Showing papers on "Jet mill published in 2013"
TL;DR: In this article, the authors used isothermal calorimetry to evaluate the effect of the size and shape of the particles obtained from the jet mill grinding process on the extent and rate of hydration as well as their effect on the compressive strength of mortars.
Abstract: While the majority of commercial ordinary portland cement (OPC) is ground using a ball mill or a vertical roller mill, other industries have shown that jet mill grinding can be an alternative approach for grinding materials. This paper investigates the potential application of jet mill grinding for two systems. The first system is a blend of OPC and 15% limestone, and the second system is a blend of OPC and 40% fly ash. It was observed that when jet mill grinding is used, the average particle size of the powders is decreased to approximately 4 μm or less with a narrower particle size distribution than that achieved using ball milling. In addition to evaluating the size and shape of the particles obtained from the jet mill grinding process, this paper focuses on evaluating, using isothermal calorimetry, the effect these changes in particle size and distribution have on the extent and rate of hydration as well as their effect on the compressive strength of cement pastes or mortars. This study also investigated differences between inter-grinding and blending separately ground materials to form an OPC/limestone mixture. Both inter-ground and separately ground OPC/limestone mortars demonstrated an accelerated hydration at early ages accompanied by an increase in early age strength. This appears to be primarily due to the increased surface area of the finer particles that provides more available surface for the hydration reaction. The inter-grinding appeared to be more effective than grinding the materials separately because an improved graded particle size distribution was obtained. The inter-ground OPC/limestone mixture shows accelerated initial hydration at water to powder ratios (w/p, where powder = cement + limestone) of 0.50 and 0.35 when compared with the samples before grinding. At the lower w/p of 0.35, the OPC/limestone mixture appears much more efficient. In the OPC/fly ash mixture, jet mill grinding also accelerates the rate of hydration and strength development.
50 citations
TL;DR: In this article, experiments to define the cut size of particles were conducted and an extensive numerical investigation led to usable equations that take into account not only all of the above parameters but also the chamber mill diameter, the grinding chamber height, the classifier height and the outlet diameter and the number of nozzles.
33 citations
Patent•
24 Jul 2013
TL;DR: In this article, a manufacturing method of high performance NdFeB rare earth permanent magnetic material was described, which was based on control over technological parameters of alloy smelting, coarse crushing, jet milling powder and forming and through addition of nanoscale oxide micro powder.
Abstract: The invention discloses a manufacturing method of high-performance NdFeB rare earth permanent magnetic material. Through control over technological parameters of alloy smelting, coarse crushing, jet milling powder and forming and through addition of nanoscale oxide micro powder, granularity of jet milling powder is refined, refined powder collected in a filter of a jet mill and powder of a cyclone collector are mixed, and therefore utilization ratios of the material and performance of a magnet are improved greatly; and the usage amount of rare earth is reduced greatly, especially the usage amount of heavy rear earth, and rear resources are protected.
27 citations
Patent•
11 Dec 2013
TL;DR: In this article, a preparation method of high-purity micro-fine low-oxygen titanium powder is presented, which is characterized by combining hydrogenation and dehydrogenation with a jet milling process, firstly carrying out hydrogenation treatment on a titanium sponge to prepare titanium hydride powder, then utilizing a jet-mill to break the titanium hyddride, and finally utilizing the jet mill to carry out breaking gradation and vacuum package and obtaining a titanium powder product.
Abstract: The invention provides a preparation method of high-purity micro-fine low-oxygen titanium powder, which belongs to the technical field of powder preparation in the powder metallurgy process. The preparation method is characterized by combining hydrogenation and dehydrogenation with a jet milling process, firstly carrying out hydrogenation treatment on a titanium sponge to prepare titanium hydride powder, then utilizing a jet mill to break the titanium hydride, then carrying out vacuum dehydrogenation, and finally utilizing the jet mill to carry out breaking gradation and vacuum package and obtaining a titanium powder product. Compared with the traditional ball milling process, the jet milling process causes no pollution, and iron impurities caused by collision of steel balls in the ball milling process can be avoided; due to jet milling and high-vacuum dehydrogenation treatment, the content of oxygen can be controlled to be lowest, and the powder taking and packaging operations are respectively carried out in a glove box, so that the powder and the air are isolated in the whole process, and further, the prepared high-purity micro-fine low-oxygen titanium powder is prepared.
