Foundation component for stacking radioactive tailings and stacking method

Abstract

The invention provides a basic component for radioactive tailing stacking and a stacking method, and relates to the technical field of hard rock uranium mine mining, the basic component comprises a component main body, a convex seat, a concave seat, an upper seepage groove, a side seepage groove, a pin hole and a bamboo wood pin; according to the method, all layers of foundation components are arranged side by side in a staggered mode, the radioactive tailing building body stable in structure is obtained, the radioactive tailing building body is reinforced and supported through an up-and-down buckling structure and bamboo wood pins, an upper seepage groove and a side seepage groove are designed, it is guaranteed that gaps of the foundation components stacked up and down are aligned with the seepage grooves, seepage liquid is made to flow out easily, and the seepage effect is good. And the water holding capacity of stacked objects is reduced. The problems that in the prior art, the radioactive tailings are generally not subjected to curing forming, the stacking body structure is loose, and the tailings particles can be soaked in natural water to obtain radionuclides are solved.

Description

Technical Field

[0001] The invention relates to the technical field of hard rock uranium mining, and in particular to a basic component for radioactive tailings stacking and a stacking method. Background Art

[0002] The current surface leaching methods of uranium ore include heap leaching, pool leaching, stirring leaching and other processes. Uranium ore needs to be mined from the ore body and transported to the surface for disposal. Generally, the ore is crushed into a certain range of particle sizes by crushing and fine grinding, and then dissolved and leached with acid and alkali leaching agents. After leaching, the leachate is separated from the solid leaching residue, and the valuable metals are further recovered from the leachate. The pH of the generated leaching residue is mainly adjusted by lime, and the heavy metals and radionuclides in the carrier seepage liquid are neutralized and precipitated, and then transported to the tailings pond for stacking. The effluent from the tailings pond is disposed of by ion exchange adsorption and other process technologies.

[0003] The above methods for disposing leaching residues have problems. For example, when the leaching residues are simply piled up, the leaching residues are exposed during the process of unloading from the leaching residues to the tailings pond and covering the tailings in sections, and the surface dust is at risk of being carried by the air; rain and dew easily penetrate into the leaching residues, and radionuclides are slowly released, producing carried effluents, which still need to be collected, adsorbed, etc. Therefore, it is necessary to study new methods for solidifying and stacking leaching residues to eliminate the risk of radioactive solid diffusion. Summary of the invention

[0004] The purpose of the present invention is to provide a basic component and stacking method for radioactive tailings stacking to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present application provides a basic component for radioactive tailings stacking, comprising:

[0006] The basic component comprises a component body; a center line of an upper surface of the component body divides the upper surface into two identical first surfaces;

[0007] A convex seat of the same size is respectively arranged on the two first surfaces, the convex seat is a rectangular parallelepiped, and the center line of the convex seat is parallel to the center line of the upper surface of the component body;

[0008] The two bosses are symmetrical about the center line of the upper surface of the component body; the center points of the two bosses are respectively aligned with the center point of the first surface;

[0009] Each of the protrusions and the first surface where the protrusion is located form an upper surface frame, and the frame widths of the upper surface frames are the same;

[0010] A recess is provided on the lower surface of the component body; the recess is rectangular, the center line of the recess is parallel to the center line of the lower surface of the component body; the center point of the recess is aligned with the center point of the lower surface of the component body;

[0011] The lower surface of the component body and the recess form a lower surface frame, and the frame width of the lower surface frame is the same as the frame width of the upper surface frame;

[0012] An upper seepage groove is arranged on the center line of the upper surface of the component body; side seepage grooves are arranged on the center lines of the front surface and the rear surface of the component body; the two ends of the upper seepage groove are respectively connected to one end of the side seepage grooves located on the front surface and the rear surface.

