A deep-sea polymetallic nodule and rare earth co-collection device and a collection method

Abstract

This invention discloses a device and method for co-collecting polymetallic nodules and rare earth elements in deep sea. The collection device includes a mining vehicle, a mineral collection device mounted on the mining vehicle, and an underwater robot. The mining vehicle is equipped with a solidification liquid tank for loading a solidification solution for the soft, rare earth substrate. The solidification liquid tank is connected to the underwater robot, which is equipped with a spraying device for spraying the solidification solution onto the coexisting area of ​​polymetallic nodules and rare earth elements. The mineral collection device collects and transports the polymetallic nodules and the solidified rare earth solids into a storage bin within the mining vehicle. This invention utilizes an underwater robot to spray the solidification solution onto the soft, rare earth substrate in the coexisting area, thereby solidifying the soft, rare earth substrate into rare earth solids. This facilitates collection by the mineral collection device, prevents the flow and dispersion of the soft, rare earth substrate, reduces disturbance during the collection process, avoids the formation of plumes, and achieves efficient co-collection of polymetallic nodules and rare earth elements.

Description

Technical Field

[0001] This invention relates to the field of marine mineral resource mining technology, specifically to a device and method for the joint collection of deep-sea polymetallic nodules and rare earth elements. Background Technology

[0002] The deep seabed is the largest untapped mineral resource area on Earth. To date, the economically valuable deep-sea mineral resources discovered mainly include: polymetallic nodules containing nickel, copper, cobalt, and manganese; cobalt crusts rich in cobalt, nickel, copper, and manganese; and polymetallic sulfide deposits rich in copper, lead, zinc, gold, and silver; as well as deep-sea rare earth-rich sediments with high rare earth element content (referred to as deep-sea rare earths). Polymetallic nodules and polymetallic sulfides rich in lead, zinc, gold, and silver are mainly found in the seabed surface soil at depths of 5000-6000 meters; deep-sea rare earths are generally found between 3500 and 6000 meters, especially concentrated in deep-sea plains or hilly areas at depths of 4000-5000 meters, with a typical occurrence depth of 0-5 meters. Currently, the extraction methods for these various minerals are relatively independent, but their occurrence states overlap.

[0003] Currently, the mining of deep-sea mineral resources mostly focuses on extracting solid ores such as polymetallic nodules. However, deep-sea rare earth elements (REEs) exist not as solid ores but as mud. When using traditional mining equipment to extract REEs, the jet nozzles disperse and wash away the REE mud, making efficient extraction difficult. Furthermore, the surface sediments stirred up by the jets easily spread, forming plumes that impact the marine environment. If an area contains both polymetallic nodules and deep-sea rare earth elements, existing extraction methods cannot effectively extract both resources simultaneously, resulting in resource waste. Therefore, there is an urgent need for a extraction device and method capable of simultaneously extracting polymetallic nodules and deep-sea rare earth elements to address the potential need for simultaneous extraction of both mineral resources and avoid resource waste. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a device and method for the joint collection of deep-sea polymetallic nodules and rare earth elements.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] A deep-sea polymetallic nodules and rare earth co-collection device includes a mining vehicle body, a mineral collection device installed on the mining vehicle body, and an underwater robot. The underwater robot is equipped with a spraying device for spraying a solidifying liquid of a soft bottom into the area where polymetallic nodules and rare earth coexist. The mineral collection device collects and transports the polymetallic nodules and solidified rare earth solids into the hopper of the mining vehicle body.

[0007] Furthermore, the mineral collection device includes a water jet conveying mechanism and a collection conveying mechanism. The collection conveying mechanism includes a conveyor chain / belt connected to the silo, and the water jet conveying mechanism includes a high-pressure nozzle for lifting and conveying polymetallic nodules and rare earth solids to the input end of the conveyor chain / belt.

[0008] Furthermore, the collection and conveying mechanism includes a conveying roller and a driving component for driving the conveying roller to rotate. The conveying roller is provided with a conveying blade, and the conveying blade is provided with drag-reducing filter holes. The driving component drives the conveying blade to rotate so as to convey the raised polymetallic nodules and rare earth solids to the input end of the conveyor chain / belt.

[0009] Furthermore, one end of the conveying blade is connected to the conveying roller, and the other end is provided with a crushing collection plate for crushing the plated polymetallic nodules and rare earth solids. The crushing collection plate and the conveying blade form a collection trough in the rotational conveying direction of the conveying roller.

