A Stirred Tank Filter for Green Manufacturing Based on Ternary Materials

Abstract

The present invention relates to the technical field of ternary material manufacturing, and particularly relates to a stirred tank filter for green manufacturing of ternary materials. The present invention includes a tank body formed by axially mating an upper shell and a lower base with each other, and a filtering surface with a water filtering function is provided at the lower base; the filter also includes a spraying assembly and a stirring assembly; a feed pipe and a solid discharge pipe communicating with the stirring chamber are arranged at the upper shell, while a water outlet pipe communicating with the water filtering chamber is arranged at the lower base; the upper shell and the lower base are locked to each other through a locking assembly. The present invention can meet the process requirements of large production scale of ternary materials, high requirements for water content, washing effect, particle crystal form, purity, and closed operation, while effectively ensuring its own production capacity and production efficiency, and simultaneously meeting the green manufacturing characteristics of increasing efficiency, saving energy, reducing consumption, and reducing emissions required by current green manufacturing.

Description

Technical Field

[0001] The present invention relates to the technical field of ternary material manufacturing, and particularly relates to a stirred tank filter for green manufacturing of ternary materials. Background Art

[0002] Lithium-ion batteries were 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 environmental friendliness. Currently, lithium-ion batteries have become the preferred power source for electronic products such as laptop computers, mobile phones, digital cameras, flashlights, etc.; ternary materials are one of the main components of the positive electrode of current lithium-ion batteries. Traditional methods for synthesizing ternary materials mainly include high-temperature solid-phase method, low-temperature solid-phase method, sol-gel method, co-precipitation method, etc.; however, the materials obtained by the solid-phase method have uneven phase and particle size, and lithium volatilization will occur at high temperature; the co-precipitation method has a lower cost and relatively uniform product mixing, but the process for preparing the precursor by the co-precipitation method is complex, and the precipitation rates of different cations are different; in the sol-gel method, the materials are obtained in the liquid phase, and the ions can be fully mixed to obtain pure-phase materials, but there are many factors affecting the gel, and the morphology and particle size of the product are not easy to control. Therefore, people have gradually started to first use the co-precipitation method to synthesize ternary precursors and then use the high-temperature solid-phase method to synthesize the final product, that is, the co-precipitation-high temperature solid-phase method, which is currently a more mature technology and widely used in industry.

[0003] When producing ternary materials by the co-precipitation-high temperature solid-phase method, 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 includes stirring and mixing equipment, reaction kettles, automatic centrifuges, filters, dryers, etc. arranged in sequence along the production process. There are problems such as a long process route and many equipment. The entire process has high energy consumption, limited efficiency, large consumption of washing liquid, and also increases the risks of difficult control of ternary material quality and high cost. Obviously, it does not have the characteristics of increasing efficiency, saving energy, reducing consumption, and reducing emissions required by current green manufacturing. Especially for the filtration and washing stage, most ternary material manufacturers are used to using automatic centrifuges to achieve this process. An automatic centrifuge is a filtration type, automatically discharging from the bottom, intermittent centrifuge. Its mechanism is to form a centrifugal force field with a separation factor of 700-1000 through the high-speed rotation of the rotor system. The ternary material is accelerated in the centrifugal force field, and the solid-liquid separation speed is relatively fast. The obtained filter cake has a low moisture content, which can improve the drying efficiency in the subsequent drying stage to a certain extent. However, the problems existing in using an automatic centrifuge to achieve the filtration and washing process of ternary materials are as follows: First, the technical parameters of the automatic centrifuge are limited; currently, the automatic centrifuges with a wide industrial application range have a rotor diameter of 1250mm and 1500mm, and the theoretical maximum processing capacity is about 500kg per batch, with a small processing volume. Second, the washing method is backward and the washing effect is poor; the washing method of the automatic centrifuge belongs to displacement washing. When the filter cake thickness on the circumferential drum surface is relatively thick, the washing liquid needs to be rinsed from the inside to the outside, with a long washing time, a large consumption of washing liquid, and uneven material washing. Third, the power consumption per unit is relatively large; the automatic centrifuge with a rotor diameter of 1250mm is equipped with a power of 22kW, and there is an alternating speed increase - speed decrease during operation, resulting in large power consumption. Finally, due to the production characteristics of ternary materials themselves, there are a large number of residual materials; and ternary materials are produced batch by batch discontinuously. After the previous batch is produced, the whole machine needs to be cleaned immediately to avoid the influence of the residual materials of the previous batch of materials in the drum on the finished product quality of the subsequent batch of materials. The traditional cleaning operation requires personnel to open the machine cover and manually clean, and even needs to drill into the semi-closed automatic centrifuge for cleaning, which is time-consuming, laborious and has poor safety, and at the same time, the cleaning effect is obviously not satisfactory. Then, is it possible to develop a new type of integrated filtration equipment that can replace the traditional automatic centrifuge, so as to adapt to the process requirements of large production scale, high water content, high washing effect requirements, high particle crystal form requirements, high purity requirements, and high closed operation requirements of ternary materials, while effectively ensuring its own production capacity and production efficiency, and simultaneously meeting the green manufacturing characteristics of increasing efficiency, saving energy, reducing consumption, and reducing emissions required by current green manufacturing, which is a technical problem urgently to be solved in this field in recent years. Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a stirring tank type filter machine for green manufacturing based on ternary materials, which has a reasonable structure and high cost performance. It can adapt to the process requirements of large production scale of ternary materials, high requirements for water content, washing effect, particle crystal form, purity, and closed operation, while effectively ensuring its own production capacity and production efficiency, and simultaneously meeting the green manufacturing characteristics of increasing efficiency, saving energy, reducing consumption, and reducing emissions required by current green manufacturing.