[0013] In a second aspect, the present application also provides a method for stacking basic components for radioactive tailings stacking, comprising:

[0014] Placing a plurality of basic components end to end to obtain a basic component row, wherein the basic components include a first boss and a second boss, and the second boss of any one basic component in the basic component row is adjacent to the first boss of another basic component;

[0015] Placing a plurality of said basic component rows side by side and staggered to obtain a basic component layer, wherein a first protrusion of any one basic component is aligned with a second protrusion of a basic component in a basic component row adjacent to the basic component, and a second protrusion of any one basic component is aligned with a first protrusion of another basic component in a basic component row adjacent to the basic component;

[0016] A plurality of the basic component layers are stacked one above the other to form a radioactive tailings storage structure, wherein the basic component rows in any basic component layer are perpendicular to the basic component rows in the basic component layer adjacent to the basic component layer.

[0017] The beneficial effects of the present invention are:

[0018] (1) The present invention sets the seepage groove surface center position to ensure that when the upper and lower foundation components are misaligned and stacked, the seepage groove of the lower foundation component overlaps with the gap between the two upper foundation components, thereby allowing the seepage liquid to flow downward between the gap and the seepage groove, and finally guide the seepage liquid into the bottom of the radioactive tailings stack structure, and then collect it on the base of the radioactive tailings stack structure for drainage. Therefore, the existence of the seepage groove can reduce the water retention inside the stack body, guide the radioactive nuclides attached to the surface of the foundation component to be carried out by the seepage liquid, and reduce the risk of radioactive nuclides leakage from the radioactive tailings stack structure;

[0019] (2) The stacking structure formed by stacking the basic components of the present invention is stable and has a low level of radioactive nuclide leakage. On the one hand, a stable stacking structure, i.e., a radioactive tailings stacking structure, can be quickly formed. The stacking structure is strong and not easy to collapse, and personnel and vehicles can work on the newly built stacking structure; on the other hand, the risk of dry tailings dust on the surface escaping to the surrounding area is eliminated; at the same time, the solidified basic components are not easy to leak radioactive nuclides, preventing radioactive nuclides from entering water or soil with rainwater.

[0020] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a schematic structural diagram of the basic component described in an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the upper surface of the basic component described in an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the lower surface of the basic component described in an embodiment of the present invention;

[0025] Figure 4 The present invention is a flowchart of a method for stacking basic components for radioactive tailings stacking according to an embodiment of the present invention.

[0026] Figure 5 It is a process schematic diagram of the stacking method described in an embodiment of the present invention.

[0027] Markings in the figure: 1. component body; 2. convex seat; 3. bamboo wooden pin; 4. upper seepage groove; 5. pin hole; 6. concave seat; 7. side seepage groove; 8. upper surface frame; 9. lower surface frame. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] Embodiment 1:

[0031] This embodiment provides a basic component for radioactive tailings stacking.

[0032] See also Figure 1-Figure 3 , the figure shows the specific structure of the basic component 1 of the present invention.

[0033] The basic component comprises a component body 1; the center line of the upper surface of the component body 1 divides the upper surface into two identical first surfaces;

[0034] A convex seat 2 of the same size is respectively arranged on the two first surfaces, the convex seat 2 is a rectangular parallelepiped, and the center line of the convex seat 2 is parallel to the center line of the upper surface of the component body 1;

[0035] The two bosses 2 are symmetrical about the center line of the upper surface of the component body 1; the center points of the two bosses 2 are respectively aligned with the center points of the first surface;

[0036] Each of the protrusions 2 and the first surface where the protrusion 2 is located form an upper surface frame 8, and the frame widths of the upper surface frames 8 are the same;

[0037] A recess 6 is provided on the lower surface of the component body 1; the recess 6 is rectangular, and the center line of the recess 6 is parallel to the center line of the lower surface of the component body 1; the center point of the recess 6 is aligned with the center point of the lower surface of the component body 1;

[0038] The lower surface of the component body 1 and the recess 6 form a lower surface frame 9, and the frame width of the lower surface frame 9 is the same as the frame width of the upper surface frame 8;

[0039] An upper seepage groove 4 is arranged on the center line of the upper surface of the component body 1; side seepage grooves 7 are arranged on the center lines of the front surface and the rear surface of the component body 1; the two ends of the upper seepage groove 4 are respectively connected to one end of the side seepage grooves 7 located on the front surface and the rear surface.

