Powder size mixing device

Abstract

The utility model relates to a material powder size mixing device which comprises a pretreatment unit, the pretreatment unit comprises a feeding port, a hollow shell and a discharging port which are communicated in sequence, and a first stirring mechanism and a first spray head used for inputting size mixing solvent into the shell are arranged in the shell; the size mixing tank comprises a tank body, a solvent inlet is formed in the tank body, a second stirring mechanism is arranged in the tank body, and the discharge port is communicated with the tank body; and the first spray head is communicated with the slurry mixing tank body through a pump and a conveying pipe. The powder size mixing device disclosed by the utility model is high in size mixing efficiency, and the size mixing time can be effectively shortened while the uniformity of the obtained size is ensured.

Description

Technical Field

[0001] The utility model relates to a material powder slurry mixing device, in particular to a waste battery material powder slurry mixing device, belonging to the field of waste battery recycling and regeneration. Background Art

[0002] In the recycling and regeneration process of waste batteries, drying, pyrolysis, roasting, etc. are important links. Drying and pyrolysis are conventional links for the recovery of waste battery powder or electrode powder, and roasting helps to achieve the subsequent full and efficient extraction and recovery of valuable metals in battery materials. The waste battery powder after the above pretreatment needs further slurrying treatment for subsequent leaching and separation. The usual slurrying-leaching process is to mechanically mix the roasted powder and the slurrying solvent in a slurrying tank, and then add the reaction reagent to carry out the leaching reaction, or transport the adjusted slurry to the leaching tank for mixing with the reaction reagent. During the slurrying process, it is necessary to control the concentration, fluidity (viscosity) and other parameters of the slurry to ensure the uniformity of the slurry to ensure the subsequent leaching effect. The usual slurrying operation is to place a certain amount of powder and slurrying solvent directly in the slurrying tank, or to add a small batch of roasted material to a slurrying tank pre-added with a slurrying solvent. Since the waste battery powder that has been dried, pyrolyzed and / or calcined tends to float above the liquid surface when mixed with the slurry solvent, it is difficult to enter the slurry solvent system (see Figure 8 After the waste battery powder is stirred with water for a period of time, some powder still floats on the upper layer of the slurry), or even if it enters the slurry mixing solvent system, it is difficult to quickly blend with the solvent. In the early stage of mixing, clumps of materials with different degrees of agglomeration are usually formed and exist separately in the solvent, such as a clump with a core of powder and a shell of slurry layer. This leads to the stirring before the slurry mixing is completed, especially the early stirring operation is mostly ineffective stirring operation. Therefore, it usually takes a long time and strong stirring to complete the slurry mixing operation, which seriously affects production efficiency and causes huge energy loss, which is not conducive to large-scale industrial production. At present, there is no slurry mixing method or equipment that can better solve the above problems.

[0003] In addition, the existing slurry mixing system cannot flexibly adjust the slurry mixing process, and there is a risk of slurry mixing failure. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a powder slurry mixing device to solve at least one of the technical problems mentioned in the background technology.

[0005] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0006] A powder slurry mixing device, comprising:

[0007] A pretreatment unit comprising a feed port, a hollow shell and a discharge port which are connected in sequence, wherein a first stirring mechanism and a first nozzle for inputting a slurry-adjusting solvent into the shell are provided in the shell; and

[0008] A slurry mixing tank comprises a tank body, the tank body is provided with a solvent inlet, the tank body is provided with a second stirring mechanism, and the discharge port is connected to the tank body;

[0009] Optionally, the first nozzle is connected to the slurry mixing tank body through a pump and a delivery pipe.

[0010] Thus, the pretreatment unit can premix the material powder with part of the solvent while conveying the material powder, thereby improving the slurry mixing process of the material powder and the solvent; and then evenly mix the premix with the remaining part of the solvent in the slurry mixing tank, which helps to save the time required for mixing and stirring in the slurry mixing tank and improve the slurry mixing efficiency. Furthermore, the first nozzle is connected to the slurry mixing tank body through the pump and the conveying pipe, which can improve the flexibility of the slurry mixing process and ensure the smooth progress of the slurry mixing process.

