Jet mill

About: Jet mill is a research topic. Over the lifetime, 803 publications have been published within this topic receiving 5686 citations.

Fluidized bed jet mill

Abstract: The utility model discloses a fluidized bed jet mill which comprises a rack, a milling chamber which is connected with the rack, and a grading chamber which is positioned at the upper part of the milling chamber and which is communicated with the milling chamber, wherein the grading chamber is internally provided with a grading impeller which is driven by a driving device, and a discharge hole which is connected with the grading impeller. The fluidized bed jet mill is characterized in that an air seal element is arranged between the grading impeller and the discharge hole; at least two circles of air seal holes with unequal distribution radiuses are formed in the air seal element. According to the technical scheme, on the basis of the conventional fluidized bed jet mill, the design of a seal structure between the grading impeller and the discharge hole is improved, the situation that rough grains enter a finished product from the gap between the grading impeller and a discharger is generally prevented, and the result shows that no rough grain enters the finished product when the rotation speed of the grading impeller 1 is 80m/s'.

Grinding of Hard Fine Materials by Jet Mill

Abstract: The grinding rate characteristics of hard fine materials was investigated with a laboratory scale jet mill. The variations of product size distributions of synthetic diamond, alumina and quartz sand with the number of passes were described by using a grinding kinetics approach for various values of the grinding air pressure and the feeding rate. As a result, the grinding rate was found to decrease with increase in the hardness of comminuted materials from quartz to alumina and then to increase slightly for synthetic diamond due to its low impact strength. This trend is more pronounced for all materials with higher gas pressure and lower material feed rate. Thus, it is proved experimentally that the grinding characteristics of very hard materials even around 1, μm with the jet mill still fits the rate equation of comminution but the effect of operational conditions becomes low.

Neodymium-iron-boron magnet manufacturing process

Abstract: The invention discloses a neodymium-iron-boron magnet manufacturing process. The neodymium-iron-boron magnet manufacturing process comprises the following steps that a, smelting:, loading is performedfirstly and then vacuumizing to be less than 1 Pa is carried out, the low-power heating is started, heating while air extracting is performed, the moisture of the gas in an adsorption state is gradually de-absorbed and extracted along with temperature rise until the furnace burden is generally dark and red, a valve is closed and argon is injected, and power-increasing temperature rise is carriedout until the furnace burden is completely molten, five minutes of refining is carried out, the power is reduced after refining is completed and pouring is carried out, and then cooling is carried outafter pouring is finished; b, powder preparing: the neodymium-iron-boron particles are put into a jet mill to perform high-speed collision, so that the particles are subjected to high-speed collisionto form powder, the formed powder is collected and put into a screening machine to be screened, and impurities in the magnetic powder are removed; c, forming; d, sintering; e, machining, wherein theneodymium-iron-boron magnet obtained after sintering is a blank, and further machining is required to obtain products with different dimensions, sizes and shapes; f, surface treatment; and g, finishedproduct inspection and packaging are carried out.

Acid leaching lead slime and cast-weld lead slag combined recycling device

Abstract: The utility model belongs to the technical field of storage battery acid leaching lead slime and cast-weld lead slag recycling The utility model relates to a recycling device, in particular to an acid leaching lead slime and cast-weld lead slag combined recycling device The device comprises a feeding device, a crusher, a jet mill, a cyclone separator and a pulse bag-type dust collector, the feeding device comprises a hopper cover and a hopper; the lower port of the hopper is connected with the crusher; the crusher is connected with a jet mill through a spiral feeder; a discharge hole A is formed in the bottom of the jet mill; the discharge hole A is connected with the hopper through a backflow pipe; the jet mill is connected with the cyclone separator through a pipeline A; a dischargingport B is formed in the bottom of the cyclone separator, the cyclone separator is connected with the pulse bag-type dust collector through a pipeline B, a discharging port C is formed in the bottom ofthe pulse bag-type dust collector, powder collected by the discharging port B reaches the micron level, powder collected by the discharging port C reaches the nanometer level, powder of different particle sizes is adopted for recycling according to needs, and energy is saved

Method for producing fine silicon powder, and method for producing fine silicon nitride powder

Abstract: [Problem] To provide a method for producing fine silicon powder which allows for collection of high-purity flaky fine silicon powder from silicon cutting scraps generated during slicing of a silicon ingot, without using a mechanical pulverization means, such as a ball mill, jet mill, or the like Further, to provide a method for producing fine silicon nitride powder using flaky fine silicon powder as a starting material [Solution] A silicon ingot 3 fixed to a fixing plate 4 containing aluminum hydroxide is cut using a fixed abrasive grain wire saw 2, and a slurry containing a silicon cutting powder, impurities, and coolant liquid is recovered The recovered slurry is subjected to solid-liquid separation to extract a cake 18 containing the silicon cutting powder and impurities The cake 18 is washed for 20-60 minutes through immersion and stirring in an aqueous sulfuric acid solution containing 1-40 wt% of sulfuric acid and heated to 50-90°C