[0010] Furthermore, the crushed aggregate plate has a guide slope formed in the rotational conveying direction of the conveying roller, and the high-pressure nozzle lifts the polymetallic nodules and rare earth solids and guides them upward along the guide slope to the inlet of the hopper.

[0011] Furthermore, the water jet conveying mechanism includes a first protective plate and a second protective plate, which are disposed at the front end of the mining vehicle body in the direction of travel. One end of the first protective plate is fixedly hinged to the mining vehicle body, and the other end is fixedly hinged to one end of the second protective plate. The other end of the second protective plate is connected to the high-pressure nozzle.

[0012] Furthermore, the inner wall of the first protective plate, the second protective plate, the conveying roller, and the inlet of the hopper forms a rotating cavity. The spray direction of the high-pressure nozzle is inclined towards the lower side in front of the conveying roller. Under the action of the water jet from the high-pressure nozzle, the polymetallic nodules and rare earth solids rotate and move upwards inside the rotating cavity along the rotation direction of the rotating cavity.

[0013] Furthermore, the dilute soft substrate curing solution is prepared according to the mass ratio of 30-50 parts sodium silicate, 8-15 parts alkaline activator, 15-25 parts shell powder, 10-20 parts coral powder, and 10-15 parts water. The mass ratio of water to other substances in the dilute soft substrate curing solution is 1:(2-2.5), and the mass ratio of shell powder, coral powder, and other substances in the dilute soft substrate curing solution is (3.5-5):1.

[0014] Then, this invention discloses a method for co-collecting deep-sea polymetallic nodules and rare earth elements, using the deep-sea polymetallic nodules and rare earth element co-collecting equipment described above, including the following steps: S1. Control the mining vehicle to reach the designated polymetallic nodule and rare earth coexistence area, and control the underwater robot to uniformly spray the coexistence area with a thin soft bottom solidification liquid. After the spraying is completed, the underwater robot returns to the mining vehicle. S2. After the rare earth solidifies, control the mining vehicle to reach the designated area where polymetallic nodules and rare earth coexist. Start the water jet conveying mechanism and the collection conveying mechanism. The polymetallic nodules and rare earth solids are lifted by the high-pressure nozzle and then conveyed by the conveying rollers into the input end of the conveyor chain / belt. They are then conveyed into the silo by the conveyor chain / belt. S3. After the polymetallic nodules and rare earth solids in the upper layer have been collected, the water jet conveying mechanism and the collection conveying mechanism are turned off. The mining vehicle is controlled to reach the designated polymetallic nodules and rare earth coexistence area. The underwater robot is controlled to spray the coexistence area with a thin soft bottom solidification liquid evenly. After the spraying is completed, the underwater robot returns to the mining vehicle. After the rare earth has solidified, the mining vehicle is controlled to reach the designated polymetallic nodules and rare earth coexistence area and the collection of polymetallic nodules and rare earth solids in the lower layer begins. S4. Repeat step S3, collecting layer by layer from the upper layer to the lower layer until all polymetallic nodules and rare earth elements in the coexistence area are collected, and then proceed to the next polymetallic nodule and rare earth coexistence area.

[0015] Furthermore, in steps S2-S4, before the water jet conveying mechanism is started, the conveying roller is controlled to move downward as a whole, and then the driving component is controlled to drive the conveying roller to rotate, so that the crushing aggregate plate at the end of the conveying blade crushes the plated polymetallic nodules and rare earth solids.

[0016] Compared with the prior art, the advantages of the present invention are as follows: This invention involves a mining vehicle coupled with an underwater robot reaching a designated area where polymetallic nodules and rare earth elements coexist. The underwater robot then sprays a solidifying liquid onto the soft rare earth substrate within the coexistence area, solidifying the soft rare earth substrate into a solid rare earth element. This facilitates collection by the mineral extraction device, prevents the flow and dispersion of the soft rare earth substrate, reduces disturbance during the collection process, and avoids the problem of feather flow. This achieves efficient and simultaneous collection of polymetallic nodules and rare earth elements. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a deep-sea polymetallic nodule and rare earth co-collection device disclosed in a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the separation between the underwater robot and the mining vehicle body according to a preferred embodiment of the present invention; Figure 3 This is an isometric side view of a deep-sea polymetallic nodule and rare earth co-collection device disclosed in a preferred embodiment of the present invention; Figure 4 This is a three-dimensional schematic diagram of the underwater robot disclosed in a preferred embodiment of the present invention; Figure 5 This is a schematic diagram of the installation of a high-pressure nozzle according to a preferred embodiment of the present invention; Figure 6 This is a schematic diagram of the collection principle of the deep-sea polymetallic nodules and rare earth co-collection device disclosed in a preferred embodiment of the present invention.

