Electrochemical reaction device for laterite nickel ore leaching solution

Abstract

Disclosed in the present application is an electrochemical reaction device for a laterite nickel ore leaching solution. The electrochemical reaction device comprises: an electrolytic cell (1), an electrode plate assembly (2), and a cleaning assembly (3), wherein the electrode plate assembly (2) comprises a positive electrode plate (21) and a negative electrode plate (22) that are respectively arranged at the top end and the bottom end of an inner wall of the electrolytic cell (1), an arc-shaped reaction surface (221) being formed on the top surface of the negative electrode plate (22); and the cleaning assembly (3) comprises a screw rod (31) and a driving member (32), the screw rod (31) being arranged on the upper side of the negative electrode plate (22), with the lower part of the outer side surface of the screw rod matching the arc-shaped reaction surface, and the driving member (32) being connected to the screw rod (31) for driving the screw rod (32) to rotate, such that the outer side surface of the screw rod scrapes across the arc-shaped reaction surface (221). In the present application, it is ensured that precipitates and liquid react on the negative electrode plate by means of the cooperation of electrochemical solid-liquid separation and gravity action; moreover, the outer side surface of the screw rod can scrape across the arc-shaped reaction surface, thereby cleaning up precipitated reactants on the negative electrode plate, preventing the precipitated reactants from affecting the discharge of the negative electrode plate, and thus facilitating the improvement of the electrochemical reaction efficiency of laterite nickel ore.

Description

Electrochemical reaction device for laterite nickel ore leaching solution TECHNICAL FIELD

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

[0002] In the hydrometallurgical process of laterite nickel ore, solid-liquid feed separation is an important step, which involves water-soluble separation and solid-liquid separation of reaction materials to obtain atmospheric leaching residue and atmospheric leaching solution. This process is reflected in various hydrometallurgical processes, including but not limited to pressure acid leaching process, atmospheric acid leaching process, and high-pressure-atmospheric combined acid leaching process. In these processes, the purpose of solid-liquid separation is to separate the solution dissolved with 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 together with iron, aluminum minerals by using dilute sulfuric acid, and then iron, aluminum and silicon impurities are separated into the residue by solid-liquid separation, while nickel and cobalt are selectively separated into the solution. This separation process is crucial for improving metal recovery rate, reducing impurity content, and optimizing the quality of the final product.

[0003] Chinese patent CN214830574U discloses an electrochemical solid-liquid separation device for laterite nickel ore, which includes an electrochemical reaction tank, the left end of the electrochemical reaction tank is connected with a leaching solution sedimentation tank through an input pipeline, and the right side of the leaching solution sedimentation tank is provided with an overflow port communicated with the input pipeline; an electrochemical reactor is fixed in the inner side of the electrochemical reaction tank through a fixed support, and the electrochemical reactor is connected with an external power supply through a connecting line; a heater and an aerator are fixed at the bottom of the electrochemical reaction tank through 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 vertically in the electrochemical reaction tank. Since the precipitate and the liquid will deposit and react on the negative electrode plate, a thick layer of precipitate reaction product will form on the surface of the negative electrode plate after a long time of work, which will affect the discharge of the negative electrode plate and thus affect the electrochemical reaction efficiency of the laterite nickel ore.

[0005] SUMMARY

[0006] The present application aims to overcome the above technical deficiencies and provides an electrochemical reaction device for laterite nickel ore leaching solution, which solves the technical problem that in the prior art, a thick layer of precipitate reaction product will form on the surface of the negative electrode plate after a long time of work, which will affect the discharge of the negative electrode plate and thus affect the electrochemical reaction efficiency of the laterite nickel ore.

[0007] To achieve the above technical purpose, the following technical scheme is adopted in the present application:

[0008] The application provides a kind of laterite nickel ore leaching solution electrochemical reaction device, comprising: electrolytic cell, polar plate assembly and cleaning assembly, the polar plate assembly includes respectively being arranged in the top end of the inner wall of the electrolytic cell positive electrode plate and the bottom end of negative electrode plate, the top surface of the negative electrode plate forms a curved reaction surface;The cleaning assembly includes screw rod and driving element, the screw rod is arranged on the upper side of the negative electrode plate, the lower part of its outer side surface is consistent with the curved reaction surface, the driving element is connected with the screw rod, to drive screw rod rotation makes the outer side surface of screw rod scrape on the curved reaction surface.