[0040] The lower surface frame 9 is provided with six identical pin holes 5;

[0041] Each of the upper surface frames 8 is provided with three bamboo wooden pins 3; the positions of the bamboo wooden pins 3 correspond one-to-one to the positions of the pin holes 5 on the lower surface frame 9; the cross section of the pin hole 5 is the same as the cross section shape of the bamboo wooden pin 3.

[0042] The height of the bamboo wooden pin 3 is 4 to 5 cm; the depth of the pin hole 5 is 7 to 8 cm.

[0043] The depths of the upper seepage trough 4 and the side seepage trough 7 are both 2 to 3 cm, and the widths of the upper seepage trough 4 and the side seepage trough 7 are both 2 to 3 cm.

[0044] The length of the component body 1 is 25 to 35 cm; the height of the component body 1 is 6 to 12 cm; the height of the protrusion 2 is smaller than the height of the component body 1 .

[0045] The height of the protrusion 2 is the same as the depth of the recess 6 .

[0046] In this embodiment, the foundation component is formed by solidifying radioactive tailings after mold infusion and excitation, forming an upper seepage groove 4 on the top and two side seepage grooves 7 on the side surface. Before solidification, a bamboo wooden pin 3 is inserted next to the protruding seat 2, and a pin hole 5 is set at the corresponding position on the bottom of the foundation component.

[0047] In this embodiment, Figure 1-3 As shown, the component body 1 is a rectangular parallelepiped, so that the aspect ratio of the upper surface of the component body 1 is 2:1, and the center line of the upper surface of the component body 1 divides the upper surface into two identical first surfaces, and the two first surfaces are identical squares. At the same time, the upper surface of the protrusion 2 is set to be a square with a side length ranging from 6 to 12 cm. The protrusion 2 is located in the center of the first surface and forms an upper surface frame 8. The upper surface frame 8 is a square frame, and the width of each frame is the same.

[0048] A recess 6 is provided on the lower surface corresponding to the upper surface of the component body 1. When the two basic components overlap, the recess 6 of the upper basic component is aligned with the convex seat 2 of the lower basic component. The recess 6 of the upper basic component can completely buckle the convex seat 2 of the lower basic component, and a partial gap is left between the two convex seats 2 of the lower basic component. The gap is a fault-tolerant space to prevent the design from being unable to buckle due to large tolerance when the design is perfectly fitted.

[0049] In this embodiment, the lower surface frame 9 is provided with six identical pin holes 5, which are respectively located in the middle of the short side frame, and at one quarter and three quarters of the long side frame. At the same time, six bamboo wooden pins 3 are provided at corresponding positions on the two upper surface frames 8. When the two base components overlap, the bamboo wooden pins 3 of the lower base component are inserted into the upper pin holes 5.

[0050] Furthermore, since each basic component is exactly the same, the basic components provided in this embodiment can be placed side by side and staggered.

[0051] For every two basic components, the front end of one basic component is aligned with the middle position of the other basic component, ensuring that every two parallel basic components have two aligned protrusions 2. And the recessed seat 6 at the bottom of the upper superimposed basic component just buckles the front protrusion 2 of one basic component at the bottom and the rear protrusion 2 of the other basic component. Since each basic component is symmetrical and the positions of the bamboo wooden pin 3 and the pin hole 5 correspond, the bamboo wooden pin 3 on the lower basic component can be inserted into the pin hole 5 of the upper basic component.

