Topic
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 Dec 2018
TL;DR: In this article, a preparation method of micro-powder calcium carbonate suitable for polymer production is described, and the method comprises the following steps: coarse crushing and pulverization; pulverisation by a steam jet mill; introduction of steam; and drying in an air flow dryer.
Abstract: The invention discloses a preparation method of micro-powder calcium carbonate suitable for polymer production, and the method comprises the following steps: coarse crushing and pulverization; pulverization by a steam jet mill; introduction of steam; and drying in an air flow dryer to obtain the micro-powder calcium carbonate. The method has high production yield and can greatly improve the compatibility of the micro-powder calcium carbonate with a polymer.
Patent•
27 Nov 2012
TL;DR: In this article, the authors described a safe method of producing a ground fraction of ammonium perchlorate in an air jet and prevent adsorption of moisture from air to obtain ammoniumperchlorate particles with size less than 50 mcm on the level of 93±3%.
Abstract: FIELD: chemistry.SUBSTANCE: invention relates to grinding powdered materials, including explosives, used as charge for rocket engines and can be used in different industries. The method of producing a ground fraction of ammonium perchloroate involves feeding and grinding said ammonium perchlorate, separating into fractions, separating from air and depositing in cyclones. Ammonium perchlorate is fed into a jet mill by a feeding screw with capacity of 300 kg/h. The height of the ammonium perchlorate layer in the hopper over the inlet part of the feeding screw is kept not less than 100 mm. The ammonium perchlorate is fed by an air stream formed by two gas pumps for grinding into a grinding chamber, separated into fractions in a centrifugal classifier with linear rotational speed of 9.1 m/s and deposited in a storage drum. Air is returned into the jet mill for circulation.EFFECT: recommended operating conditions of the jet mill enable to provide a safe method of producing a ground fraction of ammonium perchlorate in an air jet and prevent adsorption of moisture from air to obtain ammonium perchlorate particles with size less than 50 mcm on the level of 93±3%.1 dwg
TL;DR: In this paper, an ultrafine YBCO particle was prepared using a wet jet-mill and the ultrafine particles obtained are homogeneous, suspended in methyl ethyl ketone: CH3COCH2CH3 (MEK).
Patent•
23 May 2019
TL;DR: In this paper, the authors present a method for producing a laminate having a thin resin layer formed from said resin powder. But they do not specify a specific formulation of the laminate.
Abstract: Provided are: a resin powder production method with which it is possible to efficiently produce a resin powder with a narrow particle size distribution; a resin powder capable of forming a thin resin layer in which surface irregularities are suppressed; and a method for producing a laminate having a thin resin layer formed from said resin powder. This resin powder production method comprises: subjecting a material resin body including a hot-melt fluoropolymer having a D50 of 10 [mu]m or greater to primary pulverization by performing a mechanical pulverization treatment at least once until the D50 is from 1 to 300 [mu]m; then performing secondary pulverization with a jet mill; and performing classification if necessary, to obtain a resin powder having a D50 of from 0.01 to 3 [mu]m. The D90 of the obtained resin powder is preferably from 2.5 to 4 [mu]m.
TL;DR: In this article, the results of studying the possibility of fabricating the Pr2Fe14B/α-Fe composite materials by oxidation of the Pr−Fe-B alloy in a fluidized-bed jet mill are presented.
Abstract: The results of studying the possibility of fabricating the Pr2Fe14B/α-Fe composite materials by oxidation of the Pr–Fe–B alloy in a fluidized-bed jet mill are presented. It is shown that the use of the standard powder metallurgy technology supplemented by oxidation of the Pr–Fe–B alloy in a fluidized-bed jet mill for rare-earth magnetically hard materials (MHMs) makes it possible to fabricate Pr2Fe14B/α-Fe composites with high magnetic characteristics. It is established that, when fabricating finely dispersed powders according to the proposed technology in the argon medium containing 0.2 vol % oxygen, residual magnetic induction (Br) occurs with an insignificant drop in the coercive force (jHc). This effect causes a 5% increase in the maximal energy product (BH)max. The almost complete oxidation of the highly praseodymium phase PrxFe occurs with a further increase in the oxygen concentration, which leads to an abrupt drop in the coercive force and, consequently, a decrease in (BH)max. The particles of the α-Fe phase formed due to the oxidation of the magnetic material are formed at the boundaries between the grains of the Pr2Fe14B phase. Herewith, the highest magnetic characteristics are implemented if the α-Fe particles are separated from the grains of the main magnetic phase by thin interlayers of nonmagnetic phases, which makes it possible to hold a high level of jHc for sintered MHM samples. Herewith, the optimal thickness of the α-Fe layers is 0.2–0.3 μm. The α-Fe layers formed with an oxygen content of 0.3 vol % turned out considerably thicker (from 0.8 to 1.1 μm), which leads to an almost 10% decrease in the coercive force of the samples and 3–7% decrease in other magnetic parameters (Br, (BH)max). Thus, when controlling the oxygen content in the working medium of the jet mill, we can vary the thickness of the interlayer of the forming α-Fe phase in the Pr2Fe14B/α-Fe composite material and control its magnetic parameters.