[0018] Legend: 1. Mining vehicle body; 11. Solidifying liquid tank; 12. Material hopper; 13. First protective plate; 14. Second protective plate; 2. Mineral collection device; 21. Water jet conveying mechanism; 211. High-pressure nozzle; 22. Collection and conveying mechanism; 221. Conveyor chain / belt; 222. Conveyor roller; 223. Conveyor blade; 224. Drag-reducing filter hole; 225. Crushing and collecting plate; 226. Rotating conveying direction; 227. Collection trough; 228. Guide slope; 3. Underwater robot; 31. Spraying device; 32. Spiral propulsion device; 33. Signal light; 34. Connecting conveying pipeline; 4. Soft bottom solidifying liquid; 5. Rotating cavity; 51. Rotation direction. Detailed Implementation

[0019] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0020] like Figure 1-6As shown, this embodiment first discloses a deep-sea polymetallic nodule and rare earth co-collection device, including a mining vehicle body 1, a mineral collection device 2 installed on the mining vehicle body 1, and an underwater robot 3. The mining vehicle body 1 adopts a tracked chassis, and a solidification liquid tank 11 for loading a thin soft bottom solidification liquid 4 is set inside the mining vehicle body 1. The solidification liquid tank 11 is connected to the underwater robot 3. The underwater robot 3 also includes a rotary propulsion device 32, a signal light 33, and a connecting conveying pipe 34, etc. In terms of connection method, the solidification liquid tank 11 and the underwater robot 3 can be replenished with the thin soft bottom solidification liquid 4 in a manner similar to refueling a car. When the underwater robot 3 is working, the connecting conveying pipe 34 of the underwater robot 3 is disconnected from the output pipe of the solidification liquid tank 11 on the mining vehicle body 1. When it is necessary to replenish the thin soft bottom solidification liquid 4, the connecting conveying pipe 34 of the underwater robot 3 is connected to the output pipe 15. The underwater robot 3 is equipped with a spraying device 31 for spraying a solidifying liquid 4 onto the coexisting area of ​​polymetallic nodules and rare earth elements. The mineral collection device 2 collects and transports the polymetallic nodules and the solidified rare earth elements to the hopper 12 of the mining vehicle 1. This invention allows the mining vehicle 1, together with the underwater robot 3, to reach the designated area where polymetallic nodules and rare earth elements coexist. The underwater robot 3 then sprays the solidifying liquid 4 onto the coexisting area, solidifying the soft rare earth elements into rare earth solids. This facilitates collection by the mineral collection device 2, prevents the flow and dispersion of the soft rare earth elements, reduces disturbance during the collection process, avoids the formation of plumes, and achieves efficient simultaneous collection of polymetallic nodules and rare earth elements.

[0021] In this embodiment, the mineral collection device 2 includes a water jet conveying mechanism 21 and a collection and conveying mechanism 22. The collection and conveying mechanism 22 includes a conveyor chain / belt 221 connected to the silo 12. The water jet conveying mechanism 21 includes a high-pressure nozzle 211 for lifting and conveying polymetallic nodules and rare earth solids to the input end of the conveyor chain / belt 221. The water jet from the high-pressure nozzle 211 pushes the polymetallic nodules and rare earth solids at the bottom to be lifted and moved toward the input port of the silo 12 (the input end of the conveyor chain / belt 221), and further conveyed into the silo 12 by the conveyor chain / belt 221.