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

[0006] A stirring tank type filter machine for green manufacturing based on ternary materials, characterized in that: it includes a tank body formed by axially mating an upper shell and a lower base with each other. The cavity formed by the cooperation of the upper shell and the lower base constitutes a washing cavity for washing materials. A filtering surface with a water filtering function is provided at the lower base. The filtering surface divides the washing cavity into a stirring cavity and a water filtering cavity located below the stirring cavity. This filter machine also includes a spraying assembly for injecting a washing medium and a stirring assembly for performing a stirring operation on the materials in the stirring cavity. The feed pipe and the solid discharge pipe communicating with the stirring cavity are arranged on the upper shell, while the water discharge pipe communicating with the water filtering cavity is arranged on the lower base. The upper shell and the lower base are locked to each other through 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 through 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 descends and disengages from the upper shell, thereby exposing the filtering surface located at the lower base and the residual filter cake located on the filtering surface.

[0007] Preferably, the locking assembly includes a locking ring rotatably and coaxially fitted at the bottom edge of the upper shell. The lower ring surface of the locking ring extends vertically downward along the axis of the upper shell, and a biting tooth protrudes radially inward at the lower ring surface of the locking ring. The outer wall of the lower base is in the shape of a two-stage stepped shaft with a thinner upper part and a thicker lower part. A mating tooth protrudes radially on the outer wall of the large diameter section of the lower base, and the mating teeth are evenly distributed in sequence along the circumference of the lower base. In the circumferential direction of the locking ring, the distance between adjacent biting teeth is greater than the width of the mating teeth, so that the mating teeth can pass through the gaps between the biting teeth from bottom to top. When the tank body is in the combined state, the bottom stop of the biting tooth is matingly fitted with the top surface of the mating tooth, thereby tightly pressing the shoulder of the lower base against the bottom edge of the upper shell in a sealed manner from bottom to top.

[0008] Preferably, the filter press further includes a support assembly for lifting the upper housing from the base surface; the support assembly includes support legs evenly distributed circumferentially around the upper housing, and support lugs are evenly distributed circumferentially on the outer wall of the upper housing corresponding to the number of each support leg. A fixed connection is formed between the bottom and top ends of each support leg and the corresponding support lugs; the piston cylinder end of a hydraulic cylinder is hinged at the support lug, and the piston rod end of the hydraulic cylinder extends vertically downward and forms a hinged connection with a connecting ear plate fixed to the lower base; there are two or more hydraulic cylinders and they are evenly distributed in sequence along the circumference of the lower base.

[0009] Preferably, the locking ring generates a rotary thrust through a power cylinder arranged on the upper housing; a rotation stopping section extends vertically upward at the engaging teeth, and a mating groove is recessed at the corresponding mating position of the upper housing; when the tank body is in the combined state, the rotation stopping section is inserted into the mating groove.

[0010] Preferably, the inner ring surface of the locking ring is in the shape of a two-stage stepped hole that is thinner at the top and thicker at the bottom, and a turned-up edge is arranged at the bottom edge of the upper housing. A surface fitting rotary mating relationship is formed between the upper surface of the turned-up edge and the shoulder of the hole of the locking ring; the shape of the engaging teeth is a wedge-shaped block, and the tip of the engaging teeth points to the locking rotation direction of the lower base.

[0011] Preferably, moving wheels are arranged at the lower base; a track for the moving wheels to fall into is laid on the base surface; an anti-deviation guard plate for preventing the moving wheels from running off is arranged outside the track.

[0012] Preferably, the stirring assembly includes a stirring shaft coaxially arranged with the upper housing. The top end of the stirring shaft penetrates through the top surface of the upper housing and forms a power connection with a power motor located above the upper housing. 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. The slope of the plate surfaces of the front inclined plate and the rear inclined plate decreases 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 end plates, thus forming a hollow triangular pyramid structure of the stirring blade; an angle exists between the plate surface of the bottom plate and the horizontal plane, and each stirring blade is axially symmetrically arranged along the circumference of the stirring shaft.

[0013] Preferably, plow blades for facilitating the cutting and turning of materials are arranged on the front inclined plate of the stirring blade facing the stirring direction. The shape of the plow blade is an arc-shaped tile-like shape that gently extends downward and forward from the plate surface of the front inclined plate. Each plow blade is evenly spaced along the radial direction of the stirring blade on the front inclined plate, and the traveling paths of the plow blades on each stirring blade are staggered from each other; an intermediate blade is also arranged at the bottom surface of the stirring shaft, and the intermediate blade and the traveling paths of the plow blades on each stirring blade cooperate to form a complete circle.

[0014] Preferably, a transverse partition is arranged in the cavity of the stirring blade, and there is a matching gap between the front end of the transverse partition and the end plate, so as to divide the cavity of the stirring blade into an upper heating cavity and a lower heating cavity that are only connected to each other through 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 communicated with the corresponding upper heating cavity and lower heating cavity.

[0015] Preferably, the filtering surface is a metal filter plate or a filter cloth; the inlet of the solid discharge pipe is equal to or higher than the height of the filtering surface.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1). The traditional centrifuge-type filtering structure with small processing capacity and low efficiency is abandoned, and a stirring tank-type filtering layout is adopted instead, so as to utilize the large-capacity and one-time material processing characteristics of the stirring tank to meet the process requirements of high production scale, low water content and high washing effect of ternary materials. Specifically, in actual use, first, the ternary material enters the stirring cavity through the feed pipe, and a spraying component such as a nozzle synchronously sprays a washing medium, and a stirring component such as a stirring paddle or even a stirring disc performs a stirring operation. While the ternary material is being washed and stirred, the generated washing waste liquid leaks down along the filtering surface into the water filtering cavity and is drained out by the water outlet pipe. The completely washed ternary material is then discharged from the chamber through the solid discharge pipe, and so on. In the above operation, whenever a batch of ternary material is washed, a chamber washing operation needs to be performed. At this time, due to the separable characteristic of the tank body, the locking component can be opened and the lower base or the upper shell can be removed, so that the filtering surface located on the lower base can be exposed, and then the residual filter cake at the filtering surface and even on the inner wall of the tank can be quickly and efficiently removed, and the use is extremely convenient.

