An integrated production system for ternary materials

Abstract

The present invention relates to the technical field of ternary material manufacturing, and specifically to an integrated production system for ternary materials. The present invention includes a stirring and mixing device for stirring and mixing materials, a water washing kettle for uniform pulping and providing a reaction space, a stirring tank filter for realizing stirring and filtering operations of materials, and a dryer for drying materials, which are sequentially arranged along the travel path of the ternary material. The present invention can effectively guarantee its own production capacity and production efficiency while adapting to the process requirements of large-scale production of ternary materials, high requirements for water content and washing effect, high requirements for particle crystal form, high requirements for purity, and high requirements for closed operation, and simultaneously meet the green manufacturing characteristics of efficiency increase, energy saving, consumption reduction, and emission reduction required by current green manufacturing.

Description

Technical Field

[0001] The invention relates to the technical field of ternary material manufacturing, and in particular to an integrated production system for ternary materials. Background Art

[0002] Lithium-ion batteries have been commercialized in 1991 due to their advantages such as high energy density, high output voltage, high power, low self-discharge, no memory effect, wide operating temperature range, and green environmental protection. At present, lithium-ion batteries have become the preferred power source for laptops, mobile phones, digital cameras, flashlights, and other electronic products; ternary materials are one of the main components of the positive electrode of lithium-ion batteries. The traditional synthesis of ternary materials currently mainly includes high-temperature solid-phase method, low-heat solid-phase method, sol-gel method, co-precipitation method, etc.; but the material obtained by the solid-phase method is uneven in phase and particle size, and high temperature will also cause lithium volatilization; the co-precipitation method has a low cost and the product is relatively uniformly mixed, but the process of preparing precursors by the co-precipitation method is complicated, and the precipitation rates of different cations are different; in the sol-gel method, the material is obtained in the liquid phase, and the ions can be fully mixed to obtain a pure phase material, but there are many factors that affect the gel, and the morphology and particle size of the product are not easy to control. Therefore, people gradually began to use the co-precipitation method to synthesize the ternary precursor, and then use the high-temperature solid-phase method to synthesize the final product, which is the co-precipitation-high-temperature solid-phase method with more mature technology and wider industrial application.

[0003] When the coprecipitation-high temperature solid phase method is used to produce ternary materials, the production process mainly consists of stirring and mixing, precipitation reaction, solid-liquid separation, washing and impurity removal, drying and other sections. The corresponding equipment is the stirring and mixing equipment, reactor, automatic centrifuge, filter, dryer, etc. arranged in sequence along the production process. There are problems such as long process route and many equipment. The whole process has high energy consumption, limited efficiency, and large consumption of washing liquid. It also increases the risk of difficult control of the quality of ternary materials and high cost. It obviously does not have the characteristics of efficiency increase, energy saving, consumption reduction, and emission reduction required by current green manufacturing. Especially for the filtering and washing stage, most ternary material manufacturers habitually use automatic centrifuges to implement this process. Automatic centrifuge is a filtering, automatic bottom unloading, intermittent centrifuge. Its mechanism is to form a centrifugal field with a separation factor of 700 to 1000 through the high-speed rotation of the rotor system. The ternary material is accelerated in the centrifugal field, the solid-liquid separation speed is fast, and the moisture content of the obtained filter cake is low, which can improve the drying efficiency of the subsequent drying stage to a certain extent. However, the problems with the automatic centrifuge in implementing the ternary material filtering and washing process are: first, the technical parameters of the automatic centrifuge are limited; the automatic centrifuges with the widest industrial application currently have rotor diameters of 1250mm and 1500mm, and the theoretical maximum processing capacity is about 500kg per batch, which is a small processing volume. Secondly, the washing method is backward and the washing effect is poor; the washing method of the automatic centrifuge is a displacement washing method. When the thickness of the filter cake on the circumferential drum surface is thick, the washing liquid needs to be rinsed from the inside to the outside, the washing time is long, the amount of washing liquid consumed is large, and the material washing is uneven. Thirdly, the power consumption of a single machine is large; the automatic centrifuge with a rotor diameter of 1250mm is equipped with a power of 22kW, and there is an alternation of speed increase and speed decrease during the operation process, which consumes a lot of power. Finally, the production characteristics of ternary materials themselves lead to a lot of residual materials; and ternary materials are produced intermittently in batches. After the previous batch is completed, the whole machine needs to be cleaned immediately to avoid the residual materials of the previous batch of materials in the drum affecting the quality of the finished products of the next batch of materials. The traditional cleaning operation requires personnel to open the cover, clean manually, or even drill into a semi-enclosed automatic centrifuge for cleaning, which is time-consuming and labor-intensive and has poor safety. At the same time, the cleaning effect is obviously unsatisfactory. So, whether it is possible to develop a new integrated production system that can replace the traditional automatic centrifuge, so as to adapt to the large production scale of ternary materials, high requirements for water content and washing effect, high requirements for particle crystal form, high requirements for purity, and high requirements for closed operation, while effectively guaranteeing its own production capacity and production efficiency, and simultaneously meeting the green manufacturing characteristics of efficiency increase, energy saving, consumption reduction, and emission reduction required by the current green manufacturing, is a technical problem that needs to be solved in recent years in this field. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide an integrated production system for ternary materials with a reasonable structure and high cost performance, which can adapt to the process requirements of large-scale production of ternary materials, high requirements on water content and washing effect, high requirements on particle crystal form, high requirements on purity, and high requirements on closed operation, while effectively ensuring its own production capacity and production efficiency, and simultaneously meeting the green manufacturing characteristics of efficiency increase, energy saving, consumption reduction, and emission reduction required by current green manufacturing.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An integrated production system for ternary materials, characterized by comprising a stirring and mixing device for stirring and mixing materials, a water washing kettle for uniform pulping and providing a reaction space, a stirring tank filter for realizing stirring and filtering operations of the materials, and a dryer for drying the materials, which are arranged in sequence along the travel path of the ternary materials, wherein:

[0007] The stirring tank filter comprises a tank body formed by an upper shell and a lower base axially matched with each other, the cavity formed by the upper shell and the lower base constitutes a washing chamber for washing materials, and a filtering surface with a water filtering function is arranged at the lower base, and the filtering surface divides the washing chamber into a stirring chamber and a water filtering chamber located below the stirring chamber; the stirring tank filter also comprises a spraying assembly for injecting a washing medium and a stirring assembly for performing a stirring operation on the material in the stirring chamber; a feed pipe and a solid discharge pipe connected to the stirring chamber are arranged at the upper shell, and a water outlet pipe connected to the water filtering chamber is arranged at the lower base; the upper shell and the lower base are locked to each other by a locking assembly, so that the tank body has two working states: combination and disassembly: when the tank body is in the combined state, the upper shell and the lower base are locked to each other by the locking assembly to form the tank body; when the tank body is in the disassembled state, the locking assembly is opened, the lower base moves downward and detaches from the upper shell, thereby exposing the filtering surface located at the lower base and the residual filter cake located on the filtering surface.