16 citations
TL;DR: The continuous cogrinding approach is a promising technique to prepare the drug in a rapidly dissolving, yet crystalline, form to enhance the drug dissolution rate.
15 citations
TL;DR: The inclusion of a drying process following the micronization step allowed for the decomposition mechanism to be successfully controlled in the subsequent storage of the jet mill-micronized KW-2581 drug substance.
12 citations
Patent•
29 Sep 2013
TL;DR: In this paper, a method for producing neodymium-iron-boron rare earth permanent magnetic materials comprises: controlling technological parameters of alloy smelting, coarsely pulverization, milling by jet mill, and compaction; and adding nano-sized micro powder of oxide, in such a manner that a particle size of milling was decreased, and fine powder collected by the powder filter and powder collection by a cyclone collector are mixed.
Abstract: A method for producing neodymium-iron-boron rare earth permanent magnetic materials comprises: controlling technological parameters of alloy smelting, coarsely pulverization, milling by jet mill, and compaction; and adding nano-sized micro powder of oxide, in such a manner that a particle size of milling by the jet mill is decreased, and fine powder collected by the powder filter and powder collected by a cyclone collector are mixed. Utilization rate of the materials and performance of magnets are significantly improved. Usage amount of rare earth is significantly saved, especially usage amount of heavy rare earth. Thus, the scarce resources are protected.
10 citations
Patent•
16 Apr 2013
TL;DR: In this paper, the authors present an approach for the micronization of a powdered material (P) containing particles, comprising of a container containing a reserve of the powdered product (P), to be micronized; a high-energy gaseous spiral fluid-jet micronising mill with which powdered product is micronised; and a feed system (13) to feed powdered product from container to the spiral jet mill (12), wherein feed system comprises a special microdispenser device (20, 21, 26, 27, 28 and 29) that mic
Abstract: Apparatus (10) for the micronisation of a powdered material (P) containing particles, comprising: a container (11), containing a reserve of the powdered product (P) to be micronised; a high-energy gaseous spiral fluid-jet micronising mill (12) with which powdered product (P) is micronised; and a feed system (13) to feed powdered product (P) from container (11) to the spiral jet mill (12), wherein feed system (13) comprises a special microdispenser device (20, 21, 26, 27, 28, 29) that micrometrically dispenses and directly feeds the powdered material (P), in a dense state, to the spiral jet mill (12), and wherein said microdispenser device (20) comprises one or more dispensing sections (21) which are cyclically filled with material originating from container (11) and then emptied to feed the material to the spiral jet mill (12), opening and closing at high frequency a plurality of control valves (26, 27, 28 and 29) associated with the dispensing sections (21) of the microdispenser device (20).
7 citations
Patent•
20 Feb 2013
TL;DR: In this article, an opposed jet mill sorter with a modification function and a mill sorting system is presented, which can be simultaneously performed during the material milling process and power consumption during the mill process can be reduced.
Abstract: The present invention provides an opposed jet mill sorter having a modification function and a mill sorting system. The jet mill sorter comprises a cavity, a material outlet arranged on the top of the cavity, and a sorting part arranged on the bottom of the f the cavity, wherein the cavity is provided with at least a pair of material feeding nozzles, the material feeding nozzles are oppositely arranged on side walls of the cavity, the bottom of the sorting part is provided with a residue discharging port, the outer wall of the sorting part is provided with a gas inlet, and an air distribution plate is arranged between the cavity and the sorting part. With the present invention, modification can be simultaneously performed during the material milling process, the difficultly milled material can be timely eliminated, and power consumption during the mill process can be reduced.
