Showing papers on "Jet mill published in 2004"

Improved separation method for highly purified lutein from Chlorella powder using jet mill and flash column chromatography on silica gel

Abstract: We investigated an improved method for the separation of high-purified lutein from a commercially available spray-dried Chlorella powder (CP) using fine grinding by jet mill and flash column chromatography on a silica gel. Saponification and extraction of lutein were enhanced 2.3−2.9-fold in jet mill-treated CP (mean particle size, 20 μm) as compared to untreated CP (mean particle size, 67 μm). The carotenoid extract was dissolved in ether−hexane (1:1 v/v) and subjected to flash column chromatography on silica gel. A mixture of α- and β-carotene was eluted with hexane, followed by elution with hexane−acetone−chloroform (7:2:1 v/v). Lutein (dark-orange band) was collected after the elution of an unknown colorless compound (detected based on UV absorbance). The purity of lutein in this fraction was over 99%, and the yield was 60%. The present study provides key information for obtaining highly purified lutein using flash column chromatography on a silica gel. Keywords: Lutein; Chlorella; jet mill; silica ge...

Product and method for the processing of precursors for lithium phosphate electrode active materials

Abstract: Methods for producing an electrode active material precursor, comprising: a) producing a mixture comprising particles of lithium hydrogen phosphate, having a first average particle size, and a metal hydroxide, having a second average particle size; and b) grinding said mixture in a jet mill for a period of time suitable to produce a generally homogeneous mixture of particles having a third average size smaller than said first average size. The precursor may be used as a starting material for making electrode active materials for use in a battery, comprising lithium, a transition metal, and phosphate or a similar anion.

Nano pearl cream

Abstract: A topical application comprises cultured pearl powder of particle size ranging between 0.4 μm and 1 μm ground by an ultrasonic gas jet mill, and purified water suspending the cultured pearl powder.

Heat treatment method for metal powder

Abstract: PROBLEM TO BE SOLVED: To provide a heat treatment method for obtaining a metal powder superior in dispersibility with a sharp particle size distribution. SOLUTION: This method is characterized by heat-treating the metal powder while pulverizing it at a temperature of 240-800°C with a jet mill. The above metal powder comprises a less noble metal, preferably Ni, and is preferably heat-treated in a neutral or reducing atmosphere. COPYRIGHT: (C)2004,JPO

Investigation of compaction and sintering behavior of SiC powder after ultra-fine treatment.

Abstract: Silicon carbide ceramics were prepared with SiC powder treated by the fluidized bed opposed jet mill as raw materials, and the effects of the ultra-fine treatment mechanism on the compaction and sintering behavior of SiC ceramics were investigated. The results showed that the compacts had higher density and microstructure homogeneity when the sintering temperature of the compact was decreased; and that the surface microstructure, densification and mechanical properties of the sintered body could be ameliorated obviously.

Surface-treated metal nickel powder and production method therefor

Abstract: PROBLEM TO BE SOLVED: To provide a method of producing surface-treated metal nickel powder by which coarse particles are not formed by flocculation even with the lapse of time. SOLUTION: The surface-treated metal nickel powder can be obtained by a method comprising: a surface treatment stage where metal nickel powder is treated with a surface treatment agent selected from polyhydric alcohol, a silane coupling agent and alkanolamine; a heating stage where the surface-treated metal nickel powder is heated at 100 to 300°C; and a stage where the metal nickel powder is pulverized by a jet mill. In a particularly preferable form, e.g., as the heating and pulverization stages for the surface-treated metal nickel powder, pulverization is performed by the jet mill using a jet fluid heated at 100 to 300°C. In an another preferable form, e.g., as the heating stage for the surface-treated metal nickel powder, heating is performed at 100 to 300°C using an electric furnace, and thereafter, as the pulverization stage, pulverization is performed by the jet mill. COPYRIGHT: (C)2004,JPO&NCIPI

Flat type air flow crusher capable of automatic preventing block

Abstract: The utility model discloses an automatically block-proof flat jet mill. A couple of automatically block-proof wall scrapers are located in the working cylinder of the device, to remove the materials adhering to the working cylinder wall timely, which can prevent glutinous materials from blocking the working cylinder, so as to guarantee a continuous crushing process, thereby the production capacity and the product quality of the mill are increased greatly.