[0008] Preferably, the locking assembly includes a locking ring that is coaxially rotatably engaged with the bottom edge of the upper shell body, the lower ring surface of the locking ring extends vertically downward along the axial direction of the upper shell body, and the lower ring surface of the locking ring is provided with a bite tooth protruding radially inward; the outer wall of the lower base is in the shape of a two-section stepped shaft that is thin at the top and thick at the bottom, and the outer wall of the large diameter section of the lower base is provided with a mating tooth protruding radially, and each mating tooth is evenly distributed in sequence along the circumference of the lower base; in the circumferential direction of the locking ring, the distance between each adjacent bite tooth is greater than the width of the mating tooth, so that the mating tooth can pass through the gap between each bite tooth from bottom to top; when the tank body is in an assembled state, the bottom surface stop of the meshing tooth is engaged with the top surface of the mating tooth, so that the shaft shoulder of the lower base is sealed and pressed against the bottom edge of the upper shell body from bottom to top.

[0009] Preferably, the stirred tank filter also includes a support assembly for lifting the upper shell off the base surface; the support assembly includes support legs evenly distributed around the circumference of the upper shell, and support ears evenly distributed around the outer wall of the upper shell corresponding to the number of support legs, and the top end of the bottom end of each support leg is fixedly fitted with the corresponding support ear; the piston cylinder end of the hydraulic cylinder is hinged at the support ear, and the piston rod end of the hydraulic cylinder extends vertically downward and forms an articulated fitting relationship with the connecting ear plate fixed at the lower base; there are more than two groups of hydraulic cylinders and they are evenly distributed in sequence around the circumference of the lower base.

[0010] Preferably, the locking ring generates a rotational thrust through a power cylinder arranged at the upper shell; a stop section extends vertically upward at the engaging teeth, and a mating groove is recessed at the corresponding mating position of the upper shell; when the tank body is in an assembled state, the stop section is inserted into the mating groove.

[0011] Preferably, the inner ring surface of the locking ring is in the shape of a two-stage stepped hole that is thin at the top and thick at the bottom, and an outer flange is arranged on the bottom edge of the upper shell body, and a surface-fitting rotating fitting relationship is formed between the upper surface of the outer flange and the hole shoulder of the locking ring; the outer shape of the engaging tooth is wedge-shaped, and the tip of the engaging tooth points to the locking rotation direction of the lower base.

[0012] Preferably, moving wheels are arranged at the lower base; tracks are laid on the base surface for the moving wheels to cooperate with when falling; and anti-deflection guard plates are arranged on the outer side of the tracks to prevent the moving wheels from running off course.

[0013] Preferably, the stirring assembly includes a stirring shaft arranged coaxially with the upper shell body, the top end of the stirring shaft passes through the top surface of the upper shell body and forms a power match with the power motor located above the upper shell body, and a stirring blade is arranged at the bottom end of the stirring shaft; the stirring blade includes a front inclined plate, a rear inclined plate and a bottom plate extending radially outward from the stirring shaft, and the plate surface slopes of the front inclined plate and the rear inclined plate decrease sequentially from the inside to the outside; the inner ends of the front inclined plate, the rear inclined plate and the bottom plate are fixed to the shaft body of the stirring shaft, and the outer ends of the front inclined plate, the rear inclined plate and the bottom plate are closed by the end plate, thereby forming a hollow triangular pyramid structure of the stirring blade; there is an angle between the bottom plate surface and the horizontal plane, and the stirring blades are symmetrically arranged along the circumferential axis of the stirring shaft.

[0014] Preferably, a plow blade for cutting into and turning over the material is arranged on the front inclined plate of the stirring blade facing the stirring direction, and the plow blade has an appearance of an arc-shaped tile extending smoothly downward and forward from the surface of the front inclined plate. The plow blades are evenly spaced on the front inclined plate along the radial direction of the stirring blade, and the travel paths of the plow blades on each stirring blade are staggered from each other; an intermediate blade is also arranged on the bottom surface of the stirring shaft, and the intermediate blade cooperates with the travel paths of the plow blades on each stirring blade to form a whole circle.

[0015] Preferably, a transverse partition is arranged in the cavity of the stirring blade, and a matching gap exists between the front end of the transverse partition and the end plate, thereby dividing the cavity of the stirring blade into an upper heating chamber and a lower heating chamber which are connected to each other only by the matching gap; a heating inlet and a heating outlet are arranged in the stirring shaft, and the heating inlet and the heating outlet are respectively connected to the corresponding upper heating chamber and lower heating chamber.

[0016] Preferably, the integrated production system also includes a three-way material transport pipe, the inlet pipe of the three-way material transport pipe is connected to the outlet of the solid discharge pipe, the dryer is a twin-screw dryer, and the two groups of outlet pipes of the three-way material transport pipe are respectively connected to the inlet of one group of twin-screw dryers; a material switching valve for selecting one group of outlet pipes to discharge materials is arranged at the three-way joint of the three-way material transport pipe.

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

[0018] 1) Based on the existing ternary material production system, the traditional centrifuge-type filtration structure with small processing capacity and low efficiency is abandoned, and the stirring tank filtration layout is adopted instead, thereby utilizing the large-capacity, one-time material processing characteristics of the stirring tank to adapt to the process requirements of high production scale, low water content and high washing effect of ternary materials. Specifically, in actual use, the ternary material first enters the stirring chamber through the feed pipe, and the spraying components such as the nozzle spray the washing medium synchronously, and the stirring components such as the stirring paddle and even the stirring plate implement the stirring operation. While the ternary material is being washed and stirred, the washing waste liquid generated leaks down the filter surface to the water filter chamber and is converged by the outlet pipe. The completely washed ternary material is then discharged from the chamber through the solid discharge pipe, and this is repeated. In the above operation, each time a batch of ternary materials is washed, the chamber washing operation needs to be performed. At this time, due to the detachable nature of the tank body, the locking assembly can be opened and the lower base or upper shell can be removed to expose the filter surface on the lower base. Then, the residual filter cake on the filter surface and even on the inner wall of the tank can be quickly and efficiently removed, which is extremely convenient to use.

