Showing papers on "Jet mill published in 2006"
TL;DR: It is suggested that beta-succinic acid crystals with plate like morphology are more prone to crystallinity loss on milling compared to the needle like morphology, as the mill type has also been shown to influence the final crystallinity.
104 citations
TL;DR: In this article, a high-pressure wet-type jet mill and a motionless mixer called the Ramond Supermixer were used to generate submicrometer emulsions.
Abstract: Submicrometer emulsions were generated by a high-pressure wet-type jet mill and a motionless mixer called the Ramond Supermixer. Kerosene and liquid paraffin were used as the dispersed phase, aqueous sucrose and poly(ethylene glycol) solutions of PEG 400 to PEG 20000 were used as the continuous phase, and sodium dodecyl sulfate was used as a surfactant. The droplet size distribution, the Sauter mean diameter (d32), and the geometric standard deviation of the droplet size distribution (σg) were investigated under various combinations of the operating variables. The analysis of time-scale parameters contributed to an understanding of droplet deformation and possible re-coalescence. The relationship between the maximum droplet diameter and d32 was determined to be a function of the ratio of the viscosity of the dispersed phase to the viscosity of the continuous phase (K). Empirical correlations were constructed for d32 and σg, and a larger similarity was determined to exist within the correlations, irrespect...
63 citations
TL;DR: Grinding experiments performed with a modified spiral jet mill indicate the strong impact of the elastic-plastic properties of a given substance on its breaking behaviour and new insights into the size reduction process are given.
54 citations
Patent•
30 Jun 2006
TL;DR: In this article, a method of milling a powder comprising introducing a gas stream containing a cryogenic liquid and a drug carrier gas into a jet mill, and milling the powder with the jet mill in one or more passes.
Abstract: A method of milling a powder comprising introducing a gas stream containing a cryogenic liquid and a drug carrier gas into a jet mill, and milling a powder with the jet mill in one or more milling passes. A product produced by the method. A milling apparatus comprising a cryogenic gas input system, a powder feeder, a main jet-mill, and at least one output port for collecting the powder.
46 citations
TL;DR: In this paper, the effects of several process parameters on the comminution capability of high pressure water jet mill were investigated, including pump pressure, mixing tube length and diameter, coal particle mass flow rate, diameter of feed material particle, the standoff distance, loading times, hardness of the target and the impact angle.
28 citations
TL;DR: The paper shows that the mechanical properties of the material as well as the starting particle size dominate the significance of the impact of flaws on fracture behaviour, which tends to increase with increasing flaw density.
9 citations
Patent•
19 Jul 2006
TL;DR: In this article, a modified ultrafine modification method for CaCO3 with dry mechanical force and chemical way comprises: dewatering the fine CaCO 3 powder in drying tank at 100-110 Deg; mixing the CaCO and stearic acid as modifier with mass as 0.5-5.0% of the Ca CO3 evenly; loading the mixed material into the jet mill to obtain the target with high activation rate and light CaCO-2a-m more than 95%.
Abstract: The related ultrafine modification method for CaCO3 with dry mechanical force and chemical way comprises: dewatering the fine CaCO3 powder in drying tank at 100-110Deg; mixing the CaCO3 and stearic acid as modifier with mass as 0.5-5.0% of the CaCO3 evenly; loading the mixed material into the jet mill to obtain the target with high activation rate and light CaCO3-2a–m more than 95%. Wherein, the crystal phase structure of the calcite as main mineral phase produces distortion. This invention supplies a gap both at home and abroad.
8 citations
Patent•
21 Sep 2006
TL;DR: In this article, a method for manufacturing a high density sintered compact with low shrinkage at sintering was proposed, in which a raw material slurry having low viscosity and low thixotropy is prepared by adopting wet jet mill processing without the use of a grinding medium.
