Jet mill

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

Nozzle air inlet improved structure for jet mill

Abstract: The invention discloses a nozzle air inlet improved structure for a jet mill. The nozzle air inlet improved structure comprises a smashing cylinder and an annular air distribution disc with a gap; the air distribution disc is fixedly arranged on the periphery of the smashing cylinder, and the two ends of the gap of the air distribution disc are sealed; and air distribution space is formed in the air distribution disc, is communicated with an external-connection compression air source through an air inlet pipe, and is communicated and externally connected with a plurality of nozzles through an air inlet pipe. The nozzle air inlet improved structure is provided with the gap and the annular air distribution disc closed at the gap end, and under the equal gas consumption, the nozzles can be enlarged and are more close to the inner wall of the smashing cylinder, so that the effective range of the nozzles is increased, and the large impact force is obtained; materials close to the cylinder wall can smoothly enter the spraying airflow, and the smashing efficiency and the yield of the whole jet mill can be improved.

Modular spiral jet mill: an innovative tool for targeted micronization of pharmaceutical products

Abstract: Approximately 70% of new chemical entities fall into the BCS Class II category [1], hence requiring application of appropriate pharmaceutical technologies during dosage-form development to achieve an improved biopharmaceutical profile. For this class of drugs, the dissolution rate is the key parameter for the in-vitro evaluation of delivery systems. In fact, increasing the dissolution rate could lead to an enhancement in bioavailability and therapeutic effect [2]. Micronization is one of the most popular, robust and reliable process in the pharmaceutical field for improving the bioavailability of poorly soluble APIs by increasing particle surface area through particle size reduction. The effect of the spiral jet mill on the powder to be milled is related to many geometric and process parameters; in fact, each powder is characterized by a particular physico-mechanical profile and therefore requires a specific mill configuration. According to literature [3-6] and based on practical experience in using jet-milling equipment, 18 parameters (i.e., 15 geometrical and 3 process parameters) have been identified as critical for their impact on the micronization performance and on the subsequent powder classification capabilities. This work deals with the development and the testing of a modular spiral jet mill that could be used to generate, theoretically, 215 different jet-mill configurations. This modular mill will represent a tool to be used for the micronization and classification performances investigation and optimization.

On the Structural and Magnetic Properties of Mn-Bi Alloy Jet Milled at Different Feed Rates

Abstract: Mn50Bi50 alloy was prepared using arc melting method with subsequent homogenization treatment. The homogenized alloy was crushed and subjected to jet mill at different feed rates. The weight fraction of the LTP MnBi phase determined by the Rietveld refinement of the XRD pattern was found to be 89% in the as-homogenized and crushed alloy. The crushed alloy was subjected to jet milling at different feed rates from 0.5 to 1.5 g/min. Structural studies show that increase in feed rate leads to phase decomposition. Magnetic studies show that as-homogenized crushed alloy exhibits a magnetization of 60 emu/g. Jet milling leads to increase in coercivity and a decrease in magnetization. However, it was found that increase in the feed rate during jet milling leads to decrease of both coercivity and magnetization. Microstructural studies show that jet milling leads to decrease in particle size. Jet milling done at a lower feed rate helps in yielding the lowest average particle size compared to remaining feed rates in the Mn-Bi alloy. The spin reorientation transition temperature of the Mn-Bi alloy decreases with jet milling and varies at different feed rates. The coercivity of the Mn-Bi powder jet milled with a lower feed rate increases from 14.7 kOe at room temperature to 19.4 kOe at 400 K.

Method and apparatus for producing slurry, slurry produced using the same and sintered body

Abstract: PROBLEM TO BE SOLVED: To obtain low viscosity slurry which has high concentration and is used for slip casting. SOLUTION: The solvent is circulated and returned to a mixing tank 11 but powder is not mixed yet at this point of time (S3), and therefore a prescribed quantity of powder is mixed in the solvent to obtain a slurry precursor (mixing step: S4). The slurry precursor is introduced to a collision unit 15 to be treated with wet jet mill (S2) and is returned to the mixing tank 11 again. The slurry having the prescribed concentration of the powder is obtained by repeating the confirmation of the powder concentration (S3), the mixing step (S4) and the treatment step (S2) with the wet jet mill until the powder concentration reaches a set value. The slurry precursor having concentration which does not reaches the prescribed value yet is further treated with the wet jet mill to increase the powder concentration step by step and finally treated with the wet jet mill in a state of having the high powder concentration and the high fluidity. As a result, the slurry having high powder concentration and low viscosity is obtained. COPYRIGHT: (C)2010,JPO&INPIT

Preparation of organohalosilanes

Abstract: Organohalosilanes are prepared by reacting metallic silicon particles with an organohalide in the presence of a copper catalyst. A contact mass composed of metallic silicon and copper catalyst contains an effective amount of a catalyst powder obtained by mechanical surface treatment of a powder mixture of tin powder and another metal, typically copper powder, on a ball mill, stamp mill, jet mill,mechanofusion device or the like.