[0019] Obviously, it can be seen from the above that the present invention can adapt to the process requirements of large-scale production of ternary materials, high requirements for water content and washing effect, high requirements for particle crystal form, high requirements for purity, and high requirements for closed operation, while effectively ensuring its own production capacity and production efficiency, and simultaneously meeting the green manufacturing characteristics of efficiency increase, energy saving, consumption reduction, and emission reduction required by current green manufacturing; after adopting the above system of the present invention, its single-line production capacity has increased by 6 to 10 times, from the original 400kg per batch to 2000 to 4000kg, and the production efficiency has been greatly improved; at the same time, 10,000 tons of production capacity reduces production wastewater by 200,000 tons; and the actual power consumption of the core equipment stirring tank filter is only 1 / 2 of the rated configuration power, which greatly reduces power consumption. According to calculations, the energy consumption of centrifugal equipment per 100kg in traditional processes is about 5.5kW·h, and the energy consumption of the stirring tank filter of the present invention is about 0.8 to 1kW·h per 100kg. Calculated based on an annual production capacity of 10,000 tons, it can save more than 4.5×105kW·h of energy consumption, with significant results.

[0020] 2) For the locking assembly, there are a variety of locking methods: such as threaded engagement, or locking by inserting a locating pin or a locating column, or even directly using the external force of the hydraulic cylinder group to ensure the sealing function of the lower base relative to the upper shell, etc. As a further preferred embodiment of the present invention, the present invention adopts the rotation function of the locking ring, and utilizes the engagement of the engaging teeth at the locking ring with the mating teeth at the lower base, thereby ensuring the sealing purpose of the lower base relative to the upper shell. Compared with the uncertainty of the locking by inserting a locating pin or a locating column, the cumbersome operation of the threaded engagement method, and the working instability of the pure hydraulic cylinder group force, the locking ring locking structure of the present invention can ensure the stability and certainty of the tank body in the assembled state, and simultaneously ensure the convenience of operation, achieving multiple goals at one stroke.

[0021] 3) In actual operation, the present invention should be kept away from the base surface such as the ground, so as to leave room for the lower base to move. The lower base can be driven by a number of hydraulic cylinders evenly distributed around the circumference to produce a mechanized and controllable lifting action, so that when the lower base is separated from the upper shell, the stability, reliability and safety of the entire separation operation can always be guaranteed.

[0022] 4) Since the present invention is calibrated for large-capacity washing, filtering and drying functions, the mass of the entire tank body is extremely heavy, and the lower base is no exception. This is one of the fundamental reasons why the lower base needs to rely on a hydraulic cylinder to drive the movement. At the same time, the locking ring also needs to be driven by a power cylinder to ensure the rotation of the locking ring. However, due to the integrated matching structure formed by the power cylinder between the locking ring and the upper shell, once the locking ring is actuated, it may drive the lower base to produce a follow-up deflection movement under high friction, which needs to be eliminated. Therefore, the present invention uses the design of the stop section and the matching groove, so that once the lower base is axially inserted into the locking ring, the stop section at the lower base is naturally inserted into the matching groove at the upper shell to form a stop fit, thereby avoiding unexpected follow-up rotation of the lower base.

[0023] 5) Due to its large structure, the locking ring can be clamped on the outer flange of the upper shell by its own gravity in actual operation. If necessary, oil lubrication or grease lubrication can be used to improve the lubrication effect between the upper surface of the outer flange and the shoulder of the locking ring. The special wedge shape of the bite teeth is to facilitate the lower base to be clamped into the bite teeth of the locking ring more quickly, which will not be described here.

[0024] 6) The design of the moving wheel and track allows the base surface to quickly receive the lower base during cleaning, and the lower base can move sideways along the track to free up more cleaning space. The anti-deflection guard plate is used to guide the moving wheel's path.

[0025] 7) As another highlight of the present invention, the stirring assembly of the present invention has a heating-type turning and pushing blade structure on the basis of the conventional stirring structure of a stirring blade and a stirring shaft. Specifically, the stirring blade alone presents a happy triangular pyramid structure. On the one hand, the unique inclined surface of the stirring blade is utilized to ensure the turning washing of the ternary material and the pushing function from the inside to the outside, so as to enhance the washing effect of the ternary material and ensure the slow movement function of the ternary material to the solid discharge pipe. On the other hand, a transverse partition is arranged in the cavity of the stirring blade, thereby changing the traditional stirring blade into a heating-type blade, thereby realizing the preheating function of the washed and filtered material on the basis of the above-mentioned washing and filtering functions of the present invention. The preheated material then enters the next drying process through the solid discharge pipe, and its drying efficiency can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the working state of the present invention;

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the stirring tank filter when the tank body is in the assembled state;

[0028] Figure 3This is a diagram showing the matching state of the lower base and the base surface when the tank body is in a disassembled state;

[0029] Figure 4 A diagram showing the matching state of the stop section and the matching groove;

[0030] Figure 5 for Figure 2 A partial enlarged view of part I;

[0031] Figure 6 for Figure 2 A partial enlarged view of part II;

[0032] Figure 7 is a schematic diagram of the structure of the stirring blade;

[0033] Figure 8 for Figure 7 Left view of

[0034] Fig. 9 This is a schematic diagram of the working status of the material switching valve.