6 citations
Patent•
25 Dec 2013
TL;DR: In this article, a fluidized bed jet mill for biological pesticide production is described, where the milling fineness of materials can be controlled by adjusting the revolving speed of a classification wheel and the application range of classification is wide.
Abstract: The utility model discloses a fluidized bed jet mill for biological pesticide production. The fluidized bed jet mill comprises a base frame, wherein a milling cylinder is installed on the base frame, and a milling chamber is formed in the milling cylinder; a feeding device is arranged on one side of the lower end of the milling cylinder, and a high-speed air stream jet device is installed at the bottom of the milling cylinder; the upper end of the milling cylinder is sealed and connected with a classification case, and a discharge port is formed in one side of the classification case; and a classification chamber is formed in the classification case, and a material classification device is installed in the classification chamber. With the adoption of the scheme, due to mutual impacts and collisions among particles with main milling functions, the high-speed particles and the inner wall of the milling cylinder seldom collide, and the abrasion is reduced; and the milling fineness of materials can be controlled by adjusting the revolving speed of a classification wheel, and the application range of classification is wide.
6 citations
Patent•
09 Oct 2013
TL;DR: In this paper, the degree of alignment of the magnet can be improved by preparing the pre-sintered alloy material, the particle size of the powder ground by the jet mill can be refined and the fine powder in the filter of the jet filter can be mixed with the powder collected by the cyclone collector.
Abstract: In the method for producing a high-performance neodymium-iron-boron rare earth permanent magnetic material of the present invention, the degree of alignment of the magnet can be improved by preparing the pre-sintered alloy material, the particle size of the powder ground by the jet mill can be refined and the fine powder in the filter of the jet mill can be mixed with the powder collected by the cyclone collector by controlling the oxygen content of the jet mill and adding the nanoscale oxide fine powder. The present invention can significantly improve the utilization ratio of the material and the performance of the magnet, save the use of the rare earth, and especially the heavy rare earth, thereby protecting the scare resources.
TL;DR: In this paper, a matrix model of the classification process in a centrifugal air flow classifier with a fluidized bed is presented using matrix model to determine the cut size of a coarse product.
Abstract: The cut size determination on the basis of proposed matrix model of classification process in a centrifugal air flow classifier with a fluidized bed is presented using matrix model. The presented methodology of cut size determination is based on the precise measurement of the total mass of fed material and coarse product in experimental tests. Knowledge of the feed particle size distribution is also required. Considered classifier is a part of the fluidized bed jet mill. The presented cut size determination will allow to optimize mill work and prediction of particle size distribution of the classification products.
Patent•
10 Jul 2013
TL;DR: An improved jet mill for a fluidized bed comprises a rack, a grinding cavity connected on the rack, and a grading cavity arranged at the upper part of the grinding cavity and communicated with the ground plane as discussed by the authors.
Abstract: An improved jet mill for a fluidized bed comprises a rack, a grinding cavity connected on the rack, and a grading cavity arranged at the upper part of the grinding cavity and communicated with the grinding cavity, wherein a grading impeller driven by a driving device is arranged in the grading cavity; and the improved jet mill is characterized in that a secondary air inlet is arranged on the grinding cavity According to the improved jet mill for the fluidized bed, the structure design of the grinding cavity is improved on the basis of the existing jet mill for the fluidized bed, so that the finished products in the grinding cavity can be fully extracted, over grinding phenomenon of the material in the grinding cavity is avoided, and the output is improved by about 25%
Patent•
27 Mar 2013
TL;DR: In this article, an organic surface treatment method for improving water dispersion stability of rutile titanium dioxide is described, which is characterized by comprising the step of: carrying out surface modification treatment on titanium dioxide by using one or more organosilicon material compounds to act on Titanium dioxide particles through a crushing equipment of a wet process (taking deionized water as a diluent, and mixing organosailicon materials with titanium dioxide) and a dry method (utilizing a Raymond mill or a jet mill).
