A method for inter-conversion of microtrac and sieve size distributions

The difference in the definition of particle size measured by the Microtrac instrument and by sieving has been investigated. The mean Microtrac size is 1.25 times the mean sieve size for quartz, but a single ▪ screen interval of quartz reports to seven ▪ Microtrac size intervals. Since the Microtrac...

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Bibliographic Details
Published in:Powder technology 1983-01, Vol.35 (2), p.271-278
Main Authors: Austin, L.G., Shah, I.
Format: Article
Language:English
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Summary:The difference in the definition of particle size measured by the Microtrac instrument and by sieving has been investigated. The mean Microtrac size is 1.25 times the mean sieve size for quartz, but a single ▪ screen interval of quartz reports to seven ▪ Microtrac size intervals. Since the Microtrac does not detect material below a lower detection limit and also misses significant amounts above an upper limiting size, there is an ambiguity when the size distribution is normalized within the instrument measurement range. A smooth overlap of uncorrected Microtrac and sieve size distribution can be obtained fortuitously when missed material compensates for the difference in the definition of size. A methodology has been developed for estimating the equivalent sieve size distribution from Microtrac size distribution, provided that the sieve size distribution can be approximated by a suitable mathematical function. The use of the technique on ball mill products which are known to have natural size distributions fitting Rosin—Rammler and Schuhmann forms is illustrated.
ISSN:0032-5910
1873-328X
DOI:10.1016/0032-5910(83)87018-1