[0011] Preferably, there are multiple pre-processing units.

[0012] Further preferably, each pretreatment unit is connected to the slurry mixing tank.

[0013] More preferably, the angle of the pre-treatment unit is adjustable.

[0014] As an embodiment of the present invention, the first stirring mechanism includes a stirring shaft extending along the length direction of the shell and a plurality of stirring paddles arranged on the stirring shaft, the plurality of stirring paddles are distributed in sequence along the length direction of the stirring shaft, preferably evenly distributed in sequence, preferably, a roller shaft extending along the length direction of the stirring shaft is provided between two adjacent stirring paddles, the roller shaft is provided with a grinding roller that is gap-matched with the inner wall of the shell, more preferably, the roller shaft is provided with at least 2 grinding rollers.

[0015] As another embodiment of the present invention, the first stirring mechanism includes a stirring shaft extending along the length direction of the shell and a spiral blade arranged on the stirring shaft. Preferably, the spiral blade is provided with a roller shaft extending along the length direction of the stirring shaft, and the roller shaft is provided with a grinding roller that is gap-matched with the inner wall of the shell. More preferably, the roller shaft is provided with at least two grinding rollers, and each grinding roller operates independently, which helps to reduce resistance and save energy consumption.

[0016] As a result, the powder and solvent in the shell are subjected to multi-dimensional mixing and stirring effects such as stirring paddles or spiral blades and grinding rollers, which helps to improve the mixing effect; moreover, the setting of the grinding roller can effectively prevent the premix from sticking to the inner wall of the shell, thereby ensuring the smooth transportation of the pretreatment unit.

[0017] Preferably, there are multiple first nozzles, and they are distributed in sequence along the length direction of the stirring shaft. Thus, the solvent is sprayed at multiple points, which helps to improve the premixing effect and can also better clean the residual powder in the pretreatment unit.

[0018] Furthermore, a partition is provided in the tank body, which divides the inner cavity of the tank body into a slurry mixing area and a clear liquid area. A gap is left between the partition and the top plate of the tank body. The discharge port is connected to the slurry mixing area, and the second stirring mechanism is located in the slurry mixing area; the solvent inlet is connected to the clear liquid area; preferably, the partition is detachably fixed to the tank body. By removing the detachable partition, the final slurry mixing area is the sum of the volumes of the original slurry mixing area and the clear liquid area, which to a certain extent expands the capacity of the slurry mixing area and reserves operating space for individual slurry mixing operations that require additional material addition; at the same time, by controlling the material flow direction of the slurry mixing area and the clear liquid area on both sides of the partition, the flexibility of the slurry mixing process is further improved, ensuring the smooth progress of the slurry mixing operation and a qualified solid-liquid ratio. The inlet of the pump is connected to the clear liquid area, and the outlet of the pump is connected to the first nozzle; preferably, the inlet of the pump is provided with a filtering mechanism, thereby reducing the content of solid matter entering the pump, pipeline and first nozzle when the clear liquid area contains overflow from the slurry area.

[0019] Preferably, a first valve, preferably a flow valve, is provided between the pump and the first nozzle, thereby conveniently adjusting the spraying amount of the first nozzle according to the properties of the powder and the input rate of the powder;

[0020] Preferably, a filter area is provided on the partition plate, and the filter area has a plurality of through holes connecting the slurry mixing area and the clear liquid area. More preferably, the pore size of the through holes is 100-500 μm, and more preferably 150-300 μm. Thus, the slurry mixing process can be flexibly adjusted by changing the overflow direction. For example, during certain slurry mixing operations, there is no longer any fresh solvent injected into the solvent inlet, the clear liquid area stops overflowing into the slurry mixing area, and the pump continues to send the solvent into the pretreatment unit and further into the slurry mixing area, forming an overflow through the filter holes into the clear liquid area, realizing an uninterrupted circulation supply of the pre-slurry spray clear liquid, and ensuring the smooth completion of the entire pre-slurry mixing, slurry mixing and pre-treatment unit residual material washing.