Abstract: The invention discloses an organic surface treatment method for improving water dispersion stability of rutile titanium dioxide. The method is characterized by comprising the step of: carrying out surface modification treatment on titanium dioxide by using one or more organosilicon material compounds to act on titanium dioxide particles through a crushing equipment of a wet process (taking deionized water as a diluent, and mixing organosilicon materials with titanium dioxide) and a dry method (utilizing a Raymond mill or a jet mill). The dispersion stability of titanium dioxide in a waterborne system can be obviously improved, and meanwhile, titanium dioxide has low foaming characteristics and high-temperature resistance. The method has the advantages of being simple in operation, convenient to prepare, mild in reaction condition, free of environmental pollution, and low in cost.
01 Jan 2013
TL;DR: In this article, a matrix model of the classification process in a centrifugal air flow classifier with a fluidized bed is presented using matrix model to determine the cut size of a coarse product.
Abstract: The cut size determination on the basis of proposed matrix model of classification process in a centrifugal air flow classifier with a fluidized bed is presented using matrix model. The presented methodology of cut size determination is based on the precise measurement of the total mass of fed material and coarse product in experimental tests. Knowledge of the feed particle size distribution is also required. Considered classifier is a part of the fluidized bed jet mill. The presented cut size determination will allow to optimize mill work and prediction of particle size distribution of the classification products.
Patent•
07 Aug 2013
TL;DR: In this article, a high energy nanometer impact mill was used to combine low temperature puffing treatment on selected coal particles under gas protection, and then a ball mill and a jet mill were used to crush the coal particles.
Abstract: The present invention provides a production process for preparing nanometer coal powder by using puffing and mechanical crushing. The production process comprises: carrying out a low temperature puffing treatment on selected coal particles under gas protection, crushing through a ball mill, carrying out jet mill crushing while carrying out chemical treatments such as alkali washing, acid washing, water washing and solvent extraction on the coal particles, and finally adopting a high energy nanometer impact mill to prepare the required coal nanometer particles. Compared with the production process in the prior art, the production process of the present invention has the following characteristics that: puffing and mechanical crushing are combined during the nanometer coal powder production process while the coal particle chemical treatments are performed during crushing, such that the prepared coal particles are fine, energy consumption during the production process is reduced, and the prepared nanometer coal powder has wide uses, can be used for compounding a novel fuel base material, can be separately adopted as a fuel or a fuel additive, can be adopted to replace carbon black products, and can further be separately adopted as a chemical industry intermediate.
Patent•
17 Sep 2013
TL;DR: In this article, a filler composition consisting of an inorganic fiber composed of an organic material and spherical silica particles of a volume average particle size of 0.01-5 μm is proposed.
Abstract: PROBLEM TO BE SOLVED: To provide a resin composition containing an inorganic fiber excellent in fluid flow characteristics as a filler.SOLUTION: A filler composition comprises an inorganic fiber composed of an inorganic material and spherical silica particles of a volume average particle size of 0.01-5 μm. The presence of the spherical silica particles not only allows easy dispersion of an inorganic fiber in a resin composition but improves handleability of the filler composition itself. The viscosity reduction effect is improved further by carrying out a cracking step of cracking raw silica particles having a volume average particle size of primary particles of 200 nm or smaller to a bulk density of 450 g/L or lower with a jet mill and adding the microparticle material obtained by the cracking step to the filler composition.
Patent•
21 Aug 2013
TL;DR: In this article, an organic surface modification method for preparing ultra-disperse rutile titanium dioxide is described, which is characterized by using one or more organosilicon materials and by adopting a wet method with deionized water as a diluent.
