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Jet mill

About: Jet mill is a research topic. Over the lifetime, 803 publications have been published within this topic receiving 5686 citations.


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Patent
07 Jun 2019
TL;DR: In this article, a jet mill protecting device consisting of a base, the base is of a circular groove cavity structure with an upper opening, universal wheels are arranged at the bottom of the base, first damping parts are uniformly mounted on the bottom wall of the inner cavity of base, a placement plate is arranged above the first dampings parts in a covering mode, circular grooves are uniformly formed in the bottom-wall of the placement plate, the tops of the damping part are arranged in the groove cavity, and arc-shaped stop blocks are uniformly installed on the side
Abstract: The invention discloses a jet mill protecting device in the technical field of health care product processing. The jet mill protecting device comprises a base, the base is of a circular groove cavitystructure with an upper opening, universal wheels are arranged at the bottom of the base, first damping parts are uniformly mounted on the bottom wall of the groove cavity of the base, a placement plate is arranged above the first damping parts in a covering mode, circular grooves are uniformly formed in the bottom wall of the placement plate, the tops of the first damping parts are arranged in the grooves in the bottom wall of the placement plate, and arc-shaped stop blocks are uniformly mounted on the side wall of the top of the inner cavity of the base. According to the device, through thefirst damping parts, acting force in the up-down direction can be damped; meanwhile, combined with the grooves in the bottom wall of the placement plate and balls uniformly installed on the top wall of the groove cavity, acting force in the horizontal direction can be attenuated; and through arc-shaped clamping plates, the jet mill can be clamped, and the stability of the jet mill in the carryingprocess is facilitated.

2 citations

Patent
13 Oct 1998
TL;DR: In this article, the authors proposed a method to produce a mixed inorganic filler with high density in a short time by a simple process by previously mixing two or more kinds of inorganic substances with different particle sizes, pulverizing the mixture with high speed air flow, and then sorting the pulverized mixture.
Abstract: PROBLEM TO BE SOLVED: To produce a mixed inorganic filler with a high density in a short time by a simple process by previously mixing two or more kinds of inorganic substances with different particle sizes, pulverizing the mixture with high speed air flow, and then sorting the pulverized mixture in the case of producing the mixed inorganic filler from two or more kinds of inorganic substances with different particle sizes. SOLUTION: Common fillers such as silica, alumina, zirconia, aluminum hydroxide, etc., are among the inorganic particles to be used. Two or more kinds of such inorganic particles are use. In this case, one of the particle preferably has 0.01-1μm particle size. At the time of mixing these inorganic particles, the particles are previously mixed by using a mixing apparatus in a dry and batch manner and the pre-mixed coarse powder mixture is pulverized by high speed air flow. The apparatus to be used for mixing and pulverizing the powder is preferably a jet mill. After that, in the sorting process, the sorting is carried out by using a centrifugal mixing type sorting apparatus, especially mesh type sorting apparatus, and consequently, a uniform mixture is produced.

2 citations

Journal Article
TL;DR: In this article, the laser particle size analyzer and XRD were used to characterize the particle size, size distribution and phase transition of micron KNO3 powder Morphology and functional groups were characterized by SEM and FT-IR, and moisture absorption was studied by the moisture absorption rate and water contact angle.
Abstract: To obtain highly dispersed micron potassium nitrate( KNO3) powder,KNO3 was firstly ground through jet mill and then was coated by octadecylamine The laser particle size analyzer and XRD were used to characterize the particle size,size distribution and phase transition of micron KNO3 powder Morphology and functional groups of micron KNO3 powder and coated micron KNO3 powder were characterized by SEM and FT-IR,respectively Moisture absorption was studied by the moisture absorption rate and water contact angle( WCA) Thermal decomposition of samples was analyzed by DSC Results show that average size( d50) of micron KNO3 powders is about 2 767 μm,and the crystal form consists with the raw materials With octadecylamine coated KNO3 micron powder presents good dispersibility and the moisture absorption rate is also decreased However,the mass fraction of octadecylamine should be controlled less than 1% to avoid affecting the thermal decomposition of KNO3

2 citations

Patent
22 Jun 2018
TL;DR: In this article, a preparation method of a titanium dioxide supported remediator for continuously-ploughed soil and belongs to the technical field of soil remediators is revealed, where the preparation method comprises the following steps: milling straws to form particles with the particle sizes being smaller than 50mm; then, mixing the particles with nanometer titanium dioxide and titanate, and milling the mixture to form the particles, with the particles sizes of smaller than 1mm.
Abstract: The invention discloses a preparation method of a titanium dioxide supported remediator for continuously-ploughed soil and belongs to the technical field of soil remediator. The preparation method comprises the following steps: milling straws to form particles with the particle sizes being smaller than 50mm; then, mixing the particles with nanometer titanium dioxide and titanate, and milling the mixture to form particles with the particle sizes being smaller than 1mm; next, milling the particles by using a jet mill to form particles with the particle sizes being smaller than 1mu m to obtain the titanium dioxide supported remediator for continuously-ploughed soil, wherein the mass ratio of nanometer titanium dioxide to titanate to the straws is controlled at (2-10):(0.2-1):(89-97.8). The preparation method disclosed by the invention is simple; and the prepared remediator for the soil has a relatively good effect on repairing the continuously-ploughed soil, better utilizes the straws, belongs to an energy-saving and emission-reducing item and has an environmental effect.