[0021] More preferably, the distance between the filter hole area and the top of the partition is 0-20 cm, more preferably 0-10 cm, and even more preferably 0-5 cm. By setting the height position of the filter hole area, a stable slurry amount and solid content in the slurry mixing area can be guaranteed. Specifically, if too much solvent is added to the pretreatment unit, the solvent inlet liquid inlet, the pumping liquid amount and the filter holes of the partition are coordinated to stop the solvent from overflowing from the clear liquid area into the slurry mixing area. At the same time, by adding a high solid-liquid ratio premix and partially overflowing the solvent from the slurry mixing area to the clear liquid area, the solid-liquid ratio and concentration are increased.

[0022] Furthermore, the discharge port is communicated with the top of the tank body. Preferably, the pretreatment unit is located above the slurry mixing tank.

[0023] Furthermore, a grid is provided in the tank body, the grid is located above the liquid level of the slurry in the tank body, and the communication position between the discharge port and the tank body is located directly above the grid;

[0024] Preferably, the vertical distance between the connection position between the discharge port and the tank body and the grid is 0.5-5m, more preferably 0.8-2m; thereby, when the premix falls onto the grid, it has a certain speed to form a greater impact force, further improving the crushing effect.

[0025] Preferably, the grille is fixedly or detachably connected to the inner wall of the tank; alternatively, the grille is mounted on the rotating shaft of the second stirring mechanism and has a clearance fit with the inner wall of the tank. In this case, during crushing, the premix is not only subjected to the impact of gravity but also to the shear force of the rotating grille, which helps to further enhance the crushing effect.

[0026] Preferably, the grille is a grille mesh or a grille plate;

[0027] Preferably, the top surface of the grille is provided with a plurality of convex points and / or convex strips, the cross-sectional area of the convex points in the horizontal plane direction gradually increases from top to bottom, and the cross-sectional area of the convex strips in the horizontal plane direction gradually increases from top to bottom; or the grille plates are of equal thickness and arranged obliquely, and further are inclined plates of equal thickness; thereby, the convex points and convex strips can play a stronger impact or cutting role during the collision between the premix and the grille, so that large lumps of material are better broken into fine blocks.

[0028] Preferably, a second nozzle is provided within the tank, positioned above the grille. Preferably, the nozzle is retractable and / or rotatable. Preferably, the intersection of the second nozzle's spray direction and the grille is located directly below the connection point between the discharge port and the tank. This prevents material clumps from becoming stuck in the grille's mesh for extended periods, allowing for timely removal of premix from the grille and ensuring optimal crushing.

[0029] Optionally, the grid comprises a plurality of bars arranged parallel to each other, and the distance between adjacent bars is 1-6 cm, preferably 2-4 cm.

[0030] Furthermore, there are multiple pretreatment units; preferably, each pretreatment unit is connected to the slurry mixing tank in parallel; more preferably, the angle of each pretreatment unit is adjustable. This can improve the efficiency of pre-slurry mixing and facilitate the maintenance or cleaning of a specific pretreatment unit without stopping the operation, ensuring the continuous operation of the device. In addition, the material inside can be fully discharged to ensure that the solid-liquid ratio of a single slurry mixing is within a preset range.

[0031] The method for using the slurry mixing device of the utility model may include the following steps:

[0032] S1. Turn on the first stirring mechanism in the pretreatment unit to supply the powder to be slurry-mixed to the feed port of the pretreatment unit. At the same time, spray a portion of the slurry-mixing solvent through the first nozzle provided in the pretreatment unit to obtain a premixed material at the discharge port of the pretreatment unit.

[0033] S2. Turn on the second stirring mechanism provided in the slurry mixing tank, input the premix into the tank body of the slurry mixing tank, and at the same time, input the remaining slurry mixing solvent into the tank body through the solvent inlet provided on the tank body, so that the premix and the remaining solvent are gradually mixed until they are completely mixed to obtain the target slurry.

