Leaching reaction kettle

Abstract

The invention discloses a leaching reaction kettle. The leaching reaction kettle comprises a reaction tank, a stirring assembly, a guide cylinder and an aeration pipe. The stirring assembly comprises a stirring part; the flow guide cylinder is arranged in the reaction tank, the flow guide cylinder divides the reaction tank into an inner side space and an outer side space, the flow guide cylinder is arranged around the stirring part and defines the inner side space, the stirring part is used for driving fluid in the inner side space to flow upwards, the flow guide cylinder is provided with an upper opening and a lower opening, and the upper opening is communicated with the lower opening. The inner side space and the outer side space are communicated through the upper opening and the lower opening; and the aeration pipe is used for introducing reaction gas into the lower part of the inner side space. The leaching reaction kettle can improve the leaching efficiency of materials and the utilization rate of reaction gas.

Description

Technical Field

[0001] The invention relates to the technical field of leaching devices, in particular to a leaching reactor. Background Art

[0002] The process of recycling battery positive electrode materials includes a leaching process. In the related art, when the battery positive electrode materials are leached, the battery positive electrode materials are directly put into the top of the reactor for dissolution, sulfur dioxide and concentrated sulfuric acid are introduced into the top of the reactor, and the reaction is directly carried out under the action of stirring (conventional downward pressure axial flow impeller). In the actual leaching process, the leaching efficiency of the battery positive electrode materials in the leaching reactor is low, and the utilization rate of sulfur dioxide is low. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a leaching reactor that can improve the leaching efficiency of materials and the utilization rate of reaction gas.

[0004] According to an embodiment of the present invention, the leaching reactor comprises a reaction tank, a stirring assembly, a guide tube and an aeration pipe, wherein the stirring assembly comprises a stirring portion; the guide tube is arranged in the reaction tank, the guide tube divides the reaction tank into an inner space and an outer space, the guide tube is arranged around the stirring portion and defines the inner space, the stirring portion is used to drive the fluid in the inner space to flow upward, the guide tube has an upper opening and a lower opening, the inner space and the outer space are connected through the upper opening and the lower opening; the aeration pipe is used to introduce reaction gas into the lower part of the inner space.

[0005] According to the leaching reactor of the embodiment of the present invention, a guide tube is provided, which separates the reaction tank to form an inner space and an outer space. During the leaching process, the fluids in the inner space and the outer space will circulate according to a specific flow pattern, and all materials in the reaction tank can pass through the inner space defined by the guide tube, thereby improving the circulation and mixing effect of the materials, thereby improving the leaching efficiency and leaching rate of the materials to be leached. At the same time, the amount of direct escape of the reaction gas can be reduced, and the local concentration of the reaction gas can be increased, thereby increasing the utilization rate of the reaction gas; on the other hand, the stirring part in the embodiment of the present application is used to drive the fluid in the inner space to flow upward, and the rising fluid has a better effect of destroying the powder film formed on the upper surface of the liquid, which can make the liquid and the powder film mix more quickly, thereby accelerating the reaction process and improving the reaction efficiency. Therefore, the leaching reactor of the embodiment of the present invention can improve the leaching efficiency and leaching rate of the materials to be leached.

[0006] In some embodiments, the stirring portion includes a stirring blade, and the stirring blade includes a first part and a second part. Along the rotation direction and from top to bottom, the first part and the second part are arranged in sequence at a set angle.

[0007] In some embodiments, the stirring diameter of the stirring blade is D1, the inner diameter of the guide tube is L,

[0008] In some embodiments, the upper opening includes the upper end opening of the guide tube; and / or, the upper end portion of the circumferential side wall of the guide tube is formed with a plurality of through holes, the through holes are arranged spaced apart along the circumferential direction, and the upper opening includes the plurality of the through holes.

[0009] In some embodiments, the guide tube is connected to the inner wall of the reaction tank via a connecting bracket.

[0010] In some embodiments, the inner diameter of the reaction tank is D, the inner diameter of the guide tube is L, The height of the reaction tank is H, the height of the upper end of the guide tube from the bottom of the reaction tank is h1, h1 = 0.6H ~ 0.7H, the distance between the lower end opening of the guide tube and the bottom wall of the reaction tank is h2,

[0011] In some embodiments, the stirring section includes a stirring blade and a breaking blade, the stirring blade is used to drive the fluid in the inner space to flow upward, the breaking blade is located below the stirring blade, and the breaking blade is located above the outlet end of the aeration pipe and is used to break up the reaction gas.