[0052] Therefore, the present invention improves the stacking accuracy of the basic components through the bamboo wooden pin 3, and prevents the adverse effect of the slight sliding in the horizontal direction on the overall stacking. Specifically, the bamboo wooden pin 3 and the pin hole 5 are interlocked to prevent the slight sliding of multiple basic components from affecting the flatness of the side of the stacking body and increasing the lateral pressure when multiple layers are stacked. This is the role played by the interlocking of the auxiliary recess 6 and the protrusion 2, and at the same time supplements the fine control function that the interlocking of the recess 6 and the protrusion 2 does not have.

[0053] For some basic components with low tolerance, some pin holes 5 and bamboo wooden pins 3 cannot match, and the bamboo wooden pins 3 can be easily removed with scissors.

[0054] At the same time, bamboo wooden pins are low in cost, and the radioactive tailings dump structure formed by the basic components after natural degradation has been compacted by its own weight, which does not affect the structure of the radioactive tailings dump structure and prevents plastic products from polluting the environment.

[0055] In this embodiment, the upper seepage groove 4 is arranged at the center position of the upper surface of the foundation component, and the side seepage groove 7 is arranged at the center position of the front and rear surfaces of the foundation component, and is connected to the upper seepage groove 4. The seepage groove is arranged at the center position to ensure that when the upper and lower foundation components are misaligned and stacked, the upper seepage groove 4 of the lower foundation component overlaps with the gap between the two upper foundation components, thereby allowing the seepage liquid to flow downward between the gap and the seepage groove, and finally guiding the seepage liquid into the bottom of the radioactive tailings stacking structure, and then collecting on the base of the radioactive tailings stacking structure for drainage and collection.

[0056] Therefore, the existence of seepage grooves can reduce the water retention inside the stack, guide the radioactive nuclides attached to the surface of the basic components to be carried out by the seepage water, and reduce the risk of radioactive nuclides leakage from the stack.

[0057] In summary, the basic component structure designed in the present invention is used to manufacture the basic components for stacking radioactive tailings. By stacking the basic components, the risk of diffusion of loosely stacked radioactive tailings is avoided, a radioactive tailings structure with a stable structure is formed, and the release of radioactive nuclides is suppressed to prevent them from entering the air, water, soil and other environments.

[0058] The foundation components are actually tailings solidified bricks, which adopt the upper and lower buckle structure and wooden pin reinforcement support design to ensure that the stacked structure is stable and not easy to slide horizontally. At the same time, the wooden pins are made of bamboo to resist strong horizontal shear force. And the seepage groove design is adopted to ensure that the gaps between the upper and lower stacked components are aligned with the seepage groove, so that the seepage liquid can flow out easily and reduce the water retention of the stacked materials. It can be used for uranium ore leaching residues produced by conventional stirring leaching and heap leaching.

[0059] Embodiment 2:

[0060] This embodiment provides a method for stacking basic components for radioactive tailings stacking.

[0061] See also Figure 4 , the figure shows that the method includes step S100, step S200, and step S300.

[0062] Step S100: placing a plurality of basic components end to end to obtain a basic component row, wherein the basic components include a first boss and a second boss, and the second boss of any one basic component in the basic component row is adjacent to the first boss of another basic component;

[0063] In this embodiment, Figure 1 The two identical bosses 2 shown are respectively denoted as a first boss and a second boss.

[0064] Step S200: placing a plurality of said basic component rows side by side and staggered to obtain a basic component layer, wherein a first protrusion of any one basic component is aligned with a second protrusion of a basic component in a basic component row adjacent to the basic component, and a second protrusion of any one basic component is aligned with a first protrusion of another basic component in a basic component row adjacent to the basic component;

[0065] Step S300: placing a plurality of the basic component layers in an overlapping manner to form a radioactive tailings storage structure, wherein the basic component rows in any basic component layer are perpendicular to the basic component rows in the basic component layer adjacent to the basic component layer.