[0035] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0036] 10-Stirring and mixing equipment 20-Water washing kettle 30-Stirring tank filter

[0037] 31-upper shell 31a-outer flange 32-lower base

[0038] 32a- Filtering surface 32b- Connecting ear plate 32c- Moving wheel 32d- Hydraulic cylinder

[0039] 33-Spraying assembly 34-Stirring assembly

[0040] 34a - stirring shaft 34b - front inclined plate 34c - rear inclined plate 34d - bottom plate 34e - end plate

[0041] 34f- plow blade 34g- middle blade 34h- partition

[0042] 34i-heating inlet 34j-heating outlet

[0043] 35-solid discharge pipe 36-water outlet pipe 37-locking assembly

[0044] 37a-locking ring 37b-engaging teeth 37c-matching teeth

[0045] 37d- stop section 37e- matching groove

[0046] 38a-Support leg 38b-Support ear seat

[0047] 39-track 39a-anti-deflection guard plate

[0048] 40-Three-way material transport pipe 50-Twin screw dryer 60-Material switching valve DETAILED DESCRIPTION

[0049] For ease of understanding, the specific structure and working mode of the present invention are further described below in combination with the overall production system and process of the ternary material:

[0050] The production system based on ternary materials provided by the present invention is based on a stirring tank filter 30. By organically integrating the functions of closed pressure filtration, stirring slurry washing, automatic rotary unloading, and self-heating into the stirring tank filter 30, the overall structure is compact and optimized, thereby effectively shortening the process flow. Based on the structure of the stirring tank filter 30, by equipping its front-end process with a highly efficient water washing kettle 20, the materials can be fully dispersed and reacted; and by equipping its rear end with a twin-screw dryer 50, the materials can be fully mixed and dried efficiently without destroying the crystal form of the materials, and finally high-quality ternary materials are obtained, and the entire process has green manufacturing characteristics.

[0051] More specifically, the present invention relates to a production system based on ternary materials, such as Figure 1-9 As shown, it is mainly composed of a stirring and mixing device 10, a water washing kettle 20, a stirring tank filter 30, a material switching valve 60, a twin-screw dryer 50, etc. Among them:

[0052] Mixing equipment

[0053] The stirring and mixing equipment 10 is mainly used to mix the mixed solution of Ni, Co, Mn plasma, pure water, alkali solution, etc. The mixing speed, stirring paddle structure, baffle, etc. are key factors affecting the mixing effect. The water washing kettle 20 is a device for uniform slurrying and reaction of the mixed materials, and is also the core equipment for obtaining the precursor.

[0054] The stirring and mixing device 10 generally includes a stirring tank, and the structural features of the stirring tank, such as the size of the kettle, the type of the stirrer, the rotation speed, the number, type and size of the baffles, and the feeding position, are all key factors affecting the reaction; similarly, the diameter, number and type of the stirring paddles also need to be set according to the technical parameters such as the volume and diameter of the stirring and mixing device 10. The baffles evenly arranged on the wall of the stirring and mixing device 10 help to improve the mixing effect.

[0055] Water washing kettle

[0056] Before the material is filtered, pulped, washed and pre-dried in the stirring tank filter 30, a water washing kettle 20 for uniform pulping and reaction is required. Figure 1As shown, an anchor agitator is provided at the center of the water washing kettle 20, in which an anchor propeller is provided, and the rotation speed is relatively low, generally lower than 100r / min; the highest position of the anchor propeller must be below the liquid surface. In order to prevent the anchor propeller from rubbing against the wall of the water washing kettle 20, there is generally a certain safety distance of 10 to 20mm. The anchor propeller is also provided with a number of scrapers, which are generally made of plastic such as polytetrafluoroethylene. The distance between the scraper and the wall of the water washing kettle 20 is relatively small, which can be less than 5mm, to prevent the material from gathering on the wall. In addition, a high-speed disperser is also arranged on the side of the non-central position of the wall of the water washing kettle 20, that is, the position to avoid the anchor agitator. The main shaft of the high-speed disperser is provided with a serrated dispersion disk, which is generally small in diameter, about 200 to 600mm, and can be set according to the technical parameters such as the volume, diameter, and rotation speed of the reactor. The high-speed disperser has a relatively high rotation speed, generally 1000 to 2000r / min. Under the dual action of the anchor agitator and the high-speed disperser, the materials can be fully mixed to achieve the purpose of efficient pulping and reaction.

[0057] Stirred tank filter

[0058] The stirred tank filter 30 is the innovation of the present invention and is also the core equipment of the system. Its functions integrate multiple functions such as solid-liquid filtration, pulping, washing, impurity removal, and pre-drying, which greatly shortens the process flow and realizes solid-liquid separation efficiently.

[0059] The specific structure of the stirring tank filter 30 is shown in FIG. Figure 2-8 Considering automation and intelligence, as well as the convenience of cleaning the residual filter cake, the entire stirred tank filter 30 is designed as a split structure, including a tank body formed by an upper shell 31 and a lower base 32. In order to prevent metal elements such as iron, zinc, and copper from entering the ternary material and affecting the product quality, the tank body and even the part of the structure described later that contacts the ternary material need to be sprayed with tungsten carbide or other wear-resistant materials.

[0060] The outer wall of the lower base 32 is in the shape of a two-stage stepped shaft with a thin upper portion and a thick lower portion, so as to utilize the coaxial plug-in fit of the small right-angle section of the lower base 32 relative to the bottom edge of the upper shell 31 to achieve the fit and sealing of the two; if necessary, the following may be added: Figure 6 When the lower base 32 is inserted into the upper shell 31 from bottom to top, the locking function of the locking assembly 37 is required to ensure the firmness of the fit between the lower base 32 and the upper shell 31 and the external sealing effect. Figure 2-3 As shown, a filter surface 32a formed of a metal filter mesh or filter cloth or other filter material is laid on the top surface of the lower base 32. Once the tank body is assembled and formed, the filter surface 32a naturally forms a double-layer cavity structure with the upper part of the tank body being a stirring cavity and the lower part being a water filtering cavity. Figure 2It can be seen that in order to ensure the internal stirring effect of the tank body, a stirring assembly 34 is coaxially arranged at the upper shell 31; in addition, a feed pipe and a spray assembly 33 are arranged above the upper shell 31, and a water outlet pipe 36 is arranged at the bottom of the lower base 32 to ensure the feeding of ternary materials and washing media and the discharge of washing waste liquid. The solid discharge pipe 35 is arranged on the side of the upper shell 31 to facilitate discharge. The size of the solid discharge pipe 35 is determined according to process parameters such as the cylinder volume and the slag content. The solid discharge pipe 35 is connected to an automatic discharge valve, such as a hydraulic automatic opening and closing plunger discharge valve or an electric screw-driven opening and closing plunger discharge valve, so as to achieve the purpose of automatic discharge on demand; if necessary, by setting sensors and program interlocking, it can also be intelligent.

