Electrochemical reaction device for laterite-nickel ore leachate

Abstract

The laterite-nickel ore leachate electrochemical reaction device comprises an electrolytic bath, a pole plate assembly and a cleaning assembly, the pole plate assembly comprises a positive electrode plate arranged at the top end of the inner wall of the electrolytic bath and a negative electrode plate arranged at the bottom end of the inner wall of the electrolytic bath, and an arc-shaped reaction face is formed on the top face of the negative electrode plate; the cleaning assembly comprises a screw rod and a driving part, the screw rod is arranged on the upper side of the negative electrode plate, the lower portion of the outer side face of the screw rod is matched with the arc-shaped reaction face, and the driving part is connected with the screw rod to drive the screw rod to rotate so that the outer side face of the screw rod can scrape on the arc-shaped reaction face. Electrochemical solid-liquid separation is matched with the gravity effect, it is guaranteed that sediment and liquid react on the negative electrode plate, meanwhile, the outer side face of the screw rod can scrape on the arc-shaped reaction face, and therefore sediment reactants on the negative electrode plate can be cleaned so as to prevent the sediment reactants from affecting discharging of the negative electrode plate, and the service life of the negative electrode plate is prolonged. The electrochemical reaction efficiency of the laterite-nickel ore is favorably improved.

Description

Technical Field

[0001] The present application relates to the technical field of laterite nickel ore leaching, and in particular to an electrochemical reaction device for laterite nickel ore leaching solution. Background Art

[0002] In the hydrometallurgical process of laterite nickel ore, solid-liquid separation is a critical step. It involves aqueous separation and solid-liquid separation of the reaction materials to produce atmospheric pressure leaching residue and atmospheric pressure leachate. This process is implemented in various hydrometallurgical processes, including but not limited to pressure acid leaching, atmospheric pressure acid leaching, and high-pressure-atmospheric combined acid leaching. In these processes, the purpose of solid-liquid separation is to separate the solution containing dissolved valuable metals from the undissolved solid residue for further processing or recovery. For example, in the pressure acid leaching process, valuable metals such as nickel and cobalt are dissolved along with iron and aluminum minerals using dilute sulfuric acid. Subsequently, solid-liquid separation removes impurities such as iron, aluminum, and silicon into the slag, while selectively releasing nickel and cobalt into the solution. This separation process is crucial for improving metal recovery, reducing impurity levels, and optimizing final product quality.

[0003] Chinese patent CN214830574U discloses an electrochemical solid-liquid separation device for laterite nickel ore, which includes an electrochemical reaction cell, the left end of which is connected to a leachate precipitation tank via an input pipe, and an overflow port connected to the input pipe is opened at the upper right end of the leachate precipitation tank; an electrochemical reactor is fixed to the inside of the electrochemical reaction cell via a fixed bracket, and the electrochemical reactor is connected to an external power supply via a connecting line; a heater and an aerator are fixed to the bottom of the electrochemical reaction cell by bolts.

[0004] However, in the existing electrochemical leaching reaction device for laterite nickel ore, the positive electrode plate and the negative electrode plate are arranged one above the other in the electrochemical reaction cell. Since the precipitate and liquid will deposit and react on the negative electrode plate, a thick layer of precipitated reactants will form on the surface of the negative electrode plate after long-term operation. The precipitated reactants will affect the discharge of the negative electrode plate, thereby affecting the electrochemical reaction efficiency of the laterite nickel ore. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose an electrochemical reaction device for laterite nickel ore leachate to solve the technical problem in the prior art that a thick layer of precipitated reactants will form on the surface of the negative electrode plate after long-term operation, and the precipitated reactants will affect the discharge of the negative electrode plate, thereby affecting the electrochemical reaction efficiency of the laterite nickel ore.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions:

[0007] The present application provides an electrochemical reaction device for laterite nickel ore leachate, comprising: an electrolytic cell, a plate assembly, and a cleaning assembly, wherein the plate assembly comprises a positive electrode plate and a negative electrode plate respectively arranged at the top end of the inner wall of the electrolytic cell, and the top surface of the negative electrode plate forms an arc-shaped reaction surface; the cleaning assembly comprises a spiral rod and a driving member, wherein the spiral rod is arranged on the upper side of the negative electrode plate, and the lower part of the outer surface thereof is engaged with the arc-shaped reaction surface, and the driving member is connected to the spiral rod to drive the spiral rod to rotate so that the outer surface of the spiral rod scrapes the arc-shaped reaction surface.