[0066] In the step S300, a plurality of basic component layers are stacked up and down to form a radioactive tailings stacking structure, including:

[0067] Step S301: The recess 6 of the upper stacked basic components is respectively buckled with the first protrusion of one basic component and the second protrusion of another basic component at the bottom;

[0068] Step S302: Hitting the upper stacked foundation components with a wooden hammer so that the bamboo wooden pins 3 on the lower foundation components are inserted into the corresponding pin holes 5 of the upper foundation components to obtain a radioactive tailings stacking structure.

[0069] In this embodiment, after a plurality of basic component layers are stacked up and down to form a radioactive tailings storage structure, the following further comprises:

[0070] The top of the radioactive tailings storage structure is drip-irrigated, and water seeps through the upper seepage trough 4, the side seepage trough 7 and the gaps between the foundation components to dissolve the radioactive nuclides adsorbed on the surface of the foundation components to obtain seepage liquid.

[0071] In this embodiment, Figure 5 After the radioactive tailings stacking structure is formed, it is necessary to drip irrigate the top of the radioactive tailings stacking structure for 72 hours to obtain the seepage liquid, collect the seepage liquid for analysis and further treatment, which can reduce the risk of radionuclide leakage in the stacking body.

[0072] In summary, the radioactive tailings dump structure formed after the foundation components are stacked has a stable structure and low radioactive nuclide leakage. On the one hand, it can quickly form a stable shape, the radioactive tailings dump structure has high strength and is not easy to collapse, and personnel and vehicles can work on the newly built radioactive tailings dump structure; on the other hand, it eliminates the risk of dry tailings dust on the surface escaping to the surroundings; at the same time, the solidified disposal foundation components are not easy to leak radioactive nuclides, preventing radioactive nuclides from entering water or soil with rainwater, etc., and are suitable for the disposal of uranium ore leaching residues produced by conventional or heap leaching processes.

[0073] Embodiment 3:

[0074] In this embodiment, a hard rock uranium mine originally adopted the acid heap leaching process, and the acid heap leaching slag produced was transported to the tailings pond for direct dumping and stacking, and the tailings dam was built after natural solidification and compaction.

[0075] The present invention is used to pour the leached residue after heap leaching into a mold, stimulate solidification, and form a basic component. Each layer of basic components is placed side by side and staggered, such as Figure 5 As shown, the basic components are laid in sequence to form a radioactive tailings dump structure.

[0076] The radioactive tailings stacking structure has strong horizontal pressure resistance, the compressive strength of the basic components is greater than 20MPa, the surface radon release rate is reduced by more than 40%, and there is basically no dust diffusion. The compressive strength and structural stability of the radioactive tailings stacking structure of the present invention are higher than those of the tailings dam built after natural solidification and compaction.

[0077] This embodiment also provides a hard rock uranium mine, which originally used acid stirring leaching and used a belt filter to filter the leached residue process. After filtering, the moisture content of the leached residue is less than 40%, 85% of the ore particle size is less than 180 mesh, the uranium grade is less than 0.02%, and the surface radon precipitation rate is 0.0635 Bg / (m 2 .s).

[0078] The method of the present invention is now used, and the leached slag is poured into a mold, stimulated and solidified to form a basic component. Each layer of basic components is placed side by side and staggered, such as Figure 5 As shown, the basic components are laid in sequence to form a radioactive tailings dump structure.

[0079] The radioactive tailings storage structure has strong horizontal pressure resistance, the compressive strength of the foundation components is greater than 20MPa, and the surface radon exhalation rate is reduced by more than 40%, with basically no dust diffusion.