[0034] Therefore, in the process of conveying the powder to the slurry mixing tank, part of the solvent is sprayed onto the powder in the pretreatment unit through the first nozzle, so that the powder and the part of the solvent are premixed to form a premix whose hydrophilicity has been significantly improved; the premix is then input into the slurry mixing tank, and the remaining part of the solvent required for slurry mixing is input. The surface of the material agglomerate in the premix is often a slurry film with good hydrophilicity formed by the mixture of solvent and powder, so that when this material agglomerate falls to the bottom of the slurry mixing tank in the early stage, it is easy to break and disperse due to gravity impact. After falling into the slurry formed in the early stage in the middle and late stages, it is easy to sink into the slurry due to gravity, and is promptly and effectively broken up by the second stirring mechanism and mixed evenly with the solvent and / or the early slurry. In addition, the amount of slurry in the slurry mixing tank gradually increases, which significantly improves the early mixing efficiency and effective stirring rate. Therefore, at this time, only a short period of stirring is required to more easily mix the premix and the remaining solvent to form a uniform slurry, thereby improving the slurry mixing efficiency and reducing the slurry mixing energy consumption.

[0035] Optionally, in S1, the material powder is uniformly supplied to the pretreatment unit, and the material powder is waste battery material powder, including but not limited to one or more of waste lithium-ion battery powder after or without calcination treatment, waste lithium-ion battery pole piece powder, waste sodium-ion battery powder, and waste sodium-ion battery pole piece powder; in the late stage of premix discharge (usually, the supply of material powder to the pretreatment unit has been stopped at this time, and the premix in the pretreatment unit has been basically discharged), the slurry mixing solvent is transported to the first conveying unit through the first nozzle or the clear liquid obtained by filtering the slurry in the slurry mixing tank is filtered.

[0036] Furthermore, a partition is provided in the tank body, and the partition divides the inner cavity of the tank body into a slurry mixing area and a clear liquid area, and a gap is left between the partition and the top plate of the tank body, the discharge port is connected to the slurry mixing area, and the second stirring mechanism is located in the slurry mixing area; the solvent inlet is connected to the clear liquid area; a pump connected to the clear liquid area is also included, and the outlet of the pump is connected to the first nozzle; in S1, the slurry mixing solvent is added to the clear liquid area through the solvent inlet, and the liquid level of the clear liquid area is controlled to be lower than the height of the partition; in S2, when the premix is formed at the discharge port of the pretreatment unit and enters the slurry mixing tank, the amount of the slurry mixing solvent added at the solvent inlet is adjusted so that the solvent in the clear liquid area forms an overflow part and enters the slurry mixing area; or during the slurry mixing process, Adjust the amount of slurry mixing solvent added to the solvent inlet and / or the amount of liquid sprayed from the first nozzle so that the slurry in the slurry mixing area overflows partially into the clear liquid area; or when the slurry mixing solvent in the clear liquid area has been pumped out, but the powder has not completed the pretreatment operation and the slurry mixing area has not formed an overflow, calculate the amount of slurry required to form an overflow and maintain the spraying cycle, replenish the slurry mixing solvent and a matching amount of powder according to the calculation result, and continue the slurry mixing operation; when the powder is added, use the slurry mixing solvent in the clear liquid area and / or the overflow from the slurry mixing area into the clear liquid area as a washing liquid to flush the residual material in the pretreatment unit; preferably, the partition is detachably fixed in the tank body, and when the washing liquid includes the overflow of the slurry mixing area, the partition is removed after completing S3.

[0037] In this way, the solvent for slurry mixing is fed into the clear liquid zone through the solvent inlet. Part of the solvent can be fed into the pre-treatment unit via a pump connected to the clear liquid zone to participate in pre-slurry mixing. Another part of the solvent can overflow through the partition into the slurry mixing zone. This part of the solvent enters the slurry mixing zone from a high position to a low position, creating a high-level impact on the slurry in the slurry mixing zone, further strengthening the mixing process and helping to further improve the mixing and slurry mixing effect. At the same time, the powder and solvent are actually gradually combined and mixed, that is, the slurry in the slurry mixing zone is gradually increased. Compared with a one-time addition, under the same stirring speed conditions, this can effectively reduce the initial energy consumption and ensure the mixing effect.