[0008] In some embodiments, the lower side of one end of the electrolytic cell protrudes outward to form a solid discharge portion, the solid discharge portion is located at the end of the negative electrode plate, and the bottom end of the solid discharge portion is connected to a slag discharge pipe; a material guide ramp is provided in the solid discharge portion, and the material guide ramp has an inclined surface extending obliquely from the inner wall of the electrolytic cell to the outer edge of the pipe mouth of the slag discharge pipe.

[0009] In some embodiments, the screw includes a rotating shaft and propeller blades, the rotating shaft being disposed transversely within the electrolytic cell, and the propeller blades being arranged spirally along the outer side of the rotating shaft. The laterite nickel ore leachate electrochemical reaction device further includes a heater, the heater being disposed within a shaft groove within the rotating shaft and arranged sequentially along the length of the rotating shaft. The drive member includes a motor, the motor being mounted at one end of the electrolytic cell, the drive shaft of the motor being connected to one end of the rotating shaft. A fixed seat is disposed at the other end of the electrolytic cell, the other end of the rotating shaft being connected to the fixed seat via a bearing. One end of the heater is mounted on the fixed seat, and the other end is connected to the wall of the shaft groove via a bearing.

[0010] In some embodiments, the electrolytic cell is a cylindrical structure and is arranged horizontally or inclined. The positive electrode plate and the negative electrode plate are both configured as arc-shaped plate structures and are symmetrically arranged at the upper and lower ends of the inner wall of the electrolytic cell, respectively, and are arranged in close contact with the inner wall of the electrolytic cell. The bottom surface of the positive electrode plate is aligned with the upper portion of the outer surface of the spiral rod. The electrode plate assembly also includes two arc-shaped connection frames, which are respectively arranged on both sides of the positive electrode plate, and their two sides are respectively spliced ​​and connected to one side of the positive electrode plate and one side of the negative electrode plate.

[0011] In some embodiments, a circulating liquid inlet pipe and a circulating liquid outlet pipe are respectively provided at both ends of the electrolytic cell, the circulating liquid inlet pipe is located at the lower side of one end of the electrolytic cell, and the circulating liquid outlet pipe is located at the upper side of the other end of the electrolytic cell.

[0012] In some embodiments, the electrolytic cell is further provided with an additive tube and a pressure tube.

[0013] Compared with the prior art, the electrochemical reaction device for laterite nickel ore leachate provided in the present application, by providing a positive electrode plate at the top of the inner wall of the electrolytic cell and a negative electrode plate at the bottom, coordinates the electrochemical solid-liquid separation with the action of gravity, ensuring that the precipitate and liquid react on the negative electrode plate; at the same time, the top surface of the negative electrode plate is set as an arc-shaped reaction surface. When the driving member drives the spiral rod to rotate, the outer side surface of the spiral rod can scrape on the arc-shaped reaction surface, thereby achieving the cleaning of the precipitated reactants on the negative electrode plate to prevent the precipitated reactants from affecting the discharge of the negative electrode plate, which is beneficial to improving the electrochemical reaction efficiency of the laterite nickel ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall front cross-sectional structure of the electrochemical reaction device for laterite nickel ore leachate provided in an embodiment of the present application;

[0015] Figure 2 This is a side cross-sectional structural diagram of the electrode plate assembly installation of the laterite nickel ore leachate electrochemical reaction device provided in an embodiment of the present application;

[0016] Figure 3 1 is a schematic side cross-sectional structural diagram of a solid discharge portion of an electrochemical reaction device for laterite nickel ore leachate provided in an embodiment of the present application;

[0017] Figure 4 yes Figure 1 Enlarged view of point A in the middle.