[0080] Therefore, the method of the present invention can eliminate the risk of surface dry tailings dust escaping to the surroundings; at the same time, the structure of the formed radioactive tailings stacking structure is stable, and the basic components of the solidification disposal are not easy to leak radioactive nuclides, which prevents radioactive nuclides from entering the water or soil with rainwater, etc., and is suitable for the disposal of uranium ore leaching slag produced by conventional or heap leaching processes.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0082] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A basic component for radioactive tailings stacking, characterized in that: The basic component comprises a component body (1); a center line of an upper surface of the component body (1) divides the upper surface into two completely identical first surfaces; A convex seat (2) of the same size is respectively arranged on the two first surfaces, the convex seat (2) is a rectangular parallelepiped, and the center line of the convex seat (2) is parallel to the center line of the upper surface of the component body (1); The two bosses (2) are symmetrical about the center line of the upper surface of the component body (1); the center points of the two bosses (2) are respectively aligned with the center point of the first surface; Each of the convex seats (2) and the first surface on which the convex seat (2) is located form an upper surface frame (8), and the frame widths of the upper surface frames (8) are the same; A recess (6) is provided on the lower surface of the component body (1); the recess (6) is rectangular, and the center line of the recess (6) is parallel to the center line of the lower surface of the component body (1); the center point of the recess (6) is aligned with the center point of the lower surface of the component body (1); The lower surface of the component body (1) and the recess (6) form a lower surface frame (9), and the frame width of the lower surface frame (9) is the same as the frame width of the upper surface frame (8); An upper seepage groove (4) is arranged on the center line of the upper surface of the component body (1); side seepage grooves (7) are arranged on the center lines of the front surface and the rear surface of the component body (1); and the two ends of the upper seepage groove (4) are respectively connected to one end of the side seepage grooves (7) located on the front surface and the rear surface.

2. The basic component for radioactive tailings stacking according to claim 1, characterized in that , the lower surface frame (9) is provided with six identical pin holes (5); Each of the upper surface frames (8) is provided with three bamboo wooden pins (3); the positions of the bamboo wooden pins (3) correspond one-to-one to the positions of the pin holes (5) on the lower surface frame (9); and the cross-section of the pin holes (5) is the same as the cross-section of the bamboo wooden pins (3).

3. The basic component for radioactive tailings stacking according to claim 2, characterized in that The height of the bamboo wooden pin (3) is 4 to 5 cm; the depth of the pin hole (5) is 7 to 8 cm.

4. The basic component for radioactive tailings stacking according to claim 1, characterized in that The depth of the upper seepage trough (4) and the side seepage trough (7) are both 2 to 3 cm, and the width of the upper seepage trough (4) and the side seepage trough (7) are both 2 to 3 cm.

5. The basic component for radioactive tailings stacking according to claim 1, characterized in that The length of the component body (1) is 25 to 35 cm; the height of the component body (1) is 6 to 12 cm; and the height of the protrusion (2) is less than the height of the component body (1).

6. The basic component for radioactive tailings stacking according to claim 1, characterized in that , the height of the convex seat (2) is the same as the depth of the concave seat (6).

7. A method for stacking foundation components for radioactive tailings, characterized in that ,include: Placing a plurality of basic components end to end to obtain a basic component row, wherein the basic components include a first boss and a second boss, and the second boss of any one basic component in the basic component row is adjacent to the first boss of another basic component; Placing a plurality of said basic component rows side by side and staggered to obtain a basic component layer, wherein a first protrusion of any one basic component is aligned with a second protrusion of a basic component in a basic component row adjacent to the basic component, and a second protrusion of any one basic component is aligned with a first protrusion of another basic component in a basic component row adjacent to the basic component; A plurality of the basic component layers are stacked one above the other to form a radioactive tailings storage structure, wherein the basic component rows in any basic component layer are perpendicular to the basic component rows in the basic component layer adjacent to the basic component layer.

8. The method for stacking foundation components for radioactive tailings according to claim 7, characterized in that , multiple foundation component layers are placed one above the other to form a radioactive tailings dump structure, including: The recessed seats (6) of the upper stacked basic components are respectively buckled with the first protruding seat of one basic component and the second protruding seat of another basic component at the bottom; The upper stacked basic components are struck by a wooden hammer so that the bamboo wooden pins (3) on the lower basic components are inserted into the corresponding pin holes (5) of the upper basic components, thereby obtaining a radioactive tailings stacking structure.

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