Abstract: PROBLEM TO BE SOLVED: To provide a slurry suitable for cast molding, its manufacturing method, a high density powder compact manufactured by using the slurry and a high density sintered compact with low shrinkage. SOLUTION: In the method for manufacturing the slurry by mixing raw material powders and a solvent, a raw material slurry having low viscosity and low thixotropy is prepared by adopting wet jet mill processing without the use of a grinding medium. The homogeneous and high density powder compact is molded by the cast molding of the slurry. A method for manufacturing a high density sintered compact with low shrinkage at sintering by sintering the molded product and the sintered product are provided. The high density sintered compact with low shrinkage has a relative density of 98% or more and a shrinkage factor at sintering of 13% or less. COPYRIGHT: (C)2006,JPO&NCIPI
8 citations
Patent•
28 Jul 2006
TL;DR: In this paper, a method for using a dynamic classifier in a jet mill is described. But the present method is limited to a single classifier and is not suitable for a large number of classes.
Abstract: The present invention relates to a jet mill in which a dynamic classifier is integrated, and to a method for using the same.
7 citations
TL;DR: In this article, the relationship between Vickers hardness, Hv, and the mean particle size after grinding or the grinding throughput rate, Q, was measured and discussed, and it was suggested that the grinding behavior depended on the hard part in the toner sheets.
6 citations
Patent•
28 Dec 2006
TL;DR: In this article, the samarium-iron-nitrogen-based magnet fine powder is pulverized in a jet mill under conditions of a conveying speed of spraying gas and a pulverization time enough to provide fine powder with average particle diameter of 3 μm or less in a single time using inert gas containing 10 vol% or more of helium as conveying and spraying gas.
Abstract: PROBLEM TO BE SOLVED: To effectively obtain high performance magnet fine powder used for a bond magnet of magnet application equipment such as a motor by pulverizing magnet rough powder by jet mill pulverization. SOLUTION: Thus producing method of the samarium-iron-nitrogen-based magnet fine powder contains, as chief ingredients, at least one kind of rare earth elements taking Sm as an essential element; a transition metal element obtained by substituting at least one kind or more of Co, Ti, V, Cr, Mn, Ni, Cu, Zn, Zr, Hf, Nb, Ta, Mo, W, Ga or Al for iron or its part; and nitrogen. In the method, rough powder of the samarium-iron-nitrogen-based magnet fine powder undergoes jet mill pulverization in a jet mill pulverizing apparatus under conditions of a conveying speed of spraying gas and a pulverization time enough to provide fine powder with average particle diameter of 3 μm or less in a single time using inert gas containing 10 vol% or more of helium as conveying and spraying gas. COPYRIGHT: (C)2007,JPO&INPIT
TL;DR: In this paper, the possibility of using a countercurrent jet mill in preparing molding powder to make insulating ceramics is considered and the process scheme is described and technical specifications of products are given.
Abstract: The possibility of using a countercurrent jet mill in preparing molding powder to make insulating ceramics is considered. The process scheme is described and technical specifications of products are given. The auditors draw the conclusion that the stages of diluting clay in water and its milling, homogenization, and drying can be replaced by the stage of fine milling using a countercurrent jet mill.
Patent•
11 Apr 2006
TL;DR: In this article, the authors proposed a method to attain suppression of contamination and improvement of treatment efficiency, to omit or abbreviate classification treatment after pulverizing treatment by lessening particle size dispersion, to suppress wear of mechanical equipment and to attain fine pulverization.
Abstract: PROBLEM TO BE SOLVED: To attain suppression of contamination and improvement of treatment efficiency, to omit or abbreviate classification treatment after pulverizing treatment by lessening particle size dispersion, to suppress wear of mechanical equipment and to attain fine pulverization while generating little heat and giving little influence to quality. SOLUTION: In a jet mill, a material to be pulverized introduced in a crushing chamber 12 of a horizontal disk shape is finely pulverized by a high-speed whirling stream produced by gas jetting from two or more jetting nozzles 20, 21 disposed in a circle shape along a side wall of the crushing chamber. Each jetting nozzle 20, 21 is installed in a state of penetrating a housing forming the crushing chamber and further a top end face 211 of each jetting nozzle 20, 21 is made to be a curved surface shape forming the same circumference surface as an inner wall surface of the crushing chamber. Thereby high-speed whirling stream of a concentric circle shape is stably produced and pulverization of particles of the material to be pulverized is carried out depending on collision between particles. COPYRIGHT: (C)2008,JPO&INPIT
Patent•
28 Jul 2006TL;DR: In this article, the authors describe a milling of silicon granulates to silicon seed particles by using a vertically arranged jet chamber with cylindrical cross-section, jet nozzle (4), two zigzag counter flow-gravity separators (6) directly arranged at the jet chamber, and an inlet for the silicon granulate.
