collecting material after collecting uranium 43 New collecting material 44 Steel cord

Claims (9)

  A metal collector that adsorbs metal and elutes the metal by a chemical reaction, has a coupling mechanism at one end, and has a buoyancy and extends upward from the seabed chain and drifts in seawater, and the metal A chain in which a predetermined number of connecting devices that are detachably coupled to the coupling mechanism of the collecting material are provided at predetermined intervals, and floating portions are provided at both ends, and the floating portions are chained with pressure buoys. It is connected to the chain with a hoisting rope for the hoisting, and is stopped in the middle of the chain hoisting hoisting via an underwater separating device that can be operated from the sea. In a seawater metal collecting device constituted by a chain in which a pre-taken line is drawn out and the pressure-resistant buoy is levitated toward the sea surface, a pre-take-in swivel winch that winds up the chain take-up pre-taken and the chain Che A hoisting machine, a chain unwinding machine for unwinding the chain, and a collecting material storage drum capable of winding up the same number of metal collecting materials as the metal collecting material collected in one operation A ship for collecting metal-collecting material in seawater provided with a hold capable of storing at least a number of collecting-material storage drums with a margin.   The metal collecting material is formed by molding a polymer synthetic fiber yarn in which a functional group having a metal collecting ability is introduced into a graft group obtained by radiation graft polymerization, and knitting radially around a core to form a molding. The seawater metal collecting material recovery ship according to claim 1, wherein the coupling mechanism is provided at one end of the core.   The seawater metal collection material recovery vessel according to claim 1 or 2, wherein the seawater metal collection device is used to recover uranium in seawater.   It is a method of collect | recovering the said metal collection material in the seawater metal collection material collection | recovery ship in any one of Claim 1 to 3, Comprising: In the said underwater cutting apparatus of the said seawater metal collection apparatus made into object When the cut-off command signal is generated and the separated pressure-resistant buoy rises, the chain is lifted up and passed through the chain hoisting pre-take and the chain that is pulled up by the pre-housing is connected to the chain hoist and the chain hoist. The pressure buoy and the underwater separation device are re-installed at the tip of the chain and dropped into the sea over a chain unwinding machine, and the seawater metal collection material recovery ship is further connected to the seawater metal collection device. The chain is lifted by the chain hoisting machine while being moved along, and the metal collecting material that is lifted is removed one after another, transferred to an empty collecting material storage drum and wound up, and a new metal collecting material is wound up. Dust collector storage dora Metal collecting material collecting method characterized by attaching the vacated a new metal collecting material the lacing device for continuously dropped into the sea in the chain winding disembarkation.   The seawater metal collection device further includes a preliminary underwater separation device, and reaches the sea surface on the end of the seawater metal collection device targeted by the seawater metal collection material recovery ship and prepares for recovery. When the underwater separation device is not activated when the separation command signal is issued to the underwater separation device of the seawater metal collecting device, the preliminary underwater separation device is turned on by another command signal. 5. The metal collecting material recovery method according to claim 4, wherein the wire is surely cut off by operating.   The chain hoisting rope is formed of a nylon rope, the chain hoisting rope is hung on the chain hoisting machine and the chain unwinding machine, and the pressure buoy is pulled up by the prefetching pinching winch. 6. The metal collecting material recovery method according to claim 4 or 5,   When the end of the chain is caught on the chain hoist and the chain unwinder and does not return in the reverse direction, the pressure buoy at the start end of the chain, the underwater separation device, the preliminary underwater separation device, 7. The metal according to any one of claims 4 to 6, wherein the wire for connecting them and the chain hoisting rope are attached in the same state as when the chain is on the seabed, and are inserted into the sea. Collection material collection method.   The seawater metal collection material recovery ship further includes a collection material temporary winding drum, and the chain is pulled up by the chain hoist according to the progress of the seawater metal collection material recovery ship. The fried metal collecting material is removed from the chain at the knotting device, wound around the collecting material temporary winding drum, and then further transferred to the collecting material storage drum to collect the collected material collecting cargo. The metal collection material recovery method according to any one of claims 4 to 7, wherein the metal collection material is stored in a container.   The seawater metal collection material recovery ship further includes a chain drop winch, and the end of the chain drop winch is passed through a steel rope of the chain drop winch to fix the end of the steel rope to an eye plate provided on the ship, Before the chain is detached from the chain unwinder, tension is applied to the steel cable to reduce the impact when the chain is dropped, and after the chain is submerged in the sea, the steel cable is unwound, and the chain is gradually lowered to the seabed, When the end of the chain reaches the seabed, one end of the steel cord is removed from the eye plate and the chain dropping winch is wound up, and the steel cord is detached from the ring at the end of the chain and collected on the ship. The method for recovering a metal collection material according to any one of claims 4 to 8, wherein:

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