Abstract: The invention relates to an organic surface modification method for preparing ultra-disperse rutile titanium dioxide. The organic surface modification method is characterized in that the rutile titanium dioxide is subjected to surface modification treatment by using one or more organosilicon materials and by adopting a wet method (with deionized water as a diluent, the organosilicon material is mixed with the titanium dioxide) and a dry method (crushing equipment, such as Raymond mill or jet mill is used for acting on titanium dioxide particles). The oil dispersibility and water dispersibility of the titanium dioxide can be simultaneously improved. The organic surface modification method has the advantages of mild reaction conditions, no environment pollution and low cost and is simple to operate and convenient to prepare.
Patent•
12 Jun 2013
TL;DR: In this paper, a charging auxiliary device for a neodymium ion boron jet mill is described, in which a spiral feeding mode is adopted, compared with a vibration feeding mode, blanking is more uniform, the weight of a mill chamber is steadier, and the grain size distribution of milled powder was more uniform.
Abstract: The utility model relates to a charging auxiliary device for a neodymium ion boron jet mill. The charging auxiliary device for the neodymium ion boron jet mill comprises an electric machine (1), a first coupler (2), a reducer (3), a second coupler (4), a support base (5), a spiral head (6), a pipeline (7) and a charging hopper (8), wherein the electric machine (1), the first coupler (2), the reducer (3), the second coupler (4), the support base (5) and the spiral head (6) are connected in series sequentially, the pipeline (7) is arranged on the periphery of the spiral head (6), and the pipeline (7) is connected with a discharge hole of the discharge hopper (8). According to the charging auxiliary device for the neodymium ion boron jet mill, a spiral feeding mode is adopted, compared with a vibration feeding mode, blanking is more uniform, the weight of a mill chamber is steadier, and the grain size distribution of milled powder is more uniform.
Patent•
13 Nov 2013
TL;DR: In this article, an efficient energy-saving jet mill is provided with a bearing dustproof structure to guarantee a safe use environment for a bearing, and the material level is controlled in a weighing mode, the error range is reduced.
Abstract: The utility model discloses an efficient energy-saving jet mill. A rotation shaft of a classification wheel is fixed through two supporting points, a dustproof structure is arranged at a material discharging side of the classification wheel, and a direct and non-turning material discharging structure is adopted, the rotation speed of the classification wheel is largely improved, the efficient energy-saving jet mill is applicable to high-accuracy classification, and an energy-saving dustproof effect is achieved for the classification wheel. The efficient energy-saving jet mill is further provided with a bearing dustproof structure to guarantee a safe use environment for a bearing. The framework of the classification wheel is composed of a front impeller disc, a rear impeller disc, a middle impeller disc and a connecting sleeve barrel, so that the rigidity of the classification wheel is improved. Vanes of the classification wheel comprise main vanes and auxiliary vanes, can eliminate eddies and lower wind resistance. An air inlet pipe of a spraying nozzle is bent towards the direction near a cavity of the jet mill and then is connected with the spraying nozzle, so that the structure is compact. The material level is controlled in a weighing mode, the error range is reduced. The section of the bottom of the cavity of the jet mill is arc, so that residual amount and occupied space of materials are reduced.
Patent•
[...]
02 Apr 2013
TL;DR: In this paper, the authors proposed a jet mill for reducing a variation in a particulate diameter by crushing treatment by stably generating a high speed swirling flow in a cavity chamber, though being an extremely simple structure.
Abstract: PROBLEM TO BE SOLVED: To provide a jet mill apparatus capable of reducing a variation in a particulate diameter by crushing treatment by stably generating a high speed swirling flow in a cavity chamber, though being an extremely simple structure.SOLUTION: The jet mill apparatus comprises a plurality of jet nozzles 13 embedded in a ring shape in an inner wall side surface of the cavity chamber 11, and crushes a crushing object injected into the cavity chamber in a fine particle by using the high speed swirling flow generated by high pressure gas jetted from the nozzles. A concentric coaxial cylinder of turning in the vertical upper direction is provided in a substantially central part of a ceiling surface of the cavity chamber, and the crushing object is injected into the cavity chamber by using negative pressure generated in an inner cylinder part 21 of the coaxial cylinder 21, and the crushed fine particle is also extracted from the inside of the cavity chamber by using positive pressure generated in an outer cylinder part 22 of the coaxial cylinder.