[0038] For a slurry mixing system of a certain specification, since the capacity of the slurry mixing tank is relatively fixed, when too much of a slurry mixing raw material is added during the slurry mixing process due to negligence, improper operation or equipment failure, if another raw material that matches the total solid-liquid ratio requirement is added to continue the slurry mixing process, the slurry volume is likely to exceed the upper limit of the slurry mixing tank capacity, making it difficult to continue slurry mixing. If the material is not added, the liquid-solid ratio requirement cannot be met. In either case, the slurry mixing will fail and can only be discarded or require additional processing, affecting the smooth progress of the slurry mixing operation. In addition, if due to various reasons, too much solvent is added in the early stage of the pretreatment unit, the remaining powder will not be treated by liquid spraying and enter the slurry mixing tank in the form of dry powder, reducing slurry mixing efficiency and increasing operating costs.

[0039] In the solution of the present invention, the solvent inlet is connected to the clear liquid zone and a partition is provided. If too much solvent is pumped into the pretreatment unit, it may prevent the subsequent powder from being pretreated, or the addition of the adapted powder may cause the slurry mixing zone to be overfilled. By adjusting the operation, the slurry in the slurry mixing zone can overflow at the partition and flow back to the clear liquid zone. The overflow is then pumped to the pretreatment unit to form an internal liquid phase circulation, ensuring the smooth progress of subsequent pre-slurry mixing. The partition of a certain height is conducive to reducing the solid content of the solvent in the clear liquid zone, improving the smoothness of the slurry circulation and operating efficiency. Preferably, the partition is removably fixed to the tank body. After the powder is added, the slurry is continued to be fed into the pretreatment unit through the pump and the first nozzle to wash away the residual powder remaining in the pretreatment unit. When the washing liquid is overflowing from the slurry mixing zone and / or overflowing from the slurry mixing zone into the clear liquid zone, the removable partition is removed before the slurry mixing is completed, so that all materials in the slurry zone and the clear liquid zone are fully mixed, ensuring the solid-liquid ratio, and at the same time increasing the slurry mixing zone capacity of the slurry mixing tank.

[0040] Furthermore, when the fresh solvent in the clear liquid area has been pumped out, but the powder has not completed the pre-slurrying operation and the slurrying area has not overflowed, the amount of slurry required to form overflow and maintain the spraying cycle and the total capacity of the tank are calculated, and fresh clear liquid and a matching amount of powder are added according to the calculation results to continue the slurrying operation.

[0041] Through the above operations, the slurry adjustment process can be flexibly adjusted to ensure smooth progress of the slurry adjustment process, and the difference between the actual solid-liquid ratio of the finished slurry and the preset value can be minimized, which helps to obtain slurry with a more accurate concentration.

[0042] The above are only limited examples. Those skilled in the art can also refer to the slurry mixing method and device disclosed in this utility model to flexibly deal with other emergencies that may arise in actual operations. Furthermore, S2 also includes the steps of crushing the premix by a grid disposed in the upper portion of the tank body and below the connection between the discharge port and the tank body, and flushing the premix on the grid by a second nozzle located above the grid.

[0043] After premixing, there are inevitably some lumps in the premix. After the premix enters the tank, it is gradually accelerated by gravity and falls on the grid, so that the lumps in the premix are broken or divided by the solid part of the grid into smaller blocks, preparing for further mixing with the solvent to form a uniformly pressurized slurry. After drying, pyrolysis and / or roasting, waste battery powder and other powders are premixed with solvents such as water. Although some of the powders will clump together, they will not form a highly viscous premix. After falling on the grid, they can be further directly broken or divided or the serous membrane on the surface of the clumps can be cracked. The second nozzle above the grid is used to flush the premix on the grid to prevent the clumps from being stuck in the mesh of the grid for a long time. The premix on the grid is flushed down in time, and the liquid flow formed by the second nozzle and the overflow of the clear liquid area can form a certain degree of offset, making it easier to mix the premix with the remaining solvent evenly, and the premix is not easy to stick to the grid or the holes in the grid, which can ensure a good crushing effect and the smooth progress of the slurry mixing work.