[0018] Obviously, as can be seen from the above, the present invention can meet the process requirements of large production scale, high water content, high washing effect, high particle crystal form requirement, high purity requirement and high closed operation requirement of ternary materials, while effectively ensuring its own production capacity and production efficiency, and simultaneously meeting the green manufacturing characteristics of increasing efficiency, saving energy, reducing consumption and reducing emissions required by current green manufacturing; after adopting the above process of the present invention, its single-line production capacity is increased by 6 to 10 times, from the original 400 kg per batch to 2000 to 4000 kg, and the production efficiency is greatly improved; at the same time, 200,000 tons of production wastewater is reduced for every 10,000 tons of production capacity; and the actual power consumption of the core equipment, the stirring tank-type filter, is only 1 / 2 of the rated configured power, greatly reducing the power consumption. After calculation, the energy consumption of the centrifugal equipment in the traditional process is about 5.5 kW·h per 100 kg, and the energy consumption of the stirring tank-type filter of the present invention is about 0.8 to 1 kW·h per 100 kg. Calculated according to the annual production capacity of 10,000 tons, the energy consumption can be saved by more than 4.5×10^5 kW·h, and the effect is remarkable.

[0019] 2) For the locking assembly, there are various locking methods. For example, the threaded screwing method can be used, or the positioning pin or positioning column can be inserted for locking, or even the external force of the hydraulic cylinder group can be directly used to press against to ensure the tight sealing function of the lower base relative to the upper housing, and so on. As a further preferred solution 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 relative to the mating teeth at the lower base, thereby ensuring the sealing fit purpose of the lower base relative to the upper housing. Compared with the uncertainty of the fit of the positioning pin or positioning column inserted for locking, the cumbersome operation of the threaded screwing method, and the instability of the work of the pure hydraulic cylinder group applying force, the locking ring locking structure of the present invention can ensure the fit stability and certainty of the tank body in the combined state, and simultaneously ensure the convenience of operation, achieving multiple benefits with one action.

[0020] 3) During actual operation, the present invention should be far away from the base surface such as the ground, etc., so as to leave an activity space for the lower base to move. The lower base is driven by a number of circumferentially evenly distributed hydraulic cylinders to generate a mechanized controllable lifting action, so that when the lower base is separated from the upper housing, the stability, reliability and safety of the entire separation operation can always be ensured.

[0021] 4) Since the present invention is calibrated for the 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 also one of the fundamental reasons why the lower base needs to be driven by a hydraulic cylinder. At the same time, the locking ring also needs to be driven by a power cylinder to ensure the rotation action of the locking ring. And due to the integral fit structure formed by the power cylinder between the locking ring and the upper housing, once the locking ring moves, it may drive the lower base to generate a follow-up deflection action under high friction, which needs to be avoided. Therefore, through the design of the anti-rotation section and the mating groove of the present invention, once the lower base is axially inserted into the locking ring, the anti-rotation section at the lower base naturally inserts into the mating groove at the upper housing and forms an anti-rotation fit, thereby avoiding the accidental follow-up rotation action of the lower base.

[0022] 5) Due to the large structure of the locking ring, during actual operation, it can be simply stuck on the outward-turned edge of the upper housing by its own gravity. If necessary, the lubrication effect between the upper surface of the outward-turned edge and the hole shoulder of the locking ring can be improved by oil lubrication or grease lubrication. The special wedge shape of the engaging teeth is for the purpose of facilitating the faster insertion of the lower base into the engaging teeth of the locking ring, which will not be elaborated here.

[0023] 6) The design of the moving wheels and the tracks facilitates the rapid reception of the lower base by the base surface during cleaning, and more cleaning space can be vacated by the side movement of the lower base along the tracks. The anti-deviation guard plate is for guiding the traveling path of the moving wheels.

[0024] 7) As another highlight of the present invention, based on the conventional stirring structure of combining stirring blades with a stirring shaft, the stirring assembly of the present invention newly adds a heating type material turning and a propelling type blade structure. Specifically, the stirring blade individually presents a happy triangular frustum structure. On the one hand, by utilizing the unique inclined surface of the stirring blade, it ensures the turning type washing of the ternary material and the pushing function from the inside to the outside, so as to improve the washing effect of the ternary material and ensure the slow-speed advancing function of the ternary material towards the solid discharge pipe. On the other hand, a transverse partition is arranged in the hole cavity of the stirring blade, thus transforming the traditional stirring blade into a heating type blade, and on the basis of the above-mentioned washing and filtering functions of the present invention, realizing the preheating function of the material after washing and filtering. 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

[0025] Figure 1 is a schematic diagram of the working state of the present invention;

[0026] Figure 2 is a schematic cross-sectional structure diagram of the present invention when the tank body is in the combined state;

[0027] Figure 3 is a diagram of the mating state of the lower base and the base surface when the tank body is in the disassembled state;

[0028] Figure 4 is a diagram of the mating state of the anti-rotation section and the mating groove;

[0029] Figure 5 is Figure 2 a partially enlarged view of part I of

[0030] Figure 6 is Figure 2 a partially enlarged view of part II of

[0031] Figure 7 is a schematic diagram of the structure of the stirring blade;

[0032] Figure 8 is Figure 7 the left view of

[0033] Figure 9 is a schematic diagram of the working state of the material switching valve.

