Showing papers on "Jet mill published in 2012"

Process for the manufacture of carbon sheet for an electrode

Abstract: A method of making a single carbon sheet for an electrode includes mixing activated carbon; adding a dispersion comprising a PTFE binder and water to the activated carbon to form a mixture; adding the mixture to a jet mill, and fibrillating the PTFE binder; and feeding the mixture with fibrillated PTFE to a roll mill to form a single carbon sheet in a single pass.

Sintered neodymium iron boron waste remoulding method

Abstract: The invention discloses a sintered neodymium iron boron waste remoulding method. The sintered neodymium iron boron waste remoulding method comprises the steps of: a), crushing neodymium iron boron bulky waste into powder smaller than 40 meshes, putting the powder into a jet mill, and pulverizing, wherein the rotation speed of the jet mill speed is set at 800-1000rpm, the interior of the jet mill is protected by nitrogen gas, and the oxygen content is controlled at 2ppm; b), filling the powder finely ground by the jet mill into a material barrel protected by the nitrogen gas, adding 1-2ml of gasoline and 0.2-1ml of an oxidation preventer into each kilogram of the powder, and putting the material barrel into a mixer for stirring and mixing; and c) moulding the mixed powder, and sintering into a neodymium iron boron magnet. The neodymium iron boron magnet prepared by the method has normal cross-section crystallization; abnormal coarse-grained phenomenon does not appear; the performance of the neodymium iron boron magnet is consistent with that before the neodymium iron boron magnet is processed; and a normal material flow can be adopted. The sintered neodymium iron boron waste remoulding method is easy and convenient to operate and convenient and direct to process; and by the sintered neodymium iron boron waste remoulding method, waste of resources can be reduced and cost can be saved.

Organic coating method for titanium dioxide for producing color master batch

Abstract: The invention provides a method for organic surface treatment of titanium dioxide for producing color master batch The method is characterized that one or more organic silicon material compound is used for acting on the titanium dioxide grains by a jet mill for surface-treating the titanium dioxide The method can obviously solve the problems of no high-temperature resistance, easy yellowing andpoor dispersibility caused when the titanium dioxide is used for producing the plastic color master batch Moreover, the method also has the advantages of easy operation, convenient manufacture, mildreaction conditions, no secondary pollution, low cost and the like

Production method of cladded high-water-dispersity carbon black product

Abstract: The invention discloses a production method of a cladded high-water-dispersity carbon black product. The production method comprises the following steps of: fully mixing carbon black and an anionic surfactant serving as raw materials in the mass ratio 100:(0.5-30) in a stirring kettle; introducing the stirred material into a jet mill; extruding, impacting, shearing and rubbing between carbon black and carbon black particles as well as between the carbon black and the mill wall under the high-speed high-pressure air current action of the mill; and adsorbing the lipophilic end of the anionic surfactant onto the surface of ultrafine carbon black particles to form a uniform clad layer serving as a novel carbon black product. The method has a simple process and low cost, and is environmentally-friendly; the product can be dissolved into water without stirring or dispersing after being put into water; and after clear water becomes black, the dispersion state can keep stable and invariant for certain months.

Supersonic jet milling system

Abstract: The invention provides a supersonic jet milling system, which relates to the technical field of powder material milling. A main body comprises an air compressor, an air storage tank, an air freeze dryer, a supersonic jet mill, a cyclone separator, a dust remover and a draught fan, wherein the right end of the air compressor is connected with the air storage tank; the right end of the air storage tank is connected with the air freeze dryer; the right end of the air freeze dryer is connected with the supersonic jet mill; the right end of the supersonic jet mill is connected with the cyclone separator; the right end of the cyclone separator is connected with the dust remover; and the right end of the dust remover is connected with the draught fan. The supersonic jet milling system is reasonable in structural design, has the advantages of low noise and no vibration and is suitable for a dry type ultrafine milling process; since the impact velocity is high, particles 1-10 micrometers in size are very easy to obtain, and coarse particles in a product can be continuously and circularly milled, so the product with uniform particles and a small particle size distribution range can be obtained.

Method for operating a jet mill and jet mill

Abstract: The method involves supplying particles as grinding stock in a grinding chamber (5) of the jet mill (1). The grinding stock is grinded to fine particles by grinding as superheated water vapor or technical gas is used as operating fluid. The surface active additive is supplied to the grinding stock for stabilizing the generated fine particles. The additive is mixed with the grinding stock before grinding. The additive is directly introduced in the grinding chamber. The operating fluid contains hydrogen or helium as technical gas. An independent claim is included for a jet mill with an operating fluid supply unit.