[0009] In some embodiments, one end of the electrolytic cell is protruded to the outside of the lower side to form a solid discharge part, the solid discharge part is located at the end of the negative electrode plate, and the bottom end of the solid discharge part is connected with a slag discharge pipe;A guide inclined table is arranged in the solid discharge part, and the guide inclined table has an inclined surface extending obliquely from the inner wall of the electrolytic cell to the outer edge of the pipe opening of the slag discharge pipe.

[0010] In some embodiments, the screw rod includes a rotating shaft and a helical blade, the rotating shaft is transversely arranged in the interior of the electrolytic cell, and the helical blade is helically arranged along the outer side of the rotating shaft;The laterite nickel ore leaching solution electrochemical reaction device further includes a heater, the heater is arranged in the shaft groove in the interior of the rotating shaft and is sequentially arranged along the length direction of the rotating shaft. The driving element includes a motor, the motor is installed at one end of the electrolytic cell, the driving shaft of the motor is connected with one end of the rotating shaft, a fixing seat is arranged at the other end of the electrolytic cell, the other end of the rotating shaft is connected with the fixing seat through a bearing, one end of the heater is installed on the fixing seat, and the other end of the heater is connected with the groove wall of the shaft groove through a bearing.

[0011] In some embodiments, the electrolytic cell is in a cylindrical structure and is horizontally or obliquely arranged transversely. The positive electrode plate and the negative electrode plate are both arranged in an arc-shaped plate structure and are symmetrically arranged at the upper and lower ends of the inner wall of the electrolytic cell and are arranged in close contact with the inner wall of the electrolytic cell, and the bottom surface of the positive electrode plate is consistent with the upper part of the outer side surface of the screw rod. The polar plate assembly further includes two arc-shaped connecting frames, the two connecting frames are arranged on both sides of the positive electrode plate and are respectively connected with one side of the positive electrode plate and one side of the negative electrode plate.

[0012] In some embodiments, the electrolytic cell is provided with a circulating liquid inlet pipe and a circulating liquid outlet pipe at two ends respectively, 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.

[0013] In some embodiments, the electrolytic cell is further provided with an additive pipe and a pressurizing pipe.

[0014] Compared with the prior art, the laterite nickel ore leaching solution electrochemical reaction device provided by the application, through the positive electrode plate arranged at the top end of the inner wall of the electrolytic cell and the negative electrode plate arranged at the bottom end, the electrochemical solid-liquid separation is matched with the gravity effect to ensure that the precipitate and the liquid react on the negative electrode plate; at the same time, the top surface of the negative electrode plate is arranged as an arc-shaped reaction surface, when the driving member drives the screw rod to rotate, the outer surface of the screw rod can be scraped on the arc-shaped reaction surface, thereby realizing the cleaning of the precipitated reactants on the negative electrode plate, so as to prevent the precipitated reactants from affecting the discharge of the negative electrode plate, and the electrochemical reaction efficiency of the laterite nickel ore is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a schematic diagram of the overall front view cross-sectional structure of the laterite nickel ore leaching solution electrochemical reaction device provided by the embodiment of the application;

[0016] Fig. 2 is a schematic diagram of the side view cross-sectional structure of the installation of the electrode plate assembly of the laterite nickel ore leaching solution electrochemical reaction device provided by the embodiment of the application;

[0017] Fig. 3 is a schematic diagram of the side view cross-sectional structure of the solid discharge part of the laterite nickel ore leaching solution electrochemical reaction device provided by the embodiment of the application;

[0018] Fig. 4 is an enlarged view of A in Fig. 1.