Abstract: The device for producing silicon seed particles, with a size of 50-1000 mu m, has vertically arranged jet chamber (8) with cylindrical cross-section, jet nozzle (4) arranged at the chamber, two zigzag counter flow-gravity separators (6) directly arranged at the jet chamber, and an inlet (6) for the silicon granulates. A grinding gas flow (1) is supplied into the jet chamber (8) via the jet nozzle. The jet chamber has a length of 2-8 sufficient for an expansion of grinding gas flow on the cross section of the jet chamber. The device for producing silicon seed particles with a size of 50-1000 mu m, has vertically arranged jet chamber (8) with cylindrical cross-section, jet nozzle (4) arranged at the chamber, two zigzag counter flow-gravity separators (6) directly arranged at the jet chamber, and an inlet (6) for the silicon granulates. A grinding gas flow (1) is supplied into the jet chamber (8) via the jet nozzle. The jet chamber has a length of 2-8 sufficient for an expansion of grinding gas flow on the cross section of the jet chamber, which has a flow cross-section of 20-30% smaller than the rectangular flow cross-section of the separator. One of the separators has larger rectangular flow cross-section than the other separator. The inlet of the silicon granulates with size of 300-5000 mu m takes place into the separator. A weighing unit is used to determine the weight of silicon particles in the jet chamber and the separator. The weight of silicon particles is regulated via a regulation unit for the dosage of the silicon granulates to obtain an optimal efficiency of the grinding process. An additional gas inlet for visible gas, is present in the inlet area of separator. Parts from an inner metallic covering with a coated inner wall, are contacted with the silicon particles. An inliner is installed into the parts provided with the coating, made of polycrystalline or monocrystalline silicon or quartz. The coating on the inner wall is made of silicon in mono- or polycrystalline form. An independent claim is included for a procedure for milling of silicon granulates to silicon seed particles by using the above device.
TL;DR: In this paper, a high-pressure wet-type jet mill was used to obtain sub-micrometer size emulsions composed of submicrometers of liquid paraffin, aqueous sucrose solution and anionic sodium dodecyl sulfate as emulsifying agent.
Abstract: Emulsions composed of sub-micrometer size droplets were obtained by a high-pressure wet-type jet mill. Liquid paraffin as dispersed phase, aqueous sucrose solution as continuous phase, and anionic sodium dodecyl sulfate as emulsifying agent were used as the model emulsification system. Droplet size distribution, Sauter mean diameter (d 32), geometric standard deviation of the droplet size distribution (σg), and emulsion viscosity (ηe) were investigated under the various combinations of process variables: dispersed phase volume fraction (Φ), dispersed phase viscosity (ηd), continuous phase viscosity (ηc), processing pressure, and number of passages through the wet-type jet mil. d 32 and σg were correlated with the process variables. For the entire experimental range, maximum droplet diameter was varied with d 32 in the range of 1.7–1.9-fold, and a correlation was proposed with K (=ηd/ηc) as a variable. Above a marginal value of d 32, at Φ ≥ 0.1, emulsions exhibited Newtonian behavior and could be ...
TL;DR: In this article, the interaction distance between an alumina colloid probe and sapphire surface is about two times larger in wet jet milled slurry supernatant compared to the just ball milled one.