[0012] In some embodiments, the outlet end of the aeration pipe is oriented in a set direction, the set direction is inclined from top to bottom and in a direction close to the middle of the reaction tank, the stirring diameter of the breaking blade is D2, the distance between the outlet end of the aeration pipe and the rotation axis of the stirring part is D3,

[0013] In some embodiments, the inner diameter of the reaction tank is D, the distance between the breaking blade and the bottom wall of the reaction tank is h3,

[0014] In some embodiments, the gas flow velocity at the outlet end is less than the linear velocity of the outermost end of the scattering blade.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a cross-sectional view of a leaching reactor according to an embodiment of the present invention;

[0018] Figure 2 It is a schematic structural diagram of a stirring part in a leaching reactor according to an embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of a stirring assembly in a leaching reactor according to an embodiment of the present invention;

[0020] Figure 4 It is a schematic structural diagram of a draft tube in a leaching reactor according to an embodiment of the present invention;

[0021] Figure 5 It is a top view of the leaching reactor according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] Leaching reactor 100;

[0024] Reaction tank 10;

[0025] Inner space 101; outer space 102; inclined wall 103;

[0026] A stirring component 20;

[0027] Stirring part 201; stirring blade 202; first part 2021; second part 2022;

[0028] Breaking up blade 203; connecting member 2031; blade 2032; stirring driving member 204; stirring shaft 205;

[0029] Guide tube 30;

[0030] Upper opening 301; lower opening 302; upper end opening 3011; through hole 3012;

[0031] Aeration pipe 40; outlet end 401; rotation direction F; connecting bracket 50; rotation axis R;

[0032] Solution inlet 60; feed inlet 70; support 80. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used in the present invention and the specification of the invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the embodiments of the present invention, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present invention shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation to the present invention.

[0038] The term "plurality" used in the present invention refers to two or more (including two).

[0039] Combine the following Figures 1 to 5 The leaching reactor 100 of the present invention will be described.

[0040] like Figures 1 to 5 As shown, the leaching reactor 100 according to the embodiment of the present invention includes a reaction tank 10, a stirring assembly 20, a guide tube 30 and an aeration pipe 40, the stirring assembly 20 includes a stirring portion 201; the guide tube 30 is arranged in the reaction tank 10, the guide tube 30 divides the reaction tank 10 to form an inner space 101 and an outer space 102, the guide tube 30 is arranged around the stirring portion 201 and defines the inner space 101, the stirring portion 201 is used to drive the fluid in the inner space 101 to flow upward, the guide tube 30 has an upper opening 301 and a lower opening 302, the inner space 101 and the outer space 102 are connected through the upper opening 301 and the lower opening 302; the aeration pipe 40 is used to introduce the reaction gas into the lower part of the inner space 101.

[0041] Specifically, when the leaching process is carried out, materials such as the material to be leached, the leaching treatment solution, and the reaction gas need to be put into the reaction tank 10 for reaction. The stirring assembly 20 includes a stirring portion 201, a stirring shaft 205, and a stirring drive 204. The stirring drive 204 is used to drive the stirring portion 201 to rotate through the stirring shaft 205 to stir and mix the materials in the reaction tank 10. The stirring portion 201 is used to drive the fluid in the inner space 101 to flow upward. For example, the stirring portion 201 can be an upward axial flow paddle. The stirring portion 201 includes a plurality of stirring blades 202. The stirring blades 202 extend downwardly along the rotation direction F of the stirring portion 201 as a whole, so that the stirring portion 201 can drive the fluid in the inner space 101 to flow upward. Exemplarily, the rotation axis R of the stirring portion 201 extends vertically.

[0042] The guide tube 30 is arranged in the reaction tank 10, and the guide tube 30 divides the reaction tank 10 to form an inner space 101 and an outer space 102. The guide tube 30 is arranged around the stirring part 201 and defines the inner space 101. The stirring part 201 is used to drive the fluid in the inner space 101 to flow upward. The guide tube 30 has an upper opening 301 and a lower opening 302. The inner space 101 and the outer space 102 are connected through the upper opening 301 and the lower opening 302.