[0034] The actual corresponding relationship between the reference numerals and component names of the present invention is as follows:

[0035] 10 - Stirring and mixing equipment 20 - Water washing kettle 30 - Stirring tank type filter

[0036] 31 - Upper shell 31a - Outer flanging 32 - Lower base

[0037] 32a - Filter surface 32b - Connecting ear plate 32c - Moving wheel 32d - Hydraulic cylinder

[0038] 33 - Spraying assembly 34 - Stirring assembly

[0039] 34a - Stirring shaft 34b - Front inclined plate 34c - Rear inclined plate 34d - Bottom plate 34e - End plate

[0040] 34f - Plow blade 34g - Intermediate blade 34h - Diaphragm

[0041] 34i - Heating inlet 34j - Heating outlet

[0042] 35 - Solid discharge pipe 36 - Water outlet pipe 37 - Locking assembly

[0043] 37a - Locking ring 37b - Biting teeth 37c - Fitting teeth

[0044] 37d - Anti - rotation section 37e - Fitting groove

[0045] 38a - Support leg 38b - Support ear seat

[0046] 39 - Track 39a - Anti - deviation guard plate

[0047] 40 - Three - way material conveying pipe 50 - Twin - screw dryer 60 - Material switching valve Detailed implementation manners

[0048] For ease of understanding, in combination with the overall production system and process of ternary materials, the specific structure and working mode of the present invention are further described as follows:

[0049] The production system based on ternary materials provided by the present invention takes the stirred - tank filter 30 as the main body, and organically unifies functions such as closed - pressure filtration, stirring, pulping and washing, automatic rotary discharging, and self - heating into the stirred - tank filter 30, making the overall structure compact and optimized, thus effectively shortening the process flow. On the basis of the structure of the stirred - tank filter 30, a high - efficiency water - washing kettle 20 is equipped in its front - end process to fully disperse and react the materials; a twin - screw dryer 50 is equipped at its rear - end to enable the materials to be fully mixed and efficiently dried without damaging the crystal form of the materials, and finally high - quality ternary materials are obtained, and the whole process has the characteristics of green manufacturing.

[0050] More specifically, the production system based on ternary materials involved in the present invention, as Figures 1 - 9 shown, mainly consists of a stirring and mixing device 10, a water - washing kettle 20, a stirred - tank filter 30, a material switching valve 60, a twin - screw dryer 50, etc. Among them:

[0051] Stirring and mixing device

[0052] The stirring and mixing equipment 10 mainly mixes Ni, Co, Mn ion mixtures, pure water, lye, etc. The rotation speed of mixing, the structure of the stirring paddle, the baffle plate, etc. are the key factors affecting the mixing effect. The washing kettle 20 is the equipment for uniformly pulping and reacting the mixed materials and is also the core equipment for obtaining the precursor.

[0053] The stirring and mixing equipment 10 usually includes a stirring tank. The structural characteristics such as the size of the kettle body of the stirring tank, the type of stirrer, the rotation speed, the number of baffles, the type and size, and the feeding position are all the key factors affecting the reaction. Similarly, the diameter, number, and type of the stirring paddles also need to be set according to technical parameters such as the volume and diameter of the stirring and mixing equipment 10. The baffle plates uniformly arranged on the barrel wall of the stirring and mixing equipment 10 help to improve the mixing effect.

[0054] Washing kettle

[0055] Before the materials are filtered, beaten, washed, and pre-dried in the stirred tank filter 30, a washing kettle 20 for uniformly pulping and reacting needs to be set up. As Figure 1 shown, an anchor stirrer is provided at the central position of the washing kettle 20, and an anchor paddle is provided inside it. The rotation speed is relatively low, generally less than 100 r / min; the highest position of the anchor paddle must be below the liquid level. To prevent the anchor paddle from rubbing against the barrel wall of the washing kettle 20, there is generally a certain safety distance of 10 - 20 mm. The anchor paddle is also provided with several scraping plates, and the scraping plates are generally made of plastics such as polytetrafluoroethylene. The distance between the scraping plates and the barrel wall of the washing kettle 20 is relatively small, which can be less than 5 mm, and is used to prevent the materials from accumulating on the barrel wall. In addition, at the non-central position of the barrel wall of the washing kettle 20, that is, the position avoiding the anchor stirrer, a high-speed disperser is also laterally arranged. The main shaft of the high-speed disperser is provided with a serrated dispersing disk, and the diameter is generally relatively small, about 200 - 600 mm, and can be specifically set according to technical parameters such as the volume, diameter, and rotation speed of the reaction kettle. The rotation speed of the high-speed disperser is relatively high, generally 1000 - 2000 r / min. Under the dual action of the anchor stirrer and the high-speed disperser, the materials can be fully mixed to achieve the purpose of efficient pulping and reaction.

[0056] Stirred tank filter

[0057] The stirred tank filter 30 is the innovation point of the present invention and is also the core equipment of the whole system. Its functions integrate various functions such as solid-liquid filtration, beating, washing, and impurity removal, and pre-drying, greatly shortening the process flow and efficiently realizing solid-liquid separation.

[0058] The specific structure of the stirred tank filter 30 refers to Figures 2 - 8, considering automation and intelligence, and for 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 the mating of an upper shell 31 and a lower base 32. To prevent metal elements such as iron, zinc, and copper from entering the ternary material and affecting the product quality, the parts of the tank body and the subsequent structures that come into contact with the ternary material need to be sprayed with tungsten carbide or other wear-resistant materials.

