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Method for improving particle acceleration performance of air jet mill

An acceleration performance and jet milling technology, which is applied in the field of powder processing, can solve the problems of acceleration of a large number of material particles, and achieve the effects of increasing the collision speed, improving the distribution characteristics, improving the collision probability and crushing efficiency

Active Publication Date: 2017-01-04
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for improving the acceleration performance of jet mill particles. Through the coupling acceleration effect of flow field and electric field, not only can significantly improve the shortcomings that a large number of material particles cannot be accelerated in the core area, but also improve the acceleration performance of material particles. It is of great significance to enhance the crushing strength of the jet mill and reduce the crushing cost

Method used

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  • Method for improving particle acceleration performance of air jet mill

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Effect test

Embodiment 1

[0018] see figure 1 , a method for improving the acceleration performance of jet mill particles, specifically comprising the following steps: the dried industrial solid waste (such as fly ash, sulfur-fixed ash, etc.) is crushed to within 3mm by a coarse crushing system 1, and the coarse The particles are used as the inlet material of the jet mill feed port 2. During the feeding process, the industrial solid waste particles are positively charged by the electrostatic generator 3, and the industrial solid waste particles are directly sent into the supersonic nozzle 4 by mixed flow acceleration. Acceleration, when the material particles enter the acceleration area between the annular iron block at the exit of the nozzle and the impact target 5, they are accelerated under the coupling effect of the drag force of the supersonic flow field and the electric field force until the material collides with the impact target 5 and is crushed , the pulverized material is classified by the c...

Embodiment 2

[0020] see figure 1 , a method for improving the acceleration performance of jet mill particles, which can also be applied to the processing of non-metallic ore, specifically includes the following steps: non-metallic ore (such as mica, gypsum, etc.) The crushed particles are used as the inlet material of the jet mill inlet 2. During the feeding process, the non-metallic ore particles are positively charged by the electrostatic generator 3, and the non-metallic ore particles are directly sent into the supersonic nozzle by mixed flow acceleration. 4, when the material particles enter the acceleration area between the annular iron block at the outlet of the nozzle and the impact target 5, they are accelerated under the coupling effect of the drag force of the supersonic flow field and the electric field force until the material and the impact target 5 Collision crushing is carried out, and the crushed materials are classified by the classifier 6, and the non-metallic mineral pow...

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Abstract

The invention discloses a method for improving the particle acceleration performance of an air jet mill. For the technical problem of how to achieve effective acceleration of particles in the air jet mill, the mode of supersonic flow field and electric field coupled acceleration is adopted to improve the material particle acceleration performance in air jet smashing. The method specifically includes the following steps that 1, materials are coarsely smashed to be 3 mm or smaller; 2, supersonic jet pipes in the air jet mill are manufactured with an insulating material, and outlets of the jet pipes are sleeved with annular iron blocks; 3, the supersonic jet pipes in a smashing cavity of the air jet mill are symmetrically distributed, and an impact target is arranged at the center of the smashing cavity; 4, positive voltage and negative voltage are applied to the annular iron blocks at the outlets of the jet pipes and the impact target respectively. By means of the method, multi-field coupled particle acceleration is achieved, and technical support is provided for further improving the smashing intensity and smashing efficiency of the air jet mill. Through process control of the technology, the material smashing intensity can be improved to 1.5-3 times, the particle size of materials can reach the submicron scale or even the nanometer scale, and the added value of materials can be effectively improved.

Description

technical field [0001] This patent relates to the field of powder processing, in particular to a new method for improving the acceleration performance of material particles. Background technique [0002] Ultrafine powder technology is a new discipline developed in the mid-1970s. Ultrafine powder is used in almost all industries of the national economy. [0003] At present, there are mainly two methods of ultrafine powder processing technology at home and abroad: mechanical crushing (high-speed mechanical impact mill, vertical mill, ball mill, medium stirring mill, vibrating mill, etc.) and airflow crushing (jet mill); mechanical crushing technology It has the characteristics of low cost and large powder output, but it cannot meet the requirements of ultra-fine powder particle size range; jet milling technology has the characteristics of fine powder particle size, narrow particle size distribution and high purity, but there is also the high energy consumption of the product ...

Claims

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Application Information

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IPC IPC(8): B02C19/06
CPCB02C19/06
Inventor 林龙沅陈海焱张明星邱洁刘侹楠
Owner SOUTHWEAT UNIV OF SCI & TECH
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