[0022] In this embodiment, the collection and conveying mechanism 22 includes a conveying roller 222 and a driving component for rotating the conveying roller 222. The driving component is a conventional hydraulic motor or electric motor. The conveying roller 222 is located in front of the input end of the conveyor chain / belt 221. The conveying roller 222 is provided with a conveying blade 223, and the conveying blade 223 is provided with drag-reducing filter holes 224. The drag-reducing filter holes 224 have two functions: one is drag reduction, so that seawater can pass through the drag-reducing filter holes 224 on the conveying blade 223 when the conveying roller 222 rotates, reducing rotational resistance; the other is filtration, thereby screening and filtering smaller particles. At the same time, when conveyed to the conveyor chain / belt 221, it can also have a cleaning effect, improving the quality of collection. The drive unit drives the conveyor blades 223 to rotate, so as to transport the raised polymetallic nodules and rare earth solids to the input end of the conveyor chain / belt 221. The polymetallic nodules and solidified rare earth solids enter between the conveyor blades 223 from one side of the conveyor roller 222, and then fall into the input end of the conveyor chain / belt 221 from the other side of the conveyor roller 222.

[0023] In this embodiment, one end of the conveying blade 223 is connected to the conveying roller 222, and the other end is provided with a crushing collection plate 225 for crushing the caking polymetallic nodules and rare earth solids. Thus, the crushing collection plate 225 and the conveying blade 223 form a "T" or "L" shape. The crushing collection plate 225 and the conveying blade 223 form a collection trough 227 in the rotational conveying direction 226 of the conveying roller 222. That is, the crushing collection plate 225 has two functions. First, when metal nodules and rare earths may caking, they can be crushed by the crushing collection plate 225, which facilitates water jet lifting and conveying. Second, the crushing collection plate 225 and the conveying blade 223 can form a collection trough 227, thereby preventing the mineral material entering between the conveying blades 223 from detaching under the action of centrifugal force and buoyancy, thus playing the role of holding mineral particles.

[0024] In this embodiment, to facilitate the rapid lifting of polymetallic nodules and rare earth solids and their flow towards the inlet of the guide hopper 12, the crushing and collecting plate 225 has a guiding slope 228 formed on the rotational conveying direction 226 of the conveying roller 222. The high-pressure nozzle 211 lifts the polymetallic nodules and rare earth solids and guides them upwards along the guiding slope 228 to the inlet of the hopper 12. When the high-pressure nozzle 211 pushes the polymetallic nodules and rare earth solids at the bottom, they encounter the obstruction of the conveying roller 222 and move upwards, thus lifting the polymetallic nodules and rare earth solids. The presence of the guiding slope 228 allows the polymetallic nodules and rare earth solids to move along it, improving collection efficiency.

[0025] In this embodiment, the mining vehicle body 1 includes a first protective plate 13 and a second protective plate 14. The first protective plate 13 and the second protective plate 14 are disposed at the front end of the mining vehicle body 1 in the direction of travel. When there is an undetected obstacle in front, physical protection is achieved through the first protective plate 13 and the second protective plate 14. One end of the first protective plate 13 is fixedly hinged to the mining vehicle body 1, and the other end is fixedly hinged to one end of the second protective plate 14, thereby forming a "V" shaped structure. The other end of the second protective plate 14 is connected to the high-pressure nozzle 211, thus also playing a dual role of protecting the high-pressure nozzle 211 and providing an installation position for the high-pressure nozzle 211.

[0026] In this embodiment, the inner walls of the first protective plate 13, the second protective plate 14, the conveying roller 222, and the inlet of the hopper 12 form a rotating cavity 5. The spray direction of the high-pressure nozzle 211 is tilted towards the lower front of the conveying roller 222. Under the action of the water jet from the high-pressure nozzle 211, the polymetallic nodules and rare earth solids rotate along the rotation direction 51 of the rotating cavity 5 at the top inside the rotating cavity 5, thereby firmly "locking" the raised polymetallic nodules and rare earth solids inside the rotating cavity 5, and finally falling into the conveying roller 222 and being transported to the hopper 12, thus preventing the raised polymetallic nodules and rare earth solids from escaping to the outside of the mining vehicle body 1.

[0027] In this embodiment, the dilute soft substrate solidification solution 4 is prepared according to the following mass ratio: 30-50 parts sodium silicate, 8-15 parts alkaline activator, 15-25 parts shell powder, 10-20 parts coral powder, and 10-15 parts water. The mass ratio of water to other substances in the dilute soft substrate solidification solution 4 is 1:(2-2.5), and the mass ratio of shell powder, coral powder, and other substances in the dilute soft substrate solidification solution 4 is (3.5-5):1. The dilute soft substrate solidification solution 4 has extremely high ecological compatibility and minimal potential impact on the ecosystem. It can undergo water degradation on its own after use. Furthermore, it achieves the resource utilization of marine-industrial waste, saving energy and protecting the environment.