[0059] The outer wall of the lower base 32 is in the shape of a two-stage stepped shaft with a thinner upper part and a thicker lower part, 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 performance between the two; if necessary, seals such as Figure 6 shown can be added to enhance the sealing fit between the two. 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 firm fit between the lower base 32 and the upper shell 31 and the external sealing effect. As Figures 2 - 3 shown, a filtering surface 32a formed by a filtering material such as a metal filter net or filter cloth is laid on the top surface of the lower base 32. Once the tank body is assembled, the filtering surface 32a naturally forms a double-layer cavity structure with the upper part of the cavity of the tank body as the stirring cavity and the lower part as the water filtering cavity. At the same time, as can be seen in Figure 2 , 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 spraying 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 the ternary material and the washing medium and the discharge function of the washing waste liquid. The solid discharge pipe 35 is arranged on the side of the upper shell 31 for easy discharging. The size of the solid discharge pipe 35 is determined according to process parameters such as the volume of the cylinder body and the slag content. The solid discharge pipe 35 is connected with an automatic discharge valve, such as a hydraulic automatic opening and closing plunger type discharge valve or an electric screw rod driven opening and closing plunger type discharge valve, etc., to achieve the purpose of automatic discharging as required; if necessary, through the setting of sensors and program interlocking, intelligence can also be realized.

[0060] During actual operation, as Figures 2 - 5 shown, the locking assembly 37 includes a locking ring 37a. The outer shape of the ring cavity of the locking ring 37a is in the shape of a two-stage stepped hole with a thinner upper part and a thicker lower part. An outward flange 31a is arranged at the bottom edge of the lower shell; during assembly, by coaxially sleeving the locking ring 37a on the outer wall of the lower shell and using the surface fit and rotational cooperation between the shoulder of the hole of the locking ring 37a and the top surface of the outward flange 31a, the rotational working purpose of the locking ring 37a is achieved. Considering the huge mass of the locking ring 37a, if necessary, the two ends of a power cylinder can be respectively hinged to the outer wall of the upper shell 31 and the locking ring 37a, so as to utilize the hydraulic pressure of the power cylinder to ensure the function of applying a 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. For the lower base 32, as Figures 3 - 4As shown, a number of mating teeth 37c are axially and evenly distributed on the outer wall of the large-diameter section of the lower base 32.

[0061] When the combination operation of the tank body is required, first lift the lower base 32 and coaxially insert it into the upper shell 31. Then, driven by the hydraulic pressure of the power cylinder, the locking ring 37a rotates, driving the engaging teeth 37b to rotate, so as to lock or release with the mating teeth 37c. Figure 2 In one implementation, that is, when the locking ring 37a rotates clockwise, the mating teeth 37c and the engaging teeth 37b are engaged and locked with each other; conversely, the mating teeth 37c and the engaging teeth 37b are released and disengaged from each other. To prevent the lower base 32 from spinning during the meshing process due to the meshing friction force of the engaging teeth 37b, resulting in meshing failure, any two or more evenly distributed mating teeth 37c among the evenly distributed mating teeth 37c 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 stop section 37d as shown in Figure 4 As shown, a mating groove 37e is milled at the corresponding position of the upper shell 31 to cooperate with the stop section 37d, forming an anti-rotation cooperation structure similar to the cooperation between a keyway and a key. Since the upper shell 31 is fixed, the degree of freedom in the circumferential direction of the lower base 32 is eliminated under the cooperation of the stop section 37d and the mating groove 37e at the anti-rotation teeth, and it will not rotate during the meshing process.

[0062] Through the above-mentioned automatic opening and closing technology of the large-diameter cylinder hydraulic tooth-engaging cylinder flange, the present invention can realize the automatic opening and closing operation of the full series of hydraulic tooth-engaging cylinder flanges with diameters between 2000 mm and 3200 mm, with remarkable results.

[0063] Furthermore, during the meshing rotation, the hole shoulder of the locking ring 37a and the corresponding surface at the flanged edge 31a of the upper shell 31 are the force-bearing surfaces that interact with each other. When the engaging teeth 37b and the mating teeth 37c are engaged 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. To ensure smooth rotation of the locking ring 37a during the locking process, an oil groove is arranged at the hole shoulder of the locking ring 37a. During use, an appropriate amount of lubricating 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 at the hole shoulder of the locking ring 37a, which can also play a lubricating function.

[0064] Furthermore, to achieve automation and intelligence, as shown in 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, and automatically add washing liquid, etc. according to the material weight in proportion, so as to achieve intelligence. The support ear seat 38b is generally set to two or three and evenly distributed. At the same time, as shown in Figure 2As shown, the lower base 32 and the support ear seat 38b are connected to each other by a hydraulic cylinder 32d; the piston cylinder end of the hydraulic cylinder 32d is hinged to the bottom surface of the support 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 fixedly connected to the lower base 32, so that the lower base 32 has a mechanical lifting function in the vertical direction through the telescopic function of the hydraulic cylinder 32d in the vertical direction.

[0065] In addition, moving wheels 32c are provided at the bottom of the lower base 32. The moving wheels 32c are preferably arranged in four. Generally, the front two are universal wheels for guiding; the rear two are fixed wheels. To prevent the lower base 32 from colliding with and damaging the equipment due to difficult-to-control guiding during movement, and also to prevent damage to the base surface due to the relatively large weight of the lower base 32, generally a track 39 needs to be correspondingly provided at the base surface. When the locking assembly 37 is loosened and the lower base 32 drops under the drive of the hydraulic cylinder 32d, the moving wheels 32c directly enter the track 39, which is convenient to move and has a fixed direction. To prevent deviation, an anti-deviation guard plate 39a can be provided on the outer side of the track 39 as Figure 3 shown. The height of the anti-deviation guard plate 39a is slightly shorter than the diameter of the moving wheel 32c. The track 39 is generally made of steel plate, which can reduce the friction force, facilitate the movement of the lower base 32, and also protect the epoxy floor paint surface in the factory area.