[0061] In actual operation, Figure 2-5 As shown, the locking assembly 37 includes a locking ring 37a. The annular cavity of the locking ring 37a is in the shape of a two-stage stepped hole that is thin at the top and thick at the bottom. An outer flange 31a is arranged at the bottom edge of the lower shell. During assembly, the locking ring 37a is coaxially sleeved on the outer wall of the lower shell, and the hole shoulder of the locking ring 37a and the top surface of the outer flange 31a are used to rotate in a surface-fitting manner to achieve the rotation purpose of the locking ring 37a. Considering the huge mass of the locking ring 37a, if necessary, the two ends of the power cylinder can be hinged to the outer wall of the upper shell 31 and the locking ring 37a respectively, so as to use the hydraulic pressure of the power cylinder to ensure the function of applying circumferential force to the locking ring 37a. A number of engaging teeth 37b are evenly distributed around the inner wall of the large-diameter section of the locking ring 37a, and for the lower base 32, as shown in FIG. Figure 3-4 As shown, a plurality of matching teeth 37c are evenly distributed axially on the outer wall of the large diameter section of the lower base 32.

[0062] When the tank assembly operation is required, the lower base 32 is first lifted and coaxially inserted into the upper shell 31. Afterwards, driven by the hydraulic pressure of the power cylinder, the locking ring 37a rotates, driving the engaging teeth 37b to rotate, thereby locking or loosening with the matching teeth 37c. Figure 2 In the figure, one implementation method is that when the locking ring 37a rotates clockwise, the mating teeth 37c and the bite teeth 37b are meshed and locked with each other; conversely, the mating teeth 37c and the bite teeth 37b are loosened and disengaged from each other. In order to prevent the lower base 32 from spinning under the meshing friction of the bite teeth 37b during the meshing process, causing meshing failure, two or more mating teeth 37c evenly distributed on the outer circumference of the lower base 32 can be selected as anti-rotation teeth. In other words, the anti-rotation teeth should extend vertically upward to form a shape as shown in FIG. Figure 4The stop section 37d shown in the figure has a matching groove 37e milled out on the upper shell 31 to match the stop section 37d, forming an anti-rotation matching structure similar to a keyway and a key. Because the upper shell 31 is fixed, the circumferential freedom of the lower base 32 is eliminated under the cooperation of the stop section 37d and the matching groove 37e at the anti-rotation tooth, and the lower base 32 will not rotate during the meshing process.

[0063] Through the above-mentioned large-diameter cylinder hydraulic gear-engaging cylinder flange automatic opening and closing technology, the present invention can realize the automatic opening and closing operation of the full series of hydraulic gear-engaging cylinder flanges between 2000mm and 3200mm in diameter, with remarkable results.

[0064] Furthermore, during the meshing rotation, the shoulder of the locking ring 37a and the corresponding surface at the outer flange 31a of the upper shell 31 are force-bearing surfaces that interact with each other. When the engaging teeth 37b and the matching teeth 37c are meshed and locked with each other, the pressure generated will be transmitted to the upper shell 31 through the locking ring 37a, and finally transmitted to the base surface through the support ear seat 38b and the support leg 38a. In order to ensure that the locking ring 37a rotates smoothly during the locking process, an oil groove is arranged at the shoulder of the locking ring 37a. When in use, an appropriate amount of grease can be added to the oil groove through the oil filling hole to play a lubricating role; of course, an appropriate amount of lubricating materials such as graphite can also be embedded in the shoulder of the locking ring 37a, which can also play a lubricating role.

[0065] Furthermore, in order to realize automation and intelligence, Figure 2 As shown, a weight sensor can be set between the support ear seat 38b and the support leg 38a of the upper shell 31. Through the weight sensor and program calculation, detergent and the like are automatically added in proportion according to the weight of the material, thereby realizing intelligence. The support ear seats 38b are generally set to two or three and are evenly distributed. At the same time, Figure 2 As shown, the lower base 32 and the supporting ear seat 38b are connected to each other through a hydraulic cylinder 32d; the piston cylinder end of the hydraulic cylinder 32d is hinged to the bottom surface of the supporting ear seat 38b, and the piston rod end of the hydraulic cylinder 32d is hinged to the connecting ear plate 32b, and the connecting ear plate 32b is fixed to the lower base 32, so that the lower base 32 has a vertical mechanical lifting function through the telescopic function of the hydraulic cylinder 32d.

[0066] In addition, moving wheels 32c are provided at the bottom of the lower base 32. Four moving wheels 32c are preferably provided. Generally, the front two wheels are universal wheels for guiding, and the rear two wheels are fixed wheels. In order to prevent the lower base 32 from colliding with or damaging the equipment due to the difficulty in controlling the guiding during movement, and to prevent the lower base 32 from being too heavy and causing damage to the base surface, a track 39 is generally provided at the base surface. When the locking assembly 37 is released and the lower base 32 rises and falls under the drive of the hydraulic cylinder 32d, the moving wheel 32c directly enters the track 39, which is convenient for movement and has a fixed direction. To prevent deviation, the outer side of the track 39 can be as shown in the figure. Figure 3 The anti-deflection guard plate 39a is shown, and the height of the anti-deflection guard plate 39a is slightly shorter than the diameter of the moving wheel 32c. The track 39 is generally a steel plate, which plays a role in reducing friction, facilitating the movement of the lower base 32, and also protecting the epoxy floor paint surface of the factory area.

[0067] Furthermore, in order to reduce the power consumption of the stirring tank filter 30 and achieve green energy saving, the present invention also improves the structure of the stirring assembly 34. On the basis of retaining the structure of the stirring blade, stirring shaft 34a and power motor of the traditional stirring assembly 34, the present invention designs the stirring blade to be a hollow triangular pyramid structure to achieve the multiple purposes of light weight, self-heating, self-turning and self-pushing.

