Studies in fluid energy grinding
TL;DR: In this paper, the results of 239 experimental runs on grinding calcite of particle size range 0.15-1.70 mm in an experimental jet mill of 20 mm diameter, using feed rates of 5-150 g/min and air pressure of 3-6 kg/cm 2 G are reported.
About: This article is published in Powder Technology.The article was published on 1969-10-01. It has received 30 citations till now. The article focuses on the topics: Grinding & Jet mill.
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TL;DR: In this paper, the authors present results on organic crystals' jet milling in terms of specific energy consumption with an adaptation of the correlation proposed by Sarma, showing that, within the operating energy range and above a critical energy value, the creation of specific surface area corresponds to an increase of fine particles production.
131 citations
TL;DR: In this paper, the equipment most commonly used in fine particles processing and related process parameters is described, including Tumbling ball, stirred, vibratory and fluid energy mill types, and a number of factors influence the choice of equipment, including the end-use of the product, required product size distribution, sensitivity of the material to heat and purity requirements.
Abstract: The growing demand for ultrafine powders, coupled with stringent quality requirements, calls for continuous improvements in all aspects of fine particles production. The high energy costs involved in comminution is also an additional motivator. The equipment most commonly used in fine particles processing and the related process parameters is described. Tumbling ball, stirred, vibratory and fluid energy mills are the most commonly used mill types. A number of factors influence the choice of equipment, including the end-use of the product, required product size distribution, sensitivity of the material to heat, and purity requirements. Stirred ball mills are used in ultrafine grinding because of their high unit outputs, while the low amplitude vibro-energy mills are used because of their low specific energy. Fluid energy mills are economic only in some specific applications as in treating heat sensitive materials, materials for plastics and ceramics where purity and delamination are the most important crit...
63 citations
TL;DR: Grinding experiments performed with a modified spiral jet mill indicate the strong impact of the elastic-plastic properties of a given substance on its breaking behaviour and new insights into the size reduction process are given.
54 citations
TL;DR: In this article, the influence of several grinding parameters on the product fineness in jet mill grinding was studied experimentally with a laboratory scale spiral type jet mill, and the most significant variables in the jet mill were feed rate, volumetric flow rate of grinding air and the height of an inside classification tube for grinding at constant pressure.
53 citations
TL;DR: In this article, the authors investigated the grinding performance of FEM through experimental studying and numerical simulation and found that the mean product particle size decreases with grinding pressure and increases with the solid feed rate (SFR).
50 citations
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TL;DR: In Strahlmuhlen, a Randbedingungen fur die Strahlausbildung and Teilchenbewegung were unterstrahlen untersucht as mentioned in this paper, der Einflus der Turbulenz wurde rechnerisch abgeschatzt.
Abstract: Da die Randbedingungen fur die Strahlausbildung und Teilchenbewegung in Strahlmuhlen nicht genugend definiert sind, wurden Einzelstrahlen untersucht. Die Geschwindigkeit von Glasperlen, die von ausen in einen runden Freistrahl eintreten, wurde stroposkopisch gemessen. Aus den Teilchengeschwindigkeiten last sich die Strahlgeschwindigkeit langs der Teilchenbahn errechnen. Das Geschwindigkeitsprofil in Mundungsnahe stimmt ziemlich gut mit den von Kuethe fur wesentlich groseren Strahldurchmesser und kleineren Geschwindigkeiten gemessenen Profilen uberein. Die maximal erreichbare Geschwindigkeit der in der Strahlachse bewegten Teilchen last sich vorausberechnen. Der Einflus der Turbulenz auf die Teilchenbewegung im Strahl wurde rechnerisch abgeschatzt. Die Zerkleinerung in Strahlmuhlen findet vorwiegend in der Nahe der Dusenmundung staff. Mahlungen von Zucker in Strahlmuhlen bestatigen diese Erwartung. Man erkennt wegen der Leuchterscheinungen den Ort der Zerkleinerung.
17 citations
8 citations