Jet mill and method for operation of a jet mill

Abstract: A method for the operation of a jet mill with an integrated dynamic air classifier, wherein particles are fed as grinding stock into a grinding chamber of the jet mill and are ground there into ultra-fine particles by grinding, in that superheated steam or technical gases is/are used as working stock, wherein at least one surface-active additive is fed to the grinding stock for stabilization of the generated ultra-fine particles. A jet mill for performing this method, having an integrated dynamic air classifier, and a grinding chamber into which superheated steam or technical gases are provided as working stock via working stock feed devices as grinding stock and in which the grinding stock is ground into ultra-fine particles by grinding, and wherein feeding devices for at least one surface-active additive for stabilization of the generated ultra-fine particles are provided.

Processing device for superfine tea powder

Abstract: The invention relates to a processing device for superfine tea powder, which comprises a compression air power source, an oil-water separation device, a gas storage tank, a primary filter, a gas drying machine, a precise filter, a sterilization filter, a material cabin, a fluidized bed jet mill, a cyclone collector, a bag-type collector and a high pressure draught fan which are sequentially connected. The device integrates crushing, gradation, mixing and homogenization into a whole and achieves a unique advantage of on-line operation.

Method for manufacturing cemented carbide

Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a cemented carbide, in which the bias of particle size distribution of hard phase particles is less than that of conventional oneSOLUTION: The method for manufacturing the cemented carbide comprises: preparing a slurry of a WC powder (a hard phase raw material powder) composing a hard phase of the cemented carbide; and carrying out a cracking step of cracking the WC powder in the slurry and a mixing step of mixing the WC powder and a binder phase raw material powder composing a binder phase as individual steps, wherein at least the cracking step or the mixing step is carried out without using a high-energy stirring method such as an attritor and an impact jet mill This prevents excessive pulverization of WC particles upon stirring so as not to induce bias in the particle size distribution of the WC particles, thereby preventing size variation of the hard phase particles in the cemented carbide

Influence of the Operating Temperature on the Ultrafine Grinding in Superheated Steam Jet Mill

Abstract: Effects of operating temperature on the fineness and yields of the ultrafine circulating fluid bed fly ashes (CFBAes) have been studied. Results show that the temperature of selection zone increased faster than that of crushing zone. Introduction of secondary air decreased the temperature of crushing zone, which would make the classifier invalid. Also, ambient temperature and insulation measures have a great impact on the ultrafine grinding in superheated steam jet mill

Jet mill crusher

Abstract: The invention relates to a jet mill crusher, which comprises a machine frame, a charging device, a feed funnel, a jet mill grinding chamber, an air source and a collection bag which is fixed to the bottom of the jet mill grinding chamber; the jet mill grinding chamber is fixedly arranged on the machine frame; the feed funnel is arranged above the jet mill grinding chamber; the air source is communicated with the lower part of the feed funnel by an air pipe; the tail part of the air pipe is communicated with the jet mill grinding chamber; a discharge hole of the charging device is positioned above the feed funnel; and a pressure stabilizing vibrator for controlling the feed speed is also arranged on the charging device and is controlled by a pressure stabilizing vibration controller. According to the jet mill crusher, after a pressure stabilizing vibration feeding device is used, the feed speed is controlled effectively, the stability of feeding is ensured, the production efficiency is improved, and the quality of products is stable.

Circulating type jet mill and milling system thereof

Abstract: The invention relates to a milling device and system, specifically relates to a circulating type jet mill with convenience in use, high classifying precision and good milling effect, and relates to a milling system matched with the circulating type jet mill. The circulating type jet mill provided by the invention comprises a frame (1), a milling chamber (2) and a compressing air reservoir (3), wherein the milling chamber (2) is arranged on the frame (1); the compressing air reservoir (3) is connected with the lower part of the milling chamber (2); the milling chamber (2) is of annular oval shape; a classifying device is arranged on the upper part of the milling chamber (2); a feeding port (4) and a plurality of milling nozzles (5) are arranged on the lower part of the milling chamber (2); air inlet ends of the milling nozzles (5) are communicated with the compressing air reservoir (3); and air outlet ends of the milling nozzles (5) are respectively in tangential connection with the circles on the lower part of the milling chamber (2). The milling system provided by the invention comprises any circulating type jet mill, a product separating device and an air compressor (14), wherein the product separating device is connected with the outlet end of the classifying device and the air compressor (14) is connected with the compressing air reservoir (3).