[0068] Specifically, if Figure 2 and Figure 7-8 As shown, in actual design, the stirring blades can be designed into two groups and arranged symmetrically along the stirring shaft 34a. The two groups of stirring blades are of the same size, balanced on both sides, and more balanced in working force. Taking the stirring blade on one side as an example, it is surrounded by a hollow cavity structure with a triangular cross section by a front inclined plate 34b, a rear inclined plate 34c, a bottom plate 34d and an end plate 34e. The cross section of the triangular hollow cavity of the stirring blade decreases from the center to the outside at a certain slope, and its large end, that is, the inner end, is welded and fixedly connected with the mounting seat at the stirring shaft 34a, and the small end, that is, the outer end, extends to the cylinder wall of the upper shell 31, and finally forms a triangular truncated pyramid structure similar to a truncated cone. In the cross section of the stirring blade, since the front inclined plate 34b and the rear inclined plate 34c are consistent and symmetrical in shape, the cross section presents an isosceles or even equilateral triangle; at the same time, the angle α between the bottom plate 34d and the horizontal plane is generally 7 to 12°, which can avoid friction between the entire plane of the bottom plate 34d and the material. During actual scraping, only the blade of the plow blade cuts into the filter cake, which is a linear contact and causes less damage to the filter cake crystals. The plow blades 34f are multiple and arranged at intervals, which also reduces the squeezing force on the filter cake and is beneficial to maintaining the crystal form, thereby avoiding the unfavorable situation of destroying the crystal shape and consuming power. Because the cross-section of the triangular hollow cavity of the stirring blade decreases at a certain slope from the center to the outside, this causes the entire blade to generate an outward thrust when it rotates, pushing the material from the center to the outside until it is slowly discharged from the solid discharge pipe 35. Plow blades 34f are also intermittently welded on the front inclined plate 34b of each stirring blade. From Figure 6As can be seen in the figure, the trajectories of the circles drawn by the plow blades 34f are interlaced with each other, that is, they do not interfere with each other. The bottom surface of the mounting seat of the stirring shaft 34a is also provided with an intermediate blade 34g, which is used to scrape the material directly below the stirring shaft 34a that the plow blades 34f cannot scrape. In the top view direction, the trajectories of the circles drawn by the plow blades 34f, combined with the rotation trajectory of the intermediate blade 34g, should cooperate with each other to form a full circle so as to cover the entire filtering surface 32a of the stirring tank filter 30. The arc-shaped tile-shaped plow blade design of the plow blade 34f is also more convenient for cutting into and turning over materials.

[0069] On the basis of the above-mentioned lightweight, self-turning and self-pushing structure of the stirring blade, the stirring blade also has a self-heating function. Specifically, taking the stirring blade on one side as an example, the triangular hollow cavity of the stirring blade is also welded with a transverse partition 34h, which not only strengthens the strength of the hollow cavity so that the stirring blade can withstand the filtering pressure, but also divides the triangular hollow cavity into an upper heating cavity and a lower heating cavity. Figure 6 It can be seen that a matching gap is left between the stirring blade and the end plate 34e, so that the upper heating chamber and the lower heating chamber are connected to each other. The upper heating chamber is connected to the heating inlet 34i at the stirring shaft 34a, and the lower heating chamber is connected to the heating outlet 34j at the stirring shaft 34a. In the pre-drying stage of the ternary material, a heat source such as steam can be introduced from the center of the stirring shaft 34a, enters from the heating inlet 34i, passes through the upper heating chamber and the matching gap to reach the lower heating chamber, and finally is discharged from the heating outlet 34j to form a heat exchange passage. The stirring blade on the other side is also arranged in the same way. In this way, the stirring blade can carry the heat source to directly pre-dry the ternary material, and during the drying process, the stirring blade can also rotate and turn the material over, so that the heat transfer efficiency is higher and the heating process of the ternary material is more uniform.

[0070] Twin screw dryer

[0071] The twin screw dryer 50 is a low shear, high-efficiency drying equipment. The twin screw dryer 50 can revolve and rotate at a low speed, and has a good mixing effect, but the stirring intensity is low and the shear force is weak, which can ensure the integrity of the material crystal form and the product quality. Because the material drying cycle is long, in order to ensure the matching of the process, a material switching valve 60 is generally set between the stirring tank filter 30 and the twin screw dryer 50. Through the automatic switching of the material switching valve 60, one stirring tank filter 30 is matched with two twin screw dryers 50, so that the process time is coordinated with each other.

[0072] like Fig. 9As shown, in actual design, the material switching valve 60 is provided with a joint of the three-way material transport pipe 40, and the valve plate is controlled by the cylinder to swing, so as to realize the rapid switching function of the two groups of outlet pipes of the material at the three-way material transport pipe 40. The swing position of the valve plate is sensed by the sensor, and according to the signal, it can be known which outlet pipe and twin-screw dryer 50 the current material enters. In order to prevent the accumulation of materials in the upper space of the valve plate, a nozzle can be set on the circumference of the upper space of the valve plate, and compressed air is blown away regularly to prevent aggregation. If the outlet pipe is long, an air hammer can be set on its outside to vibrate the outlet pipe regularly to prevent aggregation. Similarly, in order to prevent metal elements such as iron, zinc and copper from entering the ternary material and affecting the product quality, the part of the three-way material transport pipe 40 that contacts the material needs to be sprayed with tungsten carbide or other wear-resistant materials.

[0073] After the material is filtered, pulped, washed, and pre-dried in the stirring tank filter 30, it is output by the automatic discharge valve and falls into the corresponding twin screw dryer 50 through the three-way material transport pipe 40. The twin screw dryer 50 can be fed with a heat source, and the material and the heat source are fully mixed and dried under the dual effects of the revolution and rotation of the twin screws. In order to improve the drying efficiency, a vacuum port is provided at the upper part of the head of the twin screw dryer 50, and the drying process can be accelerated by vacuuming. In order to prevent the material from being sucked away, a dust collector can be set at the twin screw dryer 50, and a filter element is provided inside. The number, material, and precision of the filter element are determined according to actual needs. A vacuum port is provided at the upper part of the dust collector. When vacuuming, if material dust is sucked, it will be trapped on the outer filter surface of the filter element by the filter element. After the vacuuming is completed, backblowing can be performed through the backblowing port provided, and the material dust trapped on the outer filter surface of the filter element can be blown into the twin screw dryer 50. The filter element can also be arranged so that when vacuuming, the material dust is trapped on the filter surface inside the filter element, which can be determined according to the structure type of the filter element.