[0043] During the leaching process, driven by the stirring part 201, the fluid in the inner space 101 flows upward, then enters the outer space 102 from the upper opening 301 of the guide tube 30, and the fluid in the outer space 102 flows downward, and finally returns to the inner space 101 from the lower opening 302 of the guide tube 30, thereby forming a complete cycle ( Figure 1 The straight arrow in the middle is a schematic diagram of the flow path of the fluid in the reaction tank 10).

[0044] By arranging the guide tube 30 in the reaction tank 10, the guide tube 30 can effectively control the speed and direction of the liquid reflux in the reaction tank 10 to obtain a specific flow pattern. The guide tube 30 and the stirring part 201 cooperate so that the fluid can circulate along a specific circulation path when flowing, and establish a fully circulated flow pattern, so that all materials in the reaction tank 10 can pass through the inner space 101 defined by the guide tube 30, that is, through the intense mixing zone, increase the length of the material circulation path, reduce the possibility of short-circuiting the material, thereby improving the mixing efficiency of the material in the reaction tank 10, and the circulation mixing effect is better, thereby improving the leaching efficiency of the material to be leached.

[0045] The aeration pipe 40 is used to introduce the reaction gas into the material in the reaction tank 10. The reaction gas can also circulate in the reaction tank 10 according to a specific flow pattern along with the flow of the fluid, which can reduce the amount of direct escape of the reaction gas and prolong the residence time of the reaction gas in the fluid, thereby facilitating the improvement of the utilization rate of the reaction gas. At the same time, since the cross-sectional area of ​​the guide tube 30 is smaller than the cross-sectional area of ​​the reaction tank 10, when a certain amount of reaction gas flows through the inner space 101, the concentration of the reaction gas per unit cross-sectional area is greater, thereby facilitating the improvement of the reaction speed of the material in the reaction tank 10 and the improvement of the reaction efficiency.

[0046] The aeration pipe 40 is used to introduce the reaction gas into the lower part of the inner space 101. In this way, on the one hand, the movement path length of the reaction gas in the reaction tank 10 can be extended. On the other hand, the stirring part 201 can also play a certain role in breaking up the reaction gas discharged from the aeration pipe 40, which is beneficial to improve the uniformity of dispersion of the reaction gas and further improve the utilization rate of the reaction gas.

[0047] The leaching reactor 100 of the embodiment of the present invention is suitable for leaching materials with low density and hydrophobic characteristics. For example, the density is less than 2g / cm 3 The leaching of hydrophobic materials, for example, can be used for battery positive electrode materials (also known as positive electrode powder or black powder, with a density of 1.696g / cm in dry state). 3 ) Leaching of lithium, cobalt, nickel and manganese in .

[0048] After the positive electrode powder is put into the reaction tank 10, it is difficult to mix with the liquid in the reaction tank 10 due to its hydrophobicity and low density. The positive electrode powder floats on the upper surface of the fluid (such as concentrated sulfuric acid) in the reaction tank 10, and forms a layer of powder film. In the related art, the stirring part is a downward pressure axial flow paddle, and the force acting on the powder film is the suction force of the internal stirring downward vortex. When pressing down, the tension of the powder film is relatively large, and it is difficult to destroy the powder film. Only a small part of the positive electrode powder can be gradually moved downward along the center of the stirring shaft, and the positive electrode powder and the fluid are gradually mixed through liquid circulation.

[0049] In the present application, the stirring section 201 is used to drive the fluid in the inner space 101 to move upward. For example, the stirring section 201 in the present application can be an upward axial flow paddle. The stirring section 201 drives the fluid upward to impact and destroy the powder film. The falling fluid can better destroy the powder film. At the same time, the destroyed powder film will enter the circulation with the fluid in the outer space 102, so that the fluid and the positive electrode powder can be mixed more quickly, thereby accelerating the reaction process and improving the reaction efficiency and leaching rate.

[0050] In addition, the upward movement of the fluid can also increase the contact area between the fluid and the reaction gas in the space above the fluid, which is beneficial to further improve the utilization rate of the reaction gas.