Cyclonic jet mill

Abstract: The utility model discloses a cyclonic jet mill, which mainly comprises a grader, wherein the grader is installed on a crushing box, a crushing cavity which is driven by a power device is rotatably installed inside the crushing box and is provided with an inner cylinder body which has a crushing space, an outer cylinder body is installed in a sealing mode on the periphery of the inner cylinder body, an airflow channel which is communicated with a compressed air source is arranged between the inner cylinder body and the outer cylinder body, and an airflow jet nozzle is arranged on the lateral wall of the inner cylinder body and is communicated with the airflow channel and the crushing space. The cyclonic jet mill solves the technical problems that dead corners where the air can not blow are formed in the crushing space and materials can not be ground adequately. The cyclonic jet mill is reasonable in design and widely applied to ultra-fine crushing of materials such as raw mineral materials, raw chemical materials, thermosensitive materials and the like.

Method for producing electric melting zirconia for zirconium iron pink glazes

Abstract: The invention discloses a method for producing electric melting zirconia for zirconium iron pink glazes. The method sequentially includes the following steps of 1) subjecting an electric melting zirconia hollow sphere to a coarse grinding, and controlling the particle size D50 to be in a range from 13um to 18um; 2) feeding electric melting zirconia crude powders in a jet mill, controlling the working pressure of a jet milling nozzle to be in a range from 0.65Mpa to 0.8Mpa, and adjusting the operation control frequency of an induced draft fan to be in a range from 35Hz to 45Hz; and 3) adjusting the operation control frequency of a grader to be in a range from 35Hz to 45Hz, strictly controlling the particle size distribution of the electric melting zirconia powders, to enable D10 to be no less than 0.6 [mu]m, D50 to be maintained between 2.5[mu]m and 3.0[mu]m and the difference between D90 and D10 to be no more than 6um.

Full-ceramic and pollution-free fluidized bed jet mill

Abstract: The utility model discloses a full-ceramic and pollution-free fluidized bed jet mill. The full-ceramic and pollution-free fluidized bed jet mill comprises a crushing chamber, a classifying chamber, an upper cover, a feeding auger, a crushing spay nozzle, an air seal and a classifying impeller, wherein a feed opening of the feeding auger is connected with a feeding hopper; a discharge opening of the feeding auger is connected with a feed opening of the crushing chamber; the crushing spray nozzle is arranged in the crushing chamber; the air seal and the classifying impeller are arranged in the classifying chamber; ceramic linings are respectively arranged on the inner wall of the feeding hopper, the inner wall of a feeding pipe, the inner wall of the crushing chamber, the inner wall of the classifying chamber and the inner wall of the upper cover; a feeding propulsion screw, the crushing spray nozzle and the air seal are respectively made of ceramic materials; and the classifying impeller is an integral full-ceramic impeller which is manufactured by adopting a cold isostatic pressing method. The part of the full-ceramic and pollution-free fluidized bed jet mill provided by the utility model, which is contacted with the crushed materials, is completely made of full-ceramic material; the pollution to the crushed material in the crushing process is avoided; and meanwhile, the full-ceramic and pollution-free fluidized bed jet mill has the advantages of capability of meeting the fineness requirement, high cutting precision, adjustable crushing particle size and narrow particle size distribution range.

Operation method for jet mill and jet mill

Abstract: PROBLEM TO BE SOLVED: To provide an operation method for a jet mill with high operation efficiency and a jet mill where the operation method is performed.SOLUTION: A jet mill 1 is a jet mill 1 in which a dynamic air separation apparatus is built and which crushes powdered raw material M in an operation medium to obtain fine particles by introducing particles as the powdered raw material M through a powdered raw material introduction apparatus 3 into a powdering chamber 5 and by introducing super-heated steam or industrial gas (He and H) as the operation medium through an operation medium introduction apparatus 13. In the jet mill 1, surface activation additive introduction devices 14a to 14c for at least one kind of surface activation additive for stabilizing the produced fine particles are installed. The surface activation additive prevents the powdered fine particles from aggregation, makes energy consumption conventionally consumed for disaggregation unnecessary, and leads to reduction of a cost.