Abstract: In a recent paper by Omura et al.,1) wet jet milled α-alumina slurries exhibited distinctly different stability behavior compared to ball milled ones in terms of re-flocculation efficiency, rheological properties and packing density. The distinction was attributed to the different behavior of the same NH4 + salt of poly(acrylic acid) in the two milling methods used. Force measurement via colloid probe method in the centrifuged supernatant of the milled slurries confirmed that the interaction distance between an alumina colloid probe and sapphire surface is about two times larger in wet jet milled slurry supernatant compared to the just ball milled one. This result confirmed that processing variables do affect the polyelectrolyte behavior in the slurry. The net force was always repulsive on approach in either supernatants.
Patent•
15 Mar 2006
TL;DR: In this article, the drive shaft of a centrifugal shock-and-jet mill is equipped with additional bumper elements, executed in the form of swirlers, and the additional bumper element is executed by the turbine with blades located in concentric rows.
Abstract: Centrifugal shock-and-jet mill contains housing, in which on the drive shaft the turbine with blades located in concentric rows is mounted, and which, predominantly on the circumference, is equipped with additional bumper elements. The additional bumper elements are executed in the form of swirlers.
Patent•
14 Dec 2006
TL;DR: In this article, an improved jet nozzle was proposed for use in a micronizing jet mill or retrofitting to an existing jet mill, which incorporated a coanda effect inducing element to enhance entrainment of particles to be ground within the vortex created by the micronising jet mill.
Abstract: The current invention provides an improved jet nozzle suitable for use in a micronizing jet mill or retrofitting to an existing jet mill. The improved jet nozzle incorporates a coanda effect inducing element to enhance entrainment of particles to be ground within the vortex created by the micronizing jet mill. When the jet mill uses steam to generate the jet, use of the improved nozzle will reduce energy costs by increasing the efficiency of the jet mill.
Patent•
14 Dec 2006
TL;DR: In this paper, an improved jet nozzle was proposed for use in a micronizing jet mill or retrofitting to an existing jet mill, which incorporated a coanda effect inducing element to enhance entrainment of particles to be ground within the vortex created by the micronising jet mill.
Abstract: The current invention provides an improved jet nozzle suitable for use in a micronizing jet mill or retrofitting to an existing jet mill. The improved jet nozzle incorporates a coanda effect inducing element to enhance entrainment of particles to be ground within the vortex created by the micronizing jet mill. When the jet mill uses steam to generate the jet, use of the improved nozzle will reduce energy costs by increasing the efficiency of the jet mill.
Patent•
12 Oct 2006
TL;DR: In this article, a coarsely-crushed charcoal is extracted from 0.2 mm-2.0 mm in a particle diameter by ultrasonic-cleaning by strong alkaline electric-field water.
Abstract: PROBLEM TO BE SOLVED: To provide a manufacturing method of micronized coals which enables a smooth classification treatment of micronized coals micronized by a crusher. SOLUTION: After bamboo charcoal is crushed into 0.2 mmϕ-2.0 mmϕ in a particle diameter, it is ultrasonic-cleaned by strong alkaline electric-field water. Subsequently, the bamboo charcoal is subjected to a heat sterilization treatment by high-temperature water or steam, and dried to form coarsely crushed charcoal 91. Thereafter, the coarsely crushed charcoal 91 is supplied to a jet mill 4, and at the same time, ions generated by a corona discharge from a discharging device 2 are introduced into a supply route 3 of compressed air fed into the jet mill 4, or a crushing part body 41 of the jet mill 4 to crush the coarsely crushed charcoal 91 to make the micronized coals 92. COPYRIGHT: (C)2007,JPO&INPIT
Journal Article•
TL;DR: In this article, a pilot plant to produce ultra-fine tourmaline powder with jet mill and stirred ball mill is described, and a continuous production process can be realized with particle size less than 100nm.
Abstract: Tourmaline has the characteristics of releasing thermions,far-off infrared radiations and negative ions of oxygen.Ultra-fine powders of tourmaline have extensive applications in the fields of spin and weave,pigment and paint,as well as water purification.The preparation technology of ultra-fine tourmaline powder is discussed.The key equipment of a pilot plant to produce ultra-fine tourmaline powder with jet mill and stirred ball mill is described.Using this pilot plant facility we can produce tourmaline powder with particle size less than 100nm,and a continuous production process can be realized.