[0028] Then, this invention discloses a method for co-collecting deep-sea polymetallic nodules and rare earth elements, using the deep-sea polymetallic nodules and rare earth element co-collecting equipment of this invention, including the following steps: S1. Control the mining vehicle 1 to reach the designated area where polymetallic nodules and rare earth coexist. Control the underwater robot 3 to evenly spray the soft bottom solidification liquid 4 on the coexistence area. After spraying, the underwater robot 3 returns to the mining vehicle 1, thereby solidifying the polymetallic nodules and rare earth at 0-2m on the seabed. S2. After the rare earth solidifies, control the mining vehicle 1 to reach the designated area where polymetallic nodules and rare earth coexist. Start the water jet conveying mechanism 21 and the collection conveying mechanism 22. The polymetallic nodules and rare earth solids are lifted by the high-pressure nozzle 211 and then conveyed by the conveying roller 222 into the input end of the conveyor chain / belt 221. They are then conveyed into the hopper 12 through the conveyor chain / belt 221. S3. Due to the limited penetration ability of the dilute soft bottom solidification liquid 4, after the polymetallic nodules and rare earth solids in the upper layer are collected, the water jet conveying mechanism 21 and the collection conveying mechanism 22 are closed. The mining vehicle body 1 is controlled to reach the designated polymetallic nodules and rare earth coexistence area. The underwater robot 3 is controlled to spray the dilute soft bottom solidification liquid 4 evenly on the coexistence area. After the spraying is completed, the underwater robot 3 returns to the mining vehicle body 1. After the rare earth solidifies, the mining vehicle body 1 is controlled to reach the designated polymetallic nodules and rare earth coexistence area and start collecting the polymetallic nodules and rare earth solids in the lower layer. S4. Repeat step S3, collecting layer by layer from the upper layer to the lower layer until the polymetallic nodules and rare earth elements in the coexisting area are collected. Then proceed to the next polymetallic nodule and rare earth coexisting area to achieve efficient layered collection of polymetallic nodules and rare earth elements.

[0029] In this embodiment, in steps S2-S4, when some polymetallic nodules and rare earth elements solidify and clump together, they cannot be effectively lifted by the high-pressure nozzle 211. Therefore, it is necessary to break up the clumps before collection. Thus, before the water jet conveying mechanism 21 is started, the conveying roller 222 is controlled to move downward as a whole, and then the driving component is controlled to drive the conveying roller 222 to rotate, so that the crushing collection plate 225 at the end of the conveying blade 223 crushes the clumped polymetallic nodules and rare earth solids.

[0030] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A device for the joint collection of deep-sea polymetallic nodules and rare earth elements, characterized in that, The system includes a mining vehicle body (1), a mineral collection device (2) installed on the mining vehicle body (1), and an underwater robot (3). The underwater robot (3) is equipped with a spraying device (31) for spraying a solidified liquid (4) of a rare soft bottom layer onto the polymetallic nodules and rare earth coexistence area. The mineral collection device (2) collects and transports the polymetallic nodules and solidified rare earth solids into the hopper (12) of the mining vehicle body (1).

2. The deep-sea polymetallic nodules and rare earth co-collection device according to claim 1, characterized in that, The mineral collection device (2) includes a water jet conveying mechanism (21) and a collection and conveying mechanism (22). The collection and conveying mechanism (22) includes a conveying chain / belt (221) connected to the silo (12). The water jet conveying mechanism (21) includes a high-pressure nozzle (211) for lifting and conveying polymetallic nodules and rare earth solids to the input end of the conveying chain / belt (221).

3. The deep-sea polymetallic nodules and rare earth co-collection device according to claim 2, characterized in that, The collection and conveying mechanism (22) includes a conveying roller (222) and a driving member for driving the conveying roller (222) to rotate. The conveying roller (222) is provided with a conveying blade (223), and the conveying blade (223) is provided with a drag-reducing filter hole (224). The driving member drives the conveying blade (223) to rotate so as to convey the raised polymetallic nodules and rare earth solids to the input end of the conveying chain / belt (221).

4. The deep-sea polymetallic nodules and rare earth co-collection device according to claim 3, characterized in that, One end of the conveying blade (223) is connected to the conveying roller (222), and the other end is provided with a crushing collection plate (225) for crushing the plated polymetallic nodules and rare earth solids. The crushing collection plate (225) and the conveying blade (223) form a collection groove (227) in the rotational conveying direction (226) of the conveying roller (222).