Method for producing water-dispersed resin emulsion

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a water-dispersed resin emulsion, which method can disperse a fine resin emulsion of a median diameter of at most 1 μm in water at a relatively low temperature at a good working efficiency without using any organic solvent and without using a large amount of an emulsifier. SOLUTION: The water-dispersed resin emulsion containing the resin emulsion having the median diameter of at most 1 μm and dispersed in water is prepared by subjecting a resin to be emulsified to dry grinding with e.g. a jet mill, dispersing the resultant ground product in water, and subjecting the resultant dispersion together with an emulsifier to wet grinding with e.g. a medium-agitating mill desirably at 50°C or lower. COPYRIGHT: (C)2004,JPO&NCIPI

Method for extracting active components of ginseng by mechanical means

Abstract: The present invention relates to a method of processing ginseng and extracting active components therefrom; more specifically, a method of extracting active components of ginseng by mechanical means of milling and air-classifying dehydrated ginseng via a mill and an air classification system, respectively. The constitution of the present invention includes: a process of placing the dehydrated ginseng into a crude mill and obtaining ginseng granules having 60∼80mesh of fineness; a process of placing thus obtained granules into a single track jet mill to obtain hyperfine ginseng powder with its particles having a size of 1∼100µm; a process of air-classifying thus obtained powder in an air classification system to produce a powder with its particles having a size of 1∼9µm.

Powder processing method, powder processing device and powder manufacturing method

Abstract: PROBLEM TO BE SOLVED: To provide a powder processing method and a powder processing device capable of preventing powder from being adhered to the wall surface of the processing device when the powder is pneumatically transferred. SOLUTION: In the powder processing method and processing device and the powder manufacturing method, the powder such as medicine is pneumatically transferred. The powder processing device 1 such as a jet mill has a heating means 13 positioned along a wall surface 12 against which the powder collides. By the heating means 13, the wall surface 12 is heated to a temperature higher than the vicinity of the softening start temperature of the powder and lower than the melting temperature of the powder. Then the powder is made to pneumatically transfer in the powder processing device 1. COPYRIGHT: (C)2005,JPO&NCIPI

Double odd-bel-like opening nozzle device for fluidization base layer jet mill

Abstract: PROBLEM TO BE SOLVED: To improve the efficiency of a fluidization base layer jet mill and to reduce costs by nozzle design in the jet mill for crushing raw material particles. SOLUTION: A plurality of nozzle devices for releasing the synthetic stream of a high speed fluid into a crushing chamber are set in the side wall of the mill to penetrate the wall. The raw material particles are received by the high speed fluid to be conveyed and introduced into the chamber to be made to collide with each other. Each high-speed stream is released from double-odd-bell-like openings 106 formed in each nozzle device to form the synthetic stream. A large amount of the high-speed fluid moving from the first end to the second end of each opening 106 is converged and accelerated in a convergence region 112, passes through a throat region 114, and is expanded and made a parallel flow linearly in the first expansion region 116 and rotationally in the second expansion region 118. Along the flow, the radius r1 and length s1 of the region 116 are determined to make dr1/ds1 a constant, and the radius r2 and length s2 of the region 118 are determined to make dr2/ds2 a non-linear function of s2. COPYRIGHT: (C)2004,JPO

Powder treatment method, powder treatment device, and powder manufacturing method

Abstract: A powder treatment method and a powder treatment device capable of preventing powder from being adhered to the wall surface of the device when the powder such as medicine is moved on air. The powder treatment device (1) such as a jet mill comprises a heating means (13) along a wall surface (12) on which the powder is impacted. By the heating means (13), the wall surface (12) is heated to a temperature approximately more than the softening start temperature of the powder and lower than the melting temperature of the powder. The powder is moved on air in the powder treatment device (1).

Actualities and Developments of the Elemental Theory of the Super-Fine Jet Mills

Abstract: A review was made of the actualities of the elemental theory of the super-fine jet mills in three aspects, i.e, the accelerating laws of particles in high velocity gas streams, the impacting and grinding laws of particle, and the parameters of jet mills, and some problems that should be studied at present were pointed out.

Jet mill has container divided by cylindrical inner housing into outer annular chamber and central cylinder, and in end section of cylindrical inner housing facing away from air separator injector-form pipes encompass mill gas jets

Abstract: The jet mill has expandable fluid jets directed into a fluidized bed, an air separator installed in the region of the downstream end of the fluidized bed, and a discharge for fine material and mill gas allocated to the discharge. The milling container (1) is divided by a cylindrical inner housing (14) into an outer annular chamber (16) and a central cylinder (15), and in the end section of the cylindrical inner housing facing away from the air separator injector-form pipes encompass the mill gas jets.

