Jet mill

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

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.

Preparation method of silicon micropowder for high-density integrated circuit packaging

Abstract: The invention relates to a preparation method of silicon micropowder for high-density integrated circuit packaging, which comprises the following steps: (1) adding fused quartz sand with the particle size of 0.1-3mm into a milling cavity of a ball mill, milling for 25-35 minutes, and directly grading to obtain the silicon micropowder with the medium particle size of 13-15 mu m for later use; (2) adding fused quartz powder with the particle size of 8-10 mu m into a milling cavity of a jet mill, and carrying out jet pulverization for 1.5-2.5 hours, wherein the silicon micropowder with the medium particle size of 2.5-3.5 mu m can be sent to a grading region by the jet so as to be separated; and (3) adding the silicon micropowder milled by the ball mill and the silicon micropowder pulverized by the jet mill in a weight ratio of (6-7):2 into a mixer, and uniformly mixing to obtain the silicon micropowder for integrated circuit packaging. The silicon micropowder for high-density integrated circuit packaging has the advantages of uniform particle size distribution, favorable flowability, low viscosity, small surface area, high bulk density and high filling ratio (up to 85%), can be uniformly mixed with a resin to form a film, and can substitute spherical silicon micropowder.

Decontamination powder for human skin in chemical warfare - comprises milled mixt. of magnesium oxide and calcium hypochlorite

Abstract: Decontamination powder for use on human skin exposed to materials employed in chemical warfare is prepd. by milling a mixt. of MgO powder with particle size 15-20 mu, and Ca hypochlorite powder, size 80-200 mu. in a jet mill until the calcium hypochlorite powder has been reduced to a size of is approx. 40 mu withtout altering the size of the MgO, powder. The inner surface of the mill chamber is pref. lined with polyurethane. For the premilling of the MgO, a mill chamber lined with boron carbide is pref. used. The powder has a large bulk vol., about twice that ot conventional powders so a large specific surface is available for reaction with the poisonous substances. The powder mixt. is not dead-milled but retains its surface activity.

Production method of as-cast neodymium-iron-boron

Abstract: The productino method of as-cast Nd-Fe-B includes the following steps: placing Nd-Fe-B alloy in sintering furnace which can be vacuum-pumped, introducing hydrogen gas into it at room temp., making the hydrogen pressure in the sintering furnace relain at 0.8-1.2X10 to the power 5 Pa for 2-4 hr. retaining pressure and cooling to room temp., then taking out powder material containing Nd-Fe-B alloy, feeding it into jet mill to grind to obtain powder material whose grain size is 3-5 micrometer, pressing and forming, heating the formed product to 300-500 deg.C, temp.-retaining for 0.5-2 hr for removing hydrogen, finally heating to 1030-1090 deg.c sintering, retaining temp. for 1-4 hr. cooling so as to obtain the invented product.

Method for preparing superfine uniform yttrium oxide

Abstract: The invention discloses a method for preparing superfine uniform yttrium oxide and relates to the technical field of preparation of chemical products. The preparation method comprises the following specific steps: weighing yttrium oxide powder, putting the yttrium oxide powder into a reaction kettle, adding pure water, then performing uniform mixing and stirring, adding a surfactant and a stabilizing agent, and performing stirring at a uniform speed to obtain a completely-soaked mixture; firstly adding zirconium beads to a sand mill, then adding the soaked mixture to the sand mill, and performing milling to obtain uniformly-dispersed slurry; containing the uniformly-dispersed slurry in a charging basket container, connecting one end of a peristaltic pump with the charging basket container,and connecting the other end of the peristaltic pump with a drying machine; spraying vaporous slurry into the drying machine through the peristaltic pump; drying the sprayed slurry in the drying machine; and dispersing the dried product collected from the drying machine through a jet mill to obtain a product, namely the superfine uniform yttrium oxide. The method disclosed by the invention is simple in preparation process, free of wastewater, friendly to environment and low in cost and can be used for large-scale production.