[0074] In specific operation, in order to ensure smooth transportation of the solid discharge of the stirring tank filter 30, the stirring tank filter 30 is generally set upstairs or on a platform to have a certain height; and the twin-screw dryer 50 is set at a corresponding low position, and the two are connected through the three-way material transport pipe 40 and the material switching valve 60. In this way, the solid discharge of the stirring tank filter 30 can fall freely by gravity, and the transportation method is relatively reliable.

[0075] In order to further understand the green manufacturing system to which the present invention belongs, the specific use of the present invention is further described below in combination with the following production process:

[0076] 1) The ternary material raw materials of NiSO4, MnSO4 and CoSO4 are fully stirred and mixed with pure water in a stirring and mixing device 10 according to a set ratio, such as 5:2:3, to form a ternary material salt solution; at this time, the solution concentration is controlled at about 20-40%, and the solution density is controlled at 1.1-1.4.

[0077] 2) The ternary material salt solution is pumped into the water washing kettle 20 by the stirring and mixing device 10, and dilute alkali solution, complexing agent, coating agent and pure water are added at the same time to carry out complexing reaction and aging. At this time, the pH value is controlled at 11±2, the reaction temperature is 60℃ and maintained, the reaction time is ≤1h, and the particle diameter is controlled at 5μm. In order to ensure the above process requirements, the main shaft stirring speed of the water washing kettle 20 is 0~40rpm, usually 30rpm; the side paddle speed is 0~600; usually 400rpm; the dispersion disk is sprayed with 0.3mm tungsten carbide (WC) to prevent copper, iron and zinc from entering the material and affecting the quality.

[0078] 3) After aging, the concentration of the ternary material slurry is controlled at 35-50%, and the particle diameter distribution is D 50 =8~12μm, D0≥1μm; then enter the stirring tank filter 30, add dry powder, and use pure water and dilute alkali solution for slurry washing; after washing, the moisture content of the filter cake is less than 7%, the operation cycle is less than 2.5h, the solid content of the mother liquor is less than 0.1%, and the flatness of the filter cake is less than 10% of the thickness of the filter cake.

[0079] 4) The filter cake after filtering and washing enters the twin-screw dryer 50 through the solid discharge pipe 35 for drying. At this time, the crystal form retention rate of the ternary material is greater than 96%, thereby obtaining a high-quality ternary material product.

[0080] Practice has proved that after adopting the above-mentioned design system of the present invention, its single-line production capacity has increased by 6 to 10 times, from the original 400kg per batch to 2000 to 4000kg, and the production efficiency has been greatly improved; at the same time, 10,000 tons of production capacity has reduced production wastewater by 200,000 tons. Among them, the multifunctional integration concept in the process of the present invention organically unifies the pulping, washing, filtering, pre-drying and drying sections, has good adaptability to ternary materials, has large processing capacity, shortens the process flow, shortens the washing time, consumes less washing liquid, and generates less production wastewater, which obviously meets the current green manufacturing characteristics of efficiency increase, energy saving, consumption reduction and emission reduction.

[0081] The core equipment of the whole process of the present invention is the stirring tank filter 30, whose technical parameters are that the maximum diameter can be 3600mm and the effective filtering surface 32a is 10㎡. Its locking assembly 37, that is, the hydraulic gear meshing automatic opening and closing technology, provides a device basis for the full automatic realization of the filter, and the unloading time and the cylinder opening and closing time are greatly shortened. According to calculations, the opening and closing method of the stirring tank filter 30 with a diameter of 3200mm of the present invention can save more than 50 minutes compared with the traditional integral type and bolt quick opening type, as shown in the following table:

[0082] Table 1 Comparison of filter cylinder connection methods

[0083]

[0084] In summary, the technical characteristics of the device and process of the present invention are adapted to the process requirements of large-scale production of ternary materials, high requirements for water content and washing effect, high requirements for particle crystal form, high requirements for purity, and high requirements for closed operation. The production capacity can be increased by 6 to 10 times, which improves production efficiency. The actual power consumption of the core equipment, the stirred tank filter 30, is only 1 / 2 of the rated configuration power, which greatly reduces power consumption. According to calculations, the energy consumption of centrifugal equipment per 100kg in traditional processes is about 5.5kW·h, while the energy consumption of the stirred tank filter 30 per 100kg is about 0.8 to 1kW·h. Calculated based on an annual production capacity of 10,000 tons, it can save more than 4.5×105kW·h of energy. Compared with the existing ternary material production devices and production processes, the device and process of the present invention have been significantly improved in terms of efficiency increase, consumption reduction, emission reduction, automation, and process simplification, and meet the characteristics of green manufacturing.