[0044] Preferably, the material powder is calcined waste battery material powder, including but not limited to one or more of waste lithium-ion battery powder, waste lithium-ion battery pole piece powder, waste sodium-ion battery powder, and waste sodium-ion battery pole piece powder that have been calcined or not calcined.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] (1) The powder slurry mixing device of the present invention has high slurry mixing efficiency, which can effectively shorten the slurry mixing time while ensuring the uniformity of the obtained slurry.

[0047] (2) The powder slurry mixing device of the present invention has strong applicability and can be applied to roasted powders of different properties. Through the relevant connection and coordination of the partition, pump, first nozzle and other components, the slurry mixing process and parameters can be flexibly adjusted according to the properties of different powders and actual operations, the slurry mixing process and slurry mixing effect can be optimized, and the slurry mixing process can be ensured to proceed smoothly, which helps to further increase production capacity, improve production efficiency, and reduce energy consumption and costs.

[0048] (3) By setting up the grid and the second nozzle, the material agglomerates in the premix can be broken without setting up an additional driving mechanism, so that the agglomerates (such as slurry-coated powder agglomerates) that are easily generated by the premixing of the material powder and the solvent are broken or split, further facilitating the mixing and slurrying operation with the remaining solvent, helping to realize the smooth and efficient execution of each process such as premixing and slurrying, and saving energy consumption.

[0049] (4) The device of the utility model has wide applicability and is not only applicable to the recycling process of waste lithium batteries, but also to the slurry preparation of other powdery materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a simplified structural diagram of the powder slurry mixing device of Example 1 of the present utility model.

[0051] Figure 2 This is a simplified structural diagram of the powder slurry mixing device of Example 4 of the present utility model.

[0052] Figure 3 This is a top view of the slurry mixing tank of Example 4 of the present utility model.

[0053] Figure 4 This is a top view of the grille of Example 4 of the present utility model.

[0054] Figure 5 This is a simplified structural diagram of the partition of Example 4 of the present utility model.

[0055] Figure 6 This is a simplified structural diagram of the powder slurry mixing device of Example 5 of the present utility model.

[0056] Figure 7 This is a partially enlarged view of the first stirring mechanism of Example 5 of the present utility model.

[0057] Figure 8 This is a digital photo of lithium iron phosphate powder calcined at 750°C for 3 hours and stirred with water for 5 minutes. DETAILED DESCRIPTION

[0058] The present invention will be described in detail below with reference to the following embodiments. It should be noted that the embodiments and features of the embodiments may be combined unless they conflict. For ease of description, the words "upper," "lower," "left," and "right" appear below merely to indicate the directions of up, down, left, and right in the accompanying drawings and do not limit the structure.

[0059] Example 1

[0060] See also Figure 1 A powder slurry mixing device is used for slurrying of roasted powder obtained after roasting waste battery powder, comprising a pretreatment unit 1 and a slurry mixing tank 2, wherein the pretreatment unit 1 comprises a feed port 1.2, a hollow shell 1.1 and a discharge port 1.5 connected in sequence, the shell 1.1 is provided with a first stirring mechanism 1.3 and a first nozzle 1.4 for inputting a solvent for slurry mixing into the shell 1.1; the slurry mixing tank 2 comprises a tank body 2.3, the tank body 2.3 is provided with a solvent inlet 2.4 and a slurry outlet 2.7, the tank body 2.3 is provided with a second stirring mechanism 2.1, the discharge port 1.5 is connected to the tank body 2.3, and the slurry outlet 2.7 is located on the bottom side of the tank body 2.3.

[0061] The first stirring mechanism includes a stirring shaft extending along the length direction of the housing 1.1 and a plurality of stirring paddles arranged on the stirring shaft, and the plurality of stirring paddles are uniformly distributed in sequence along the length direction of the stirring shaft.

[0062] There are multiple first nozzles 1.4, which are distributed in sequence along the length direction of the stirring shaft.