A Novel Process for Making Spherical Powders of High Nb Containing TiAl Alloys

Abstract: A novel process was developed to make micro-fine spherical high Nb containing TiAl alloyed powders in quantity. Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y(at%) ingot prepared by vacuum induction melting was heat-treated for homogenization, and then machined with a crusher. The chippings were refined by fluidized bed jet milling, and subsequently spheroidized with radio frequency (RF) argon plasma. The effects of processing parameters on powder characteristics were studied. By fluidized bed jet milling, the particle size and distribution uniformity both decline with the rise of classifier frequency. Above 5800rpm, the number-average diameter is lower than 20μm with a bimodal particle size distribution. The powders consist of coarse plate-shaped particles and some finer flaky debris, and with the further rise of the frequency, the amount of debris gradually increases. The plasma-spheroidized powders are found to possess good sphericity and composition homogeneity with phase dominated by supersaturated α2-Ti3Al. The granulometric characteristics of the spherical powders strongly depend on those of the feed powders. For the jet milled powders below 5800rpm, due to the relatively lower size distribution uniformity, the fine particle fraction reduces after spheroidization, which causes an obvious improvement of distribution uniformity and the corresponding increase of number-average diameter

Ultrafine grinding device and ultrafine grinding method

Abstract: PROBLEM TO BE SOLVED: To provide an ultrafine grinding device having a novel structure capable of practically obtaining fine powder of nano-order effectively and stably, and an ultrafine grinding method.SOLUTION: The ultrafine grinding device ultrafine-grinds grainy materials to be crushed (raw materials). It includes a jet mill 12 and an ejector type grinding pipe 30. Raw material supplying means 2 and 3 are connected to a suction chamber 31 of an ejector type raw material jet pipe 11 of the jet mill 12 by having airtight retaining means 5A, 5B and 6. The product exit of the jet mill 12 is connected in such a manner that swirl flow ground matter from the jet mill 12 can be introduced into the suction chamber (an explosion grinding chamber) 31 of the ejector type grinding pipe 30, and an expansion grinding (an explosion grinding) by rapid decompression is conducted for the materials to be crushed in the explosion grinding chamber 31.

Method of preparing rot-proof and ant-proof treatment particle liquid for filling in timber

Abstract: PROBLEM TO BE SOLVED: To provide a method of preparing rot-proof and ant-proof treatment particle liquid for filling in timber, capable of atomizing metal of which atomization is difficult and which can be easily plastically deformed and compounds of the metal and preparing chemicals with low viscosity so as to enable easily penetration of effective components in the chemicals into the timber, and of preventing elution of the filled components from the timber so as to exhibit high rot-proof and ant-proof effects.SOLUTION: To deeply penetrate particles including metal (or metallic compound) having rot-proof and ant-proof effects into inside without causing clogging on a timber tissue surface, high-pressure injection is applied one or more times with respect to mixed liquid in which the particles and a dispersing agent are mixed, by using a high pressure wet type jet mill device, so that an average particle size of the particles becomes less than 1,000 nm.

Production process of glucomannan meal

Abstract: The production process of glucomannan meal includes the following steps: 1. crushing material konjaku powder in a crusher at 60 deg.c to 80-200 mesh; 2. further crushing konjaku powder and stripping capsula of konjaku powder in the bottom boiling fluidized bed of a jet mill at temperature below zero deg; and 3. separating impurity from glucomannan meal via airflow classification so as to obtain 80-200 mesh glucomannan meal. The present invention has high production efficiency, high output and other advantages.

Air source control device

Abstract: An air source control device includes an air compressor, a moisture detector, a moisture qualified channel, a moisture absorbing device, an oxygen content detector, an oxygen absorbing device, an oxygen content qualified channel, a pressure detector, a pressure qualified channel, a partial pressure device and an air source outlet. The air source control device is mainly used for the air source control of the jet mill during the production of NdFeB permanent magnetic materials, can effectively control the oxygen content and the humidity in the air, and can prevent a small amount of oxygen or the damp air from entering the jet mill to influence the quality of the magnetic powder.

Automatic material concentration control system of fluidized bed jet mill

Abstract: The utility model discloses an automatic material concentration control system of a fluidized bed jet mill, which comprises an automatic feeding machine and a jet mill, wherein the automatic feeding machine is connected with the jet mill; and the automatic material concentration control system also comprises an intelligent control mainframe which is respectively connected with the automatic feeding machine and the jet mill The intelligent control mainframe is adopted to respectively control the material concentration and the feeding speed, thus maintaining the optimum concentration of fluidized material all the time; and therefore, the best working condition of the jet mill is guaranteed, and the working efficiency is improved

Large-sized high-temperature-resistant flat ceramic jet mill

Abstract: The utility model discloses a large-sized high-temperature-resistant flat ceramic jet mill. A metal upper cover, a middle ring and a lower cover are mutually fastened to form a flat disc. An upper cover liner is arranged on the internal side of the upper cover. A lower cover liner is arranged on the internal side of the lower cover. Middle ring liners are respectively arranged on the peripheral parts of the upper cover liner and the lower cover liner. The upper cover inner liner, the lower cover liner and the middle ring liners form a closed crushing cavity. By using reactively sintered silicon carbide as a liner material on the flat jet mill, the wear resistance is very good, and the quality of finished products is greatly improved; and by adopting partitioned structures, the difficulty in manufacturing reactively sintered silicon carbide liner components is greatly reduced, the size limitations of production equipment are broken through, the large-sized high-temperature-resistant flat ceramic jet mill with the diameter being larger than 1meter can be manufactured, the technology is internationally advanced, and the requirements on automatic, high-yield and high-quality material crushing and production are satisfied.

