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Shearing and Crushing Device for Mixing Powders

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An inexpensive way to reduce granular samples of ash to a fine powder (75–150 μ particle size) has been developed by modifying a device suggested by Dutton. A piece of 20-mil tungsten wire, formed into a spiral in the shape of a cocoon around a frac38;-in. tungsten carbide ball (see Fig. 1), is placed with the sample in a plastic vial with a polyethylene cap and agitated on a mixer mill. The dimensions of the spiral are not critical. It should slide freely inside the vial and should be at least half as long as the vial. Since the plastic containers can withstand only about 20–30 sec of pounding at one time, agitation times should be kept to about 15 sec and the agitation repeated if the sample is not reduced to a powder in that length of time. After use, the ball-spiral device is removed with forceps, washed with a brush in dilute HCl, rinsed in distilled water, and dried and stored in an oven where it is kept ready to use again.

Document Type: Short Communication


Affiliations: 1: The University of Tennessee, Knoxville, Tennessee 2: The University of Tennessee, Knoxville, Tennessee, and Health Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee

Publication date: January 1, 1968

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