Particle size classification device

Abstract

The utility model discloses a kind of particle size grading devices, belong to material preparation technical field.The device includes at least one classification unit, the classification unit includes first reservoir, adjustable pressure pump and classifier;The first reservoir is used to accommodate material to be separated, its export is connected with the feed inlet of the classifier by the adjustable pressure pump;The top of the classifier is equipped with overflow outlet, its bottom is equipped with settling zone and valve for controlling discharge.The utility model accurately controls inlet pressure by adjustable pressure pump, in combination with overflow and settling separation of classifier, can realize the efficient, continuous multistage particle size grading of material, especially suitable for battery with four manganese oxide Continuous production process in, solve the problem of unstable product quality and low production efficiency.The utility model structure is simple, convenient to operate, and grading precision is high.

Description

Technical Field

[0001] This utility model belongs to the field of materials preparation technology, specifically relating to a particle size classification device for manganese tetroxide. Background Technology

[0002] In material preparation, it is often necessary to classify process products by particle size to obtain target products of different particle sizes. For example, manganese tetroxide for batteries is a key precursor for the preparation of lithium manganese oxide, and its microstructure is spherical. Conventional production processes often employ intermittent reactions, meaning that after one reaction is completed, the tank needs to be re-opened for subsequent processing. This production method has disadvantages such as discontinuity, low production efficiency, and large fluctuations in product quality.

[0003] To achieve continuous production, it is crucial to solve the problem of online particle classification during the reaction process, so as to promptly separate and collect products that meet the particle size requirements, allowing the substandard particles to continue participating in the reaction. Existing classification equipment, such as hydrocyclones, while having high classification efficiency, suffers from severe wear, easy alteration of particle morphology, high energy consumption, and sensitivity to feed pressure when dealing with spherical, relatively soft manganese tetroxide particles. Traditional single-stage gravity sedimentation classification methods, on the other hand, have shortcomings such as low classification efficiency, inability to operate continuously, and inflexible adjustment of classification accuracy.

[0004] Therefore, there is an urgent need in the field for a particle size classification device that is suitable for soft particles, can operate continuously, has controllable classification accuracy, and has a simple structure. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a particle size classification device to solve the problems of existing classification equipment being unsuitable for continuous production of manganese tetroxide, having uncontrollable classification accuracy, and being inefficient.

[0006] The purpose of this utility model and the solution to its main technical problem are achieved by the following technical solution: This utility model discloses a particle size classification device, comprising at least one classification unit. The classification unit includes a first storage tank, an adjustable pressure pump, and a classifier. The first storage tank is used to contain the material to be separated, and its outlet is connected to the inlet of the classifier via the adjustable pressure pump. The top of the classifier is provided with an overflow outlet for discharging smaller particles; the bottom of the classifier is provided with a settling zone, and a valve is provided at the bottom of the settling zone for discharging larger particles.

[0007] Furthermore, there are multiple grading units, which are connected in series. The overflow outlet of the previous grading unit is connected to the second storage tank corresponding to the next grading unit, thereby realizing multi-level precision grading.

[0008] Furthermore, the valve at the bottom of the settling zone of the previous classifier is connected to the third storage tank via a pipeline to collect the qualified coarse particle product separated in this stage.

[0009] Furthermore, the adjustable pressure pump is a variable frequency pump or a pumping system with a pressure regulating valve. By adjusting the pump power or the valve opening, the pressure and flow rate of the conveyed material are changed, thereby controlling the grading particle size.

[0010] Furthermore, the classifier is a gravity settling classifier, which has a simple structure and is suitable for spherical soft particles.

[0011] Compared with existing technologies, this invention has significant advantages. As can be seen from the above technical solutions: Continuous production: The device can be seamlessly connected to a continuous reactor, enabling continuous feeding and classification of materials, greatly improving production efficiency. Controllable classification accuracy: By adjusting the parameters of the adjustable pressure pump, the feeding conditions and settling velocity of the classifier can be easily changed, thereby flexibly controlling the classification particle size to adapt to different process requirements. Multi-stage classification: Adopting a multi-stage series design, products of different particle size ranges can be separated sequentially, resulting in good classification effect and higher product purity.