[0066] Furthermore, in order to reduce the power consumption of the stirred tank filter 30 and achieve green energy conservation, the present invention also improves the structure of the stirring assembly 34. On the basis of retaining the structure of the stirring blades, the stirring shaft 34a and the power motor of the traditional stirring assembly 34, the present invention designs the stirring blades as a hollow triangular pyramid structure to achieve multiple purposes of light weight, self-heating, self-turning of materials and self-pushing of materials.

[0067] Specifically, as Figure 2 and Figures 7 - 8As 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 have the same size, are balanced on both sides, and the working force is more balanced. Taking the stirring blades on one side as an example, it is composed of a front inclined plate 34b, a rear inclined plate 34c, a bottom plate 34d and an end plate 34e to form a hollow cavity structure with a triangular cross-section. The triangular cross-section of the hollow cavity of the stirring blade decreases from the center to the outside at a certain slope. Its large end, that is, the inner end, is welded and fixed to the mounting seat at the stirring shaft 34a, and the small end, that is, the outer end, extends to the barrel wall of the upper shell 31, and finally forms a triangular pyramid frustum structure similar to a conical frustum. In the cross-section of the stirring blade, since the front inclined plate 34b and the rear inclined plate 34c have the same shape and are symmetrical, 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 7-12°, which can avoid the friction between the entire plane of the bottom plate 34d and the material. During actual scraping, only the blade part of the plow blade cuts into the filter cake, which is a linear contact and causes less damage to the filter cake crystals; and the plow blades 34f are arranged in multiple pieces at intervals, which also reduces the extrusion force on the filter cake and is beneficial to maintaining the crystal form, thus avoiding the unfavorable situation of both damaging the crystal shape and consuming power. Because the triangular cross-section of the hollow cavity of the stirring blade decreases from the center to the outside at a certain slope, when the entire paddle rotates, it will generate a thrust outward, pushing the material from the center to the outside until it is slowly discharged through the solid discharge pipe 35. The front inclined plate 34b of each stirring blade is also intermittently welded with plow blades 34f. From Figure 6 it can be seen that the circular trajectories drawn by each plow blade 34f intersect 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 for scraping the material directly below the stirring shaft 34a that cannot be scraped by the plow blades 34f. In the top view direction, the circular trajectories drawn by each plow blade 34f, combined with the rotation trajectory of the intermediate blade 34g, should cooperate with each other to form a complete circle to cover the entire filter surface 32a of the stirred tank filter 30. The arc-shaped tile-shaped plow blade design of the plow blade 34f is also more convenient for cutting into the material and turning the material.

[0068] On the basis of the above lightweight, self-turning and self-pushing structures of the stirring blade, the stirring blade also has a self-heating function. Specifically, taking the stirring blade on one side as an example, a transverse partition 34h is also welded to the triangular hollow cavity of the stirring blade. In addition to strengthening the strength of the hollow cavity and enabling the stirring blade to withstand the filtration pressure, it also divides the triangular hollow cavity into an upper heating cavity and a lower heating cavity. Figure 6As can be seen, there is a mating gap between the stirring blade and the end plate 34e, enabling the upper heating chamber and the lower heating chamber to communicate with 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. During the pre-drying stage of the ternary material, a heat source such as steam can be introduced into the center of the stirring shaft 34a, enter through the heating inlet 34i, reach the lower heating chamber through the upper heating chamber and the mating gap, and finally be discharged through the heating outlet 34j to form a heat exchange path. The other stirring blade is also arranged in this way. In this way, the stirring blade can directly carry the heat source to pre-dry the ternary material, and during the drying process, the stirring blade can also rotate and turn over the material, making the heat transfer efficiency higher and the heating process of the ternary material more uniform.

[0069] Twin-screw dryer

[0070] The twin-screw dryer 50 is a low-shear and high-efficiency drying equipment. The twin-screw dryer 50 can revolve and rotate at a low speed with good mixing effect, but has a low stirring intensity and weak shear force, which can ensure the integrity of the crystal form of the material and the product quality. Since the material drying cycle is relatively long, to ensure the process matching, 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, 1 stirring tank filter 30 is matched with 2 twin-screw dryers 50 to make the process times cooperate with each other.

[0071] As Figure 9 shown, in actual design, the material switching valve 60 is provided at the joint of the three-way material conveying pipe 40, and the valve plate is deflected by a cylinder to achieve the rapid switching function of the material at the two groups of outlet pipes of the three-way material conveying pipe 40. The deflection position of the valve plate is sensed by a sensor. According to this signal, it can be known which outlet pipe and the twin-screw dryer 50 the current material enters. To prevent the accumulation of material in the upper space of the valve plate, nozzles can be arranged on the circumference of the upper space of the valve plate to blow with compressed air regularly to prevent the accumulation of materials. If the outlet pipe is relatively long, an air hammer can be set outside it to vibrate the outlet pipe regularly to prevent the accumulation of materials. Similarly, 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 conveying pipe 40 in contact with the material needs to be sprayed with tungsten carbide or other wear-resistant materials.

[0072] After the material is filtered, slurried and washed, and pre-dried in the agitated 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 conveying pipe 40. A heat source can be introduced into the twin-screw dryer 50. Under the dual actions of the revolution and rotation of the twin-screws, the material is fully mixed and dried with the heat source. 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 vacuum pumping. To prevent the material from being sucked away, a dust collector can also be provided at the twin-screw dryer 50, with a filter element inside. The number, material, and precision of the filter elements are determined according to actual needs. A vacuum port is provided at the upper part of the dust collector. When vacuum pumping, if material dust is sucked, it will be intercepted by the filter element on the outer filter surface of the filter element. After the vacuum pumping is completed, backwashing can be carried out through the provided backwashing port to blow the material dust intercepted on the outer filter surface of the filter element into the twin-screw dryer 50. The filter element can also be set so that the material dust is intercepted on the inner filter surface of the filter element during vacuum pumping, which can be specifically determined according to the filter element structure type.