[0019] BRIEF DESCRIPTION OF DRAWINGS:

[0020] 1, electrolytic cell; 11, solid discharge part; 12, slag discharge pipe; 13, material guide inclined table; 14, circulating liquid inlet pipe; 15, circulating liquid outlet pipe; 16, additive pipe; 17, pressurizing pipe;

[0021] 2, electrode plate assembly; 21, positive electrode plate; 22, negative electrode plate; 221, arc-shaped reaction surface; 23, connecting frame;

[0022] 3, cleaning assembly; 31, screw rod; 311, rotating shaft; 312, propeller blade; 32, driving member;

[0023] 4, heater; 5, fixed seat. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the application more clear and explicit, the application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0025] In order to solve the technical problem that a thick layer of precipitated reactants is formed on the surface of the negative electrode plate after long time work, the precipitated reactants affect the discharge of the negative electrode plate, and thus affect the electrochemical reaction efficiency of the laterite nickel ore, the application provides a laterite nickel ore leaching solution electrochemical reaction device, which combines electrochemical solid-liquid separation with gravity effect, ensures that the precipitates and liquid react on the negative electrode plate, and the outer side surface of the screw rod can be scraped on the arc-shaped reaction surface, so that the precipitated reactants on the negative electrode plate are cleaned, so as to prevent the precipitated reactants from affecting the discharge of the negative electrode plate, and the electrochemical reaction efficiency of the laterite nickel ore is improved.

[0026] Referring to FIGS. 1 and 2, the laterite nickel ore leaching solution electrochemical reaction device comprises an electrolytic cell 1, an electrode plate assembly 2, and a cleaning assembly 3. The electrode plate assembly 2 comprises a positive electrode plate 21 and a negative electrode plate 22 arranged at the top end and the bottom end of the inner wall of the electrolytic cell 1 respectively. The top surface of the negative electrode plate 22 forms an arc-shaped reaction surface 221. The cleaning assembly 3 comprises a screw rod 31 and a driving member 32. The screw rod 31 is arranged on the upper side of the negative electrode plate 22, and the lower part of the outer side surface thereof is fitted with the arc-shaped reaction surface 221. The driving member 32 is connected with the screw rod 31 to drive the rotation of the screw rod 31 so that the outer side surface of the screw rod 31 is scraped on the arc-shaped reaction surface 221.

[0027] In the application, the positive electrode plate 21 and the negative electrode plate 22 arranged at the top end and the bottom end of the inner wall of the electrolytic cell 1 respectively, so that the electrochemical solid-liquid separation is combined with the gravity effect, and the reaction of the precipitates and liquid on the negative electrode plate 22 is ensured. Meanwhile, the top surface of the negative electrode plate 22 is arranged as the arc-shaped reaction surface 221. When the driving member 32 drives the rotation of the screw rod 31, the outer side surface of the screw rod 31 can be scraped on the arc-shaped reaction surface 221, so that the cleaning of the precipitated reactants on the negative electrode plate 22 is realized.

[0028] Under the cleaning of the cleaning assembly 3, the outer side surface of the screw rod 31 is scraped on the arc-shaped reaction surface 221, so that the reactants are separated from the negative electrode plate 22. Meanwhile, the screw rod 31 can also push the solid reactants to one end of the electrolytic cell 1. In order to clean the solid reactants and prevent them from accumulating in the electrolytic cell 1, in the embodiment, referring to FIGS. 1 and 2, the lower side of one end of the electrolytic cell 1 is outwardly protruded to form a downward protruding solid discharge part 11. The solid discharge part 11 is located at the end of the negative electrode plate 22 and is used to accommodate the solid reactants pushed out by the screw rod 31. The bottom end of the solid discharge part 11 is connected with a slag discharge pipe 12. The valve on the slag discharge pipe 12 can be opened to discharge the solid reactants.

[0029] In one of the embodiments, referring to FIG. 1, FIG. 2 and FIG. 4, a guide inclined platform 13 is arranged in the solid discharge part 11, which is arranged at the feeding end of the slag discharge pipe 12, and has an inclined surface extending from the inner wall of the electrolytic tank 1 to the outer edge of the nozzle of the slag discharge pipe 12, so that a channel gradually narrowing from top to bottom is formed in the solid discharge part 11, and the size of the channel at the lower side is equal to the size of the nozzle of the slag discharge pipe 12, so that the solid reactants precipitated at the end of the electrolytic tank 1 are precipitated in the solid discharge part 11, and when the slag discharge pipe 12 is opened, the solid reactants are guided to the slag discharge pipe 12 through the inclined surface.