Patent•
21 Jul 2006
TL;DR: In this paper, a dynamic sifter with a dimension wheel and a dimension zone is used for the extraction of fine material at the fine material outlet, and an independent claim is also included for the method for grinding.
Abstract: Jet mill has a dynamic sifter (55) containing a dimension wheel (45) and dimension zone (4) which contains separate conveying section (3) and separate coarse material return (6) in grinding area (2). Product entry (1) and fine material outlet (5) are integrated. Grinding material (54) is classified by dynamic sifter and grinding material is introduced in the product entry and afterwards material is ground and is obtained as fine material at the fine material outlet. An independent claim is also included for the method for grinding.
Patent•
15 Jun 2006
TL;DR: In this paper, a media is thrown into the crushing chamber of a dry type air stream type crusher in addition to an object material and it is simultaneously stirred while placing on a ring-like flow air stream.
Abstract: PROBLEM TO BE SOLVED: To make a crushing action by using a jet mill more efficient, to prevent deposition onto an inner surface of a crushing chamber and to realize promotion of rough crushing, intermediate crushing, particularly fine crushing and ultra-fine crushing by using the jet mill. SOLUTION: In the production method for the fine powder, a media is thrown into the crushing chamber of a dry type air stream type crusher in addition to an object material and it is simultaneously stirred while placing on a ring-like flow air stream. The media is made to a material having strong impact-resistance and abrasion-resistance such as a bead made of zirconium oxide or the like and the inner wall surface of the crushing chamber is made to a material having strong impact-resistance and abrasion-resistance and made of zirconium oxide. COPYRIGHT: (C)2006,JPO&NCIPI
Patent•
14 Dec 2006
TL;DR: In this article, an improved jet nozzle was proposed for use in a micronizing jet mill or retrofitting to an existing jet mill, which incorporated a coanda effect inducing element to enhance entrainment of particles to be ground within the vortex created by the micronising jet mill.
Abstract: The current invention provides an improved jet nozzle suitable for use in a micronizing jet mill or retrofitting to an existing jet mill. The improved jet nozzle incorporates a coanda effect inducing element to enhance entrainment of particles to be ground within the vortex created by the micronizing jet mill. When the jet mill uses steam to generate the jet, use of the improved nozzle will reduce energy costs by increasing the efficiency of the jet mill.
Patent•
07 Dec 2006
TL;DR: In this article, the authors proposed a method to provide a carbon fiber made by a vapor phase method, providing excellent conductivity when formed into a composite material with a resin, and providing the composite material having almost no protrusion on the surface.
Abstract: PROBLEM TO BE SOLVED: To provide a carbon fiber made by a vapor phase method, providing excellent conductivity when formed into a composite material with a resin, and providing the composite material having almost no protrusion on the surface. SOLUTION: The carbon fiber made by the vapor phase method, and containing agglomerates having ≥5 μm diameter in an amount regulated so that the proportion of the projected areas of the agglomerates may be ≤5 area% is produced by feeding the aggregated and graphitized carbon fiber of a starting material, made by the vapor phase method to a jet mill so that the contained dust concentration may be 0.1-10 g/m 3 , and driving the jet mill while regulating the number of rotation of the rotor within the range of 7,000-11,000 rpm to collide the agglomerates to each other without adding a shear force or a compression force. COPYRIGHT: (C)2007,JPO&INPIT
Patent•
18 May 2006
TL;DR: In this paper, the process for producing a toner includes a step of pulverizing a crushed product of a composition comprising a resin binder and a colorant with a fluidized-bet jet mill in the presence of fine inorganic oxide particles.
Abstract: PROBLEM TO BE SOLVED: To provide a process by which a small-particle-diameter toner having a sharp particle size distribution can be efficiently prepared SOLUTION: The process for producing a toner includes a step of pulverizing a crushed product of a composition comprising a resin binder and a colorant with a fluidized-bet jet mill in the presence of fine inorganic oxide particles A toner having a volume median particle diameter (D 50 ) of 35-8 μm obtained by the producing process is provided COPYRIGHT: (C)2006,JPO&NCIPI