[0018] Description of reference numerals:

[0019] 1. Electrolytic cell; 11. Solid discharge section; 12. Slag discharge pipe; 13. Material guide ramp; 14. Circulating liquid inlet pipe; 15. Circulating liquid outlet pipe; 16. Additive pipe; 17. Pressurizing pipe;

[0020] 2. Plate assembly; 21. Positive electrode plate; 22. Negative electrode plate; 221. Arc-shaped reaction surface; 23. Connection frame;

[0021] 3. Cleaning assembly; 31. Screw rod; 311. Rotating shaft; 312. Propeller blade; 32. Driving member;

[0022] 4. Heater; 5. Fixed seat. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0024] In order to solve the technical problem that a thick layer of precipitated reactants will form on the surface of the negative electrode plate after long-term operation, and the precipitated reactants will affect the discharge of the negative electrode plate, thereby affecting the electrochemical reaction efficiency of laterite nickel ore, the present application provides an electrochemical reaction device for laterite nickel ore leachate, which coordinates electrochemical solid-liquid separation with gravity to ensure that the precipitate and liquid react on the negative electrode plate. At the same time, the outer side surface of the spiral rod can scrape on the arc-shaped reaction surface, thereby cleaning the precipitated reactants on the negative electrode plate to prevent the precipitated reactants from affecting the discharge of the negative electrode plate, which is beneficial to improving the electrochemical reaction efficiency of laterite nickel ore.

[0025] See also Figure 1 and Figure 2 The electrochemical reaction device for laterite nickel ore leachate includes: an electrolytic cell 1, a plate assembly 2 and a cleaning assembly 3, wherein the plate assembly 2 includes a positive electrode plate 21 and a negative electrode plate 22 respectively arranged at the top and bottom ends of the inner wall of the electrolytic cell 1, and the top surface of the negative electrode plate 22 forms an arc-shaped reaction surface 221; the cleaning assembly 3 includes a spiral rod 31 and a driving member 32, wherein the spiral rod 31 is arranged on the upper side of the negative electrode plate 22, and the lower part of the outer surface thereof is in engagement with the arc-shaped reaction surface 221, and the driving member 32 is connected to the spiral rod 31 to drive the spiral rod 31 to rotate so that the outer surface of the spiral rod 31 scrapes on the arc-shaped reaction surface 221.

[0026] In the present application, by respectively arranging the positive electrode plate 21 and the negative electrode plate 22 at the top and the bottom of the inner wall of the electrolytic cell 1, the electrochemical solid-liquid separation is coordinated with the action of gravity to ensure that the precipitate and the liquid react on the negative electrode plate 22; at the same time, the top surface of the negative electrode plate 22 is set to an arc-shaped reaction surface 221. When the driving member 32 drives the spiral rod 31 to rotate, the outer side surface of the spiral rod 31 can scrape on the arc-shaped reaction surface 221, thereby realizing the cleaning of the precipitated reactants on the negative electrode plate 22.

[0027] Under the cleaning of the cleaning assembly 3, the outer side of the spiral rod 31 scrapes on the arc-shaped reaction surface 221 to separate the reactants from the negative electrode plate 22. At the same time, the spiral rod 31 can also push the solid reactants to one end of the electrolytic cell 1. In order to clean out the solid reactants and prevent them from accumulating in large quantities in the electrolytic cell 1, in this embodiment, please refer to Figure 1 and Figure 2 The lower side of one end of the electrolytic cell 1 protrudes outward to form a downwardly protruding solid discharge portion 11. The solid discharge portion 11 is located at the end of the negative electrode plate 22 and is used to accommodate the solid reactants pushed out by the spiral rod 31. The bottom end of the solid discharge portion 11 is connected to a slag discharge pipe 12. The valve on the slag discharge pipe 12 can be opened to discharge the solid reactants.