[0063] The tank body 2.3 is provided with a partition 2.2, which divides the inner cavity of the tank body 2.3 into adjacent slurry mixing areas 2.5 and clear liquid areas 2.6 on the left and right. A gap is left between the partition 2.2 and the top plate of the tank body 2.3. The discharge port 1.5 is connected to the slurry mixing area, and the second stirring mechanism 2.1 is located in the slurry mixing area. The second stirring mechanism includes a drive motor fixed to the top of the tank body 2.3 and a rotating shaft extending vertically downward into the tank body. The upper end of the rotating shaft is connected to the drive motor, and the lower end of the rotating shaft is rotatably fixed to the bottom of the tank body. The rotating shaft is provided with multiple stirring paddles, which are sequentially distributed along the length of the rotating shaft. The solvent inlet 2.4 is connected to the clear liquid area.

[0064] The device further comprises a pump 1.7 connected to the clear liquid area, the outlet of the pump 1.7 being connected to the first nozzle 1.4; the position where the pump 1.7 is connected to the clear liquid area is lower than the position where the solvent inlet 2.4 is located; a first valve 1.6 (flow valve) is provided between the pump 1.7 and the first nozzle 1.4;

[0065] The discharge port 1.5 is communicated with the top of the tank body 2.3, and the pretreatment unit 1 is located above the slurry mixing tank 2.

[0066] The solvent used for slurry mixing can be introduced into the clear liquid zone through solvent inlet 2.4. The inlet flow rate of solvent inlet 2.4 is controlled so that some solvent overflows through partition 2.2 into slurry mixing zone 2.5. Other solvent is pumped to first nozzle 1.4 and sprayed onto the powder in the pretreatment unit, where it is premixed with the powder. The premix and the remaining solvent are evenly mixed in slurry mixing zone 2.5 by a second stirring mechanism.

[0067] Example 2

[0068] Example 1 was repeated, except that the separator 2.2 was provided with a filter area 2.10 having a plurality of through holes connecting the slurry preparation area and the clear liquid area, each of which had a pore size of 200 μm. The distance between the filter area and the top of the separator was zero.

[0069] Example 3

[0070] Example 1 is repeated, except that: no partition 2.2 is provided in the tank body 2.3, the solvent inlet 2.4 is located at the top of the tank body 2.3, the first nozzle 1.4 is connected in parallel with the tank body 2.3 and the external solvent storage tank through the pump 1.7, a slurry circulation port is opened on the tank body 2.3, the slurry circulation port is connected to the pump 1.7 through a pipeline, and a filter is provided at the slurry circulation port.

[0071] Example 4

[0072] Repeat Example 1, except that: Figures 2 to 5 The tank body 2.3 is provided with a grille 2.8, which is located above the liquid level of the slurry in the tank body 2.3. The connection point between the discharge port 1.5 and the tank body 2.3 is located directly above the grille 2.8. The vertical distance between the connection point between the discharge port 1.5 and the tank body 2.3 and the grille 2.8 is 1.5m. The grille 2.8 is fixed to the inner wall of the tank body 2.3, and the gap between the grille and the rotating shaft of the second stirring mechanism is matched. The grille 2.8 includes a plurality of bars arranged parallel to each other, and the width of the bars and the distance between adjacent bars are 2cm. The top surface of the grille 2.8 is provided with a plurality of protrusions, and the cross-sectional area of the protrusions in the horizontal plane gradually increases from top to bottom. The tank body 2.3 is provided with a second nozzle 2.9, which is located above the grille 2.8. The second nozzle 2.9 is a rotatable and retractable nozzle. The first nozzle and the second nozzle 2.9 are connected to the outlet of the first valve 1.6. A second valve 1.9 (flow valve) is provided between the first valve 1.6 and the second nozzle 2.9.

[0073] Example 5

[0074] Repeat Example 1, except that: Figure 6-7 A roller shaft extending along the length direction of the stirring shaft is provided between two adjacent stirring paddles, and a grinding roller 1.8 is provided on the roller shaft and is clearance-matched with the inner wall of the shell 1.1. Two independent grinding rollers 1.8 are provided on the roller shaft.

[0075] Example 6

[0076] Example 1 was repeated, with the only difference being that the number of pretreatment units was two, and the two pretreatment units were connected to the slurry mixing tank.

[0077] The contents described in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent modifications to the present invention made by those skilled in the art fall within the scope defined by the claims attached to this application.