[0051] According to the leaching reactor 100 of the embodiment of the present invention, by setting the guide tube 30, the guide tube 30 separates the reaction tank 10 to form the inner space 101 and the outer space 102. During the leaching process, the fluids in the inner space 101 and the outer space 102 will circulate according to a specific flow pattern, and all materials in the reaction tank 10 can pass through the inner space 101 defined by the guide tube 30, thereby improving the circulation and mixing effect of the materials, thereby improving the leaching efficiency and leaching rate of the materials to be leached, and at the same time, it can also reduce the amount of direct escape of the reaction gas, increase the local concentration of the reaction gas, and thus increase the utilization rate of the reaction gas; on the other hand, the stirring part 201 in the embodiment of the present application is used to drive the fluid in the inner space 101 to flow upward, and the rising fluid has a better effect of destroying the powder film formed on the upper surface of the liquid, which can make the liquid and the powder film mix more quickly, thereby accelerating the reaction process and improving the reaction efficiency. Therefore, the leaching reactor 100 of the embodiment of the present invention can improve the leaching efficiency and leaching rate of the materials to be leached.

[0052] In order to verify the effect of use, the inventor conducted two production line commissioning. In both production line commissioning, the volume of the leaching tank was 20 cubic meters. Sulfur dioxide was used to reduce the positive electrode powder, and the leaching treatment solution was concentrated sulfuric acid. Among them, the leaching rates of lithium, cobalt, nickel, and manganese were all greater than 99.80%, and the utilization rate of sulfur dioxide was increased to more than 90%.

[0053] According to some embodiments of the present invention, reference may be made to Figure 2 and Figure 3 As shown, the stirring portion 201 includes a stirring blade 202, and the stirring blade 202 includes a first portion 2021 and a second portion 2022. Along the rotation direction F and from top to bottom, the first portion 2021 and the second portion 2022 are arranged in sequence at a set angle. In other words, the stirring blade 202 in the embodiment of the present application is a folding paddle, that is, the angle between the first portion 2021 and the second portion 2022 is not 0.

[0054] By adopting the stirring blade 202 in the above technical solution, on the one hand, under the premise that the fluid in the inner space 101 can flow upward, the stirring blade 202 has a better stirring and mixing effect on the fluid, and can provide a higher circulation kinetic energy for the fluid; on the other hand, the stirring blade 202 has a higher structural strength and is not easily damaged. Exemplarily, the set angle can be 170°, 160°, 150°, 140°, 130°, 120°, 110°, 100°, 90°, 80°, 70°, 60°, 50°, 40°, 30°, 20°, 10° or any value between any two of them, etc., and no specific limitation is made here. In practice, a reasonable choice can be made according to the type of fluid, the type of material, the use effect, etc.

[0055] According to some embodiments of the present invention, reference may be made to Figure 2 and Figure 3 As shown, the stirring portion 201 includes a plurality of stirring blade groups spaced apart in the vertical direction, and each stirring blade group includes a plurality of stirring blades 202 spaced apart in the circumferential direction. Figures 1 to 3 As shown, two stirring blades 202 can be provided, but it is not limited thereto. The number of stirring blades can be reasonably increased or decreased according to the size of the reaction tank 10, the type and viscosity of the fluid, the stirring and mixing effect, etc.

[0056] By providing a plurality of stirring blade groups, the stirring intensity of the stirring part 201 on the fluid in the reaction tank 10 can be increased, the uniform dispersion of the material in the reaction tank 10 can be increased, the contact between the materials can be promoted, the reaction speed can be increased, and the circulation speed of the material in the reaction tank 10 can be increased. By properly arranging a plurality of stirring blade groups, the dead angle area in the reaction tank 10 can be reduced, so that as many areas as possible can obtain a good stirring effect.

[0057] According to some embodiments of the present invention, reference may be made to Figure 1 , the stirring diameter of the stirring blade 202 is D1, the inner diameter of the guide tube 30 is L, Here, the stirring diameter D1 of the stirring blade 202 refers to twice the distance between the outermost end of the stirring blade 202 and the stirring center axis. The inner diameter of the guide tube 30 here refers to the inner wall diameter of the guide tube 30, or the diameter of the inner space 101.

[0058] For example, the inner diameter of the guide tube 30 is Or any value between any two values. The stirring diameter D1 of the stirring blade 202 is within this range, so that the stirring diameter D1 of the stirring blade 202 will not be too small, resulting in the fluid in the inner space 101 not being fully stirred and mixed; the stirring radius D1 of the stirring blade 202 will not be too large. A large stirring diameter D1 of the stirring blade 202 is not conducive to the generation of a stable flow pattern, which will lead to poor controllability of the flow of the fluid, increased energy consumption, and is not conducive to uniform mixing.

