Topic
Jet mill
About: Jet mill is a research topic. Over the lifetime, 803 publications have been published within this topic receiving 5686 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors used isothermal calorimetry to evaluate the effect of the size and shape of the particles obtained from the jet mill grinding process on the extent and rate of hydration as well as their effect on the compressive strength of mortars.
Abstract: While the majority of commercial ordinary portland cement (OPC) is ground using a ball mill or a vertical roller mill, other industries have shown that jet mill grinding can be an alternative approach for grinding materials. This paper investigates the potential application of jet mill grinding for two systems. The first system is a blend of OPC and 15% limestone, and the second system is a blend of OPC and 40% fly ash. It was observed that when jet mill grinding is used, the average particle size of the powders is decreased to approximately 4 μm or less with a narrower particle size distribution than that achieved using ball milling. In addition to evaluating the size and shape of the particles obtained from the jet mill grinding process, this paper focuses on evaluating, using isothermal calorimetry, the effect these changes in particle size and distribution have on the extent and rate of hydration as well as their effect on the compressive strength of cement pastes or mortars. This study also investigated differences between inter-grinding and blending separately ground materials to form an OPC/limestone mixture. Both inter-ground and separately ground OPC/limestone mortars demonstrated an accelerated hydration at early ages accompanied by an increase in early age strength. This appears to be primarily due to the increased surface area of the finer particles that provides more available surface for the hydration reaction. The inter-grinding appeared to be more effective than grinding the materials separately because an improved graded particle size distribution was obtained. The inter-ground OPC/limestone mixture shows accelerated initial hydration at water to powder ratios (w/p, where powder = cement + limestone) of 0.50 and 0.35 when compared with the samples before grinding. At the lower w/p of 0.35, the OPC/limestone mixture appears much more efficient. In the OPC/fly ash mixture, jet mill grinding also accelerates the rate of hydration and strength development.
50 citations
TL;DR: In this paper, a study of talc grinding in an Alpine 100 AFG opposed air jet mill with an inline laser granulometer is presented, where the conditions for steady state operation have been determined from continuous grinding experiments and show that overloading occurs above a critical value of feed rate classifier resulting in unstable product size distribution.
48 citations
Patent•
30 Jun 2006
TL;DR: In this article, a method of milling a powder comprising introducing a gas stream containing a cryogenic liquid and a drug carrier gas into a jet mill, and milling the powder with the jet mill in one or more passes.
Abstract: A method of milling a powder comprising introducing a gas stream containing a cryogenic liquid and a drug carrier gas into a jet mill, and milling a powder with the jet mill in one or more milling passes. A product produced by the method. A milling apparatus comprising a cryogenic gas input system, a powder feeder, a main jet-mill, and at least one output port for collecting the powder.
46 citations
TL;DR: The minimum particle size obtained was 3.15 µm with a span value of 1.30 µm and the circularity value of the ground silica ranged from 1.29 to 2.02 µm as discussed by the authors.
45 citations
TL;DR: In this article, the authors described the preparation of ultrafine particle of insoluble drugs in water and the improvement of physico-chemical properties by using three types of fine grinding mills such as a planetary ball mill, a vibration rod mill, and a jet mill.
43 citations