Production method of fine powder, and fine powder

Abstract: PROBLEM TO BE SOLVED: To provide a production method of fine powder effectively producing fine powder without forming aggregation in a crushing chamber of a jet mill crushing apparatus and capable of reducing stress applied to crystals of fine particles, and fine powder with a little stress and uniform particle diameters SOLUTION: An inert gas is jetted to coarse powder introduced inside the crush chamber 14a of a crusher 14 from a plurality of jet nozzles 14b at high speed, and the coarse powder is put on a jet stream When the coarse powder is mutually collided to be crushed and finely powdered, elastic blocks 17 are previously filled in the lower part of the crushing chamber 14a The coarse powder is crushed in a state that the coarse powder and the elastic blocks 17 are coexistent COPYRIGHT: (C)2004,JPO&NCIPI

Particle conveying idactus spike nozzle device for fluidized bed jet mill

Abstract: PROBLEM TO BE SOLVED: To improve the efficiency of a mill and to reduce costs by nozzle design. SOLUTION: An idactus spike nozzle device is set on the side of a fluidized bed jet mill. In the nozzle device, the second cylinder part 302 by the second wall 304 is installed in the first cylinder part by the first wall 204. The first hollow part 210 held between the first cylinder part and the second cylinder part 302 is made an annular channel for the first fluid stream 215, and the second hollow part 310 in the second cylinder part 302 is made a channel for the second fluid stream 217. Particles 13e are introduced from a secondary supply pipe 340 into the second hollow part 310. A cowl lip 206, a spike part 312, etc., are installed at a nozzle release end. An aero-spike 224 is produced as an internal throat. A high-speed synthetic stream 220 flows to be collected in a nozzle shaft 311 to expand the width of a jet. The acceptance of particles by the synthetic stream 220 and the probability of conveyance are increased. COPYRIGHT: (C)2004,JPO

Study on Internal Structures and Numerical Simulation of Internal Cavity in a Fluidized Bed Opposed Jet Mill

Abstract: The paper presents the internal structures and performance features of the fluidized bed opposed jet mill based on the jet nozzles structure, impeller types, feeding inlet and bottom structure. Numerical simulation in the cavity of a jet mill whose internal diameter is 200 mm is achieved by the CFD software Fluent to overcome design blindly. The contour maps of static pressure, velocity distribution and path lines for flow-field of jet air in the cavity of the mill are presented by the calculated results. The method can help obtain the optimal design for this kind of jet mill.

Counter jet mill type pulverizing classifier

Abstract: PROBLEM TO BE SOLVED: To provide a counter jet mill type pulverizing classifier which can reduce over-pulverizing and can improve production efficiency SOLUTION: This counter jet mill type pulverizing classifier is constituted by at least providing pulverizing jet nozzles opposing each other, a classification rotor and an inner cylinder in a pulverization chamber COPYRIGHT: (C)2005,JPO&NCIPI

Dispersion of Nanoparticles in Water Using a High Pressure Wet-type Jet Mill

Abstract: ナノメーターサイズの粒子(ナノ粒子)は凝集力が非常に強く, その分散の良否が加工工程あるいは焼結体などの最終製品に大きな影響を与える. したがって, ナノ粒子の分散技術は産業界において重要な要素技術として位置付けられている.本研究では, ナノ粒子の分散が可能である高圧湿式ジェットミルを用いて, SiO2(一次粒子径:約20 nm)およびAl2O3(一次粒子径:約13 nm)を水中へ分散させ平均粒径と操作条件の関係および平均粒径と生成サスペンション粘度の関係を考察した.体積平均径(dv)は両粒子とも処理圧力(P), 通過回数(N)および粒子濃度(C)の増加に伴い減少するが, 一次粒子径までは減少しない. SiO2の場合, 凝集粒子径は一次粒子径の5.9-7.4倍, Al2O3の場合は6.5-8.1倍となり, 一次粒子径が小さいほど分散が難しい. 各種条件において, dvとエネルギー散逸速度(e)は両対数紙上では直線関係を示し, その傾きは−0.03である. 生成サスペンションのレオロジー特性については, 両粒子ともN=0では塑性を示すが, N≧1では擬塑性を示し, Nの増大とともに擬塑性の程度は減少し, N≧10では見かけ上ニュートン性を示す.

Method for producing modified fluororesin powder

Abstract: PROBLEM TO BE SOLVED: To provide a method for efficiently producing modified fluororesin powder ≤25μm in mean particle size. SOLUTION: This method for producing the modified fluororesin powder comprises the step S1 of heating a baked fluororesin to a temperature higher than the melting point of the resin and irradiating the heated resin with ionizing radiation at 1-1,000 kGy in an inert gas ≤2 torr in oxygen concentration to modify the resin, the step S2 of roughly grinding the modified resin with a feather mill, the step S3 of moderately grinding the resultant intermediate particles with a rotary mill, and the step S4 of finely grinding the resultant particles with a jet mill. COPYRIGHT: (C)2004,JPO