[0059] According to some embodiments of the present invention, reference may be made to Figure 3 , the upper opening 301 includes the upper end opening 3011 of the guide tube 30. That is, the upper end opening 3011 of the guide tube 30 is formed as the upper opening 301 so that the fluid can flow between the inner space 101 and the outer space 102 through the upper end opening 3011.

[0060] According to some embodiments of the present invention, reference may be made to Figure 3 The upper end of the circumferential side wall of the guide tube 30 is formed with a plurality of through holes 3012, the through holes 3012 are arranged at intervals in the circumferential direction, and the upper opening 301 includes a plurality of through holes 3012. Here, the plurality of through holes 3012 are formed as the upper opening 301, so that the fluid can flow between the inner space 101 and the outer space 102 through the plurality of through holes 3012.

[0061] In some embodiments, reference may be made to Figure 3 The upper opening 301 includes an upper opening 3011 of the guide tube 30 and a plurality of through holes 3012 at the upper end of the circumferential side wall of the guide tube 30. In this way, when the liquid level in the reaction tank 10 is low, the fluid in the inner space 101 and the fluid in the outer space 102 can flow inside and outside through the through holes 3012 to adapt to different production needs.

[0062] According to some embodiments of the present invention, reference may be made to Figure 1 and Figure 3 The lower opening 302 includes the lower end opening of the guide tube 30 . In this way, the fluid in the inner space 101 and the fluid in the outer space 102 can flow inside and outside through the lower end opening of the guide tube 30 .

[0063] According to some embodiments of the present invention, reference may be made to Figure 1 and Figure 4 , the guide tube 30 is connected to the inner side wall of the reaction tank 10 through the connecting bracket 50. Here, the outer peripheral wall of the guide tube 30 is connected to the circumferential side wall of the reaction tank 10 through the connecting bracket 50, and the lower end of the guide tube 30 is connected to the bottom wall of the reaction tank 10 through the connecting bracket 50. The connecting bracket 50 can be a connecting plate or a connecting rod, and the structure is relatively simple.

[0064] For example, a plurality of connection brackets 50 connected to the circumferential side wall of the reaction tank 10 are evenly spaced along the circumference of the guide tube 30, and a plurality of connection brackets 50 are evenly spaced along the vertical direction, and a plurality of connection brackets 50 connected to the bottom wall of the reaction tank 10 are evenly spaced along the circumference of the guide tube 30, so as to facilitate the stable installation of the guide tube 30. However, it is not limited thereto, and other arrangements of the connection brackets 50 can also be used to fix the guide tube 30.

[0065] According to some embodiments of the present invention, reference may be made to Figure 1 The inner diameter of the reaction tank 10 is D, which here refers to the diameter of the circumferential inner wall of the reaction tank 10 . The inner diameter of the flow guide tube 30 is L, which here refers to the diameter of the inner space 101 of the flow guide tube 30 . For example, the inner diameter L of the guide tube 30 may be equal to Or any value between any two values. The height of the reaction tank 10 is H, and the height of the upper end of the guide tube 30 from the bottom of the reaction tank 10 is h1, h1 = 0.6H ~ 0.7H, illustratively, h1 can be equal to 0.6H, 0.62H, 0.64H, 0.66H, 0.68H, 0.7H or any value between any two values. The distance between the lower end opening of the guide tube 30 and the bottom wall of the reaction tank 10 is h2, For example, h2 may be equal to Or any value between any two of them.

[0066] The relevant dimensions of the guide tube 30 are within the above range, which can make the flow pattern of the fluid in the inner space 101 and the flow pattern of the fluid in the outer space 102 more consistent. The high consistency of the internal and external flow patterns can form a more uniform flow field, which helps to improve the mixing effect of the materials, helps to evenly distribute the materials in the reaction tank 10, promotes the uniform dispersion of the reaction gas and the suspension of solid particles, makes the reaction more uniform, and thus improves the reaction efficiency. In addition, the consistent flow pattern can also reduce the degree of turbulence inside the fluid, thereby reducing energy loss and increasing the speed and flow rate of fluid circulation, that is, through a reasonable design of the guide tube 30, unnecessary fluid resistance can be reduced, thereby reducing the energy consumption required for stirring.

