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The preparation and assessment of size-graded mineral samples

Published online by Cambridge University Press:  14 March 2018

J. Cartwright
J. Cartwright*
Affiliation:
Safety in Mines Research, Sheffield
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Abstract

Size graded fractions of ground quartz and other silica minerals are prepared by gravity settling for particles greater than 2 microns Stokes' diameter and by centrifugal methods for smaller sizes. The size distributions of the prepared fractions are determined by counting and sizing with an optical microscope or with an electron microscope. The volume-surface diameter ΣND3/ΣND2 is used both for calculating the specific surface of the fractions and for comparing the projected area diameters used in counting, with the Stokes' diameters.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 3 , Issue 15 , October 1956 , pp. 31 - 35
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1956

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References

Brunauer, S., Emmett, P. H. and Teller, E. 1938. J. Amer. Chem. Soc, 60, 309.CrossRefGoogle Scholar
Fair, G. M. and Hatch, L. P. 1933. J. Amer. Wat. Wks. Ass., 25, 1551.Google Scholar