[0030] Preferably, in the present embodiment, referring to FIG. 1, the electrolytic tank 1 is provided with a circulating liquid inlet pipe 14 at the lower side of one end of the electrolytic tank 1 and a circulating liquid outlet pipe 15 at the upper side of the other end of the electrolytic tank 1. The leaching solution after removing iron aluminum can be input into the electrolytic tank 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 tank 1, the solid reactants in the reacted slurry can naturally precipitate and fall into the solid discharge part 11 during discharge, and the leaching solution can be smoothly discharged through the circulating liquid outlet pipe 15.

[0031] Further, in one of the embodiments, the electrolytic tank 1 is further provided with an additive pipe 16 and a pressurizing pipe 17, so that additives can be added into the electrolytic tank 1 through the additive pipe 16, and the electrolytic tank 1 can be pressurized by air through the pressurizing pipe 17 to control the pressure inside the electrolytic tank 1.

[0032] Preferably, in the present embodiment, referring to FIG. 1, a heater 4 is further arranged to heat the slurry in the electrolytic tank 1 to provide a suitable reaction temperature for the electrochemical reaction. In order to improve the heating effect, the screw rod 31 includes a rotating shaft 311 arranged transversely in the electrolytic tank 1 and screw blades 312 arranged spirally along the outer side of the rotating shaft 311, and the heater 4 is arranged in the shaft groove inside the rotating shaft 311 and arranged sequentially along the length direction of the rotating shaft 311. The heater 4 can transmit heat through the rotating shaft 311 to ensure uniform heating of the slurry.

[0033] Further, the driving member 32 includes a motor mounted at one end of the electrolytic tank 1, and the driving shaft of the motor is connected to one end of the rotating shaft 311, so that the motor can drive the rotating shaft 311 to rotate and drive the screw blades 312 to rotate around the rotating shaft 311.

[0034] Specifically, the other end of the electrolytic tank 1 is fixedly installed with a fixed seat 5 through a bolt, the outer side of the end of the rotating shaft 311 away from the motor is sleeved with a bearing, the fixed seat 5 is connected through the bearing, one end of the heater 4 is fixedly installed on the fixed seat 5, and the other end is rotationally connected with the groove wall of the shaft groove through a bearing.

[0035] It can be understood that in other possible embodiments, temperature sensors and pressure sensors can also be installed in the electrolytic tank 1 to cooperate with the heater 4 and the pressurizing pipe 17 respectively to control the temperature and pressure inside the electrolytic tank 1.

[0036] Preferably, in the embodiment, referring to FIGS. 1-3, the electrolytic tank 1 is in a cylindrical structure and is horizontally arranged. The positive electrode plate 21 and the negative electrode plate 22 are both arranged in an arc-shaped plate structure and are symmetrically arranged at the upper and lower ends of the inner wall of the electrolytic tank 1. One positive electrode plate 21 and one negative electrode plate 22 are arranged along the length direction of the electrolytic tank 1. The positive electrode plate 21 and the negative electrode plate 22 are fixedly installed on the inner wall of the electrolytic tank 1 and are in abutment. The bottom surface of the positive electrode plate 21 is in abutment with the upper part of the outer side surface of the screw rod 31.

[0037] In implementation, the bottom surface of the positive electrode plate 21 can be scraped synchronously when the screw rod 31 rotates, so as to avoid solid substances or scale remaining on the bottom surface of the positive electrode plate 21.

[0038] Further, in some embodiments, referring to FIG. 2, the electrode plate assembly 2 further comprises two arc-shaped connecting frames 23 arranged on the two sides of the positive electrode plate 21. The two arc-shaped connecting frames 23 are respectively in abutment connection with one side of the positive electrode plate 21 and one side of the negative electrode plate 22. 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, the positive electrode plate 21 and the negative electrode plate 22 form a cylindrical structure, which can prevent dirt from being hidden inside the electrolytic tank 1.

[0039] Of course, in other possible embodiments, the electrolytic tank 1 can also be horizontally and obliquely arranged. The solid discharge part 11 is arranged at the lower end of the electrolytic tank 1, so that the solid reactants can be transported to the solid discharge part 11 below by the screw rod 31. The positive electrode plate 21 and the negative electrode plate 22 can also be arranged in multiple numbers and arranged in sequence along the length direction of the electrolytic tank 1. In order to avoid residual reactants between multiple positive electrode plates 21 or multiple negative electrode plates 22, the multiple positive electrode plates 21 and the multiple negative electrode plates 22 have the same thickness and are seamlessly spliced between adjacent two positive electrode plates 21 and adjacent two negative electrode plates 22.