Claims

1. An integrated production system for ternary materials, characterized in that: The invention comprises a stirring and mixing device (10) for stirring and mixing materials, a water washing kettle (20) for uniformly slurrying and providing a reaction space, a stirring tank filter (30) for realizing stirring and filtering operations of the materials, and a dryer for drying the materials, which are sequentially arranged along the travel path of the ternary material, wherein: The stirring tank filter (30) comprises a tank body formed by an upper shell (31) and a lower base (32) axially matched to each other, the upper shell (31) and the lower base (32) cooperate to form a cavity forming a washing chamber for washing materials, the lower base (32) is provided with a filtering surface (32a) with a water filtering function, the filtering surface (32a) divides the washing chamber into a stirring chamber and a water filtering chamber located below the stirring chamber; the stirring tank filter (30) further comprises a spraying assembly (33) for injecting a washing medium and a stirring assembly (34) for stirring the material in the stirring chamber; a feeding pipe and a solid discharge pipe (35) connected to the stirring chamber are arranged The upper shell (31) is provided with a water outlet pipe (36) connected to the water filter chamber, and the lower base (32) is provided with a water outlet pipe (36) connected to the water filter chamber. The upper shell (31) and the lower base (32) are locked to each other via a locking assembly (37), so that the tank body has two working states: assembled and disassembled. When the tank body is in the assembled state, the upper shell (31) and the lower base (32) are locked to each other via the locking assembly (37), so as to form the tank body. When the tank body is in the disassembled state, the locking assembly (37) is opened, and the lower base (32) moves downward and separates from the upper shell (31), so as to expose the filter surface (32a) located at the lower base (32) and the residual filter cake located on the filter surface (32a). The stirring assembly (34) comprises a stirring shaft (34a) coaxially arranged with the upper shell (31); the top end of the stirring shaft (34a) penetrates the top surface of the upper shell (31) and forms a power match with a power motor located above the upper shell (31); a stirring blade is arranged at the bottom end of the stirring shaft (34a); the stirring blade comprises a front inclined plate (34b), a rear inclined plate (34c) and a bottom plate (34d) extending radially outward from the stirring shaft (34a); the front inclined plate (34b) and the rear inclined plate (34c) The plate surface slope of the front inclined plate (34b), the rear inclined plate (34c) and the bottom plate (34d) decreases from the inside to the outside; the inner ends of the front inclined plate (34b), the rear inclined plate (34c) and the bottom plate (34d) are fixed to the shaft body of the stirring shaft (34a), and the outer ends of the front inclined plate (34b), the rear inclined plate (34c) and the bottom plate (34d) are closed by the end plate (34e), thereby forming a hollow triangular pyramid structure of the stirring blade; there is an angle between the plate surface of the bottom plate (34d) and the horizontal plane, and the stirring blades are arranged symmetrically along the circumferential axis of the stirring shaft (34a); The tip of the angle between the bottom plate (34d) and the horizontal plane points in the same direction as the rotation direction of the stirring shaft (34a); A plow blade (34f) is arranged on the front inclined plate (34b) of the stirring blade facing the stirring direction, which is convenient for cutting into and turning over the material. The plow blade (34f) is in the shape of an arc-shaped tile extending gently downward and forward from the plate surface of the front inclined plate (34b). The plow blades (34f) are evenly spaced on the front inclined plate (34b) along the radial direction of the stirring blade, and the travel paths of the plow blades (34f) on each stirring blade are staggered. An intermediate blade (34g) is also arranged on the bottom surface of the stirring shaft (34a), and the intermediate blade (34g) cooperates with the travel paths of the plow blades (34f) on each stirring blade to form a full circle.

2. An integrated production system for ternary materials according to claim 1, characterized in that: The locking assembly (37) comprises a locking ring (37a) coaxially rotatably engaged with the bottom edge of the upper shell (31), the lower ring surface of the locking ring (37a) extending vertically downward along the axial direction of the upper shell (31), and the lower ring surface of the locking ring (37a) is provided with a snapping tooth (37b) protruding radially inward; the outer wall of the lower base (32) is in the shape of a two-stage stepped shaft with a thin upper part and a thick lower part, and the outer wall of the large diameter section of the lower base (32) is provided with a radially protruding mating tooth (37c), each mating tooth (37c) ) are evenly distributed along the circumference of the lower base (32); in the circumference of the locking ring (37a), the distance between adjacent engaging teeth (37b) is greater than the width of the matching teeth (37c), so that the matching teeth (37c) can pass through the gaps between the engaging teeth (37b) from bottom to top; when the tank body is in an assembled state, the bottom surface stop of the engaging teeth (37b) is matched with the top surface of the matching teeth (37c), so that the shaft shoulder of the lower base (32) is sealed and pressed from bottom to top against the bottom edge of the upper shell body (31).

3. An integrated production system for ternary materials according to claim 2, characterized in that: The stirring tank filter (30) also includes a support assembly for lifting the upper shell (31) off the base surface; the support assembly includes support legs (38a) uniformly distributed around the circumference of the upper shell (31); support ear seats (38b) are uniformly distributed around the outer wall of the upper shell (31) in a manner corresponding to the number of support legs (38a); the top end of the bottom end of each support leg (38a) is fixedly connected to the corresponding support ear seat (38b); the piston cylinder end of the hydraulic cylinder (32d) is hingedly connected to the support ear seat (38b); the piston rod end of the hydraulic cylinder (32d) extends vertically downward and is hingedly connected to the connecting ear plate (32b) fixed to the lower base (32); the hydraulic cylinder (32d) is in more than two groups and is uniformly distributed in sequence around the circumference of the lower base (32).

4. An integrated production system for ternary materials according to claim 3, characterized in that: The locking ring (37a) generates a rotation thrust through a power oil cylinder arranged at the upper shell (31); a rotation-stopping section (37d) extends vertically upward at the engaging teeth (37b), and a matching groove (37e) is concavely provided at a corresponding matching position of the upper shell (31); when the tank body is in an assembled state, the rotation-stopping section (37d) is inserted into the matching groove (37e).

5. An integrated production system for ternary materials according to claim 4, characterized in that: The inner ring surface of the locking ring (37a) is in the shape of a two-stage stepped hole that is thin at the top and thick at the bottom. The bottom edge of the upper shell (31) is arranged with an outer flange (31a), and a surface-fitting rotational fit relationship is formed between the upper surface of the outer flange (31a) and the hole shoulder of the locking ring (37a); the meshing teeth (37b) are in the shape of a wedge block, and the tip of the meshing teeth (37b) points to the locking rotation direction of the lower base (32).

6. An integrated production system for ternary materials according to claim 3, 4 or 5, characterized in that: The lower base (32) is provided with a moving wheel (32c); a track (39) is laid on the base surface for the moving wheel (32c) to cooperate with when falling; and an anti-deflection guard plate (39a) is arranged outside the track (39) to prevent the moving wheel (32c) from running off.

7. The integrated production system for ternary materials according to claim 1, characterized in that: A transverse partition (34h) is arranged in the cavity of the stirring blade, and a matching gap exists between the front end of the transverse partition (34h) and the end plate (34e), thereby dividing the cavity of the stirring blade into an upper heating chamber and a lower heating chamber that are connected to each other only by the matching gap; a heating inlet (34i) and a heating outlet (34j) are arranged in the stirring shaft (34a), and the heating inlet (34i) and the heating outlet (34j) are connected to the corresponding upper heating chamber and lower heating chamber respectively.

8. An integrated production system for ternary materials according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The integrated production system further comprises a three-way material transport pipe (40), the inlet pipe of the three-way material transport pipe (40) being connected to the outlet of the solid discharge pipe (35); the dryer is a twin-screw dryer (50), and the two groups of outlet pipes of the three-way material transport pipe (40) are respectively connected to the inlet of one group of the twin-screw dryer (50); and a material switching valve (60) for selecting one group of outlet pipes for discharge is arranged at the three-way joint of the three-way material transport pipe (40).

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