Claims

1. A powder slurry mixing device, characterized in that: include: A pretreatment unit (1) comprising a feed port (1.2), a hollow shell (1.1), and a discharge port (1.5) connected in sequence, wherein a first stirring mechanism (1.3) and a first nozzle (1.4) for inputting a solvent for slurry adjustment into the shell (1.1) are provided in the shell (1.1); and A slurry mixing tank (2) comprising a tank body (2.3), the tank body (2.3) being provided with a solvent inlet (2.4) and a slurry outlet (2.7), a second stirring mechanism (2.1) being provided in the tank body (2.3), and the discharge port (1.5) being in communication with the tank body (2.3); The first nozzle (1.4) is connected to the tank (2.3) via a pump (1.7).

2. The powder slurry mixing device according to claim 1, characterized in that: There are multiple pretreatment units (1); each pretreatment unit (1) is connected to the slurry mixing tank (2).

3. The powder slurry mixing device according to claim 1, characterized in that: The first stirring mechanism comprises a stirring shaft extending along the length direction of the shell (1.1) and a plurality of stirring paddles arranged on the stirring shaft, wherein the plurality of stirring paddles are distributed in sequence along the length direction of the stirring shaft; or the first stirring mechanism comprises a stirring shaft extending along the length direction of the shell (1.1) and a spiral blade arranged on the stirring shaft.

4. The powder slurry mixing device according to claim 3, characterized in that: A roller shaft extending in the length direction of the stirring shaft is provided between two adjacent stirring paddles, and a grinding roller (1.8) is provided on the roller shaft and is clearance-matched with the inner wall of the shell (1.1); a roller shaft extending in the length direction of the stirring shaft is provided on the spiral blade, and a grinding roller (1.8) is provided on the roller shaft and is clearance-matched with the inner wall of the shell (1.1).

5. The powder slurry mixing device according to claim 3 or 4, characterized in that: There are multiple first nozzles (1.4), which are distributed in sequence along the length direction of the stirring shaft.

6. The powder slurry mixing device according to any one of claims 1 to 4, characterized in that: A partition (2.2) is provided in the tank body (2.3), the partition (2.2) dividing the inner cavity of the tank body (2.3) into a slurry mixing area and a clear liquid area, a gap being left between the partition (2.2) and the top plate of the tank body (2.3), the discharge port (1.5) being connected to the slurry mixing area, the second stirring mechanism (2.1) being located in the slurry mixing area; the solvent inlet (2.4) being connected to the clear liquid area; The inlet of the pump (1.7) is connected to the clear liquid area, and the outlet of the pump (1.7) is connected to the first nozzle (1.4).

7. The powder slurry mixing device according to any one of claims 1 to 4, characterized in that: The discharge port (1.5) is in communication with the top of the tank body (2.3), and the pretreatment unit (1) is located above the slurry mixing tank (2).

8. The powder slurry mixing device according to claim 1, characterized in that: A grid (2.8) is provided in the tank body (2.3), the grid (2.8) is located above the liquid level of the slurry in the tank body (2.3), and the communication position between the discharge port (1.5) and the tank body (2.3) is located directly above the grid (2.8); The vertical distance between the connection position between the discharge port (1.5) and the tank body (2.3) and the grid (2.8) is 0.5-5m; The grille (2.8) is fixedly connected or detachably connected to the inner wall of the tank body (2.3); or, the grille (2.8) is arranged on the rotating shaft of the second stirring mechanism (2.1) and is clearance-matched with the inner wall of the tank body (2.3); The grille (2.8) is a grille mesh or a grille plate.

9. The powder slurry mixing device according to claim 8, characterized in that: The top surface of the grille (2.8) is provided with a plurality of convex points and / or convex strips, the cross-sectional area of the convex points in the horizontal direction gradually increases from top to bottom, and the cross-sectional area of the convex strips in the horizontal direction gradually increases from top to bottom; or, the grille plate is an inclined plate of equal thickness.

10. The powder slurry mixing device according to claim 8, characterized in that: A second nozzle (2.9) is provided in the tank body (2.3), and the second nozzle (2.9) is located above the grille (2.8).

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