5. The deep-sea polymetallic nodules and rare earth co-collection device according to claim 4, characterized in that, The crushing aggregate plate (225) has a guide slope (228) formed on the rotational conveying direction (226) of the conveying roller (222). The high-pressure nozzle (211) lifts the polymetallic nodules and rare earth solids and guides them upward along the guide slope (228) to the inlet of the hopper (12).

6. The deep-sea polymetallic nodules and rare earth co-collection device according to claim 3, characterized in that, The mining vehicle body (1) includes a first protective plate (13) and a second protective plate (14). The first protective plate (13) and the second protective plate (14) are located at the front end of the mining vehicle body (1) in the direction of travel. One end of the first protective plate (13) is fixedly hinged to the mining vehicle body (1), and the other end is fixedly hinged to one end of the second protective plate (14). The other end of the second protective plate (14) is connected to the high-pressure nozzle (211).

7. The deep-sea polymetallic nodules and rare earth co-collection device according to claim 6, characterized in that, The inner wall of the first protective plate (13), the second protective plate (14), the conveying roller (222) and the inlet of the hopper (12) forms a rotary cavity (5). The spray direction of the high-pressure nozzle (211) is tilted towards the lower side in front of the conveying roller (222). The polymetallic nodules and rare earth solids rotate and move above the inside of the rotary cavity (5) along the rotation direction (51) of the rotary cavity (5) under the action of the water jet of the high-pressure nozzle (211).

8. The deep-sea polymetallic nodules and rare earth co-collection device according to any one of claims 1-7, characterized in that, The dilute soft substrate curing liquid (4) is prepared according to the mass ratio of 30-50 parts sodium silicate, 8-15 parts alkaline activator, 15-25 parts shell powder, 10-20 parts coral powder, and 10-15 parts water. The mass ratio of water to other substances in the dilute soft substrate curing liquid (4) is 1:(2-2.5), and the mass ratio of shell powder, coral powder, and other substances in the dilute soft substrate curing liquid (4) is (3.5-5):

1.

9. A method for the joint collection of deep-sea polymetallic nodules and rare earth elements, characterized in that, The method of using the deep-sea polymetallic nodules and rare earth co-collection equipment as described in any one of claims 1-8 includes the following steps: S1. Control the mining vehicle (1) to reach the designated polymetallic nodule and rare earth coexistence area, and control the underwater robot (3) to uniformly spray the coexistence area with a thin soft bottom solidification liquid (4). After the spraying is completed, the underwater robot (3) returns to the mining vehicle (1). S2. After the rare earth solidifies, control the mining vehicle (1) to reach the designated area where polymetallic nodules and rare earth coexist. Start the water jet conveying mechanism (21) and the collection conveying mechanism (22). The polymetallic nodules and rare earth solids are lifted by the high-pressure nozzle (211) and then conveyed by the conveying roller (222) into the input end of the conveying chain / belt (221). They are then conveyed into the silo (12) through the conveying chain / belt (221). S3. After the polymetallic nodules and rare earth solids in the upper layer are collected, the water jet conveying mechanism (21) and the collection conveying mechanism (22) are closed. The mining vehicle (1) is controlled to reach the designated polymetallic nodules and rare earth coexistence area. The underwater robot (3) is controlled to spray the coexistence area with a uniform solution of a thin soft bottom solidification liquid (4). After the spraying is completed, the underwater robot (3) returns to the mining vehicle (1). After the rare earth solidifies, the mining vehicle (1) is controlled to reach the designated polymetallic nodules and rare earth coexistence area and start collecting polymetallic nodules and rare earth solids in the lower layer. S4. Repeat step S3, collecting layer by layer from the upper layer to the lower layer until all polymetallic nodules and rare earth elements in the coexistence area are collected, and then proceed to the next polymetallic nodule and rare earth coexistence area.

10. The method for co-collecting deep-sea polymetallic nodules and rare earth elements according to claim 9, characterized in that, In steps S2-S4, before the water jet conveying mechanism (21) is started, the conveying roller (222) is controlled to move downward as a whole, and then the driving component is controlled to drive the conveying roller (222) to rotate, so that the crushing aggregate plate (225) at the end of the conveying blade (223) crushes the plated polymetallic nodules and rare earth solids.

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