[0067] According to some embodiments of the present invention, reference may be made to Figure 1The leaching reactor 100 further includes an aeration pipe 40, which is used to introduce the reaction gas into the lower part of the inner space 101. The stirring part 201 includes a stirring blade 202 and a dispersing blade 203. The stirring blade 202 is used to drive the fluid in the inner space 101 to flow upward. The dispersing blade 203 is located below the stirring blade 202. The dispersing blade 203 is located above the outlet end 401 of the aeration pipe 40 and is used to disperse the reaction gas discharged from the outlet end 401 of the aeration pipe 40. For example, when the positive electrode powder is leached, the reaction gas is SO 2 .

[0068] By providing a separate dispersing blade 203, the reaction gas discharged from the aeration pipe 40 is dispersed, which is beneficial to further increase the dispersion degree of the reaction gas, thereby facilitating the reaction rate and reaction speed of the reaction gas. Exemplarily, the dispersing blade 203 may include a connector 2031 and a blade 2032, wherein the connector 2031 is used to connect between the stirring shaft 205 and the blade 2032, the blade 2032 is perpendicular to the horizontal plane, and the connector 2031 is parallel to the horizontal plane. In this way, the structure is simple and the effect of dispersing the gas is good.

[0069] According to some embodiments of the present invention, reference may be made to Figure 1 As shown, the outlet end 401 of the aeration pipe 40 faces a set direction, and the set direction is inclined from top to bottom and in a direction close to the middle of the reaction tank 10, so that the reaction gas discharged from the outlet end 401 of the aeration pipe 40 can flow downward and toward the middle of the reaction tank 10. In the embodiment where the outlet end 401 of the aeration pipe 40 is close to the bottom wall of the reaction tank 10, the outlet end 401 of the aeration pipe 40 can also impact the bottom wall of the reaction tank 10 and reflect to the scattering blade 203. Compared with the opening of the aeration pipe 40 directly facing downward, the outlet end 401 of the aeration pipe 40 in the embodiment of the present application faces a set direction, which can make the gas enter the inner space 101 as much as possible, and the flow path is longer, and it is not easy to interfere with the scattering blade 203 and the stirring blade 202.

[0070] According to some embodiments of the present invention, reference may be made to Figure 1 As shown, the stirring diameter of the scattering blade 203 is D2. Here, the stirring diameter of the scattering blade 203 is twice the distance between the outermost end of the scattering blade 203 and the rotation axis R. The distance between the outlet end 401 of the aeration pipe 40 and the rotation axis R of the stirring part 201 is D3. For example, D3 is equal to Or any value between any two values. That is to say, the outlet end 401 of the aeration pipe 40 is located radially outside the outermost end of the stirring blade 202, so that after the reaction gas flows downward to the lowermost end, it turns back and flows upward to flow to the scattering blade 203, and the position of the flow to the scattering blade 203 is close to the radial outer end of the scattering blade 203, the radial outer end of the scattering blade 203 has a faster rotation linear speed, a better scattering effect, and can greatly increase the contact area between the reaction gas and the fluid.

[0071] For example, a plurality of aeration pipes 40 may be provided at even intervals along the circumference, so as to evenly inject the reaction gas into all locations along the circumference of the reaction tank 10 .

[0072] According to some embodiments of the present invention, reference may be made to Figure 1 The inner diameter of the reaction tank 10 is D, which means that the diameter of the circumferential inner wall of the reaction tank 10 is D, and the distance between the scattering blade 203 and the bottom wall of the reaction tank 10 is h3. Exemplarily, for example, h3 may be equal to The outlet end 401 of the aeration pipe 40 is located between the scattering blade 203 and the bottom of the inner space 101, and the distance h3 between the scattering blade 203 and the bottom wall of the inner space 101 is within the above range, so that the distance between the outlet end 401 of the aeration pipe 40 and the scattering blade 2032 is neither too far nor too close, which is conducive to making the reaction gas reach the outer end of the scattering blade 203 as much as possible, so as to obtain a better gas scattering effect.

[0073] According to some embodiments of the present invention, the gas flow velocity at the outlet end 401 is less than the linear velocity of the outermost end of the scattering blade 203. In this way, the impact of the reaction gas on the scattering blade 203 can be reduced, making the flow of the reaction gas scattered by the scattering blade 203 more controllable.