Method for cleaning grading wheel of jet mill

Abstract: The invention discloses a method for cleaning a grading wheel of a jet mill, which is characterized by comprising the following steps of: A, plugging the powder inlet and the powder outlet of the grading wheel of the jet mill by using a plugging material; and B, collecting glass piece residues on the grading wheel of the jet mill in the small cylinder of the grading wheel and sucking away by using a dust collector. The method for cleaning the grading wheel of the jet mill is characterized in that: the plugging material is rubber cushions. The invention aims to overcome defects in the prior art and provides the method for cleaning the grading wheel of the jet mill, which is easy and ensures that a cleaning procedure can be simplified, a cleaning period can be shortened, the waste of labor and materials can be reduced and the comprehensive yield of products can be improved.

Slurry and slurry manufacturing method

Abstract: The present invention is a slurry manufacturing method whereby a slurry is manufactured by re-pulverizing with a jet mill all or a portion of abrasive grains which have been pulverized with either a roller mill or a ball mill to achieve an average roundness of the abrasive grains of 0.900 or greater and mixing the abrasive grains with 0.900 or greater average roundness with a coolant, and a slurry wherein the average roundness of the abrasive grains mixed in the slurry is 0.900 or greater. It is thus possible in slicing work with a wire saw, even when using abrasive grains with a narrower grain diameter than grit size #2000 for minimizing Kerf Loss, to alleviate cost increases arising from slicing performance declines arising from declining abrasive grain concentration, or from degraded slicing quality or declining productivity.

Method for pulverizing powder

Abstract: A method for pulverizing powders is provided, wherein powders are pulverized in a jet mill, in which a mill room does not have a place for powder retention, by an airflow generated in the mill room. The method includes a mixing step (S10), wherein an auxiliary agent is mixed with the powders; a heating step (S12), wherein a high-pressure gas is heated; a supply step (S14), wherein the high-pressure gas heated in the heating step is supplied to the mill room; an input step (S16), wherein the powders mixed with the auxiliary agent in the mixing step are input into the mill room in a designated amount, such that the concentration of the auxiliary agent in the mill room is lower than an ignition concentration; and a pulverizing step (S18), wherein the powders are pulverized by an airflow which is generated in the mill room by the high-pressure gas supplied in the supply step.

Operating method for a jet mill plant and jet mill plant

Abstract: The present invention relates to an operating method for a jet mill plant (1), wherein as operating medium for a jet mill (2) use is made of superheated water vapour at low pressure (2 to 10 bar), and the water vapour, downstream of the jet mill (2) and the separation of grist, is conducted in a circuit back into the jet mill (2) via a compressor (12) for effecting a pressure and temperature increase. The invention also provides a jet mill plant (1) having a jet mill (2) which is designed for operation with superheated water vapour at low pressure (2 to 10 bar), wherein a jet mill water vapour discharge line (outlet line 17, used steam discharge line 18, compressor feed line 19), a compressor (12) and a jet mill water vapour feed line (compressor discharge line 22, milling vapour inlet 4, nozzle feed line 23) form, together with the jet mill (2), a circuit for water vapour, such that water vapour from the jet mill (2) is conducted in a circuit back into the jet mill (2) via the compressor (12) for effecting a pressure and temperature increase.

Slurry and method for producing slurry

Abstract: The present invention is directed to a method for producing a slurry used in a wire saw, including: re-pulverizing with a jet mill part or all of the abrasive grains pulverized with a roller mill or a ball mill such that the abrasive grains have an average circularity of 0.900 or more; and blending the abrasive grains whose the average circularity is 0.900 or more with a coolant to produce the slurry, and to a slurry including blended abrasive grains having an average circularity of 0.900 or more. The invention enables suppression of reduction in slicing capability due to reduction in abrasive-grains concentration and of increased costs due to reduction in slicing quality and in productivity, even when abrasive grains having a grain diameter smaller than that of #2000-size abrasive grains are used to reduce a kerf loss.