[0040] Working principle: in implementation, the leaching solution after removing iron and aluminum enters the inside of the electrolytic tank 1 through the circulating liquid inlet pipe 14, the additives are added into the electrolytic tank 1 through the additive pipe 16, the electrolytic tank 1 is pressurized through the pressurizing pipe 17, the slurry flows along the spiral cavities separated by the spiral rod 31 in turn, and the electrochemical catalytic reaction is fully carried out under the action of the positive electrode plate 21 and the negative electrode plate 22, so that the precipitate and the liquid in the leaching solution are effectively separated under the double action of electrochemical catalysis and gravity, after a period of time, the motor drives the spiral rod 31 to rotate, agitates the electrolyte in the kettle body, and makes the liquid further react, at the same time, under the agitation of the spiral rod 31, the propeller blade 312 scrapes on the negative electrode plate 22, and the reactants are transported to the solid discharge part 11 of the electrolytic tank 1, so that the cleaning of the precipitated reactants on the negative electrode plate 22 is realized.

[0041] The electrolytic tank 1, the electrode plate assembly 2 and the cleaning assembly 3 are arranged, the positive electrode plate 21 is arranged at the top end of the inner wall of the electrolytic tank 1, and the negative electrode plate 22 is arranged at the bottom end, so that the electrochemical solid-liquid separation is matched with the gravity effect, the precipitate and the liquid are reacted on the negative electrode plate 22, at the same time, the top surface of the negative electrode plate 22 is arranged as an arc-shaped reaction surface 221, when the driving member 32 drives the spiral rod 31 to rotate, the outer surface of the spiral rod 31 can scrape on the arc-shaped reaction surface 221, so that the cleaning of the precipitated reactants on the negative electrode plate 22 is realized, so as to prevent the precipitated reactants from affecting the discharge of the negative electrode plate 22, and the electrochemical reaction efficiency of the laterite nickel ore is improved.

[0042] The specific embodiments of the application described above do not constitute a limitation on the protection scope of the application. Any various other corresponding changes and modifications made according to the technical concept of the application should be included in the protection scope of the claims of the application.

Claims

1. An electrochemical reactor for laterite nickel ore leachate, characterized by, The application relates to a red mud nickel ore leaching solution electrochemical reaction device. The device comprises an electrolytic cell, a positive electrode plate arranged at the top end of the inner wall of the electrolytic cell, a negative electrode plate arranged at the bottom end of the inner wall of the electrolytic cell, and a cleaning assembly. The bottom surface of the positive electrode plate is matched with the upper part of the outer side surface of the screw rod. The device further comprises a solid discharge part arranged at the lower side of one end of the electrolytic cell.

2. The laterite nickel ore leachate electrochemical reaction device according to claim 1, characterized in that, The solid discharge part is connected with a slag discharge pipe at the bottom end.

3. The laterite nickel ore leachate electrochemical reaction device according to claim 2, characterized in that, The solid discharge part is provided with a guide inclined platform.

4. The laterite nickel ore leachate electrochemical reaction device according to claim 1, characterized in that, The screw rod comprises a rotating shaft and a helical blade. The device further comprises a heater arranged in the shaft groove in the rotating shaft.

5. The laterite nickel ore leachate electrochemical reaction device according to claim 4, characterized in that, The driving part comprises a motor. The other end of the electrolytic cell is provided with a fixing base.

6. The laterite nickel ore leachate electrochemical reaction device according to claim 1, characterized in that, The other end of the rotating shaft is connected with the fixing base through a bearing.

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

8. The laterite nickel ore leachate electrochemical reaction device according to claim 7, characterized in that, The positive electrode plate and the negative electrode plate are both in an arc-shaped plate structure and are symmetrically arranged at the upper and lower ends of the inner wall of the electrolytic cell.

9. The laterite nickel ore leachate electrochemical reaction device according to claim 1, characterized in that, The device further comprises two arc-shaped connecting frames.

10. The laterite nickel ore leachate electrochemical reaction device according to claim 1, characterized in that, The device further comprises an additive pipe and a pressurizing pipe.

Images