[0028] In one embodiment, see Figure 1 、 Figure 2 and Figure 4 A material guide ramp 13 is also provided in the solid discharge part 11. The material guide ramp 13 is provided at the feed end of the slag discharge pipe 12. It has an inclined surface extending obliquely from the inner wall of the electrolytic cell 1 to the outer edge of the pipe mouth of the slag discharge pipe 12, so that a channel that gradually shrinks from top to bottom is formed in the solid discharge part 11. The size of the channel on the lower side is equal to the size of the pipe mouth of the slag discharge pipe 12, so that the solid reactants precipitated at the end of the electrolytic cell 1 are precipitated in the solid discharge part 11. When the slag discharge pipe 12 is opened, the solid reactants are guided to the slag discharge pipe 12 through the inclined surface.

[0029] Preferably, in this embodiment, see Figure 1 A circulating liquid inlet pipe 14 and a circulating liquid outlet pipe 15 are respectively provided at both ends of the electrolytic cell 1. The circulating liquid inlet pipe 14 is located at the lower side of one end of the electrolytic cell 1, and the circulating liquid outlet pipe 15 is located at the upper side of the other end of the electrolytic cell 1. The leachate after de-ironization and aluminum removal can be input into the electrolytic cell 1 through the circulating liquid inlet pipe 14, and the slurry can be output through the circulating liquid outlet pipe 15. By arranging the circulating liquid outlet pipe 15 at the upper side of the electrolytic cell 1, the solid reactants in the reacted slurry will naturally settle during discharge and fall into the solid discharge portion 11, and the leachate can be smoothly discharged through the circulating liquid outlet pipe 15.

[0030] Furthermore, in one embodiment, the electrolytic cell 1 is also provided with an additive tube 16 and a pressure tube 17 , and additives can be added to the electrolytic cell 1 through the additive tube 16 , and the electrolytic cell 1 can be inflated and pressurized through the pressure tube 17 to control the pressure inside the electrolytic cell 1 .

[0031] Preferably, in this embodiment, see Figure 1 A heater 4 is also provided for heating the slurry in the electrolytic cell 1 to provide a suitable reaction temperature for the electrochemical reaction. To enhance the heating effect, the screw 31 includes a rotating shaft 311 and propeller blades 312. The rotating shaft 311 is disposed transversely within the electrolytic cell 1, and the propeller blades 312 are arranged in a spiral pattern along the outer side of the rotating shaft 311. The heaters 4 are disposed in a shaft groove within the rotating shaft 311 and are arranged sequentially along the length of the rotating shaft 311. This allows the heaters 4 to transfer heat through the rotating shaft 311, ensuring uniform heating of the slurry.

[0032] Furthermore, the driving member 32 includes a motor, which is installed at one end of the electrolytic cell 1 , and its driving shaft is connected to one end of the rotating shaft 311 . The motor can drive the rotating shaft 311 to rotate, driving the propeller blades 312 to rotate around the rotating shaft 311 .

[0033] Specifically, a fixed seat 5 is fixed to the other end of the electrolytic cell 1 by bolts, a bearing is sleeved on the outer side of the end of the rotating shaft 311 away from the motor, and the fixed seat 5 is connected through the bearing. One end of the heater 4 is fixedly mounted on the fixed seat 5, and the other end is rotatably connected to the groove wall of the shaft groove through a bearing.

[0034] It is understandable that in other possible embodiments, a temperature sensor and a pressure sensor may be installed in the electrolytic cell 1 to respectively cooperate with the heater 4 and the pressurizing tube 17 to control the temperature and pressure inside the electrolytic cell 1 .

