Powder and Bulk Engineering
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Powder and Bulk Engineering is a technical publication devoted to readers in the bulk solids market, worldwide.
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Publication Date: 06/1991
Pages: 5
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High-speed agitation ball mill: Producing ultrafine powders while using energy efficiently

Producing an ultrafine powder involves intensive grinding and can require large amounts of energy. A high-speed agitation ball mill is one of the most energy-efficient ball mills for producing ultrafine powders. This article explains how an agitation ball mill works and describes variables affecting the mill's efficiency. Other information explains how to overcome problems in producing high-purity, ultrafine powders with a high-speed agitation ball mill.

Ultrafine powders, which have a particle size less than 1 micron [called submicron], can be produced by several types of ball mills. The mills include tumbling, vibratory, planetary [or impact], and high-speed agitation ball mills. These mills provide wet grinding, in which the coarse material's particles are dispersed in a liquid to form a suspension; this typically permits finer grinding than dry methods. However, producing an ultrafine powder with a tumbling, vibratory, or planetary mill can require a long residence time and much energy. The ultrafine powder can also be contaminated by the environment in these mills, and the mills may not be able to handle suspensions with the high solids concentrations that are most suitable for ultrafine grinding.

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