2 citations

Proceedings ArticleDOI
01 Jan 2015
TL;DR: In this paper, the authors used a fluidized bed jet mill with three nozzles to extract calcined coal kaolin clay from a 2-3 mm size distribution of the material.
Abstract: The calcined kaolin powder was obtained using a fluidized bed jet mill at the temperatures 17°C and 280°C.The theoretical arithmetic, numerical simulation and experiment were used to compare and discuss the results at the two temperatures. The particle size D50=2.401μm 与 D50=2.003μm of kaolin powder was obtained. The theoretical arithmetic shows that the outlet velocity of the nozzle at the temperature 280°C is higher (38%) than that at the temperature 17°C. The grinding kinetic energy of the jet mill at the temperature 280°Cis twice as that at the temperature 17°C. The numerical simulation of grinding cavity at the temperatures 17°Cand 280°Cshows that nozzle axial velocity is 513m/s at the temperature 17°Cand nozzle axial velocity is 712m/s at the temperature 280°C. Therefore, the grinding particle size at the temperature 280°Cis smaller than that at the temperature 17°C. The yields of calcined kaolin powder and energy consumption of jet mill are obtained through the experiment. The yield of calcined kaolin powder at the temperature 280°Cis higher (14%) than that at the temperature 17°C. The energy consumption of air jet mill at the temperature 280°Cis higher (30%) than that at the temperature 17°C. The results show that the calcined kaolin powder at the temperature 280°Cis beneficial to grinding materials with the smaller particle size and higher yield than that at the temperature 17°C. Otherwise, the energy consumption of jet mill increase from the temperature 17°Cto 280°C. Introduction The kaolin powder has been widely used in the fields of papermaking, ceramics, plastics, coating, etc. [1-7]. In industry applications, the different grades of kaolin powder were classified based on fineness and whiteness. The fineness of kaolin used for the senior painting was lower than 2μm [8]. Recently, the ultrafine kaolin has gradually used in the new materials of refractory castable, 4A zeolite and carbon-white, etc. [9-10]. The prepared kaolin was obtained from mechanical method. The prepared kaolin has the characteristics of fine size and high specific area [11-12]. The Chinese processing technic for grinding kaolin has a distance to the national level [13]. However, the grinding method has obtained a notable progress in China. Ding et al. experiment showed that the 90% particle size of calcined coal kaolin clay was lower than 2 μm using a wet grinding process [14]. Zhang et al. obtained that the mean particle size of calcined kaolin was lower than 4 μm using a mechanical kinetic energy mill [15]. However, the purity of kaolin has a great influence on its application. The Fluidized bed jet mill is suitable for grinding the kaolin. The jet mill has no pollution on the kaolin in the grinding process. The qualified size distribution of the kaolin can be obtained using jet mill [16]. The fluidized bed jet mill uses the compressed air as the grinding energy. The compressed air goes through the supersonic nozzle and into grinding chamber. Then, the compressed air induces the kaolin particles to grind. The gas with the high temperature has a higher dynamic energy than the gas with normal temperature [17]. When the compressed air is heated, the grinding process of kaolin particles are carried at the high temperature. The kaolin particles should have fine particle size using the same classifier and the yield production of kaolin powder increases. International Conference on Material Science and Application (ICMSA 2015) © 2015. The authors Published by Atlantis Press 475 The 2-3 mm size distribution of kaolin was chosen as the raw material in this experiment. The fluidized bed jet mill with three nozzles was used to grind the kaolin at the temperature 17°C and 280°C. The three aspects of theoretical arithmetic, numeric simulation and experiment were used to compare and discuss the kaolin particle size, yields, energy consumption and grinding kinetic energy. This can provide an environment-friendly way that prepares the high quality and high-yield kaolin powder. Experimental Apparatus and Parameters Raw Materials The calcined kaolin was used in this experiment. The kaolin was obtained from the Guizhou. The Moh's hardness was 7-8. The particle size was 2-3 mm. The main chemical components were as follows using the XRF: ω(SiO2)=59.29%, ω(Al2O3)=19.44%, ω(Fe2O3)=14.14%, ω(CeO2)=2.15%, ω(TiO2)=1.98%, ω(K2O)=1.27%. Experimental Apparatus The flow sheet is shown in Fig.1. The main apparatus and parameters: LNJH-60A type fluidized bed jet mill (Designed by Mianyang, Liuneng, Powder Equipment, Co., Ltd.), LNJ-36A type classifier (Power of motor is 4 Kw, Transmission ratio is 1.5:1), Y4-73 type induced fan (Power of motor is 15Kw, The maximum airflow is 1400 m 3 /h), OG-150W type air compressor (Power is 37 Kw). The 27 bags are installed in a filter. The dimensions of bag are φ120×1500mm and the filtration area is 15 m 2 . The filter medium with the surface treatment can resistance to 300°C. Three nozzles are installed in the fluidized bed jet mill. The nozzle diameter is 5.8 mm and the Mach number is 1.98. The particle size of kaolin is measured using a laser particle size analyzer (Beckman Kurt LS13-320 type). Fig.1 Flow sheet Experimental Process The fluidized bed jet mill is used to prepare the kaolin powder in this experiment. The compressed pressure (0.76 MPa) can be obtained using an air compressor. The compressed air goes through the supersonic nozzles and is used to induce the kaolin particles to grind. In order to investigate the grinding process under the different temperatures, the compressed air is heated using a heater. The temperatures of the compressed air are controlled at the 17°C and 280°C. The 2~3 mm raw materials of kaolin go into grinding chamber using a screw feeding machine. The kaolin particles are grinded in the grinding chamber. The total system has a negative condition using an induced fan. The grinded particles go into classification section with the high-speed airflow. The qualified kaolin particles go into the turbo classifier and then are collected in a filter. The coarse kaolin particles are separated from turbo classifier and go into grinding chamber. The coarse kaolin

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202118
202035
201928
201831
201723
201623