[0012] Simple and reliable structure: Based on the principle of gravity sedimentation, it avoids high-speed rotating parts, resulting in less equipment wear. It is particularly suitable for the classification of soft particles such as manganese tetroxide, and has stable operation and low maintenance costs.

[0013] Improving product quality: Timely separation of qualified products avoids over-grinding or excessive reaction, ensuring the uniformity of product particle size and morphology, and improving product quality stability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a schematic diagram of the structure of the classifier of this utility model. Figure 4 This is a cross-sectional view of the classifier of this utility model.

[0015] Markings in the figure 1. First storage tank (raw liquid); 2. Second storage tank (first-stage overflow); 3. Third storage tank (first-stage underflow / coarse material); 4. Adjustable pressure pump; 5. Classifier; 51. Overflow outlet; 52. Settling zone; 53. Valve. Detailed Implementation

[0016] The following detailed description, in conjunction with the accompanying drawings and preferred embodiments, describes the specific implementation methods, structure, features, and effects of this utility model.

[0017] The first-stage classification unit includes a first storage tank 1, an adjustable pressure pump 4, and a first classifier 5. The first storage tank 1 contains manganese tetroxide slurry to be classified. The inlet of the adjustable pressure pump 4 is connected to the bottom of the first storage tank 1 via a pipe, and the outlet is connected to the feed inlet on the upper side of the first classifier 5. The first classifier 5 has an overflow outlet 51 at the top and a conical settling zone 52 at its bottom, with a valve 53 installed at the bottom end of the settling zone 52.

[0018] In operation: Start the adjustable pressure pump 4 to feed the slurry into the middle of the first classifier 5 at a certain pressure. After entering the classifier 5, the fluid velocity decreases, and the particles begin to settle under gravity. Larger particles with faster settling speeds will settle to the bottom settling zone 52. Periodically or continuously open the valve 53 to discharge this portion of coarse particles into the third storage tank 3 for collection. Smaller particles with slower settling speeds will rise with the liquid flow and be discharged from the top overflow outlet 51 into the second storage tank 2.

[0019] To achieve finer classification, the second storage tank 2 can be used as the feed tank for the second-stage classification unit, connected to another adjustable pressure pump 4 and the second classifier 5 (details of the second stage are not shown in the figure, but are indicated by connection). By adjusting the pump pressure of the second stage (usually lower than the pump pressure of the first stage), the overflow (fine particles) of the first stage can be further classified, thereby separating products of different particle size ranges.

[0020] By adjusting the frequency or pressure of the adjustable pressure pump 4, the initial velocity of the slurry entering the classifier can be changed, thereby affecting the settling state of the particles and the classification boundary, and achieving flexible control of the classification accuracy.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A particle size classification device, characterized in that, include: At least one grading unit, the grading unit comprising a first storage tank (1), an adjustable pressure pump (4), and a classifier (5); The outlet of the first storage tank (1) is connected to the inlet of the classifier (5) through the adjustable pressure pump (4); The classifier (5) has an overflow outlet (51) at the top and a settling zone (52) at the bottom, with a valve (53) at the bottom of the settling zone (52).

2. The particle size classification device according to claim 1, characterized in that, The number of hierarchical units is multiple, and the multiple hierarchical units are connected in series sequentially. The overflow outlet (51) of the previous stage classifier (5) is connected to the second storage tank (2) corresponding to the next stage classifier unit.

3. The particle size classification device according to claim 2, characterized in that, The valve (53) at the bottom of the settling zone (52) of the first-stage classifier (5) is connected to the third storage tank (3) via a pipe.

4. The particle size classification device according to claim 1, characterized in that, The adjustable pressure pump (4) is a frequency converter or a pumping system with a pressure regulating valve.

5. The particle size classification device according to claim 1, characterized in that, The classifier (5) is a gravity settling classifier.

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