[0073] During specific operation, to ensure smooth solid discharge and transportation of the agitated tank filter 30, generally the agitated tank filter 30 is installed on the upper floor or platform to have a certain height; while the twin-screw dryer 50 is installed at a corresponding lower position, and they are connected by the three-way material conveying pipe 40 and the material switching valve 60. In this way, the solid discharge of the agitated tank filter 30 can freely fall by gravity, and the transportation method is relatively reliable.

[0074] To facilitate further understanding of the green manufacturing system to which the present invention belongs, the following further describes the specific usage method of the present invention in combination with the following production process:

[0075] 1), Mix NiSO 4 , MnSO 4 , CoSO 4 ternary materials in a set ratio, such as 5:2:3, etc., with pure water in the stirring and mixing device 10 to fully stir and mix 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.

[0076] 2), Pump the ternary material salt solution from the stirring and mixing device 10 into the water washing kettle 20, and at the same time add dilute alkali solution, complexing agent, coating agent and pure water to carry out complexation reaction and aging. At this time, the PH value is controlled at 11±2, the reaction temperature is 60°C and maintained, the reaction time ≤1h, and the particle diameter is controlled at 5μm. 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.

[0077] 3) After aging, the slurry concentration of the ternary material is controlled at 35-50%, the particle diameter distribution is D 50 = 8-12 μm, D 0 ≥ 1 μm; then it enters the stirred tank filter 30, and dry powder is added, and it is slurried and washed with pure water and dilute alkali solution; after washing, the moisture content of the filter cake is <7%, the operation cycle is <2.5 h, the solid content of the mother liquor is <0.1%, and the flatness of the filter cake is less than 10% of the filter cake thickness.

[0078] 4) The filter cake after filtration and washing enters the twin-screw dryer 50 through the solid discharge pipe 35 for drying treatment. At this time, the crystal form retention rate of the ternary material is greater than 96%, and thus a high-quality ternary material product is obtained.

[0079] Practice has proved that after adopting the above design system of the present invention, the single-line production capacity has increased by 6-10 times, from the original 400 kg per batch to 2000-4000 kg, and the production efficiency has been greatly improved; at the same time, 200,000 tons of production wastewater are reduced for every 10,000 tons of production capacity. Among them, the multi-functional integration concept in the process of the present invention organically unifies the slurrying, washing, filtration, pre-drying, and drying sections, has good adaptability to the ternary material, has a large processing capacity, shortens the process flow, shortens the washing time, has less consumption of washing liquid, and generates less production wastewater, obviously meeting the requirements of the current green manufacturing characteristics of increasing efficiency, saving energy, reducing consumption, and reducing emissions.

[0080] The core equipment of the whole process of the present invention, that is, the stirred tank filter 30, its technical parameter of the maximum diameter can be 3600 mm, and the effective filtration area 32a is 10 m 2 . Its locking assembly 37, that is, the automatic opening and closing technology of the hydraulic tooth-engaging type, provides a device basis for the full automation of the filter, and greatly shortens the discharging time and the cylinder opening and closing time. It is estimated that the opening and closing method of the stirred tank filter 30 with a diameter of 3200 mm of the present invention can save more than 50 minutes compared with the traditional integral type and the bolt quick-opening type, as shown in the following table:

[0081] Table 1 Comparison table of filter cylinder connection methods

[0082]

[0083] In summary, the technical features of the device and process of the present invention meet 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, improving production efficiency. The actual power consumption of the core equipment, the stirred tank filter 30, is only 1 / 2 of the rated configured power, greatly reducing power consumption. It is calculated that the energy consumption of the centrifugal equipment in the traditional process is about 5.5 kW·h per 100 kg, while the energy consumption of the stirred tank filter 30 is about 0.8 to 1 kW·h per 100 kg. Calculated based on an annual production capacity of 10,000 tons, the energy consumption can be saved by more than 4.5×105 kW·h. The device and process of the present invention have significant improvements in terms of increasing efficiency, reducing consumption, reducing emissions, as well as automation and simplification of the process flow compared with the existing device and production process for ternary materials, meeting the characteristics of green manufacturing.