[0074] In some embodiments, reference may be made to Figure 5 The top of the leaching reactor 100 is provided with a solution inlet 60, a feeding port 70 and other functional pipe openings. The solution inlet 60 is used to introduce the leaching treatment solution into the reaction tank 10, and the feeding port 70 is used to feed the material to be leached into the reaction tank 10. Multiple aeration pipes 40 are all penetrated through the top of the leaching reactor 100 and extend downward into the reaction tank 10. In this way, the leaching reactor 100 has a simple structure and is easy to maintain.

[0075] In some embodiments, the stirring assembly 20 is mounted on the top of the leaching reactor 100 through a bracket 80 so that the stirring assembly 20 can obtain good support. The cross section of the reaction tank 10 perpendicular to the up and down direction is circular, which is convenient for processing and is conducive to uniform flow of fluids everywhere. The side wall and the bottom wall of the reaction tank 10 are connected by an inclined wall surface 103. Under the stirring action, the existence of the inclined wall surface 103 can realize the change of the direction of fluid movement, reduce the mixing blind area, and reduce the solid deposition phenomenon.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A leaching reactor, characterized in that: include: Reaction tank (10); A stirring assembly (20), wherein the stirring assembly (20) comprises a stirring portion (201); a flow guide tube (30), the flow guide tube (30) being arranged in the reaction tank (10), the flow guide tube (30) dividing the reaction tank (10) into an inner space (101) and an outer space (102), the flow guide tube (30) being arranged around the stirring portion (201) and defining the inner space (101), the stirring portion (201) being used to drive the fluid in the inner space (101) to flow upward, the flow guide tube (30) having an upper opening (301) and a lower opening (302), the inner space (101) and the outer space (102) being connected through the upper opening (301) and the lower opening (302); An aeration pipe (40), wherein the aeration pipe (40) is used to introduce reaction gas into the lower part of the inner space (101).

2. The leaching reactor according to claim 1, characterized in that: The stirring portion (201) comprises a stirring blade (202), and the stirring blade (202) comprises a first part (2021) and a second part (2022), and along the rotation direction (F) and from top to bottom, the first part (2021) and the second part (2022) are arranged in sequence at a set angle.

3. The leaching reactor according to claim 2, characterized in that: The stirring diameter of the stirring blade (202) is D1, the inner diameter of the guide tube (30) is L, 4. The leaching reactor according to claim 1, characterized in that: The upper opening (301) includes the upper end opening (3011) of the guide tube (30); and / or, a plurality of through holes (3012) are formed at the upper end portion of the circumferential side wall of the guide tube (30), and the through holes (3012) are arranged at intervals along the circumferential direction, and the upper opening (301) includes the plurality of through holes (3012).

5. The leaching reactor according to claim 1, characterized in that: The flow guide tube (30) is connected to the inner wall of the reaction tank (10) via a connecting bracket (50).

6. The leaching reactor according to claim 1, characterized in that: The inner diameter of the reaction tank (10) is D, the inner diameter of the flow guide tube (30) is L, The height of the reaction tank (10) is H, the height of the upper end of the guide tube (30) from the bottom of the reaction tank (10) is h1, h1=0.6H-0.7H, the distance between the lower end opening of the guide tube (30) and the bottom wall of the reaction tank (10) is h2, and 7. The leaching reactor according to claim 1, characterized in that: The stirring portion (201) comprises a stirring blade (202) and a breaking blade (203), wherein the stirring blade (202) is used to drive the fluid in the inner space (101) to flow upward, and the breaking blade (203) is located below the stirring blade (202), and the breaking blade (203) is located above the outlet end (401) of the aeration pipe (40) and is used to break up the reaction gas.

8. The leaching reactor according to claim 7, characterized in that: The outlet end (401) of the aeration pipe (40) is oriented in a set direction, the set direction is inclined from top to bottom and in a direction close to the middle of the reaction tank (10), the stirring diameter of the agitating blade (203) is D2, the distance between the outlet end (401) of the aeration pipe (40) and the rotation axis (R) of the stirring part (201) is D3, 9. The leaching reactor according to claim 8, characterized in that: The inner diameter of the reaction tank (10) is D, the distance between the scattering blade (203) and the bottom wall of the reaction tank (10) is h3, 10. The leaching reactor according to claim 7, characterized in that: The gas flow velocity at the outlet end (401) is less than the linear velocity of the outermost end of the scattering blade (203).

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