Patent•
08 May 2013
TL;DR: In this article, an organic surface modification method for improving the hydrophobicity and temperature resistance of calcium carbonate for plastics is described. But the method has the advantages of mild reaction condition, no environmental pollution and low cost, and is simple to operate and convenient to prepare.
Abstract: The invention provides an organic surface modification method for improving the hydrophobicity and temperature resistance of calcium carbonate for plastics. The method is characterized in that one or more organic silicon material compounds are used to act on calcium carbonate particles to modify the surface of the calcium carbonate by a wet method in which the organic silicon material and the calcium carbonate are mixed with deionized water as a diluting agent and a dry method which utilizes ball mill, Raymond mill or fluid jet mill and other crushing equipment. Thus, the hydrophobicity and temperature resistance of calcium carbonate can be remarkably improved. The method has the advantages of mild reaction condition, no environmental pollution and low cost, and is simple to operate and convenient to prepare.
Patent•
14 Aug 2013
TL;DR: In this paper, the authors propose a three-dimensional space distribution of the bottom and upper part nozzles of a four-nozzle 3D jet mill for medicine crushing.
Abstract: The utility model discloses a jet mill with a nozzle group distributed in three-dimensional space. The jet mill comprises a cylinder body, wherein three upper part nozzles are uniformly arranged on the periphery of the cylinder body along the peripheral direction; a bottom nozzle is arranged at the bottom of the cylinder body; and axes of the three upper part nozzles and the axis of the bottom nozzle are intersected at one point. The jet mill ensures that the bottom nozzle and the three upper part nozzles form a four-nozzle three dimensional space distribution nozzle group, eradicates crushed and deposited material dead angles, and meets the technical requirements on on-line cleaning and sterilizing of medicine crushing.
Patent•
25 Jul 2013
TL;DR: In this article, a method capable of manufacturing a high-quality rice flour as a fine powder having a rounded grain shape achieved only by mechanical crushing on an equal level with an enzyme-used case, having a wheat flour-like quality, and being suitable for manufacture of bread, western-style cakes, noodles, or the like is presented.
Abstract: PROBLEM TO BE SOLVED: To provide a method capable of manufacturing a high-quality rice flour as a fine powder having a rounded grain shape achieved only by mechanical crushing on an equal level with an enzyme-used case, having a wheat flour-like quality, and being suitable for manufacture of bread, western-style cakes, noodles, or the likeSOLUTION: Provided is a method of manufacturing a rice flour including : grain refining by a crusher-granulator of water-dipped and moisture content-adjusted raw material rice ; pulverizing the rice by a jet mill ; and drying the rice by a flash dryer
Patent•
26 Sep 2013
TL;DR: In this article, a method for manufacturing a color composition capable of simultaneously making a diketopyrrolopyrrole pigment ultrafine and resin-coating on the pigment without changing a composition, through continuous jet mill dispersion under high-pressure while dispersing into a submicron region of 1 μm or smaller using ultrafine media.
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a color composition capable of simultaneously making a diketopyrrolopyrrole pigment ultrafine and resin-coating on the pigment without changing a composition, through continuous jet mill dispersion under high-pressure while dispersing into a submicron region of 1 μm or smaller using ultrafine media; and through producing a stable dispersion body, realizing the color composition having excellent viscosity stability and suppressing a crystalline foreign matter in the diketopyrrolopyrrole pigmentSOLUTION: A method is provided for manufacturing a color composition for a color filter including at least a diketopyrrolopyrrole pigment, a resin and a solvent A mill base is circulated and dispersed continuously by a media type disperser having media of 001-03 mmφ and a high-pressure jet mill
Patent•
10 Jul 2013
TL;DR: In this article, a shockproof structure for an air distribution plate of a jet mill is presented, where a buffer layer is arranged between the inner wall and the outer wall, and is used for eliminating and alleviating pressure fluctuation.