[0035] Preferably, in this embodiment, see Figures 1 to 3 The electrolytic cell 1 is cylindrical and horizontally arranged. The positive electrode plate 21 and the negative electrode plate 22 are both configured as arc-shaped plates and are symmetrically arranged at the upper and lower ends of the inner wall of the electrolytic cell 1. One positive electrode plate 21 and one negative electrode plate 22 are each provided, extending along the length of the electrolytic cell 1. The positive electrode plate 21 and the negative electrode plate 22 are both fixedly mounted on the inner wall of the electrolytic cell 1, and the bottom surface of the positive electrode plate 21 is aligned with the upper portion of the outer surface of the spiral rod 31.

[0036] During implementation, the spiral rod 31 can synchronously scrape the bottom surface of the positive electrode plate 21 when rotating, so as to prevent solid matter or scale from remaining on the bottom surface of the positive electrode plate 21 .

[0037] Further, in some embodiments, see Figure 2 The electrode assembly 2 also includes two arc-shaped connecting frames 23, which are respectively arranged on both sides of the positive electrode plate 21, and their two sides are respectively spliced ​​and connected with one side of the positive electrode plate 21 and one side of the negative electrode plate 22, so that the positive electrode plate 21 and the negative electrode plate 22 are connected through the two arc-shaped connecting frames 23. The two arc-shaped connecting frames 23 and the positive electrode plate 21 and the negative electrode plate 22 form a cylindrical structure, which can prevent dirt from accumulating inside the electrolytic cell 1.

[0038] Of course, in other possible embodiments, the electrolytic cell 1 can also be arranged to be laterally inclined, and the solid discharge portion 11 is arranged at the lower end of the electrolytic cell 1, so that the solid reactants can be transported to the solid discharge portion 11 below by using the screw rod 31. The positive electrode plate 21 and the negative electrode plate 22 can also be provided in plurality, and arranged in sequence along the length direction of the electrolytic cell 1. In order to avoid residual reactants between the multiple positive electrode plates 21 or the multiple negative electrode plates 22, the multiple positive electrode plates 21 and the multiple negative electrode plates 22 have the same thickness, and the adjacent two positive electrode plates 21 and the adjacent two negative electrode plates 22 are seamlessly spliced.

[0039] Working principle: During implementation, the leachate after iron and aluminum removal enters the interior of the electrolytic cell 1 through the circulating liquid inlet pipe 14, additives are added to the electrolytic cell 1 through the additive pipe 16, and the electrolytic cell 1 is inflated and pressurized through the pressure pipe 17. The slurry flows in sequence along the spiral chamber separated by the spiral rod 31, and fully undergoes electrochemical catalytic reaction under the action of the positive electrode plate 21 and the negative electrode plate 22, so that the precipitate and liquid in the leachate are effectively separated under the dual action of electrochemical catalysis and gravity. After a period of time, the spiral rod 31 is driven by a motor to rotate, stirring the electrolyte in the kettle body, so that the liquid further reacts. At the same time, under the stirring of the spiral rod 31, the propeller blade 312 is scraped on the negative electrode plate 22, and the reactants are transported to the solid discharge part 11 of the electrolytic cell 1, so as to clean the precipitated reactants on the negative electrode plate 22.

[0040] The present application provides an electrolytic cell 1, a plate assembly 2, and a cleaning assembly 3, and provides a positive electrode plate 21 at the top of the inner wall of the electrolytic cell 1 and a negative electrode plate 22 at the bottom, so that the electrochemical solid-liquid separation is coordinated with the action of gravity to ensure that the precipitate and the liquid react on the negative electrode plate 22; at the same time, the top surface of the negative electrode plate 22 is set to an arc-shaped reaction surface 221. When the driving member 32 drives the spiral rod 31 to rotate, the outer side surface of the spiral rod 31 can scrape on the arc-shaped reaction surface 221, thereby achieving the cleaning of the precipitated reactants on the negative electrode plate 22 to prevent the precipitated reactants from affecting the discharge of the negative electrode plate 22, which is beneficial to improving the electrochemical reaction efficiency of laterite nickel ore.