Claims

1. A stirred-tank filter for green manufacturing based on ternary materials, characterized in that: It includes a tank body formed by axially mating an upper shell (31) and a lower base (32) with each other. The cavity formed by the cooperation of the upper shell (31) and the lower base (32) constitutes a washing chamber for washing materials. A filtering surface (32a) with a water filtering function is provided at the lower base (32). The filtering surface (32a) divides the washing chamber into a stirring chamber and a water filtering chamber located below the stirring chamber; This filter also includes a spraying assembly (33) for injecting a washing medium and a stirring assembly (34) for performing a stirring operation on the materials in the stirring chamber; A feed pipe and a solid discharge pipe (35) communicating with the stirring chamber are arranged at the upper shell (31), while a water discharge pipe (36) communicating with the water filtering chamber is arranged at the lower base (32); The upper shell (31) and the lower base (32) are locked to each other through a locking assembly (37), so that the tank body has two working states of combination and disassembly: When the tank body is in the combined state, the upper shell (31) and the lower base (32) are locked to each other through the locking assembly (37) to form the tank body; When the tank body is in the disassembled state, the locking assembly (37) is opened, the lower base (32) descends and disengages from the upper shell (31), thereby exposing the filtering surface (32a) located at the lower base (32) and the residual filter cake on the filtering surface (32a); The stirring assembly (34) includes a stirring shaft (34a) arranged coaxially 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 cooperation with a power motor located above the upper shell (31). Stirring blades are provided at the bottom end of the stirring shaft (34a); The stirring blades include a front inclined plate (34b), a rear inclined plate (34c) and a bottom plate (34d) extending radially outward from the stirring shaft (34a). The plate slopes of the front inclined plate (34b) and the rear inclined plate (34c) decrease sequentially 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). The outer ends of the front inclined plate (34b), the rear inclined plate (34c) and the bottom plate (34d) are closed by an end plate (34e), thereby forming a hollow triangular pyramid structure of the stirring blade; There is an included angle between the plate surface of the bottom plate (34d) and the horizontal plane, and each stirring blade is axially symmetrically arranged along the circumference of the stirring shaft (34a); The tip of the included angle between the plate surface of the bottom plate (34d) and the horizontal plane points in the same direction as the rotation direction of the stirring shaft (34a); On the front inclined plate (34b) of the stirring blade facing the stirring direction, there is a plow blade (34f) which is convenient for cutting into and turning over the materials. The plow blade (34f) is in the shape of an arc-shaped tile that gently extends downward and forward from the plate surface of the front inclined plate (34b). Each plow blade (34f) is evenly spaced along the radial direction of the stirring blade on the front inclined plate (34b), and the traveling paths of the plow blades (34f) on each stirring blade are staggered from each other; at the bottom surface of the stirring shaft (34a), there is also an intermediate blade (34g), and the intermediate blade (34g) and the traveling paths of the plow blades (34f) on each stirring blade cooperate to form a complete circle.

2. A stirring tank type filter machine based on the green manufacturing of ternary materials according to claim 1, characterized in that: The locking assembly (37) includes a locking ring (37a) that is coaxially and rotationally fitted along the bottom edge of the upper shell (31). The lower ring surface of the locking ring (37a) extends vertically downward along the axial direction of the upper shell (31), and a biting tooth (37b) is radially and inwardly convex on the lower ring surface of the locking ring (37a); the outer wall of the lower base (32) is in the shape of a two-stage stepped shaft with a thinner upper part and a thicker lower part. A mating tooth (37c) is radially convex on the outer wall of the large-diameter section of the lower base (32), and each mating tooth (37c) is evenly distributed in sequence along the circumferential direction of the lower base (32); in the circumferential direction of the locking ring (37a), the distance between adjacent biting teeth (37b) is greater than the width of the mating tooth (37c), so that the mating tooth (37c) can pass through the gap between the biting teeth (37b) from bottom to top; when the tank body is in the combined state, the bottom stop of the biting tooth (37b) is fitted to the top surface of the mating tooth (37c), so as to tightly press the shoulder of the lower base (32) against the bottom edge of the upper shell (31) in a sealed manner from bottom to top.

3. A stirring tank type filter machine based on the green manufacturing of ternary materials according to claim 2, characterized in that: This filter machine further includes a support assembly for lifting the upper shell (31) off the base surface; the support assembly includes support legs (38a) that are evenly distributed in a circumferential manner around the upper shell (31). Support ear seats (38b) are evenly distributed in a circumferential manner on the outer wall of the upper shell (31) corresponding to the number of the support legs (38a). A fixed connection is formed between the bottom and top ends of each support leg (38a) and the corresponding support ear seat (38b); a piston cylinder end of a hydraulic cylinder (32d) is hinged at the support ear seat (38b), and the piston rod end of the hydraulic cylinder (32d) extends vertically downward and forms a hinged connection with a connecting ear plate (32b) fixed at the lower base (32); there are two or more hydraulic cylinders (32d) and they are evenly distributed in sequence along the circumferential direction of the lower base (32).

4. A stirring tank type filter machine based on the green manufacturing of ternary materials according to claim 3, characterized in that: The locking ring (37a) generates a rotational thrust through a power cylinder arranged at the upper shell (31); a rotation-stopping section (37d) extends vertically upward at the biting tooth (37b), and a mating groove (37e) is recessed at the corresponding mating position of the upper shell (31); when the tank body is in the combined state, the rotation-stopping section (37d) is inserted into the mating groove (37e).

5. A stirring tank type filter based on green manufacturing of 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 thinner at the top and thicker at the bottom. The bottom edge of the upper housing (31) is provided with an outward flange (31a), and a surface fitting rotary mating relationship is formed between the upper surface of the outward flange (31a) and the hole shoulder of the locking ring (37a); The shape of the engaging tooth (37b) is a wedge-shaped block, and the tip of the engaging tooth (37b) points in the locking rotation direction of the lower base (32).

6. A stirring tank type filter based on green manufacturing of ternary materials according to claim 3 or 4 or 5, characterized in that: Moving wheels (32c) are arranged at the lower base (32); A track (39) is laid on the base surface for the moving wheels (32c) to cooperate with when they fall; An anti-deviation guard plate (39a) is arranged outside the track (39) to prevent the moving wheels (32c) from running off track.

7. A stirring tank type filter based on green manufacturing of ternary materials according to claim 1, characterized in that: A transverse partition (34h) is arranged in the cavity of the stirring blade. There is a fitting gap between the front end of the transverse partition (34h) and the end plate (34e), so that the cavity of the stirring blade is divided into an upper heating cavity and a lower heating cavity that are only connected to each other through the fitting 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 respectively connected to the corresponding upper heating cavity and lower heating cavity.

8. A stirring tank type filter based on green manufacturing of ternary materials according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The filter surface (32a) is a metal filter plate or a filter cloth; The inlet of the solid discharge pipe (35) is equal to or higher than the height of the filter surface.

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