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Turbine classifier as well as gradient classifying and purifying system for superfine silica powder

A turbine classifier and silicon dioxide technology, applied in swirl devices, grain processing, etc., can solve the problems of affecting the classification effect, reducing the classification accuracy, unreasonable structural design of the cage blade and guide blade, etc.

Pending Publication Date: 2018-07-13
庞凯 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structural design of the rotor blades and guide blades of the existing turbine classifiers is unreasonable. The rotor blades are straight plates. When the inlet wind speed is constant, the higher the rotation speed of the rotor blades, the smaller the cutting particle size, and the finer particles will be cut. The powder flows out from the fine powder outlet at the upper part of the rotating cage
When the speed is high, the axial vortex of the airflow between the rotor cage blades is strong, which makes the velocity gradient in the flow channel too large, and even the airflow reverse rotation occurs. Rebound, fine powder is difficult to enter the collector through the classification turbine, thereby reducing the classification accuracy; The trend of flow, which will destroy the smooth stability of the classifier, and then affect the classification effect
Therefore, the classification accuracy and dispersion effect of the existing turbo classifier are poor, and it is difficult to obtain high-purity silica ultrafine powder with a gradient distribution of particle fineness

Method used

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  • Turbine classifier as well as gradient classifying and purifying system for superfine silica powder
  • Turbine classifier as well as gradient classifying and purifying system for superfine silica powder
  • Turbine classifier as well as gradient classifying and purifying system for superfine silica powder

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Embodiment 1

[0036] A turbo classifier, such as figure 1 As shown, it includes a spiral volute 1, a rotating cage 2 and a flow guiding mechanism 3 surrounding the rotating cage 2. Both ends of the volute 1 are provided with a first air inlet 11 and a second air inlet 12, and the rotating cage 2 includes several Two rotating cage blades 21 evenly distributed along the circumference of the rotating cage 2, the flow guiding mechanism 3 includes a number of guiding blades 31 evenly distributed around the rotating cage blades 21, and an annular separation channel is formed between the guiding blades 31 and the rotating cage blades 21 . The turbo classifier also includes a material inlet 4, a fine particle outlet 5 and a coarse particle outlet 6, and the coarse particle outlet 6 is in communication with the separation channel. When working, a certain fineness of silica powder enters the turbo classifier, the airflow enters the spiral volute 1 in the tangential direction, enters the annular separa...

Embodiment 2

[0044] A gradient graded purification system of ultrafine silica powder of this embodiment, such as Figure 4 As shown, it includes a ball mill 10, and also includes a multi-stage sorting device for crushing the silica powder output from the ball mill 10 and performing gradient separation step by step according to the particle fineness. The multi-stage sorting device includes two series arranged in series. A stage sorting unit, each stage sorting unit includes a turbo classifier 30 for centrifugally crushing a certain fineness of silica powder and separating coarse and fine particles, and a turbo classifier 30 for separating and collecting The output of the fine particles by the cyclone separator 40. That is, the first-stage sorting unit 201 includes a first-stage turbo classifier 30 and a first-stage cyclone 40, and the second-stage sorting unit 202 includes a second-stage turbo classifier 30 and a second-stage cyclone 40. The structures of all turbo classifiers 30 in this emb...

Embodiment 3

[0060] The main technical scheme of a gradient graded purification system for ultrafine silica powder of this embodiment is the same as that of embodiment 2, except that: Image 6 As shown, the multi-stage sorting device includes a three-stage sorting unit arranged in series, and the silica powder ground by a ball mill is sequentially sorted by the three-stage sorting unit: after being processed by the first-stage sorting unit Obtain first-level coarse particles and first-level fine particles, first-level fine particles are processed by the second-level sorting unit to obtain second-level coarse particles and second-level fine particles, and second-level fine particles are processed by the third-level sorting unit to obtain The third-level coarse particles and the third-level fine particles are high-purity ultrafine silica powder. After the processing of the above three-stage sorting unit, the product with a gradient grade of particle fineness can be accurately obtained. Because...

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Abstract

The invention relates to the technical field of superfine silica powder separation and purification, in particular to a turbine classifier as well as a gradient classifying and purifying system for superfine silica powder. The gradient classifying and purifying system comprises a ball mill and a multi-stage sorting device, wherein the multi-stage sorting device is used for crushing silica powder outputted from the ball mill and carrying out gradient separation on the crushed silica powder stage by stage according to the particle fineness degrees, and comprises sorting units in n stages; and the sorting unit in each stage comprises the turbine classifier and a cyclone separator. The gradient classifying and purifying system provided by the invention has the beneficial effects that through an improvement on the structure of a turbine airflow classifier, the classifying precision and the dispersing effect can be greatly improved; after the silica powder is treated through the sorting units in a plurality of stages, products of which the particle fineness degrees are classified in a gradient manner can be precisely obtained; and then the high-purity superfine silica powder can be obtained.

Description

Technical field [0001] The invention relates to the technical field of separation and purification of ultrafine silica powder, in particular to a turbo classifier and a gradient classification and purification system for ultrafine silica powder. Background technique [0002] Silica powder is also called quartz powder. It has the characteristics of excellent dielectric properties, low thermal expansion coefficient, high thermal conductivity, good high temperature resistance, corrosion resistance, and high hardness. It is a high-quality neutral inorganic filler and is widely used In the plastics, rubber, coatings, electronics, electrical and high-tech products industries, especially in the period of rapid development of the modern electronics industry, semiconductor device packaging materials need to use a large amount of epoxy molding compound, and high-purity silica is ultra-fine Powder is its main filler. With the development of the domestic electronic packaging industry, the d...

Claims

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Application Information

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IPC IPC(8): B02C21/00B02C19/00B02C23/14B02C23/24B04C7/00B04C9/00
CPCB02C19/0012B02C21/00B02C23/14B02C23/24B04C7/00B04C9/00
Inventor 庞凯肖瀚尧
Owner 庞凯
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