[0041] The specific implementation methods of the present application described above do not limit the scope of protection of the present application. Any other corresponding changes and modifications made based on the technical concept of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. An electrochemical reaction device for laterite nickel ore leachate, characterized in that: include: electrolytic cell; a plate assembly, the plate assembly comprising a positive electrode plate and a negative electrode plate respectively arranged at the top end of the inner wall of the electrolytic cell, wherein the top surface of the negative electrode plate forms an arc-shaped reaction surface; and A cleaning assembly includes a spiral rod and a driving member, wherein the spiral rod is arranged on the upper side of the negative electrode plate, and the lower part of its outer side surface is engaged with the arc-shaped reaction surface. The driving member is connected to the spiral rod to drive the spiral rod to rotate so that the outer side surface of the spiral rod scrapes the arc-shaped reaction surface.

2. The electrochemical reaction device for laterite nickel ore leachate according to claim 1, characterized in that: The lower side of one end of the electrolytic cell protrudes outward to form a solid discharge portion, which is located at the end of the negative electrode plate. The bottom end of the solid discharge portion is connected to a slag discharge pipe.

3. The electrochemical reaction device for laterite nickel ore leachate according to claim 2, characterized in that: A material guiding ramp is provided in the solid discharge portion, and the material guiding ramp has an inclined surface extending obliquely from the inner wall of the electrolytic cell toward the outer edge of the pipe opening of the slag discharge pipe.

4. The electrochemical reaction device for laterite nickel ore leachate according to claim 1, characterized in that: The spiral rod includes a rotating shaft and propeller blades, the rotating shaft is transversely arranged inside the electrolytic cell, and the propeller blades are spirally arranged along the outer side of the rotating shaft; The laterite nickel ore leachate electrochemical reaction device further includes a heater, which is disposed in a shaft groove inside the rotating shaft and arranged sequentially along the length direction of the rotating shaft.

5. The electrochemical reaction device for laterite nickel ore leachate according to claim 4, characterized in that: The driving member includes a motor, which is installed at one end of the electrolytic cell and has a drive shaft connected to one end of the rotating shaft; A fixing seat is provided at the other end of the electrolytic cell, and the other end of the rotating shaft is connected to the fixing seat through a bearing. One end of the heater is installed on the fixing seat, and the other end is connected to the groove wall of the shaft groove through a bearing.

6. The electrochemical reaction device for laterite nickel ore leachate according to claim 1, characterized in that: The electrolytic cell is a cylindrical structure and is arranged horizontally or inclined.

7. The electrochemical reaction device for laterite nickel ore leachate according to claim 6, characterized in that: The positive electrode plate and the negative electrode plate are both configured as arc-shaped plate structures and are symmetrically arranged at the upper and lower ends of the inner wall of the electrolytic cell, respectively, and are arranged in close contact with the inner wall of the electrolytic cell. The bottom surface of the positive electrode plate fits with the upper part of the outer side surface of the spiral rod.

8. The electrochemical reaction device for laterite nickel ore leachate according to claim 7, characterized in that: The electrode plate assembly further includes two arc-shaped connection frames, which are respectively arranged on both sides of the positive electrode plate, and whose two sides are respectively spliced ​​and connected with one side of the positive electrode plate and one side of the negative electrode plate.

9. The electrochemical reaction device for laterite nickel ore leachate according to claim 1, characterized in that: A circulating liquid inlet pipe and a circulating liquid outlet pipe are respectively provided at both ends of the electrolytic cell. The circulating liquid inlet pipe is located at the lower side of one end of the electrolytic cell, and the circulating liquid outlet pipe is located at the upper side of the other end of the electrolytic cell.

10. The electrochemical reaction device for laterite nickel ore leachate according to claim 1, characterized in that: The electrolytic cell is also provided with an additive tube and a pressure tube.

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