Abstract: The invention discloses a shockproof structure for an air distribution plate of a jet mill. A main body of the jet mill is fixedly arranged on a rack. The jet mill is provided with the air distribution plate. The air distribution plate is externally connected with a compressed air source through an air inlet pipe. Compressed air is distributed by the air distribution plate, and then is supplied to a nozzle in the jet mill. A weighing module is arranged at a joint of the main body and the rack. The air distribution plate is provided with an inner wall and an outer wall. A buffer layer is arranged between the inner wall and the outer wall, and is used for eliminating and alleviating pressure fluctuation and preventing the air distribution plate from shaking. Therefore, the influence of shaking of the air distribution plate on weighing accuracy is avoided.
01 Jan 2013
TL;DR: In this article, theoretical analysis and experimental study were carried out on the processing of ultra-fine SiC (Silicon Carbide is a kind of semiconductor material) with fluidized bed jet mill according to the application situation.
Abstract: Granule morphology exerts great influences on many properties of particle clusters. To obtain diversified particle shapes under different experimental conditions, theoretical analysis and experimental study were carried out on the processing of ultra-fine SiC (Silicon Carbide is a kind of semiconductor material) with fluidized bed jet mill according to the application situation. Special attention was paid to the main factors for controlling particle shapes. The shaping technique after pulverization process and the pretreatment techniques before ultra-fine pulverization process were also presented. The results show that well spherical or rhombus-like particles could also be obtained under varied experimental conditions of fluidized-bed jet mill. Experimental investigations into primary factors showed that particle shapes are correlated with jet mill structure (nozzle quantity), manipulated variables (comminuting intensity, gas-solid concentration, pressure, grinding time), and particle properties (granular size).
Patent•
13 Mar 2013
TL;DR: In this paper, the utility model discloses a jet mill removing oxygen by a circulating flow, comprising a grinding chamber and a powder filter, wherein the powder filter and the grinding chamber, a gas storage tank, a nitrogen compressor and a compressed gas freeze-drying unit form a circulating loop; simultaneously, a manual adjusting valve is further connected with the air storage tank and the nitrogen compressor in parallel, on the circulating loop.
Abstract: The utility model discloses a jet mill removing oxygen by a circulating flow, comprising a grinding chamber and a powder filter, wherein the powder filter, the grinding chamber, a gas storage tank, a nitrogen compressor and a compressed gas freeze-drying unit form a circulating loop; simultaneously, a nitrogen source is further arranged on the circulating loop; and a manual adjusting valve is further connected with the air storage tank, the nitrogen compressor and the compressed gas freeze-drying unit in parallel, on the circulating loop. Additionally, a spring automatic oxygen-removing valve is arranged between the nitrogen source and the powder filter. The jet mill removing oxygen by a circulating flow disclosed by the utility model is simple in process, convenient to machine, and is capable of increasing the working efficiency of equipment and reducing energy consumption while ensuring machining safety.
Patent•
[...]
10 Jan 2013
TL;DR: In this paper, the authors proposed an ejector for acceleration in accelerating tubes of dispersed material in the first turn, extending life of accelerating tubes by gas dynamic protection of tube walls against abrasion damage by dispersed flow.
Abstract: The invention relates to jet engineering, specifically – to the jet mills for grinding coarse materials. The invention is aimed on improving ejectors for acceleration in accelerating tubes of dispersed material in the first turn, extending life of accelerating tubes by gas dynamic protection of tube walls against abrasion damage by dispersed flow. Novelty in the disclosed design of an ejector consists in the original solutions of accelerating tubes in the form of a set of easily removable nozzle blocks installed in a cartridge. Another new solution consists in the original design of a nozzle apparatus, in which the ring nozzles are optimally located that cover the flow channel of accelerating tube and oriented in such a way that they provide acceleration of flow in the tube and effective protection of the walls of accelerating tubes.